A special fixture for processing lifting ear holes of leaf springs

Abstract

The invention provides a special fixture for processing a lifting ear hole of a leaf spring, and relates to the technical field of fixtures for processing lifting ear holes, comprising a processing table, a fixed disk is arranged above the processing table, a cross slide groove is evenly and equidistantly opened on the upper end of the fixed disk, an inner disk is fixedly installed inside the fixed disk, an adjustment table is threadedly installed inside the inner disk, a toothed disk is rotatably installed in the inner wall of the fixed disk, a guide bar is fixedly installed on the upper end of the toothed disk, a first screw is symmetrically fixedly installed on the side wall of the fixed disk, a guide mechanism is symmetrically arranged on the upper end of the fixed disk, the guide mechanism comprises vertical rods, two vertical rods are symmetrically fixedly installed on the fixed disk, inner grooves are opened inside the two vertical rods, the lifting ear of the leaf spring can be supported by fixing near the processing area, the phenomenon of local stress concentration can be reduced, the overall stability of the placement of the lifting ear of the leaf spring can be increased, the vibration or displacement of the lifting ear of the leaf spring can be avoided, and the continuity and safety of the processing process can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting ear hole processing fixtures, and more specifically, particularly relates to a special fixture for processing lifting ear holes of leaf springs. Background Art

[0002] The leaf spring hanger is an important component in the automobile suspension system. It is mainly used to fix and support the leaf spring to ensure that the weight of the vehicle is evenly distributed when carrying loads and maintain the stability and driving comfort of the vehicle. The hanger is usually connected to other components through holes. The processing quality and precision of these holes directly affect the performance of the entire suspension system.

[0003] However, the existing special fixture for processing the lifting ear holes of leaf springs still has the following shortcomings when used:

[0004] 1. Most of the existing special fixtures for processing the lifting ear holes of leaf springs have fewer or relatively single fixed points during processing. Single-point or few-point fixation often cannot evenly distribute the clamping force, which easily causes the workpiece to rotate or move during the processing, resulting in offset of the hole processing position or inaccurate size.

[0005] 2. Most of the existing special fixtures for processing leaf spring ear holes are designed to be fixed, with little or no room for adjustment. If there is a slight change in the workpiece size or tolerance, the existing fixture may be difficult to accurately align, affecting the positioning accuracy of the hole processing, resulting in a decrease in the product qualification rate. When it is necessary to replace and process different types of ear holes, the existing fixture may require more manual adjustment time, or disassembly and replacement, which reduces production efficiency and increases downtime.

[0006] Therefore, in view of this, the existing structure and defects are studied and improved, and a special fixture for processing the lifting ear holes of leaf springs is provided, in order to achieve a more practical purpose. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a special fixture for processing the lifting ear holes of a leaf spring to solve the above problems.

[0008] A special fixture for processing lifting ear holes of leaf springs, comprising a processing table, a fixed disk is arranged above the processing table, a cross slide groove is evenly and equidistantly opened on the upper end of the fixed disk, an inner disk is fixedly installed inside the fixed disk, an adjustment table is threadedly installed inside the inner disk, a toothed disk is rotatably installed in the inner wall of the fixed disk, a guide bar is fixedly installed on the upper end of the toothed disk, a first screw is symmetrically fixedly installed on the side wall of the fixed disk, and first threaded rings are symmetrically threadedly installed on two of the first screws, a bracket is evenly and equidistantly fixedly installed on the upper end of the processing table, a driving motor is fixedly installed on the bracket located on the left side, a gear is installed on the output shaft of the driving motor, and the gear is meshed with the toothed disk;

[0009] The upper end of the fixed plate is symmetrically provided with a guide mechanism;

[0010] The guide mechanism comprises a vertical rod, and two vertical rods are symmetrically fixedly mounted on a fixed plate, and inner grooves are provided inside the two vertical rods.

[0011] Preferably, L-shaped rods are slidably installed inside the two inner grooves, first springs are fixedly installed at the lower ends of the two L-shaped rods, and one end of the two first springs away from the two L-shaped rods is fixedly connected to the inner walls of the two inner grooves respectively.

[0012] Preferably, a fixing ring is fixedly installed between the two L-shaped rods, and a guide ring is fixedly installed on the fixing ring.

[0013] Preferably, cross blocks are slidably installed inside the three cross slides, guide grooves are opened at the lower ends of the three cross blocks, and the three guide grooves are adapted to the guide bars.

