A combined fixture for machining automobile gearbox gears

Abstract

The present invention discloses a combined clamp for machining automobile gearbox gears, which relates to the technical field of gear machining and comprises a clamping platform, wherein an inner clamping assembly is arranged on the clamping platform. The present invention also causes three racks to move downward by moving a lifting plate downward, and the downward movement of the three racks drives the gears and the lead screw to rotate, so that three first clamping blocks move toward the center of the clamping platform. The three first clamping blocks clamp the outer ring of the gear workpiece to achieve clamping and fixing of the outer ring of the gear workpiece, and then the inner ring of the gear workpiece can be machined. The combined clamp facilitates two-way switching of the clamping of the gear workpiece, so that the inner ring or the outer ring of the gear workpiece can be clamped and machined. Through the flexibility of the combined clamp, the steps of frequently replacing the clamps during machining can be avoided, the complexity of operation is reduced, the workload of operators is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gear processing, in particular to a combined fixture for processing automobile gearbox gears. Background Art

[0002] A combination fixture is a positioning fixture that is combined through various clamping and positioning structures to meet the needs of specific workpiece processing. In the process of automobile gearbox processing, the gearbox gears need to be processed. Therefore, a combination fixture for automobile gearbox gear processing is needed to meet the processing clamping and positioning needs of the gears.

[0003] The current combined fixtures for machining gears in automobile transmissions have been found to have at least the following technical problems:

[0004] When machining the outer ring of the automobile gearbox gear, it is necessary to use a fixture to clamp and fix its inner wall, and when machining the inner ring of the automobile gearbox gear, it is necessary to use a fixture to clamp and fix its outer end, which is not convenient for two-way switching clamping of the gear workpiece, and has poor flexibility. During the machining process, the fixture needs to be frequently replaced, which increases the complexity of the operation, increases the workload of the operator, and reduces the machining efficiency;

[0005] When clamping the gear of an automobile gearbox, it is necessary to repeatedly determine the center position of the gear workpiece, which is time-consuming and labor-intensive. In addition, when using ordinary clamps to clamp the gear workpiece, only the outer side or inner side can be clamped, and the clamping stability is poor. Position deviation is easy to occur during the production and processing, which reduces the accuracy and stability of the gear workpiece processing. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a combined fixture for machining automobile gearbox gears to solve the above-mentioned technical problems.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A combination clamp for processing automobile gearbox gears, comprising a clamping platform, an inner clamping assembly is arranged on the clamping platform, the inner clamping assembly comprises three first clamping blocks equidistantly distributed on the clamping platform, a cross slider is fixedly installed on the bottom end of each of the first clamping blocks, a screw rod is threaded through each of the cross sliders, a gear is fixedly installed on one end of each of the screw rods, an outer clamping assembly is arranged on the clamping platform, the outer clamping assembly comprises a telescopic platform, a second clamping block and a circular block 2, the number of the second clamping blocks is consistent with the number of the first clamping blocks, a sliding rod is fixedly installed on the end of each of the second clamping blocks, a contact block is fixedly installed on the bottom end of each of the sliding rods, three push blocks are fixedly installed on the upper end of the circular block 2 at equidistant intervals, each of the push blocks is respectively fitted with the surface of the contact block, and the fitted surfaces are all inclined, a pushing assembly is arranged below the clamping platform, the pushing assembly comprises a bottom plate and a lifting plate, and a cylinder is installed on the bottom plate.

[0011] Preferably: a circular hole is provided in the middle of the surface of the clamping platform, three sliding grooves are provided at equal intervals on the surface circumference of the clamping platform, each of the screw rods is rotatably installed in the sliding groove, each of the cross slide blocks is slidably installed in the sliding groove, the telescopic platform movably passes through the circular hole, three receiving grooves are provided at equal intervals on the side surface of the telescopic platform, each of the second clamping blocks is slidably installed in the receiving groove, limiting grooves are provided on both side inner walls of each of the receiving grooves, limiting blocks are fixedly installed on both sides of the end of each second clamping block, each of the limiting blocks is slidably installed in the limiting groove, a group of second springs are fixedly installed on each of the second clamping blocks, and each of the second clamping blocks is fixedly connected to the side walls of the receiving groove through a group of second springs.

