Three-jaw pneumatic chuck and tire changer

Abstract

The utility model provides a three-jaw pneumatic chuck and a tire changer, the three-jaw pneumatic chuck comprises a chuck body, the chuck body is provided with three grooves, each of the three grooves penetrates through two opposite surfaces of the chuck body, and the axis of the chuck body is provided with a first through hole; the three clamping jaws are movably connected with the disc body through different grooves respectively; the rotating disc is located on the first surface of the disc body and rotatably connected with the disc body, a second through hole is formed in the axis of the rotating disc, the first through hole communicates with the second through hole, and three first mounting holes are formed in the rotating disc; the three pull rods are in one-to-one correspondence with the three first mounting holes, one end of each pull rod in the three pull rods is rotatably connected with the different clamping jaws, and the other end of each pull rod is rotatably connected with the different first mounting holes; the air cylinder is provided with a piston rod, and one end of the piston rod is connected with one of the three clamping jaws. The tire dismounting device can improve the tire dismounting efficiency.

Description

Technical Field

[0001] The utility model relates to a three-jaw pneumatic chuck, in particular to a three-jaw pneumatic chuck and a tire disassembly and assembly machine. Background Art

[0002] Tires are important parts of vehicles, which are easy to wear and need to be replaced frequently. In the related art, tires are usually removed or installed manually with a jack. However, in the related art, large tires require multiple people to remove or install, which makes it difficult to quickly remove or install vehicle tires, resulting in low efficiency in tire removal or installation.

[0003] It can be seen that the related art has the problem of low efficiency in disassembly or installation of tires. Utility Model Content

[0004] The embodiment of the utility model provides a three-jaw pneumatic chuck and a tire disassembly and assembly machine to solve the problem of low efficiency in disassembly or installation of tires in the related art.

[0005] In order to achieve the above-mentioned object, the embodiment of the utility model provides a three-jaw pneumatic chuck, comprising:

[0006] A disc body, wherein the disc body is provided with three grooves, each of the three grooves penetrates two opposite surfaces of the disc body, and the axis of the disc body is provided with a first through hole;

[0007] Three claws, the three claws corresponding to the three grooves one by one, and each of the three claws is movably connected to the disc body through a different groove;

[0008] A turntable, the turntable is located on the first surface of the disk body, the turntable is rotatably connected to the disk body, the axis of the turntable is provided with a second through hole, the first through hole is communicated with the second through hole, and the turntable is provided with three first mounting holes;

[0009] Three pull rods, the three pull rods correspond to the three claws one by one, and the three pull rods correspond to the three first mounting holes one by one, one end of each of the three pull rods is rotatably connected to a different claw, and the other end of each of the three pull rods is rotatably connected to a different first mounting hole;

[0010] The cylinder is fixed to the first surface of the disc body, and the cylinder is provided with a piston rod, one end of the piston rod is connected to one of the three claws.

[0011] In one embodiment, each of the three claws comprises a claw body and a pressure plate, wherein:

[0012] The claw body is arranged on the second surface of the disc body, the second surface is opposite to the first surface, and the claw body is provided with two second mounting holes;

[0013] The pressure plate is arranged on the first surface of the disc body, and the pressure plate is provided with two third mounting holes. The claw body and the pressure plate are fixedly connected by two bolts passing through different second mounting holes, grooves and third mounting holes respectively. After fixation, the distance between the pressure plate and the claw body is greater than the thickness of the disc body.

[0014] In one embodiment, a first protrusion is provided on one side of the claw body close to the second surface of the disc body, the first protrusion is located in a groove, the shape of the first protrusion matches the shape of the groove, and the size of the first protrusion matches the size of the groove.

[0015] In one embodiment, the claw body includes a moving portion and a grabbing portion connected to one end of the moving portion close to the first through hole, the included angle between the grabbing portion and the moving portion is an acute angle, and the moving portion abuts against the disk body.

