Pneumatic zero-point clamp

Abstract

The pneumatic zero-point clamp is provided with a supporting base, a shell, a locking steel ball and a piston, the supporting base is provided with a boss and a middle column protruding upwards from the boss, and a middle hole with an upward opening is formed in the middle column; the shell is assembled on the supporting base and covers the boss and the middle column, a positioning hole formed in the shell and a middle hole of the middle column are in an up-down opposite relation, and an air blowing hole is formed in the inner wall of the positioning hole; the locking steel ball is arranged on the middle column and can expand and retract around the center line of the middle hole; the piston is arranged in the shell and can move up and down in a reciprocating manner, a driving part on the piston moves along with the piston and establishes a locking state and a releasing state, and in the locking state, the locking steel ball is folded towards the middle line direction of the middle hole; and in the release state, the locking steel ball can move freely. According to the utility model, rapid clamping, centering and positioning can be realized, and the production efficiency is improved; and meanwhile, the blowing self-cleaning function is developed, the problem of slag falling and padding can be solved, the influence of machining chippings on the clamp is reduced, and practicability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a pneumatic zero-point clamp used in precision mechanical processing. Background Art

[0002] When CNC lathes and ordinary lathes are turning workpieces, the workpieces need to be clamped. However, when using traditional clamping structures for clamping, the clamping time is long, and it is not easy to center and position. Repeated trial clamping is required, and it is very easy to damage the positioning surface. Especially in the process of repeated trial clamping in mass production, it not only affects the production and processing efficiency, but also affects the centering and positioning accuracy of the workpiece. There are also adverse consequences caused by slag padding during production, which reduces the processing accuracy of the workpiece. Summary of the invention

[0003] The utility model aims to provide a pneumatic zero-point clamp with fast clamping speed, accurate and stable positioning, and a chip blowing function to avoid the influence of chip jamming.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] Pneumatic zero point fixture, which has:

[0006] A support base, wherein the upper side of the support base is provided with a raised boss and a middle column protruding upward from the boss, and the middle column is provided with a middle hole opening upward;

[0007] The housing is composed of a top cover and a peripheral wall, the housing is assembled on the support base and covers the boss and the middle column, and the top cover is provided with a positioning hole and a protruding positioning column, the positioning column is distributed on the periphery of the positioning hole, and the positioning hole and the middle hole of the middle column form a vertically opposite relationship, and the inner wall of the positioning hole is provided with a blowing hole;

[0008] The locking steel ball is arranged on the center column and can expand and contract around the center line of the center hole;

[0009] The piston is arranged inside the shell and can reciprocate along the protruding direction of the center column; a driving part is provided on the piston, which follows the movement of the piston and establishes a locking state and a releasing state. In the locking state, the driving part drives the locking steel ball to retract toward the center line direction of the center hole; and in the releasing state, the driving part releases the locking steel ball so that the locking steel ball can move freely.

[0010] The above scheme is further provided with a spring between the piston and the boss, and the spring supports the piston so that the piston drives the driving part to establish a locking state.

[0011] The above scheme is further that the support base, the shell and the piston together enclose an unlocking chamber and a pressurizing chamber, and air pressure is introduced through the unlocking chamber and the pressurizing chamber to drive the piston to move in forward and reverse directions.

[0012] The above scheme is further that the locking steel ball is arranged on the end head of the middle column, the piston is sleeved on the middle column, and the driving part is a ring platform protruding on the upper side of the piston, so that the driving part is erected after assembly to form a wall state surrounding the outside of the locking steel ball, and a driving contact surface and a horn surface extending outward from the driving contact surface are provided on the inner side of the driving part; the driving contact surface is used to contact and push the locking steel ball so that the locking steel ball is retracted toward the center line direction of the middle hole; the horn surface provides an avoidance space so that the locking steel ball is released.

[0013] The above solution is further that, when the driving part is assembled, it is also supported by the inner ring wall preset inside the shell.

[0014] The above solution is further characterized in that the upper top surface of the top cover is an arc surface extending obliquely downward from the outer periphery of the positioning hole.

[0015] After adopting the above structure, the pneumatic zero-point clamp of the utility model can well solve the pain points in production and is suitable for precision machining. Through the cooperative positioning of the positioning hole on the outer shell and the middle hole of the middle column, as well as the clamping and locking of the locking steel ball, it can be quickly clamped, centered and positioned, thereby improving production efficiency. At the same time, an air hole is provided on the inner wall of the positioning hole, and an air blowing self-cleaning function is developed, which can solve the problem of slag falling and padding, reduce the influence of machining debris on the clamp, is more practical, meets the needs of automated production, and is conducive to promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the utility model;

[0017] Attached Figure 2 for Figure 1 A schematic diagram of the structural decomposition of an embodiment;

[0018] Attached Figure 3 for Figure 2 Another perspective schematic diagram of the embodiment;

[0019] Attached Figure 4 for Figure 1 A schematic diagram of the assembly of the local structure on the support base of the embodiment;

[0020] Attached Figure 5 , 6 for Figure 1 A cross-sectional view of the internal structure of an embodiment. DETAILED DESCRIPTION

[0021] The concept, specific structure and technical effects of the utility model will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the utility model.

