Restraint device with precise release force and cushioning function

Abstract

The utility model relates to hydraulic technology field especially, and it is the device of pulling and holding with precise release force and buffer function. The device of pulling and holding contains outer tube (2) and internal cavity (8), outer tube (2) and internal cavity (8) can slide and limit each other, the square hole is contained on oil guide rod (709), and the square hole is placed in auxiliary valve bushing (707), and the square hole is connected with the internal space of oil guide rod (709), when the square hole is pushed out valve bushing, the square hole can connect low pressure space (14) and high pressure space (15), guide rod (704) and oil guide rod (709) are installed on the piston and can move together. The device of pulling and holding has the advantages of simple structure, easy maintenance, high reliability, and has the characteristics of repeated use, accurate release.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and in particular to a restraining device and restraining method with precise force release and buffering functions. Background Technology

[0002] The holding bar (also known as a stress tenon or holdback bar) is a key safety device in aircraft catapult systems. It acts like a handbrake, firmly locking the aircraft onto the catapult track before launch and automatically releasing it only when engine thrust and launch force reach predetermined values. The term "stress tenon" aptly describes its working principle of achieving a tenon-and-mortise connection and release by bearing specific stress tension. Its core function is to provide a reliable lock before carrier-based aircraft catapult launch, ensuring the aircraft is only released when the engine reaches full thrust, thus preventing accidental slippage.

[0003] Widely used restraint devices, also known as stress girders, belong to the category of mechanical restraint devices. The main characteristic of this type of device is its complex mechanical structure, typically assembled from multiple high-precision components. Therefore, it requires high manufacturing processes and assembly quality during operation. Its load release range is relatively large, enabling it to adapt to stress control needs in different engineering scenarios. However, precisely because of this, localized stress concentrations are prone to occur during use, affecting the overall structural reliability.

[0004] Due to limitations in current domestic material technology and manufacturing processes, the core components of this type of restraint device still lack sufficient fatigue resistance and creep resistance, resulting in a generally low actual reliable lifespan. Especially under repetitive loads or high-frequency operating environments, components are prone to wear and plastic deformation, requiring frequent maintenance and replacement, leading to high maintenance costs.

[0005] Currently, in many engineering practices in my country, one-time breakage bolts are still widely used as a means of overload control. These bolts break after reaching a preset load, which can effectively achieve overload protection, but their single-use characteristic significantly increases material costs and replacement frequency in practical applications, thereby further increasing the overall cost of use.

[0006] For a stationary object to achieve rapid motion over a short distance, a large pulling force is typically required to generate significant acceleration, enabling rapid start and acceleration. According to Newton's second law, acceleration is directly proportional to the force applied and inversely proportional to the object's mass; therefore, a larger force is fundamental to generating higher acceleration. However, forces are reciprocal. As the pulling force gradually increases, once it exceeds the maximum static friction between the object and the contact surface, the object will slide relative to the contact surface, resulting in displacement. This displacement reduces the effective force used for acceleration, correspondingly decreasing the acceleration rate, thus preventing the immediate achievement of significant acceleration.

[0007] To solve this problem, a special restraining device is needed that can provide sufficient static holding force in the initial stage to stabilize the object in a stationary state. This device reliably restrains the object when the load does not exceed a set threshold, preventing premature movement; and when the applied load exceeds the preset value, the device can quickly and reliably disengage, allowing all the force to be applied instantaneously to the object, thereby enabling it to achieve maximum acceleration and rapidly enter the set motion state.

[0008] In this process, the performance of the restraint device directly determines the reliability of the acceleration process and the safety of the object. Two key points are particularly prominent: First, the precision of the release point. The device must disengage rapidly the instant the load reaches the set value, neither too early nor too late. Releasing too early will result in insufficient acceleration, while releasing too late may cause a sudden change in acceleration due to overload, impacting the object's structure and even causing damage. Second, energy management and buffering after release. The restraint device often accumulates a certain amount of elastic potential energy when it disengages. If this energy is suddenly released, it may cause the device to rebound or produce unexpected secondary actions, interfering with the object's trajectory. Therefore, a buffering mechanism must be introduced into the structure to dissipate or absorb this energy, ensuring that the device and the object are in a stable and controllable state after release.

