Spring correcting device

Through the combination of hydraulic adjustment and electromagnetic heating modules, the problem of difficult spring maintenance is solved, the efficient recovery of spring performance and cost reduction are achieved, and the efficiency and reliability of industrial production are improved.

CN223325386UActive Publication Date: 2025-09-12HUADIAN LAIZHOU POWER GENERATION
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Patent Information

Application Number
CN202422725485.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-08
Publication Date
2025-09-12
Estimated Expiration
2034-11-08

AI Technical Summary

Technical Problem

In the prior art, spring maintenance is difficult, time-consuming, and expensive, and the disassembly and transportation processes are complicated, affecting the normal operation of the equipment and production efficiency.

Method used

A combination of a hydraulic adjustment module and an electromagnetic heating module is used. The hydraulic adjustment module fixes the two ends of the spring and the electromagnetic heating module softens it, thereby achieving precise length and shape adjustment.

Benefits of technology

It achieves efficient recovery of spring performance, shortens maintenance time, reduces maintenance costs, and improves the accuracy and convenience of the correction process.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to the technical field of spring maintenance, in particular to a spring correcting device which comprises a hydraulic adjusting module and an electromagnetic heating module. The hydraulic adjusting module is used for fixing the two ends of the spring and adjusting the length of the spring according to needs. The electromagnetic heating module is used for heating the spring, so that the spring is softened and then shaped; the spring is fixed through the hydraulic adjusting module and then located on the side portion of the electromagnetic heating module. According to the utility model, the performance of the spring in industrial production can be efficiently and accurately recovered, and the spring is effectively prevented from being scrapped due to faults; by directly correcting the spring on site, the maintenance time is greatly shortened, and the maintenance cost is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of spring repair, in particular to a spring correction device. Background Art

[0002] In industrial production, springs are a key mechanical component with a wide range of applications. However, these springs are typically large in size and made of expensive materials. They are also relatively prone to wear and tear. Once a spring fails or its performance degrades, it needs to be promptly repaired or replaced. However, the current repair process has many inconveniences: first, due to the large size and complex installation location of the spring, it is usually necessary to disassemble it from the equipment; second, the disassembled spring often needs to be sent back to the original manufacturer for emergency repair or replacement. This process not only involves complex logistics and transportation, but can also lead to long periods of downtime, seriously affecting the normal operation and production efficiency of the equipment; finally, due to the expensive spring materials and complex repair process, the entire repair or replacement process is often accompanied by high costs. In summary, the existing technology for dealing with spring repair issues has objective disadvantages such as difficult repair, long time, and high cost. A more efficient and economical solution is urgently needed. Utility Model Content

[0003] The purpose of the present utility model is to provide a spring correction device in order to solve at least one of the above technical problems.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0005] A spring correction device comprises: a hydraulic adjustment module and an electromagnetic heating module;

[0006] The hydraulic adjustment module is used to fix the two ends of the spring and adjust the length of the spring as needed;

[0007] The electromagnetic heating module is used to heat the spring to soften the spring and then set the spring into shape; the spring is fixed by the hydraulic adjustment module and is located on the side of the electromagnetic heating module.

[0008] Furthermore, the hydraulic adjustment module includes a hydraulic pump, an oil tank, and a length adjustment mechanism that are interconnected;

[0009] The length adjustment mechanism is provided with an upper arm at the top and a lower arm at the bottom; one end of the spring is fixed to the upper arm and the other end is fixed to the lower arm; the distance between the upper arm and the lower arm is adjusted by the hydraulic pump and the oil tank.

[0010] Furthermore, a piston is provided inside the length adjustment mechanism, and the piston divides the interior of the length adjustment mechanism into an upper chamber and a lower chamber; the size change of the upper chamber and the lower chamber changes the position of the piston in the length adjustment mechanism; and the top of the piston is fixedly connected to the upper arm.

[0011] Furthermore, the bottom of the upper arm is connected to the piston by welding.

