Contracting device with accurate force releasing and buffering functions and restraining method

Abstract

The invention relates to the technical field of hydraulic pressure, in particular to a restraining device with accurate force releasing and buffering functions and a restraining method. The restraining device comprises 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 square hole is formed in the oil guide rod (709), the square hole is formed in the auxiliary valve sleeve (707), the square hole is communicated with the inner space of the oil guide rod (709), and when the square hole is pushed out of the valve sleeve, the square hole can be communicated with a low-pressure space (14) and a high-pressure space (15); and the guide rod (704) and the oil guide rod (709) are arranged on the piston and can move along with the piston. The restraining device has the advantages of being simple in structure, easy to maintain and high in reliability, and has the characteristics of repeated use and accurate release.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic technology, and particularly relates to a holdback device and a holdback method with precise release force and buffering function. BACKGROUND

[0002] The holdback device (also known as a stress dowel or a holdback bar) is a key safety device in an aircraft catapult system. It functions like a handbrake for an aircraft, firmly locking the aircraft on the catapult track before catapulting, and is automatically released when the engine thrust and the catapult force reach a predetermined value. The stress dowel vividly describes its working principle of achieving mortise-and-tenon connection and release by bearing a specific stress pulling force. The English name is Holdback bar or Arresting bar. The core function is to provide reliable locking before the catapulting of a carrier-based aircraft, ensuring that the aircraft is released only when the engine reaches full thrust, thereby avoiding accidental sliding.

[0003] The widely used holdback device, also known as a stress dowel, belongs to the type of mechanical holdback device. The main feature of this type of device is its complex mechanical structure, which is usually assembled from multiple high-precision components. Therefore, it has high requirements for manufacturing processes and assembly quality during operation. The release load range of this type of device is relatively large, which can adapt to the stress control requirements in different engineering scenarios. However, due to this feature, local stress concentration is prone to occur during use, affecting the reliability of the overall structure.

[0004] Due to the limitations of current domestic material technology and process level, the core components of this type of holdback device still have deficiencies in fatigue resistance and creep resistance, resulting in generally low actual reliable life. Especially in repeated load or high-frequency use environment, the components are prone to wear and plastic deformation, requiring frequent maintenance and replacement, which significantly increases the maintenance cost.

[0005] Currently, in many engineering practices in China, disposable pull-off bolts are still widely used as holdback means. Such bolts are broken after reaching the preset load, which can effectively achieve overload protection. However, their single-use characteristics significantly increase the material cost and replacement frequency in actual application, thereby further increasing the overall use cost.

[0006] If a stationary object is to reach a high-speed state in a short distance, a large pulling force is usually required to achieve a large acceleration, so as to realize fast start and acceleration. According to Newton's second law, acceleration is proportional to the force and inversely proportional to the mass of the object, so a larger force is the basis for generating a higher acceleration. However, the action of force is mutual. During the process of gradually increasing the pulling force, once the force exceeds the maximum static friction between the object and the contact surface, the object will slide relative to the contact surface and displace. This displacement will cause the effective force for acceleration to decrease, and the force application rate to decrease accordingly, so that a large acceleration cannot be achieved immediately.

[0007] To solve this problem, a special restraining device is needed, which can provide sufficient static holding force to stabilize the object in the stationary state at the initial stage. The device reliably restrains the object when the load does not exceed the set threshold value, avoiding premature movement; when the externally applied load exceeds the preset value, the device can quickly and reliably release, so that the entire force is applied to the object instantaneously, thereby achieving the maximum acceleration and rapidly entering the set motion state.

[0008] In this process, the performance of the restraining device directly determines the reliability of the acceleration process and the safety of the object. Two key points are particularly prominent: one is the accuracy of the release point. The device must quickly release at the moment when the load reaches the set value, neither too early nor too late. Too early release will result in insufficient acceleration, and too late release may cause sudden acceleration due to overload, causing impact on the structure of the object, and even causing damage. The second is the energy management and buffering after release. The restraining device often accumulates a certain amount of elastic potential energy when it is released, and if this energy is suddenly released, it may cause the device to bounce back or produce unexpected secondary actions, interfering with the motion trajectory of the object. Therefore, a buffering mechanism must be introduced into the structure to dissipate or absorb this part of the energy, ensuring that the device and the object are in a stable and controllable state after release.