[0012] Preferably: the round block 2 is located below the three contact blocks, both ends of the round block 2 are fixedly installed with connecting blocks, each of the connecting blocks is movably penetrated by a through rod, each of the through rods is fixedly installed in the telescopic platform, the bottom end of the round block 2 is fixedly installed with a second round rod, the bottom end of the second round rod is fixedly installed with a round block 3, a third spring is movably sleeved on the second round rod, four stop blocks are fixedly installed at equidistant intervals on the outer end of the telescopic platform, a circular plate is fixedly installed on the bottom end of the telescopic platform, the second round rod movably penetrates the middle part of the circular plate, the round block 3 is fixedly connected to the bottom end of the circular plate through the third spring, first round rods are fixedly installed on both sides of the bottom end of the circular plate, each of the first round rods is movably sleeved with a first spring, a round block 1 is fixedly installed on the bottom end of each of the first round rods, and the two first round rods are respectively located on both sides of the second round rod.

[0013] Preferably: the clamping platform is located above the base plate, the lifting plate is located between the clamping platform and the base plate, three racks are fixedly installed on the upper end of the lifting plate at equidistant intervals, each of the gears is respectively meshed with the racks, a connecting plate is fixedly installed on the upper end of the cylinder telescopic rod, the connecting plate is fixedly connected to the bottom end of the lifting plate, a through opening is opened in the middle of the surface of the lifting plate, a cylinder is fixedly installed in the middle of the bottom end of the lifting plate, the bottom end of the circular plate passes through the through opening and is movably inserted into the cylinder, each of the first circular rods movably passes through the bottom of the cylinder, the circular plate is fixedly connected to the bottom surface of the inner wall of the cylinder through two first springs, and each of the circular blocks is located below the cylinder.

[0014] Preferably: there is a gap between the round block three and the bottom surface of the inner wall of the cylinder, four mounting blocks are fixedly installed at the bottom end of the base plate, each of the mounting blocks is T-shaped, two guide rods are fixedly connected between the base plate and the clamping platform, each of the guide rods movably penetrates the lifting plate, the round block two is slidably installed in the telescopic table, the round block two is located on the bottom side of the inner cavity of the telescopic table, the upper end of the second round rod is movably inserted into the telescopic table, and there is a gap between the four blocks and the bottom end of the clamping platform.

[0015] (III) Beneficial effects

[0016] 1: The upward movement of the cylinder will drive the circular plate and the telescopic table to move up, so that the telescopic table passes through the circular hole, and the gear workpiece is set on the telescopic table. At this time, the upper ends of the four stop blocks are in contact with the bottom end of the clamping platform to perform limit blocking. At this time, the bottom end of the round block three is in contact with the bottom surface of the inner wall of the cylinder, and then the cylinder is started again to move the lifting plate and the cylinder upward. The upward movement of the cylinder will push the round block three, the second round rod and the round block two upward. The upward movement of the round block two will drive the three push blocks to move upward. The upward movement of the three push blocks will apply force to the contact blocks respectively, so that the three contact blocks expand and move outward synchronously. The three second clamping blocks will respectively resist the inner wall of the gear workpiece to fix the inner wall of the gear workpiece, and the three second clamping blocks move synchronously, which can self-center the gear of the gearbox, so that the gear workpiece can be clamped quickly and accurately, so that the outer ring of the gear workpiece can be processed.

[0017] Second: the cylinder continues to move downward, driving the telescopic table and the circular plate downward, so that the telescopic table is separated from the circular hole. At this time, the inner ring of the gear workpiece is completely exposed, and the downward movement of the lifting plate will also cause the three racks to move downward. The downward movement of the three racks drives the gears and the screw to rotate, so that the three first clamping blocks move toward the center of the clamping platform. The three first clamping blocks clamp the outer ring of the gear workpiece to achieve clamping and fixing of the outer ring of the gear workpiece, and then the inner ring of the gear workpiece can be processed. The combined fixture is convenient for bidirectional switching of clamping of the gear workpiece, so that the inner ring or outer ring of the gear workpiece can be clamped and processed. The flexibility of the combined fixture can avoid the steps of frequent replacement of fixtures during the processing process, reduce the complexity of operation, reduce the workload of operators, and improve processing efficiency.

