Manufacturing device of valve spring

Abstract

The invention relates to the technical field of valve spring polishing, in particular to a valve spring manufacturing device which comprises production equipment, the production equipment comprises a shell, a wire feeding component is arranged in the shell, and the wire feeding component is used for feeding raw materials into a forming shaft and a rotating roller. The forming shaft and the rotating roller are used for making raw materials into valve springs, a cutting knife is arranged in the shell and used for cutting the raw materials, a polishing assembly used for polishing the valve springs is arranged in the production equipment, and the polishing assembly comprises a control groove formed in the shell. And a driving motor is installed in the control groove and used for driving a grinding plate to rotate, and the grinding plate is arranged between the rotating rollers and used for grinding the bottom of the valve spring. The problems of low efficiency and unstable quality caused by separation of production and polishing procedures and surface damage caused by frequent transfer of semi-finished products in the prior art are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve spring grinding, in particular to a valve spring manufacturing device. BACKGROUND

[0002] Valve spring is a key component of the valve train system of internal combustion engine, which is usually made of high-strength spring steel and installed between the cylinder head and the valve stem in a spiral structure. Its main function is to ensure the timely closure of the valve by elastic deformation, while suppressing valve vibration to ensure the stable operation of the engine valve train. The manufacturing of valve spring needs to meet the requirements of high precision, high fatigue life and surface finish, and its performance directly affects the reliability and efficiency of the engine.

[0003] Currently, the manufacturing of valve spring usually adopts a split processing flow: first, the wire feeding mechanism is used to deliver the metal wire to the forming station, and then the wire is wound into a spiral spring by the cooperation of the forming shaft and the rotating roller, and then the cutting knife is used to cut off to form a semi-finished product. After the forming is completed, the valve spring needs to be transferred to an independent grinding equipment to perform deburring, chamfering and other treatments on the end face by means of a grinding wheel or a polishing tool to meet the assembly precision requirements. Although the existing technology can realize the basic functions, it still relies on multiple equipment to work together, and manual intervention or special conveying mechanism is needed to connect each link, resulting in decentralized production process.

[0004] The split manufacturing method has significant efficiency bottleneck and quality risk. First, the separation of forming and grinding processes leads to longer production cycle, frequent transfer of semi-finished products and increased time cost. Second, the transfer process is prone to surface scratches and end face deformation due to collision or positioning deviation, which reduces product consistency. In addition, the replacement and debugging of independent grinding equipment further increase the process complexity, making it difficult to meet the high-cycle and integrated production requirements. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the present application provides a valve spring manufacturing device, which can effectively solve the problems of low efficiency and unstable quality caused by the separation of production and grinding processes, and surface damage caused by frequent transfer of semi-finished products.

[0006] To achieve the above purpose, the present application realizes the following technical scheme: The present application provides a valve spring manufacturing device, which includes a production equipment, the production equipment includes a shell, the shell is provided with a wire feeding member inside, the wire feeding member is used to feed raw materials to the forming shaft and the rotating roller, the forming shaft and the rotating roller are used to make the raw materials into valve springs, and the shell is provided with a cutting knife inside, the cutting knife is used to cut the raw materials. The production equipment is equipped with a grinding assembly for grinding valve springs. The grinding assembly includes a control slot formed in the housing, and a drive motor is installed in the control slot. The drive motor is used to drive the grinding plate to rotate. The grinding plate is disposed between the rotating rollers and is used to grind the bottom of the valve spring.

[0007] Preferably, the output end of the drive motor is fixedly connected to an inner shaft, the inner shaft is inserted into the outer cylinder, a grinding plate is fixedly connected to one side of the outer cylinder, the forming shaft is fixedly connected to one side of the grinding plate, a track groove is formed on the inner wall of the outer cylinder, a track slider is slidably connected in the track groove, and the track slider is fixedly connected to the outer wall of the inner shaft.

[0008] Preferably, a first spring is fixedly connected to the bottom of the outer cylinder, and the other end of the first spring is fixedly connected to one side of the rotating ring. The rotating ring is rotatably connected in the rotating groove, which is formed on the inner wall of the control groove. The rotating ring is fixedly connected to the side wall of the inner shaft.

