Multi-stage pressing and clamping device for assembling air valve pump

Abstract

The utility model discloses a multi-stage pressing and clamping device for assembling an air valve pump. The multi-stage pressing and clamping device comprises a tool bottom plate and a workpiece positioning plate. A rectangular through hole is formed in the workpiece positioning plate, and a bearing cushion block is arranged in the rectangular through hole; a first profiling positioning seat is arranged at the upper end of the bearing cushion block, and a supporting plate is arranged above the first profiling positioning seat; double-lining type linear bearings are installed on the two sides of the rectangular through hole, first guide shafts are arranged in the double-lining type linear bearings, and the outer walls of the first guide shafts are sleeved with compression springs. Through the cooperation of the force bearing cushion block, the first guide shaft and the compression spring, the clamping force on a workpiece can be accurately controlled, and the workpiece is effectively prevented from being damaged or moving due to improper clamping force, so that the assembly accuracy and quality are guaranteed; through multi-stage supporting and positioning of the supporting plate, the first profiling positioning base and the workpiece supporting column, the stability and accuracy of the workpiece in the assembling process are guaranteed, and the production efficiency and the product quality are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve pump assembly, and particularly relates to a multi-stage pressing and clamping device for assembling an air valve pump. Background Art

[0002] The air valve pump is mainly used in the automobile air suspension system to control the inflation and exhaust and adjust the body posture. It is a solenoid valve. In the process of assembling the valve core of the air valve pump, the clamping device plays a pivotal role. It is a key tool to ensure that the various components of the valve body can be firmly and stably fixed, laying a solid foundation for the subsequent precise assembly operation. The importance of the clamping device is self-evident, and it is directly related to the accuracy and overall quality of the assembly.

[0003] However, the clamping devices commonly used at present are often difficult to accurately control the clamping force. Excessive force may cause damage to the components, while too little force may cause the components to move or fall off during the assembly process, seriously affecting the assembly quality and production efficiency. In addition, the operation is inconvenient and cannot meet the requirements of efficient and accurate assembly. Therefore, the development of a multi-stage clamping device with simple structure, convenient operation and accurate control of the clamping force has important practical value for improving the assembly process of the air valve pump. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a multi-stage clamping device for assembling an air valve pump to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A multi-stage clamping and clamping device for assembling an air valve pump comprises a tooling base plate and a workpiece positioning plate arranged above the tooling base plate, wherein the tooling base plate is movably connected to the workpiece positioning plate; a rectangular through hole is provided on the workpiece positioning plate, wherein a load-bearing pad is arranged in the rectangular through hole; the load-bearing pad is movably connected to the tooling base plate, wherein a load-bearing column is arranged at the lower end of the load-bearing pad, and the lower end of the load-bearing column penetrates the tooling base plate and extends downward; a first contour positioning seat is arranged at the upper end of the load-bearing pad, wherein a support plate is arranged above the first contour positioning seat; double-lined linear bearings are symmetrically installed on the left and right sides of the rectangular through hole, wherein each of the double-lined linear bearings is provided with a first guide shaft adapted thereto; the upper end of the first guide shaft is fixedly connected to the support plate, wherein the lower end of the first guide shaft penetrates downwardly through the tooling base plate and is fixedly connected to the guide shaft support plate; a compression spring is arranged on the outer wall of the first guide shaft, wherein the upper end of the compression spring is fixedly connected to the bottom of the double-lined linear bearing, and the lower end of the compression spring is fixedly connected to the guide shaft support plate.

[0007] Preferably, a second contoured positioning seat is fixedly mounted on a side of the workpiece positioning plate away from the rectangular through hole, wherein the second contoured positioning seat is arranged side by side with the first contoured positioning seat.

[0008] Preferably, a plurality of workpiece support columns are respectively provided on the front and rear sides of the first contoured positioning seat, wherein the workpiece support columns are arranged below the support plate; the lower ends of the workpiece support columns are fixedly connected to the workpiece positioning plate, wherein the top ends of the workpiece support columns are provided with positioning grooves.

[0009] Preferably, the support plate is provided with a plurality of positioning holes corresponding one-to-one to the workpiece support columns, wherein a positioning pin is respectively provided in each positioning hole.

[0010] Preferably, a mounting groove is provided in the middle of the support plate, wherein a positioning guide plate is fixedly installed in the mounting groove; the positioning guide plate is arranged above the first contoured positioning seat, wherein a plurality of valve core positioning holes are provided on the positioning guide plate.

