CN114406737B - Drill bit clamping mechanism with double limiting functions for machine tool and using method of drill bit clamping mechanism - Google Patents

Abstract

The present invention relates to the field of machine tools. The invention discloses a drill bit clamping mechanism with double limiting functions for a machine tool and a using method thereof, and aims to solve the problems that a drill bit is inconvenient to install, a screw needs to be aligned with a handle of the drill bit to be screwed during installation, and the operation is troublesome. The invention consists of a connecting and fastening mechanism, an extrusion triggering mechanism and a limiting and dismounting mechanism. According to the drill bit clamping mechanism with double limiting and the using method thereof, a user rotates the first internal thread pipe, so that the threaded connection between the central threaded rod and the central thread groove is realized, the bottom surface of the central threaded rod is abutted to the bottom surface of the inner wall of the central thread groove, the threaded connection between the hollow threaded rod and the edge thread groove is realized, and when the threaded connection between the hollow threaded rod and the edge thread groove is realized, the reserved block is moved upwards, the threaded connection between the first internal thread pipe and the side surface of the reserved block is realized again, the fixed block is fixedly connected with the reserved block again, and the installation is simple and convenient.

Description

Drill bit clamping mechanism with double limit for machine tool and using method thereof

technical field

The invention relates to the related fields of machine tools, in particular to a drill bit clamping mechanism with double limits for machine tools and a method for using the same.

Background technique

Drilling refers to the process of leaving a cylindrical hole or hole on the target by means of rotary cutting or rotary extrusion using a tool that is harder and sharper than the target. In the drilling operation of drilling equipment, The setting and use of drill bits is very important. The use of multi-drill bit processing equipment can improve drilling efficiency and is easy to use.

At present, the clamps for clamping the drill bit on the market basically tighten the drill bit and the chuck from the side by screws, and then drive the drill bit to work through the clamp. This structure is very inconvenient for the installation of the drill bit. When installing, the screw must be aligned with the drill bit shank and tightened. If it is not tightened or the position is wrong, slippage will occur during operation.

Contents of the invention

The purpose of the present invention is to provide a drill bit clamping mechanism with double limit for machine tools and its use method, to solve the problem that the device proposed in the background technology is very inconvenient for the installation of the drill bit, and the screw must be aligned with the drill bit handle during installation If it is not tightened or the position is wrong, there will be slippage during operation. In order to achieve the above object, the present invention provides the following technical solutions: a drill clamping mechanism with double limits for machine tools, including a drill body, the top of the drill body is fixedly connected with a reserved block, and the top of the reserved block is There is a central thread groove in the middle;

The edge of the top of the reserved block is provided with an edge thread groove, and the side surface of the inner wall of the edge thread groove is provided with a connecting groove, and the side surface of the inner wall of the connecting groove is slidably connected with an octagonal rod, and the side surface of the octagonal rod A return spring is movably socketed, one end of the return spring is fixedly connected to the side of the octagonal rod, and the other end of the return spring is fixedly connected to the side of the inner wall of the communication groove;

The side of the reserved block is threadedly connected with a connection fastening mechanism, the side of the connection fastening mechanism is movably interspersed with a limited disassembly mechanism, and the top surface of the connection fastening mechanism is fixedly connected with a machine tool body.

Preferably, the connection and fastening mechanism includes a first internally threaded pipe, the first internally threaded pipe is threadedly connected to the side of the reserved block through its inner thread, and the upper side of the first internally threaded pipe is rotatably connected with Rotary tube, the inner side of the first internally threaded tube and the inner side of the rotary tube are respectively fixedly connected with a first inner ring gear and a second inner ring gear;

The upper side of the rotating tube is rotatably connected with a fixed block, and the side of the fixed block is fixedly connected with the side of the machine tool body. Side screw connection on the inner wall of the groove;

The upper side of the side of the central threaded rod is fixedly connected with a reinforcing rib, the side of the reinforcing rib and the side of the central threaded rod are slidingly connected with a central bevel gear, and the lower side of the central bevel gear is fixedly connected with a support spring. The support spring is movably socketed on the side of the central threaded rod, and the lower end of the support spring is fixedly connected to the side of the central threaded rod. A slot is provided on the side of the central threaded rod, and the inner wall of the slot is connected to the octagonal rod. conflict at one end;

