Self-centering clamp

Abstract

The utility model discloses a self centering fixture, including underframe, outer cylinder, push bar, screw, swivel nut motor, the outer cylinder is provided on the underframe, the outer wall of outer cylinder is evenly provided with a plurality of strip-shaped through holes along the axial direction, the push bar is respectively provided in the plurality of strip-shaped through holes, the screw is provided in the outer cylinder, the swivel nut motor is provided on the outer cylinder. The pushing pieces are arranged outside the screw in a sleeving mode in pairs, the outer sides of the pushing pieces are connected with the inner sides of the pushing strips, and the motor is used for driving the screw to drive the pushing pieces to move up and down and push the pushing strips. According to the device, the screw stops rotating, the pushing piece keeps the current position still, the screw rotates, the pushing piece moves along with the screw, no transmission clearance exists between the screw and the pushing piece, and therefore the clamping precision is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a self-centering clamp. Background Art

[0002] A self-centering fixture is a fixture that automatically positions a workpiece at its center by utilizing the workpiece's inherent characteristics. It is widely used in various fields such as machining, assembly, and testing to improve machining accuracy and production efficiency.

[0003] For example, the Chinese utility model patent document with patent publication number CN219520535U discloses an internally supported self-centering clamp. The clamp places the workpiece on the surface of a mounting plate so that the fixed column is located inside the part. The cylinder drives the mother slider to move upward. When the mother slider moves upward, the centering slider is driven outward through the limit groove to center and clamp the workpiece. The device has a simple structure and low cost.

[0004] The above-mentioned self-centering is limited by the structure, material, manufacturing process, etc. of the cylinder, and the control accuracy of the telescopic length of the cylinder is relatively low, which leads to unstable clamping effect of the clamp. Utility Model Content

[0005] The purpose of the present invention is to overcome the above technical deficiencies and to provide a self-centering clamp to solve the technical problem in the prior art that the control accuracy of the cylinder leads to unstable clamping effect.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The utility model provides a self-centering clamp, including a base frame, an outer cylinder, a push strip, a screw, and a screw sleeve motor. The outer cylinder is arranged on the base frame, and the outer wall of the outer cylinder is evenly opened with a plurality of strip-shaped through holes along the axial direction. The push strips are respectively arranged in the plurality of strip-shaped through holes, and the screw is arranged in the outer cylinder. The pushing members are arranged in pairs on the outside of the screw, and the outer side of the pushing member is connected to the inner side of the pushing strip. The motor is used to drive the screw to drive the pushing member to move up and down and push the pushing strip.

[0008] In some embodiments, a plurality of fixing rods are provided on the outside of the base frame, the plurality of fixing rods are divergent, a sliding groove is provided on the top of the plurality of fixing rods, and a same reinforcement ring is fixedly connected between the outward ends of the plurality of fixing rods.

[0009] In some embodiments, the bottom of the outer cylinder is fixedly connected to the center of the top of the base frame, the plurality of strip-shaped through holes correspond to a plurality of fixing rods respectively, and the bottoms of the plurality of push strips are slidably connected to the plurality of sliding grooves respectively.

[0010] In some embodiments, the top end of the screw is rotatably connected to the top inner wall of the outer cylinder, and the bottom end of the screw is rotatably connected to the top center of the base frame and passes through to the bottom side of the base frame.

[0011] In some embodiments, the pushing member includes a screw sleeve and several connecting rods, the screw sleeve is sleeved on the outside of the screw rod, and several connecting rods are evenly distributed on the outside of the screw sleeve. The connecting rod is rotatably connected to the outside of the pushing member, and the other end of the connecting rod is rotatably connected to the inner side of the adjacent push bar.

[0012] In some embodiments, the motor is mounted on the bottom of the base frame and is adapted to the bottom end of the screw.

[0013] In some embodiments, the output shaft of the motor and the bottom end of the screw are fixedly connected to bevel gears, and the two bevel gears are meshed with each other.

[0014] In some embodiments, a support frame is provided at the bottom of the base frame, and a plurality of fastening screws are provided at the bottom of the support frame.

[0015] In some embodiments, the top of the outer cylinder is semicircular.

[0016] In some embodiments, a rubber sheet is provided on the outward side of the push strip.

[0017] Compared with the prior art, the self-centering clamp provided by the utility model achieves the purpose of improving the clamping accuracy by setting a base frame, an outer cylinder, a push bar, a screw, a screw sleeve and a motor; during specific operation, one end of the workpiece to be fixed is aligned with the outer cylinder and sleeved on the outside of the outer cylinder, and the motor is started. The motor drives the pusher to move downward through the screw, and the pusher moves and can push several push bars to move outward until they contact the inner wall of the workpiece to be processed. The motor stops working, the screw stops rotating, the pusher maintains the current position and does not move. The screw rotates and the pusher moves with it. There is no transmission dead space between the two, thereby ensuring the clamping accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a self-centering fixture provided by an embodiment of the utility model. Figure 1 ;

[0019] Figure 2 yes Figure 1 Right view;

[0020] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle push bar and the push member;

[0021] Figure 4 This is a schematic diagram of the structure of a self-centering fixture provided by an embodiment of the utility model. Figure 2 .