[0018] 3: By utilizing the bottom plate to drive the lifting plate to move, and utilizing the up and down movement of the lifting plate to automatically switch the inner clamping assembly and the outer clamping assembly to clamp and fix the gear workpiece, it is more convenient to clamp and fix the gear workpiece. The inner clamping assembly is composed of three second clamping blocks distributed equidistantly around the circumference, and the three second clamping blocks clamp and fix the inner wall of the gear workpiece at the same time. The outer clamping assembly is composed of three first clamping blocks distributed equidistantly around the circumference, and the three first clamping blocks clamp and fix the outer end of the gear workpiece at the same time. Through multi-point clamping, the deviation of the workpiece during the machining process can be effectively reduced, ensuring that the workpiece is clamped and fixed evenly and firmly, thereby improving the machining accuracy and stability of the gear workpiece.

[0019] Four: Two guide rods are symmetrically fixedly installed on the upper end of the bottom plate. Both guide rods are movable and penetrate the lifting plate, which guides the movement of the lifting plate and prevents the lifting plate from lateral position deviation, ensuring the stable engagement of each rack with each gear, thereby ensuring the switching and fixation of the inner clamping assembly and the outer clamping assembly, and the structural design is reasonable.

[0020] Five: The second clamping block is slidably installed in the accommodating groove through the sliding rod, and the limiting blocks are fixedly installed on both sides of the end of the second clamping block. Each limiting block is slidably installed in the limiting groove, which limits the movement of the second clamping block and prevents the second clamping block from being separated from the telescopic table. Connecting blocks are fixedly installed at both ends of the circular block 2, and a through rod is movably penetrated in each connecting block, which limits the movement of the circular block 2, so that the circular block 2 can only move in the vertical direction, ensuring that the push block stably applies force to the contact block during the movement, and ensuring the stable use of the inner clamping assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0022] Figure 1 This is a structural diagram of the overall structure of the combined fixture for machining automobile gearbox gears of the present invention;

[0023] Figure 2 is a structural diagram of the base plate of the present invention;

[0024] Figure 3 It is a structural diagram of the lifting plate of the present invention;

[0025] Figure 4 It is a structural diagram of the telescopic platform of the present invention;

[0026] Figure 5 It is a cutaway structural diagram of the telescopic platform of the present invention;

[0027] Figure 6 This is a structural diagram of the round block 2 of the present invention;

[0028] Figure 7 is a structural diagram of the second clamping block of the present invention;

[0029] Figure 8 It is a structural diagram of the first clamping block of the present invention;

[0030] Fig. 9 It is a structural diagram of the clamping platform of the present invention.