[0016] In one embodiment, one end of the moving portion close to the first through hole is a triangular structure, and one side of the grabbing portion close to the first through hole is a trapezoidal structure.

[0017] In one embodiment, an end of the grabbing portion away from the moving portion is provided with an extension portion facing the first through hole, and the extension portion is provided with a second protrusion.

[0018] In one embodiment, the three-jaw pneumatic chuck also includes a mounting frame, which is fixed to a pressure plate included in a clamping jaw among the three clamping jaws connected to the piston rod. The mounting frame is provided with a rotating shaft at one end away from the disc body, and one end of the piston rod is rotatably connected to the rotating shaft.

[0019] In one embodiment, when the piston rod is in an extended state, ends of the three claws away from the first through hole are located inside the edge of the disc body.

[0020] In one embodiment, the first through hole is provided with a groove.

[0021] The embodiment of the utility model also provides a tire disassembly and assembly machine, comprising the above-mentioned three-jaw pneumatic chuck.

[0022] One of the above technical solutions has the following advantages or beneficial effects:

[0023] In an embodiment of the utility model, a three-jaw pneumatic chuck is provided, including a disc body, the disc body is provided with three grooves, each of the three grooves is connected and passes through two opposite surfaces of the disc body, and the axis of the disc body is provided with a first through hole; three claws, the three claws correspond to the three grooves one by one, and each of the three claws is movably connected to the disc body through different grooves; a turntable, the turntable is located on the first surface of the disc body, the turntable is rotatably connected to the disc body, the axis of the turntable is provided with a second through hole, the first through hole and the second through hole are connected, and the turntable is provided with three first mounting holes; three pull rods, the three pull rods correspond to the three claws one by one, and the three pull rods correspond to the three first mounting holes one by one, one end of each of the three pull rods is rotatably connected to a different claw, and the other end of each pull rod is rotatably connected to a different first mounting hole; a cylinder, the cylinder is fixed to the first surface of the disc body, the cylinder is provided with a piston rod, and one end of the piston rod is connected to one of the three claws. In this way, through the above connection, the piston rod of the cylinder can drive the movement of a claw, and the claw drives the movement of other claws through the pull rod and the turntable, so that the three claws move synchronously to grab the tire, realizing the rapid grabbing of the tire controlled by the cylinder, facilitating the removal or installation of the tire, thereby improving the efficiency of the removal or installation of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is one of the schematic diagrams of the three-jaw pneumatic chuck provided by the embodiment of the utility model;

[0026] Figure 2 This is the second schematic diagram of the three-jaw pneumatic chuck provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1 and Figure 2 As shown, the utility model embodiment provides a three-jaw pneumatic chuck, comprising:

[0029] A disk body 10, wherein the disk body 10 is provided with three grooves 101, each of the three grooves 101 passes through two opposite surfaces of the disk body 10, and a first through hole 102 is provided at the axis of the disk body 10;

[0030] Three claws 20, the three claws 20 correspond to the three slots 101 one by one, and each of the three claws 20 is movably connected to the disk body 10 through a different slot 101;

[0031] A turntable 30, the turntable 30 is located on the first surface of the disk body 10, the turntable 30 is rotatably connected to the disk body 10, the axis of the turntable 30 is provided with a second through hole 301, the first through hole 102 and the second through hole 301 are communicated, and the turntable 30 is provided with three first mounting holes 302;

[0032] Three pull rods 40, the three pull rods 40 corresponding to the three claws 20 one by one, and the three pull rods 40 corresponding to the three first mounting holes 302 one by one, one end of each of the three pull rods 40 being rotatably connected to a different claw 20, and the other end of each of the pull rods 40 being rotatably connected to a different first mounting hole 302;

[0033] The cylinder 50 is fixed to the first surface of the disc body 10 . The cylinder 50 is provided with a piston rod 501 . One end of the piston rod 501 is connected to one of the three claws 20 .

