Steel plate spring pre-pressing device

Abstract

The invention relates to the technical field of steel plate spring machining, in particular to a steel plate spring pre-pressing device which comprises a base, a fixing block and a pre-pressing mechanism matched with the fixing block are arranged on the base, and auxiliary mechanisms are arranged on the two sides of the pre-pressing mechanism. The pre-pressing mechanism comprises a fixed seat fixedly connected with the base, a threaded rod is rotationally connected to the fixed seat, a sleeve is in threaded connection with the threaded rod, a movable seat is rotationally connected to the outer side of the sleeve, and a driving motor is arranged on the outer side of the fixed seat. According to the steel plate spring pre-pressing device, the pre-pressing amount is determined by combining theoretical calculation with actual experience and integrating factors such as the purpose and the working load of the steel plate spring, the push plate with the corresponding thickness is replaced, then the drive motor drives the push plate to move to pre-press the steel plate spring, and when the displacement value of the push plate reaches the pre-pressing amount, the drive motor cannot drive the push plate to move any more; precise control over the pre-pressing amount is achieved, and therefore the performance of the steel plate spring is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of leaf spring processing, and in particular to a leaf spring preloading device. Background Art

[0002] Automobile leaf springs are a common suspension system component used to support and connect the chassis and body of a car. They are composed of multiple layers of bent steel plates and are installed between the wheels and chassis of the vehicle to play a supporting and shock-absorbing role. During the processing of automobile leaf springs, the original steel plates are bent and assembled to form the shape of the spring. Due to the elasticity of the material, a certain degree of deformation may occur during the processing, resulting in the spring not being completely consistent with the shape required by the design.

[0003] The preload device can apply an appropriate amount of pressure to the spring to restore it to the designed shape and keep it stable during subsequent use. However, it is difficult for existing preload devices to accurately control the preload amount. Inaccurate preload amounts may cause the preload to not meet design requirements and affect the performance of the leaf spring. Excessive preload may cause the leaf spring to exceed its elastic limit and cause irreversible deformation. If the preload amount is too small, the internal stress generated by the leaf spring during the manufacturing process cannot be effectively eliminated, affecting its performance. Summary of the invention

[0004] The purpose of the present invention is to propose a leaf spring preloading device in order to solve the above-mentioned problem.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A leaf spring preloading device comprises a base, a fixing block and a preloading mechanism matched with the fixing block are arranged on the base, and auxiliary mechanisms are arranged on both sides of the preloading mechanism; The cam is provided with a toothed structure which is adapted to rotate the movable member so as to move the movable member into contact with the movable member so as to move the movable member into contact with the movable member.

[0006] Preferably, the limiting groove is arranged in a V-shape, the through groove is provided with a spring, and the two ends of the spring are respectively fixedly connected to the inner top surface wall of the through groove and the upper end surface of the slide plate.

[0007] Preferably, a plurality of the card slots are provided, and the plurality of card slots are distributed in a ring array about the axis of the sleeve.

[0008] Preferably, two sliding rods are fixedly connected to the fixed seat, the two sliding rods are respectively located on both sides of the threaded rod, the movable seat is slidably connected to the two sliding rods respectively, and the two sliding rods and the threaded rod are arranged parallel to each other.

[0009] Preferably, the auxiliary mechanism includes a bottom plate slidably connected to the base, a base is fixedly connected to the bottom plate, a connecting seat 1 and a connecting seat 2 are fixedly connected to the base, a connecting seat 1 is rotatably connected to a connecting rod 1, a connecting seat 2 is rotatably connected to a connecting rod, an end of the connecting rod 1 away from the connecting seat 1 is rotatably connected to a transmission rod, an end of the connecting rod 2 away from the connecting seat 2 is rotatably connected to an end of the transmission rod away from the connecting rod 1, a side of the transmission rod close to the connecting rod 2 is fixedly connected to a transmission plate, a hydraulic rod is rotatably connected to the bottom plate, an output end of the hydraulic rod is rotatably connected to the lower end of the transmission plate, a side of the connecting rod 1 away from the connecting rod 2 is fixedly connected to a swing arm, and a clamping assembly is provided on the swing arm.