[0009] These two issues are directly related to the reliability of the entire system and the safety of the moving body. Therefore, it is necessary to conduct in-depth research on the structural design, release mechanism and buffer system of the restraint device in order to achieve precise and controllable restraint and release functions. Utility Model Content

[0010] The purpose of this utility model is to provide a restraining device and method with better effect, which has precise release force and buffer function. The specific purpose is explained in the specific implementation section for several substantial technical effects.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: The restraining device, characterized by precise force release and buffering function, is as follows: The restraining device includes an outer cylinder 2 and an inner cavity 8; the outer cylinder 2 and the inner cavity 8 can slide and be limited relative to each other; A piston rod 3 is arranged inside the cavity 8, and the cavity 8 is filled with hydraulic oil. The cavity 8 is divided into two parts by the piston of the piston rod 3, namely a low-pressure space 14 and a high-pressure space 15. A main return spring 11 is installed around the piston rod 3. A restraining chuck 6 is arranged on one side of the cavity 8. A protrusion of a main valve 12 is arranged in the restraining chuck 6 to press against the central hole of the piston of the piston rod 3. The central hole is used to connect the low-pressure space 14 and the high-pressure space 15. The restraining chuck 6 and the cavity 8 are hydraulically sealed. The restraining chuck 6 is provided with grooves for locking the two protrusions at the ends of the U-shaped chuck 4; It also includes a locking clamping part 5, which can lock the two protrusions at the end of the U-shaped chuck 4; the locking clamping part 5 can push the outer cylinder 2 relative to each other to unlock the U-shaped chuck 4; Two sets of auxiliary spring seats 705 and auxiliary springs 703 are respectively installed on the piston of piston rod 3; guide rods 704 and oil guide rods 709 pass through the two sets of auxiliary springs 703 respectively; the ends of guide rods 704 and oil guide rods 709 have conical heads that pass through the holes of floating partitions 706. The floating baffle 706 is held in the gap of the main return spring 11; The oil guide rod 709 includes a square hole, which is placed in the auxiliary valve sleeve 707. The square hole connects to the internal space of the oil guide rod 709. When the square hole is pushed out of the valve sleeve, the square hole can connect the low pressure space 14 and the high pressure space 15. Guide rod 704 and oil guide rod 709 are mounted on the piston and can move together with it.

[0012] A further technical solution of this utility model is that the locking U-shaped chuck 4 can drive the restraining chuck 6 to further drive the cavity 8 to move, which can further drive the floating partition to move the platform 710, thereby pushing the floating partition 706 to move, so that the guide rod 704 and the oil guide rod 709 cone head disengage from contact with the floating partition 706.

[0013] A further technical solution of this utility model is that the locking U-shaped chuck 4 can drive the restraining chuck 6 to further drive the cavity 8 to move, and further drive the floating partition to drive the platform 710 to move, thereby allowing the protrusion of the main valve 12 to move and open the main valve.

[0014] A further technical solution of this utility model is that the outer cylinder 2 is sleeved on the inner cavity 8, and both the outer cylinder 2 and the inner cavity 8 are sleeved on the outside of the piston rod 3. The bottom of the outer cylinder 2 is slidably sleeved on the hollow pull rod 10, and the hollow pull rod 10 is connected to the piston rod 3 through the protective connecting rod 9.

[0015] A further technical solution of this utility model is that the outer cylinder 2 and the cavity 8 are shaped to fit together.

[0016] A further technical solution of this utility model is that a locking return spring 17 is arranged at the bottom of the outer cylinder 2 where it slides on the hollow pull rod 10. When the outer cylinder is pushed to expose the groove of the restraining clamp 6 to install the U-shaped clamp 4, the locking return spring 17 can push the outer cylinder 2 to return to its original position.

[0017] A further technical solution of this utility model is that the hollow tie rod 10 is connected to the T-shaped rod 1, and the T-shaped rod 1 is provided with a positioning part 20, which is a cylindrical structure.

