Three-jaw chuck for planetary gears

Abstract

The application relates to the field of gear machining, in particular to a three-jaw chuck for a planetary gear, which comprises a disc body, a gas supply device and a plurality of clamping jaws, the plurality of clamping jaws are uniformly and evenly slidably connected on the disc surface of the disc body along the disc body axis, the gas supply device comprises a mounting disc and a connecting assembly, the mounting disc is coaxially connected to the surface of the disc body away from the clamping jaws through the connecting assembly, a plurality of air inlet holes are arranged on the surface of the disc body facing the mounting disc, a gas supply hole is coaxially arranged on the surface of the mounting disc away from the disc body, a connecting hole is coaxially arranged on the surface of the mounting disc facing the air inlet hole, and the gas supply hole is communicated with the plurality of connecting holes. In the application, the mounting disc and the connecting assembly are arranged, the gas supply hole is arranged on the surface of the mounting disc away from the disc body and coaxially arranged, a plurality of air pipes do not need to be mounted on the circumferential outer wall of the disc body, the clamping force of the plurality of clamping jaws on the planetary gear is guaranteed, the machining efficiency of the planetary gear is improved, the machining period of the planetary gear is shortened, and thus the machining quality of the planetary gear is improved.

Description

Technical Field

[0001] This application relates to the field of gear machining, and in particular to a three-jaw chuck for planetary gears. Background Technology

[0002] The three-jaw chuck is the most commonly used fixture on lathes. It achieves automatic centering and clamping by controlling the synchronous centrifugal or centrifugal movement of the three jaws. When it is necessary to control the three jaws to be concentric, compressed air enters the right chamber of the chuck cylinder through the air pipe, the piston is pushed to the left, the pull rod drives the wedge sleeve to move axially, the inclined surface of the wedge sleeve pushes the slide, and the slide drives the jaws to slide radially in a centrifugal direction to clamp the workpiece. When it is necessary to control the three jaws to be centrifugal, the gas is discharged from the left chamber of the cylinder through the air pipe, the return spring pushes the piston to move in the opposite direction, the wedge sleeve retracts, and the slide drives the jaws to slide radially in a centrifugal direction to release the workpiece.

[0003] When a three-jaw chuck clamps a planetary gear concentrically, the planetary gear needs to be driven to rotate during the machining of the planetary gear tooth grooves. Since the air pipe is installed on the outer circumferential wall of the chuck, when the three-jaw chuck rotates with the planetary gear, the chuck drives the air pipe to rotate. The air pipe is prone to entanglement, kinking, wear, and air leakage, which eventually leads to the loss of clamping force of the three-jaw chuck, causing the planetary gear to fly out. This reduces the machining efficiency of the planetary gear, prolongs the machining cycle of the planetary gear, and thus reduces the machining quality of the planetary gear. Summary of the Invention

[0004] To improve the machining quality of planetary gears, this application provides a three-jaw chuck for planetary gears.

[0005] This application provides a three-jaw chuck for planetary gears, which adopts the following technical solution: A three-jaw chuck for planetary gears includes a disc body, an air supply device, and multiple jaws. The multiple jaws are slidably connected to the disc body surface at even intervals around the disc body axis. The sliding direction of the jaws is perpendicular to the disc body axis. The air supply device includes a mounting plate and a connecting assembly. The mounting plate is coaxially connected to the disc body surface away from the jaws via the connecting assembly. The disc body surface facing the mounting plate has multiple air inlets at intervals, and each air inlet corresponds to one of the jaws. The mounting plate surface away from the disc body has an air supply hole coaxially formed. The mounting plate surface facing the air inlets has corresponding connecting holes, and the air supply holes connect to the multiple connecting holes. Gas can sequentially enter the air inlets through the air supply holes and connecting holes and control the sliding of the jaws.