[0022] Explanation of the reference numerals: 100, base frame; 110, fixing rod; 111, slide groove; 120, reinforcement ring; 200, outer cylinder; 210, strip-shaped through hole; 300, push strip; 400, screw; 500, pusher; 510, screw sleeve; 520, connecting rod; 600, motor; 700, bevel gear; 800, support frame; 810, fastening screw; 900, rubber sheet. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In order to solve the technical problem of low operating efficiency, the utility model provides a self-centering clamp that can achieve higher operating efficiency.

[0025] It should be noted that the self-centering clamp described in the present invention is used for but not limited to tooling fixtures, etc. For the sake of convenience, in the present invention, only a self-centering clamp applied to a tooling fixture is used as an example for explanation. The principle of a self-centering clamp applied to other types of equipment is essentially the same as the principle applied to a tooling fixture, so they will not be repeated here.

[0026] See also Figure 1 - Figure 4 , Figure 1 - Figure 4 Schematic diagram of the structure of a self-centering clamp in one embodiment of the present invention, a self-centering clamp includes a base 100, an outer cylinder 200, a push strip 300, a screw 400, a pusher 500 and a motor 600, the outer cylinder 200 is arranged on the base 100, the outer wall of the outer cylinder 200 is uniformly opened with a plurality of strip-shaped through holes 210 along the axial direction, the push strips 300 are respectively arranged in the plurality of strip-shaped through holes 210, the screw 400 is arranged in the outer cylinder 200, the pushers 500 are sleeved on the outside of the screw 400 in pairs, the outer side of the pusher 500 is connected to the inner side of the push strip 300, and the motor 600 is used to drive the screw 400 to drive the pusher 500 to move up and down and push the push strip 300;

[0027] In this embodiment, one end of the workpiece to be fixed is aligned with the outer cylinder 200 and is sleeved on the outside of the outer cylinder 200. The motor 600 is started. The motor 600 drives the pusher 500 to move downward through the screw 400. The pusher 500 moves and can push several push strips 300 to move outward until they contact the inner wall of the workpiece to be processed. The motor 600 stops working, the screw 400 stops rotating, the pusher 500 maintains its current position, and the screw 400 rotates, and the pusher 500 moves with it. There is no transmission gap between the two, thereby ensuring the clamping accuracy.

[0028] In one embodiment, see Figure 1 、 Figure 3 、 Figure 4 , a plurality of fixing rods 110 are provided on the outside of the base frame 100, and the plurality of fixing rods 110 are divergent, and a same reinforcement ring 120 is fixedly connected between the outward ends of the plurality of fixing rods 110;

[0029] In this embodiment, the reinforcement ring 120 can improve the structural strength of the base frame 100 .

[0030] In one embodiment, see Figure 1 and Figure 4 The bottom of the outer cylinder 200 is fixedly connected to the center of the top of the base frame 100, the plurality of strip-shaped through holes 210 correspond to the plurality of fixed rods 110, and the bottoms of the plurality of push strips 300 are slidably connected to the plurality of slide grooves 111;

[0031] In this embodiment, the bottom of the push bar 300 is slidably connected to the sliding groove 111 , and the sliding groove 111 can limit the push bar 300 to always be perpendicular to the top of the fixing rod 110 .

[0032] In one embodiment, see Figure 1-Figure 4 The top end of the screw 400 is rotatably connected to the top inner wall of the outer cylinder 200, and the bottom end of the screw 400 is rotatably connected to the top center of the base frame 100 and penetrates to the bottom side of the base frame 100. The pushing member 500 includes a screw sleeve 510 and a plurality of connecting rods 520. The screw sleeve 510 is sleeved on the outside of the screw 400, and a plurality of connecting rods 520 are evenly distributed on the outside of the screw sleeve 510. The connecting rod 520 is rotatably connected to the outside of the pushing member 500, and the other end of the connecting rod 520 is rotatably connected to the inner side of the adjacent push strip 300. The motor 600 is installed at the bottom of the base frame 100 and adapted to the bottom end of the screw 400.

[0033] In this embodiment, the sleeve 510 is threadedly connected to the screw 400. When the screw 400 rotates, the bottom of the push bar 300 is restricted, so it is further restricted by the connecting rod 520 so that the sleeve 510 can only move up and down outside the screw 400. When the sleeve 510 moves downward, it drives the connecting rod 520 to expand outward, thereby pushing the push bar 300 to contact the workpiece. On the contrary, when the sleeve 510 moves downward, it drives the connecting rod 520 to shrink inward.