[0009] Preferably, a clamping assembly is provided inside the housing, the clamping assembly includes a clamping groove, the clamping groove is formed inside the housing, a telescopic rod is fixedly connected inside the clamping groove, a clamping slider is provided at the output end of the telescopic rod, the clamping slider is slidably connected inside the clamping groove, and a rotating roller is provided on one side of the clamping slider.

[0010] Preferably, a sliding ring is fixedly connected to the side wall of the outer cylinder, and a fixed ring is fixedly connected to the inner wall of the control groove. A hydraulic space is formed between the fixed ring and the sliding ring. The hydraulic space is connected to a first channel, and the other end of the first channel is connected to a telescopic rod. The first channel is opened inside the housing. Hydraulic oil is provided between the telescopic rod, the first channel, and the hydraulic space.

[0011] Preferably, a locking component is provided on one side of the clamping slider. The locking component includes a T-bar, one end of which is fixedly connected to one side of the clamping slider, and the other end of which is rotatably connected to a T-groove, which is formed inside the rotating roller.

[0012] Preferably, a locking groove is provided inside the T-shaped rod, and a locking tooth is slidably connected inside the locking groove. One end of the locking tooth is inserted into the tooth groove, and the tooth groove is provided inside the rotating roller.

[0013] Preferably, the clamping slider has a second channel and an oil groove, and a piston plate is slidably connected in the oil groove.

[0014] Preferably, the oil tank is connected to the locking groove through the second channel, and hydraulic oil is filled between the locking groove, the second channel, and the oil tank.

[0015] Preferably, multiple sets of the rotating roller, the clamping assembly, and the locking assembly are arranged circumferentially around the forming shaft.

[0016] The technical solution provided by this invention has the following advantages compared with the known prior art: The integrated molding and polishing design solves the problem of process separation in traditional split-process manufacturing. After the valve spring is formed by winding it around the molding shaft and rotating rollers and then cut by the cutting blade, it can be directly polished at the bottom by the polishing component inside the housing without needing to be transferred to separate equipment. This significantly shortens the production cycle and reduces the time and cost of transferring semi-finished products. At the same time, it avoids defects such as scratches and end face deformation on the valve spring surface caused by collisions and positioning deviations during the transfer process, effectively improving the dimensional accuracy and surface finish consistency of the valve spring products, making them more suitable for high-cycle mass production.

[0017] Simultaneously, a hydraulic linkage structure for grinding and clamping ensures stable control of the processing. When the outer cylinder slides, the hydraulic space and channel one drive the telescopic rod, causing multiple sets of rotating rollers to converge towards the center, uniformly clamping the valve springs from multiple directions. This prevents the valve springs from shifting or flying out during grinding, ensuring grinding accuracy. The smoothness and buffering capacity of the hydraulic transmission prevent damage to the valve springs from excessive clamping and ensure proper forming from excessive looseness, while also adapting to the processing requirements of valve springs of different specifications. Furthermore, the locking assembly, through hydraulically driven locking racks, locks the rotating rollers, preventing accidental rotation during grinding and further enhancing processing stability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the rotating roller and locking assembly of the present invention; Figure 5 For the present invention Figure 3Enlarged structural diagram at point B; Figure 6 For the present invention Figure 3 Enlarged structural diagram at point C; Figure 7 This is a schematic diagram of the disassembled structure of the locking component of the present invention; Figure 8 This is a schematic diagram of the split cross-sectional structure of the locking component of the present invention.

[0020] Figure label: 1. Production equipment; 11. Housing; 12. Wire feeding component; 13. Forming shaft; 14. Rotating roller; 15. Cutting blade; 2. Grinding assembly; 21. Control groove; 22. Drive motor; 23. Inner shaft; 24. Outer cylinder; 25. Grinding plate; 26. Track groove; 27. Track slider; 28. Rotating groove; 29. ​​Rotating ring; 210. No. 1 spring; 3. Clamping assembly; 31. Clamping slide; 32. Clamping slider; 33. Telescopic rod; 34. No. 1 channel; 35. Fixed ring; 36. Sliding ring; 37. Hydraulic space; 4. Locking assembly; 41. T-groove; 42. Tooth groove; 43. T-bar; 44. Locking groove; 45. Locking toothed bar; 46. No. 2 channel; 47. Oil groove; 48. Piston plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Example: Refer to Figures 1 to 8 A valve spring manufacturing apparatus includes a production device 1, which includes a housing 11. A wire feeding component 12 is provided inside the housing 11. The wire feeding component 12 is used to feed raw materials into a forming shaft 13 and a rotating roller 14. The forming shaft 13 and the rotating roller 14 are used to form the raw materials into valve springs. A cutting blade 15 is provided inside the housing 11. The cutting blade 15 is used to cut the raw materials.

