Swing arm type clamping mechanism and pneumatic front chuck

Abstract

The clamping mechanism comprises a chuck body, a rotating sleeve and a rotary supporting ring, four sets of clamping jaw assemblies which are arranged in a sliding mode in the radial direction are evenly arranged at the front end of the chuck body in the circumferential direction, and clamping driving assemblies which are arranged corresponding to the clamping jaw assemblies are arranged at the rear end of the chuck body. Each clamping driving assembly comprises a positioning shaft and a gear shaft which are fixedly and rotationally vertically installed between the chuck body and the rotary supporting ring, a synchronous gear ring meshed with the gear shaft is arranged between the two symmetrically-arranged clamping driving assemblies, an air cylinder is rotationally arranged on the positioning shaft, and a connecting rod is hinged to the end of a piston rod of the air cylinder. The other end of the connecting rod is fixedly connected with a gear shaft, the front end of the gear shaft is fixedly connected with a driving arm, and the other end of the driving arm is inserted into the clamping jaw assembly and movably connected with the clamping jaw assembly to drive the clamping jaw assembly to move. According to the utility model, the problem of air leakage is effectively avoided while the clamping precision and the clamping stability of the chuck are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chucks, in particular to a swing arm type clamping mechanism and a pneumatic front chuck. Background Art

[0002] As an important accessory of laser cutting equipment, pneumatic chuck is used to clamp and transfer pipes and profiles of various materials, so as to realize pipe and profile processing. Conventional pneumatic chucks on the market include a base, a chuck body and a gas distribution assembly rotatably arranged at the front and rear ends of the base, which are connected by a rotating sleeve in the middle. A claw assembly is arranged at the front end of the chuck body, and a pneumatic clamping drive assembly is arranged at the rear end. The external air source and the clamping drive assembly are connected through the gas distribution assembly, thereby providing power for the pneumatic chuck and driving the claw assembly to realize the clamping function.

[0003] The Chinese utility model with the authorization announcement number CN 212885104 U discloses a front-mounted pneumatic chuck with a pre-installed reducer, wherein the clamping drive assembly adopts two gear rings and four groups of cylinders evenly arranged around the two gear rings, wherein two symmetrically arranged cylinders are connected to the same gear ring, and a passive gear is connected between the gear ring and the symmetrically arranged slider, thereby forming a group of synchronous drive assemblies to achieve synchronous movement of the two sliders, thereby achieving the clamping function. During the processing process, due to the influence of vibration, the meshing tooth gap between the gears will change, resulting in deviation in the moving distance of the claw assembly and low clamping accuracy. At the same time, since the cylinder is fixed, the cylinder is easily leaked due to the long-term lateral force during the reciprocating telescopic movement of the piston rod, affecting the normal use of the chuck. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and propose a swing arm type clamping mechanism and a pneumatic front chuck, which can effectively avoid the problem of air leakage while improving the clamping accuracy and clamping stability of the chuck.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A swing-arm type clamping mechanism comprises a chuck body, a rotating sleeve and a rotating support ring which are coaxially fixedly connected in sequence from front to back, the front end of the chuck body is evenly provided with four groups of claw assemblies which are radially slidably arranged along the circumferential direction, and the rear end is provided with four clamping drive assemblies which are arranged corresponding to the claw assemblies, the clamping drive assembly comprises a positioning shaft and a gear shaft which are respectively fixedly and rotatably installed vertically between the chuck body and the rotating support ring, a synchronous gear ring which is meshed with the gear shaft is provided between the two symmetrically arranged clamping drive assemblies, a cylinder is rotatably provided on the positioning shaft, a connecting rod is hinged at the end of the piston rod of the cylinder, the other end of the connecting rod is fixedly connected to the gear shaft, the front end of the gear shaft is fixedly connected with a driving arm, the other end of the driving arm is inserted in the claw assembly and movably connected to the claw assembly to drive the claw assembly to move.