The edge of the bottom surface of the fixed block is rotatably connected with a hollow threaded rod, the side of the hollow threaded rod is threadedly connected with the inner wall of the edge thread groove, the side of the hollow threaded rod is fixedly connected with a bearing, and the side of the bearing is connected with the first The inner wall of the internally threaded pipe is fixedly connected, and both ends of the side of the hollow threaded rod are fixedly sleeved with edge bevel gears, and the edge bevel gears on the lower side mesh with the central bevel gear;

An extrusion trigger mechanism is fixedly connected to the lower side of the fixed block, and the side surface of the extrusion trigger mechanism is threadedly connected to the inner side of the hollow threaded rod.

Preferably, the extrusion trigger mechanism includes a spline rod, the top of the spline rod is fixedly connected to the lower side of the fixed block, the side of the spline rod is fixedly and movably sleeved with an externally threaded tube, and the externally threaded tube The side surface of the pipe is threadedly connected with the inner side of the hollow threaded rod, and the side surface of the external threaded pipe interferes with the end of the octagonal rod away from the slot.

Preferably, the position-limiting dismounting mechanism includes an insertion rod, which is movably interspersed with the side of the rotating tube, and a compression spring is movably sleeved on the side of the insertion rod, and one end of the compression spring is fixed to the side of the insertion rod connected, and the other end of the compression spring is fixedly connected to the side of the rotating tube, one end of the insertion rod is lapped with a truncated conical tube, and the truncated conical tube is movably socketed on the side of the central threaded rod, and the truncated conical tube The bottom end is fixedly connected with the top surface of the central bevel gear;

A rubber block is fixedly connected to the side of the plunger, and the side of the rubber block interferes with the inner side of the first inner ring gear and the inner side of the second inner ring gear.

Preferably, the edge of the bottom end of the central threaded rod and the bottom edge of the hollow threaded rod are both chamfered.

Preferably, the end of the octagonal rod away from the central thread groove is an inclined plane, and one end of the octagonal rod interferes with the side of the externally threaded pipe through the inclined plane.

Preferably, one end of the insertion rod is fixedly connected with a pressing plate, the shape of the insertion rod is a right-angled trapezoid, and the cut surface of the side of the insertion rod overlaps the side of the truncated conical tube.

Preferably, the method for using a drill bit clamping mechanism with a double limit for a machine tool includes the following steps:

S1: By inserting the central threaded rod and the hollow threaded rod into the center threaded groove and the edge threaded groove respectively, and then pushing the inserting rod so that one end of the inserting rod moves against the middle of the side of the truncated-conical tube, so that the truncated-conical tube moves down Drive the support spring to compress slightly, so that the side of the rubber block is separated from the sides of the first inner ring gear and the second inner ring gear, and then the user drives the first inner threaded tube to rotate clockwise to drive the edge bevel gear to rotate clockwise, and then passes The clockwise rotation of the edge bevel gear drives the counterclockwise rotation of the center bevel gear, which makes the threaded connection between the central threaded rod and the central threaded groove, and makes the bottom surface of the central threaded rod conflict with the bottom surface of the inner wall of the central threaded groove, and the hollow threaded rod and the edge thread The grooves are threaded, and when the hollow threaded rod and the edge threaded groove are threaded, the reserved block is moved up, and the first internal threaded pipe is screwed with the side of the reserved block again, and the fixed block and the reserved block are screwed again. Re-fix the connection between the remaining blocks;

S2: When the hollow threaded rod and the edge threaded groove are threaded, the hollow threaded rod will drive the external threaded pipe to move up and down on the side of the splined rod when the hollow threaded rod rotates;

S3: When the bottom surface of the central threaded rod collides with the bottom surface of the inner wall of the central threaded groove, then continue to push the plunger so that the plunger touches the side of the truncated conical tube, so that the downward movement of the conical tube drives the support spring to continue to compress, and makes the central cone The gear is separated from the edge bevel gear, and then the user turns the rotary tube, so that the rotary tube and the second inner ring gear cooperate with the edge bevel gear on the upper side to drive the hollow threaded rod to rotate, so that when the hollow threaded rod rotates, it drives the external threaded tube in the spline The side of the rod continues to move down, so that the external threaded tube moves down and squeezes the octagonal rod, so that one end of the octagonal rod is inserted into the card slot, and the card slot is fixed by a second limit, and then loosened to apply force to the insertion rod. The continuous force makes the insert rod drive the side of the rubber block to resist and limit the inner side of the first inner ring gear and the inner side of the second inner ring gear. The bevel gear is clamped to complete the fixing of the main body of the machine tool to the main body of the drill bit.