[0012] Furthermore, the hydraulic adjustment module further includes six valves;

[0013] One end of the hydraulic pump is connected to the oil tank, and the other end is connected to the first valve and the second valve respectively; the end of the first valve away from the second valve is connected to the upper chamber via a third valve; the end of the second valve away from the first valve is connected to the lower chamber via a fourth valve; one end of the fifth valve is connected to the oil tank, and the other end is connected between the first valve and the third valve; one end of the sixth valve is connected to the oil tank, and the other end is connected between the second valve and the fourth valve;

[0014] The first valve, the second valve, the fifth valve, and the sixth valve are one-way valves, and the third valve and the fourth valve are two-way valves; the oil in the oil tank can enter the interior of the length adjustment mechanism through the first valve, the second valve, the third valve, and the fourth valve, and the oil inside the length adjustment mechanism can enter the oil tank through the third valve, the fourth valve, the fifth valve, and the sixth valve.

[0015] Furthermore, a scale is provided on the upper arm for displaying the distance between the upper arm and the lower arm.

[0016] Furthermore, the spring is connected to the upper arm or the lower arm through a locking cat claw.

[0017] Furthermore, the electromagnetic heating module includes an electromagnetic coil;

[0018] The electromagnetic coil is arranged between the upper arm and the lower arm;

[0019] An insulating layer is provided outside the electromagnetic coil, and the insulating layer is used to protect the electromagnetic coil and prevent current leakage.

[0020] Furthermore, a spring-loaded safety valve is provided at one end of the hydraulic pump facing away from the oil tank.

[0021] The beneficial effects of the present invention are:

[0022] The spring correction device of the utility model provides strong support for the recovery of spring performance in industrial production with its high efficiency and precision, and significantly reduces the scrapping of springs due to faults; the design of the device is ingenious, easy to manufacture, and has strong practicality; its portability allows the user to directly bring the device to the site for spring correction during equipment maintenance, effectively shortening the maintenance time and reducing maintenance costs.

[0023] The scale provided on the utility model provides an accurate size reference for the spring correction work, ensuring the accuracy and reliability of the correction process.

[0024] The utility model not only solves many problems in the prior art, but also provides a new solution for spring maintenance in industrial production, playing an important role in improving spring utilization efficiency and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a spring correction device according to one embodiment of the present utility model.

[0026] In the figure: 10. Spring, 20. Electromagnetic heating module, 30. Hydraulic adjustment module, 1. First valve, 2. Second valve, 3. Third valve, 4. Fourth valve, 5. Fifth valve, 6. Sixth valve, 7. Hydraulic pump, 8. Piston, 9. Fuel tank, 11. Locking cat claw, 12. Length adjustment mechanism, 121. Upper arm, 122. Lower arm, 123. Upper chamber, 124. Lower chamber, 13. Safety valve. DETAILED DESCRIPTION

[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] Figure 1 This is a schematic diagram of the structure of a spring correction device according to one embodiment of the present invention. Figure 1 As shown, according to one embodiment of the present invention, a spring correction device includes: a hydraulic adjustment module 30 and an electromagnetic heating module 20;

[0030] The hydraulic adjustment module 30 is used to fix the two ends of the spring 10 and adjust the length of the spring 10 as needed;

[0031] The electromagnetic heating module 20 is used to heat the spring 10 so that the spring 10 is softened and then shaped; the spring 10 is fixed by the hydraulic adjustment module 30 and is located on the side of the electromagnetic heating module 20.

[0032] In this embodiment, the spring correction device comprises two main modules: a hydraulic adjustment module 30 and an electromagnetic heating module 20. The hydraulic adjustment module 30 secures the ends of the spring 10 and adjusts its length as needed. Using a hydraulic drive mechanism, the hydraulic adjustment module 30 precisely controls the extension or compression of the spring 10 to achieve the desired length. The electromagnetic heating module 20 heats the spring 10. Once the spring 10 is secured in place by the hydraulic adjustment module 30, the electromagnetic heating module 20 applies heat to soften it, facilitating shape adjustment and finalization. This heating process utilizes electromagnetic induction heating technology, rapidly and uniformly heating the spring 10 through changes in the electromagnetic field. The synergistic effect of these two modules enables the spring correction device to precisely adjust the length and finalize the shape of the spring 10. Once secured in the hydraulic adjustment module 30, the spring 10 is positioned to the side of the electromagnetic heating module 20. This arrangement allows the spring 10 to remain in place during heating, ensuring accurate and efficient heating and adjustment.

