Reusable pressure-resistant waterproof pin puller driven by SMA (Shape Memory Alloy) wire

Abstract

The invention belongs to the technical field of pin pullers, and particularly relates to an SMA wire driven reusable pressure-resistant waterproof pin puller which comprises a pin shaft, a memory alloy wire, a pin pulling spring, a clamping ball, a sliding block, an outer shell and a mounting flange, the mounting flange covers the outer shell, and the pin shaft can be inserted into the outer shell in an up-down sliding mode; the pin pulling spring is arranged around the periphery of the pin shaft, the sliding block sleeves the periphery of the pin shaft, and the memory alloy wire is connected with the sliding block; in a locking state, the pin pulling spring is compressed, and the clamping ball is clamped in the clamping groove in the pin shaft, so that the pin shaft cannot slide up and down; when release is needed, the memory alloy wire is powered on to drive the sliding block to move downwards, the clamping ball slides into the containing groove in the sliding block, the pin pulling spring drives the pin shaft to retract, the pin pulling action is achieved, and the pin puller has the advantages of being low in impact, free of pollution, good in sealing performance, capable of being repeatedly used and large in pin pulling force and pin pulling stroke.

Description

Technical Field

[0001] The invention belongs to the technical field of pin pullers, and in particular relates to a reusable pressure-resistant and waterproof pin puller driven by an SMA wire. Background Art

[0002] Connection and separation devices are widely used in many fields. At present, underwater connection and separation mechanisms generally use pyrotechnic connection and separation devices. Pyrotechnic connection and separation devices use gunpowder explosion as the driving energy. They are filled with gunpowder or explosives. When stimulated by external factors, they burn or explode, and blow off bolts and other connecting structures to achieve structural separation.

[0003] In recent years, with the development of underwater equipment and changes in application scenarios, higher requirements have been put forward for underwater connection and separation devices, such as higher safety requirements, low impact requirements, low noise requirements and deep-water actuation requirements. However, the pyrotechnic agents of commonly used pyrotechnic connection and separation devices are extremely sensitive to environmental factors such as friction, impact, static electricity, impact, and heat. Once an accident occurs, it will cause fatal or even catastrophic consequences to equipment and personnel. Therefore, the pyrotechnic connection and separation device has high safety requirements, and it is easy to cause serious consequences after accidental ignition. In addition, the impact generated during the unlocking process of the pyrotechnic connection and separation device is large, which cannot meet the low-impact use requirements. Furthermore, the pyrotechnic connection and separation device will also produce smoke and dust pollution, which is easy to cause damage to the precision load carried by the equipment. In addition, the pyrotechnic connection and separation device is generally not reusable, and the reliability of the product cannot be verified through ground tests, and the cause of the fault cannot be found. Conventional pyrotechnic connection and separation devices have poor underwater pressure resistance and insufficient sealing. They are prone to water ingress and device failure when used in deep water environments. At the same time, due to long-term duty in seawater, the surface anti-fouling and anti-corrosion performance decreases, making it difficult for the performance to meet the system's use requirements.

[0004] In addition to the pyrotechnic connection and separation device, the pin puller is also a commonly used connection and separation device. According to the power source and structural design, the pin puller can be divided into manual pin pullers, hydraulic pin pullers, pneumatic pin pullers and other types. Usually, a pin puller is a linear motion mechanism with the function of connecting and separating the structure. In the reset locking state, the pin head extends to achieve the connection of the structure; in the unlocked separation state, the pin head is retracted to achieve the separation of the structure. Using a pin puller to replace the traditional pyrotechnic connection and separation device and using the pin puller for underwater equipment is expected to meet the special needs of the underwater environment. However, the existing pin pullers have poor pressure resistance and waterproofness, low safety for underwater use, and the pin pulling force and pin pulling stroke of the pin puller are small, and the impact is large, which cannot meet the use requirements of underwater equipment.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a SMA wire-driven reusable pressure-resistant and waterproof pin puller in view of the above-mentioned technical problems, which has the advantages of low impact, no pollution, good sealing, reusability, large pin pulling force and pin pulling stroke.