Compared with prior art, the beneficial effect of the present invention:

In the present invention, through the structural cooperation of the central threaded rod, the hollow threaded rod, the central threaded groove, the edge threaded groove, the plunger, and the truncated conical pipe, by pushing the plunger, one end of the plunger moves to conflict with the middle part of the side of the truncated conical pipe. The side of the rubber block is separated from the sides of the first inner ring gear and the second inner ring gear, and then the user turns the first inner threaded tube to make the threaded connection between the central threaded rod and the central threaded groove, and make the central threaded rod The bottom surface of the inner wall of the central threaded groove is in conflict with the bottom surface of the inner wall of the central threaded groove, and the threaded connection between the hollow threaded rod and the edge threaded groove, and when the threaded connection between the hollow threaded rod and the edge threaded groove, the reserved block is moved up, and the first inner The threaded pipe and the side of the reserved block are threaded again, and the fixed block and the reserved block are fixedly connected again, and the installation is simple, convenient and stable.

In the present invention, when the bottom surface of the central threaded rod conflicts with the bottom surface of the inner wall of the central threaded groove, then continue to push the insertion rod against the side of the truncated conical tube, so that the truncated conical tube drives the central bevel gear to separate from the edge bevel gear, and then the user Turn the rotating tube so that the second inner ring gear cooperates with the edge bevel gear on the upper side to drive the hollow threaded rod to rotate, so that when the hollow threaded rod rotates, it will drive the external threaded tube to continue to move down on the side of the spline rod, so that the external threaded tube will move down Squeeze the octagonal rod so that one end of the octagonal rod is inserted into the card slot, and fix the card slot with a secondary limit, further strengthening the stability of the connection between the main body of the machine tool and the main body of the drill bit.

In the present invention, by releasing the continuous force applied to the plunger, the plunger drives the side of the rubber block to conflict with the inner side of the first inner ring gear and the inner side of the second inner ring gear. Under the action, the center bevel gear is clamped with the edge bevel gear, completing the fixation of the machine tool body to the drill bit body, preventing the rotation of the first inner ring gear, and ensuring the stability of the connection between the machine tool body and the drill bit body.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is a partial three-dimensional structure sectional view of the present invention;

Fig. 3 is a partial three-dimensional structure sectional view of the present invention;

Fig. 4 is the partial three-dimensional structure schematic diagram of the present invention;

Fig. 5 is a sectional view of a partial three-dimensional structure of the present invention.

In the figure: 1. Drill body; 2. Reserved block; 3. Central thread groove; 4. Edge thread groove; 5. Connecting groove; 6. Octagonal rod; 7. Return spring; 8. Connection fastening mechanism; 801, the first internal thread pipe; 802, the rotating pipe; 803, the first inner ring gear; 804, the second inner ring gear; 805, the fixed block; 806, the central threaded rod; 807, the reinforcing rib; 808, the central bevel gear ; 809, support spring; 810, draw-in groove; 811, hollow threaded rod; 812, bearing; 94. Rubber block; 10. Machine tool main body; 11. Squeeze trigger mechanism; 111. Spline rod; 112. External thread pipe.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to Fig. 1 to Fig. 5, the present invention provides a technical solution: a drill bit clamping mechanism with double limit for machine tools, including a drill bit main body 1, a reserved block 2 is fixedly connected to the top of the drill bit main body 1, reserved The middle part of the top of the block 2 is provided with a central thread groove 3;

The edge of the top of the reserved block 2 is provided with an edge thread groove 4, and the side of the inner wall of the edge thread groove 4 is provided with a connecting groove 5, and the side of the inner wall of the connecting groove 5 is slidingly connected with an octagonal rod 6, and the side of the octagonal rod 6 is movable. A return spring 7 is sleeved, one end of the return spring 7 is fixedly connected to the side of the octagonal rod 6, and the other end of the return spring 7 is fixedly connected to the side of the inner wall of the communication groove 5;

The side of the reserved block 2 is threadedly connected with a connecting fastening mechanism 8 , the side of the connecting fastening mechanism 8 is movably interspersed with a limited dismounting mechanism 9 , and the top surface of the connecting fastening mechanism 8 is fixedly connected with a machine tool main body 10 .