[0034] The above-mentioned disc body 10 is a planar structure, and is used to install the claw 20, the rotating disc 30 and the cylinder 50. In some embodiments, the disc body 10 can be a triangular structure or a circular structure. The disc body 10 is prepared by:

[0035] 1) Select hot-rolled steel plates, use flame cutting to cut the outer shape of the disc body 10, and reserve a processing allowance during cutting;

[0036] 2) Leveling the plate 10 using hydraulic equipment;

[0037] 3) Using a high-precision CNC laser cutting machine to cut out the shape of the disc body 10 and the three grooves 101 located on the disc body 10 to ensure dimensional tolerance;

[0038] 4) polishing the surface of the disc body 10 with a belt sander;

[0039] 5) The surface of the tray body 10 is subjected to plastic spraying treatment to prevent the surface of the tray body 10 from rusting.

[0040] In the related art, the disc body 10 of the three-jaw pneumatic chuck is flame-cut by a flame cutting machine from a steel plate, the cut disc body 10 blank is leveled by a hydraulic device, the outer circle and plane are turned by a lathe, the outer shape and long grooves are milled by a milling machine, and the surface is sandblasted and electroplated. By processing the disc body 10 in the above manner, it is no longer necessary to perform mechanical processing on the disc body 10, which can reduce the processing cost. At the same time, the surface of the disc body 10 is not rust-proofed by electroplating or other methods, but the surface is sprayed with plastic, which can further reduce the processing cost.

[0041] The disc body 10 is provided with a first through hole 102 , through which the disc body 10 can be connected and fixed to the main shaft of the tire disassembly and assembly machine.

[0042] The three claws 20 are used to grasp three positions of the tire to achieve stable grasping of the tire and quick removal or installation of the tire. Each claw 20 is movably connected to the three-claw pneumatic chuck through the slot 101, and the claw 20 moves in the slot 101 to achieve approaching or moving away from the tire.

[0043] The three claws 20 are evenly distributed on the surface of the disc body 10 to improve the stability of gripping the tire.

[0044] The turntable 30 is rotatably connected to the disk body 10, and the three pull rods 40 are all connected to the turntable 30, and the three pull rods 40 are respectively connected to different claws 20. In this way, through the rotation of the turntable 30 and the three pull rods 40, the three claws 20 can be approached to the tire at the same time to grab the tire, or can be moved away from the tire at the same time to release the grabbed tire.

[0045] The turntable 30 is provided with a second through hole 301 , and the first through hole 102 is communicated with the second through hole 301 , and the three-jaw pneumatic chuck is fixed to the main shaft of the tire disassembly and assembly machine through the first through hole 102 and the second through hole 301 .

[0046] In some embodiments, the turntable 30 may be triangular or circular, and the three first mounting holes 302 are evenly arranged on the surface of the turntable 30 .

[0047] One end of the piston rod 501 of the cylinder 50 is connected to a claw 20 , and the cylinder 50 controls the movement of the piston rod 501 to realize automatic control of the three claws 20 .

[0048] Specifically, the cylinder 50 controls the piston rod 501 to extend, and the piston rod 501 drives a claw 20 away from the first through hole 102. The claw 20 drives the turntable 30 to rotate through the pull rod 40, and then drives the other claws 20 to move away from the first through hole 102 synchronously, thereby releasing the grasped tire; the cylinder 50 controls the piston rod 501 to shorten, and the piston rod 501 drives a claw 20 close to the first through hole 102. The claw 20 drives the turntable 30 to rotate through the pull rod 40, and then drives the other claws 20 to move close to the first through hole 102 synchronously, thereby grasping the tire.

[0049] The number of cylinders 50 can be set according to demand, and one cylinder 50 or multiple cylinders 50 can be set.