[0006] By adopting the above technical solution, during planetary gear machining, the planetary gear is placed on the disk surface, and multiple grippers surround the outer circumference of the planetary gear. Gas enters the air inlet through the air supply hole and the connecting hole in sequence, controlling the grippers to slide radially towards the center. The multiple grippers hold the planetary gear and concentrically limit it on the disk surface. When the planetary gear is machined, it rotates and drives the disk to rotate. The air supply hole is located on the surface of the mounting plate away from the disk body and is coaxially set. There is no need to install multiple air pipes on the outer circumferential wall of the disk body, which ensures the clamping force of the multiple grippers on the planetary gear, improves the machining efficiency of the planetary gear, shortens the machining cycle of the planetary gear, and thus improves the machining quality of the planetary gear.

[0007] Optionally, the mounting plate includes a fixing part and multiple sealing parts, the multiple sealing parts being spaced apart and connected to the surface of the fixing part, the fixing part being coaxially connected to the surface of the plate body via a connecting assembly, the sealing parts corresponding to and embedded in the air inlet holes, the outer peripheral surface of the sealing parts abutting against the inner wall of the air inlet holes to form a seal, the connecting holes corresponding to the sealing parts and located at the ends of the sealing parts facing the air inlet holes, and the air supply holes located on the surface of the fixing part away from the sealing parts.

[0008] By adopting the above technical solution, the connecting assembly coaxially connects the fixing part to the surface of the disc. Gas enters the air inlet through the air supply hole and the connecting hole in sequence and controls the sliding of the gripper. At the same time, the outer peripheral surface of the sealing part presses against the inner wall of the air inlet to form a seal, so that the gas in the connecting hole is not easy to overflow from the pressing point between the outer peripheral surface of the sealing part and the inner wall of the air inlet, thereby ensuring a stable supply of gas to the air inlet.

[0009] Optionally, the mounting plate further includes a positioning part and a sealing ring. The positioning part is connected to the surface of the fixing part facing the plate body. The plate body has a positioning cavity coaxially formed on its surface for the end of the positioning part to be embedded. The sealing ring is coaxially sleeved on the outer peripheral surface of the positioning part. The inner wall of the sealing ring abuts against the outer peripheral surface of the positioning part to form a seal, and the outer wall of the sealing ring abuts against the inner wall of the positioning cavity to form a seal.

[0010] By adopting the above technical solution, when the end of the positioning part is embedded in the positioning cavity, the inner wall of the positioning cavity abuts against the outer peripheral surface of the positioning part to form a positioning, and the axis of the fixing part coincides with the axis of the disc body; at the same time, the inner wall of the sealing ring abuts against the outer peripheral surface of the positioning part to form a seal, and the outer wall of the sealing ring abuts against the inner wall of the positioning cavity to form a seal, so that the gas in the air inlet is not easy to enter the positioning cavity from the abutment between the outer peripheral surface of the positioning part and the inner wall of the positioning cavity, further improving the stability of the air supply to the air inlet.

[0011] Optionally, the connecting assembly includes a connecting ring connected to the surface of the disc body facing the fixing part. The surface of the fixing part has a connecting cavity for the connecting ring to be inserted, and the inner wall of the connecting cavity abuts against the inner wall of the connecting ring to form a limiting position.

[0012] By adopting the above technical solution, when the positioning part is embedded in the positioning cavity, the end of the connecting ring is embedded in the connecting cavity, and the inner wall of the connecting cavity abuts against the inner wall of the connecting ring to form a limit, making it difficult for the fixing part to detach from the disc body, thereby improving the connection stability between the fixing part and the disc body.

[0013] Optionally, the connecting assembly further includes a limiting block and an elastic element. The inner wall of the connecting cavity has a limiting cavity for the limiting block to slide. The sliding direction of the limiting block is perpendicular to the axis of the fixing part. The inner ring wall of the connecting ring has a limiting groove for the end of the limiting block to be embedded. One end of the elastic element in the elastic direction is connected to the inner wall of the limiting cavity, and the other end of the elastic element in the elastic direction is connected to the surface of the limiting block. The elastic element has the tendency to drive the end of the limiting block to be embedded in the limiting groove.