[0033] The utility model can efficiently and accurately restore the performance of springs in industrial production, effectively avoiding the scrapping of springs due to failures. The utility model can directly perform spring correction on site, thereby significantly shortening maintenance time and reducing maintenance costs.

[0034] According to one embodiment of the present invention, the hydraulic adjustment module 30 includes a hydraulic pump 7, a fuel tank 9, and a length adjustment mechanism 12 that are interconnected;

[0035] The length adjustment mechanism 12 is provided with an upper arm 121 at the top and a lower arm 122 at the bottom; one end of the spring 10 is fixed to the upper arm 121 and the other end is fixed to the lower arm 122; the distance between the upper arm 121 and the lower arm 122 is adjusted by the hydraulic pump 7 and the oil tank 9.

[0036] In this embodiment, the hydraulic adjustment module 30 includes a hydraulic pump 7, an oil tank 9, and a length adjustment mechanism 12, which are interconnected and work together to adjust and fix the length of the spring 10. The hydraulic pump 7 is responsible for providing pressurized oil, which is the power source of the entire hydraulic system. It converts mechanical energy into fluid pressure energy and provides the required pressure to the system. The oil tank 9 serves as a container for storing pressurized oil and also serves to dissipate heat and precipitate impurities, ensuring the cleanliness of the oil and the normal operation of the system. The length adjustment mechanism 12 is a key component for adjusting the length of the spring 10. It consists of an upper arm 121 and a lower arm 122. One end of the spring 10 is fixed to the upper arm 121, and the other end is fixed to the lower arm 122. Through the cooperation of the hydraulic pump 7 and the oil tank 9, the distance between the upper arm 121 and the lower arm 122 can be adjusted, thereby precisely adjusting the length of the spring 10. This adjustment mechanism allows the spring 10 to be fixed to the desired length after being heated and softened to meet different application requirements.

[0037] The utility model realizes the fixation and length adjustment of the two ends of the spring through the mutual cooperation of the hydraulic pump, oil tank and length adjustment mechanism in the hydraulic adjustment module, provides precise control for the subsequent heating and shaping of the electromagnetic heating module, makes the spring correction process more efficient and accurate, and also ensures the safety and reliability of the operation.

[0038] According to one embodiment of the present utility model, a piston 8 is provided inside the length adjustment mechanism 12, and the piston 8 divides the interior of the length adjustment mechanism 12 into an upper chamber 123 and a lower chamber 124; the size change of the upper chamber 123 and the lower chamber 124 changes the position of the piston 8 in the length adjustment mechanism 12; the top of the piston 8 is fixedly connected to the upper arm 121.

[0039] Preferably, the bottom of the upper arm 121 is connected to the piston 8 by welding.

[0040] Preferably, the hydraulic adjustment module 30 further includes six valves;

[0041] One end of the hydraulic pump 7 is connected to the oil tank 9, and the other end is connected to the first valve 1 and the second valve 2 respectively; the end of the first valve 1 away from the second valve 2 is connected to the upper chamber 123 through the third valve 3; the end of the second valve 2 away from the first valve 1 is connected to the lower chamber 124 through the fourth valve 4; one end of the fifth valve 5 is connected to the oil tank 9, and the other end is connected between the first valve 1 and the third valve 3; one end of the sixth valve 6 is connected to the oil tank 9, and the other end is connected between the second valve 2 and the fourth valve 4.

[0042] The first valve 1, the second valve 2, the fifth valve 5, and the sixth valve 6 are one-way valves, and the third valve 3 and the fourth valve 4 are two-way valves; the oil in the oil tank 9 can enter the interior of the length adjustment mechanism 12 through the first valve 1, the second valve 2, the third valve 3, and the fourth valve 4, and the oil inside the length adjustment mechanism 12 can enter the oil tank 9 through the third valve 3, the fourth valve 4, the fifth valve 5, and the sixth valve 6.