[0024] In use, the metal wire is fed to the forming shaft 13 and the rotating roller 14 by the wire feeding component 12. The valve spring is formed by the cooperation of the forming shaft 13 and the rotatable rotating roller 14 (specifically, the forming method and related structure of the valve spring spiral shape are prior art to those skilled in the art, so this solution does not describe the spiral forming scheme in detail). After the forming is completed, the metal wire is cut by the cutting blade 15 set above the forming shaft 13 to form a semi-finished valve spring. At the same time as cutting, the valve spring is clamped by the clamping component 3, and the bottom of the valve spring is polished by the polishing component 2 to complete the preparation of the valve spring.

[0025] The production equipment 1 is equipped with a grinding assembly 2 for grinding valve springs. The grinding assembly 2 includes a control groove 21 opened in the housing 11. A drive motor 22 is installed in the control groove 21. The drive motor 22 is used to drive the grinding plate 25 to rotate. The grinding plate 25 is arranged between the rotating rollers 14. The grinding plate 25 is used to grind the bottom of the valve spring.

[0026] An inner shaft 23 is fixedly connected to the output end of the drive motor 22. The inner shaft 23 is inserted into the outer cylinder 24. A grinding plate 25 is fixedly connected to one side of the outer cylinder 24. A forming shaft 13 is fixedly connected to one side of the grinding plate 25. A track groove 26 is opened on the inner wall of the outer cylinder 24. A track slider 27 is slidably connected in the track groove 26. The track slider 27 is fixedly connected to the outer wall of the inner shaft 23.

[0027] A first spring 210 is fixedly connected to the bottom of the outer cylinder 24. The other end of the first spring 210 is fixedly connected to one side of the rotating ring 29. The rotating ring 29 is rotatably connected in the rotating groove 28. The rotating groove 28 is opened on the inner wall of the control groove 21. The rotating ring 29 is fixedly connected to the side wall of the inner shaft 23.

[0028] Specifically, after the valve spring is formed, one end of the valve spring is polished by the polishing assembly 2. Driven by the drive motor 22, the inner shaft 23 fixedly connected to the output end of the drive motor 22 starts to rotate. At this time, since the inner shaft 23 and the outer cylinder 24 are provided with a track groove 26 and a track slider 27, the outer cylinder 24 slides outward as the inner shaft 23 rotates until the track slider 27 slides to the end of the track groove 26. At this time, the outer cylinder 24 rotates with the rotation of the inner shaft 23. At the same time, the polishing plate 25 fixedly connected to one side of the outer cylinder 24 rotates synchronously. During this process, the outer cylinder 24 slides outward, so that the polishing plate 25 abuts against the bottom of the valve spring. The rotation of the polishing plate 25 polishes the end of the valve spring.

[0029] This design achieves integrated "forming-grinding," effectively solving the pain points of traditional split-processing. On the one hand, valve springs can be ground immediately after forming without transfer, significantly shortening the production cycle and reducing defects such as surface scratches and end face deformation caused by collisions and positioning deviations during the transfer of semi-finished products, thereby improving product consistency.

[0030] The separation and contact between the grinding plate 25 and the valve spring prevents the position of the grinding plate 25 from affecting the manufacturing of the valve spring during the manufacturing process. At the same time, this sliding design can effectively ensure the mutual resistance between the grinding plate 25 and the valve spring, thereby ensuring the grinding effect.

[0031] The design of the rotating ring 29 and the first spring 210 ensures that after grinding, the drive motor 22 stops running and the inner shaft 23 loses power. At this time, the outer cylinder 24 is pulled back to its original position by the reset function of the first spring 210 to ensure the next grinding production. At the same time, the entire component is integrated into the housing 11, which is compact, reduces the space occupied by the equipment, reduces the process complexity of multi-equipment collaboration, and is more suitable for the high-cycle valve spring mass production needs.