[0022] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] See also Figure 1 , 2 , 3, 4, 5, and 6 are schematic diagrams of preferred embodiments of the present invention. The present invention relates to a pneumatic zero-point clamp, which comprises: a support base 1, a housing 2, a locking steel ball 3, and a piston 4. The support base 1 is used to connect to corresponding machinery and equipment and provide corresponding installation space. A raised boss 11 and a middle column 12 raised upward from the boss 11 are provided on the upper side surface of the support base 1. A middle hole 121 with an opening facing upward is provided inside the middle column 12. In the present embodiment, the middle hole 121 passes through the support base 1 to facilitate the subsequent removal of debris, etc. The outer shell 2 is composed of a top cover 21 and a peripheral wall portion 22 enclosed by the top cover, forming a cover shape; the outer shell 2 is assembled on the support base 1 in an inverted manner and covers the boss 11 and the middle column 12, and a positioning hole 211 and a protruding positioning column 212 are provided on the top cover 21, and the positioning column 212 is distributed on the outer periphery of the positioning hole 211; in this embodiment, the positioning column 212 is tooth-shaped and has positioning surfaces in multiple directions. The positioning column 212 is used to cooperate with the positioning part on the workpiece to provide positioning installation for the workpiece, thereby improving the clamping accuracy and stability. The positioning hole 211 and the middle hole 121 of the middle column 12 form a vertically facing relationship, so that the installation pin set on the workpiece can be inserted and connected to obtain good centering and positioning effects. In this embodiment, a blowing hole 213 is also provided on the inner wall of the positioning hole 211, and the blowing hole 213 is set in a spiral shape to blow out spiral gas, so as to clean the processing debris in the positioning hole 211 and prevent the adverse effects caused by the stuck chips. The locking steel ball 3 is arranged on the center column 12 and can expand and contract around the center line of the center hole 121 to clamp or release the mounting pin arranged on the workpiece, so as to fix and disassemble the workpiece. The piston 4 is arranged inside the housing 2 and can reciprocate along the protruding direction of the center column 12; a driving part 41 is arranged on the piston 4, and the driving part 41 follows the movement of the piston 4 and establishes a locking state and a releasing state. In the locking state, the driving part 41 drives the locking steel ball 3 to contract toward the center line direction of the center hole 121 to lock the workpiece; and in the releasing state, the driving part 41 releases the locking steel ball 3, so that the locking steel ball 3 can move freely, thereby taking and placing the workpiece.

[0024] In this embodiment, a spring 5 is provided between the piston 4 and the boss 11. The spring 5 supports the piston 4, so that the piston 4 drives the driving part 41 to establish a locking state, which has a pressure-maintaining effect, and allows the locking steel ball 3 to continuously close and lock the workpiece. Further, the support base 1, the housing 2 and the piston 4 together enclose an unlocking chamber 61 and a pressurizing chamber 62, and the air pressure is introduced into the unlocking chamber 61 and the pressurizing chamber 62 to drive the piston 4 to move in the positive and negative directions. When the air pressure is introduced into the unlocking chamber 61 (the pressurizing chamber 62 is deflated at this time), the elastic force of the spring 5 can be overcome to push the piston 4 to move, and then the driving part 41 releases the locking steel ball 3, so that the locking steel ball 3 can move freely and establish a released state; when the pressurizing chamber 62 is introduced into the air pressure (the unlocking chamber 61 is deflated at this time), the piston 4 is driven to move together with the spring 5, and the driving part 41 drives the locking steel ball 3 to close in the center line direction of the center hole 121, thereby increasing the clamping force, obtaining the pressurizing function, and improving the clamping stability. The unlocking chamber 61 and the pressurizing chamber 62 form a positive and negative air pressure circuit. At this time, the support base 1 and the shell 2 form corresponding air flow channels to meet the work of the unlocking chamber 61 and the pressurizing chamber 62. Of course, in this embodiment, the support base 1 and the shell 2 also form corresponding air flow channels for connecting the blowing holes 213 so that the blowing holes 213 can blow air to clean the processing debris in the positioning hole 211 and prevent the adverse effects caused by the stuck chips. The interfaces of the air flow channels of this embodiment are all set on the support base 1, which can be connected to the corresponding air source and controlled separately, thereby realizing the unlocking, pressurizing, and blowing functions of the utility model and meeting the needs of automated production.

[0025] Figure 1 , 2 As shown in Figures 4, 5 and 6, in the present embodiment, the locking steel ball 3 is arranged on the end of the middle column 12, and the end of the middle column 12 is correspondingly recessed to facilitate the positioning and placement of the locking steel ball 3, and then the locking steel ball 3 is further restricted by assembling the outer shell 2, so that the locking steel ball 3 can be distributed between the positioning hole 211 and the middle hole 121, with a simple structure and convenient assembly. The piston 4 is in the shape of a hollow disk and is sleeved on the middle column 12. The driving part 41 is a raised ring on the upper side of the piston 4, so that the driving part 41 is erected after assembly to form a wall around the outside of the locking steel ball 3, further restricting the locking steel ball 3 and facilitating subsequent driving work; a driving contact surface 411 and a horn surface 412 extending outward from the driving contact surface are provided on the inner side of the driving part 41; the driving contact surface 411 is used to contact and push the locking steel ball 3, so that the locking steel ball 3 is gathered toward the center line direction of the middle hole 121; the horn surface 412 provides an escape space so that the locking steel ball 3 is released. Thus, through the movement of the driving part 41, the driving contact surface 411 and the horn surface 412 exchange the effect of the locking steel ball 3, thereby realizing the locking state or the release state of the locking steel ball 3, with a simple structure and stable and reliable operation.