[0007] In view of this, the present invention provides a reusable pressure-resistant and waterproof pin puller driven by an SMA wire, comprising:

[0008] Pin shaft, memory alloy wire, pin puller spring, positioning ball, slider, outer shell and mounting flange, among which,

[0009] The mounting flange is covered on the outer shell to form a closed space;

[0010] The pin shaft can be slidably inserted into the outer shell after passing through the mounting flange up and down;

[0011] The pin pulling spring is arranged around the periphery of the pin shaft, with its lower end abutting against the lower end of the pin shaft and its upper end abutting against the top of the inner shell;

[0012] The slider is sleeved on the periphery of the pin shaft, and the memory alloy wire is connected to the slider and can drive the slider to slide along the axial direction of the pin shaft;

[0013] When the locking device is in a locked state, the pin pulling spring is compressed, and the locking ball is locked in the locking groove on the pin shaft, so that the pin shaft cannot slide up and down; when release is required, the memory alloy wire is energized, undergoes phase change and shrinkage, drives the slider to move downward along the axial direction of the pin shaft, and the locking ball slides into the accommodating groove on the slider, thereby losing the axial locking effect on the pin shaft, and the pin pulling spring recovers its deformation, driving the pin shaft to retract into the outer shell, thereby realizing the pin pulling action.

[0014] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0015] The inner shell is located in the outer shell and defines a housing space for the pin shaft and the pin pulling spring.

[0016] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller also includes:

[0017] A watertight socket is electrically connected to the memory alloy wire, and the watertight socket can control the on and off state of the memory alloy wire.

[0018] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0019] A first sealing ring provided at the connection between the mounting flange and the outer shell;

[0020] A second sealing ring provided at the connection between the pin shaft and the mounting flange;

[0021] And a third sealing ring is arranged at the connection between the watertight socket and the outer shell.

[0022] Furthermore, a through hole for the pin to pass through is provided on the mounting flange, a limiting cylinder is provided on the lower side of the through hole, the limiting cylinder is sleeved on the periphery of the pin, and the inner diameter of the limiting cylinder is equal to the outer diameter of the pin;

[0023] The second sealing ring is located at the connection between the limiting cylinder and the pin shaft;

[0024] A limiting hole is provided on the limiting cylinder. In a locked state, the locking ball is partially locked in the locking groove and partially locked in the limiting hole. When unlocked, the locking ball can pass through the limiting hole and slide into the accommodating groove on the slider.

[0025] Furthermore, the slider includes:

[0026] A sleeve portion, which is slidably sleeved on the periphery of the pin shaft, and in a locked state, the locking ball is located between the locking groove on the pin shaft and the sleeve portion;

[0027] The connecting portion is used to be connected to one end of the memory alloy wire, and the other end of the memory alloy wire is connected to the lower end of the inner shell.

[0028] The receiving groove is used to receive the locking ball in the unlocked state.

[0029] Furthermore, the receiving groove is located on the upper side of the sleeve portion, and the receiving groove is an annular cylindrical structure with an inner diameter greater than that of the sleeve portion, and the distance between the receiving groove and the pin shaft is greater than or equal to the diameter of the retaining ball.

[0030] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0031] A buffer pad and a bottom plate, wherein the bottom plate is connected to the lower end of the inner shell to form the bottom surface of the inner shell, and the buffer pad is arranged on the upper side of the bottom plate.

[0032] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0033] A gasket, which is sleeved on the periphery of the pin shaft and is located on the inner side of the pin pulling spring;

[0034] an anti-impact spring located outside the pin shaft;

[0035] The upper end of the anti-impact spring abuts against the lower end of the sleeve portion in the slider, and the lower end of the anti-impact spring abuts against the lower end of the pin shaft.

[0036] The beneficial effects of the present invention are:

[0037] First, the present invention improves the structure of the pin puller and adds sealing measures, so that the pin puller has pressure-resistant and waterproof functions and can be used for locking and separating underwater equipment.

[0038] Second, the present invention adopts a watertight plug as the power supply connection mode of the pin puller, which improves the power supply connection mode of the pin puller, so that the wire for supplying power to the SMA wire is also safe and reliable in an underwater environment, and the connection mode is simple. At the same time, the watertight plug is adopted as the power supply connection mode of the pin puller, so that the power supply of the pin puller is safe and reliable, and the power supply is connected by plugging and unplugging the plug and the socket, and the connection mode is simple and convenient.