[0032] A clamping assembly 3 is provided inside the housing 11. The clamping assembly 3 includes a clamping groove 31. The clamping groove 31 is opened inside the housing 11. A telescopic rod 33 is fixedly connected inside the clamping groove 31. A clamping slider 32 is provided at the output end of the telescopic rod 33. The clamping slider 32 is slidably connected inside the clamping groove 31. A rotating roller 14 is provided on one side of the clamping slider 32.

[0033] A sliding ring 36 is fixedly connected to the side wall of the outer cylinder 24, and a fixed ring 35 is fixedly connected to the inner wall of the control groove 21. A hydraulic space 37 is formed between the fixed ring 35 and the sliding ring 36. The hydraulic space 37 is connected to a first channel 34. The other end of the first channel 34 is connected to the telescopic rod 33. The first channel 34 is opened inside the housing 11. Hydraulic oil is provided between the telescopic rod 33, the first channel 34 and the hydraulic space 37.

[0034] Specifically, a sealing structure is provided in the fixed ring 35, the sliding ring 36, and the hydraulic space 37 to ensure the stability of the hydraulic process. In order to ensure the stability of the grinding process, the stability of the valve spring needs to be ensured during the grinding process to prevent the valve spring from flying out during the grinding process. As the outer cylinder 24 slides, the sliding ring 36 fixedly connected to the side wall of the outer cylinder 24 slides into the fixed ring 35 fixedly connected to the inner wall of the control groove 21, thereby squeezing the space in the hydraulic space 37. This allows the hydraulic oil filled in the hydraulic space 37 to be transported to the telescopic rod 33 through the first channel 34, thereby driving the clamping slider 32 connected to the top of the telescopic rod 33 to slide, thereby driving the rotating roller 14, which holds the valve spring, to slide inward. The rotating roller 14 has multiple sets around its circumference, so that the valve spring is subjected to extrusion forces in multiple directions, thereby achieving the clamping effect.

[0035] This design achieves "grinding-clamping" linkage control and high-precision adjustment, significantly improving production stability and adaptability. Utilizing the characteristics of hydraulic transmission, the hydraulic oil transmits pressure smoothly and responds quickly, converting the displacement changes of the outer cylinder 24 into precise adjustments of the rotating roller 14. This ensures uniform clamping force of the rotating roller 14 on the valve spring, preventing valve spring misalignment and insufficient forming accuracy due to loose clamping, or damage to the valve spring due to excessive clamping. Furthermore, the clamping assembly 3 and the grinding assembly 2 are hydraulically linked, eliminating the need for additional independent drive components, simplifying the overall structure of the device and reducing the complexity of multi-component control. The design of the clamping slider 32 sliding along the clamping groove 31 ensures the linear accuracy of the rotating roller 14 during adjustment, further improving the fit between the forming shaft 13 and the rotating roller 14, guaranteeing the consistency of the valve spring helical structure, and reducing the production defect rate.

[0036] A locking component 4 is provided on one side of the clamping slider 32. The locking component 4 includes a T-bar 43. One end of the T-bar 43 is fixedly connected to one side of the clamping slider 32, and the other end of the T-bar 43 is rotatably connected to a T-groove 41. The T-groove 41 is opened in the rotating roller 14.

[0037] A locking groove 44 is provided inside the T-shaped rod 43, and a locking tooth 45 is slidably connected inside the locking groove 44. One end of the locking tooth 45 is inserted into the tooth groove 42, which is located inside the rotating roller 14.

[0038] The clamping slider 32 has a second channel 46 and an oil groove 47, and a piston plate 48 is slidably connected in the oil groove 47.

[0039] The oil tank 47 is connected to the locking groove 44 through the second channel 46, and hydraulic oil is filled between the locking groove 44, the second channel 46 and the oil tank 47.

[0040] Multiple sets of rotating rollers 14, clamping components 3 and locking components 4 are arranged around the forming shaft 13.

[0041] Specifically, the locking component 4 is designed to lock the rotating roller 14, preventing it from being driven to rotate during the grinding process and reducing the grinding effect. When the telescopic rod 33 drives the clamping slider 32 to slide within the clamping groove 31, it first drives the clamping slider 32 to slide upwards until its limit. At this time, as the telescopic rod 33 continues to drive, the piston plate 48 continues to slide inwards along the oil groove 47. As the piston plate 48 slides, it squeezes the hydraulic oil in the oil groove 47, causing the locking tooth 45 in the locking groove 44 to slide outwards synchronously, driving one end of the locking tooth 45 to insert into the tooth groove 42 of the rotating roller 14. At the same time, due to the insertion of the tooth block at the end of the locking tooth 45 into the tooth groove 42, and the rectangular design of the locking groove 44 and the locking tooth 45, a simple lock is achieved between the rotating roller 14 and the locking tooth 45, preventing the rotating roller 14 from being driven to rotate during the grinding process and reducing the grinding effect.