In this embodiment, as shown in Fig. 1, Fig. 3, Fig. 4, and Fig. 5, the connecting fastening mechanism 8 includes a first internally threaded pipe 801, and the first internally threaded pipe 801 connects with the thread of the reserved block 2 through its inner thread. The side is threadedly connected, the upper side of the first internally threaded pipe 801 is rotatably connected with a rotating pipe 802, and the inside of the first internally threaded pipe 801 and the inside of the rotating pipe 802 are respectively fixedly connected with a first inner ring gear 803 and a second inner ring gear 804 ;

The upper side of the rotating tube 802 is rotatably connected with a fixed block 805, and the side of the fixed block 805 is fixedly connected with the side of the machine tool body 10. It is threadedly connected with the side of the inner wall of the central thread groove 3;

The upper side of the central threaded rod 806 side is fixedly connected with a reinforcing rib 807, and the side of the reinforcing rib 807 is slidingly connected with a central bevel gear 808 with the side of the central threaded rod 806, and the lower side of the central bevel gear 808 is fixedly connected with a support spring 809 to support The spring 809 is movably socketed on the side of the central threaded rod 806, and the lower end of the support spring 809 is fixedly connected with the side of the central threaded rod 806, and the side of the central threaded rod 806 is provided with a draw-in groove 810, and the inner wall of the draw-in groove 810 is in contact with eight One end of the side bar 6 is in conflict;

The edge of the fixed block 805 bottom surface is rotatably connected with a hollow threaded rod 811, the side of the hollow threaded rod 811 is threaded with the inner wall of the edge thread groove 4, the side of the hollow threaded rod 811 is fixedly connected with a bearing 812, and the side of the bearing 812 is connected with the first The inner wall of an internally threaded pipe 801 is fixedly connected, and both ends of the side of the hollow threaded rod 811 are fixedly sleeved with an edge bevel gear 813, and the edge bevel gear 813 on the lower side meshes with the center bevel gear 808;

The lower side of the fixed block 805 is fixedly connected with the extrusion trigger mechanism 11 , and the side surface of the extrusion trigger mechanism 11 is threadedly connected with the inner side of the hollow threaded rod 811 .

In this embodiment, as shown in Figure 4 and Figure 5, the extrusion trigger mechanism 11 includes a spline rod 111, the top of the spline rod 111 is fixedly connected to the lower side of the fixed block 805, and the side of the spline rod 111 is fixed to the movable sleeve. An externally threaded pipe 112 is connected, and the side surface of the externally threaded pipe 112 is threadedly connected with the inner side of the hollow threaded rod 811 , and the side surface of the externally threaded pipe 112 interferes with the end of the octagonal rod 6 away from the engaging groove 810 .

In this embodiment, as shown in Fig. 1, Fig. 3 and Fig. 4, the limit dismounting mechanism 9 includes an insertion rod 91, which is movably interspersed with the side of the rotary tube 802, and the side of the insertion rod 91 is movably sleeved with a compression spring 92, one end of stage clip 92 is fixedly connected with the side of inserting rod 91, and the other end of stage clip 92 is fixedly connected with the side of rotating tube 802, and one end of inserting rod 91 is overlapped with conical tube 93, and conical tube 93 is movable Socketed on the side of the central threaded rod 806, and the bottom end of the conical tube 93 is fixedly connected to the top surface of the central bevel gear 808;

A rubber block 94 is fixedly connected to the side of the insertion rod 91 , and the side of the rubber block 94 interferes with the inner side of the first inner ring gear 803 and the inner side of the second inner ring gear 804 .