[0043] In this embodiment, the hydraulic adjustment module 30 of the spring correction device uses a sophisticated hydraulic system to precisely adjust the length of the spring 10. The core of this system is the length adjustment mechanism 12, which houses a piston 8. This piston 8 divides the interior of the length adjustment mechanism 12 into an upper chamber 123 and a lower chamber 124. The top of the piston 8 is welded to the bottom of the upper arm 121, ensuring structural stability. Changes in the dimensions of the two chambers alter the position of the piston 8 within the length adjustment mechanism 12, changing the distance between the upper arm 121 and the lower arm 122, thereby controlling the tension or compression of the spring 10.

[0044] The hydraulic pump 7 is connected to the oil tank 9, and the hydraulic pump 7 is connected to the upper chamber 123 in sequence through the one-way valve first valve 1 and the two-way valve third valve 3. The hydraulic pump 7 is connected to the lower chamber 124 in sequence through the one-way valve second valve 2 and the two-way valve fourth valve 4. The end of the third valve 3 facing away from the upper chamber 123 is connected to the oil tank 9 through the one-way valve fifth valve 5, and the end of the fourth valve 4 facing away from the lower chamber 124 is connected to the oil tank 9 through the one-way valve sixth valve 6.

[0045] When the spring 10 needs to be stretched, the electromagnetic heating module 20 first heats the spring 10 to soften it. Then, the first valve 1 and the sixth valve 6 are closed, and the second valve 2 and the fourth valve 4 are opened to allow oil to flow into the lower chamber 124. Simultaneously, the third valve 3 and the fifth valve 5 are opened to control the oil discharge from the upper chamber 123. This causes the piston 8 to move upward, which in turn drives the upper arm 121 away from the lower arm 122, stretching the spring 10 along its length.

[0046] Conversely, when the spring 10 needs to be compressed, the electromagnetic heating module 20 is also used to heat the spring. Then, the second valve 2 and the fifth valve 5 are closed, and the first valve 1 and the third valve 3 are opened to allow oil to flow into the upper chamber 123. Simultaneously, the fourth valve 4 and the sixth valve 6 are opened to control the oil discharge from the lower chamber 124. This causes the piston 8 to move downward, which in turn drives the upper arm 121 closer to the lower arm 122, compressing the spring 10 along its length.

[0047] This utility model enables fine adjustment of the spring length through a precisely controlled hydraulic system. This system utilizes the position of the piston within the length adjustment mechanism to vary the amount of oil in the upper and lower chambers, precisely controlling the distance between the upper and lower arms to achieve spring extension or compression. Through a carefully designed valve assembly, including a one-way valve and a two-way valve, the utility model flexibly controls the direction and speed of oil flow, ensuring that the spring can be precisely adjusted to the desired length after being heated and softened.

[0048] According to one embodiment of the present invention, a scale is provided on the upper arm 121 for displaying the distance between the upper arm 121 and the lower arm 122 .

[0049] In this embodiment, the upper arm 121 is designed to have scales, which are used to intuitively display the distance between the upper arm 121 and the lower arm 122. The scale is set on the upper arm 121 in the same direction as the spring 10 after it is fixed. The position of the lower arm 122 is fixed. By observing the scale at the position where the upper arm 121 exposes the upper chamber 123, the distance between the upper arm 121 and the lower arm 122 can be determined, thereby understanding the distance between the two ends of the spring 10. The setting of the scale provides a simple and direct visual feedback mechanism, making the adjustment process more precise and convenient. In this way, the operator can ensure that the spring 10 is stretched or compressed to the predetermined length, thereby achieving accurate spring correction.

[0050] The utility model improves the accuracy of spring correction, so that the operator can complete the spring adjustment work quickly and accurately.

[0051] According to one embodiment of the present invention, the spring 10 is connected to the upper arm 121 or the lower arm 122 via a locking cat claw 11 .