[0018] The restraint method, characterized by precise force release and buffering function, is as follows: Using the restraint device described above, which possesses precise release force and buffering function. It includes the following steps: Locking: The outer cylinder is pushed to expose the groove of the restraining chuck 6 for installing the U-shaped chuck 4; the U-shaped chuck 4 connects to the outer part; Pulling and then accumulating power in stages: During the pulling process, the locking U-shaped chuck 4 can drive the restraining chuck 6 to further drive the cavity 8 to move, which in turn can drive the floating partition to move the platform 710, thereby allowing the protrusion of the main valve 12 to move and open the main valve; the main hydraulic oil enters the low-pressure space from the high-pressure space through the main valve; subsequently, it can further drive the floating partition to move the platform 710, thereby pushing the floating partition 706 to move, thereby causing the guide rod 704 and the oil guide rod 709 cone to disengage from the floating partition 706; allowing the hydraulic oil to further enter the low-pressure space from the high-pressure space; at this time, the main return spring is compressed, and the auxiliary spring is also compressed; Release: Pull until the grooves of the restraining chuck 6 are fully exposed, and the locking clamping part 5 can no longer restrict the U-shaped chuck 4 from disengaging outward from the groove; instantaneous release; the main return spring and auxiliary spring reset in stages, allowing the hydraulic oil and the overall structure to balance.

[0019] A further technical solution of this utility model is that the guide rod 709 and the auxiliary valve sleeve 707 form a pointed edge sealing structure. After the bypass valve is opened, the sealing pointed edge opens, and the hydraulic oil in the high-pressure chamber enters the low-pressure chamber of the piston rod 3, so that the hydraulic energy in the high-pressure chamber is released quickly; During the operation of the restraining device, the piston rod 3 is subjected to tensile load and undergoes relative motion with the cavity 8. When the relative displacement of the piston rod 3 reaches the set displacement, the floating baffle 706 contacts the inner step of the cavity 8. As the piston rod 3 continues to move, the floating baffle 706 pushes the auxiliary valve sleeve 707 to compress the auxiliary spring 703, causing the pointed seal formed by the auxiliary valve sleeve 707 and the guide rod 709 to open; the hydraulic oil in the high-pressure chamber enters the low-pressure chamber through the square hole and the center hole of the guide rod 709, and the bypass valve opens; when the restraining device completes its release, the pressure difference between the left and right cavities of the piston rod 3 returns to zero, the piston rod 3 resets, and the auxiliary valve sleeve 707 and the floating baffle 706 return to their initial positions under the force of the auxiliary spring 703, and the bypass valve closes.

[0020] A further technical solution of this utility model is that the valve sleeve seal 708 on the auxiliary valve sleeve 707 adopts the structure of an O-ring and a protective ring.

[0021] The present invention, which adopts the above technical solution, has the following advantages over the prior art: the restraining device has the advantages of simple structure, easy maintenance and high reliability, and has the characteristics of reusability and precise release, which can provide a relatively stable restraining and release load; at the same time, the elastic potential energy of the restraining device after being loaded is released twice through the two-stage release buffer structure, which reduces the rebound of the restraining device after release and does not affect safety. Attached Figure Description

[0022] To further illustrate this utility model, the following description is provided in conjunction with the accompanying drawings: Figure 1 This is a structural diagram of the utility model; Figure 2 for Figure 1 Structural diagram of component 7; Figure 3 This is a layout diagram of the auxiliary valve sleeve; Figure 4 This is a side view of the piston rod; Figure 5 for Figure 4 B-direction graph; Figure 6 for Figure 4 AA-directed graph; Figure 7 This is a cross-sectional view of the oil guide rod; Figure 8 This is a 3D view of the oil guide rod; Figure 9 This is a side view of the oil guide rod; Figure 10 Here is a structural diagram of the valve sleeve; Figure 11 This is a diagram showing the locked state of the utility model. Figure 12The image shows the state to be unlocked; The components are as follows: 1. T-shaped rod; 2. Outer cylinder; 3. Piston rod; 4. U-shaped chuck; 5. Locking clamping part; 6. Traction chuck; 7. Return valve; 8. Cavity; 9. Protective connecting rod; 10. Hollow pull rod; 11. Main return spring; 12. Main valve; 13. Identifier rod; 14. Low-pressure space; 15. High-pressure space; 16. Extrusion space; 17. Locking return spring; 18. First valve oil port; 19. Adjusting spring; 20. Positioning part; 701. Copper pad; 702. Spring seat; 703. Auxiliary spring; 704. Guide rod; 705. Auxiliary spring seat; 706. Floating partition; 707. Auxiliary valve sleeve; 708. Valve sleeve seal; 709. Oil guide rod. Detailed Implementation

[0023] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] This patent provides multiple parallel solutions; the different descriptions represent improved or parallel solutions based on a basic solution. Each solution has its own unique characteristics. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. Fixing methods not described herein can be any type of fixing, such as threaded fixing, bolt fixing, or adhesive bonding.