[0011] Preferably, single-line linear bearings are respectively provided at the four corners of the workpiece positioning plate, wherein the single-line linear bearing is provided with a second guide shaft matched therewith; the upper end of the second guide shaft is slidably connected to the single-line linear bearing, wherein the lower end of the second guide shaft is fixedly connected to the tooling base plate.

[0012] Preferably, a first rectangular spring is sleeved on the outer wall of the second guide shaft, wherein the upper end of the first rectangular spring is fixedly connected to the single-liner linear bearing, and the lower end of the first rectangular spring is fixedly connected to the tooling bottom plate.

[0013] Preferably, sliding holes are respectively opened at the four corners of the load-bearing pad, wherein a third guide shaft is respectively arranged in each sliding hole; the upper end of the third guide shaft is slidably connected to the load-bearing pad, wherein the lower end of the third guide shaft is fixedly connected to the tooling bottom plate.

[0014] Preferably, the outer wall of the third guide shaft is sleeved with a second rectangular spring, wherein the upper end of the second rectangular spring is fixedly connected to the bottom of the load-bearing pad, and the lower end of the second rectangular spring is fixedly connected to the tooling bottom plate.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects: the utility model can accurately control the clamping force of the workpiece through the cooperation of the load-bearing pad, the first guide shaft and the compression spring. The elastic action of the compression spring makes the clamping force neither too large nor too small, effectively preventing damage or movement of the workpiece due to improper clamping force, thereby ensuring the accuracy and quality of assembly; through the multi-level support and positioning of the support plate, the first contoured positioning seat and the workpiece support column, the stability and accuracy of the workpiece during the assembly process are ensured, and the clamping and release of the workpiece can be completed through simple lifting actions, which greatly reduces the labor intensity of the operator; by arranging the first rectangular spring on the outer wall of the second guide shaft and simultaneously arranging the second rectangular spring on the outer wall of the third guide shaft, the stability and reliability of the device during use are further improved, which not only plays a buffering role, but also can maintain the stability of the device during operation, greatly improving production efficiency and product quality.

[0016] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 This is a reference schematic diagram of the use state of the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the first profiling positioning seat and the second profiling positioning seat connected to the workpiece positioning plate of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the connection between the double-lined linear bearing and the workpiece positioning plate of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the connection between the tooling bottom plate and the workpiece positioning plate of the utility model;

[0023] Figure 6 The utility model is a structural schematic diagram of the connection between the load-bearing cushion block and the workpiece positioning plate.

[0024] Wherein: 1. tooling base plate; 2. workpiece positioning plate; 3. rectangular through hole; 4. load-bearing pad; 5. load-bearing column; 6. first contoured positioning seat; 7. support plate; 8. double-lined linear bearing; 9. first guide shaft; 10. guide shaft support plate; 11. compression spring; 12. air valve pump workpiece; 13. second contoured positioning seat; 14. workpiece support column; 15. positioning groove; 16. positioning hole; 17. mounting groove; 18. positioning guide plate; 19. valve core positioning hole; 20. single-lined linear bearing; 21. second guide shaft; 22. first rectangular spring; 23. sliding hole; 24. third guide shaft; 25. second rectangular spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Please refer to Figures 1 to 6To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-stage clamping device for assembling an air valve pump, comprising a tooling base plate 1 and a workpiece positioning plate 2 arranged above the tooling base plate 1, wherein the tooling base plate 1 is movably connected to the workpiece positioning plate 2; a rectangular through hole 3 is opened on the workpiece positioning plate 2, wherein a load-bearing pad 4 is arranged in the rectangular through hole 3; the load-bearing pad 4 is movably connected to the tooling base plate 1, wherein a load-bearing column 5 is arranged at the lower end of the load-bearing pad 4, and the lower end of the load-bearing column 5 penetrates the tooling base plate 1 and extends downward; a first contoured positioning seat 6 is arranged at the upper end of the load-bearing pad 4, which A support plate 7 is provided above the first contoured positioning seat 6; double-lined linear bearings 8 are symmetrically installed on the left and right sides of the rectangular through hole 3, wherein each double-lined linear bearing 8 is provided with a first guide shaft 9 matched therewith; the upper end of the first guide shaft 9 is fixedly connected to the support plate 7, wherein the lower end of the first guide shaft 9 downwardly penetrates the tooling bottom plate 1 and is fixedly connected to a guide shaft support plate 10; a compression spring 11 is provided on the outer wall of the first guide shaft 9, wherein the upper end of the compression spring 11 is fixedly connected to the bottom of the double-lined linear bearing 8, and the lower end of the compression spring 11 is fixedly connected to the guide shaft support plate 10. The electric cylinder (not shown) is controlled to push the guide shaft support plate 10 upward, so that the guide shaft support plate 10 drives the first guide shaft 9 to push the support plate 7 to move upward, and at the same time, the compression spring 11 begins to be compressed and generates a reaction force, so that the first guide shaft 9 pushes the support plate 7 away from the first contoured positioning seat 6, so as to facilitate the placement of the air valve pump workpiece 12 to be assembled on the first contoured positioning seat 6, wherein the first contoured positioning seat 6 matches the shape of the air valve pump workpiece 12, ensuring the stability and precise positioning of the installation of the air valve pump workpiece 12; then the electric cylinder is controlled to retract downward The compression spring 11 sleeved on the outer wall of the first guide shaft 9 loses its upward squeezing force, and the compression spring 11 gradually returns to its natural state under the action of the elastic force, so that the compression spring 11 drives the first guide shaft 9 and the support plate 7 to move downward synchronously, and then the support plate 7 cooperates with the first contoured positioning seat 6 to clamp and fix the air valve pump workpiece 12. Due to the elasticity of the compression spring 11, the clamping force can be accurately controlled to avoid damage to the air valve pump workpiece 12. After the air valve pump workpiece 12 is stably clamped, subsequent assembly operations can be performed.