[0052] In this embodiment, the connection between the spring 10 and the upper arm 121 or the lower arm 122 is achieved by a locking claw 11. The upper arm 121 and the lower arm 122 are respectively fixed with a locking claw 11, which hooks the two ends of the spring 10 to ensure that the position of the spring 10 is stable during the spring correction process.

[0053] The utility model realizes stable fixation of the spring during the correction process by coordinating the locking cat claw with the upper arm and the lower arm, thereby improving the accuracy of spring adjustment and the convenience of operation.

[0054] According to one embodiment of the present invention, the electromagnetic heating module 20 includes an electromagnetic coil; the electromagnetic coil is disposed between the upper arm 121 and the lower arm 122;

[0055] An insulating layer is provided outside the electromagnetic coil to protect the electromagnetic coil and prevent current leakage.

[0056] In this embodiment, the electromagnetic heating module 20 includes an electromagnetic coil located between the upper arm 121 and the lower arm 122, effectively electromagnetically heating the spring 10 located therebetween. To ensure the safe operation of the electromagnetic coil and prevent current leakage, an insulating layer is provided around it. This insulating layer not only protects the electromagnetic coil but also mitigates potential electrical hazards, ensuring the safety and reliability of the entire spring correction device.

[0057] The utility model realizes safe and effective electromagnetic heating of the spring by arranging an electromagnetic coil with insulation protection between the upper arm and the lower arm, thereby improving the safety and reliability of the spring correction device.

[0058] According to one embodiment of the present invention, a spring-loaded safety valve 13 is provided at one end of the hydraulic pump 7 that is away from the oil tank 9 .

[0059] In this embodiment, a spring-loaded safety valve 13 is specifically installed at the end of the hydraulic pump 7 facing away from the oil tank 9. This safety valve's primary function is to provide overpressure protection within the hydraulic system, preventing system pressure from exceeding a safe limit. When system pressure reaches or exceeds a set value, the spring-loaded safety valve 13 automatically opens, releasing excess pressure and protecting the entire hydraulic system from damage and potential accidents. This design not only enhances system safety but also ensures stability and reliability during operation.

[0060] The utility model realizes overpressure protection of the hydraulic system by arranging the spring type safety valve, thereby enhancing the safety of operation and the stability of the system.

[0061] Example 2

[0062] According to an embodiment of the present invention, an electromagnetically heated, movable, scaled hydraulic spring correction device includes an electromagnetic heating module 20 and a hydraulic adjustment module 30 .

[0063] The electromagnetic heating module 20 is used to heat the spring 10 to be corrected which is fixed on the locking cat claw 11, causing it to undergo plastic deformation. The hydraulic pressure provided by the hydraulic pump 7 enters the upper chamber 123 and the lower chamber 124 of the piston 8 respectively, causing the piston 8 to move up and down, thereby driving the upper arm 121 to move, so as to adjust the length of the spring 10 and achieve the correction purpose.

[0064] The spring correction device provided by this utility model can efficiently and accurately restore the performance of springs used in industrial production, effectively preventing springs from being scrapped due to malfunctions. This utility model features an ingenious design, is easy to manufacture, and is highly practical. More importantly, its portability allows the device to be moved directly to the site for spring correction during equipment maintenance, significantly shortening maintenance time and reducing repair costs. Furthermore, the utility model is equipped with a graduated scale, providing a precise dimensional reference for spring correction, ensuring accuracy and reliability. This utility model not only solves many problems in the prior art but also provides a novel solution for spring maintenance in industrial production.

[0065] The process of correcting the spring in the utility model is as follows:

[0066] When the spring 10 needs to be stretched, it is electromagnetically heated by the electromagnetic heating module 20. After the spring 10 is softened, the first valve 1 and the sixth valve 6 are closed, and the second valve 2 and the fourth valve 4 are opened to allow oil to flow into the lower chamber 124. The third valve 3 and the fifth valve 5 are opened to control the oil unloading, so that the piston 8 moves upward, driving the upper arm 121 to stretch the spring 10 along the length direction of the spring 10.