[0009] These two problems are directly related to the reliability of the entire system and the safety of the moving body, so it is necessary to conduct in-depth research on the structural design, release mechanism and buffering system of the restraining device to achieve precise and controllable restraining and releasing functions.

[0010] On December 15, 2025, a search was conducted in the China Patent Publication Database with "restraining device and buffering and cone and hydraulic" as the abstract keywords, and the synonym expansion option was checked. No relevant literature was found.

[0011] On December 15, 2025, an abstract search was conducted on China's CNKI with "Restraining Device and Buffer and Cone and Hydraulic" as the search term. The search results did not include the following documents: "Development and Application of Car Tipping Machine System Technology" published on July 25, 2013, and "Research on Active Anti-Swing Control of High Sea State Lifeboat Launching and Retrieving Device" published on December 1, 2011.

[0012] On December 15, 2025, a search was conducted on the United States Patent and Trademark Office website with "Restraining Device with Buffer with Cone with Hydraulic" as the search term, and no relevant documents were found. The search website is https: / / ppubs.uspto.gov / pubwebapp / .

[0013] On December 15, 2025, a search was conducted on WIPO's https: / / patentscope2.wipo.int / with "Restraining Device and Buffer and Cone and Hydraulic" as the search term, and no relevant documents were found.

[0014] On December 15, 2025, a search was conducted on the Japanese Patent Office's website https: / / www.j-platpat.inpit.go.jp / with "Restraining Device and Buffer and Cone and Hydraulic" as the search term, and no relevant documents were found.

[0015] The concept of this patent is completely different from that of the present invention. SUMMARY

[0016] The purpose of the invention is to provide a restraining device and method with precise release force and buffer function, and the specific purposes are shown in the multiple technical effects in the specific implementation part.

[0017] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0018] The restraining device with precise release force and buffer function is characterized in that,

[0019] The restraining device comprises an outer cylinder 2 and an internal cavity 8; the outer cylinder 2 and the internal cavity 8 can slide and be limited relative to each other;

[0020] The piston rod 3 is arranged inside the cavity 8, the cavity 8 is filled with hydraulic oil, and the cavity 8 is divided into two parts, i.e., a low-pressure space 14 and a high-pressure space 15, by the piston of the piston rod 3; the piston rod 3 is surrounded by a main return spring 11;

[0021] The side of the cavity 8 is arranged with a clamping chuck 6, the clamping chuck 6 is arranged with a central hole of a piston of a protruding top piston rod 3 of a main valve 12, the central hole is used for connecting a low pressure space 14 and a high pressure space 15; the clamping chuck 6 and the cavity 8 are arranged with hydraulic sealing;

[0022] The clamping chuck 6 is arranged with a groove for locking two protrusions of the end of the U-shaped chuck 4;

[0023] The locking chuck 5 can lock the two protrusions of the end of the U-shaped chuck 4; the locking chuck 5 can be pushed relative to the outer cylinder 2 to unlock the U-shaped chuck 4;

[0024] The piston of the piston rod 3 is respectively arranged with two groups of auxiliary spring seats 705 and auxiliary springs 703; the two groups of auxiliary springs 703 are respectively penetrated by guide rods 704 and oil guide rods 709; the end of the guide rod 704 and the oil guide rod 709 are respectively penetrated by a tapered head penetrating a hole of a floating baffle 706;

[0025] The floating baffle 706 is clamped in the gap of the main reset spring 11;

[0026] The oil guide rod 709 is arranged with a square hole, the square hole is arranged in an auxiliary valve sleeve 707, the square hole is connected with 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;

[0027] The guide rod 704 and the oil guide rod 709 are arranged on the piston and can move together.

[0028] Further technical solutions of the present application are that the locking U-shaped chuck 4 can drive the clamping chuck 6 to further drive the cavity 8 to move, further drive the floating baffle to drive the platform 710 to move, and further drive the floating baffle 706 to move, so that the tapered head of the guide rod 704 and the oil guide rod 709 is separated from the contact with the floating baffle 706.