[0014] Preferably, a second screw is fixedly installed on the upper end of the three cross blocks, a second threaded ring is threadedly installed on the three second screws, a limiting groove is opened inside the three cross blocks, and an insertion rod is slidably installed inside the three limiting grooves.

[0015] Preferably, the side walls of the three insertion rods are each provided with a first arc groove, the three second threaded rings are rotatably mounted in the three first arc grooves respectively, and the upper ends of the three insertion rods are each fixedly mounted with an arc sheet.

[0016] Preferably, the three arc-shaped pieces are symmetrically provided with second arc-shaped grooves, the two groups of the second arc-shaped grooves are symmetrically and slidably provided with moving blocks, and each of the moving blocks is threadably provided with a third screw.

[0017] Preferably, each of the third screw rods has a side wall symmetrically provided with strip grooves, and each of the third screw rods has a third threaded ring threadedly mounted on it.

[0018] Preferably, an inner column is slidably installed inside each of the third screw rods, and sliding blocks are symmetrically fixedly installed on the side walls of each of the inner columns, and each group of the sliding blocks is slidably installed in each group of strip grooves.

[0019] Preferably, a second spring is fixedly mounted on the side wall of each inner column, one end of each second spring away from each inner column is fixedly connected to the third screw rod, and a clamping block is fixedly mounted on one end of each inner column away from the second spring.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, a fixed disk, an inner disk, an adjustment platform, a toothed disk, a guide strip, a driving motor, a gear, a cross block, a limit slot, an insertion rod, an arc-shaped sheet, a moving block, and a clamping block are provided. When the installation position of the leaf spring lifting ear is vacant, the leaf spring lifting ear can be placed on the adjustment platform. At this time, the placement height can be adjusted by rotating the adjustment platform on the inner disk. Then the driving motor can be started. The gear will be driven to rotate under the action of the driving motor. The rotation of the gear will drive the toothed disk meshing with the toothed disk to rotate inside the fixed disk. When the toothed disk rotates, the guide strip will be driven to rotate. When the guide bar rotates, the three cross blocks will be driven to move toward the middle in the three cross slots. At this time, the three cross blocks will drive the three limit slots to move toward the middle, and the three limit slots will drive the three plug rods to move toward the middle. At this time, the three plug rods will drive the three arc pieces to move toward the middle, and the three arc pieces will drive the moving blocks and the clamping blocks to move toward the middle, and then the side walls of the leaf spring ears are fixed by the clamping blocks, which enhances the symmetry and balance of the equipment fixation, reduces the stress concentration points, and effectively avoids the deformation problem caused by excessive local force.

[0022] In the present invention, by providing the first spring, the fixing ring and the guide ring, when the leaf spring lifting ear is fixed, the guide ring is released, and the two first springs will restore elastic force, thereby driving the fixing ring and the guide ring to move downward, and the fixing ring will contact the end surface of the leaf spring lifting ear at this time, thereby clamping the processing area position against it, and by fixing the vicinity of the processing area, the leaf spring lifting ear can be supported, the phenomenon of local stress concentration can be reduced, the overall stability of the placement of the leaf spring lifting ear can be increased, the leaf spring lifting ear can be prevented from vibrating or shifting, and the continuity and safety of the processing process can be ensured;

[0023] In the present invention, by providing a guide ring, the drill bit can be guided to be finally perpendicular to the processing surface, thereby reducing deformation caused by uneven clamping force and ensuring the verticality and position accuracy of the hole;

[0024] In the present invention, by providing the limiting groove, the insert rod, the arc-shaped piece, the second arc-shaped groove and the moving block, the rotation of the second threaded ring will drive the three insert rods to slide upward inside the three limiting grooves, and at this time, the three insert rods will drive the three arc-shaped pieces and the moving block to move upward, thereby adjusting the vertical fixed position, and then the three groups of moving blocks can be slid inside the three groups of second arc-shaped grooves, and the horizontal fixed position can be adjusted under the movement of the three groups of moving blocks, so that the fixed position of the device is flexible and changeable when in use, and is suitable for use with different types of leaf spring lifting ears, thereby enhancing versatility and flexibility;

[0025] In the present invention, by providing a third screw, a third threaded ring, an inner column and a clamping block, the rotation of the third screw will drive the inner column and the clamping block to move and adjust, so that the clamp can fine-tune the clamping force of each clamping point, so that it is suitable for slight unevenness of the workpiece surface, so as to automatically compensate for slight deformation during use. Moreover, through the design of the third threaded ring, when fixing the leaf spring ear, the third threaded ring can be rotated on the third screw first, and the position of the third threaded ring on the third screw can be adjusted, so as to accurately adjust the compensation range of the equipment in use, and ensure that the clamping force is more evenly distributed.