[0007] Furthermore, the front end surface of the chuck body is evenly provided with four first radially arranged grooves, the claw assembly includes a slider assembly and a claw fixedly installed on the slider assembly, the slider assembly includes a slide plate slidably arranged in the first slide groove, the front end of the slide plate is fixedly stacked with a mounting block, the mounting block is provided with an avoidance groove on the side close to the slide plate, a rotating pin that can move along the tangential direction of the chuck is connected between the avoidance groove and the slide plate, and the other end of the driving arm is rotatably connected to the rotating pin.

[0008] Furthermore, a waist-shaped groove is provided in the avoidance groove, a waist-shaped hole corresponding to the waist-shaped groove is provided on the skateboard, a bottom plate covering the waist-shaped hole is fixedly provided at the rear end of the skateboard, and both ends of the rotating pin are respectively inserted into the waist-shaped groove and the waist-shaped hole.

[0009] Furthermore, pressure blocks fixedly mounted on the chuck body are symmetrically provided on both sides of the clamping claws, and dustproof plates which can be extended and retracted along the radial direction of the chuck are fixedly connected to one end of the two pressure blocks away from the center of the chuck.

[0010] Furthermore, the dustproof plate includes a first baffle fixedly connected to the two pressure blocks and a plurality of second baffles radially slidingly arranged between the two pressure blocks along the chuck and axially arranged along the chuck, and the second baffle at the end is connected to the mounting block, the first baffle and the second baffle are provided with a first bent portion bent backward on the side close to the center of the chuck, and the second baffle is provided with a second bent portion bent forward on the side away from the center of the chuck, and the front end surface of the second bent portion is higher than the rear end surface of the first bent portion.

[0011] Furthermore, the synchronous gear ring includes a synchronous ring body and a first sector-shaped gear tooth symmetrically arranged on the outer peripheral surface of the synchronous ring body, the gear shaft includes an integrally formed rotating shaft and a gear body, and the gear body is provided with a second sector-shaped gear tooth meshing with the first sector-shaped gear tooth on one side close to the synchronous gear ring.

[0012] A pneumatic front chuck comprises a base, a bearing, a driven gear ring, a gas distribution assembly and the clamping mechanism as described above, wherein the clamping mechanism and the driven gear ring are coaxially rotatably mounted on the front and rear sides of the base through bearings, respectively, and the gas distribution assembly is arranged on the rear side of the driven gear ring and is suitable for connecting the cylinder and an external air source.

[0013] Furthermore, the driven gear ring outer cover is provided with a shell, the shell is adjustably mounted on the base along the circumferential direction by screws, a reducer is pre-installed on the outer circumferential surface of the shell, and the output end of the reducer is provided with a driving gear meshing with the driven gear ring.

[0014] Furthermore, the valve distribution assembly includes a sealing ring with an air hole and a sealing support ring and a sealing cover plate fixedly connected to the driven gear ring and the housing respectively, the front end face of the sealing cover plate is coaxially provided with two annular grooves with a T-shaped cross-section, the sealing ring is arranged in the annular groove along the axial gap, and the rear end face of the driven gear ring is provided with a double annular boss extending into the annular groove.

[0015] By adopting the above technical solution, the utility model has the following beneficial effects:

[0016] (1) The utility model replaces the existing gear transmission connection between the claw assembly and the clamping drive assembly by providing a driving arm that is inserted into the claw assembly and movably connected thereto, thereby avoiding the problem of deviation in the moving distance of the claw assembly caused by changes in the meshing tooth gap between the gears due to the influence of vibration, thereby improving the clamping accuracy and clamping stability of the chuck. At the same time, the fixed cylinder is optimized to be rotatably installed between the chuck body and the rotary support ring through the positioning shaft, so that the rear end of the cylinder releases the rotational freedom, thereby avoiding the problem of cylinder leakage caused by the cylinder piston rod being subjected to long-term lateral force during movement.