[0014] By adopting the above technical solution, when the inner ring wall of the connecting ring is pressed against the inner wall of the connecting cavity, the limiting groove connects to the limiting cavity. The elastic force of the elastic element drives the limiting block to slide towards the limiting groove. The end of the limiting block is embedded in the limiting groove, and the surface of the limiting block is pressed against the inner wall of the limiting groove and limits the connecting ring, making it difficult for the connecting ring to detach from the connecting cavity, thereby improving the connection stability between the fixing part and the disc body.

[0015] Optionally, the connecting assembly further includes a force-applying rod and a connecting rod. The surface of the fixed part away from the disc body is provided with a slide for the force-applying rod to slide. The sliding direction of the force-applying rod is parallel to the axis of the fixed part. The slide connects to the limiting cavity. One end of the connecting rod is rotatably connected to the surface of the limiting block, and the other end of the connecting rod is rotatably connected to the surface of the force-applying rod. The force-applying rod drives the limiting block to slide within the inner wall of the limiting cavity through the connecting rod.

[0016] By adopting the above technical solution, before the fixing part is installed, the force-applying rod is pulled away from the fixing part, the connecting rod rotates, and the limiting block slides towards the limiting cavity. The surface of the limiting block is flush with the inner wall of the connecting cavity. When the connecting ring is embedded in the connecting cavity and the limiting cavity is connected to the limiting groove, the force-applying rod is released. The elastic force of the elastic element drives the limiting block to slide towards the limiting groove and embed. The surface of the limiting block presses against the inner wall of the limiting groove to form a limit, reducing the wear between the limiting block and the connecting ring, thereby extending the service life of the three-jaw chuck.

[0017] Optionally, multiple limiting blocks and force-applying rods are provided, and the connecting assembly further includes a limiting ring, with the ends of the multiple force-applying rods protruding from the fixing portion being connected at intervals to the ring surface of the limiting ring.

[0018] By adopting the above technical solution, multiple limiting blocks are provided, increasing the limiting points of the connecting ring and making it less likely for the connecting ring to shift within the connecting cavity, thereby improving the limiting stability of the connecting ring within the connecting cavity; at the same time, the ends of multiple force rods protruding from the fixing part are connected at intervals to the ring surface of the limiting ring, and the operator only needs to pull the limiting ring to control the sliding of multiple force rods on the inner wall of the slide, thereby improving the assembly efficiency of the three-jaw chuck.

[0019] Optionally, the connecting assembly further includes a slider connected to the surface of the force-applying rod. The inner wall of the slide rail is provided with a groove for the slider to slide. When the force-applying rod slides on the inner wall of the slide rail, it drives the slider to slide on the inner wall of the groove.

[0020] By adopting the above technical solution, when the force-applying rod slides on the inner wall of the slideway, it drives the slider to slide on the inner wall of the slide groove. The slider limits the sliding distance of the force-applying rod, so that the force-applying rod is not prone to excessive sliding on the inner wall of the slideway and damage to the connecting rod, thereby extending the service life of the three-jaw chuck.

[0021] Optionally, the air supply device further includes multiple sealing ring bladders, each corresponding to an air inlet. The inner wall of the air inlet is coaxially provided with a sealing cavity for the sealing ring bladder to be embedded in. The inner wall of the sealing ring bladder abuts against the outer circumferential surface of the sealing part to form a seal.

[0022] By adopting the above technical solution, the outer ring wall of the sealing ring bladder abuts against the inner wall of the sealing cavity to form a seal, and the inner ring wall of the sealing ring bladder abuts against the outer circumferential surface of the sealing part to form a seal, so that the gas in the air inlet is not easy to overflow from the abutment between the outer circumferential surface of the sealing part and the inner ring wall of the sealing ring bladder, thereby improving the stability of the gas supplied to the air inlet.

