High-precision clamp
By introducing positioning components and clamping mechanisms into the fixture, and using positioning pins and limiting parts to restrict the movement of the shaft end, the stability problem of long shafts during clamping is solved, and high-precision shaft machining is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO YONGSHI MOTOR CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-01
AI Technical Summary
Existing fixtures are prone to deformation or displacement due to unbalanced forces when clamping long shafts, affecting machining accuracy. Furthermore, existing improvement measures have increased assembly complexity and cost.
A high-precision fixture is adopted, which includes a support base, a positioning component, and a clamping mechanism. The positioning component restricts the movement of the shaft end through a positioning column, and the clamping mechanism clamps the other end through a jaw block. A conical limiting part is set on the top of the positioning column and a through groove structure is opened on the support base to improve stability.
It improves the clamping stability and machining accuracy of the shaft, reduces the complexity and cost of the clamping device, and ensures that the shaft is not easily displaced during machining.
Smart Images
Figure CN224182565U_ABST
Abstract
Description
A high-precision clamp Technical Field
[0001] This application relates to the field of machining auxiliary tool technology, and in particular to a high-precision fixture. Background Technology
[0002] In modern industrial production, the machining quality of mechanical equipment parts directly affects the operating efficiency and stability of the entire system. Especially in shaft machining, ensuring the machining accuracy of shafts has always been a key concern in the industry, which places higher demands on fixture design.
[0003] Currently, when machining shafts, a fixture is used to hold one end of the shaft before machining. While this single-point clamping fixture is simple and easy to use, and performs reasonably well on short and small parts, it is prone to deformation or displacement due to unbalanced forces when clamping and machining long shafts, affecting clamping accuracy. Furthermore, some improvements, such as adding side support blocks to distribute pressure, can alleviate localized stress concentration to some extent, but these increase assembly complexity and cost, failing to fundamentally solve the problem. Summary of the Invention
[0004] In order to improve the clamping stability of the fixture on the shaft and thus increase the machining accuracy of the entire shaft, this application provides a high-precision fixture.
[0005] The high-precision fixture provided in this application adopts the following technical solution:
[0006] A high-precision clamp includes a support base, a positioning component mounted on the bottom of the support base, and a clamping mechanism disposed on the support base; the positioning component includes a positioning base and a positioning post connected to the positioning base and used to limit the movement of the end of the shaft; the clamping mechanism includes at least two gripper blocks for clamping one end of the shaft and a clamping drive component for driving the gripper blocks to rise and fall.
[0007] By adopting the above technical solution, a positioning component is set at the bottom of the support base. The positioning component is equipped with a positioning post for limiting the movement of the shaft end. When the operator puts the shaft into the fixture, the shaft end is placed on the positioning post. The positioning post limits the movement of the shaft end. Then, the clamping mechanism is controlled to clamp the other end of the shaft. Finally, the shaft is processed. Setting a limiting device at both ends of the shaft helps to improve the clamping stability of the fixture on the shaft, thereby helping to increase the processing accuracy of the entire shaft.
[0008] Optionally, the top of the positioning post is provided with a limiting part for abutting the end of the shaft, and the limiting part is conical.
[0009] By adopting the above technical solution, since a conical limiting part is set at the top of the positioning column, when the end of the shaft comes into contact with the limiting part, it can be positioned and pressed tightly under the guidance of the conical surface of the limiting part, thereby limiting the displacement of the shaft during the processing.
[0010] Optionally, the support base has a first threaded hole circumferentially at its bottom, and the positioning base has a first through hole circumferentially therein, and a first bolt that mates with the first threaded hole is installed in the first through hole.
[0011] By adopting the above technical solution, the connection method of the support base and the positioning base is disclosed. The support base and the positioning base are connected by the first threaded hole of the support base and the first bolt of the positioning base, so that the connection strength of the two is ideal.
[0012] Optionally, the support base includes a support base, a pressure block mounted on the support base, and a gasket disposed between the support base and the pressure block. The support base has a second threaded hole circumferentially opened at its top. The pressure block has a second through hole circumferentially opened and a second bolt that mates with the second threaded hole is installed in the second through hole. The gasket has a third through hole circumferentially opened for the second bolt to pass through.
[0013] By adopting the above technical solution, the specific structure of the support base is disclosed. The support base includes a support base, a gasket, and a pressure block from bottom to top. The second bolt provided on the pressure block passes through the third through hole of the gasket and connects with the second threaded hole of the support base, so that the connection strength between the pressure block, the gasket, and the support base is ideal, and it is also convenient to disassemble and assemble the pressure block and the gasket. By replacing the gasket with different thicknesses, it is convenient to process shafts of different lengths.