[0017] (2) The utility model provides a space for the movement of the driving arm by setting an avoidance groove to avoid interference, and connects the driving arm and the slider assembly through a movable rotating pin, so that the driving arm can rotate to drive the claw assembly to slide radially along the chuck. The structure is simple and the transmission is reliable.

[0018] (3) The utility model optimizes the traditional integrated sliding block structure into a layered sliding block assembly consisting of a slide plate, a mounting block and a base plate, which is easy to assemble. The corresponding waist-shaped grooves and waist-shaped holes can realize the movement of the rotating pin along the length direction of the waist-shaped hole under external force.

[0019] (4) The utility model can effectively prevent debris from entering the sliding assembly or the first sliding groove when the pipe is cut by providing a retractable dustproof plate, thereby ensuring smooth clamping action.

[0020] (5) The dustproof plate of the utility model adopts a multi-layer stepped structure, namely a first baffle plate and a plurality of second baffle plates. By setting a first bending portion and a second bending portion that cooperate with each other, when the claw assembly moves toward the center of the chuck, the baffle plates follow the movement of the claw assembly and open in sequence, and vice versa. The structure is simple, as shown in the traditional accordion cover dustproof structure. The surface is smoother and not easy to accumulate debris. At the same time, when adjacent baffle plates slide relative to each other, the debris falling on the surface can also be scraped off, further improving the dustproof effect.

[0021] (6) The synchronous gear ring and the gear shaft of the utility model are both incomplete gears, that is, sector-shaped gear teeth, which reduces the manufacturing cost.

[0022] (7) The chuck of the utility model adopts the clamping mechanism with the above-mentioned optimized structure, which can effectively avoid the problem of cylinder leakage while improving the clamping accuracy and clamping stability of the chuck.

[0023] (8) The utility model adopts an integrated shell fixed on the base of the chuck, providing installation space for the reducer and the driving gear, which can solve the problems of installation and debugging, dust prevention, and lubrication, and improve assembly accuracy and service life.

[0024] (9) The gas distribution assembly of the utility model is integrated with the driven gear ring, which reduces the number of chuck parts and the axial size of the chuck, thereby reducing the length of excess material when cutting the pipe and reducing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 It is a three-dimensional diagram of the utility model;

[0027] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0028] Figure 3 for Figure 2 A local enlarged view of point A in FIG.

[0029] Figure 4 It is a structural schematic diagram of the clamping drive assembly of the utility model.

[0030] The reference numerals in the accompanying drawings are:

[0031] Base 1, bearing 2, driven gear ring 3, gas distribution assembly 4, sealing ring 4-1, sealing support ring 4-2, sealing cover plate 4-3, chuck body 5, rotating sleeve 6, slewing support ring 7, claw assembly 8, claw 8-1, slide plate 8-2, waist hole 8-2-1, mounting block 8-3, avoidance groove 8-4, waist groove 8-4-1, rotating pin 8-5, bottom plate 8-6, clamping drive assembly 9, positioning shaft 9-1, gear shaft 9-2, rotating shaft 9-2-1, gear body 9-2-2, synchronous gear ring 9-3, synchronous ring body 9-3-1, first sector gear 9-3-2, cylinder 9-4, connecting rod 9-5, driving arm 9-6, housing 10, reducer 11, pressing block 12, dustproof plate 13, first baffle 13-1, second baffle 13-2, first bending portion 13-3, second bending portion 13-4. DETAILED DESCRIPTION

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] (Example 1)

[0034] like Figures 1 to 4 The pneumatic front chuck shown comprises a base 1, a bearing 2, a driven gear ring 3, an air distribution assembly 4 and a clamping mechanism. The clamping mechanism and the driven gear ring 3 are respectively coaxially rotatably mounted on the front and rear sides of the base 1 through the bearing 2. The clamping mechanism comprises a chuck body 5, a rotating sleeve 6 and a slewing support ring 7 which are coaxially fixedly connected from front to back. The front end of the chuck body 5 is evenly provided with four groups of claw assemblies 8 which are radially slidably arranged along the circumferential direction, and the rear end is provided with four clamping drive assemblies 9 which are arranged corresponding to the claw assemblies 8. The air distribution assembly 4 is arranged at the rear side of the driven gear ring 3, connected to an external air source, and supplies air to the clamping drive assembly 9 to realize the clamping function.