[0023] Optionally, the connecting assembly further includes a pressure regulating ring bladder, the outer ring wall of which is connected to the inner wall of the limiting groove, the inner ring wall of which can abut against the outer peripheral surface of the limiting block to form a limiting position, the inner wall of the limiting groove is provided with a pressure regulating flow channel, the pressure regulating flow channel connects the limiting groove and the sealing cavity, and the inner cavity of the pressure regulating ring bladder is connected to the inner cavity of the sealing ring bladder through the pressure regulating flow channel.

[0024] By adopting the above technical solution, the sealing ring bladder is connected to the inner cavity of the pressure regulating ring bladder through the pressure regulating channel. When the sealing part is embedded in the air inlet and squeezes the inner ring wall of the sealing ring bladder, the gas in the sealing ring bladder enters the inner cavity of the pressure regulating ring bladder through the pressure regulating channel, reducing the wear between the sealing part and the inner ring wall of the sealing ring bladder. When the elastic force of the elastic element drives the end of the limiting block to be embedded in the inner ring of the pressure regulating ring bladder in the limiting groove, the outer peripheral surface of the limiting block squeezes the inner ring wall of the pressure regulating ring bladder, and the gas in the pressure regulating ring bladder enters the inner cavity of the sealing ring bladder through the pressure regulating channel. The sealing ring bladder is pressurized and expands, and the inner ring wall of the sealing ring bladder presses against the outer peripheral surface of the sealing part to form a seal, thereby achieving directional sealing of the inner ring wall of the sealing ring bladder against the outer peripheral surface of the sealing part.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The mounting plate and connecting components are designed such that the air supply port is located on the surface of the mounting plate away from the plate body and is coaxially arranged. This eliminates the need to install multiple air pipes on the outer circumferential wall of the plate body, ensuring the clamping force of multiple grippers on the planetary gears, improving the processing efficiency of the planetary gears, shortening the processing cycle of the planetary gears, and thus improving the processing quality of the planetary gears. The setting of the fixing part and the sealing part makes it difficult for the gas in the connection hole to escape from the sealing part's outer peripheral surface and the air inlet's inner wall, thereby ensuring a stable supply of gas to the air inlet. The positioning part and sealing ring prevent gas from easily entering the positioning cavity from the contact point between the outer circumference of the positioning part and the inner wall of the positioning cavity, thus further improving the stability of the air supply to the air inlet. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0027] Figure 2 This is an exploded view of an embodiment of this application.

[0028] Figure 3 This is a partial cross-sectional view of an embodiment of this application, mainly showing the connecting components.

[0029] Explanation of reference numerals in the attached drawings: 1. Disc body; 11. Positioning cavity; 12. Air inlet; 13. Sealing cavity; 14. Pressure regulating channel; 2. Air supply device; 21. Mounting disc; 211. Fixing part; 2111. Air supply hole; 2112. Connecting cavity; 2113. Limiting cavity; 2114. Slide rail; 2115. Slide groove; 212. Positioning part; 2121. Mounting cavity; 213. Sealing ring; 214. Sealing part; 2141. Connecting hole; 22. Connecting assembly; 221. Connecting ring; 2211. Limiting groove; 222. Limiting ring; 223. Limiting block; 224. Elastic element; 225. Force rod; 226. Connecting rod; 228. Pressure regulating ring bladder; 229. Slider; 23. Sealing ring bladder; 3. Gripper. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a three-jaw chuck for planetary gears. (Refer to...) Figure 1The three-jaw chuck for planetary gears includes a disc body 1, an air supply device 2, and multiple jaws 3. The multiple jaws 3 are evenly and slidably connected to the disc surface of the disc body 1 around the axis of the disc body 1. The sliding direction of the jaws 3 is perpendicular to the axis of the disc body 1. When the multiple jaws 3 slide radially inward along the disc surface of the disc body 1, the multiple jaws 3 clamp the outer circumference of the planetary gear and concentrically limit the planetary gear on the disc surface of the disc body 1. The air supply device 2 is coaxially installed on the surface of the disc body 1 away from the jaws 3. Gas enters the disc body 1 through the air supply device 2 and controls the sliding of the jaws 3. It is not necessary to install multiple air pipes on the outer circumference of the disc body 1, which ensures the clamping force of the multiple jaws 3 on the planetary gear, improves the processing efficiency of the planetary gear, shortens the processing cycle of the planetary gear, and thus improves the processing quality of the planetary gear.

