Clamping mechanism capable of achieving self-locking in case of gas cut-off

Abstract

The utility model provides a clamping mechanism capable of self-locking during gas cut-off, which comprises a fixedly arranged limiting disc and a rotating disc capable of rotating relative to the limiting disc, a cam groove with a curved surface guide track is arranged on the rotating disc, a limiting groove extending in the radial direction is arranged on the limiting disc, and a movable clamping jaw is respectively connected with the limiting groove and the cam groove in a matched mode through a sliding block and a cam bearing. And a curved surface guide track on the rotating disc is converted into a radial movement track of the clamping jaws. Meanwhile, an air cylinder and an elastic piece are further arranged, the air cylinder drives the rotating disc to rotate in the forward direction in the inflated state, and elastic potential energy is stored by the elastic piece; when the air cylinder is cut off, the elastic piece releases the elastic potential energy to drive the rotating disc to return to the initial position, and the materials are clamped. The clamp is simple in design, ingenious in structure, easy to debug and convenient to maintain, the clamping function of the clamp is achieved through a simple cam matching structure, the occupied space is small, and the practical value is high.

Description

Technical Field

[0001] The utility model relates to a pneumatic clamping component, in particular to a clamping mechanism with air cut-off self-locking function. Background Art

[0002] Pneumatic fixtures are common processing equipment in industrial production. Gas is filled into the fixture, and the clamping jaws are pushed by the gas to move to clamp the material. However, the clamping function of common pneumatic fixtures depends on the power of the gas source. Once the power input cannot be maintained, it may affect the clamping ability of the material. Especially in the event of an accidental gas cut-off of the gas source, the clamping jaws will loosen and the material will fall, which has a certain safety risk. At the same time, for some clamping devices that require multiple angles, multiple gas sources often need to be set, which occupies a large space and has a high cost.

[0003] Therefore, it is necessary to improve the existing pneumatic equipment. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a clamping mechanism with air cut-off self-locking function, which includes a bracket, a mandrel passing through the center of the bracket, a rotating disk and a limiting disk coaxially sleeved on the mandrel, and a plurality of moving clamping jaws arranged circumferentially along the end face of the limiting disk;

[0005] A plurality of limiting grooves extending radially are arranged circumferentially on the end face of the limiting disk, and the moving clamping jaws are connected to the sliders arranged in the limiting grooves;

[0006] A plurality of cam grooves with curved guiding tracks are arranged circumferentially on the end face of the rotating disk. The rear end of the moving clamping jaw is provided with a cam bearing for cooperating with the cam groove. The fixed end of the cam bearing is connected to the slider, and the cam end of the cam bearing is arranged in the cam groove;

[0007] The bracket is also provided with a cylinder for providing positive rotation power for the rotating disk and an elastic member for providing damping for the positive rotation of the rotating disk;

[0008] The positive rotation power drives the cam end of the cam bearing to move between a first position c close to the center of the circle and a second position d close to the circumference along the guiding track, and at the same time drives the slider to move from the pressing position a of the automatic clamping jaw to the releasing position b along the limiting groove.

[0009] Furthermore, the elastic member stores elastic potential energy when the rotating disk rotates positively, and releases the elastic potential energy after the positive rotation power disappears, driving the slider to return from the releasing position b of the automatic clamping jaw to the pressing position a along the limiting groove.

[0010] Furthermore, a driving disk is coaxially and fixedly arranged at one end of the rotating disk away from the limiting disk. Two groups of driving blocks are arranged on the peripheral wall of the driving disk. The piston shaft of the cylinder presses against one group of driving blocks, and one end of the elastic member is connected to the other group of driving blocks.

[0011] Further, the two sets of driving blocks are symmetrically arranged with respect to the center axis of the rotating disk.

[0012] Further, the driving disk is fixedly connected to the rotating disk by threads.

[0013] Further, the elastic member is a tension spring.

[0014] Further, a ball bearing is connected between the mandrel and the rotating disk.

[0015] Further, the forward rotation power drives the cam end of the cam bearing to move from the first position c near the center of the circle to the second position d near the circumference along the guiding track.

[0016] Further, a plurality of static clamping jaws are arranged on the end face of the first connecting disk along the circumferential direction corresponding to each group of moving clamping jaws, and a group of moving clamping jaws and a group of static clamping jaws form a group of clamping assemblies.

[0017] Further, one end of the mandrel protrudes in the circumferential direction to be provided with a first connecting disk and fixedly connects to the end face of the limiting disk by a threaded connection method.