[0026] In the present invention, by providing a first screw rod and a first threaded ring, two groups of first threaded rings are rotated on the two first screw rods. When the two groups of first threaded rings are rotated, they will respectively fit with the upper and lower ends of the tail of the leaf spring ear, thereby playing an effective auxiliary supporting effect, so that the leaf spring ear can always be in a horizontal position when fixed, further enhancing the fixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional explosion structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the explosion structure of the fixed disk connection of the present invention;

[0030] Figure 4 It is a schematic diagram of the fixed ring connection explosion structure of the present invention;

[0031] Figure 5 It is a schematic diagram of the cross block connection structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the arc-shaped sheet connection explosion structure of the present invention;

[0033] Figure 7 It is a schematic diagram of the mobile block connection explosion structure of the present invention;

[0034] Figure 8 It is a schematic diagram of the explosion structure of the clamp block connection of the present invention.

[0035] In the figure, the corresponding relationship between the component names and the figure numbers is: 11, processing table; 12, fixed plate; 13, cross slide; 14, inner plate; 15, adjustment table; 16, toothed plate; 17, guide strip; 18, first screw; 19, first threaded ring; 21, bracket; 22, drive motor; 23, gear; 24, vertical rod; 25, inner groove; 26, L-shaped rod; 27, first spring; 28, fixed ring; 29, guide ring; 31, cross block; 32, guide groove; 33, second screw; 34, second threaded ring; 35, limit groove; 36, plug rod; 37, first arc groove; 38, arc sheet; 39, second arc groove; 41, moving block; 42, third screw; 43, strip groove; 44, third threaded ring; 45, inner column; 46, slider; 47, second spring; 48, clamping block. DETAILED DESCRIPTION

[0036] 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.

[0037] See also Figure 1-Figure 8 The present invention provides a special fixture for processing the lifting ear holes of a leaf spring, comprising a processing table 11, a fixed plate 12 is arranged above the processing table 11, a cross slide 13 is evenly and equidistantly provided on the upper end of the fixed plate 12, an inner plate 14 is fixedly installed inside the fixed plate 12, an adjustment table 15 is threadedly installed inside the inner plate 14, a toothed plate 16 is rotatably installed in the inner wall of the fixed plate 12, a guide bar 17 is fixedly installed on the upper end of the toothed plate 16, first screws 18 are symmetrically fixedly installed on the side wall of the fixed plate 12, and first threaded rings 19 are symmetrically threadedly installed on the two first screws 18. When the leaf spring is lifted, After the lug is placed, the two sets of first threaded rings 19 can be rotated on the two first screws 18. When the two sets of first threaded rings 19 are rotated, they will fit with the upper and lower ends of the tail of the leaf spring lifting lug respectively, thereby playing an effective auxiliary support effect, so that the leaf spring lifting lug can always be in a horizontal state when fixed, further enhancing the fixing effect. The upper end of the processing table 11 is evenly and equidistantly fixed with a bracket 21, and a driving motor 22 is fixedly installed on the bracket 21 on the left side. A gear 23 is installed on the output shaft of the driving motor 22, and the gear 23 is meshed with the toothed disc 16;

[0038] A guide mechanism is symmetrically arranged on the upper end of the fixed plate 12;

[0039] The guide mechanism includes a vertical rod 24, and the two vertical rods 24 are symmetrically fixedly installed on the fixed plate 12. The two vertical rods 24 are provided with inner grooves 25, and L-shaped rods 26 are slidably installed inside the two inner grooves 25. The lower ends of the two L-shaped rods 26 are fixedly installed with first springs 27, and the ends of the two first springs 27 away from the two L-shaped rods 26 are respectively fixedly connected to the inner walls of the two inner grooves 25. A fixing ring 28 is fixedly installed between the two L-shaped rods 26, and a guide ring 29 is fixedly installed on the fixing ring 28. When the leaf spring ear is fixed, the guide ring 29 is released at this time, and the two first springs 27 will restore the elastic force accordingly. , which will drive the fixing ring 28 and the guide ring 29 to move downward. At this time, the fixing ring 28 will contact the end face of the leaf spring ear, and then clamp the processing area. By fixing the area near the processing area, the leaf spring ear can be supported to reduce the phenomenon of local stress concentration, increase the overall stability of the placement of the leaf spring ear, avoid the vibration or displacement of the leaf spring ear, and ensure the continuity and safety of the processing process. Through the design of the guide ring 29, the drill bit can be guided to be perpendicular to the processing surface, reduce deformation caused by uneven clamping force, and ensure the verticality and position accuracy of the hole.