[0050] In an embodiment of the utility model, a three-jaw pneumatic chuck is provided, including a disc body 10, the disc body 10 is provided with three grooves 101, each of the three grooves 101 communicates and penetrates two opposite surfaces of the disc body 10, and the axis of the disc body 10 is provided with a first through hole 102; three clamping jaws 20, the three clamping jaws 20 correspond to the three grooves 101 one by one, and each of the three clamping jaws 20 is movably connected to the disc body 10 through different grooves 101; a rotating disk 30, the rotating disk 30 is located on the first surface of the disc body 10, the rotating disk 30 is rotatably connected to the disc body 10, and the axis of the rotating disk 30 is provided with a second through hole 301, The first through hole 102 is connected to the second through hole 301, and the turntable 30 is provided with three first mounting holes 302; three pull rods 40, the three pull rods 40 correspond to the three claws 20 one by one, and the three pull rods 40 correspond to the three first mounting holes 302 one by one, one end of each of the three pull rods 40 is rotatably connected to a different claw 20, and the other end of each pull rod 40 is rotatably connected to a different first mounting hole 302; a cylinder 50, the cylinder 50 is fixed to the first surface of the disk body 10, and the cylinder 50 is provided with a piston rod 501, and one end of the piston rod 501 is connected to one of the three claws 20. In this way, through the above-mentioned connection, the piston rod 501 of the cylinder 50 can drive the movement of a claw 20, and the claw 20 drives the movement of other claws 20 through the pull rod 40 and the turntable 30, so that the three claws 20 move synchronously to grab the tire, thereby realizing the rapid grabbing of the tire controlled by the cylinder 50, facilitating the removal or installation of the tire, thereby improving the efficiency of the removal or installation of the tire.

[0051] In one embodiment, each of the three claws 20 comprises a claw body 201 and a pressure plate 202, wherein:

[0052] The claw body 201 is disposed on the second surface of the disc body 10, the second surface is opposite to the first surface, and the claw body 201 is provided with two second mounting holes;

[0053] The pressure plate 202 is arranged on the first surface of the disc body 10, and the pressure plate 202 is provided with two third mounting holes 203. The claw body 201 and the pressure plate 202 are fixedly connected by two bolts passing through different second mounting holes, grooves 101 and third mounting holes 203 respectively. After fixation, the distance between the pressure plate 202 and the claw body 201 is greater than the thickness of the disc body 10.

[0054] The claw body 201 is located on the second surface and is used to directly grab the tire; the pressure plate 202 is located on the first surface and is used to movably connect the claw body 201 to the three-jaw pneumatic chuck. It should be noted that the disc body 10 has not been machined and has an uneven surface. If the claw body 201 is directly connected to the disc body 10, there will be a gap at the connection position, which may easily cause the claw body 201 to shake during movement. In the embodiment of the utility model, a pressure plate 202 is provided on the first surface. The connection between the pressure plate 202 and the claw body 201 can reduce the gap at the connection position, thereby reducing the shaking of the claw body 201 during movement and improving the stability of grabbing the tire.

[0055] Among them, the pressure plate 202 is connected to the claw body 201 by two bolts, and the bolts pass through the second mounting hole, the third mounting hole 203 and the groove 101. While the pressure plate 202 is connected to the claw body 201 by the two bolts, it plays a guiding role in the process of the claw approaching or moving away from the first through hole 102, further improving the stability of grabbing the tire.

[0056] The distance between the fixed rear pressure plate 202 and the claw body 201 is greater than the thickness of the disc body 10 , so that the claw body 201 can move relative to the disc body 10 .

[0057] In the embodiment of the utility model, each of the three claws 20 includes a claw body 201 and a pressure plate 202, wherein the claw body 201 is arranged on the second surface of the disc body 10, the second surface is opposite to the first surface, and the claw body 201 is provided with two second mounting holes; the pressure plate 202 is arranged on the first surface of the disc body 10, and the pressure plate 202 is provided with two third mounting holes 203, and the claw body 201 and the pressure plate 202 are fixedly connected by two bolts passing through different second mounting holes, the groove 101 and the third mounting holes 203 respectively, and the distance between the pressure plate 202 and the claw body 201 after fixing is greater than the thickness of the disc body 10. In this way, by connecting the pressure plate 202 and the claw body 201, the gap at the connection position can be reduced, thereby reducing the shaking of the claw body 201 during the movement, and improving the stability of grabbing the tire.