[0042] This design effectively ensures the forming accuracy of valve springs and the ease of equipment operation. From a reliability perspective, the mechanical locking effect is achieved through the engagement of the locking rack 45 and the tooth groove 42, stabilizing and fixing the rotating roller 14 and preventing displacement or slippage due to vibration or force changes during grinding. This ensures the fitting accuracy between the rotating roller 14 and the forming shaft 13, thereby guaranteeing the consistency of the valve spring helical structure and reducing defects such as dimensional deviations. In terms of flexibility, the hydraulically driven unlocking method offers rapid response, eliminating the need for complex manual operation and adapting to automated production requirements. Simultaneously, the uniform pressure transmission of the hydraulic oil prevents impact damage to components during unlocking, extending component lifespan. Furthermore, the locking component 4 is integrated between the clamping slider 32 and the rotating roller 14, featuring a compact structure that requires no additional equipment space. It works synergistically with the clamping component 3, further enhancing the overall integration and operational stability of the device.

[0043] The working principle of this invention is as follows: First, the metal wire is fed to the forming shaft 13 and rotating roller 14 via the wire feeding component 12. The forming shaft 13 and rotating roller 14 work together to wind the wire into a spiral-shaped valve spring semi-finished product (the specific forming method and related structure of the spiral shape of the valve spring are prior art to those skilled in the art, therefore this solution does not describe the spiral forming method in detail). Then, the cutting blade 15 cuts the wire. During grinding, the drive motor 22 starts and drives the inner shaft 23 to rotate. The inner shaft 23, through the cooperation of the track slider 27 and the track groove 26 on the inner wall of the outer cylinder 24, first pushes the outer cylinder 24 to slide outward until the track slider 27 reaches the end of the track groove 26. The outer cylinder 24 rotates synchronously with the inner shaft 23, thereby driving the grinding plate 25 on one side of the outer cylinder 24 to rotate. The sliding of the outer cylinder 24 causes the grinding plate 25 to contact the bottom of the valve spring, achieving grinding of the bottom of the valve spring. After grinding, the first spring 210 pulls the outer cylinder 24 back to its original position via the rotating ring 29, preparing for the next processing.

[0044] During the grinding process, the sliding of the outer cylinder 24 causes the sliding ring 36 on its side wall to move towards the fixed ring 35 on the inner wall of the control groove 21, squeezing the hydraulic oil in the hydraulic space 37 between them. The hydraulic oil is delivered to the telescopic rod 33 through the first channel 34, pushing the clamping slider 32 at the output end of the telescopic rod 33 to slide along the clamping groove 31. Since the rotating roller 14 and the clamping assembly 3 are arranged in multiple sets around the forming shaft 13, the multiple sets of clamping sliders 32 synchronously drive the rotating roller 14 to move closer to the center, applying extrusion force to the valve spring from multiple directions, achieving stable clamping of the valve spring, preventing the valve spring from shifting or flying out during grinding, and ensuring grinding accuracy.

