CN216227957U

CN216227957U - Workpiece clamping mechanism and numerical control machine tool

Info

Publication number: CN216227957U
Application number: CN202122787758.2U
Authority: CN
Inventors: 张志强; 王海滨; 杨乐柱; 李立武
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-04-08
Anticipated expiration: 2031-11-15

Abstract

The utility model relates to the technical field of numerical control machines and discloses a workpiece clamping mechanism and a numerical control machine. The workpiece clamping mechanism comprises an operating platform assembly and a clamping assembly, the operating platform assembly comprises a driving part and an operating platform, the operating platform is arranged on the driving part, and the driving part is used for driving the operating platform to lift; the clamping assembly is arranged on the operating platform and comprises a first motor, a worm, a supporting rod and two fixing clamps, the worm is arranged on an output shaft of the first motor, the supporting rod is fixed on the operating platform, the fixing clamps comprise clamping parts and worm wheel parts, the fixing clamps are connected to the supporting rod through the worm wheel parts in a rotating mode, the worm wheel parts of the two fixing clamps are connected to two sides of the worm in an engaging mode, and the first motor drives the clamping parts of the two fixing clamps to be close to or far away from the clamping parts through the worm. The utility model increases the flexibility of the operating platform, has large clamping force, improves the stability of the workpiece to be processed during processing, improves the processing quality, and has simple structure and low failure rate.

Description

Workpiece clamping mechanism and numerical control machine tool

Technical Field

The utility model relates to the technical field of numerical control machines, in particular to a workpiece clamping mechanism and a numerical control machine.

Background

At present, numerical control machine tools are widely applied to production and manufacturing, and when the numerical control machine tools are used, workpieces to be machined need to be clamped on an operation table by a clamping mechanism, and subsequent machining can be carried out. In the prior art, the clamping mechanism comprises two fixing plates, clamping blocks are arranged on the side walls, opposite to the fixing plates, of the fixing plates, springs are arranged between the clamping blocks and the fixing plates, the clamping blocks are driven by the springs, the two clamping blocks clamp the workpiece to be machined under the elastic force of the springs, and the workpiece to be machined is fixed. However, the clamping force is adjusted by the spring, so that the problems of insufficient clamping force, poor processing quality of the workpiece to be processed, high failure rate and the like exist.

Accordingly, there is a need for a workpiece clamping mechanism and a numerical control machine tool to solve the above problems.

SUMMERY OF THE UTILITY MODEL

Based on the above, the utility model aims to provide the workpiece clamping mechanism and the numerical control machine tool, which have the advantages of increased flexibility of the operating platform, large clamping force, improved stability of the workpiece to be machined during machining, improved machining quality, simple structure and low failure rate.

In order to achieve the purpose, the utility model adopts the following technical scheme:

in one aspect, there is provided a workpiece clamping mechanism comprising:

the operating platform assembly comprises a driving part and an operating platform, the operating platform is arranged on the driving part, and the driving part is used for driving the operating platform to lift;

the clamping assembly is arranged on the operating table and comprises a first motor, a worm, a supporting rod and two fixing clamps, the worm is arranged on an output shaft of the first motor, the supporting rod is fixed on the operating table, the fixing clamps comprise a clamping part and a worm wheel part, the fixing clamps are rotatably connected to the supporting rod through the worm wheel part, the worm wheel part of each fixing clamp is meshed with the two sides of the worm, and the first motor drives the two fixing clamps to enable the clamping part to be close to or far away.

As a preferred technical scheme of the workpiece clamping mechanism, anti-skid pads are arranged on the opposite side walls of the two clamping parts.

As a preferred technical scheme of the workpiece clamping mechanism, pressure sensors are arranged on the opposite side walls of the two clamping parts, and the pressure sensors are electrically connected to the first motor through a controller.

As a preferred technical scheme of the workpiece clamping mechanism, the driving part comprises a mounting seat and a driving part, and the driving part is connected to the operating platform in a driving manner and can drive the operating platform to lift; the bottom of the operating platform is provided with a guide rod, the top wall of the mounting seat is provided with a guide groove, and the guide rod penetrates through the guide groove in a sliding mode.

As a preferred technical scheme of a work piece fixture, the guide bar is hollow pole, the guide bar is close to guide way one end is provided with the opening, the guide bar deviates from be provided with the vent on the lateral wall of guide way one end.