[0014] Optionally, the outer peripheral wall of the gripper block has a first inclined surface that slopes inward toward the support base, and the inner peripheral wall of the pressure block has a second inclined surface that mates with the first inclined surface; the gripper block is provided with a gripping groove for gripping the shaft, and the gripping groove forms a gripping hole on the inner wall of the gripper block. When the gripping drive member drives the gripper block to rise, the gripping hole is in an open state, and when the gripping drive member drives the gripper block to fall, the gripping hole is in a closed state.
[0015] By adopting the above technical solution, since the outer peripheral wall of the gripper block has a first inclined surface that slopes inward toward the support seat, and the inner peripheral wall of the pressure block has a second inclined surface that cooperates with the first inclined surface, the first and second inclined surfaces cooperate with each other to facilitate the lifting and lowering of the gripper block. After the gripper seat rises, the clamping hole is in the open state, which makes it easy for the operator to place the shaft in the clamping hole. After the gripper seat falls, the clamping hole is in the closed state, which allows the gripper block to clamp the shaft.
[0016] Optionally, the support base is provided with a through-slot structure symmetrically along the axis.
[0017] By adopting the above technical solution, since the support seat has a through groove structure symmetrically opened along the axis, it is convenient for operators to use tools to blow away the debris generated and entering the support seat during the machining of the shaft.
[0018] Optionally, the clamping mechanism may further include a rubber pad disposed between two adjacent gripper blocks.
[0019] By adopting the above technical solution, a rubber pad is set between two adjacent gripper blocks, which forms a seal between the two adjacent gripper blocks and enhances the friction, reducing the probability of slippage between the gripper blocks and improving the stability of clamping.
[0020] Optionally, the side wall of the pressure block is provided with a limiting threaded hole and a limiting bolt for limiting the circumferential rotation of the gripper block is installed in the limiting threaded hole, and the side wall of the gripper block is provided with a limiting groove for the end of the limiting bolt to be arranged.
[0021] By adopting the above technical solution, since a limiting bolt is provided on the side wall of the pressure block and the end of the limiting bolt is arranged in the limiting groove of the gripper block, the probability of the gripper block rotating circumferentially is reduced, which helps to stabilize the shaft.
[0022] Optionally, the gripper block has a first engaging groove at its bottom, and the gripping drive has a first engaging block that engages with the first engaging groove.
[0023] By adopting the above technical solution, the connection method of the gripper block and the gripping drive component is disclosed. The gripper block and the gripping drive component are engaged through the first engaging groove of the gripper block and the first engaging block of the gripping drive component. The connection strength is ideal, which helps the gripping drive component to smoothly drive the gripper block to rise and fall.
[0024] Optionally, the support base is provided with a positioning groove that mates with the gasket.
[0025] By adopting the above technical solution, the positioning groove in the support base makes it easy for operators to position and place the pads on the support base.
[0026] In summary, this application includes at least one of the following beneficial technical effects:
[0027] 1. A high-precision fixture, which provides a positioning component and a clamping mechanism on a support base, wherein the positioning component is provided with a positioning post for limiting the movement of the shaft end, which helps to improve the clamping stability of the fixture on the shaft, thereby helping to increase the machining accuracy of the entire shaft;
[0028] 2. By providing a limiting part at the top of the positioning post to abut the end of the shaft, the limiting part is conical, so that when the end of the shaft contacts the limiting part, it can be positioned and pressed tightly under the guidance of the conical surface of the limiting part, thereby limiting the displacement of the shaft during the processing.
[0029] 3. By creating a through-slot structure on the support base, it is convenient for operators to use tools to blow away debris generated during the machining of the shaft and that enters the support base. Attached Figure Description
[0030] Figure 1 is a front view of the high-precision fixture in an embodiment of this application.
[0031] Figure 2 is a cross-sectional schematic diagram of the high-precision fixture in the embodiment of this application.
[0032] Figure 3 is a cross-sectional schematic diagram of the support base in an embodiment of this application.
[0033] Figure 4 is a cross-sectional schematic diagram of the cooperation between the support base and the positioning component in an embodiment of this application.
[0034] Figure 5 is a top view of the high-precision fixture in an embodiment of this application.