[0039] Thirdly, the present invention improves the structure of the pin puller, so that the pin pulling force of the pin puller reaches more than 350N, the pin pulling stroke reaches 15mm, and the pin puller can be reused.

[0040] The invention adopts sealing rings for sealing at the end face matching and shaft hole matching of the pin puller, adopts a watertight plug for power supply connection, and adopts a pressure-resistant design in structure to achieve waterproof sealing performance of the pin puller. Combined with the improvement of unlocking and releasing methods, the pin puller has the advantages of low impact, no pollution, good sealing, reusability, large pin pulling force and pin pulling stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic cross-sectional structure diagram of the pin puller of the present invention in a locked state;

[0042] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the middle A area;

[0043] Figure 3 is a schematic diagram of the unlocking process of the pin puller of the present invention;

[0044] Figure 4 is a schematic cross-sectional structural diagram of the pin puller of the present invention in an unlocked state;

[0045] Figure 5 It is a three-dimensional structural schematic diagram of a slider in the pin puller of the present invention;

[0046] The symbols in the figure are:

[0047] 1. Pin shaft; 101. Snap-fit ​​groove; 2. Mounting flange; 201. Limiting cylinder; 202. Limiting hole; 3. Sealing ring; 301. First sealing ring; 302. Second sealing ring; 303. Third sealing ring; 304. Fourth sealing ring; 4. Memory alloy wire; 5. Pull-out spring; 6. Outer shell; 7. Inner shell; 8. Buffer pad; 9. Bottom plate; 10. Watertight socket; 11. Snap-fit ​​ball; 12. Slider; 1201. Sleeve part; 1202. Connecting part; 1203. Accommodating groove; 13. Anti-impact spring; 14. Gasket. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0049] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0051] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words 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, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0052] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0053] like Figures 1 to 5 As shown, a reusable pressure-resistant and waterproof pin puller driven by an SMA wire comprises:

[0054] The pin shaft 1, the memory alloy wire 4, the pin pulling spring 5, the positioning ball 11, the slider 12, the outer shell 6 and the mounting flange 2, wherein:

[0055] The mounting flange 2 covers the outer shell 6 to form a closed space;

[0056] The pin shaft 1 can slide up and down through the mounting flange 2 and then be inserted into the outer shell 6;

[0057] The pin pulling spring 5 is arranged around the periphery of the pin shaft 1, with its lower end abutting against the lower end of the pin shaft 1 and its upper end abutting against the top of the inner shell 7;

[0058] The slider 12 is sleeved on the periphery of the pin shaft 1, and the memory alloy wire 4 is connected to the slider 12 and can drive the slider 12 to slide along the axial direction of the pin shaft 1;

[0059] In the locked state, the pin pulling spring 5 is compressed, and the locking ball 11 is locked in the locking groove 101 on the pin shaft 1, so that the pin shaft 1 cannot slide up and down; when it needs to be released, the memory alloy wire 4 (SMA wire) is energized and undergoes phase change and contraction, driving the slider 12 to move downward along the axial direction of the pin shaft 1, and the locking ball 11 slides into the receiving groove 1203 on the slider 12, thereby losing the axial locking effect on the pin shaft 1, and the pin pulling spring 5 restores its deformation, driving the pin shaft 1 to retract into the outer shell 6, thereby realizing the pin pulling action.

[0060] The pin puller of the present invention drives the slider 12 to move by the phase change contraction of the memory alloy wire 4 (SMA wire) when it is energized, thereby releasing the pin shaft 1. In this process, the contraction of the SMA wire is smooth and controllable, avoiding the sudden impact that may be generated by the traditional unlocking mechanism, and has low impact. This low impact feature helps to reduce the impact on the equipment and improve the stability and reliability of the system.

[0061] The pin puller of the present invention uses a physical structure to achieve unlocking, does not involve chemical reactions or explosions, and therefore does not generate pollutants. This non-polluting feature makes the pin puller have significant advantages in situations where environmental protection requirements are high, and is also conducive to the long-term stable operation of the equipment.