[0031] Legend: 1. Clamping platform; 11. Slide groove; 12. Round hole; 2. First clamping block; 21. Cross slider; 22. Screw rod; 23. Gear; 3. Telescopic table; 31. Receiving groove; 32. Round plate; 33. Stop block; 34. First round rod; 35. First spring; 36. Round block one; 4. Second clamping block; 41. Slide rod; 42. Second spring; 43. Limit block; 44. Contact block; 5. Round block two; 51. Push block; 52. Second round rod; 53. Round block three; 54. Third spring; 55. Connecting block; 56. Through rod; 6. Bottom plate; 61. Cylinder; 62. Connecting plate; 63. Guide rod; 64. Mounting block; 7. Lifting plate; 71. Through port; 72. Cylinder; 73. Rack. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] Embodiment: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, in view of the problems existing in the prior art, the present invention provides a combined clamp for machining automobile gearbox gears, comprising a clamping platform 1, an inner clamping assembly is arranged on the clamping platform 1, the inner clamping assembly comprises three first clamping blocks 2 equidistantly distributed on the clamping platform 1, a cross slide 21 is fixedly installed at the bottom end of each first clamping block 2, a screw rod 22 is threadedly connected through each cross slide 21, a gear 23 is fixedly installed at one end of each screw rod 22, an outer clamping assembly is arranged on the clamping platform 1, the outer clamping assembly comprises a telescopic platform 3, a second clamping block 4 and a round block 5, the number of the second clamping blocks 4 is consistent with the number of the first clamping blocks 2, a sliding rod 41 is fixedly installed at the end of each second clamping block 4, and the bottom end of each sliding rod 41 A contact block 44 is fixedly installed, and three push blocks 51 are fixedly installed at the upper end of the circular block 5 at equal distances. Each push block 51 is respectively fitted with the surface of the contact block 44, and the fitted surfaces are all inclined. A pushing component is arranged under the clamping platform 1, and the pushing component includes a bottom plate 6 and a lifting plate 7. A cylinder 61 is installed on the bottom plate 6. A circular hole 12 is opened in the middle of the surface of the clamping platform 1, and three slide grooves 11 are opened at equal distances on the surface of the clamping platform 1. Each screw rod 22 is rotatably installed in the slide groove 11, and each cross slider 21 is slidably installed in the slide groove 11. The telescopic platform 3 movably passes through the circular hole 12, and three accommodating grooves 31 are opened at equal distances on the side surface of the telescopic platform 3. Each second clamping block 4 is slidably installed in the accommodating groove 31, and each accommodating groove 31 is slidably installed in the accommodating groove 31. Limiting grooves are provided on the inner walls of both sides of the receiving groove 31, and limiting blocks 43 are fixedly installed on both sides of the end of each second clamping block 4, and each limiting block 43 is slidably installed in the limiting grooves. A group of second springs 42 are fixedly installed on each second clamping block 4, and each second clamping block 4 is fixedly connected to the side wall of the accommodating groove 31 through a group of second springs 42. The round block 2 5 is located below the three contact blocks 44, and connecting blocks 55 are fixedly installed at both ends of the round block 2 5. A penetrating rod 56 is movably penetrated in each connecting block 55, and each penetrating rod 56 is fixedly installed in the telescopic platform 3. The bottom end of the round block 2 5 is fixedly installed with a second round rod 52, and the bottom end of the second round rod 52 is fixedly installed with a round block 3 53, and the second round rod 52 is movably sleeved with a third spring Spring 54, four stoppers 33 are fixedly installed at the outer end of the telescopic platform 3 at equal intervals, a circular plate 32 is fixedly installed at the bottom end of the telescopic platform 3, a second round rod 52 movably penetrates the middle part of the circular plate 32, a round block three 53 is fixedly connected to the bottom end of the circular plate 32 through a third spring 54, first round rods 34 are fixedly installed on both sides of the bottom end of the circular plate 32, each first round rod 34 is movably sleeved with a first spring 35, a round block one 36 is fixedly installed at the bottom end of each first round rod 34, the two first round rods 34 are respectively located on both sides of the second round rod 52, the clamping platform 1 is located above the bottom plate 6, the lifting plate 7 is located between the clamping platform 1 and the bottom plate 6, three racks 73 are fixedly installed on the upper end of the lifting plate 7 at equal intervals, and each gear 23 is respectively engaged with the rack 73,A connecting plate 62 is fixedly installed on the upper end of the telescopic rod of the cylinder 61, and the connecting plate 62 is fixedly connected to the bottom end of the lifting plate 7. A through hole 71 is opened in the middle of the surface of the lifting plate 7, and a cylinder 72 is fixedly installed in the middle of the bottom end of the lifting plate 7. The bottom end of the circular plate 32 passes through the through hole 71 and is movably inserted into the cylinder 72. Each first circular rod 34 movably penetrates the bottom of the cylinder 72, and the circular plate 32 is fixedly connected to the inner wall bottom surface of the cylinder 72 through two first springs 35. Each round block 36 is located below the cylinder 72, and there is a gap between the round block 353 and the inner wall bottom surface of the cylinder 72. Four mounting blocks 64 are fixedly installed at the bottom end of the bottom plate 6, and each mounting block 64 is T-shaped. Two guide rods 63 are fixedly connected between the bottom plate 6 and the clamping platform 1, and each guide rod 63 is movably The second round rod 52 is movably inserted into the telescopic platform 3, and there is a gap between the four stoppers 33 and the bottom end of the clamping platform 1. First, the assembly fixture is installed in the universal "T"-shaped groove on the machine tool bed through the mounting block 64 at the bottom end of the bottom plate 6, and it is limited and fixed. When it is necessary to process the outer ring of the gear, first, the cylinder 61 is started to make the connecting plate 62 push the lifting plate 7 upward, and the lifting plate 7 is moved upward to drive the rack 73 to move upward. The