[0058] Furthermore, the pull rod 40 is rotatably connected to a third mounting hole 203 on the pressure plate 202 , so that the synchronous movement of the claw bodies 201 included in the three claws 20 can be achieved through the pull rod 40 and the rotating disk 30 .

[0059] In one embodiment, a first protrusion is provided on one side of the claw body 201 close to the second surface of the disc body 10 , and the first protrusion is located in a groove 101 , and the shape of the first protrusion is adapted to the shape of the groove 101 , and the size of the first protrusion is adapted to the size of the groove 101 .

[0060] In the embodiment of the utility model, the shape of the first protrusion is adapted to the shape of the groove 101, and the size of the first protrusion is adapted to the size of the groove 101. By setting the first protrusion, the first protrusion plays a guiding role in the groove 101, so that the claw body 201 can move along the direction of the groove 101.

[0061] In some embodiments, the first protrusion may be a long strip structure, and the movement of the claw body 201 is guided by the long strip structure.

[0062] In some embodiments, the first protrusion may be a plurality of dot-shaped protrusions, and the movement of the claw body 201 is guided by the plurality of dot-shaped protrusions.

[0063] In one embodiment, the claw body 201 includes a moving portion 2012 and a grabbing portion 2011 connected to one end of the moving portion 2012 close to the first through hole 102 , the grabbing portion 2011 and the moving portion 2012 have an acute angle, and the moving portion 2012 abuts against the disk body 10 .

[0064] It should be noted that the claw body 201 is used to grab tires, but different types of tires have different diameters and thicknesses. The movement of the claw body 201 can only adapt to different diameters of tires, and adaptive adjustments are also required for tires of different thicknesses to achieve effective grabbing.

[0065] In an embodiment of the utility model, the claw body 201 includes a moving part 2012, and a grasping part 2011 connected to one end of the moving part 2012 close to the first through hole 102, the angle between the grasping part 2011 and the moving part 2012 is an acute angle, and the moving part 2012 abuts against the disc body 10, so that in the process of grasping the tire, the acute angle between the grasping part 2011 and the moving part 2012 can play a guiding role, lift the tire and then grasp it, so that tires of different thicknesses can be effectively grasped, and the stability of grasping the tire is improved.

[0066] The gripping portion 2011 is used to directly grip the tire, and the moving portion 2012 is used to move along the direction of the groove 101 to achieve the movement of the claw body 201. Two second mounting holes are provided on the moving portion 2012, and the moving portion 2012 and the pressure plate 202 are bolted together through the second mounting holes and the third mounting holes 203.

[0067] In one embodiment, one end of the moving portion 2012 close to the first through hole 102 is a triangular structure, and one side of the grabbing portion 2011 close to the first through hole 102 is a trapezoidal structure.

[0068] It should be noted that the angle between the gripping part 2011 and the moving part 2012 is an acute angle, and in the process of gripping the tire, the angle between the gripping part 2011 and the moving part 2012 is an acute angle, which can play a guiding role. In the embodiment of the utility model, by setting the end of the moving part 2012 close to the first through hole 102 as a triangular structure, and setting the side of the gripping part 2011 close to the first through hole 102 as a trapezoidal structure, in this way, in the process of gripping the tire, the triangular structure of the moving part 2012 contacts the tire, and the guidance is achieved through the triangular structure; the trapezoidal structure of the gripping part 2011 contacts the tire, and the guidance is achieved through the trapezoidal structure, that is, the guidance is achieved through the joint action of the triangular structure and the trapezoidal structure, so that tires of different thicknesses can be effectively gripped, and the stability of gripping the tire is improved.