[0062] The pin puller of the present invention is covered on the outer shell 6 by the mounting flange 2 to form a closed space, and this design helps to prevent moisture and impurities from entering the interior of the pin puller. Good sealing allows the pin puller to work stably in a humid or underwater environment.

[0063] The memory alloy wire 4 used in the pin puller of the present invention has a shape memory effect and can restore to its original state after multiple phase changes after being powered on. Therefore, the pin puller can be reused, which is beneficial to reducing the use cost and improving the economic benefit.

[0064] The pin pulling spring 5 in the pin puller of the present invention surrounds the outer periphery of the pin shaft 1. When the SMA wire contracts and releases the pin shaft 1, the pin pulling spring 5 can quickly recover its deformation and drive the pin shaft 1 to retract inward. This design ensures the pin pulling force and pin pulling stroke of the pin puller, and can obtain a large pin pulling force and pin pulling stroke. The large pin pulling force and pin pulling stroke help ensure that the pin puller can reliably complete the unlocking task under various working conditions.

[0065] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0066] The inner shell 7 is located inside the outer shell 6 , and defines an accommodation space for the pin shaft 1 and the pin pulling spring 5 .

[0067] By adding an inner shell 7 to the above-mentioned pin puller, the inner shell 7 can be used to provide additional support for the pin shaft 1 and the pin pulling spring 5, which helps to enhance the structural strength and stability of the entire pin puller. At the same time, during the pin pulling process, the inner shell 7 can prevent the outer shell 6 from being deformed due to excessive force, thereby ensuring the smooth progress of the pin pulling action. In addition, the inner shell 7 separates the accommodating space of the pin shaft 1 and the pin pulling spring 5 from the other parts of the outer shell 6, making the internal space layout of the pin puller more reasonable and compact. An additional sealing layer can be formed between the inner shell 7 and the outer shell 6, which helps to improve the overall sealing performance of the pin puller, prevent moisture and impurities from entering the interior of the pin puller, and thus extend the service life of the pin puller. Furthermore, the inner shell 7 provides accurate positioning for the pin shaft 1 and the pin pulling spring 5, which helps to ensure the accuracy and reliability of the pin pulling action. At the same time, the smooth surface of the inner shell 7 can reduce the friction resistance of the pin shaft 1 and the pin pulling spring 5 during movement, thereby improving the pin pulling efficiency.

[0068] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0069] A watertight socket 10 is installed on one side of the outer shell 6 . The watertight socket 10 is electrically connected to the memory alloy wire 4 . The watertight socket 10 can control the on / off state of the memory alloy wire 4 .

[0070] By setting a watertight socket 10 in the pin puller, it can effectively prevent water and moisture from entering the inside of the pin puller due to its excellent waterproof performance, thereby protecting the internal electrical components from damage, which enables the pin puller to work stably in harsh environments such as humid, rainy and even underwater, and broadens its application range. At the same time, through the watertight socket 10, the user can remotely control the power-on and power-off state of the memory alloy wire 4 without directly contacting the inside of the pin puller. This remote control method simplifies the operation process and improves work efficiency, especially in situations where the pin puller needs to be operated frequently. More importantly, the watertight socket 10 provides an electrical isolation function, which can reduce the safety risks caused by electrical failures. During the operation, the user does not need to directly contact the high-voltage power supply or high-temperature components, thereby protecting the safety of the operator. In addition, the introduction of the watertight socket 10 makes the pin puller more modular, easy to maintain and upgrade. When the watertight socket 10 fails or needs to be upgraded, the user can quickly replace it without affecting the use of the entire pin puller. Due to the introduction of the watertight socket 10, the pin puller of the present invention can work stably in an underwater environment and is suitable for fields such as ocean observation and underwater robots. In special environments such as humidity and dust, the pin puller of the present invention can also exert its unique advantages to ensure the stable operation of the equipment.