[0026] In this embodiment, the driving part 41 is also supported by the inner ring wall 23 preset inside the shell during assembly. The back of the driving part 41 is against the inner ring wall 23, which makes the assembly simple. The inner ring wall 23 can increase the structural property of the driving part 41 and further guide the movement of the driving part 41, thereby ensuring that the driving part 41 drives the locking steel ball 3 to work accurately and stably.

[0027] In this embodiment, the upper top surface of the top cover 21 is an arc surface extending downward from the outer periphery of the positioning hole 211. By utilizing the slope of the upper top surface, processing debris can be discharged automatically, achieving a self-cleaning effect and solving the slag accumulation problem.

[0028] In this embodiment, a sensor may be further added to provide feedback on the locking status so as to facilitate self-monitoring and control of automated production.

[0029] Experiments have shown that the pneumatic zero-point clamp of the utility model can effectively solve the pain points in production and is suitable for precision machining. Through the collaborative positioning of the positioning hole on the outer shell and the middle hole of the middle column, as well as the clamping and locking of the locking steel ball, it can be quickly clamped, centered and positioned, thereby improving production efficiency. At the same time, an air hole is provided on the inner wall of the positioning hole, and an air blowing self-cleaning function is developed to solve the problem of slag falling and padding, reduce the influence of machining debris on the clamp, have stronger practicality, meet the needs of automated production, and is conducive to promotion and use.

[0030] Although the preferred specific embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention should not be limited to the structures and operations that are exactly the same as the above description and the accompanying drawings. For those skilled in the art, many equivalent improvements and changes can be made to the above embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, but these improvements and changes should all fall within the scope of protection required by the present invention.

Claims

1. Pneumatic zero point fixture, characterized in that: have: A support base (1), wherein the upper side of the support base (1) is provided with a raised boss (11) and a middle column (12) protruding upward from the boss (11), and the middle column (12) is provided with a middle hole (121) opening upward; A housing (2) composed of a top cover (21) and a peripheral wall portion (22), the housing (2) being assembled on the support base (1) and covering the boss (11) and the middle column (12), and a positioning hole (211) and a protruding positioning column (212) being provided on the top cover (21), the positioning column (212) being distributed on the periphery of the positioning hole (211), the positioning hole (211) and the middle hole (121) of the middle column (12) forming a vertically opposite relationship, and an air blowing hole (213) being provided on the inner wall of the positioning hole (211); A locking steel ball (3) is arranged on the middle column (12) and can expand and contract around the center line of the middle hole (121); The piston (4) is arranged inside the housing (2) and can reciprocate along the protruding direction of the center column (12); a driving part (41) is provided on the piston (4), and the driving part (41) moves with the piston (4) and establishes a locking state and a release state. In the locking state, the driving part (41) drives the locking steel ball (3) to retract toward the center line direction of the center hole (121); and in the release state, the driving part (41) releases the locking steel ball (3) so that the locking steel ball (3) can move freely.

2. The pneumatic zero-point fixture according to claim 1, characterized in that: A spring (5) is provided between the piston (4) and the boss (11), and the spring (5) supports the piston (4), so that the piston (4) drives the driving part (41) to establish a locking state.

3. The pneumatic zero-point fixture according to claim 1, characterized in that: The support base (1), the housing (2) and the piston (4) together enclose an unlocking chamber (61) and a pressurizing chamber (62), and air pressure is introduced into the unlocking chamber (61) and the pressurizing chamber (62) respectively to drive the piston (4) to move in forward and reverse directions.

4. The pneumatic zero-point fixture according to claim 1, characterized in that: The locking steel ball (3) is arranged on the end of the middle column (12), the piston (4) is sleeved on the middle column (12), the driving part (41) is a protruding ring platform on the upper side of the piston (4), so that the driving part (41) is erected after assembly to form a wall state surrounding the outer side of the locking steel ball (3), and a driving contact surface (411) and a horn surface (412) extending outward from the driving contact surface are provided on the inner side of the driving part (41); the driving contact surface (411) is used to contact and push the locking steel ball (3) so that the locking steel ball (3) is retracted in the center line direction of the middle hole (121); the horn surface (412) provides an escape space so that the locking steel ball (3) is released.

5. The pneumatic zero point fixture according to claim 4, characterized in that: When the driving part (41) is assembled, it is also supported by the inner ring wall (23) preset inside the shell.

6. The pneumatic zero-point fixture according to claim 1, characterized in that: The upper top surface of the top cover (21) is an arc surface extending obliquely downward from the outer periphery of the positioning hole (211).

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