[0029] Further technical solutions of the present application are that the locking U-shaped chuck 4 can drive the clamping chuck 6 to further drive the cavity 8 to move, further drive the floating baffle to drive the platform 710 to move, and further drive the protrusion of the main valve 12 to open the main valve.

[0030] Further technical solutions of the present application are that the outer cylinder 2 is sleeved on the inner cavity 8, the outer cylinder 2 and the inner cavity 8 are both 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 with the piston rod 3 through the protection connecting rod 9.

[0031] Further technical solutions of the present application are that the outer cylinder 2 and the cavity 8 are matched in shape.

[0032] The further technical scheme of the present application is that the bottom of the outer cylinder 2 is sleeved on the hollow pull rod 10, and a locking reset spring 17 is arranged at the sleeving position, which can push the outer cylinder 2 to reset when the outer cylinder is pushed to expose the groove arranged on the clamping chuck 6 and then the U-shaped chuck 4 is installed.

[0033] The further technical scheme of the present application is that the hollow pull rod 10 is connected with the T-shaped rod 1, and the T-shaped rod 1 is arranged with a positioning part 20 in a cylindrical structure.

[0034] The clamping method with precise release force and buffering function has the characteristics that,

[0035] The clamping device with precise release force and buffering function has the characteristics that,

[0036] The clamping method with precise release force and buffering function has the characteristics that,

[0037] Locking: the outer cylinder is pushed to expose the groove arranged on the clamping chuck 6 and then the U-shaped chuck 4 is installed; the U-shaped chuck 4 is connected with the outer part;

[0038] Pulling and then accumulating force in stages: in the process of pulling, the locking U-shaped chuck 4 can drive the clamping chuck 6 to further drive the cavity 8 to move, further drive the floating partition to drive the platform 710 to move and then drive the protrusion of the main valve to move to open the main valve; the main hydraulic oil enters the low-pressure space from the high-pressure space through the main valve; then, the floating partition is further driven to drive the platform 710 to move and then drive the floating partition 706 to move, so that the guide rod 704 and the oil guide rod 709 are separated from the contact of the floating partition 706; the hydraulic oil further enters the low-pressure space from the high-pressure space; at this time, the main reset spring is compressed, and the auxiliary spring is also compressed;

[0039] Separation: when the groove arranged on the clamping chuck 6 is completely exposed, the locking chuck 5 cannot limit the U-shaped chuck 4 to be separated from the groove; instantaneous separation; the main reset spring and the auxiliary spring reset in stages to balance the hydraulic oil and the overall structure.

[0040] The further technical scheme of the present application is that the oil guide rod 709 and the auxiliary valve sleeve 707 form a sharp edge sealing structure. After the bypass valve is opened, the sealing sharp edge is opened, the hydraulic oil in the high-pressure cavity enters the low-pressure cavity of the piston rod 3, so that the hydraulic pressure in the high-pressure cavity can be quickly released.

[0041] In the working process of the restraining device, the piston rod 3 is subjected to tensile load and relative movement with the cavity 8. When the relative movement displacement of the piston rod 3 reaches the set displacement, the floating partition plate 706 is in contact with the hole step in the cavity 8. In the continuous movement process of the piston rod 3, the floating partition plate 706 pushes the auxiliary valve sleeve 707 to compress the auxiliary spring 703, so that the sharp edge seal formed by the auxiliary valve sleeve 707 and the oil guide rod 709 is opened; the hydraulic oil in the high-pressure cavity enters the low-pressure cavity through the square hole and the center hole of the oil guide rod 709, and the bypass valve is opened; when the restraining device is completed, the pressure difference between the left and right cavities of the piston rod 3 returns to zero, the piston rod 3 is reset, the auxiliary valve sleeve 707 and the floating partition plate 706 are restored to the initial position under the action of the auxiliary spring 703, and the bypass valve is closed.

[0042] The further technical scheme of the present application is that the valve sleeve sealing element 708 on the auxiliary valve sleeve 707 adopts the structure form of an O-shaped sealing ring and a protection ring.