[0010] Preferably, the clamping assembly comprises a fixing frame fixedly connected to one end of the swing arm away from the connecting rod, the fixing frame is rotatably connected to a rotating arm, and the rotating arm is rotatably connected to a clamping wheel 1 and a clamping wheel 2 respectively.

[0011] Preferably, the rotating arm is L-shaped, the first pressing wheel and the second pressing wheel are rotatably connected to the two ends of the rotating arm respectively, and the middle part of the rotating arm is rotatably connected to the fixing frame.

[0012] Preferably, a stopper is fixedly connected to the fixing frame, and the stopper is in contact with the rotating arm.

[0013] Preferably, two fixing blocks are provided, and an operating channel is opened between the two fixing blocks.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present application is provided with a preloading mechanism, which determines the preloading amount through theoretical calculation combined with practical experience, and comprehensively considers factors such as the purpose and working load of the leaf spring, replaces a push plate of corresponding thickness, and then drives the push plate to move to achieve preloading of the leaf spring through a driving motor. When the displacement value of the push plate reaches the preloading amount, the driving motor can no longer drive the push plate to move, thereby achieving precise control of the preloading amount, avoiding the leaf spring exceeding its elastic limit due to excessive preloading and causing irreversible deformation, and also avoiding the failure to effectively eliminate the internal stress generated in the manufacturing process of the leaf spring due to too small preloading, thereby affecting its performance, thereby ensuring the performance of the leaf spring.

[0015] 2. The present application is provided with an auxiliary mechanism. Before the pre-stressing mechanism is used to pre-stress the leaf spring, the auxiliary mechanism is used to press the leaf spring in both horizontal and vertical directions, thereby dispersing the force on the subsequent push plate and avoiding dislocation or deviation of the leaf spring during the pre-stressing process, thereby avoiding abnormal friction and stress during pre-stressing, and ensuring the mechanical properties of the leaf spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of a pre-pressing device provided according to an embodiment of the present invention is shown.

[0017] Figure 2 A schematic structural diagram of a pre-pressing mechanism provided according to an embodiment of the present invention is shown.

[0018] Figure 3 A cross-sectional view of the internal structure of a moving base provided according to an embodiment of the present invention is shown.

[0019] Figure 4 An exploded view of a local structure of a pre-pressing mechanism provided according to an embodiment of the present invention is shown.

[0020] Figure 5 A schematic diagram of the auxiliary mechanism structure provided according to an embodiment of the present invention is shown.

[0021] Figure 6 A schematic structural diagram of a clamping assembly provided according to an embodiment of the present invention is shown.

[0022] Legend: 1. Base; 2. Fixed block; 3. Working channel; 4. Fixed seat; 5. Threaded rod; 6. Sliding rod; 7. Driving motor; 8. Moving seat; 9. Connecting arm; 10. Push plate; 11. Sleeve; 12. Slot; 13. Slide; 14. Through slot; 15. Slide plate; 16. Spring; 17. Sliding block; 18. Limiting slot; 19. Limiting rod; 20. Bottom plate; 21. Base; 22. Connecting seat 1; 23. Connecting seat 2; 24. Connecting rod 1; 25. Connecting rod 2; 26. Transmission rod; 27. Transmission plate; 28. Hydraulic rod; 29. ​​Swing arm; 30. Fixed frame; 31. Rotating arm; 32. Clamping wheel 1; 33. Clamping wheel 2; 34. Block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-6 , the present invention provides a technical solution: A preloading device for a leaf spring comprises a base 1, a fixed block 2 and a preloading mechanism matched with the fixed block 2 are arranged on the base 1, and auxiliary mechanisms are arranged on both sides of the preloading mechanism; the preloading mechanism comprises a fixed seat 4 fixedly connected to the base 1, a threaded rod 5 is rotatably connected to the fixed seat 4, a sleeve 11 is threadedly connected to the threaded rod 5, a movable seat 8 is rotatably connected to the outer side of the sleeve 11, a driving motor 7 is arranged on the outer side of the fixed seat 4, the output end of the driving motor 7 is coaxially fixedly connected to the threaded rod 5, a connecting arm 9 is fixedly connected to the movable seat 8, and a connecting arm 9 is arranged at the front end thereof. A push plate 10 is provided, a slide groove 13 is provided on the movable seat 8, a slider 17 is slidably connected in the slide groove 13, a limit groove 18 is provided on the slider 17, through grooves 14 connected to the slide groove 13 are provided at the upper and lower ends of the slide groove 13, a slide plate 15 is slidably connected in the through groove 14, both sides of the slide plate 15 are fixedly connected with limit rods 19, the limit rods 19 are slidably connected to the limit groove 18, a card slot 12 is provided on the outer periphery of the sleeve 11, the lower end of the slide plate 15 passes through the through groove 14 and cooperates with the card slot 12, and both ends of the slider 17 extend to the outside of the slide groove 13. Preferably, the push plate 10 and the connecting arm 9 are detachably connected, and push plates 10 of different thicknesses can be selected and updated according to the pre-stressing requirements and pre-stressing amounts of different leaf springs, to ensure that the displacement value of the push plate 10 close to the leaf spring side matches the pre-stressing amount required by the leaf spring, so that the pre-stressing amount required by the leaf spring is just achieved when the push plate 10 reaches the maximum stroke. When the push plate 10 reaches the maximum stroke, the drive motor 7 can no longer drive the push plate 10 to move, thereby achieving precise control of the pre-stressing amount, avoiding the leaf spring exceeding its elastic limit due to excessive pre-stressing and causing irreversible deformation, and also avoiding the inability to effectively eliminate the internal stress generated by the leaf spring during the manufacturing process due to too small pre-stressing, thereby affecting its performance.