[0026] Example 1: Referring to all the accompanying drawings; A restraining device with precise release force and buffering function, characterized in that, The restraining device includes an outer cylinder 2 and an inner cavity 8; the outer cylinder 2 and the inner cavity 8 can slide and be limited relative to each other; A piston rod 3 is arranged inside the cavity 8, and the cavity 8 is filled with hydraulic oil. The cavity 8 is divided into two parts by the piston of the piston rod 3, namely a low-pressure space 14 and a high-pressure space 15. A main return spring 11 is installed around the piston rod 3. A restraining chuck 6 is arranged on one side of the cavity 8. A protrusion of a main valve 12 is arranged in the restraining chuck 6 to press against the central hole of the piston of the piston rod 3. The central hole is used to connect the low-pressure space 14 and the high-pressure space 15. The restraining chuck 6 and the cavity 8 are hydraulically sealed. The restraining chuck 6 is provided with grooves for locking the two protrusions at the ends of the U-shaped chuck 4; It also includes a locking clamping part 5, which can lock the two protrusions at the end of the U-shaped chuck 4; the locking clamping part 5 can push the outer cylinder 2 relative to each other to unlock the U-shaped chuck 4; Two sets of auxiliary spring seats 705 and auxiliary springs 703 are respectively installed on the piston of piston rod 3; guide rods 704 and oil guide rods 709 pass through the two sets of auxiliary springs 703 respectively; the ends of guide rods 704 and oil guide rods 709 have conical heads that pass through the holes of floating partitions 706. The floating baffle 706 is held in the gap of the main return spring 11; The oil guide rod 709 includes a square hole, which is placed in the auxiliary valve sleeve 707. The square hole connects to the internal space of the oil guide rod 709. When the square hole is pushed out of the valve sleeve, the square hole can connect the low pressure space 14 and the high pressure space 15. Guide rod 704 and oil guide rod 709 are mounted on the piston and can move together with it.

[0027] The substantive technical effects and their implementation process, namely the basic functions and non-obviousness, are as follows: The restraint method, characterized by precise force release and buffering function, is as follows: Using the restraint device described above, which possesses precise release force and buffering function. It includes the following steps: Locking: The outer cylinder is pushed to expose the groove of the restraining chuck 6 for installing the U-shaped chuck 4; the U-shaped chuck 4 connects to the outer part; Pulling and then accumulating power in stages: During the pulling process, the locking U-shaped chuck 4 can drive the restraining chuck 6 to further drive the cavity 8 to move, which in turn can drive the floating partition to move the platform 710, thereby allowing the protrusion of the main valve 12 to move and open the main valve; the main hydraulic oil enters the low-pressure space from the high-pressure space through the main valve; subsequently, it can further drive the floating partition to move the platform 710, thereby pushing the floating partition 706 to move, thereby causing the guide rod 704 and the oil guide rod 709 cone to disengage from the floating partition 706; allowing the hydraulic oil to further enter the low-pressure space from the high-pressure space; at this time, the main return spring is compressed, and the auxiliary spring is also compressed; Release: Pull until the grooves of the restraining chuck 6 are fully exposed, and the locking clamping part 5 can no longer restrict the U-shaped chuck 4 from disengaging outward from the groove; instantaneous release; the main return spring and auxiliary spring reset in stages, allowing the hydraulic oil and the overall structure to balance.

[0028] This restraint device has the advantages of simple structure, easy maintenance, and high reliability. It is also reusable and can be released precisely, providing a relatively stable restraint and release load. At the same time, the elastic potential energy of the restraint device after being loaded is released twice through a two-stage release buffer structure, which reduces the rebound of the restraint device after release and does not affect safety.