[0034] In one embodiment, see Figure 1 、 Figure 2 、 Figure 4 The output shaft of the motor 600 and the bottom end of the screw 400 are fixedly connected to the bevel gear 700, and the two bevel gears 700 are meshed;

[0035] In this embodiment, the motor 600 drives the screw 400 to rotate by driving the bevel gears 700 to mesh with each other.

[0036] In one embodiment, see Figure 1 , a support frame 800 is provided at the bottom of the base frame 100, and a plurality of fastening screws 810 are provided at the bottom of the support frame 800;

[0037] In this embodiment, the support frame 800 can be connected to the corresponding support platform by fastening screws 810.

[0038] In one embodiment, see Figure 1 , the top of the outer cylinder 200 is semicircular;

[0039] In this embodiment, the semicircular top of the outer cylinder 200 improves the convenience of loading.

[0040] In one embodiment, see Figure 1 and Figure 4 , the push strip 300 is provided with a rubber sheet 900 on the outward side;

[0041] In this embodiment, the rubber sheet 900 can increase the friction between the rubber sheet 900 and the workpiece.

[0042] In order to better understand the present invention, the following Figures 1 to 4The technical solution of the present invention is described in detail: one end of the workpiece to be fixed is aligned with the outer cylinder 200, and is sleeved on the outside of the outer cylinder 200, and the motor 600 is started. The motor 600 drives the screw 400 to rotate by driving the bevel gears 700 to engage with each other, and the screw sleeve 510 is threadedly connected to the screw 400. When the screw 400 rotates, the bottom of the push strip 300 is restricted, so it is further restricted by the connecting rod 520 to only move up and down outside the screw 400. When the screw sleeve 510 moves downward, it drives the connecting rod 520 to expand outward, thereby pushing the push strip 300 to contact the workpiece. On the contrary, when the screw sleeve 510 moves downward, it drives the connecting rod 520 to shrink inward. In this device, the screw 400 stops rotating, the screw sleeve 510 maintains its current position, and the screw 400 rotates, and the screw sleeve 510 moves with it. There is no transmission virtual position between the two, thereby ensuring the clamping accuracy.

[0043] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A self-centering fixture, characterized in that: include: chassis; An outer cylinder, the outer cylinder is arranged on the base frame, and a plurality of strip-shaped through holes are evenly opened on the outer wall of the outer cylinder along the axial direction; Push strips, the push strips are arranged in a plurality of the strip-shaped through holes; A screw rod, the screw rod being arranged in the outer barrel; Pushing members, the pushing members are sleeved on the outside of the screw rod in pairs, and the outer side of the pushing members is connected to the inner side of the pushing strip; and A motor is used to drive the screw rod to drive the pusher to move up and down and push the push strip.

2. A self-centering fixture according to claim 1, characterized in that: A plurality of fixing rods are arranged on the outside of the base frame, the fixing rods are divergent, the tops of the fixing rods are provided with sliding grooves, and the outward ends of the fixing rods are fixedly connected with a same reinforcing ring.

3. A self-centering fixture according to claim 2, characterized in that: The bottom of the outer cylinder is fixedly connected to the center of the top of the base frame, a plurality of the strip-shaped through holes correspond to a plurality of fixed rods respectively, and the bottoms of a plurality of push strips are slidably connected to a plurality of the slide grooves respectively.

4. A self-centering fixture according to claim 1, characterized in that: The top end of the screw is rotatably connected to the top inner wall of the outer cylinder, and the bottom end of the screw is rotatably connected to the top center of the bottom frame and penetrates to one side of the bottom of the bottom frame.

5. A self-centering fixture according to claim 4, characterized in that: The pushing member includes a screw sleeve and a plurality of connecting rods. The screw sleeve is sleeved on the outside of the screw rod. The plurality of connecting rods are evenly distributed on the outside of the screw sleeve. The connecting rods are rotationally connected to the outside of the pushing member, and the other ends of the connecting rods are rotationally connected to the inner sides of adjacent push strips.

6. A self-centering fixture according to claim 1, characterized in that: The motor is mounted on the bottom of the base frame and is matched with the bottom end of the screw rod.

7. A self-centering fixture according to claim 6, characterized in that: The output shaft of the motor and the bottom end of the screw are both fixedly connected to bevel gears, and the two bevel gears are meshed.

8. A self-centering fixture according to claim 1, characterized in that: A supporting frame is arranged at the bottom of the base frame, and a plurality of fastening screws are arranged at the bottom of the supporting frame.

9. A self-centering fixture according to claim 1, characterized in that: The top of the outer cylinder is semicircular.

10. A self-centering fixture according to claim 1, characterized in that: A rubber sheet is arranged on the outward side of the push strip.

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