[0045] During the sliding of the clamping slider 32, the telescopic rod 33 first pushes the clamping slider 32 to its limit position. During this process, as the clamping slider 32 slides, the rotating roller 14 slides synchronously. Due to the circumferential arrangement of the rotating roller 14, the valve springs positioned between multiple sets of rotating rollers 14 are clamped by the sliding rotating rollers 14. Subsequently, the telescopic rod 33 continues to drive the piston plate 48 to slide along the oil groove 47. The hydraulic oil in the oil groove 47 enters the locking groove 44 through the second channel 46, pushing the locking toothed rod 45 to slide outwards, so that one end of it inserts into the toothed groove 42 of the rotating roller 14. Through the meshing of the locking toothed rod 45 with the toothed groove 42, combined with the rectangular structure of the locking groove 44 and the locking toothed rod 45, the rotating roller 14 is locked, preventing it from rotating with the valve springs or the grinding plate 25 during grinding, further ensuring the stability of the grinding process and guaranteeing the grinding effect.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve spring manufacturing apparatus, characterized in that, The equipment includes a production device (1), which includes a housing (11). A wire feeding component (12) is provided inside the housing (11). The wire feeding component (12) is used to feed raw materials into a forming shaft (13) and a rotating roller (14). The forming shaft (13) and the rotating roller (14) are used to make valve springs from the raw materials. A cutting blade (15) is provided inside the housing (11). The cutting blade (15) is used to cut the raw materials. The production equipment (1) is provided with a grinding assembly (2) for grinding valve springs. The grinding assembly (2) includes a control groove (21) opened in the housing (11). A drive motor (22) is installed in the control groove (21). The drive motor (22) is used to drive the grinding plate (25) to rotate. The grinding plate (25) is arranged between the rotating rollers (14). The grinding plate (25) is used to grind the bottom of the valve spring.

2. The valve spring manufacturing apparatus according to claim 1, characterized in that, The output end of the drive motor (22) is fixedly connected to an inner shaft (23), which is inserted into the outer cylinder (24). A grinding plate (25) is fixedly connected to one side of the outer cylinder (24), and a forming shaft (13) is fixedly connected to one side of the grinding plate (25). A track groove (26) is provided on the inner wall of the outer cylinder (24), and a track slider (27) is slidably connected in the track groove (26). The track slider (27) is fixedly connected to the outer wall of the inner shaft (23).

3. The valve spring manufacturing apparatus according to claim 2, characterized in that, A first spring (210) is fixedly connected to the bottom of the outer cylinder (24). The other end of the first spring (210) is fixedly connected to one side of the rotating ring (29). The rotating ring (29) is rotatably connected in the rotating groove (28). The rotating groove (28) is opened on the inner wall of the control groove (21). The rotating ring (29) is fixedly connected to the side wall of the inner shaft (23).

4. The valve spring manufacturing apparatus according to claim 2, characterized in that, The housing (11) is provided with a clamping assembly (3), which includes a clamping groove (31). The clamping groove (31) is opened in the housing (11). A telescopic rod (33) is fixedly connected in the clamping groove (31). A clamping slider (32) is provided at the output end of the telescopic rod (33). The clamping slider (32) is slidably connected in the clamping groove (31). A rotating roller (14) is provided on one side of the clamping slider (32).

5. The valve spring manufacturing apparatus according to claim 4, characterized in that, A sliding ring (36) is fixedly connected to the side wall of the outer cylinder (24), and a fixed ring (35) is fixedly connected to the inner wall of the control groove (21). A hydraulic space (37) is formed between the fixed ring (35) and the sliding ring (36). The hydraulic space (37) is connected to a first channel (34). The other end of the first channel (34) is connected to a telescopic rod (33). The first channel (34) is opened in the housing (11). Hydraulic oil is provided between the telescopic rod (33), the first channel (34) and the hydraulic space (37).

6. The valve spring manufacturing apparatus according to claim 4, characterized in that, A locking assembly (4) is provided on one side of the clamping slider (32). The locking assembly (4) includes a T-bar (43). One end of the T-bar (43) is fixedly connected to one side of the clamping slider (32), and the other end of the T-bar (43) is rotatably connected in a T-groove (41). The T-groove (41) is opened in the rotating roller (14).

7. The valve spring manufacturing apparatus according to claim 6, characterized in that, The T-shaped rod (43) has a locking groove (44) inside, and a locking tooth (45) is slidably connected in the locking groove (44). One end of the locking tooth (45) is inserted into the tooth groove (42), and the tooth groove (42) is opened in the rotating roller (14).

8. The valve spring manufacturing apparatus according to claim 7, characterized in that, The clamping slider (32) has a second channel (46) and an oil groove (47) inside, and a piston plate (48) is slidably connected inside the oil groove (47).

9. The valve spring manufacturing apparatus according to claim 8, characterized in that, The oil tank (47) is connected to the locking groove (44) through the second channel (46), and hydraulic oil is filled between the locking groove (44), the second channel (46) and the oil tank (47).

10. The valve spring manufacturing apparatus according to claim 6, characterized in that, The rotating roller (14), the clamping assembly (3) and the locking assembly (4) are arranged in multiple sets around the forming shaft (13).

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