TWI458588B - Small machine tool structure - Google Patents

Description

Small machine tool structure

The invention relates to a machine tool structure, in particular to a small machine tool structure.

A machine tool is a powered mechanical device that is typically used to precisely cut metal to produce other machines or machined metal parts. In order to machine the workpiece, the machine tool produces a relative movement between the workpiece and the tool, which in turn can be divided into a main motion and a feed motion, with which the workpiece is machined. The general machine tool is mainly divided into two types: fixed machine tool and hand tool machine. The main difference is that the fixed machine tool is relatively large in size. The working mode is to process the workpiece to the machine tool. The machine tool itself is fixed. On the work surface or work area, and reliable machine tool body stand; and the hand-held power tool is relatively small, its working mode is to take the machine tool to the processing part, can be hand-held or supported by hand or suspended / installed The tool is attached to the stand and can be easily carried to the workplace.

With the development of technology, the items used are also moving toward light, thin, short and small, and the technology required for processing is becoming more and more sophisticated. The hand-held tool processing method is taken as an example, and the hand-held type used is used. The machine tool must also be smaller and easier to operate in response to the trend of the times. At present, the hand-held power tool uses a mandrel having two end plates for erecting and connecting with the tool head, such as the Patent No. M323163 of the Republic of China, which discloses a motor mainly comprising a casing group, a rotor group and a certain subgroup. , a fan group and a plurality of heat pipes. Wherein, the rotor group axis protrudes from the front of the casing group The rear end plate extends outside and the stator assembly is disposed at an inner edge of the casing group, and a current is generated by the current through the stator assembly to provide a rotor for driving the rotor. However, in this design, the axial center of the front and rear plates is used, and the space of the two end plates is required, so that the scope of the reduction of the size of the machine tool is limited, and the design is designed to increase the power output, the front and rear ends. The larger the size of the ball bearing is installed in the corresponding plate, the volume of the machine tool also increases, and it is unable to conform to the trend of light, thin, short and small.

The main object of the present invention is to solve the problem that the conventional machine tool cannot be reduced in size due to the limitation of the front and rear plates.

In order to achieve the above object, the present invention provides a small machine tool structure including a hollow outer casing, a fixing base disposed in the hollow outer casing, and a driving structure connected to the fixing base, wherein the hollow outer casing has a fixing portion And a through hole provided in the hollow casing and provided by a tool head, the fixing base includes a connecting portion connected to the fixing portion, and a hollow shaft portion coaxially disposed with the through hole, the hollow shaft portion An auxiliary support member and at least one auxiliary rotating member are included. The driving structure comprises a stator portion which is provided with the hollow shaft portion and generates a magnetic force after being energized, a rotor portion which is disposed opposite to the outside of the stator portion and is driven to rotate by the magnetic force, and a connecting portion of the rotor portion and the two ends respectively The tool head coaxially penetrates the hollow shaft portion, the auxiliary support member and the spindle of the auxiliary rotating member, and the spindle is interlocked by the rotor portion to drive the tool head to rotate.

Further, the stator portion is electrically connected to a power source having a control circuit for outputting a power to the stator portion and a power line connecting the control circuit and the stator portion.

Further, the connecting portion has a line groove for receiving the power line.

Further, the control circuit is disposed in the hollow housing.

Further, the rotor portion has a plurality of clamping portions that sandwich the mandrel.

Further, the hollow shaft portion has a partition, and the hollow shaft portion is divided by the partition plate with a first accommodating space for accommodating the auxiliary support member and a first accommodating space for communicating with the at least one auxiliary a second accommodating space of the rotating member.

Further, the auxiliary support member and the auxiliary rotating member are ball bearings.

The beneficial effects of the invention are:

1. The machine tool of the present invention is different from the conventional tool machine by the limitation of the front and rear end plates. The present invention matches the rotor portion and the stator portion with a single fixing seat, and sets a mandrel to connect one end of the mandrel with the rotor portion, and One end of the auxiliary support member is supported by the auxiliary support member, and after the stator portion is energized, the rotor portion is driven to rotate, and the rotor portion is coupled to the mandrel to generate a stable rotation. This saves the space required for the rear-end board setup and greatly increases the size of the machine tool.

2. In addition, the conventional machine tool must increase the size of the ball bearing or increase the number of ball bearings to both ends of the mandrel to withstand the large rotating force, but the size of the machine tool will also be It will increase. The invention is designed according to the above structure, and more than one auxiliary rotating member is placed in the second space, and the auxiliary rotating member is added in the existing space, and no additional space is needed to accommodate the newly added auxiliary rotating member, and the auxiliary is added. The number of rotating members does not require an increase in the size of the auxiliary rotating member to increase the volume of the machine tool.