upward movement of the three racks 73 will drive the gears 23 to rotate respectively, so that the three screw rods 22 are rotated, and the three first clamping blocks 2 are driven away by the rotation of the three screw rods 22. As the gap between the three first clamping blocks 2 becomes larger, the cylinder 72 is driven upward by the lifting plate 7 to move upward. Since the first spring 35 is fixedly installed between the circular plate 32 and the bottom surface of the inner wall of the cylinder 72, the first spring 35 provides support. Therefore, the upward movement of the cylinder 72 will drive the circular plate 32 and the telescopic table 3 to move upward, so that the telescopic table 3 passes through the circular hole 12 and the gear workpiece is sleeved on the telescopic table 3. At this time, the upper ends of the four stoppers 33 are in contact with the bottom end of the clamping platform 1 to perform limit blocking. At this time, the bottom end of the round block three 53 is in contact with the bottom surface of the inner wall of the cylinder 72, and then the cylinder 61 is started again to move the lifting plate 7 and the cylinder 72 upward. The upward movement of the cylinder 72 will push the round block three 53, the second round rod 52 and the round block two 5 upward. The upward movement of the round block two 5 will drive the three pushers 33, the second round rod 52 and the round block two 5 upward. The block 51 moves upward, and the upward movement of the three push blocks 51 will respectively apply a force to the contact blocks 44, so that the three contact blocks 44 expand and move outward synchronously, and the three second clamping blocks 4 will respectively press against the inner wall of the gear workpiece to fix the inner wall of the gear workpiece, and the three second clamping blocks 4 move synchronously, which can self-center the gear of the gearbox, so that the gear workpiece can be clamped quickly and accurately, so that the outer ring of the gear workpiece can be processed. When the inner ring of the gear workpiece needs to be processed, the cylinder 61 is started to make the telescopic rod drive the connecting plate 62 to move downward, and the lifting plate 7 and the cylinder 72 are driven downward by the connection plate 62. The lifting plate 7 and the cylinder 72 first move downward for a distance, and the bottom surface of the inner wall of the cylinder 72 is no longer in contact with the bottom end of the round block three 53.By utilizing the elastic restoring effect of the third spring 54, the round block 2 5 and the three push blocks 51 are moved down and reset. At this time, the three push blocks 51 no longer apply force to the three contact blocks 44. By utilizing the elastic restoring effect of the second spring 42, the three second clamping blocks 4 are moved toward the center of the telescopic table 3, so that the three second clamping blocks 4 are respectively retracted into the accommodating grooves 31. The three second clamping blocks 4 release the clamping of the inner wall of the gear workpiece. Then the lifting plate 7 and the cylinder 72 continue to move downward, and the telescopic table 3 and the circular plate 32 are driven downward by the cylinder 72 to move downward, so that the telescopic table 3 is separated from the circular hole 12. At this time, the inner ring of the gear workpiece is completely exposed, and the downward movement of the lifting plate 7 will also cause the three racks 73 to move downward. The downward movement of the three racks 73 drives the gear 23 and the threaded rod 23 to move downward. The rod 22 rotates, so that the three first clamping blocks 2 move toward the center of the clamping platform 1, and the three first clamping blocks 2 clamp the outer ring of the gear workpiece to achieve clamping and fixing of the outer ring of the gear workpiece, so that the inner ring of the gear workpiece can be processed. The combined clamp is convenient for two-way switching of clamping of the gear workpiece, so that the inner ring or outer ring of the gear workpiece can be clamped and processed. The flexibility of the combined clamp can avoid the steps of frequent replacement of clamps during processing, reduce the complexity of operation, reduce the work intensity of operators, and improve processing efficiency. The lifting plate 7 is driven to move by the bottom plate 6, and the lifting plate 7 is moved up and down to automatically switch the inner clamping component and the outer clamping component to clamp and fix the gear workpiece, so that the gear workpiece can be clamped. Fixing is more convenient. The inner clamping assembly is composed of three second clamping blocks 4 distributed equidistantly around the circumference. The three second clamping blocks 4 clamp and fix the inner wall of the gear workpiece at the same time. The outer clamping assembly is composed of three first clamping blocks 2 distributed equidistantly around the circumference. The three first clamping blocks 2 clamp and fix the outer end of the gear workpiece at the same time. Through multi-point clamping, the deviation of the workpiece during processing can be effectively reduced, ensuring that the workpiece is evenly and firmly clamped and fixed, thereby improving the accuracy and stability of gear workpiece processing. Two guide rods 63 are symmetrically fixed on the upper end of the bottom plate 6. The two guide rods 63 are both movable and penetrate the lifting plate 7, which guide the movement of the lifting plate 7 and prevent the lifting plate 7 from lateral position deviation, ensuring that each rack 73 is respectively stably meshed with each gear 23, thereby ensuring the switching and fixing of the inner clamping assembly and the outer clamping assembly. The structural design is reasonable. The slide rod 41 is slidably installed in the accommodating groove 31. The limiting blocks 43 are fixedly installed on both sides of the end of the second clamping block 4. Each limiting block 43 is respectively slidably installed in the limiting groove, which plays a limiting role in the movement of the second clamping block 4 and prevents the second clamping block 4 from being separated from the telescopic table 3. The connecting blocks 55 are fixedly installed at both ends of the round block 2 5. A penetrating rod 56 is movably penetrated in each connecting block 55, which plays a limiting role in the movement of the round block 2 5, so that the round block 2 5 can only move in the vertical direction, ensuring that the push block 51 stably applies a force to the contact block 44 during the movement.Ensures stable use of the inner clamping assembly.