[0043] The present application adopting the above technical scheme has the following beneficial effects compared with the prior art: the restraining device has the advantages of simple structure, easy maintenance and high reliability, and has the characteristics of repeated use and precise release, and can provide relatively stable restraining and releasing load; at the same time, the elastic potential energy of the restraining device after being subjected to load is released twice through the two-stage release buffer structure, so as to reduce the rebound after the release of the restraining device and not affect safety. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to further illustrate the present application, the following further illustrates the present application in conjunction with the drawings:

[0045] Figure 1 is a structural diagram of the present application;

[0046] Figure 2 is Figure 1 a structural diagram of the component 7;

[0047] Figure 3 is an arrangement diagram of the auxiliary valve sleeve;

[0048] Figure 4 is a side view of the piston rod;

[0049] Figure 5 is Figure 4 a B view of the present application;

[0050] Figure 6 is Figure 4 an A-A view of the present application;

[0051] Figure 7 is a sectional view of the oil guide rod;

[0052] Figure 8 is a perspective view of the oil guide rod;

[0053] Figure 9Figure 2 is a side view of the oil guide rod;

[0054] Figure 10 Figure 4 is a structural view of the valve sleeve;

[0055] Figure 11 Figure 6 is a locking state view of the invention;

[0056] Figure 12 Figure 8 is a view of the state to be unlocked;

[0057] Figure 13 Figure 10 is a calculation formula;

[0058] Wherein: 1. T-shaped rod; 2. outer cylinder; 3. piston rod; 4. U-shaped chuck; 5. locking clamping part; 6. restraining chuck; 7. oil return valve; 8. cavity; 9. protection connecting rod; 10. hollow pull rod; 11. main return spring; 12. main valve; 13. identification rod; 14. low pressure space; 15. high pressure space; 16. extrusion space; 17. locking return spring; 18. first valve port; 19. adjusting spring; 20. positioning part; 701. red 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 sealing element; 709. oil guide rod. DETAILED DESCRIPTION

[0059] The present application will be further clarified by the following examples and figures, which should not be taken as limiting the scope of the present application. In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships as shown in the drawings, and are used only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected internally between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] It is to be noted that the relative terms such as first and second and the like are used herein only to differentiate one entity or operation from another entity or operation without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0061] The patent provides a variety of parallel schemes, different expressions belong to improved schemes based on the basic scheme or parallel schemes. Each scheme has its own unique features. In addition, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other. The fixing mode not expressed in the text can be any one of the fixing modes such as threaded fixing, bolt fixing or glue bonding.

[0062] Embodiment one: in combination with all the drawings; the restraining device with precise release force and buffering function, characterized in that,

[0063] The restraining device comprises an outer cylinder 2 and an internal cavity 8; the outer cylinder 2 and the internal cavity 8 can slide and be limited relative to each other;

[0064] A piston rod 3 is arranged inside the cavity 8, the cavity 8 is filled with hydraulic oil, and the inside of the cavity 8 is divided into two parts, i.e. a low-pressure space 14 and a high-pressure space 15, by a piston of the piston rod 3; the piston rod 3 is surrounded by a main return spring 11;

[0065] A restraining chuck 6 is arranged on one side of the cavity 8, the restraining chuck 6 is arranged with a convex top of a main valve 12, which tightly presses the center hole of the piston of the piston rod 3, and the center hole is used for connecting the low-pressure space 14 and the high-pressure space 15; the restraining chuck 6 and the cavity 8 are arranged in hydraulic sealing;

[0066] The restraining chuck 6 is arranged with a groove for locking two protrusions at the end of the U-shaped chuck 4;

[0067] It also comprises 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 relatively push the outer cylinder 2 to unlock the U-shaped chuck 4;

[0068] Two groups of auxiliary spring seats 705 and auxiliary springs 703 are respectively arranged on the piston of the piston rod 3; a guide rod 704 and an oil guide rod 709 pass through the two groups of auxiliary springs 703 respectively; the end of the guide rod 704 and the oil guide rod 709 is provided with a tapered head which passes through the hole of a floating partition plate 706;

[0069] The floating partition plate 706 is clamped in the gap of the main return spring 11;

[0070] The guide oil rod 709 has a square hole arranged in the auxiliary valve sleeve 707, and the square hole is connected with the internal space of the guide oil rod 709. When the square hole is pushed out of the valve sleeve, the square hole can be connected with the low-pressure space 14 and the high-pressure space 15.