[0032] Reference Figure 2 and Figure 3 The gas supply device 2 includes a mounting plate 21, a connecting assembly 22, and multiple sealing ring bladders 23. The mounting plate 21 can be made of rubber or silicone. In this embodiment, the mounting plate 21 is made of rubber and has a certain deformation capability. The mounting plate 21 includes a fixing part 211, a positioning part 212, a sealing ring 213, and multiple sealing parts 214. The positioning part 212 is coaxially connected to one end of the fixing part 211 along the axial direction. The multiple sealing parts 214 are evenly distributed around the axis of the fixing part 211 and surround the outer peripheral surface of the positioning part 212. The sealing ring 213 can be made of rubber or silicone. In this embodiment, the sealing ring 213 is made of rubber and has a certain deformation capability. The outer peripheral surface of the positioning part 212 is coaxially provided with a mounting cavity 2121 for the sealing ring 213 to be embedded. The inner wall of the sealing ring 213 abuts against the inner wall of the mounting cavity 2121 to form a seal.

[0033] Reference Figure 2 and Figure 3The surface of the disc body 1 facing away from the gripper 3 has a positioning cavity 11 coaxially formed for the positioning part 212 to be inserted. The surface of the positioning part 212 abuts against the inner wall of the positioning cavity 11 to form a positioning. The axis of the fixing part 211 coincides with the axis of the disc body 1, and the outer ring wall of the sealing ring 213 abuts against the inner wall of the positioning cavity 11 to form a seal. The surface of the disc body 1 facing away from the gripper 3 has a plurality of air inlet holes 12 for the end of the sealing part 214 to be inserted. The air inlet holes 12 correspond one-to-one with the gripper 3. The surface of the fixing part 211 facing away from the sealing part 214 has an air supply hole 2111 coaxially formed. A connecting hole 2141 is provided on the end face of the air inlet 12. The air supply hole 2111 is connected to multiple connecting holes 2141. Gas can enter the air inlet 12 through the air supply hole 2111 and the connecting holes 2141 in sequence and control the sliding of the gripper 3. The air supply hole 2111 is located on the surface of the mounting plate 21 away from the plate body 1 and is coaxially arranged. It is not necessary to install multiple air pipes on the outer wall of the plate body 1, which ensures the clamping force of multiple grippers 3 on the planetary gear, improves the processing efficiency of the planetary gear, shortens the processing cycle of the planetary gear, and thus improves the processing quality of the planetary gear.

[0034] Reference Figure 2 and Figure 3 The connecting component 22 is connected between the fixing part 211 and the disk body 1. The connecting component 22 detachably and coaxially fixes the fixing part 211 to the disk surface of the disk body 1. The connecting component 22 includes a connecting ring 221, a limiting ring 222, multiple sliders 229, multiple limiting blocks 223, multiple elastic elements 224, multiple force rods 225, multiple connecting rods 226, and multiple pressure regulating rings 228. One end of the connecting ring 221 is coaxially connected to the surface of the disk body 1 facing the fixing part 211 in the axial direction, and the other end of the connecting ring 221 protrudes from the disk surface of the disk body 1. The surface of the fixing part 211 facing the disk body 1 is coaxially provided with a connecting cavity 2112 for the connecting ring 221 to be inserted. The inner wall of the connecting cavity 2112 abuts against the inner ring wall of the connecting ring 221 to form a limit, so that the fixing part 211 is not easy to shift, and the coaxial fixation between the fixing part 211 and the disk body 1 is guaranteed.