[0018] The utility model provides a clamping mechanism with air cut-off self-locking, including a fixed limiting disk and a rotating disk capable of rotating relative to the limiting disk. A cam groove with a curved surface guiding track is arranged on the rotating disk, and a limiting groove extending radially is arranged on the limiting disk. The moving clamping jaws are respectively connected in cooperation with the limiting groove and the cam groove through sliders and cam bearings, and the curved surface guiding track on the rotating disk is converted into a radial moving track of the clamping jaws. At the same time, a cylinder and an elastic member are also provided. When the cylinder is in the inflated state, it drives the rotating disk to rotate forward and enables the elastic member to store elastic potential energy; when the cylinder cuts off the air, the elastic member releases the elastic potential energy and drives the rotating disk back to the initial position to realize the clamping of the material.

[0019] The design is simple, the structure is ingenious, the debugging is simple, and the maintenance is convenient. The clamping function of the fixture is realized through a simple cam matching structure, and there is only one cylinder as the active driving element, which occupies a small space and has high practical value. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a clamping mechanism with air cut-off self-locking of the utility model in the direction of the rotating disk;

[0021] Figure 2 is a schematic structural diagram of a clamping mechanism with air cut-off self-locking of the utility model in the direction of the limiting disk;

[0022] Figure 3 is an exploded view of the utility model;

[0023] Figure 4 is a cross-sectional view of the utility model;

[0024] Figure 5 It is a schematic diagram of the connection of the cam bearing, slider and moving jaw;

[0025] Figure 6 It is a schematic diagram of the positions of the static jaw and the moving jaw;

[0026] Figure 7 It is a schematic diagram of the connection of the slider and the limit disk;

[0027] Figure 8 It is a schematic diagram of the cylinder driving the rotating disk to rotate;

[0028] Figure 9 It is a schematic diagram of the cam bearing moving along the cam groove.

[0029] Reference numerals: bracket 1, mandrel 2, rotating disk 3, limit disk 4, moving jaw 5, cylinder 6, elastic member 7, driving disk 8, limit groove 9, cam groove 10, slider 11, cam bearing 12, static jaw 13, first connecting disk 14, ball bearing 15, second connecting disk 16, driving block 17, inflation port 18, piston shaft 19;

[0030] Pressing position a, releasing position b, first position c, second position d. Detailed implementation manners

[0031] As Figures 1 to 4 shown, a gas cut-off self-locking clamping mechanism includes a bracket 1, a mandrel 2 provided at the center of the bracket 1, a rotating disk 3 and a limit disk 4 sleeved on the mandrel 2. The bracket 1 is hollow, the rotating disk 3 and the limit disk 4 are both arranged in the hollow through hole of the bracket 1, and the mandrel 2 is coaxially arranged with the hollow through hole, so that the centers of the rotating disk 3, the limit disk 4 and the mandrel 2 are on the same axis.

[0032] The front and rear end faces of the limit disk 4 are provided with connection holes and are fixed to the bracket 1 by means of threaded connection. One end of the mandrel 2 protrudes in the circumferential direction to form a first connecting disk 14 and is also fixedly connected to the end face of the limit disk 4 by means of threaded connection, so that the mandrel 2 and the limit disk 4 form a relatively fixed whole.

[0033] The purpose of this embodiment is to construct a clamping structure whose clamping direction moves towards the center of the bracket 1, and the clamping object is an annular material. Therefore, four static jaws 13 are arranged in the circumferential direction on the end face of the first connecting disk 14, and a moving jaw 5 capable of moving relative to the static jaw 13 in the radial direction of the limit disk 4 is arranged on the side of each static jaw 13. The end face of the static jaw 13 is provided with a position for fixing the flange of the annular material, and then the moving jaw 5 moves towards the static jaw 13 to clamp the edge of the material. The direction towards the center of the circle is the pressing position a for clamping the material, and the direction towards the circumferential direction is the releasing position b for releasing the clamping state of the material.

[0034] As Figure 2 , Figure 8 and Figure 9 shown, the rotating disk 3 is also sleeved on the mandrel 2 and is driven by a cylinder 6 provided on the peripheral wall of the bracket 1 to rotate forward relative to the limiting disk 4. An elastic member 7 is simultaneously provided on the bracket 1. The elastic member 7 has a damping force opposite to the driving direction of the cylinder 6. When the piston shaft 19 of the cylinder 6 retracts, the rotating disk 3 is driven to rotate reversely relative to the limiting disk 4.