[0025] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, the limit groove 18 is arranged in a V shape, and the through groove 14 is provided with a spring 16, and the two ends of the spring 16 are respectively fixedly connected to the inner top surface wall of the through groove 14 and the upper end surface of the slide plate 15. A plurality of slots 12 are provided, and the plurality of slots 12 are distributed in a ring array about the axis of the sleeve 11. Two slide bars 6 are fixedly connected to the fixed seat 4, and the two slide bars 6 are respectively located on both sides of the threaded rod 5. The movable seat 8 is respectively slidably connected to the two slide bars 6, and the two slide bars 6 and the threaded rod 5 are arranged parallel to each other. The arrangement of the slide bars 6 ensures the stability of the movable seat 8 during the movement process.

[0026] Specifically, Figure 1 , Figure 5 and Figure 6As shown, the auxiliary mechanism includes a bottom plate 20 slidably connected to the base 1, a base 21 is fixedly connected to the bottom plate 20, a connecting seat 1 22 and a connecting seat 23 are fixedly connected to the base 21, a connecting rod 1 24 is rotatably connected to the connecting seat 1 22, a connecting rod 25 is rotatably connected to the connecting seat 2 23, the connecting rod 1 24 is rotatably connected to an end thereof away from the connecting seat 1 22, an end of the connecting rod 25 away from the connecting seat 2 23 is rotatably connected to an end of the transmission rod 26 away from the connecting rod 1 24, a side of the transmission rod 26 close to the connecting rod 25 is fixedly connected to a transmission plate 27, a hydraulic rod 28 is rotatably connected to the bottom plate 20, an output end of the hydraulic rod 28 is rotatably connected to the lower end of the transmission plate 27, a side of the connecting rod 1 24 away from the connecting rod 2 25 is fixedly connected to a swing arm 29, and a clamping assembly is provided on the swing arm 29. The clamping assembly includes a fixed frame 30 fixedly connected to one end of the swing arm 29 away from the connecting rod 1 24, a rotating arm 31 is rotatably connected to the fixed frame 30, and a pressing wheel 1 32 and a pressing wheel 2 33 are rotatably connected to the rotating arm 31. The rotating arm 31 is L-shaped, and the pressing wheel 1 32 and the pressing wheel 2 33 are rotatably connected to the two ends of the rotating arm 31, respectively, and the middle part of the rotating arm 31 is rotatably connected to the fixed frame 30. A stopper 34 is fixedly connected to the fixed frame 30, and the stopper 34 is in contact with the rotating arm 31. Preferably, the bottom plate 20 is connected to the base 1 in a self-locking sliding manner, which is convenient for adjusting the position of the bottom plate 20 and locking it after the adjustment is completed; by setting the stop block 34, the rotating arm 31 cannot be deflected too much under the gravity of the clamping wheel 1 32 and the clamping wheel 2 33, that is, the clamping wheel 1 32 and the clamping wheel 2 33 are able to remain above the leaf spring when there is no external force, that is, before contacting the leaf spring, the clamping wheel 2 33 can remain above the leaf spring, and the clamping wheel 1 32 can remain on the side of the leaf spring close to the push plate 10, that is, slightly lower than the height position of the upper end surface of the leaf spring, which can ensure that the clamping wheel 1 32 and the clamping wheel 2 33 can clamp the leaf spring from two directions without the need for additional manual adjustment.