[0069] Furthermore, in the process of grabbing the tire, the triangular structure and the trapezoidal structure are in direct contact with the tire. The triangular structure and the trapezoidal structure have higher structural strength than the plane structure, which can effectively reduce wear and tear and damage caused by wear, thereby extending the service life of the claw body 201.

[0070] In one embodiment, an end of the grabbing portion 2011 away from the moving portion 2012 is provided with an extension portion toward the first through hole 102 , and the extension portion is provided with a second protrusion.

[0071] In the embodiment of the utility model, the extension part is used to abut against the tread of the tire to prevent the rotation and shaking of the tire and improve the stability of grasping the tire. Furthermore, the extension part is provided with a second protrusion, which can increase the pressure between the extension part and the tire when the extension part grasps the tire, thereby increasing the friction force and further improving the stability of grasping the tire.

[0072] In one embodiment, the three-jaw pneumatic chuck also includes a mounting frame 60, which is fixed to a pressure plate 202 included in a jaw 20 among the three jaws 20 connected to the piston rod 501. The mounting frame 60 is provided with a rotating shaft 61 at one end away from the disc body 10, and one end of the piston rod 501 is rotatably connected to the rotating shaft 61.

[0073] It should be noted that, in the process of grabbing the tire by the claw 20, the cylinder 50 is required to control the extension and retraction of the piston rod 501 to realize the control of the movement of the claw 20. In the process of extending and retracting the piston rod 501, the piston rod 501 and the pressure plate 202 of the claw 20 are offset, and the offset stress has the risk of damaging the pressure plate 202 or the piston rod 501. In the embodiment of the utility model, a mounting frame 60 is provided, and the mounting frame 60 is fixed to the pressure plate 202 included in the claw 20 connected to the piston rod 501 among the three claws 20, and the mounting frame 60 is provided with a rotating shaft 61 at one end away from the disc body 10, and one end of the piston rod 501 is rotatably connected to the rotating shaft 61. In this way, through the rotating shaft 61 and the rotatable connection of one end of the piston rod 501 with the rotating shaft 61, the stress generated by the offset of the piston rod 501 and the pressure plate 202 of the claw 20 during the extension and retraction of the piston rod 501 can be eliminated, thereby reducing the possibility of damaging the pressure plate 202 or the piston rod 501.

[0074] In one embodiment, when the piston rod 501 is in the extended state, one end of the three claws 20 away from the first through hole 102 is located inside the edge of the disk body 10 .

[0075] It should be noted that the claws 20 are movably connected to the groove 101. If the piston rod 501 is in the extended state, the piston rod 501 is too long, which may cause the claws 20 to be pushed out of the groove 101, resulting in the three-jaw pneumatic chuck being unable to grab the tire. In the embodiment of the utility model, the depth of the groove 101 and the length of the piston rod 501 are adjusted so that when the piston rod 501 is in the extended state, the ends of the three claws 20 away from the first through hole 102 are on the inner side of the edge of the disc body 10, so as to prevent the claws 20 from being pushed out of the groove 101.

[0076] In some embodiments, a protrusion is provided at one end of the slot 101 away from the first through hole 102 , and the protrusion prevents the claw 20 from being pushed out of the slot 101 .

[0077] In some embodiments, one end of the slot 101 away from the first through hole 102 is a closed structure, and the closed structure prevents the claw 20 from being pushed out of the slot 101 .

[0078] In one embodiment, the first through hole 102 is provided with a groove.

[0079] In the embodiment of the utility model, the first through hole 102 is provided with a groove, so that the three-jaw pneumatic chuck is connected to the main shaft key of the tire disassembly machine through the groove of the first through hole 102.