1‧‧‧ hollow shell

11‧‧‧Fixed Department

12‧‧‧through hole

2‧‧‧ Fixed seat

21‧‧‧Connecting Department

211‧‧‧Line groove

22‧‧‧ hollow shaft

221‧‧‧Auxiliary support

222‧‧‧Auxiliary rotating parts

223‧‧‧Baffle

224‧‧‧First accommodation space

225‧‧‧Second accommodating space

3‧‧‧Drive structure

31‧‧‧ stator

32‧‧‧Rotor Department

321‧‧‧clamping department

33‧‧‧ mandrel

4‧‧‧Tool head

5‧‧‧Power source

51‧‧‧Control circuit

52‧‧‧Power cord

Figure 1 is a schematic view showing the structure of a small machine tool of the present invention.

Fig. 2 is a schematic exploded view showing the structure of the small machine tool of the present invention.

Figure 3 is a schematic cross-sectional view showing the structure of the small machine tool of the present invention.

Figure 4 is a cross-sectional view showing another embodiment of the structure of the small machine tool of the present invention.

The detailed description and the technical content of the present invention are described below with reference to the drawings: Please refer to FIG. 1 , FIG. 2 and FIG. 3 : the present invention is a small machine tool structure including a hollow outer casing 1 and a a fixing base 2 in the hollow casing 1 and a driving structure 3 connected to the fixing base 2, the hollow casing 1 has a fixing portion 11 and a hollow housing 1 and a tool head 4 Through hole 12. The fixing base 2 includes a connecting portion 21 connected to the fixing portion 11 and a hollow shaft portion 22 coaxially disposed with the through hole 12. The hollow shaft portion 22 includes an auxiliary supporting member 221 and at least one auxiliary rotation Item 222. The driving structure 3 includes a stator portion 31 which is provided with the hollow shaft portion 22 and generates a magnetic force after being energized, a rotor portion 32 disposed opposite to the outside of the stator portion 31 and driven by the magnetic force, and two ends respectively The rotor portion 32 is coupled to the tool head 4 and coaxially with the through hole 12, and the hollow shaft portion 22, the auxiliary support member 221 and the spindle 33 of the auxiliary rotating member 222 are received. The spindle 33 is received by the rotor portion 32. The tool head 4 is rotated and driven.

In one embodiment of the present invention, the rotor portion 32 has a plurality of clamping portions 321 that are clamped to the mandrel 33 at one end. The one end of the spindle 33 is fixed by the clamping portions 321 and is interlocked by the rotor portion 32. The other end is passed through the auxiliary support member 221 and supported by the auxiliary support member 221. The auxiliary support member 221 and the auxiliary rotating member 222 are ball bearings for stabilizing the rotation of the spindle 33 so that the spindle 33 does not sway during rotation to achieve better working accuracy. Different from the conventional tool machine, the front and rear end plates are respectively provided with a ball bearing on the front and rear end plates. The hollow shaft portion 22 of the present invention has a partition plate 223, and the hollow shaft portion 22 is subjected to the partition plate. The 223 is divided into a first accommodating space 224 that accommodates the auxiliary support member 221 and a second accommodating space 225 that communicates with the first accommodating space 224 and accommodates at least one auxiliary rotating member 222. In this way, the present invention can increase the auxiliary output in the second accommodating space 225 with different output powers. The number of moving members 222 is such that the rotation of the mandrel 33 is stronger, and no additional space is required.

Another advantage of the present invention is that in order to achieve higher working accuracy, a conventional power tool must use a better power supply to supply a relatively stable current, but a better power supply is relatively expensive. The present invention can accommodate a plurality of auxiliary rotating members 222 in the second accommodating space 225, so that the present invention can be combined with a cheaper power supply, although the current supplied by the less expensive power supply is unstable, but through the present The auxiliary rotating member 222 and the auxiliary supporting member 221 can compensate for the lack of current instability, and the mandrel 33 can be stabilized so that the mandrel 33 does not shake when rotated, thereby effectively stabilizing the working precision of the mandrel 33.

In a specific embodiment of the present invention, the stator portion 31 is electrically connected to a power source 5 having a control circuit 51 disposed in the hollow housing 1 and outputting a power to the stator portion 31 and a control unit 51. The control circuit 51 and the power supply line 52 of the stator portion 31 are connected. In order to prevent the rotor portion 32 from being entangled with the power cord 52 when rotating, the connecting portion 21 has a wire groove 211 for receiving the power wire 52, and the power wire 52 passes through the wire groove 211. Connected to the stator portion 31, and output a current to the stator portion 31 through the control circuit 51, the stator portion 31 generates a magnetic force, and the magnetic portion drives the rotor portion 32 to rotate. The rotor portion 32 interlocks the mandrel. The tool head 4 is rotated to perform a machining operation, wherein the tool head 4 is a drill bit.