[0035] Specifically, the outer cover of the driven gear ring 3 is provided with a shell 10 installed on the base 1, and a reducer 11 is pre-installed on the outer circumferential surface of the shell 10. The output end of the reducer 11 is provided with a driving gear meshing with the driven gear ring 3. The integrated shell structure is adopted to provide installation space for the reducer and the driving gear, which can solve the installation and debugging, dust prevention, and lubrication problems, and improve the assembly accuracy and service life. The shell 10 is installed on the base 1 by screws, and the screws are evenly arranged along the circumference to achieve the circumferential adjustment of the shell 10. When in use, the position of the reducer on the shell can be reasonably adjusted according to the position of the pipe cutting machine, and the versatility is better. The driving gear is driven to rotate by the reducer, and then the driven gear ring is driven to rotate, so as to realize the rotation function of the clamping mechanism.

[0036] The gas distribution assembly 4 includes a sealing ring 4-1 with air holes, a sealing support ring 4-2 and a sealing cover plate 4-3 fixedly connected to the driven gear ring 3 and the housing 10 respectively. The front end face of the sealing cover plate 4-3 is coaxially provided with two annular grooves with a T-shaped cross section. The sealing ring 4-1 is arranged in the annular groove along the axial gap. The rear end face of the driven gear ring 3 is provided with a double annular boss 3-1 extending into the annular groove. The specific gas path structure is the same as the prior art and will not be repeated here. By integrating the gas distribution assembly 4 with the driven gear ring 3, the number of chuck parts is reduced while reducing the axial size of the chuck, thereby reducing the excess length of the pipe when cutting the pipe and reducing the waste of the pipe.

[0037] The clamping drive assembly 9 includes a positioning shaft 9-1 and a gear shaft 9-2 which are respectively fixedly and rotatably mounted vertically between the chuck body 5 and the rotary support ring 7; a synchronous gear ring 9-3 which is meshed with the gear shaft 9-2 is provided between the two symmetrically arranged clamping drive assemblies 9; a cylinder 9-4 is rotatably provided on the positioning shaft 9-1; a connecting rod 9-5 is hinged at the end of the piston rod of the cylinder 9-4; the other end of the connecting rod 9-5 is fixedly connected to the gear shaft 9-2; and a driving arm 9-6 is fixedly connected to the front end of the gear shaft 9-2.

[0038] The front end surface of the chuck body 5 is evenly provided with four first sliding grooves arranged in the radial direction. The claw assembly 8 includes a slider assembly and a claw 8-1 fixedly installed on the slider assembly. The slider assembly includes a slide plate 8-2 slidably arranged in the first sliding groove. The front end of the slide plate 8-2 is fixedly stacked with a mounting block 8-3. The mounting block 8-3 is provided with an avoidance groove 8-4 on the side close to the slide plate 8-2. The avoidance groove 8-4 is provided with a waist-shaped groove 8-4-1. The slide plate 8-2 is provided with a waist-shaped hole 8-2-1 corresponding to the waist-shaped groove 8-4-1. A rotating pin 8-5 is connected between the avoidance groove 8-4 and the slide plate 8-2. The two ends of the rotating pin 8-5 are respectively inserted in the waist-shaped groove 8-4-1 and the waist-shaped hole 8-2-1. The rear end of the slide plate 8-2 is fixedly provided with a bottom plate 8-6 covering the waist-shaped hole 8-2-1. The other end of the driving arm 9-6 is inserted in the avoidance groove 8-4 and is rotatably connected with the rotating pin 8-5.