[0071] The guide rod 704 and the guide oil rod 709 are installed on the piston and can move together with the piston.

[0072] The substantial technical effects and the implementation process thereof, i.e., the basic functions and non-obviousness, are as follows:

[0073] The restraining method with precise release force and buffering function is characterized in that,

[0074] The restraining device with precise release force and buffering function is characterized in that,

[0075] The restraining device with precise release force and buffering function comprises the following steps:

[0076] Locking: the outer cylinder is pushed to expose the groove arranged on the restraining chuck 6, and the U-shaped chuck 4 is installed; the U-shaped chuck 4 is connected with the outer part;

[0077] Pulling and accumulating force in stages: in the pulling process, 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 plate to drive the platform 710 to move, so that the protrusion of the main valve is moved to open the main valve; the main hydraulic oil enters the low-pressure space from the high-pressure space through the main valve; then, the floating partition plate is further driven to drive the platform 710 to move, so that the guide rod 704 and the guide oil rod 709 are separated from the contact with the floating partition plate 706; the hydraulic oil further enters 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;

[0078] Separation: the restraining chuck 6 is pulled to expose the groove, and the locking chuck 5 cannot limit the U-shaped chuck 4 from being separated from the groove; instantaneous separation; the main return spring and the auxiliary spring are reset in stages, so that the hydraulic oil and the overall structure are balanced.

[0079] The restraining device has the advantages of simple structure, easy maintenance and high reliability, and has the characteristics of repeated use and precise release, and can provide relatively stable restraining 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 buffering structure, the rebound after the release of the restraining device is reduced, and the safety is not affected.

[0080] The hydraulic restraint device uses a high-pressure safety valve with a delayed closing function to release the load by opening the overpressure, has the characteristics of repeated release relative to the bolt, and has the characteristics of precise release, high reliability, and long service life relative to the mechanical restraint device. The restraint device has the advantages of simple structure, easy maintenance, and high reliability. At the same time, the elastic potential energy of the restraint device after being loaded is released twice through the two-stage release buffer structure, so that the restraint device falls naturally after release, without affecting safety. The main valve structure design utilizes the characteristics of stable opening force pressure and high reliability of the hydraulic high-pressure safety valve, and adopts a damping structure to delay the closing time of the high-pressure safety valve, so that the restraint device has the characteristics of repeated use and precise release, and also has the advantages of simple structure, easy maintenance, and high reliability. The two-stage release buffer structure is used to release the elastic potential energy of the restraint device after being loaded, reducing the rebound of the restraint device after release.

[0081] In a further improved scheme or parallel scheme or alternative independent scheme, the locking U-shaped clamp 4 can drive the restraint clamp 6 to further drive the cavity 8 to move, further drive the floating spacer to drive the table 710 to move, and further drive the floating baffle 706 to move, so that the guide rod 704 and the oil guide rod 709 cone head are separated from the contact of the floating baffle 706. The substantial technical effects and implementation process, i.e., basic functions and non-obviousness, are as follows: this embodiment provides a specific implementation structure of the two-stage release buffer structure.

[0082] In a further improved scheme or parallel scheme or alternative independent scheme, the locking U-shaped clamp 4 can drive the restraint clamp 6 to further drive the cavity 8 to move, further drive the floating spacer to drive the table 710 to move, and further drive the floating baffle 706 to move, so that the guide rod 704 and the oil guide rod 709 cone head are separated from the contact of the floating baffle 706. The substantial technical effects and implementation process, i.e., basic functions and non-obviousness, are as follows: this embodiment provides a specific implementation structure of the two-stage release buffer structure.

[0083] In a further improved scheme or parallel scheme or alternative independent scheme, the outer cylinder 2 is sleeved on the inner cavity 8, and the outer cylinder 2 and the inner cavity 8 are both sleeved on 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 protection connecting rod 9. The substantial technical effects and implementation process, i.e., basic functions and non-obviousness, are as follows: this embodiment provides a specific connection structure, and similar implementation structures are within the protection scope of the patent.

[0084] In a further improved scheme or parallel scheme or alternative independent scheme, the outer cylinder 2 and the cavity 8 are shaped to fit. The substantial technical effects and implementation process, i.e., basic functions and non-obviousness, are as follows: therefore, the entire structure is compact.