[0035] Reference Figure 2 and Figure 3The inner wall of the connecting cavity 2112 is evenly provided with multiple limiting cavities 2113 for sliding of the limiting block 223 around the axis of the fixing part 211. The sliding direction of the limiting block 223 is perpendicular to the axis of the fixing part 211. The inner wall of the connecting ring 221 is provided with multiple limiting grooves 2211 for the end of the limiting block 223 to be embedded. The elastic element 224 can be a compression spring or a tension spring. In this embodiment, the elastic element 224 is a compression spring with a certain deformation capability. One end of the elastic element 224 in the elastic direction is connected to the inner wall of the limiting cavity 2113, and the other end of the elastic element 224 in the elastic direction is connected to the surface of the limiting block 223. The elastic element 224 has the elastic force to drive the limiting block 223 to slide towards the limiting groove 2211, and the end of the limiting block 223 tends to be embedded in the limiting groove 2211.

[0036] Reference Figure 2 and Figure 3 The surface of the fixing part 211 facing away from the disc body 1 is provided with multiple slides 2114 spaced apart around the axis of the fixing part 211 for the sliding of the force application rod 225. The sliding direction of the force application rod 225 is parallel to the axis of the fixing part 211. The slides 2114 correspond one-to-one with the limiting cavity 2113 and are connected. The connecting rod 226 corresponds one-to-one with the limiting block 223. One end of the connecting rod 226 is rotatably connected to the surface of the limiting block 223, and the other end of the connecting rod 226 is rotatably connected to the rod surface of the force application rod 225. The force application rod 225 pushes the limiting block 223 to slide on the inner wall of the limiting cavity 2113 through the connecting rod 226.

[0037] Reference Figure 2 and Figure 3 The slider 229 corresponds to and is connected to the force rod 225. The inner wall of the slide 2114 is provided with a groove 2115 for the slider 229 to slide. The sliding direction of the slider 229 is parallel to the sliding direction of the force rod 225. When the force rod 225 slides on the inner wall of the slide 2114, it drives the slider 229 to slide on the inner wall of the groove 2115. The slider 229 limits the sliding distance of the force rod 225 to avoid the force rod 225 from sliding too much and damaging the connecting rod 226, thereby extending the service life of the three-jaw chuck.

[0038] Reference Figure 2 and Figure 3 The sealing ring bladder 23 can be made of rubber or silicone. In this embodiment, the sealing ring bladder 23 is made of rubber, which has a certain deformation capability. The sealing ring bladder 23 corresponds one-to-one with the air inlet 12. The inner wall of the air inlet 12 is coaxially provided with a sealing cavity 13 for the sealing ring bladder 23 to be embedded. The inner wall of the sealing ring bladder 23 abuts against the inner wall of the sealing cavity 13 to form a seal. The inner wall of the sealing ring bladder 23 abuts against the outer peripheral surface of the sealing part 214 to form a seal, so that the gas in the air inlet 12 is not easy to overflow from the abutting part of the outer peripheral surface of the sealing part 214 and the inner wall of the air inlet 12, thereby ensuring the stability of the air intake of the air inlet 12.

[0039] Reference Figure 2 and Figure 3 The pressure regulating ring bladder 228 can be made of rubber or silicone. In this embodiment, the pressure regulating ring bladder 228 is made of rubber, which has a certain deformation capability. The pressure regulating ring bladder 228 corresponds one-to-one with the limiting groove 2211. The outer ring wall of the pressure regulating ring bladder 228 is connected to the inner wall of the limiting groove 2211. The inner ring wall of the pressure regulating ring bladder 228 can press against the outer peripheral surface of the limiting block 223 to form a limit. The inner wall of the limiting groove 2211 is provided with a pressure regulating flow channel 14. The pressure regulating flow channel 14 connects the limiting groove 2211 and the sealing cavity 13. The inner cavity of the pressure regulating ring bladder 228 is connected to the inner cavity of the sealing ring bladder 23 through the pressure regulating flow channel 14.

