JP4621587B2 - Clamping device - Google Patents

Description

  The present invention relates to a clamping device for clamping a rod-shaped member such as a wire or a pipe.

  2. Description of the Related Art Conventionally, in an inspection system for inspecting a rod-shaped workpiece such as a wire or a pipe, an apparatus for clamping a workpiece which is an inspected product and inserting the workpiece into an inspection device is used. In this apparatus, for example, rods of a plurality of cylinders are pushed out by a hydraulic pump, and a workpiece is mechanically clamped by a plurality of chuck claws provided at the tips of the rods (see, for example, Patent Document 1).

However, such an apparatus has a problem that the structure is complicated and expensive, and the force for fixing the work is small.
Japanese Patent Laid-Open No. 8-150531

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a clamping device that strongly clamps a rod-shaped member such as a wire or a pipe with a small force.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a clamping device for clamping a rod-shaped member, wherein a cylindrical body in which an insertion portion through which the rod-shaped member is inserted is formed at a central portion, A moving member provided so as to be movable in the axial direction of the cylindrical body, a first cylinder provided on a protruding portion protruding from a peripheral surface of the cylindrical body, and an end portion of a first piston rod of the first cylinder A flange portion formed on the movable member, an annular groove that engages with the flange portion to advance and retract the first piston rod, and is connected to the first cylinder, and allows fluid to flow from the first cylinder. A connecting pipe that is moved to the outside, a second cylinder that is provided in an annular part that extends from the protruding part, and is attached to a tip of a second piston rod of the second cylinder; Flow moving through a connecting pipe It is characterized by having a fixing claw for gripping the rod-like member by advancing and retracting operation of the second piston rod to advance and retreat in the direction of the rod-like member by.

  According to invention of Claim 1, a rod-shaped member is inserted in the insertion part of a cylindrical body, and the moving member provided in the cylindrical body is moved to the direction of a protrusion part. The projecting portion of the cylindrical body is provided with a first cylinder, and the first piston is engaged by engaging a flange portion formed at the end of the first piston rod with an annular groove formed in the moving member. The rod advances in the direction of the protrusion. Thereby, the fluid inside the first cylinder moves to the connecting pipe connected to the first cylinder. A second cylinder is provided in the annular portion extending from the protrusion, and the fluid moves from the first cylinder through the connecting pipe to the inside of the second cylinder, so that the second piston rod moves in the direction of the rod-shaped member. Advance to. Thereby, the fixed claw attached to the tip of the second piston rod advances in the direction of the rod-shaped member, and the rod-shaped member is gripped by the fixed claw. For this reason, a rod-shaped member can be clamped (gripped) strongly with a small force.

  Moreover, when removing the clamp of a rod-shaped member, a moving member is moved to a reverse direction with a protrusion part. As a result, the first piston rod having the flange portion engaged with the annular groove of the moving member moves in the direction opposite to the projecting portion, the fluid in the first cylinder is pulled, and the fluid in the second cylinder passes through the connecting pipe. Pulled to move to the first cylinder. Thereby, a 2nd piston rod moves to a reverse direction with a rod-shaped member, and the clamp of the rod-shaped member by a fixed nail | claw is cancelled | released.

  According to a second aspect of the present invention, in the clamping device according to the first aspect, three of the fixing claws are provided at equal intervals in the circumferential direction of the annular portion.

  According to the invention described in claim 2, since the three fixing claws are provided at equal intervals in the circumferential direction of the annular portion, it becomes possible to stably hold the rod-shaped member with the three fixing claws, The rod-shaped member can be strongly fixed.

  A third aspect of the present invention is the clamping device according to the first or second aspect, wherein the moving member is a nut that is screwed into a threaded portion of a circumferential surface of the cylindrical body made of a cylinder. It is characterized by.

  According to the invention described in claim 3, the first piston rod moves in the direction of the projecting portion by tightening the nut screwed into the threaded portion of the peripheral surface of the cylindrical body in the direction of the projecting portion, The fluid in one cylinder is pushed out to the connecting pipe. Thereby, a rod-shaped member is gripped by a plurality of fixed claws. Further, when releasing the clamp of the rod-shaped member, the first piston rod moves in the direction opposite to the projecting portion by turning the nut to the opposite side to the projecting portion so that the first piston rod moves in the second cylinder. The fluid is pulled and moves to the first cylinder. As a result, the rod-like member can be clamped and released by a simple operation.