[0039] The synchronous gear ring 9-3 includes a synchronous ring body 9-3-1 and first sector-shaped gear teeth 9-3-2 symmetrically arranged on the outer peripheral surface of the synchronous ring body 9-3-1. The gear shaft 9-2 includes an integrally formed rotating shaft 9-2-1 and a gear body 9-2-2. The gear body 9-2-2 is provided with a second sector-shaped gear tooth meshing with the corresponding first sector-shaped gear tooth 9-3-2 on one side close to the synchronous gear ring 9-3.

[0040] The cylinder 9-4 drives the connecting rod 9-5 to drive the gear shaft 9-2 to rotate, thereby realizing the synchronous movement of the symmetrical clamping drive assembly 9 through the synchronous gear ring 9-3, and at the same time drives the driving arm 9-6 to rotate, thereby driving the slider assembly to move radially along the chuck to realize the clamping function of the claw 8-1. By setting a driving arm inserted into the claw assembly and movably connected to it to replace the existing gear transmission connection between the claw assembly and the clamping drive assembly, the problem of the deviation of the moving distance of the claw assembly caused by the change of the meshing tooth gap between the gears due to the influence of vibration is avoided, thereby improving the clamping accuracy and clamping stability of the chuck, and at the same time, the fixed cylinder is optimized to be rotatably installed between the chuck body and the slewing support ring through the positioning shaft, so that the rear end of the cylinder releases the rotational freedom, avoiding the problem of cylinder leakage caused by the cylinder piston rod being subjected to lateral force for a long time during movement.

[0041] The two sides of the clamping claw 8-1 are symmetrically provided with pressure blocks 12 fixedly mounted on the chuck body 5. The ends of the two pressure blocks 12 away from the center of the chuck are fixedly connected with dust-proof plates 13 that can be extended and retracted along the radial direction of the chuck, which can effectively prevent debris from entering the sliding assembly or the first slide groove during pipe cutting, and ensure smooth clamping action. Specifically, the dust-proof plate 13 includes a first baffle 13-1 fixedly connected to the two pressure blocks 12 and a plurality of second baffles 13-2 that are radially slidably arranged between the two pressure blocks 12 and arranged along the axial direction of the chuck. The second baffle 13-2 at the end is connected to the mounting block 8-3. The first baffle 13-1 and the second baffle 13-2 are provided with a first bending portion 13-3 that is bent backward on the side close to the center of the chuck, and the second baffle is provided with a second bending portion 13-4 that is bent forward on the side away from the center of the chuck. The front end surface of the second bending portion 13-4 is higher than the rear end surface of the first bending portion 13-3. By adopting a multi-layer stepped dustproof plate structure, in practice, by protruding the end of the mounting screw located at the end of the mounting block 8-3 from the surface of the mounting block, and by providing a first bending portion and a second bending portion that cooperate with each other, when the claw assembly moves toward the center of the chuck, the baffles follow the movement of the claw assembly and open in sequence, and vice versa, fold in sequence. The structure is simple, as shown in the traditional accordion cover dustproof structure. The surface is smoother and not easy to accumulate debris. At the same time, when adjacent baffles slide relative to each other, the debris falling on the surface can also be scraped off, further improving the dustproof effect.

[0042] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A swing arm type clamping mechanism, characterized in that: It includes a chuck body, a rotating sleeve and a rotating support ring which are coaxially fixedly connected in sequence from front to back, the front end of the chuck body is evenly provided with four groups of claw assemblies arranged along the radial sliding direction along the circumferential direction, and the rear end is provided with four clamping drive assemblies arranged corresponding to the claw assemblies, the clamping drive assembly includes a positioning shaft and a gear shaft which are respectively fixed and rotatably installed vertically between the chuck body and the rotating support ring, a synchronous gear ring which is meshed with the gear shaft is provided between the two symmetrically arranged clamping drive assemblies, a cylinder is rotatably provided on the positioning shaft, a connecting rod is hinged at the end of the piston rod of the cylinder, the other end of the connecting rod is fixedly connected to the gear shaft, the front end of the gear shaft is fixedly connected with a driving arm, the other end of the driving arm is inserted in the claw assembly and movably connected to the claw assembly to drive the claw assembly to move.