In this embodiment, as shown in Fig. 3, Fig. 4, and Fig. 5, the edge of the central threaded rod 806 bottom and the edge of the bottom surface of the hollow threaded rod 811 are all chamfered to ensure that the central threaded rod 806 and the bottom surface of the hollow threaded rod 811 can be compared. Stably inserted into the central threaded groove 3 and the edge threaded groove 4 respectively, to facilitate the subsequent connection between the central threaded rod 806 and the central threaded groove 3 , and the connection between the hollow threaded rod 811 and the edge threaded groove 4 .

In this embodiment, as shown in Fig. 2, Fig. 3 and Fig. 5, the end of the octagonal rod 6 away from the central threaded groove 3 is a bevel, and one end of the octagonal rod 6 is in conflict with the side of the externally threaded pipe 112 through the bevel , to ensure that one end of the octagonal rod 6 can be stably pushed to engage with the inner wall of the slot 810 when the externally threaded pipe 112 moves down.

In this embodiment, as shown in Figure 4, one end of the insertion rod 91 is fixedly connected with a pressing plate, the shape of the insertion rod 91 is a right-angled trapezoid, and the cut surface on the side of the insertion rod 91 overlaps with the side of the conical tube 93 to ensure that the insertion rod When one end of 91 moves, it can stably drive the frustoconical tube 93 to move down.

The use method and advantages of the present invention: the use method of the drill bit clamping mechanism with double limit for this kind of machine tool, the working process is as follows:

As shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5:

S1: By inserting the central threaded rod 806 and the hollow threaded rod 811 into the center threaded groove 3 and the edge threaded groove 4 respectively, and then pushing the inserting rod 91 so that one end of the inserting rod 91 moves and interferes with the middle part of the side of the frustum-shaped tube 93 , so that the frustum-shaped tube 93 moves down to drive the support spring 809 to slightly compress, so that the side of the rubber block 94 is separated from the sides of the first inner ring gear 803 and the second inner ring gear 804, and then the user pushes the first inner threaded tube 801 Clockwise rotation drives the edge bevel gear 813 to rotate clockwise, and then the clockwise rotation of the edge bevel gear 813 drives the center bevel gear 808 to rotate counterclockwise, so that the threaded connection between the center threaded rod 806 and the center thread groove 3 makes the center thread The bottom surface of the rod 806 is in conflict with the bottom surface of the inner wall of the central threaded groove 3, the hollow threaded rod 811 is threadedly connected with the edge threaded groove 4, and when the hollow threaded rod 811 is threaded with the edge threaded groove 4, the reserved block 2 Move up, and make the first internal thread pipe 801 and the side of the reserved block 2 threaded again, and fix the connection between the fixed block 805 and the reserved block 2 again;

S2: and when the hollow threaded rod 811 is threadedly connected with the edge threaded groove 4, the hollow threaded rod 811 drives the external threaded pipe 112 to move up and down on the side of the splined rod 111 when the hollow threaded rod 811 rotates;