[0027] Specifically, Figure 1 As shown, two fixing blocks 2 are provided, and an operation channel 3 is opened between the two fixing blocks 2. Preferably, a perforating screw can be inserted into the drilled hole of the leaf spring before pre-stressing, which can further prevent the leaf spring from being misaligned during pre-stressing, and the leaf spring can be directly assembled in the operation channel 3 after the pre-stressing is completed.

[0028] In summary, the leaf spring preloading device provided in this embodiment, when in use, firstly places the leaf spring between the fixed block 2 and the push plate 10, and aligns the middle part of the leaf spring with the working channel 3, and pulls the transmission plate 27 downward through the hydraulic rods 28 on the two auxiliary mechanisms, so that the transmission rod 26 moves upward close to the swing arm 29, thereby driving the swing arm 29 to deflect and move downward, and then pulls the transmission rod 26 to move in the direction close to the swing arm 29, so that the connection between the transmission rod 26 and the connecting rod 25 is also deflected in the direction close to the swing arm 29, thereby causing the fixing frame 30 to move downward until the clamping wheel 1 32 and the clamping wheel 2 are connected. The first and second clamping wheels 33 move closer to the leaf spring from the horizontal and vertical directions respectively, until the clamping wheel 1 32 clamps the leaf spring from the side away from the fixed block 2, and the clamping wheel 2 33 clamps the leaf spring from the top, and then the preload is determined by theoretical calculation combined with practical experience, and the purpose of the leaf spring, working load and other factors are comprehensively considered, and the push plate 10 of corresponding thickness is replaced, and the threaded rod 5 is driven by the driving motor 7 to rotate. At this time, the slide plate 15 is stuck in the slot 12, and the limit rod 19 is located in the middle part of the limit slot 18, that is, at the lowest point, so that the sleeve 11 cannot rotate on its own, thereby driving the sleeve 11 and the moving seat 8 to move until one end of the slider 17 is aligned with the fixed block 18. The fixed seat 4 contacts, and the moving seat 8 continues to move, so that the slider 17 and the moving seat 8 are relatively displaced, that is, the slider 17 and the slide plate 15 are relatively displaced, so that the limit rod 19 and the limit groove 18 are relatively displaced, so that the height position of the limit rod 19 changes, thereby driving the slide plate 15 to slide in the through groove 14, so that the lower end of the slide plate 15 is disengaged from the card slot 12, and the spring 16 is compressed. The sleeve 11 without the restriction of the slide plate 15 rotates under the rotation of the threaded rod 5 and cannot drive the moving seat 8 to move. At this time, the push plate 10 connected to the moving seat 8 just reaches the maximum displacement value, which is consistent with the pre-calculated The movable seat 8 and the push plate 10 can no longer move after the pre-compression of the leaf spring is achieved, so as to avoid excessive pre-compression causing the leaf spring to exceed its elastic limit and cause irreversible deformation. At this time, the leaf spring can be perforated and assembled through the working channel 3. After the assembly is completed, the threaded rod 5 is reversed by driving the motor 7, the movable seat 8 loses the thrust, and the compressed spring 16 needs to be restored to its original state, pushing the slide plate 15 down and re-matching with the rotating sleeve 11, so that the lower end of the slide plate 15 is re-stuck in the slot 12, the limit rod 19 returns to the middle part of the limit slot 18, and the slider 17 is also reset.