[0034] Working principle:

[0035] In the first step, the combined fixture is installed in the universal "T"-shaped groove on the machine tool bed through the mounting block 64 at the bottom end of the base plate 6, and it is limited and fixed. When the outer ring of the gear needs to be processed, the cylinder 61 is first started (there are two cylinders 61, distributed on both sides of the upper end of the base plate 6), so that the connecting plate 62 pushes the lifting plate 7 to move upward, and the lifting plate 7 moves upward to drive the rack 73 to move upward. The three racks 73 move upward, which respectively drive the gear 23 to rotate, so that the three screw rods 22 rotate, and the three first clamping blocks 2 are respectively driven to move away by the rotation of the three screw rods 22, so that the gap between the three first clamping blocks 2 becomes larger, and the cylinder 72 is driven upward by the lifting plate 7. Since the first spring 35 is fixedly installed between the circular plate 32 and the bottom surface of the inner wall of the cylinder 72, the first spring 35 provides support, so the circular plate 32 and the telescopic table 3 are driven upward by the cylinder 72. The telescopic table 3 passes through the circular hole 12, and the gear workpiece is sleeved on the telescopic table 3. At this time, the upper ends of the four stoppers 33 are in contact with the bottom end of the clamping platform 1 to perform position limiting blocking. At this time, the bottom end of the round block 3 53 is in contact with the bottom surface of the inner wall of the cylinder 72, and then the cylinder 61 is started to move the lifting plate 7 and the cylinder 72 upward. The upward movement of the cylinder 72 will push the round block 3 53, the second round rod 52 and the round block 2 5 upward. The upward movement of the round block 2 5 will drive the three push blocks 51 to move upward. The upward movement of the three push blocks 51 will respectively apply forces to the contact blocks 44, so that the three contact blocks 44 expand and move outward synchronously. The three second clamping blocks 4 will respectively resist the inner wall of the gear workpiece to fix the inner wall of the gear workpiece, and the three second clamping blocks 4 move synchronously, which can self-center the gear of the gearbox, so that the gear workpiece can be clamped quickly and accurately, so that the outer ring of the gear workpiece can be processed;