S3: When the bottom surface of the central threaded rod 806 collides with the bottom surface of the inner wall of the central threaded groove 3, then continue to push the insertion rod 91, so that the insertion rod 91 touches the side of the truncated conical tube 93, so that the truncated conical tube 93 moves down to drive the support spring 809 Continue to compress, and separate the central bevel gear 808 from the edge bevel gear 813, and then the user rotates the rotating tube 802, so that the rotating tube 802 and the second inner ring gear 804 cooperate with the edge bevel gear 813 on the upper side to drive the hollow threaded rod 811 to rotate , so that when the hollow threaded rod 811 rotates, it drives the externally threaded pipe 112 to continue to move down on the side of the splined rod 111, so that the externally threaded pipe 112 moves down to squeeze the octagonal rod 6, so that one end of the octagonal rod 6 is inserted into the card In the slot 810, carry out the second limit and fix the card slot 810, and then loosen the continuous force applied to the insertion rod 91, so that the insertion rod 91 drives the side of the rubber block 94 and the inner side of the first inner ring gear 803, the second The inner side of the inner ring gear 804 is in conflict and limited. At this time, under the reset force of the support spring 809, the center bevel gear 808 is engaged with the edge bevel gear 813, and the fixation of the machine tool body 10 to the drill body 1 is completed.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and those described in the above-mentioned embodiments and description are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. A drill clamping mechanism with double limits for machine tools, comprising a drill body (1), characterized in that: the top of the drill body (1) is fixedly connected with a reserved block (2), and the reserved A central threaded groove (3) is provided in the middle of the top of the block (2); The edge of the top of the reserved block (2) is provided with an edge thread groove (4), and the side of the inner wall of the edge thread groove (4) is provided with a communication groove (5), and the side of the inner wall of the communication groove (5) slides An octagonal rod (6) is connected, and a return spring (7) is movably sleeved on the side of the octagonal rod (6), and one end of the return spring (7) is connected to the side surface of the octagonal rod (6). It is fixedly connected, and the other end of the return spring (7) is fixedly connected with the side of the inner wall of the communication groove (5); The side of the reserved block (2) is threadedly connected with a connection fastening mechanism (8), and the side of the connection fastening mechanism (8) is movably interspersed with a limited disassembly mechanism (9), and the connection fastening mechanism (8) ) is fixedly connected with the machine tool main body (10); The connection fastening mechanism (8) includes a first internally threaded pipe (801), and the first internally threaded pipe (801) is threadedly connected to the side surface of the reserved block (2) through the inner thread of the first internally threaded pipe (801). The upper side of the inner threaded pipe (801) is rotatably connected with a rotating pipe (802), and the inner side of the first inner threaded pipe (801) and the inner side of the rotating pipe (802) are respectively fixedly connected with a first inner ring gear (803) and the second inner ring gear (804); The upper side of the rotating tube (802) is rotatably connected with a fixed block (805), and the side of the fixed block (805) is fixedly connected with the side of the machine tool body (10), and the middle part of the lower side of the fixed block (805) rotates A central threaded rod (806) is connected, and the side of the central threaded rod (806) is threadedly connected to the side of the inner wall of the central threaded groove (3); The upper side of the side of the central threaded rod (806) is fixedly connected with a reinforcing rib (807), and the side of the reinforcing rib (807) is slidingly connected with the side of the central threaded rod (806) with a central bevel gear (808). The lower side of the central bevel gear (808) is fixedly connected with a support spring (809), and the support spring (809) is movably socketed on the side of the central threaded rod (806), and the lower end of the support spring (809) is in contact with the center The side of the threaded rod (806) is fixedly connected, and the side of the central threaded rod (806) is provided with a card slot (810), and the inner wall of the card slot (810) conflicts with one end of the octagonal rod (6); The edge of the bottom surface of the fixed block (805) is rotatably connected with a hollow threaded rod (811), the side of the hollow threaded rod (811) is threaded with the inner wall of the edge threaded groove (4), and the hollow threaded rod (811 ) side is fixedly connected with a bearing (812), and the side of the bearing (812) is fixedly connected with the inner wall of the first internally threaded pipe (801), and both ends of the side of the hollow threaded rod (811) are fixedly sleeved with edge bevel gear (813), and the edge bevel gear (813) on the lower side meshes with the central bevel gear (808); The lower side of the fixed block (805) is fixedly connected with an extrusion trigger mechanism (11), and the side of the extrusion trigger mechanism (11) is threadedly connected with the inner side of the hollow threaded rod (811); The extrusion trigger mechanism (11) includes a splined rod (111), the top of the splined rod (111) is fixedly connected to the lower side of the fixed block (805), and the side of the splined rod (111) is fixed An externally threaded pipe (112) is movable sleeved, and the side of the externally