[0040] Reference Figure 2 and Figure 3 When the sealing part 214 is embedded in the air inlet 12 and squeezes the inner wall of the sealing ring bladder 23, the gas in the sealing ring bladder 23 enters the inner cavity of the pressure regulating ring bladder 228 through the pressure regulating channel 14, reducing the wear between the sealing part 214 and the inner wall of the sealing ring bladder 23. When the elastic element 224 drives the end of the limiting block 223 to be embedded in the inner ring of the pressure regulating ring bladder 228 in the limiting groove 2211, the outer peripheral surface of the limiting block 223 squeezes the inner wall of the pressure regulating ring bladder 228, and the gas in the pressure regulating ring bladder 228 enters the inner cavity of the sealing ring bladder 23 through the pressure regulating channel 14. The sealing ring bladder 23 is pressurized and expanded, and the inner wall of the sealing ring bladder 23 presses against the outer peripheral surface of the sealing part 214 to form a seal, thereby achieving a directional seal between the inner wall of the sealing ring bladder 23 and the outer peripheral surface of the sealing part 214.

[0041] The implementation principle of a three-jaw chuck for planetary gears in this application embodiment is as follows: During planetary gear machining, the planetary gear is placed on the surface of the disc body 1, and multiple jaws 3 surround the outer circumference of the planetary gear. Gas enters the air inlet 12 through the air supply hole 2111 and the connecting hole 2141 in sequence, and controls the jaws 3 to slide radially inward. The multiple jaws 3 clamp the planetary gear and are concentrically limited on the surface of the disc body 1. When the planetary gear is machined, it rotates and drives the disc body 1 to rotate. The air supply hole 2111 is located on the surface of the mounting plate 21 away from the disc body 1 and is coaxially arranged. It is not necessary to install multiple air pipes on the outer circumference of the disc body 1, which ensures the clamping force of the multiple jaws 3 on the planetary gear, improves the machining efficiency of the planetary gear, shortens the machining cycle of the planetary gear, and thus improves the machining quality of the planetary gear.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A three-jaw chuck for planetary gears, characterized in that: The device includes a disc body (1), an air supply device (2), and multiple grippers (3). The multiple grippers (3) are evenly slidably connected to the disc surface of the disc body (1) around the axis of the disc body (1). The sliding direction of the grippers (3) is perpendicular to the axis of the disc body (1). The air supply device (2) includes a mounting plate (21) and a connecting assembly (22). The mounting plate (21) is coaxially connected to the surface of the disc body (1) away from the grippers (3) through the connecting assembly (22). The surface of the disc body (1) facing the mounting plate (21) has multiple openings at intervals. There are air inlets (12), and each air inlet (12) corresponds to a gripper (3). The mounting plate (21) has an air supply hole (2111) coaxially opened on the surface away from the plate body (1). The mounting plate (21) has a connecting hole (2141) corresponding to each air inlet (12). The air supply hole (2111) is connected to multiple connecting holes (2141). Gas can enter the air inlet (12) through the air supply hole (2111) and the connecting hole (2141) in sequence and control the gripper (3) to slide.

2. The three-jaw chuck for planetary gears according to claim 1, characterized in that: The mounting plate (21) includes a fixing part (211) and a plurality of sealing parts (214). The plurality of sealing parts (214) are spaced apart on the surface of the fixing part (211). The fixing part (211) is coaxially connected to the surface of the plate body (1) through a connecting assembly (22). The sealing parts (214) correspond one-to-one with the air inlet (12) and are embedded therein. The outer peripheral surface of the sealing part (214) abuts against the inner wall of the air inlet (12) to form a seal. The connecting hole (2141) corresponds one-to-one with the sealing part (214) and is located at the end of the sealing part (214) facing the air inlet (12). The air supply hole (2111) is located on the surface of the fixing part (211) away from the sealing part (214).

3. The three-jaw chuck for planetary gears according to claim 2, characterized in that: The mounting plate (21) further includes a positioning part (212) and a sealing ring (213). The positioning part (212) is connected to the surface of the fixing part (211) facing the plate body (1). The plate body (1) has a positioning cavity (11) coaxially opened on the plate surface for the end of the positioning part (212) to be embedded. The sealing ring (213) is coaxially sleeved on the outer peripheral surface of the positioning part (212). The inner wall of the sealing ring (213) abuts against the outer peripheral surface of the positioning part (212) to form a seal, and the outer wall of the sealing ring (213) abuts against the inner wall of the positioning cavity (11) to form a seal.