[0071] Furthermore, the reusable pressure-resistant and waterproof pin puller driven by the SMA wire also includes a plurality of sealing rings 3, such as a first sealing ring 301 arranged at the connection between the mounting flange 2 and the outer shell 6, a second sealing ring 302 arranged at the connection between the pin shaft 1 and the mounting flange 2, a third sealing ring 303 arranged at the connection between the watertight socket 10 and the outer shell 6, and a fourth sealing ring 304 arranged in the watertight socket 10. Through the arrangement of the plurality of sealing rings 3, the sealing connection between the mounting flange 2 and the outer shell 6, the pin shaft 1 and the mounting flange 2, and the watertight socket 10 and the outer shell 6 can be achieved, thereby improving the pressure-resistant and waterproof performance of the reusable pressure-resistant and waterproof pin puller driven by the SMA wire. The arrangement of the fourth sealing ring 304 can improve the pressure-resistant and waterproof performance of the watertight socket 10. Finally, the reusable pressure-resistant and waterproof pin puller driven by the SMA wire has good pressure-resistant and waterproof performance, and can operate safely and well in an underwater environment.

[0072] Furthermore, a through hole for the pin shaft 1 to pass through is provided on the mounting flange 2, and a limiting cylinder 201 is provided on the lower side of the through hole. The limiting cylinder 201 is sleeved on the periphery of the pin shaft 1, and the inner diameter of the limiting cylinder 201 is equal to the outer diameter of the pin shaft 1. The second sealing ring 302 is located at the connection between the limiting cylinder 201 and the pin shaft 1.

[0073] By setting the limiting cylinder 201, on the one hand, the pin shaft 1 can be limited so that it can only move along the axial direction of the limiting cylinder 201; on the other hand, the sealing performance of the connection between the mounting flange 2 and the pin shaft 1 can be improved, thereby improving the pressure resistance and waterproof performance of the pin puller.

[0074] Furthermore, a limiting hole 202 is provided on the limiting cylinder 201, and the diameter of the limiting hole 202 is equal to or slightly larger than the diameter of the locking ball 11, so that the locking ball 11 can pass through the limiting hole 202 and slide into the receiving groove 1203 on the slider 12 when unlocked. More importantly, in the locked state, the locking ball 11 can be partially inserted into the clamping groove 101 and partially inserted into the limiting hole 202, and the locking ball 11 can be limited by the limiting hole 202, thereby limiting the pin 1, so that it cannot slide up and down in the limiting cylinder 201.

[0075] Furthermore, the structure of the slider 12 is as follows: Figure 5 As shown, it includes:

[0076] A sleeve portion 1201 is slidably sleeved on the periphery of the pin shaft 1, the inner diameter of the sleeve portion 1201 is equal to or slightly larger than the outer diameter of the limiting cylinder 201, and in a locked state, the locking ball 11 is located between the locking groove 101 on the pin shaft 1 and the sleeve portion 1201;

[0077] A connecting portion 1202, which is used to connect with the memory alloy wire 4;

[0078] The receiving groove 1203 is used to receive the locking ball 11 in the unlocked state.

[0079] As some embodiments of the present invention, the connecting portion 1202 is located at both ends of the slider 12 , and a through hole is provided on the connecting portion 1202 . One end of the memory alloy wire 4 is clamped in the through hole, and the other end is connected to the lower end of the inner shell 7 .

[0080] As some embodiments of the present invention, the receiving groove 1203 is located on the upper side of the sleeve portion 1201, and the receiving groove 1203 is an annular cylindrical structure with an inner diameter larger than that of the sleeve portion 1201. The distance between the receiving groove 1203 and the pin shaft 1 is greater than or equal to the diameter of the locking ball 11. In this way, in the unlocked state, the locking ball 11 can slide into the receiving groove 1203 to release the limitation on the pin shaft 1.

[0081] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0082] The buffer pad 8 and the bottom plate 9 are arranged on the upper side of the bottom of the outer shell 6, and the bottom plate 9 is connected to the lower end of the inner shell 7 to form the bottom surface of the inner shell 7. The buffer pad 8 is arranged on the upper side of the bottom plate 9. The double-layer vibration damping structure formed by the bottom plate 9 and the buffer pad 8 can play a buffering role when the pin shaft 1 is unlocked and retracted, thereby reducing the impact of the unlocking process.