  Since the clamping device according to the present invention is configured as described above, it is possible to strongly clamp the rod-shaped member with a small force and to reduce the device cost.

  Embodiments of the joint of the present invention will be described below with reference to the drawings.

  FIG. 1 is a half-cut sectional view showing a first embodiment of a clamping device 10 of the present invention. FIG. 2 is a cross-sectional view of the vicinity of the fixing claw of the clamp device 10.

  The clamp device 10 is used when the wire 40 is clamped and inserted into an inspection device in an inspection system for inspecting the wire 40 which is an inspected product.

  As shown in FIG. 1, the clamp device 10 is provided with a cylindrical body 12 having an insertion portion 12A through which a wire 40 as a rod-like member is inserted in the vicinity of the center portion. A male screw 14 is formed on the peripheral surface of the cylindrical body 12, and a nut 16 as a moving member is screwed to the male screw 14 so as to be movable in the axial direction of the cylindrical body 12. . A projecting portion 18 projects radially from the peripheral surface of the cylindrical body 12, and a support member 20 is attached to the cylindrical body 12 so as to be adjacent to the projecting portion 18. The cylinder portion of the first cylinder 22 is fixed to the support member 20, and the support member 20 is positioned and fixed to the cylindrical body 12 by a retaining ring 24.

  A first piston rod 22A is provided in the first cylinder 22 so as to be able to advance and retreat, and a flange portion 22B is formed at an end of the first piston rod 22A. The nut 16 is formed with an annular groove 16A through which the first piston rod 22A is inserted and the flange portion 22B is slidably engaged. When the nut 16 rotates, the annular groove 16A rotates in the circumferential direction while sliding with the flange portion 22B, and the flange portion 22B engaged with the annular groove 16 does not rotate in the circumferential direction. When the nut 16 advances and retreats in the axial direction of the cylindrical body 12, the first piston rod 22A advances and retreats by the flange portion 22B engaged with the annular groove 16A.

  The first cylinder 22 is filled with a fluid 26 that moves as the first piston rod 22A advances and retreats. Connected to the first cylinder 22 is a connecting pipe 28 through which the fluid 26 can move from the first cylinder 22. On the outer diameter side of the projecting portion 18, an annular portion 30 is extended on the opposite side of the nut 16, and the annular portion 30 has a larger diameter than the cylindrical body 12.

  As shown in FIGS. 1 and 2, the cylinder portions of the three second cylinders 32 are fixedly supported on the inner peripheral surface of the annular portion 30 at substantially equal intervals in the circumferential direction. Each second cylinder 32 is provided with a second piston rod 32A so as to be able to advance and retreat, and a fixing claw 34 for holding the wire 40 is attached to an end of the second piston rod 32A. On the surface of the fixed claw 34, a plurality of claw portions 34A for gripping the wire 40 are formed. As shown in FIG. 2, the wire 40 is configured to be held by three fixed claws 34.

  As shown in FIG. 1, the second cylinder 32 is filled with a fluid 26 for moving the second piston rod 32 </ b> A forward and backward. The connecting pipe 28 connected to the first cylinder 22 passes through a notch (not shown) provided in the middle of the projecting portion 18, and the other end of the connecting pipe 28 is connected to the second cylinder 32. ing. The first cylinder 22 and the second cylinder 32 communicate with each other via a connecting pipe 28, and the fluid 26 can move between the first cylinder 22 and the second cylinder 32 through the connecting pipe 28.

  As the fluid 26, a liquid, a fluid having a high viscosity, or the like can be used. For example, as the fluid 26, silicone oil, mineral hydraulic oil, grease, or the like is used. The cylindrical body 12 is made of metal such as stainless steel, but is not necessarily limited to metal, and may be made of plastic, for example. In addition, as the wire 40, resin, metal, etc. are used.

  Next, the operation of the clamping device 10 will be described.

  As shown in FIGS. 1 and 2, when the wire 40 is clamped by the clamping device 10, the user inserts the wire 40 into the insertion portion 12 </ b> A of the cylindrical body 12. Then, the nut 16 is tightened in the direction of the protruding portion 18 (arrow A direction). Thereby, as shown in FIG. 3, the first piston rod 22 </ b> A having the flange portion 22 </ b> B engaged with the annular groove 16 </ b> A of the nut 16 advances in the direction of the protruding portion 18. As the first piston rod 22 </ b> A advances, the fluid 26 in the first cylinder 22 is pushed out to the connecting pipe 28, and the fluid 26 moves into the second cylinder 32 through the connecting pipe 28.