Referring to FIG. 4, it is a schematic cross-sectional view of another embodiment of the small machine tool structure of the present invention. As shown in the figure, the tool head 4 of the present invention may be an abrasive disc, in addition to the implementation of the drill bit. The mandrel 33 passes through the auxiliary support member 221 of the first accommodating space 224 and the auxiliary rotating member 222 received in the second accommodating space 225 to support and stabilize the rotation of the mandrel 33. The stator portion 31 is also controlled by the control circuit 51 to control the opening and closing of the magnetic force. In the embodiment of the present invention, the control unit is electrically controlled. The road 51 is disposed in the hollow casing 1, but is not limited thereto. The control circuit 51 generates heat energy when the machine tool is working, and heat dissipation fins are added to prevent overheating. Considering the trend of being light, thin, short, and small, the control circuit 51 of the present invention is not limited to be disposed in the hollow casing 1, and may be disposed outside the machine tool, and only connected by the power cord 52, so that Reduce the size and weight of the machine.

In summary, the machine tool of the present invention is different from the conventional tool machine by the limitation of the front and rear end plates. The present invention uses a single fixing seat with an outer rotor structure, and is provided with a mandrel, and one end of the mandrel is connected with the rotor portion, and the other end is connected. The auxiliary support member is supported by the auxiliary support member, and after the stator portion is energized, the rotor portion is driven to rotate, and the rotor portion is coupled to the mandrel to generate a stable rotation. This saves the space required for the rear-end board setup and greatly increases the size of the machine tool.

In addition, the conventional machine tool must increase the size of the ball bearing or increase the number of ball bearings to both ends of the mandrel to withstand the large rotating force, but the size of the machine tool will also follow. increase. The invention is designed according to the above structure, and more than one auxiliary rotating member is placed in the second space, and the auxiliary rotating member is added in the existing space, and no additional space is needed to accommodate the newly added auxiliary rotating member, and the auxiliary is added. The number of rotating members does not require an increase in the size of the auxiliary rotating member to increase the volume of the machine tool.

Therefore, the present invention is highly progressive and conforms to the requirements of the invention patent application, and the application is filed according to law, and the praying office grants the patent as soon as possible.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

2‧‧‧ Fixed seat

21‧‧‧Connecting Department

211‧‧‧Line groove

22‧‧‧ hollow shaft

221‧‧‧Auxiliary support

222‧‧‧Auxiliary rotating parts

223‧‧‧Baffle

225‧‧‧Second accommodating space

31‧‧‧ stator

32‧‧‧Rotor Department

321‧‧‧clamping department

33‧‧‧ mandrel

4‧‧‧Tool head

52‧‧‧Power cord

Claims (7)

The utility model relates to a small machine tool structure, comprising: a hollow outer casing having a fixing portion and a through hole disposed in the hollow outer casing and provided by a tool head; a fixing base comprising a connection with the fixing portion a connecting portion, and a hollow shaft portion coaxially disposed with the through hole, the hollow shaft portion includes an auxiliary supporting member and at least one auxiliary rotating member; and a driving structure including a set of the hollow shaft portion and after being energized a stator portion for generating a magnetic force, a rotor portion disposed opposite to the outer side of the stator portion and driven by the magnetic force, and a pair of two ends respectively connecting the rotor portion and the tool head and coaxially penetrating the hollow shaft portion with the through hole The auxiliary support member and the spindle of the auxiliary rotating member are coupled to the rotor portion and drive the tool head to rotate. The small machine tool structure of claim 1, wherein the stator portion is electrically connected to a power source, the power source has a control circuit for outputting a power to the stator portion, and a connection between the control circuit and the The power cord of the stator. The small machine tool structure of claim 2, wherein the connecting portion has a line groove for receiving the power line. The small machine tool structure of claim 2, wherein the control circuit is disposed in the hollow casing. The small machine tool structure according to claim 1, wherein the rotor portion has The plurality of jaws of the mandrel are clamped. The small machine tool structure of claim 1, wherein the hollow shaft portion has a partition, and the hollow shaft portion is separated from the first accommodating space for accommodating the auxiliary support member by the partition plate. The first accommodating space accommodates at least one second accommodating space of the auxiliary rotating member. The small machine tool structure of claim 1, wherein the auxiliary support member and the auxiliary rotating member are ball bearings.