[0036] In the second step, when it is necessary to process the inner ring of the gear workpiece, the cylinder 61 is started to make the telescopic rod drive the connecting plate 62 to move downward, and the connecting plate 62 moves downward to drive the lifting plate 7 and the cylinder 72 to move downward. The lifting plate 7 and the cylinder 72 first move downward for a distance, and the bottom surface of the inner wall of the cylinder 72 no longer contacts the bottom end of the round block 3 53. The elastic reset effect of the third spring 54 is used to make the round block 2 5 and the three push blocks 51 move downward and reset. At this time, the three push blocks 51 no longer apply force to the three contact blocks 44. The elastic reset effect of the second spring 42 is used to make the three second clamping blocks 4 move toward the center of the telescopic table 3, so that the three second clamping blocks 4 are respectively retracted into the accommodating grooves 31, and the three second clamping blocks 4 release the clamping of the inner wall of the gear workpiece, and then the lifting plate 7 and the cylinder 72 continue to move downward, and the cylinder 72 continues to The downward movement drives the telescopic platform 3 and the circular plate 32 to move downward, so that the telescopic platform 3 is separated from the circular hole 12. At this time, the inner ring of the gear workpiece is completely exposed. The downward movement of the lifting plate 7 will also cause the three racks 73 to move downward. The downward movement of the three racks 73 drives the gear 23 and the screw rod 22 to rotate, so that the three first clamping blocks 2 move close to the center of the clamping platform 1. The three first clamping blocks 2 clamp the outer ring of the gear workpiece to achieve clamping and fixing of the outer ring of the gear workpiece, so that the inner ring of the gear workpiece can be processed. The combined clamp is convenient for bidirectional switching clamping of the gear workpiece, so that the inner ring or outer ring of the gear workpiece can be clamped and processed. Through the flexibility of the combined clamp, the steps of frequently changing the clamps during the processing can be avoided, the complexity of the operation is reduced, the work intensity of the operator is reduced, and the processing efficiency is improved;

[0037] The third step is to drive the lifting plate 7 to move by using the bottom plate 6, and automatically switch the inner clamping assembly and the outer clamping assembly to clamp and fix the gear workpiece by using the lifting plate 7 to move up and down, so that the gear workpiece clamping and fixing is more convenient. The inner clamping assembly is composed of three second clamping blocks 4 distributed equidistantly around the circumference, and the three second clamping blocks 4 clamp and fix the inner wall of the gear workpiece at the same time. The outer clamping assembly is composed of three first clamping blocks 2 distributed equidistantly around the circumference, and the three first clamping blocks 2 clamp and fix the outer end of the gear workpiece at the same time. Through multi-point clamping, the deviation of the workpiece during the processing can be effectively reduced, ensuring that the workpiece is evenly and firmly clamped and fixed, thereby improving the accuracy and stability of the gear workpiece processing.

[0038] Step 4: Two guide rods 63 are symmetrically fixedly installed on the upper end of the bottom plate 6. Both guide rods 63 are movable and penetrate the lifting plate 7, which guide the movement of the lifting plate 7, prevent the lifting plate 7 from lateral position deviation, and ensure that each rack 73 is stably engaged with each gear 23, thereby ensuring the switching and fixing of the inner clamping assembly and the outer clamping assembly, and the structural design is reasonable;

[0039] The fifth step is to slide the slide rod 41 in the accommodating groove 31, and the limiting blocks 43 are fixedly installed on both sides of the end of the second clamping block 4. Each limiting block 43 is slidably installed in the limiting groove, which limits the movement of the second clamping block 4 and prevents the second clamping block 4 from being separated from the telescopic table 3. Connecting blocks 55 are fixedly installed at both ends of the circular block 2 5, and a through rod 56 is movably penetrated in each connecting block 55, which limits the movement of the circular block 2 5, so that the circular block 2 5 can only move in the vertical direction, ensuring that the push block 51 stably applies force to the contact block 44 during the movement, thereby ensuring the stable use of the inner clamping assembly.