[0040] A cross block 31 is slidably installed inside the three cross slides 13, and a guide groove 32 is provided at the lower end of the three cross blocks 31. The three guide grooves 32 are adapted to the guide strips 17. A second screw rod 33 is fixedly installed on the upper end of the three cross blocks 31, and a second threaded ring 34 is threadedly installed on the three second screws 33. A limiting groove 35 is provided inside the three cross blocks 31, and a plug rod 36 is slidably installed inside the three limiting grooves 35. The side walls of the three plug rods 36 are provided with a first arc groove 37, and the three second threaded rings 34 are rotatably installed in the three first arc grooves 37 respectively. An arc sheet 38 is fixedly installed on the upper end of the three plug rods 36, and the three arc sheets 38 are symmetrically provided with a second arc groove 39. The moving blocks 41 are symmetrically and slidably installed inside the three second arc grooves 39. When the fixed point needs to be adjusted, the second threaded ring 34 can be rotated on the three second screws 33. The rotation of the second threaded ring 34 will drive the three plug rods 36 to slide upward in the three limit grooves 35. At this time, the three plug rods 36 will drive the three arc pieces 38 and the moving blocks 41 to move upward, and then the vertical fixed position can be adjusted. Then, the three groups of moving blocks 41 can be slid inside the three groups of second arc grooves 39. The horizontal fixed position can be adjusted under the movement of the three groups of moving blocks 41, so that the fixed position of the device is flexible and changeable when in use, and it is suitable for use with different types of leaf spring ears, thereby enhancing versatility and flexibility.

[0041] A third screw 42 is threadedly installed inside each moving block 41, and a strip groove 43 is symmetrically opened on the side wall of each third screw 42. A third threaded ring 44 is threadedly installed on each third screw 42. An inner column 45 is slidably installed inside each third screw 42, and a slider 46 is symmetrically fixedly installed on the side wall of each inner column 45. Each group of sliders 46 is slidably installed in each group of strip grooves 43, and a second spring 47 is fixedly installed on the side wall of each inner column 45. One end of each second spring 47 away from each inner column 45 is fixedly connected to the third screw 42, and one end of each inner column 45 away from the second spring 47 is fixedly installed with a clamping block 48. During processing, the guide can be pulled upward first. The guide ring 29 moves upward, and the fixing ring 28 drives the L-shaped rod 26 to slide upward inside the inner groove 25. The L-shaped rod 26 also drives the first spring 27 to stretch synchronously. When the installation position of the leaf spring lifting ear is vacant, the leaf spring lifting ear can be placed on the adjustment platform 15. The placement height can be adjusted by rotating the adjustment platform 15 on the inner disk 14. Then the drive motor 22 can be started. The drive motor 22 drives the gear 23 to rotate. The gear 23 rotates, and the gear 16 meshing with the gear 23 rotates inside the fixing disk 12. When the gear 16 is in the fixed disk 12, the gear 23 rotates. When rotating, the guide bar 17 will be driven to rotate accordingly. At this time, the rotation of the guide bar 17 will drive the three cross blocks 31 to move toward the middle in the three cross slides 13. At this time, the three cross blocks 31 will drive the three limit grooves 35 to move toward the middle, and the three limit grooves 35 will drive the three plug rods 36 to move toward the middle. At this time, the three plug rods 36 will drive the three arc pieces 38 to move toward the middle. The three arc pieces 38 will drive the moving block 41 and the clamping block 48 to move toward the middle, and then the side wall of the leaf spring ear is fixed by the clamping block 48, which enhances the symmetry and balance of the device fixation, reduces the stress concentration point, and effectively avoids local When in use, the third screw 42 can be rotated inside the movable block 41, and the rotation of the third screw 42 will drive the inner column 45 and the clamping block 48 to move and adjust, so that the clamp can fine-tune the clamping force of each clamping point, so that it is suitable for slight unevenness of the workpiece surface, so as to automatically compensate for slight deformation during use, and through the design of the third threaded ring 44, when fixing the leaf spring ear, the third threaded ring 44 can be rotated on the third screw 42 first, and the position of the third threaded ring 44 on the third screw 42 can be adjusted, so as to accurately adjust the compensation range of the equipment in use, to ensure that the clamping force is more evenly distributed.