[0083] Furthermore, the SMA wire-driven reusable pressure-resistant and waterproof pin puller further comprises:

[0084] A gasket 14, which is sleeved on the periphery of the pin shaft 1, and the gasket 14 is located on the inner side of the pin pulling spring 5;

[0085] An anti-impact spring 13, which is located outside the pin 1;

[0086] The anti-impact spring 13 is arranged on the periphery of the pin shaft 1 and located on the inner side of the pin pulling spring 5 , the upper end of the anti-impact spring 13 abuts against the lower end of the sleeve portion 1201 in the slider 12 , and the lower end of the anti-impact spring 13 abuts against the lower end of the pin shaft 1 .

[0087] In the pin puller of the present invention, the anti-impact spring 13 supports the slider 12 in the locked state and pushes the slider 12 upward to the uppermost end. In the locked state, the anti-impact spring 13 is in a compressed state. When the pin puller is unlocked, the pin pulling spring 5 provides the pin pulling force for the unlocking action, and the memory alloy wire 4 resists the elastic force of the anti-impact spring 13 to pull down the slider 12. This arrangement can make the pin puller run stably and not easily released accidentally due to shock and other factors. At the same time, when unlocking is required, the pin shaft 1 can be quickly retracted to achieve unlocking and release.

[0088] In the pin puller described in the present invention, when the pin puller is in a locked state, the end execution component remains fixed under the limiting action of the locking ball 11, and can withstand certain axial and radial loads, ensuring that the pin puller has a reliable connection function. When it is necessary to release, the memory alloy wire 4 (SMA wire) is energized, and the memory alloy wire 4 heats up due to its own resistance heating. After reaching a specific temperature, a phase change and contraction occur, generating a strong restoring force. The memory alloy wire 4 pushes the slider 12 to move axially, while compressing the anti-impact spring 13. After the slider 12 moves a certain distance, the locking ball 11 enters the receiving groove 1203 of the slider 12 under the pressure of the pin shaft 1, thereby losing the locking effect on the pin shaft 1. The pin shaft 1 that loses its constraint retracts under the action of the pin pulling spring 5, realizing the pin pulling action.

[0089] After the pin puller of the present invention has completed the pin pulling action, if it needs to be used again, the pin shaft 1 can be pulled out to the position of the locked state by using a reset tool, and then manually reset.

[0090] In summary, the present invention realizes a pressure-resistant and waterproof electric pin puller that can be used for locking and separating underwater equipment. The axial pin pulling force of the present invention can reach more than 350N, the pin pulling stroke can reach 15mm, the number of reusable times is more than 80 times, and the pressure-resistant depth reaches 300m.

[0091] The main technical effects of the pin puller described in the present invention are as follows:

[0092] First, the present invention improves the structure of the pin puller and adds sealing measures, so that the pin puller has pressure-resistant and waterproof functions and can be used for locking and separating underwater equipment.

[0093] Second, the present invention adopts a watertight plug as the power supply connection mode of the pin puller, which improves the power supply connection mode of the pin puller, so that the wire for supplying power to the SMA wire is also safe and reliable in an underwater environment, and the connection mode is simple. At the same time, the watertight plug is adopted as the power supply connection mode of the pin puller, so that the power supply of the pin puller is safe and reliable, and the power supply is connected by plugging and unplugging the plug and the socket, and the connection mode is simple and convenient.

[0094] Thirdly, the present invention improves the structure of the pin puller, so that the pin pulling force of the pin puller reaches more than 350N, the pin pulling stroke reaches 15mm, and the pin puller can be reused.

[0095] The invention adopts sealing rings for sealing at the end face matching and shaft hole matching of the pin puller, adopts a watertight plug for power supply connection, and adopts a pressure-resistant design in structure to achieve waterproof sealing performance of the pin puller. Combined with the improvement of unlocking and releasing methods, the pin puller has the advantages of low impact, no pollution, good sealing, reusability, large pin pulling force and pin pulling stroke.