[0029] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A leaf spring preloading device, comprising a base (1), characterized in that: The base (1) is provided with a fixing block (2) and a pre-pressing mechanism matched with the fixing block (2), and auxiliary mechanisms are provided on both sides of the pre-pressing mechanism; The pre-pressing mechanism comprises a fixed seat (4) fixedly connected to the base (1), a threaded rod (5) being rotatably connected to the fixed seat (4), a sleeve (11) being threadably connected to the threaded rod (5), a movable seat (8) being rotatably connected to the outer side of the sleeve (11), a driving motor (7) being provided on the outer side of the fixed seat (4), an output end of the driving motor (7) being coaxially fixedly connected to the threaded rod (5), a connecting arm (9) being fixedly connected to the movable seat (8), a push plate (10) being provided at the front end of the connecting arm (9), a slide groove (13) being provided on the movable seat (8), a sliding connection (13) being provided in the slide groove (13) A slider (17) is connected, and a limit groove (18) is provided on the slider (17). The slide groove (13) is provided with through grooves (14) in communication with the slide groove (13) at the upper and lower ends thereof. A slide plate (15) is slidably connected in the through groove (14). Both sides of the slide plate (15) are fixedly connected with limit rods (19), and the limit rods (19) are slidably connected with the limit groove (18). A clamping groove (12) is provided on the outer periphery of the sleeve (11), and the lower end of the slide plate (15) passes through the through groove (14) and cooperates with the clamping groove (12). Both ends of the slider (17) extend to the outside of the slide groove (13).

2. A leaf spring preloading device according to claim 1, characterized in that: The limiting groove (18) is arranged in a V shape, the through groove (14) is provided with a spring (16), and the two ends of the spring (16) are respectively fixedly connected to the inner top surface wall of the through groove (14) and the upper end surface of the slide plate (15).

3. A leaf spring preloading device according to claim 2, characterized in that: A plurality of the card slots (12) are provided, and the plurality of card slots (12) are distributed in a ring array about the axis of the sleeve (11).

4. A leaf spring preloading device according to claim 1, characterized in that: The fixed seat (4) is fixedly connected to two sliding rods (6), the two sliding rods (6) are respectively located on both sides of the threaded rod (5), the movable seat (8) is respectively slidably connected to the two sliding rods (6), and the two sliding rods (6) and the threaded rod (5) are arranged parallel to each other.

5. A leaf spring preloading device according to claim 1, characterized in that: The auxiliary mechanism comprises a bottom plate (20) slidably connected to the base (1); the bottom plate (20) is fixedly connected to a base (21); the base (21) is fixedly connected to a first connecting seat (22) and a second connecting seat (23); the first connecting seat (22) is rotatably connected to a first connecting rod (24); the second connecting seat (23) is rotatably connected to a second connecting rod (25); one end of the first connecting rod (24) away from the first connecting seat (22) is rotatably connected to a transmission rod (26); the second connecting rod (25) is rotatably connected to a transmission rod (26). ) is rotatably connected to one end of the transmission rod (26) away from the connecting seat two (23), and the transmission rod (26) is fixedly connected to the transmission plate (27) on the side close to the connecting rod two (25). A hydraulic rod (28) is rotatably connected to the bottom plate (20), and the output end of the hydraulic rod (28) is rotatably connected to the lower end of the transmission plate (27). A swing arm (29) is fixedly connected to the side of the connecting rod one (24) away from the connecting rod two (25), and a clamping assembly is provided on the swing arm (29).

6. A leaf spring preloading device according to claim 5, characterized in that: The clamping assembly comprises a fixed frame (30) fixedly connected to an end of the swing arm (29) away from the first connecting rod (24), the fixed frame (30) being rotatably connected to a rotating arm (31), and the rotating arm (31) being rotatably connected to a first clamping wheel (32) and a second clamping wheel (33).

7. A leaf spring preloading device according to claim 6, characterized in that: The rotating arm (31) is L-shaped, the first pressing wheel (32) and the second pressing wheel (33) are rotatably connected to two ends of the rotating arm (31), respectively, and the middle part of the rotating arm (31) is rotatably connected to the fixing frame (30).

8. A leaf spring preloading device according to claim 7, characterized in that: A stopper (34) is fixedly connected to the fixing frame (30), and the stopper (34) is in close contact with the rotating arm (31).

9. A leaf spring preloading device according to claim 1, characterized in that: Two fixing blocks (2) are provided, and an operation channel (3) is provided between the two fixing blocks (2).

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