[0080] In some embodiments, the second through hole 301 is provided with a groove, and the groove of the second through hole 301 is connected to the groove of the first through hole 102, so that the three-jaw pneumatic chuck is connected to the spindle key of the tire disassembler through the groove of the first through hole 102 and the groove of the second through hole 301.

[0081] The embodiment of the utility model also provides a tire disassembly and assembly machine, comprising the above-mentioned three-jaw pneumatic chuck.

[0082] It should be noted that the tire disassembly and assembly machine provided in the embodiment of the utility model can realize each process of each embodiment of the above-mentioned three-jaw pneumatic chuck, the technical features correspond one to one, and can achieve the same technical effect. To avoid repetition, they will not be described here.

[0083] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0084] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A three-jaw pneumatic chuck, characterized in that: include: A disc body, wherein the disc body is provided with three grooves, each of the three grooves penetrates two opposite surfaces of the disc body, and the axis of the disc body is provided with a first through hole; Three claws, the three claws corresponding to the three grooves one by one, and each of the three claws is movably connected to the disc body through a different groove; A turntable, the turntable is located on the first surface of the disk body, the turntable is rotatably connected to the disk body, the axis of the turntable is provided with a second through hole, the first through hole is communicated with the second through hole, and the turntable is provided with three first mounting holes; Three pull rods, the three pull rods correspond to the three claws one by one, and the three pull rods correspond to the three first mounting holes one by one, one end of each of the three pull rods is rotatably connected to a different claw, and the other end of each of the three pull rods is rotatably connected to a different first mounting hole; The cylinder is fixed to the first surface of the disc body, and the cylinder is provided with a piston rod, one end of the piston rod is connected to one of the three claws.

2. The three-jaw pneumatic chuck according to claim 1, characterized in that: Each of the three claws comprises a claw body and a pressure plate, wherein: The claw body is arranged on the second surface of the disc body, the second surface is opposite to the first surface, and the claw body is provided with two second mounting holes; The pressure plate is arranged on the first surface of the disc body, and the pressure plate is provided with two third mounting holes. The claw body and the pressure plate are fixedly connected by two bolts passing through different second mounting holes, grooves and third mounting holes respectively. After fixation, the distance between the pressure plate and the claw body is greater than the thickness of the disc body.

3. The three-jaw pneumatic chuck according to claim 2, characterized in that: A first protrusion is provided on one side of the claw body close to the second surface of the disc body. The first protrusion is located in a groove. The shape of the first protrusion matches the shape of the groove. The size of the first protrusion matches the size of the groove.

4. The three-jaw pneumatic chuck according to claim 2, characterized in that: The claw body includes a moving part and a grabbing part connected to one end of the moving part close to the first through hole. The included angle between the grabbing part and the moving part is an acute angle. The moving part abuts against the disk body.

5. The three-jaw pneumatic chuck according to claim 4, characterized in that: One end of the moving portion close to the first through hole is a triangular structure, and one side of the grabbing portion close to the first through hole is a trapezoidal structure.

6. The three-jaw pneumatic chuck according to claim 4, characterized in that: An end of the grabbing portion away from the moving portion is provided with an extending portion facing the first through hole, and the extending portion is provided with a second protrusion.

7. The three-jaw pneumatic chuck according to claim 2, characterized in that: It also includes a mounting frame, which is fixed to a pressure plate included in a clamping claw connected to the piston rod among the three clamping claws. The mounting frame is provided with a rotating shaft at one end away from the disk body, and one end of the piston rod is rotatably connected to the rotating shaft.

8. The three-jaw pneumatic chuck according to any one of claims 1 to 7, characterized in that: When the piston rod is in an extended state, one end of the three claws away from the first through hole is located inside the edge of the disk body.

9. The three-jaw pneumatic chuck according to any one of claims 1 to 7, characterized in that: The first through hole is provided with a groove.

10. A tire disassembly and assembly machine, characterized in that: It comprises a three-jaw pneumatic chuck as claimed in any one of claims 1 to 9.

Images