[0027] Please refer to Figures 1 to 3As an embodiment of the utility model, a second contoured positioning seat 13 is fixedly installed on the side of the workpiece positioning plate 2 away from the rectangular through hole 3, wherein the second contoured positioning seat 13 is arranged side by side with the first contoured positioning seat 6; a plurality of workpiece support columns 14 are respectively arranged on the front and rear sides of the first contoured positioning seat 6, wherein the workpiece support column 14 is arranged below the support plate 7; the lower end of the workpiece support column 14 is fixedly connected to the workpiece positioning plate 2, wherein a positioning groove 15 is provided at the top of the workpiece support column 14; a plurality of positioning holes 16 corresponding to the workpiece support columns 14 are provided on the support plate 7, wherein a positioning pin (not shown) is respectively provided in each positioning hole 16.

[0028] In the above-mentioned scheme, the shapes of the first profiling positioning seat 6 and the second profiling positioning seat 13 are designed according to the appearance of the air valve pump workpiece 12 to ensure that the air valve pump workpiece 12 can be accurately placed on the first profiling positioning seat 6 and the second profiling positioning seat 13 to achieve preliminary positioning and fixation; by arranging a plurality of workpiece support columns 14 on the front and rear sides of the first profiling positioning seat 6, wherein the workpiece support columns 14 are located directly below the support plate 7, additional support force is provided for the air valve pump workpiece 12 placed on the first profiling positioning seat 6 and the second profiling positioning seat 13, and a positioning groove 15 is provided at the top of each workpiece support column 14, these The positioning groove 15 corresponds to the positioning hole 16 provided on the support plate 7, forming a fine positioning structure. When the support plate 7 descends, the positioning hole 16 provided on the support plate 7 is precisely aligned with the positioning groove 15 at the top of the workpiece support column 14, and a positioning pin is provided in each positioning hole 16, so that the lower end of the positioning pin passes through the positioning hole 16 and is inserted into the corresponding positioning groove 15, thereby realizing the precise positioning of the air valve pump workpiece 12 in the horizontal direction, preventing the air valve pump workpiece 12 from moving during the assembly process, realizing efficient, precise positioning and stable support of the air valve pump workpiece 12, and providing a solid foundation for subsequent assembly operations.

[0029] Please refer to Figure 1 , Figure 2 As an embodiment of the utility model, a mounting groove 17 is opened in the middle of the support plate 7, wherein a positioning guide plate 18 is fixedly installed in the mounting groove 17; the positioning guide plate 18 is arranged above the first contoured positioning seat 6, wherein a plurality of valve core positioning holes 19 are opened on the positioning guide plate 18.

[0030] In the above-described scheme, the air valve pump workpiece 12 to be assembled is placed on the first contoured positioning seat 6 and the second contoured positioning seat 13. Under the action of the elastic force of the compression spring 11, the compression spring 11 drives the first guide shaft 9 and the support plate 7 to move downward synchronously. In this process, the positioning guide plate 18 will gradually approach the air valve pump workpiece 12 as the support plate 7 descends. When the support plate 7 is completely lowered into place, the valve core positioning hole 19 on the positioning guide plate 18 will be accurately aligned with the corresponding position of the valve core on the air valve pump workpiece 12. This design ensures that the valve core can be accurately installed in the predetermined position, realizes accurate positioning and rapid assembly of the valve core, and greatly improves production efficiency and product quality.