As an optimal technical scheme of the workpiece clamping mechanism, the driving piece is a second motor, a threaded column is installed on an output shaft of the second motor, the threaded column is vertically arranged, a connecting block is arranged at the bottom of the operating platform, a threaded hole is formed in the bottom of the connecting block, and the threaded column is in threaded connection with the threaded hole.

As an optimal technical scheme of the workpiece clamping mechanism, the driving piece is an air cylinder or an oil cylinder, and the operating platform is connected to an expansion rod of the air cylinder or the oil cylinder.

As a preferred technical scheme of the workpiece clamping mechanism, the number of the guide rods is two; the two guide rods are symmetrically arranged on the lower surface of the operating platform, and the mounting seat is provided with two guide grooves which are in one-to-one correspondence with the two guide rods.

As a preferred technical scheme of the workpiece clamping mechanism, a mounting cavity is arranged in the mounting seat, and the driving piece is mounted in the mounting cavity.

In another aspect, a numerically controlled machine tool is provided, which includes the workpiece clamping mechanism according to any one of the above aspects.

The utility model has the beneficial effects that:

when the clamping assembly works, the driving part can adjust the height of the operating platform according to the requirement of a numerical control machine tool, so that certain limitation is avoided when the clamping assembly is used, and the clamping assembly is more flexible and changeable when the clamping assembly is used; then the first motor drives the worm to rotate, the worm drives the worm wheel parts on the two sides to rotate when rotating, so that the two fixing clamps are driven to rotate around the supporting rod, the clamping parts of the two fixing clamps are close to or far away from each other, and the two clamping parts are close to each other to clamp a workpiece to be machined; when the two clamping parts are far away, the workpiece to be machined is released. Secondly, the clamping force of the fixing clamp is determined by the rotation amount of the worm driving the fixing clamp, the larger the rotation amount is, the larger the clamping force of the fixing clamp is, and the smaller the rotation amount is, so that the clamping force can be controlled conveniently. The utility model increases the flexibility of the operation table, has large clamping force, improves the stability of the workpiece to be processed during processing, improves the processing quality, and has simple structure and low failure rate; moreover, the clamping force of the fixing clamp is adjustable so as to adapt to processing environments with different working conditions.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a workpiece clamping mechanism provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic structural view of a retaining clip according to an embodiment of the present invention;

FIG. 3 is a top view of a workpiece holding mechanism provided in accordance with an embodiment of the present invention;

fig. 4 is an enlarged view of fig. 3 at a.

The figures are labeled as follows:

10. a workpiece to be processed;

1. an operating floor assembly; 11. a drive member; 111. a mounting seat; 1111. a guide groove; 112. a drive member; 1121. a threaded post; 12. an operation table; 13. connecting blocks; 14. a guide bar; 141. a vent;

2. a clamping assembly; 21. a first motor; 22. a worm; 23. a support bar; 24. a fixing clip; 241. a gripping section; 242. a worm gear portion; 25. a non-slip mat; 26. a pressure sensor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 and 2, the present embodiment provides a numerical control machine tool including a workpiece holding mechanism including an operation table assembly 1 and a holding assembly 2.

Specifically, the operating platform assembly 1 comprises a driving part 11 and an operating platform 12, the operating platform 12 is arranged on the driving part 11, the driving part 11 is used for driving the operating platform 12 to ascend and descend, the driving part 11 can adjust the height of the operating platform 12 according to the requirement of a numerical control machine tool, certain limitation is avoided when the operating platform is used, and the clamping assembly 2 is more flexible and changeable when the operating platform is used; the clamping assembly 2 is arranged on the operating table 12, the clamping assembly 2 comprises a first motor 21, a worm 22, a supporting rod 23 and two fixing clamps 24, the worm 22 is arranged on an output shaft of the first motor 21, the supporting rod 23 is fixed on the operating table 12, the fixing clamps 24 comprise a clamping portion 241 and a worm wheel portion 242, the fixing clamps 24 are rotatably connected to the supporting rod 23 through the worm wheel portion 242, the worm wheel portions 242 of the two fixing clamps 24 are connected to two sides of the worm 22 in a meshed mode, and the first motor 21 drives the clamping portions 241 of the two fixing clamps 24 to be close to or far away from each other through the worm 22.