  As shown in FIGS. 2 and 4, when the fluid 26 moves into the second cylinder 32, the second piston rod 32 </ b> A advances in the direction of the wire 40. And the fixed claw 34 attached to the front-end | tip of the 2nd piston rod 32A moves to the arrow B direction (refer FIG. 1), and the wire 40 is hold | gripped when the some claw part 34A presses the wire 40. FIG.

  In this clamping device 10, three first cylinders 22 and second cylinders 32 are provided on the cylindrical body 12, and three fixing claws 34 advance simultaneously by the movement operation of the nut 16. For this reason, the wire 40 is stably hold | gripped by the three fixed claws 34, and the wire 40 can be firmly hold | maintained with little force.

  Further, when removing the clamp of the wire 40 by the fixing claw 34, the user moves the nut 16 in the direction opposite to the protruding portion 18. As a result, the first piston rod 22A having the flange portion 22B that engages with the annular groove 16A of the nut 16 moves (retreats) to the side opposite to the protruding portion 18, and the fluid 26 in the first cylinder 22 is pulled. Then, the fluid 26 in the second cylinder 32 is pulled through the connecting pipe 28, and the fluid 26 moves into the first cylinder 22. As a result, the second piston rod 32A moves (retreats) in the direction away from the wire 40, and the fixed claw 34 retreats. By the movement operation of the nut 16, the three fixing claws 34 are simultaneously retracted, and the gripping of the wire 40 is released.

  Such a clamping device 10 can clamp and unclamp the wire 40 by a simple operation of moving the nut 16. Moreover, since the wire 40 is clamped by the three fixing claws 34, the clamp of the wire 40 is stabilized, and the wire 40 can be strongly clamped with a small force.

  In the above-described embodiment, the three first cylinders 22 and the three second cylinders 32 are provided and connected by the connecting pipe 28, but the present invention is not limited to this configuration. For example, a configuration may be adopted in which one first cylinder and three second cylinders are provided and connected from one first cylinder to three second cylinders by connecting pipes.

  In the above-described embodiment, the wire 40 is clamped using the three fixed claws 34. However, the present invention is not limited to this configuration, and the number of fixed claws (the number of second cylinders) can be set as appropriate.

  In addition, in the said embodiment, although the circular wire 40 was used as a rod-shaped member, it is not limited to this structure, You may use a cylindrical pipe. Further, the present invention can be applied even when a polygonal rod-like member other than a circle is clamped.

It is a half cut sectional view showing the clamp device of a 1st embodiment of the present invention. It is sectional drawing in the direction orthogonal to the axial direction of the annular part of the clamp apparatus shown in FIG. It is a half-cut sectional view which shows the state which clamped the wire using the clamp apparatus shown in FIG. It is sectional drawing in the direction orthogonal to the axial direction of the annular part of the clamp apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Clamp apparatus 12 Cylindrical body 12A Insertion part 14 Male screw 16 Nut (moving member)
16A annular groove 18 projecting portion 20 support member 22 first cylinder 22A first piston rod 22B flange portion 26 fluid 28 connecting tube 30 annular portion 32 second cylinder 32A second piston rod 34 fixing claw 34A claw portion 40 wire (bar-shaped member)

Claims (3)

A clamping device for clamping a rod-shaped member,
A cylindrical body in which an insertion part through which the rod-like member is inserted is formed in the center part,
A moving member provided movably in the axial direction of the cylindrical body;
A first cylinder provided on a protruding portion protruding from the peripheral surface of the cylindrical body;
A brim portion formed at the end of the first piston rod of the first cylinder;
An annular groove formed in the moving member and engaged with the collar portion to advance and retract the first piston rod;
A connecting pipe connected to the first cylinder and moving fluid from the first cylinder to the outside;
A second cylinder provided in an annular portion extending from the protruding portion, to which the connecting pipe is connected;
A fixed claw that is attached to the tip of the second piston rod of the second cylinder and that grips the rod-like member by advancing and retreating operation of the second piston rod that moves forward and backward in the direction of the rod-like member by a fluid moving through the connecting pipe;
A clamping device comprising:   The clamping device according to claim 1, wherein three fixing claws are provided at equal intervals in a circumferential direction of the annular portion.   The clamping device according to claim 1 or 2, wherein the moving member is a nut that is screwed into a screw portion of a peripheral surface of the cylindrical body made of a cylinder.

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