[0029] The hydraulic restraint device utilizes the working principle of a high-pressure safety valve with a delayed closing function, releasing load upon overpressure opening. Compared to a pull-out bolt, it offers repeated release; compared to a mechanical restraint device, it features precise release, high reliability, and long service life. The restraint device boasts advantages such as simple structure, ease of maintenance, and high reliability. Simultaneously, a two-stage release buffer structure releases the elastic potential energy of the restraint device under load twice, allowing it to land naturally after release without compromising safety. The main valve structure design leverages the stable and reliable opening force of the hydraulic high-pressure safety valve and employs a damping structure to delay the valve's closing time, enabling the restraint device to be reused and release precisely. This also contributes to its simple structure, ease of maintenance, and high reliability. The two-stage release buffer structure further reduces rebound after release by releasing the elastic potential energy of the restraint device under load.

[0030] Example 2: As a further improvement, parallel, or optional independent solution, the locking U-shaped chuck 4 can drive the restraining chuck 6 to further move the cavity 8, which in turn can drive the floating partition to move the platform 710, thereby pushing the floating partition 706 to move, thus causing the guide rod 704 and the oil guide rod 709 to disengage from the floating partition 706. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: This embodiment provides a specific implementation of the two-stage release buffer structure.

[0031] Example 3: As a further improvement, parallel, or optional independent solution, the locking U-shaped chuck 4 can drive the restraining chuck 6 to further move the cavity 8, which in turn can drive the floating partition to move the platform 710, thereby allowing the protrusion of the main valve 12 to move and open the main valve. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: This example provides the main working process of the first stage.

[0032] Example 4: As a further improvement, parallel, or optional independent solution, the outer cylinder 2 is fitted onto the inner cavity 8. Both the outer cylinder 2 and the inner cavity 8 are fitted onto the outside of the piston rod 3. The bottom of the outer cylinder 2 is slidably fitted onto the hollow pull rod 10. The hollow pull rod 10 is connected to the piston rod 3 via a protective connecting rod 9. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: This embodiment provides a specific connection structure, and similar implementation structures are all within the protection scope of this patent.

[0033] Example 5: As a further improvement, parallel, or optional independent solution, the outer cylinder 2 and the cavity 8 are shaped to fit together. The substantial technical effect and its implementation process, i.e., the basic function and non-obviousness, are as follows: Therefore, the entire structure is compact.

[0034] Example 6: As a further improvement, parallel, or optional independent solution, a locking return spring 17 is arranged at the bottom of the outer cylinder 2 where it slides on the hollow pull rod 10. When the outer cylinder is pushed to expose the groove of the restraining clamp 6 to install the U-shaped clamp 4, the locking return spring 17 can push the outer cylinder 2 to return to its original position.

[0035] Example 7: As a further improvement, parallel, or optional independent solution, the hollow tie rod 10 is connected to the T-shaped rod 1, and the T-shaped rod 1 is provided with a positioning part 20, which is a cylindrical structure.

[0036] The guide rod 709 and the auxiliary valve sleeve 707 form a pointed edge sealing structure. After the bypass valve is opened, the pointed edge of the seal opens, and the hydraulic oil in the high-pressure chamber enters the low-pressure chamber of the piston rod 3, so that the hydraulic energy in the high-pressure chamber is released quickly. During the operation of the restraining device, the piston rod 3 is under tensile load and moves relative to the cavity 8. When the relative displacement of the piston rod 3 reaches the set displacement, the floating baffle 706 contacts the inner step of the cavity 8. As the piston rod 3 continues to move, the floating baffle 706 pushes the auxiliary valve sleeve 707 to compress the auxiliary spring 703, causing the pointed edge seal formed by the auxiliary valve sleeve 707 and the guide rod 709 to open; the hydraulic oil in the high-pressure chamber enters the low-pressure chamber through the square hole and the center hole of the guide rod 709, and the bypass valve opens; when the restraining device completes its release, the pressure difference between the left and right cavities of the piston rod 3 returns to zero, the piston rod 3 resets, and the auxiliary valve sleeve 707 and the floating baffle 706 return to their initial positions under the force of the auxiliary spring 703, and the bypass valve closes. The valve sleeve seal 708 on the auxiliary valve sleeve 707 adopts an O-ring and protective ring structure.

[0037] The sealing ring is designed according to HB / Z 4-1995 "Design Requirements for O-rings and Sealing Structures". The sealing ring has a cross-sectional diameter of Φ1.3 and an inner diameter of Φ8.5. The elongation and compression ratio of the sealing ring are calculated as follows: ; Calculations show that the sealing ring has an elongation of 1.051, which meets the requirement of 1.04 to 1.06 specified in HB / Z 4-1995. The sealing ring has a compression rate of 20.425%, while the internal moving seal compression rate specified in HB / Z 4-1995 is 12% to 17%.