During operation, the driving part 11 adjusts the operation table 12 to a preset height according to the requirement of the numerical control machine, then the first motor 21 drives the worm 22 to rotate, the worm 22 drives the worm wheel parts 242 on both sides to rotate when rotating, so as to drive the two fixing clamps 24 to rotate around the supporting rod 23, so that the clamping parts 241 of the two fixing clamps 24 approach or depart from each other, and the two clamping parts 241 approach each other to clamp the workpiece 10 to be machined; the two gripping portions 241 are moved away to release the member to be worked 10. Secondly, the clamping force of the fixing clamp 24 is determined by the rotation amount of the worm 22 driving the fixing clamp 24, and the larger the rotation amount is, the larger the clamping force of the fixing clamp 24 is, and the smaller the rotation amount is, so that the clamping force can be controlled conveniently. The embodiment increases the flexibility of the operating table 12, has large clamping force, improves the stability of the workpiece 10 to be machined during machining, improves the machining quality, and has simple structure and low failure rate; furthermore, the clamping force of the fixing clamp 24 is adjustable to adapt to processing environments with different working conditions.

Preferably, as shown in fig. 3 and 4, anti-slip pads 25 are disposed on opposite side walls of the two gripping portions 241. The anti-slip pad 25 increases the gripping stability of the workpiece 10 to be gripped, and prevents the workpiece 10 to be gripped from sliding with respect to the gripping section 241. The material of the non-slip mat 25 is elastic rubber.

Further preferably, pressure sensors 26 are disposed on opposite side walls of the two gripping parts 241, and the pressure sensors 26 are electrically connected to the first motor 21 through a controller. Specifically, the pressure sensor 26 is embedded in the clamping part 241 and located between the anti-slip pad 25 and the clamping part 241, and the pressure between the clamping part 241 and the workpiece 10 to be machined is measured by the pressure sensor 26, so as to calculate the clamping force. When the clamping assembly 2 clamps the workpiece 10 to be machined, and the pressure sensor 26 detects that the pressure applied to the workpiece 10 to be machined by the clamping part 241 reaches the preset pressure, the pressure sensor 26 sends a signal to the controller, and the controller drives the first motor 21 to stop rotating, so that the workpiece 10 to be machined or the clamping assembly 2 is prevented from being damaged due to overlarge pressure. It should be noted that the manner in which the pressure sensor 26 is connected to the first motor 21 through the controller is a conventional connection means in the control field, and need not be described herein.

Further, as shown in fig. 1 to 4, the driving part 11 includes a mounting seat 111 and a driving part 112, the driving part 112 is connected to the operating platform 12 in a driving manner, and can drive the operating platform 12 to move up and down; the bottom of operation panel 12 is provided with guide bar 14, is provided with guide way 1111 on the roof of mount pad 111, and guide bar 14 slides and wears to locate in guide way 1111, and guide bar 14 has increased the stability that operation panel 12 goes up and down through guide way 1111.

Since the side wall of the guide bar 14 is connected to the side wall of the guide groove 1111, when the guide bar 14 slides, a compressed air or vacuum is easily generated in the cavity between the bottom end of the guide bar 14 and the bottom wall of the guide groove 1111, which may hinder the sliding of the guide bar 14. Preferably, the guide bar 14 is a hollow bar, an opening is formed at one end of the guide bar 14 close to the guide groove 1111, and a vent 141 is formed on a side wall of one end of the guide bar 14 away from the guide groove 1111, so that the cavity between the bottom end of the guide bar 14 and the bottom wall of the guide groove 1111 is communicated with the atmosphere, thereby preventing the occurrence of compressed air or vacuum phenomenon in the cavity when the guide bar 14 slides. In other embodiments, a through hole may be formed in the bottom wall of the guide groove 1111 to connect the cavity to the external atmosphere.

Further preferably, the number of the guide rods 14 is two; the two guide rods 14 are symmetrically disposed on the lower surface of the console 12, and the mounting base 111 is provided with two guide grooves 1111 corresponding to the two guide rods 14 one to one.