[0031] See also Figure 5 As an embodiment of the utility model, single-line linear bearings 20 are respectively provided at the four corners of the workpiece positioning plate 2, wherein the single-line linear bearing 20 is provided with a second guide shaft 21 matched therewith; the upper end of the second guide shaft 21 is slidably connected to the single-line linear bearing 20, wherein the lower end of the second guide shaft 21 is fixedly connected to the tooling base plate 1; the outer wall of the second guide shaft 21 is sleeved with a first rectangular spring 22, wherein the upper end of the first rectangular spring 22 is fixedly connected to the single-line linear bearing 20, and the lower end of the first rectangular spring 22 is fixedly connected to the tooling base plate 1.

[0032] In the above-described scheme, in the non-working state, the workpiece positioning plate 2 is in the initial position, and the single-lined linear bearings 20 at the four corners and the second guide shaft 21 are in a relatively static state. At this time, the first rectangular spring 22 is in a natural or slightly compressed state, providing a stable supporting force for the workpiece positioning plate 2; when the air valve pump workpiece 12 is placed on the first contoured positioning seat 6 and the second contoured positioning seat 13 and fixed, the riveting mechanism is then controlled to assemble the valve core. In the process of assembling the valve core on the air valve pump workpiece 12, the positioning guide plate 18 will be subjected to downward pressure and drive the support plate 7 to move downward, so that the workpiece positioning plate 2 moves downward synchronously with the descent of the support plate 7, because the workpiece positioning plate 2 and the support plate 7 are interconnected through the first contoured positioning seat 6 and the workpiece support column 14. As the workpiece positioning plate 2 descends, the single-lined linear bearings 20 at its four corners begin to slide downward along the second guide shaft 21, wherein the second guide shaft 21 acts as a guide element to ensure that the workpiece positioning plate 2 moves smoothly and accurately in the vertical direction; at the same time, the cooperation between the single-lined linear bearing 20 and the second guide shaft 21 also reduces the friction and resistance during movement; during the descent of the workpiece positioning plate 2, the first rectangular spring 22 begins to be compressed, and this compression provides a buffering effect for the movement of the workpiece positioning plate 2 and avoids potential damage to the workpiece due to sudden descent; after assembling a valve core, the external riveting mechanism rises and separates from the support plate 7. During this process, the first rectangular spring 22 gradually returns to its natural state, so that the first rectangular spring 22, under the action of elastic force, pushes the single-lined linear bearing 20 to drive the workpiece positioning plate 2 to slide upward along the second guide shaft 21 until it returns to the initial position, thereby achieving smooth lifting and lowering of the workpiece positioning plate 2 and stable clamping of the workpiece, improving the accuracy and efficiency of assembly, and ensuring the stability and safety of the assembly process.

[0033] See also Figure 6 As an embodiment of the utility model, sliding holes 23 are respectively opened at the four corners of the load-bearing pad 4, wherein a third guide shaft 24 is respectively arranged in each sliding hole 23; the upper end of the third guide shaft 24 is slidably connected with the load-bearing pad 4, wherein the lower end of the third guide shaft 24 is fixedly connected with the tooling base plate 1; the outer wall of the third guide shaft 24 is sleeved with a second rectangular spring 25, wherein the upper end of the second rectangular spring 25 is fixedly connected with the bottom of the load-bearing pad 4, and the lower end of the second rectangular spring 25 is fixedly connected with the tooling base plate 1.