[0042] Working principle:

[0043] In the first step, during processing, the guide ring 29 can be pulled upwards first, and the movement of the guide ring 29 will drive the fixing ring 28 to move upwards. At this time, the fixing ring 28 will drive the L-shaped rod 26 to slide upwards inside the inner groove 25. At this time, the L-shaped rod 26 will also synchronously drive the first spring 27 to stretch. When the installation position of the leaf spring ear is vacant, the leaf spring ear can be placed on the adjustment table 15. At this time, the placement height can be adjusted by rotating the adjustment table 15 on the inner disk 14, and then the drive motor 22 can be started. Under the action of the drive motor 22, the gear 23 will be driven to rotate, and the gear 23 will drive the gear disc 16 meshing with it to rotate inside the fixed disk 12. When the gear disc 1 6 will drive the guide bar 17 to rotate when rotating. At this time, the three cross blocks 31 will be driven to move toward the middle in the three cross slides 13 under the rotation of the guide bar 17. At this time, the three cross blocks 31 will drive the three limit grooves 35 to move toward the middle, and the three limit grooves 35 will drive the three plug rods 36 to move toward the middle. At this time, the three plug rods 36 will drive the three arc pieces 38 to move toward the middle. The three arc pieces 38 will drive the moving block 41 and the clamping block 48 to move toward the middle, and then the side wall of the leaf spring ear is fixed by the clamping block 48, which enhances the symmetry and balance of the device fixation, reduces the stress concentration point, and effectively avoids the deformation problem caused by excessive local force;

[0044] In the second step, after the leaf spring ear is fixed, the guide ring 29 is released, and the two first springs 27 will restore the elastic force, thereby driving the fixing ring 28 and the guide ring 29 to move downward. At this time, the fixing ring 28 will contact the end face of the leaf spring ear, thereby clamping the processing area. By fixing the area near the processing area, the leaf spring ear can be supported, the local stress concentration phenomenon can be reduced, the overall stability of the leaf spring ear placement can be increased, and the leaf spring ear vibration or displacement can be avoided, thereby ensuring the continuity and safety of the processing process;

[0045] The third step is to guide the drill bit to be perpendicular to the processing surface through the design of the guide ring 29, reduce the deformation caused by uneven clamping force, and ensure the verticality and position accuracy of the hole;

[0046] The fourth step is that when the fixed point needs to be adjusted, the second threaded ring 34 can be rotated on the three second screw rods 33. The rotation of the second threaded ring 34 will drive the three plug rods 36 to slide upward inside the three limit grooves 35. At this time, the three plug rods 36 will drive the three arc-shaped pieces 38 and the moving blocks 41 to move upward, thereby adjusting the vertical fixed position. Then, the three groups of moving blocks 41 can be slid inside the three groups of second arc grooves 39. The horizontal fixed position can be adjusted under the movement of the three groups of moving blocks 41, so that the fixed position of the device is flexible and changeable when in use, and it is suitable for use with different types of leaf spring lifting ears, thereby enhancing versatility and flexibility.

[0047] The fifth step is to rotate the third screw 42 inside the moving block 41 during use, and the rotation of the third screw 42 will drive the inner column 45 and the clamping block 48 to move and adjust, so that the clamp can fine-tune the clamping force of each clamping point, so that it is suitable for slight unevenness of the workpiece surface, so as to automatically compensate for slight deformation during use. And through the design of the third threaded ring 44, when fixing the leaf spring ear, the third threaded ring 44 can be rotated on the third screw 42 first, and the position of the third threaded ring 44 on the third screw 42 can be adjusted, so as to accurately adjust the compensation range of the equipment during use, so as to ensure that the clamping force is more evenly distributed.