[0040] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A combined fixture for machining automobile gearbox gears, comprising a clamping platform (1), characterized in that: An inner clamping assembly is provided on the clamping platform (1), and the inner clamping assembly comprises three first clamping blocks (2) equidistantly distributed on the clamping platform (1), a cross slide block (21) is fixedly mounted on the bottom end of each first clamping block (2), a screw rod (22) is threadedly connected through each cross slide block (21), and a gear (23) is fixedly mounted on one end of each screw rod (22); The clamping platform (1) is provided with an external clamping assembly, the external clamping assembly comprising a telescopic platform (3), a second clamping block (4) and a second circular block (5), the number of the second clamping blocks (4) being the same as the number of the first clamping blocks (2), the end of each second clamping block (4) being fixedly mounted with a slide bar (41), the bottom of each slide bar (41) being fixedly mounted with a contact block (44), the upper end of the second circular block (5) being fixedly mounted with three push blocks (51) at equal intervals, each push block (51) being respectively fitted with a surface of the contact block (44), and the fitted surfaces are all designed as inclined surfaces; Wherein, a pushing assembly is arranged below the clamping platform (1), the pushing assembly comprising a bottom plate (6) and a lifting plate (7), and a cylinder (61) is installed on the bottom plate (6); The second round block (5) is located below the three contact blocks (44), and connecting blocks (55) are fixedly installed at both ends of the second round block (5), and a through rod (56) is movably penetrated in each of the connecting blocks (55), and each of the through rods (56) is fixedly installed in the telescopic platform (3), wherein a second round rod (52) is fixedly installed at the bottom end of the second round block (5), and a third round block (53) is fixedly installed at the bottom end of the second round rod (52), and a third spring (54) is movably sleeved on the second round rod (52); Four stoppers (33) are fixedly mounted at equidistant intervals on the outer end of the telescopic platform (3); a circular plate (32) is fixedly mounted on the bottom end of the telescopic platform (3); wherein the second circular rod (52) movably penetrates the middle of the circular plate (32); the circular block three (53) is fixedly connected to the bottom end of the circular plate (32) via a third spring (54); first circular rods (34) are fixedly mounted on both sides of the bottom end of the circular plate (32); each of the first circular rods (34) is movably sleeved with a first spring (35); a circular block one (36) is fixedly mounted on the bottom end of each of the first circular rods (34); and two first circular rods (34) are respectively located on both sides of the second circular rod (52); The clamping platform (1) is located above the bottom plate (6), and the lifting plate (7) is located between the clamping platform (1) and the bottom plate (6). Three racks (73) are fixedly installed at equal intervals on the upper end of the lifting plate (7), and each of the gears (23) is respectively meshed with the racks (73). A connecting plate (62) is fixedly installed on the upper end of the telescopic rod of the cylinder (61), and the connecting plate (62) is fixedly connected to the bottom end of the lifting plate (7); A through opening (71) is provided in the middle of the surface of the lifting plate (7), a cylinder (72) is fixedly installed in the middle of the bottom end of the lifting plate (7), the bottom end of the circular plate (32) passes through the through opening (71) and is movably inserted into the cylinder (72), wherein each of the first circular rods (34) movably penetrates the bottom of the cylinder (72), the circular plate (32) is fixedly connected to the bottom surface of the inner wall of the cylinder (72) via two first springs (35), and each of the circular blocks (36) is located below the cylinder (72); There is a gap between the circular block three (53) and the bottom surface of the inner wall of the cylinder (72); four mounting blocks (64) are fixedly mounted on the bottom end of the bottom plate (6); each of the mounting blocks (64) is T-shaped; two guide rods (63) are fixedly connected between the bottom plate (6) and the clamping platform (1); each of the guide rods (63) movably penetrates the lifting plate (7); The second round block (5) is slidably mounted in the telescopic platform (3), and the second round block (5) is located at the bottom side of the inner cavity of the telescopic platform (3), wherein the upper end of the second round rod (52) is movably inserted into the telescopic platform (3), and there is a gap between the four stop blocks (33) and the bottom end of the clamping platform (1).

2. The combined fixture for machining automobile gearbox gears according to claim 1, characterized in that: A circular hole (12) is provided in the middle of the surface of the clamping platform (1); The surface circumference of the clamping platform (1) is provided with three slide grooves (11) at equal intervals, each of the screw rods (22) is rotatably mounted in the slide groove (11), and each of the cross slide blocks (21) is slidably mounted in the slide groove (11).

3. The combined fixture for machining automobile gearbox gears according to claim 1, characterized in that: The telescopic platform (3) movably penetrates the circular hole (12), and three receiving grooves (31) are equidistantly provided on the circumference of the side surface of the telescopic platform (3), and each of the second clamping blocks (4) is slidably mounted in the receiving groove (31); Wherein, both inner walls of the receiving groove (31) are provided with limiting grooves, both sides of the end of each second clamping block (4) are fixedly mounted with limiting blocks (43), and each limiting block (43) is slidably mounted in the limiting groove.

4. The combined fixture for machining automobile gearbox gears according to claim 3 is characterized in that: A group of second springs (42) is fixedly mounted on each of the second clamping blocks (4); Each of the second clamping blocks (4) is fixedly connected to the side wall of the accommodating groove (31) via a group of second springs (42).

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