[0034] In the above-described scheme, third guide shafts 24 are respectively arranged in the sliding holes 23 opened at the four corners of the load-bearing pad 4, wherein the third guide shafts 24 are slidably connected with the load-bearing pad 4, allowing the load-bearing pad 4 to move up and down within a certain range, and at the same time, the outer wall of each third guide shaft 24 is sleeved with a second rectangular spring 25, wherein the second rectangular spring 25 may be in a slightly compressed or natural state in the initial state, providing a certain elasticity and buffer for the movement of the load-bearing pad 4; when the air valve pump workpiece 12 is placed on the first contoured positioning seat 6 above the load-bearing pad 4, the gravity of the air valve pump workpiece 12 will pass through the first The contoured positioning seat 6 is transferred to the load-bearing pad 4. At this time, the load-bearing pad 4 begins to bear the weight of the air valve pump workpiece 12. As the external riveting mechanism applies pressure to the air valve pump workpiece 12, the support plate 7 begins to descend, thereby pushing the load-bearing pad 4 to move downward. In this process, the load-bearing pad 4 slides downward along the third guide shaft 24 and compresses the second rectangular spring 25 at the same time, wherein the compression of the second rectangular spring 25 provides a buffer and uniform pressure distribution for the clamping operation, thereby ensuring that the air valve pump workpiece 12 will not be subjected to excessive impact force during the process of clamping and transferring the valve core, thereby ensuring the stability and safety of the assembly process.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A multi-stage clamping device for assembling an air valve pump, comprising a tooling base plate (1) and a workpiece positioning plate (2) arranged above the tooling base plate (1), wherein the tooling base plate (1) and the workpiece positioning plate (2) are movably connected; characterized in that: The workpiece positioning plate (2) is provided with a rectangular through hole (3), wherein a load-bearing pad (4) is arranged in the rectangular through hole (3), and the load-bearing pad (4) is movably connected to the tooling base plate (1); a first contoured positioning seat (6) is arranged at the upper end of the load-bearing pad (4), wherein a support plate (7) is arranged above the first contoured positioning seat (6); double-lined linear bearings (8) are symmetrically installed on the left and right sides of the rectangular through hole (3), wherein each of the double-lined linear bearings (8) is provided with a first guide shaft (9) adapted thereto; the upper end of the first guide shaft (9) is fixedly connected to the support plate (7), wherein the lower end of the first guide shaft (9) downwardly penetrates the tooling base plate (1) and is fixedly connected to the guide shaft support plate (10); a compression spring (11) is sleeved on the outer wall of the first guide shaft (9), wherein the upper end of the compression spring (11) is fixedly connected to the bottom of the double-lined linear bearing (8), and the lower end of the compression spring (11) is fixedly connected to the guide shaft support plate (10).

2. A multi-stage clamping device for assembling an air valve pump according to claim 1, characterized in that: A second contour positioning seat (13) is fixedly mounted on the side of the workpiece positioning plate (2) away from the rectangular through hole (3), wherein the second contour positioning seat (13) and the first contour positioning seat (6) are arranged side by side.

3. A multi-stage clamping device for assembling an air valve pump according to claim 2, characterized in that: A plurality of workpiece support columns (14) are respectively provided on the front and rear sides of the first contour positioning seat (6), wherein the workpiece support columns (14) are arranged below the support plate (7); the lower ends of the workpiece support columns (14) are fixedly connected to the workpiece positioning plate (2), wherein the top ends of the workpiece support columns (14) are provided with positioning grooves (15).

4. A multi-stage clamping device for assembling an air valve pump according to claim 3, characterized in that: The support plate (7) is provided with a plurality of positioning holes (16) corresponding one-to-one to the workpiece support columns (14), wherein each positioning hole (16) is provided with a positioning pin.

5. A multi-stage clamping device for assembling an air valve pump according to claim 4, characterized in that: The support plate (7) is provided with a mounting groove (17) in the middle, wherein a positioning guide plate (18) is fixedly installed in the mounting groove (17), and a plurality of valve core positioning holes (19) are provided on the positioning guide plate (18).

6. A multi-stage clamping device for assembling an air valve pump according to claim 1, characterized in that: The workpiece positioning plate (2) is provided with a single-line linear bearing (20) at the four corners, wherein the single-line linear bearing (20) is provided with a second guide shaft (21) adapted thereto; the upper end of the second guide shaft (21) is slidably connected to the single-line linear bearing (20), wherein the lower end of the second guide shaft (21) is fixedly connected to the tooling base plate (1).

7. A multi-stage clamping device for assembling an air valve pump according to claim 6, characterized in that: The outer wall of the second guide shaft (21) is sleeved with a first rectangular spring (22), wherein the upper end of the first rectangular spring (22) is fixedly connected to the single-liner linear bearing (20), and the lower end of the first rectangular spring (22) is fixedly connected to the tooling base plate (1).

8. A multi-stage clamping device for assembling an air valve pump according to claim 1, characterized in that: The four corners of the load-bearing cushion block (4) are respectively provided with sliding holes (23), wherein each sliding hole (23) is respectively provided with a third guide shaft (24); the upper end of the third guide shaft (24) is slidably connected to the load-bearing cushion block (4), wherein the lower end of the third guide shaft (24) is fixedly connected to the tooling base plate (1).

9. A multi-stage clamping device for assembling an air valve pump according to claim 8, characterized in that: The outer wall of the third guide shaft (24) is sleeved with a second rectangular spring (25), wherein the upper end of the second rectangular spring (25) is fixedly connected to the bottom of the load-bearing pad (4), and the lower end of the second rectangular spring (25) is fixedly connected to the tooling bottom plate (1).

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