threaded pipe (112) is threadedly connected with the inner side of the hollow threaded rod (811), and the side of the externally threaded pipe (112) is connected with the octagonal rod (6) The end far away from the card slot (810) is in conflict; The position-limiting dismounting mechanism (9) includes an insertion rod (91), the insertion rod (91) is movably interspersed with the side of the rotating tube (802), and the side of the insertion rod (91) is movably sleeved with a compression spring ( 92), one end of the stage clip (92) is fixedly connected to the side of the insertion rod (91), and the other end of the stage clip (92) is fixedly connected to the side of the rotary tube (802), and the insertion rod (91) One end of the truncated tube (93) is overlapped, and the truncated tube (93) is movably socketed on the side of the central threaded rod (806), and the bottom end of the truncated tube (93) is connected to the central bevel gear (808 ) is fixedly connected to the top surface; A rubber block (94) is fixedly connected to the side of the insertion rod (91), and the side of the rubber block (94) interferes with the inner side of the first inner ring gear (803) and the inner side of the second inner ring gear (804). 2. The drill bit clamping mechanism with double limit for a kind of machine tool according to claim 1, characterized in that: the edge of the bottom end of the central threaded rod (806) and the edge of the bottom surface of the hollow threaded rod (811) are cut Corner treatment. 3. The drill clamping mechanism with double limit for machine tools according to claim 1, characterized in that: the end of the octagonal rod (6) away from the central threaded groove (3) is an inclined plane, and the eight One end of the side bar (6) interferes with the side of the externally threaded pipe (112) through the inclined surface. 4. A kind of drill clamping mechanism with double limit for machine tools according to claim 1, characterized in that: one end of the insertion rod (91) is fixedly connected with a pressing plate, and the shape of the insertion rod (91) It is a right-angled trapezoid, and the cut surface on the side of the insertion rod (91) overlaps the side of the truncated tube (93). 5. a kind of machine tool according to claim 1 has the use method of the drill bit clamping mechanism of double limit, comprises the following steps: S1: Insert the central threaded rod (806) and the hollow threaded rod (811) into the center threaded groove (3) and the edge threaded groove (4) respectively, and then push the insertion rod (91) so that the insertion rod (91) The movement of one end of the cone-shaped tube (93) conflicts with the middle part of the side of the cone-shaped tube (93), so that the downward movement of the cone-shaped tube (93) drives the support spring (809) to compress slightly, so that the side of the rubber block (94) is in contact with the first inner ring gear (803 ) and the side of the second inner ring gear (804), and then the user promotes the first inner thread tube (801) to rotate clockwise to drive the edge bevel gear (813) to rotate clockwise, and then through the edge bevel gear (813) clockwise The rotation drives the central bevel gear (808) to rotate counterclockwise, so that the thread connection between the central threaded rod (806) and the central threaded groove (3) is made, and the bottom surface of the central threaded rod (806) is connected to the inner wall of the central threaded groove (3). The bottom surface of the hollow threaded rod (811) is threadedly connected with the edge threaded groove (4), and when the hollow threaded rod (811) is threadedly connected with the edge threaded groove (4), the reserved block (2) Move up, and make the first internal thread pipe (801) and the side of the reserved block (2) threaded again, and fix the connection between the fixed block (805) and the reserved block (2) again; S2: And when the threaded connection between the hollow threaded rod (811) and the edge threaded groove (4), the hollow threaded rod (811) drives the external threaded pipe (112) to move up and down on the side of the splined rod (111) when the hollow threaded rod (811) rotates ; S3: When the bottom surface of the central threaded rod (806) is in contact with the bottom surface of the inner wall of the central threaded groove (3), then continue to push the insertion rod (91), so that the insertion rod (91) is in contact with the side of the cone-shaped tube (93), so that The frustum-shaped tube (93) moves down to drive the support spring (809) to continue to compress, and makes the central bevel gear (808) separate from the edge bevel gear (813), and then the user turns the rotary tube (802) again, so that the rotary tube (802) ) and the second inner ring gear (804) cooperate with the edge bevel gear (813) on the upper side to drive the hollow threaded rod (811) to rotate, so that when the hollow threaded rod (811) rotates, it drives the external threaded pipe (112) on the spline rod ( 111) continues to move down on the side, so that the externally threaded pipe (112) moves down to squeeze the octagonal rod (6), so that one end of the octagonal rod (6) is inserted into the draw-in groove (810), and the draw-in groove ( 810) carry out the secondary limit fixation, then loosen the continuous power applied to the insertion rod (91), impel the insertion rod (91) to drive the side of the rubber block (94) and the inner side of the first inner ring gear (803), The inner side of the second inner ring gear (804) conflicts and limits. At this time, under the action of the restoring force of the support spring (809), the center bevel gear (808) is engaged with the edge bevel gear (813) to complete the main body of the machine tool (10 ) to the fixing of the drill body (1).

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