2. The swing arm clamping mechanism according to claim 1, characterized in that: The front end surface of the chuck body is evenly provided with four first sliding grooves arranged in the radial direction. The claw assembly includes a slider assembly and a claw fixedly installed on the slider assembly. The slider assembly includes a slide plate slidably arranged in the first sliding groove. A mounting block is fixedly stacked on the front end of the slide plate. An avoidance groove is provided on the side of the mounting block close to the slide plate. A rotating pin that can move along the tangential direction of the chuck is connected between the avoidance groove and the slide plate. The other end of the driving arm is rotatably connected to the rotating pin.

3. The swing arm clamping mechanism according to claim 2, characterized in that: A waist-shaped groove is provided in the avoidance groove, a waist-shaped hole corresponding to the waist-shaped groove is provided on the slide plate, a bottom plate covering the waist-shaped hole is fixedly provided at the rear end of the slide plate, and both ends of the rotating pin are respectively inserted into the waist-shaped groove and the waist-shaped hole.

4. The swing arm clamping mechanism according to claim 2, characterized in that: The two sides of the clamping claws are symmetrically provided with pressure blocks fixedly mounted on the chuck body, and one end of the two pressure blocks away from the center of the chuck is fixedly connected with a dustproof plate which can be extended and retracted along the radial direction of the chuck.

5. The swing arm type clamping mechanism according to claim 4, characterized in that: The dustproof plate includes a first baffle fixedly connected to the two pressure blocks and a plurality of second baffles radially slidingly arranged between the two pressure blocks along the chuck and arranged axially along the chuck, and the second baffle at the end is connected to the mounting block, the first baffle and the second baffle are provided with a first bent portion bent backward on the side close to the center of the chuck, and the second baffle is provided with a second bent portion bent forward on the side away from the center of the chuck, and the front end surface of the second bent portion is higher than the rear end surface of the first bent portion.

6. The swing arm type clamping mechanism according to claim 1, characterized in that: The synchronous gear ring includes a synchronous ring body and first sector-shaped gear teeth symmetrically arranged on the outer peripheral surface of the synchronous ring body. The gear shaft includes an integrally formed rotating shaft and a gear body. The side of the gear body close to the synchronous gear ring is provided with second sector-shaped gear teeth meshing with the first sector-shaped gear teeth.

7. A pneumatic front chuck, characterized in that: It comprises a base, a bearing, a driven gear ring, a gas distribution assembly and a clamping mechanism as described in any one of claims 1 to 6, wherein the clamping mechanism and the driven gear ring are coaxially rotatably mounted on the front and rear sides of the base through bearings, respectively, and the gas distribution assembly is arranged on the rear side of the driven gear ring and is suitable for connecting the cylinder and an external air source.

8. A pneumatic front chuck according to claim 7, characterized in that: The driven gear ring outer cover is provided with a shell, and the shell is adjustably mounted on the base along the circumferential direction by screws. A reducer is pre-installed on the outer circumferential surface of the shell, and the output end of the reducer is provided with a driving gear meshing with the driven gear ring.

9. A pneumatic front chuck according to claim 8, characterized in that: The valve distribution assembly includes a sealing ring with an air hole, and a sealing support ring and a sealing cover plate fixedly connected to the driven gear ring and the housing respectively. The front end face of the sealing cover plate is coaxially provided with two annular grooves with T-shaped cross-sections. The sealing ring is arranged in the annular groove along the axial gap, and the rear end face of the driven gear ring is provided with a double annular boss extending into the annular groove.

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