[0067] When the spring 10 needs to be compressed, it is electromagnetically heated by the electromagnetic heating module 20 to soften the spring 10. Then, the second valve 2 and the fifth valve 5 are closed, and oil is admitted to the upper chamber 123 by opening the first valve 1 and the third valve 3. The fourth valve 4 and the sixth valve 6 are opened to control the oil unloading, so that the piston 8 moves downward, driving the upper arm 121 to compress the spring 10 along the length direction of the spring 10.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0069] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A spring correction device, characterized in that: include: A hydraulic adjustment module (30) and an electromagnetic heating module (20); The hydraulic adjustment module (30) is used to fix the two ends of the spring (10) and adjust the length of the spring (10) as needed; The electromagnetic heating module (20) is used to heat the spring (10) so that the spring (10) is softened and then shaped; the spring (10) is fixed by the hydraulic adjustment module (30) and is located on the side of the electromagnetic heating module (20).

2. The spring correction device according to claim 1, characterized in that: The hydraulic adjustment module (30) includes a hydraulic pump (7), an oil tank (9), and a length adjustment mechanism (12) that are connected to each other; The length adjustment mechanism (12) is provided with an upper arm (121) at the top and a lower arm (122) at the bottom; one end of the spring (10) is fixed to the upper arm (121) and the other end is fixed to the lower arm (122); the distance between the upper arm (121) and the lower arm (122) is adjusted by the hydraulic pump (7) and the oil tank (9).

3. The spring correction device according to claim 2, characterized in that: A piston (8) is provided inside the length adjustment mechanism (12), and the piston (8) divides the interior of the length adjustment mechanism (12) into an upper chamber (123) and a lower chamber (124); changes in the sizes of the upper chamber (123) and the lower chamber (124) change the position of the piston (8) in the length adjustment mechanism (12); and the top of the piston (8) is fixedly connected to the upper arm (121).

4. The spring correction device according to claim 3, characterized in that: The bottom of the upper arm (121) is welded to the piston (8).

5. The spring correction device according to claim 3, characterized in that: The hydraulic adjustment module (30) further includes six valves; One end of the hydraulic pump (7) is connected to the oil tank (9), and the other end is connected to the first valve (1) and the second valve (2) respectively; the end of the first valve (1) away from the second valve (2) is connected to the upper chamber (123) through the third valve (3); the end of the second valve (2) away from the first valve (1) is connected to the lower chamber (124) through the fourth valve (4); one end of the fifth valve (5) is connected to the oil tank (9), and the other end is connected between the first valve (1) and the third valve (3); one end of the sixth valve (6) is connected to the oil tank (9), and the other end is connected between the second valve (2) and the fourth valve (4); The first valve (1), the second valve (2), the fifth valve (5), and the sixth valve (6) are one-way valves, and the third valve (3) and the fourth valve (4) are two-way valves; the oil in the oil tank (9) can enter the interior of the length adjustment mechanism (12) through the first valve (1), the second valve (2), the third valve (3), and the fourth valve (4), and the oil in the interior of the length adjustment mechanism (12) can enter the oil tank (9) through the third valve (3), the fourth valve (4), the fifth valve (5), and the sixth valve (6).

6. The spring correction device according to claim 2, characterized in that: The upper arm (121) is provided with a scale for displaying the distance between the upper arm (121) and the lower arm (122).

7. The spring correction device according to claim 2, characterized in that: The spring (10) is connected to the upper arm (121) or the lower arm (122) via a locking cat claw (11).

8. The spring correction device according to claim 2, characterized in that: The electromagnetic heating module (20) comprises an electromagnetic coil; The electromagnetic coil is arranged between the upper arm (121) and the lower arm (122); An insulating layer is provided outside the electromagnetic coil, and the insulating layer is used to protect the electromagnetic coil and prevent current leakage.

9. The spring correction device according to claim 2, characterized in that: A spring-loaded safety valve (13) is provided at one end of the hydraulic pump (7) that is away from the oil tank (9).