[0035] Furthermore, a ball bearing 15 is connected between the mandrel 2 and the rotating disk 3.

[0036] As Figure 8 shown, specifically in this embodiment, a driving disk 8 is coaxially provided at one end of the rotating disk 3 away from the limiting disk 4. A second connecting disk 16 protrudes from the center of the end of the limiting disk 4. The driving disk 8 is fixedly docked with the second connecting disk 16 by means of threaded fastening, so that the driving disk 8 and the limiting disk 4 move synchronously. Two groups of driving blocks 17 are provided on the circumferential wall of the driving disk 8. The cylinder 6 and the elastic member 7 drive the driving disk 8 or the rotating disk 3 to rotate through the driving blocks 17. Among them, the piston shaft 19 of the cylinder 6 presses against one group of driving blocks 17. When gas is injected into the gas inlet 18 of the cylinder 6, the piston shaft 19 of the cylinder 6 will push the driving block 17 to cause the driving block 17 to rotate; one end of the elastic member 7 is connected to the other group of driving blocks 17.

[0037] In this embodiment, the elastic member 7 is a tension spring, and the two groups of driving blocks 17 are symmetrically arranged with respect to the center axis of the rotating disk 3.

[0038] As Figures 5 to 9 shown, it further includes a matching structure for connecting the rotating disk 3, the limiting disk 4 and the moving jaw 5. The matching structure includes limiting grooves 9 arranged on the limiting disk 4 and cam grooves 10 arranged on the rotating disk 3. The limiting grooves 9 and the cam grooves 10 are arranged corresponding to the position of the moving jaw 5.

[0039] The limiting grooves 9 extend along the radial direction of the limiting disk 4. A slider 11 is slidably connected in the limiting grooves 9. The moving jaw 5 is fixedly connected to the slider 11 and is driven by the slider 11 to move between a pressurizing position a and a releasing position b.

[0040] The cam groove 10 has a curved surface guiding track. Along the guiding track, there is a first position c close to the center of the circle and a second position d close to the circumference. A cam bearing 12 for matching the cam groove 10 is provided at the rear end of the moving jaw 5. The fixed end of the cam bearing 12 is connected to the slider 11, and the cam end of the cam bearing 12 is arranged in the cam groove 10. When the rotating disk 3 rotates relative to the limiting disk 4, the cam bearing 12 moves between the first position c and the second position d along the cam groove 10.

[0041] In this embodiment, the clamping action is directed towards the center of the circle. The first position c corresponds to the pressing position a of the movable jaw 5, and the second position d corresponds to the releasing position b of the movable jaw 5. When the cam bearing 12 moves along the cam groove 10 to the first position c, the movable jaw 5 moves towards the center of the circle to the clamping position.

[0042] The working process of this embodiment is as follows: It is stipulated that the forward rotational power exerted on the rotating disk 3 when the air cylinder 6 is in the inflated state. When inflating the air inlet 18 of the air cylinder 6, the piston shaft 19 presses against one set of driving blocks 17, driving the driving disk 8 and the rotating plate to rotate forward relative to the limiting disk 4, and stretching the spring provided on the other set of driving blocks 17, so that the spring stores elastic potential energy in the reverse direction; the cam end of the cam bearing 12 moves from the first position c close to the center of the circle towards the second position d close to the circumference along the cam groove 10; and the fixedly arranged limiting groove 9 restricts the movement trajectory of the cam bearing 12, and the cam bearing 12 can only move in the radial direction, thereby driving the movable jaw 5 at the other end of the cam bearing 12 to move towards the releasing position b close to the circumference side, realizing the release of the clamping state of the material.

[0043] When it is necessary to clamp the product, the gas in the air cylinder 6 is extracted. The piston shaft 19 will stop pressing on the driving block 17. The spring releases elastic potential energy, pushing the driving disk 8 and the rotating plate to rotate in the reverse direction relative to the limiting disk 4, driving the cam bearing 12 to return to the first position c, and then driving the movable jaw 5 to move to the pressing position a to clamp the material. Thus, it can be seen that this embodiment can achieve clamping of the product in the state of cut-off air supply.

[0044] It should be noted that the setting of the above-mentioned movable jaw 5 and the static jaw 13 only represents the description of the function of clamping the annular material in this embodiment. It can be foreseen that only setting the movable jaw 5 or a similar movable clamping mechanism can also achieve clamping of general materials.