[0038] Innovatively, each of the above effects exists independently, yet a single structure can be used to combine the results.

[0039] It should be noted that the multiple modules in this patent are an integration of existing technology modules and do not involve any new modules. Even if some modules use programs, those programs are undoubtedly known programs.

[0040] It should be noted that the multiple solutions provided in this patent include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other without conflict to achieve multiple effects.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. A restraining device with precise release force and buffering function, characterized in that, The restraining device includes an outer cylinder (2) and an inner cavity (8); the outer cylinder (2) and the inner cavity (8) can slide and be limited relative to each other; A piston rod (3) is arranged inside the cavity (8), and the cavity (8) is filled with hydraulic oil. The cavity (8) is divided into two parts by the piston of the piston rod (3), namely a low-pressure space (14) and a high-pressure space (15). A main return spring (11) is installed around the piston rod (3). A restraining chuck (6) is arranged on one side of the cavity (8). A protrusion of a main valve (12) is arranged in the restraining chuck (6) to press against the central hole of the piston rod (3). The central hole is used to connect the low-pressure space (14) and the high-pressure space (15). The restraining chuck (6) and the cavity (8) are hydraulically sealed. The restraining chuck (6) is provided with grooves for locking the two protrusions at the end of the U-shaped chuck (4); It also includes a locking clamping part (5), which can lock the two protrusions at the end of the U-shaped chuck (4); the locking clamping part (5) can push the outer cylinder (2) relative to each other to unlock the U-shaped chuck (4); Two sets of auxiliary spring seats (705) and auxiliary springs (703) are respectively installed on the piston of the piston rod (3); guide rods (704) and oil guide rods (709) pass through the two sets of auxiliary springs (703); the ends of guide rods (704) and oil guide rods (709) have cones that pass through the holes of floating partitions (706); The floating baffle (706) is held in the gap of the main return spring (11); The oil guide rod (709) has a square hole, which is placed in the auxiliary valve sleeve (707). The square hole connects the internal space of the oil guide rod (709). When the square hole is pushed out of the valve sleeve, the square hole can connect the low pressure space (14) and the high pressure space (15). The guide rod (704) and the oil guide rod (709) are mounted on the piston and can move together with it.

2. The restraining device with precise release force and buffering function as described in claim 1, characterized in that, The locking U-shaped chuck (4) can drive the restraining chuck (6) to further drive the cavity (8) to move, which in turn can drive the floating partition to move the stage (710), thereby pushing the floating partition (706) to move, and thus causing the guide rod (704) and the oil guide rod (709) to disengage from contact with the floating partition (706).

3. The restraining device with precise release force and buffering function as described in claim 1, characterized in that, The locking U-shaped chuck (4) can drive the restraining chuck (6) to move the cavity (8), which in turn can drive the floating partition to move the platform (710), thereby allowing the protrusion of the main valve (12) to move and open the main valve.

4. The restraining device with precise release force and buffering function as described in claim 1, characterized in that, The outer cylinder (2) is fitted onto the inner cavity (8). Both the outer cylinder (2) and the inner cavity (8) are fitted onto the outside of the piston rod (3). The bottom of the outer cylinder (2) is slidably fitted onto the hollow pull rod (10). The hollow pull rod (10) is connected to the piston rod (3) through the protective connecting rod (9).

5. The restraining device with precise release force and buffering function as described in claim 1, characterized in that, The outer cylinder (2) and the cavity (8) are shaped to fit together.

6. The restraining device with precise release force and buffering function as described in claim 4, characterized in that, A locking return spring (17) is arranged at the bottom of the outer cylinder (2) where it slides onto the hollow pull rod (10). When the outer cylinder is pushed to expose the groove of the restraining chuck (6) to install the U-shaped chuck (4), the locking return spring (17) can push the outer cylinder (2) to reset.

7. The restraining device with precise release force and buffering function as described in claim 4, characterized in that, The hollow tie rod (10) is connected to the T-shaped rod (1), and the T-shaped rod (1) is provided with a positioning part (20), which is a cylindrical structure.

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