[0085] In the sixth embodiment, as a further improved scheme or a parallel scheme or an alternative independent scheme, the bottom of the outer cylinder 2 is sleeved on the hollow pull rod 10, and a locking reset spring 17 is arranged at the sleeving position, which can push the outer cylinder 2 to reset when the outer cylinder is pushed to expose the groove arranged by the clamping chuck 6 and then the U-shaped chuck 4 is installed.

[0086] In the seventh embodiment, as a further improved scheme or a parallel scheme or an alternative independent scheme, the hollow pull rod 10 is connected with the T-shaped rod 1, and the T-shaped rod 1 is arranged with a positioning part 20 in a cylindrical structure.

[0087] The oil guide rod 709 and the auxiliary valve sleeve 707 form a sharp edge sealing structure. After the bypass valve is opened, the sealing sharp edge is opened, and the hydraulic oil in the high-pressure cavity enters the low-pressure cavity of the piston rod 3, so that the hydraulic pressure in the high-pressure cavity is quickly released.

[0088] During the operation of the clamping device, the piston rod 3 is subjected to a tensile load and moves relative to the cavity 8. When the relative displacement of the piston rod 3 reaches a set displacement, the floating partition plate 706 contacts the step in the inner hole of the cavity 8. During the continuous movement of the piston rod 3, the floating partition plate 706 pushes the auxiliary valve sleeve 707 to compress the auxiliary spring 703, so that the auxiliary valve sleeve 707 and the oil guide rod 709 form an open sharp edge sealing structure; the hydraulic oil in the high-pressure cavity enters the low-pressure cavity through the square hole and the center hole of the oil guide rod 709, and the bypass valve is opened; when the clamping device is completed, the pressure difference between the left and right cavities of the piston rod 3 returns to zero, the piston rod 3 is reset, the auxiliary valve sleeve 707 and the floating partition plate 706 are restored to the initial position under the action of the auxiliary spring 703, and the bypass valve is closed. The valve sleeve sealing element 708 on the auxiliary valve sleeve 707 adopts the structure form of an O-shaped sealing ring and a protection ring.

[0089] The sealing ring is designed according to HB / Z 4-1995 “Design Requirements for O-shaped Sealing Rings and Sealing Structures”, the cross-sectional diameter of the sealing ring is Φ1.3, and the inner diameter is Φ8.5. The calculation of the stretching rate and the compression rate of the sealing ring is shown in the last drawing: the calculated stretching rate of the sealing ring is 1.051, which meets the requirement of the stretching rate of 1.04-1.06 specified in HB / Z 4-1995. The compression rate of the sealing ring is 20.425%, and the internal movable sealing compression rate specified in HB / Z 4-1995 is 12%-17%.

[0090] Independently, the above effects exist, and a set of structures can also be used to achieve the combination of the above results.

[0091] It should be noted that the modules of the present patent are integrated from existing modules and do not involve new modules. Even if part of the modules use programs, the programs are undoubtedly known programs.

[0092] It should be noted that the multiple schemes provided by the patent contain basic schemes, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0093] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of protection.

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.

8. A restraint method with precise release force and buffering function, characterized in that, The restraint device with precise release force and buffer function as described in any of the embodiments of claims 1-7 is used. 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) is connected 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 platform (710) to move, which in turn can cause 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 platform (710) to move, which in turn can push the floating partition (706) to move, which in turn can cause 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 squeezed, and the auxiliary spring is also squeezed; Release: Pull until the groove of the restraining chuck (6) is fully exposed, and the locking clamping part (5) can no longer restrict the U-shaped chuck (4) from dislodging outward from the groove; instantaneous release; the main return spring and the auxiliary spring reset in stages, so that the hydraulic oil and the overall structure are balanced.

9. The restraint method with precise release force and buffering function as described in claim 8, characterized in that, 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 subjected to 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 hole 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 chambers 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.

10. The restraint method with precise release force and buffering function as described in claim 9, characterized in that, The valve sleeve seal (708) on the auxiliary valve sleeve (707) adopts the structure of O-ring and protective ring.

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