[0048] The sixth step is that after the leaf spring lifting ear is placed, the two sets of first threaded rings 19 can be rotated on the two first screws 18. When the two sets of first threaded rings 19 are rotated, they will fit with the upper and lower ends of the tail of the leaf spring lifting ear respectively, thereby playing an effective auxiliary supporting role, so that the leaf spring lifting ear can always be in a horizontal position when fixed, further enhancing the fixing effect.

[0049] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A special fixture for processing a lifting ear hole of a leaf spring, comprising a processing table (11), a fixing plate (12) being arranged above the processing table (11), characterized in that: The upper end of the fixed disk (12) is provided with cross-shaped sliding grooves (13) at even intervals, an inner disk (14) is fixedly installed inside the fixed disk (12), and an adjustment platform (15) is installed on the inner thread of the inner disk (14); A toothed disc (16) is rotatably mounted in the inner wall of the fixed disc (12), a guide bar (17) is fixedly mounted on the upper end of the toothed disc (16), first screw rods (18) are symmetrically fixedly mounted on the side wall of the fixed disc (12), first threaded rings (19) are symmetrically threadedly mounted on the two first screw rods (18), a bracket (21) is evenly and equidistantly fixedly mounted on the upper end of the processing table (11), a drive motor (22) is fixedly mounted on the bracket (21) located on the left side, a gear (23) is mounted on the output shaft of the drive motor (22), and the gear (23) is meshed with the toothed disc (16); A guide mechanism is symmetrically arranged on the upper end of the fixed plate (12); The guide mechanism comprises a vertical rod (24), wherein two vertical rods (24) are symmetrically fixedly mounted on the fixed plate (12), wherein an inner groove (25) is provided inside the two vertical rods (24), wherein an L-shaped rod (26) is slidably mounted inside the two inner grooves (25), wherein first springs (27) are fixedly mounted at the lower ends of the two L-shaped rods (26), wherein ends of the two first springs (27) away from the two L-shaped rods (26) are respectively fixedly connected to the inner walls of the two inner grooves (25), and a fixing ring (28) is fixedly mounted between the two L-shaped rods (26). A guide ring (29) is fixedly mounted on the fixed ring (28); a cross block (31) is slidably mounted inside each of the three cross slide grooves (13); a limiting groove (35) is provided inside each of the three cross blocks (31); an insertion rod (36) is slidably mounted inside each of the three limiting grooves (35); an arc-shaped piece (38) is fixedly mounted on the upper end of each of the three insertion rods (36); a second arc-shaped groove (39) is symmetrically provided inside each of the three arc-shaped pieces (38); and moving blocks (41) are symmetrically slidably mounted inside each of the two groups of the second arc-shaped grooves (39); Each of the moving blocks (41) is threadedly mounted with a third screw rod (42), each of the third screw rods (42) is slidably mounted with an inner column (45), and each of the inner columns (45) is fixedly mounted with a clamping block (48) on one end away from the second spring (47).

2. A special fixture for processing lifting ear holes of leaf springs as claimed in claim 1, characterized in that: The lower ends of the three cross blocks (31) are each provided with a guide groove (32), and the three guide grooves (32) are each adapted to fit the guide strip (17).

3. A special fixture for processing lifting ear holes of leaf springs as claimed in claim 2, characterized in that: A second screw rod (33) is fixedly mounted on the upper end of each of the three cross blocks (31), and a second threaded ring (34) is threadedly mounted on each of the three second screw rods (33).

4. A special fixture for processing lifting ear holes of leaf springs as claimed in claim 3, characterized in that: A first arc-shaped groove (37) is formed on the side walls of the three insertion rods (36), and the three second threaded rings (34) are rotatably mounted in the three first arc-shaped grooves (37), respectively.

5. A special fixture for processing lifting ear holes of leaf springs as claimed in claim 1, characterized in that: Each of the third screw rods (42) has a side wall symmetrically provided with a strip groove (43); Wherein, each of the third screw rods (42) is threadedly mounted with a third threaded ring (44).

6. A special fixture for processing lifting ear holes of leaf springs as claimed in claim 5, characterized in that: A sliding block (46) is symmetrically fixedly mounted on the side wall of each inner column (45); Wherein, each group of the sliding blocks (46) is slidably mounted in each group of the strip grooves (43).

7. A special fixture for processing lifting ear holes of leaf springs as claimed in claim 6, characterized in that: A second spring (47) is fixedly mounted on the side wall of each inner column (45), and one end of each second spring (47) away from each inner column (45) is fixedly connected to the third screw rod (42).

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