In this embodiment, the driving member 112 is a second motor, the threaded post 1121 is installed on an output shaft of the second motor, the threaded post 1121 is vertically disposed, the bottom of the operating platform 12 is provided with the connecting block 13, the bottom of the connecting block 13 is provided with a threaded hole, and the threaded post 1121 is in threaded connection with the threaded hole. When the second motor drives the threaded column 1121 to rotate, the threaded column 1121 can drive the connecting block 13 to slide along the axial direction of the threaded column 1121, and the connecting block 13 drives the operating platform 12 to ascend and descend. During the process of lifting the operation table 12, the guide rod 14 can also prevent the operation table 12 from rotating relative to the threaded post 1121, thereby improving the stability of lifting the operation table 12.

In other embodiments, the driving member 112 may also be an air cylinder or an oil cylinder, and the operation platform 12 is connected to an expansion rod of the air cylinder or the oil cylinder, and the air cylinder or the oil cylinder is vertically arranged and can drive the operation platform 12 to ascend and descend.

Preferably, a mounting cavity is provided in the mounting seat 111, and the driving member 112 is mounted in the mounting cavity to improve the stability of mounting of the driving member 112.

Preferably, four supporting legs are fixed on the lower surface of the mounting seat 111, and the four supporting legs are arranged at four corners of the mounting seat 111 in a rectangular array, and can adjust the levelness of the mounting seat 111.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A workpiece clamping mechanism, comprising:

the operating platform assembly (1) comprises a driving part (11) and an operating platform (12), the operating platform (12) is arranged on the driving part (11), and the driving part (11) is used for driving the operating platform (12) to ascend and descend;

the clamping assembly (2) is arranged on the operating platform (12), the clamping assembly (2) comprises a first motor (21), a worm (22), a supporting rod (23) and two fixing clamps (24), the worm (22) is arranged on an output shaft of the first motor (21), the supporting rod (23) is fixed on the operating platform (12), the fixing clamps (24) comprise clamping parts (241) and worm wheel parts (242), the fixing clamps (24) are rotatably connected to the supporting rod (23) through the worm wheel parts (242), the worm wheel parts (242) of the two fixing clamps (24) are connected to two sides of the worm (22) in a meshed mode, and the first motor (21) drives the clamping parts (241) of the two fixing clamps (24) to be close to or far away through the worm (22).

2. The workholding device according to claim 1, characterized in that the two gripper sections (241) are provided with anti-slip pads (25) on opposite side walls.

3. The workpiece clamping mechanism according to claim 1, wherein pressure sensors (26) are arranged on the opposite side walls of the two clamping parts (241), and the pressure sensors (26) are electrically connected to the first motor (21) through a controller.

4. The workpiece clamping mechanism according to claim 1, characterized in that the driving part (11) comprises a mounting seat (111) and a driving part (112), the driving part (112) is connected to the operating platform (12) in a driving way, and can drive the operating platform (12) to ascend and descend; the bottom of the operating platform (12) is provided with a guide rod (14), the top wall of the mounting seat (111) is provided with a guide groove (1111), and the guide rod (14) is slidably arranged in the guide groove (1111).

5. Workpiece holding mechanism according to claim 4, characterised in that the guide bar (14) is a hollow bar, that the guide bar (14) is provided with an opening near the end of the guide slot (1111), and that the side wall of the guide bar (14) facing away from the end of the guide slot (1111) is provided with ventilation openings (141).

6. The workpiece clamping mechanism according to claim 4, wherein the driving member (112) is a second motor, a threaded column (1121) is mounted on an output shaft of the second motor, the threaded column (1121) is vertically arranged, a connecting block (13) is arranged at the bottom of the operating platform (12), a threaded hole is arranged at the bottom of the connecting block (13), and the threaded column (1121) is in threaded connection with the threaded hole.

7. The workpiece clamping mechanism of claim 4, wherein the driving member (112) is an air cylinder or an oil cylinder, and the operation table (12) is connected to a telescopic rod of the air cylinder or the oil cylinder.

8. The workholding mechanism of claim 4, characterized in that said guide rods (14) are two; two guide bar (14) symmetry set up in the lower surface of operation panel (12), be provided with on mount pad (111) with two guide way (1111) of guide bar (14) one-to-one.

9. The workpiece clamping mechanism of claim 4, wherein a mounting cavity is provided in the mounting seat (111) and the driving member (112) is mounted in the mounting cavity.

10. A numerically controlled machine tool comprising a workpiece holding mechanism as claimed in any one of claims 1 to 9.