[0035] Explanation of reference numerals in the attached drawings: 1. Support base; 11. Support base; 111. Second threaded hole; 112. Positioning groove; 113. First through groove; 114. First threaded hole; 12. Gasket; 121. Second through groove; 122. Third through hole; 13. Pressure block; 131. Second through hole; 132. Second bolt; 133. Limiting threaded hole; 134. Limiting bolt; 135. Second inclined surface; 2. Clamping mechanism; 21. Claw block; 211. First snap-fit groove; 212. First inclined surface; 213. Clamping groove; 214. Clamping hole; 215. Limiting groove; 22. Rubber pad; 23. Clamping drive component; 231. First snap-fit block; 232. Air inlet; 3. Positioning assembly; 31. Positioning base; 311. First through hole; 312. First bolt; 32. Positioning post; 321. Limiting part. Detailed Implementation
[0036] The present application will be further described in detail below with reference to Figures 1-5.
[0037] This application discloses a high-precision fixture. Referring to Figures 1 and 2, the high-precision fixture includes a support base 1, a clamping mechanism 2 mounted on the top of the support base 1, and a positioning component 3 mounted on the bottom of the support base 1. The support base 1 includes a support base 11, a pad 12 mounted on the support base 11, and a pressure block 13 mounted on the pad 12. The support base has a through-slot structure symmetrically formed along its axis. The through-slot structure includes a first through-slot 113 symmetrically formed along the axis of the support base 11 and a second through-slot 121 circumferentially formed at the bottom of the pad 12. The arrangement of the first and second through-slots 121 allows the operator to use tools to blow away debris inside the support base 1.
[0038] Referring to Figure 3, the support base 11 has a second threaded hole 111 circumferentially formed at its top, and the pressure block 13 has a second through hole 131 circumferentially formed, in which a second bolt 132 mates with the second threaded hole 111. The gasket 12 has a third through hole 122 penetrating its upper and lower surfaces, and the second bolt 132 passes through the third through hole 122 and is threaded into the second threaded hole 111, resulting in ideal connection strength between the support base 11, the gasket 12, and the pressure block 13. The support base 11 has a positioning groove 112 that mates with the gasket 12, facilitating the placement of the gasket 12 on the support base 11.
[0039] Referring to Figure 4, the positioning assembly 3 includes a positioning base 31 and a positioning post 32 integrally connected to the positioning base 31. The positioning base 31 has a first through hole 311 penetrating its upper and lower surfaces, and a first bolt 312 is installed in the first through hole 311. The support base 11 has a first threaded hole 114 circumferentially provided at its bottom. The positioning base 31 is threadedly connected to the first threaded hole 114 of the support base 11 by the first bolt 312. The top of the positioning post 32 is provided with a limiting part 321, which is conical. When the end of the shaft contacts the limiting part 321, the limiting part 321 can guide the shaft to move and position, so that the limiting part 321 abuts against the end of the shaft.
[0040] Referring to Figures 2 and 5, the clamping mechanism 2 includes three gripper blocks 21, three rubber pads 22, and a clamping drive component 23. The rubber pads 22 are arranged between two adjacent gripper blocks 21, and the rubber pads and gripper blocks abut against each other. The bottom of the gripper block 21 is provided with a first engaging groove 211. The clamping drive component 23 includes a first engaging block 231 and a drive source. The gripper block 21 and the clamping drive component 23 are engaged through the first engaging groove 211 of the gripper block 21 and the first engaging block 231 of the clamping drive component 23, which helps the clamping drive component 23 to smoothly drive the gripper block 21 to rise and fall. In this embodiment, the drive source is a cylinder. The cylinder has two air inlets 232 on the outer peripheral wall of the pressure block 13. The air inlets 232 are connected to the first engaging block 231. The operator can control the compressed air of different pressures to enter the two air inlets 232, and drive the gripper block 21 to rise or fall through the pressure difference.
[0041] Referring to Figures 2 and 5, the outer peripheral wall of the gripper block 21 has a first inclined surface 212 that slopes inward toward the support base 1, and the inner peripheral wall of the pressure block 13 has a second inclined surface 135 that mates with the first inclined surface 212, facilitating the lifting and lowering movement of the gripper block 21. Each of the three gripper blocks 21 has a gripping groove 213 on its inner side, and the gripping groove 213 forms a gripping hole 214 on the inner wall of the gripper block 21. When the gripping drive 23 drives the gripper block 21 to rise, the gripping hole 214 is in an open state, allowing the operator to place the shaft within the gripping hole 214. When the gripping drive 23 drives the gripper block to descend, the gripping hole 214 is in a closed state, enabling the gripper block 21 to clamp the shaft.