[0045] In this embodiment, when the air cylinder 6 is in the state of cut-off air supply, the elastic member 7 will push the rotating disk 3 to rotate, and the cam bearing 12 moves inward from the second position d close to the circumference. Based on a similar principle, the present invention can be applied to a clamping mechanism or an inner support structure where the movable jaw 5 moves outward. For example, by reversing the relative directions of the first position c and the second position d, when the air cylinder 6 is in the state of cut-off air supply and the rotating disk 3 rotates in the reverse direction, the cam bearing 12 moves outward from the second position d close to the center of the circle, thereby realizing clamping of the product from the inner side direction of the product in the state of cut-off air supply.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A clamping mechanism with air-off self-locking, characterized in that: It comprises a bracket (1), a core shaft (2) passing through the center of the bracket, a rotating disk (3) and a limiting disk (4) coaxially sleeved on the core shaft, and a plurality of movable clamping jaws (5) arranged circumferentially along the end surface of the limiting disk (4); A plurality of radially extending limiting grooves (9) are arranged circumferentially on the end surface of the limiting plate (4), and the movable clamping jaw (5) is connected to a slider (11) arranged in the limiting groove (9); A plurality of cam grooves (10) having curved guide tracks are arranged circumferentially on the end surface of the rotating disk (3); a cam bearing (12) matching the cam groove (10) is provided at the rear end of the movable clamping jaw (5); a fixed end of the cam bearing (12) is connected to a slider (11); and a cam end of the cam bearing (12) is arranged in the cam groove (10); The support (1) is also provided with a cylinder (6) for providing positive rotational power for the rotating disk (3) and an elastic member (7) for providing damping for the positive rotation of the rotating disk (3); The positive rotational power drives the cam end of the cam bearing (12) to move along the guide track between a first position c close to the center of the circle and a second position d close to the circumference, and at the same time drives the slider (11) to move from the pressurized position a of the automatic clamp (5) along the limit groove (9) to the released position b.

2. A gas-cut-off self-locking clamping mechanism as claimed in claim 1, characterized in that: The elastic member (7) stores elastic potential energy when the rotating disk (3) rotates in the forward direction, and releases the elastic potential energy after the forward rotation power disappears, driving the slider (11) to return from the release position b of the automatic clamping claw (5) along the limiting groove (9) to the pressurized position a.

3. The gas-cut-off self-locking clamping mechanism according to claim 1, characterized in that: A driving disk (8) is coaxially fixedly arranged at one end of the rotating disk (3) away from the limiting disk (4); two groups of driving blocks (17) are arranged on the peripheral wall of the driving disk (8); the piston shaft (19) of the cylinder (6) presses against one group of driving blocks (17); and one end of the elastic member (7) is connected to the other group of driving blocks (17).

4. A gas-cut-off self-locking clamping mechanism as claimed in claim 3, characterized in that: The two groups of driving blocks (17) are symmetrically arranged relative to the central axis of the rotating disk (3).

5. The gas-cut-off self-locking clamping mechanism according to claim 3, characterized in that: The driving disc (8) is threadedly fixedly connected to the rotating disc (3).

6. The gas-cut-off self-locking clamping mechanism according to claim 1, characterized in that: The elastic member (7) is a tension spring.

7. The gas-cut-off self-locking clamping mechanism according to claim 1, characterized in that: A ball bearing (15) is connected between the core shaft (2) and the rotating disk (3).

8. The gas-cut-off self-locking clamping mechanism according to claim 1, characterized in that: The positive rotational power drives the cam end of the cam bearing (12) to move along a guide track from a first position c close to the center of the circle to a second position d close to the circumference.

9. A gas-cut-off self-locking clamping mechanism as claimed in claim 8, characterized in that: One end of the core shaft (2) is provided with a first connection disk (14) protruding in the circumferential direction, and the end surface of the first connection disk (14) is provided with a plurality of stationary clamping jaws (13) corresponding to each group of dynamic clamping jaws (5) along the circumferential direction, and a group of dynamic clamping jaws (5) and a group of stationary clamping jaws (13) form a clamping assembly.

10. The gas-cut-off self-locking clamping mechanism according to claim 1, characterized in that: One end of the core shaft (2) is protruded in the circumferential direction and is provided with a first connection disk (14) which is fixedly connected to the end surface of the limiting disk (4) by means of a threaded connection.

Images