4. The three-jaw chuck for planetary gears according to claim 2, characterized in that: The connecting assembly (22) includes a connecting ring (221), which is connected to the surface of the disc body (1) facing the fixing part (211). The surface of the fixing part (211) is provided with a connecting cavity (2112) for the connecting ring (221) to be inserted. The inner wall of the connecting cavity (2112) abuts against the inner wall of the connecting ring (221) to form a limiting position.

5. The three-jaw chuck for planetary gears according to claim 4, characterized in that: The connecting assembly (22) further includes a limiting block (223) and an elastic element (224). The inner wall of the connecting cavity (2112) is provided with a limiting cavity (2113) for the limiting block (223) to slide. The sliding direction of the limiting block (223) is perpendicular to the axis of the fixing part (211). The inner ring wall of the connecting ring (221) is provided with a limiting groove (2211) for the end of the limiting block (223) to be embedded. One end of the elastic element (224) in the elastic direction is connected to the inner wall of the limiting cavity (2113), and the other end of the elastic element (224) in the elastic direction is connected to the surface of the limiting block (223). The elastic element (224) has the tendency to drive the end of the limiting block (223) to be embedded in the limiting groove (2211) with elastic force.

6. The three-jaw chuck for planetary gears according to claim 5, characterized in that: The connecting assembly (22) further includes a force-applying rod (225) and a connecting rod (226). The surface of the fixing part (211) facing away from the disc body (1) is provided with a slide rail (2114) for the force-applying rod (225) to slide. The sliding direction of the force-applying rod (225) is parallel to the axis of the fixing part (211). The slide rail (2114) is connected to the limiting cavity (2113). One end of the connecting rod (226) is rotatably connected to the surface of the limiting block (223), and the other end of the connecting rod (226) is rotatably connected to the rod surface of the force-applying rod (225). The force-applying rod (225) drives the limiting block (223) to slide on the inner wall of the limiting cavity (2113) through the connecting rod (226).

7. The three-jaw chuck for planetary gears according to claim 6, characterized in that: The limiting block (223) and the force rod (225) are provided in multiple ways. The connecting assembly (22) also includes a limiting ring (222). The ends of the multiple force rods (225) protruding from the fixing part (211) are connected at intervals to the ring surface of the limiting ring (222).

8. The three-jaw chuck for planetary gears according to claim 6, characterized in that: The connecting assembly (22) also includes a slider (229), which is connected to the surface of the force-applying rod (225). The inner wall of the slide rail (2114) is provided with a groove (2115) for the slider (229) to slide. When the force-applying rod (225) slides on the inner wall of the slide rail (2114), it drives the slider (229) to slide on the inner wall of the groove (2115).

9. The three-jaw chuck for planetary gears according to claim 5, characterized in that: The gas supply device (2) also includes a plurality of sealing ring bladders (23), each of which corresponds to an air inlet (12). The inner wall of the air inlet (12) is coaxially provided with a sealing cavity (13) for the sealing ring bladders (23) to be embedded. The inner wall of the sealing ring bladder (23) abuts against the outer circumferential surface of the sealing part (214) to form a seal.

10. The three-jaw chuck for planetary gears according to claim 9, characterized in that: The connecting assembly (22) further includes a pressure regulating ring (228), the outer ring wall of which is connected to the inner wall of the limiting groove (2211), the inner ring wall of which can abut against the outer peripheral surface of the limiting block (223) to form a limit, the inner wall of the limiting groove (2211) is provided with a pressure regulating flow channel (14), the pressure regulating flow channel (14) connects the limiting groove (2211) and the sealing cavity (13), and the inner cavity of the pressure regulating ring (228) is connected to the inner cavity of the sealing ring (23) through the pressure regulating flow channel (14).

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