[0042] Referring to Figures 2 and 5, a limiting groove 215 is provided on the side wall of the gripper block 21, and a limiting threaded hole 133 is provided on the side wall of the pressure block 13. A limiting bolt 134 is threadedly installed in the limiting threaded hole 133. The screw of the limiting bolt 134 passes through the limiting threaded hole 133 and is located in the limiting groove 215. The setting of the limiting groove 215 and the limiting bolt 134 restricts the circumferential rotation of the gripper block 21, making the gripper block 21 clamp the shaft more stably.
[0043] The implementation principle of a high-precision fixture in this application embodiment is as follows: Before machining the shaft, the operator first places the shaft into the high-precision fixture. When the end of the shaft contacts the limiting part 321 of the positioning post 32, the end of the shaft can be positioned and pressed under the guidance of the conical surface of the limiting part 321. The positioning post 32 restricts the movement of the end of the shaft. Then, the clamping mechanism 2 is controlled to clamp the other end of the shaft. Finally, the shaft is machined. The limiting devices set at both ends of the shaft help to improve the clamping stability of the fixture on the shaft, making it less likely for the shaft to be displaced during the machining process, thereby increasing the machining accuracy of the entire shaft.
[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A high-precision jig characterized by comprising: It includes a support base (1), a positioning component (3) installed at the bottom of the support base (1), and a clamping mechanism (2) disposed on the support base (1); the positioning component (3) includes a positioning base (31) and a positioning column (32) connected to the positioning base (31) and used to restrict the movement of the shaft end; the clamping mechanism (2) includes at least two gripper blocks (21) for clamping one end of the shaft and a clamping drive member (23) for driving the gripper blocks (21) to rise and fall.
2. The high-precision fixture according to claim 1, characterized in that, The top of the positioning post (32) is provided with a limiting part (321) for abutting the end of the shaft, and the limiting part (321) is conical.
3. The high precision fixture of claim 1, wherein The support base (1) has a first threaded hole (114) circumferentially at its bottom, and the positioning base (31) has a first through hole (311) circumferentially and a first bolt (312) that mates with the first threaded hole (114) is installed in the first through hole (311).
4. A high-precision fixture according to claim 1, characterized in that, The support base (1) includes a support base (11), a pressure block (13) mounted on the support base (11), and a gasket (12) arranged between the support base (11) and the pressure block (13). The support base (11) has a second threaded hole (111) circumferentially opened on its top. The pressure block (13) has a second through hole (131) circumferentially opened and a second bolt (132) that mates with the second threaded hole (111) is installed in the second through hole (131). The gasket (12) has a third through hole (122) circumferentially opened for the second bolt (132) to pass through.
5. A high-precision fixture according to claim 4, characterized in that, The outer peripheral wall of the gripper block (21) has a first inclined surface (212) that is inclined inward toward the support base (1), and the inner peripheral wall of the pressure block (13) has a second inclined surface (135) that cooperates with the first inclined surface (212). The gripper block (21) is provided with a gripping groove (213) for gripping the shaft. The gripping groove (213) forms a gripping hole (214) on the inner wall of the gripper block (21). When the gripping drive member (23) drives the gripper block (21) to rise, the gripping hole (214) is in an open state. When the gripping drive member (23) drives the gripper block (21) to fall, the gripping hole (214) is in a closed state.
6. A high-precision fixture according to claim 1, characterized in that, The support base (1) has a through groove structure symmetrically opened along the axis.
7. A high-precision fixture according to claim 1, characterized in that, The clamping mechanism (2) also includes a rubber pad (22) arranged between two adjacent clamping jaw blocks (21).
8. A high-precision fixture according to claim 4, characterized in that, The side wall of the pressure block (13) has a limiting threaded hole (133) and a limiting bolt (134) for limiting the circumferential rotation of the gripper block (21) is installed in the limiting threaded hole (133). The side wall of the gripper block (21) is provided with a limiting groove (215) for the end of the limiting bolt (134) to be arranged.
9. A high-precision fixture according to claim 1, characterized in that, The gripper block (21) has a first locking groove (211) at its bottom, and the gripping drive member (23) has a first locking block (231) that cooperates with the first locking groove (211).
10. A high-precision fixture according to claim 4, characterized in that, The support base (11) is provided with a positioning groove (112) that mates with the gasket (12).