[0096] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A reusable pressure-resistant and waterproof pin puller driven by an SMA wire, characterized in that: include: A pin shaft (1), a memory alloy wire (4), a pin pulling spring (5), a locking ball (11), a slider (12), an outer shell (6) and a mounting flange (2), wherein: The mounting flange (2) covers the outer shell (6) to form a closed space; The pin shaft (1) can slide up and down through the mounting flange (2) and then be inserted into the outer shell (6); The pin pulling spring (5) is arranged around the periphery of the pin shaft (1), and its lower end abuts against the lower end of the pin shaft (1); The slider (12) is sleeved on the periphery of the pin shaft (1), and the memory alloy wire (4) is connected to the slider (12) and can drive the slider (12) to slide along the axial direction of the pin shaft (1); In the locked state, the pin pulling spring (5) is compressed, and the locking ball (11) is locked in the locking groove (101) on the pin shaft (1), so that the pin shaft (1) cannot slide up and down; when release is required, the memory alloy wire (4) is energized and undergoes phase change and contraction, driving the slider (12) to move downward along the axial direction of the pin shaft (1), and the locking ball (11) slides into the receiving groove (1203) on the slider (12), thereby losing the axial locking effect on the pin shaft (1), and the pin pulling spring (5) recovers its deformation, driving the pin shaft (1) to retract into the outer shell (6), thereby realizing the pin pulling action.

2. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 1, characterized in that: The SMA wire-driven reusable pressure-resistant and waterproof pin puller also includes: An inner shell (7), the inner shell (7) is located inside the outer shell (6), and the inner shell (7) defines a housing space for the pin shaft (1) and the pin pulling spring (5).

3. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 1, characterized in that: The SMA wire-driven reusable pressure-resistant and waterproof pin puller also includes: A watertight socket (10) is electrically connected to the memory alloy wire (4), and the watertight socket (10) is capable of controlling the on / off state of the memory alloy wire (4).

4. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 3, characterized in that: The SMA wire-driven reusable pressure-resistant and waterproof pin puller also includes: A first sealing ring (301) provided at the connection between the mounting flange (2) and the outer shell (6); A second sealing ring (302) provided at the connection between the pin shaft (1) and the mounting flange (2); And a third sealing ring (303) arranged at the connection between the watertight socket (10) and the outer shell (6).

5. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 4, characterized in that: The mounting flange (2) is provided with a through hole for the pin shaft (1) to pass through, and a limiting cylinder (201) is provided at the lower side of the through hole. The limiting cylinder (201) is sleeved on the periphery of the pin shaft (1), and the inner diameter of the limiting cylinder (201) is equal to the outer diameter of the pin shaft (1); The second sealing ring (302) is located at the connection between the limiting cylinder (201) and the pin shaft (1); A limiting hole (202) is provided on the limiting cylinder (201); in a locked state, the locking ball (11) is partially locked in the locking groove (101) and partially locked in the limiting hole (202); when unlocked, the locking ball (11) can pass through the limiting hole (202) and slide into the receiving groove (1203) on the sliding block (12).

6. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 2, characterized in that: The slider (12) comprises: A sleeve portion (1201) which is slidably sleeved on the periphery of the pin shaft (1), wherein in a locked state, the locking ball (11) is located between the locking groove (101) on the pin shaft (1) and the sleeve portion (1201); The connecting portion (1202) is used to be connected to one end of the memory alloy wire (4); the other end of the memory alloy wire (4) is connected to the lower end of the inner shell (7). The receiving groove (1203) is used to receive the locking ball (11) in the unlocked state.

7. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 6, characterized in that: The receiving groove (1203) is located on the upper side of the sleeve portion (1201), and the receiving groove (1203) is an annular cylindrical structure with an inner diameter greater than that of the sleeve portion (1201). The distance between the receiving groove (1203) and the pin shaft (1) is greater than or equal to the diameter of the locking ball (11).

8. The SMA wire driven reusable pressure-resistant and waterproof pin puller according to claim 2, characterized in that: The SMA wire-driven reusable pressure-resistant and waterproof pin puller also includes: A buffer pad (8) and a bottom plate (9), wherein the bottom plate (9) is connected to the lower end of the inner shell (7) to form the bottom surface of the inner shell (7), and the buffer pad (8) is arranged on the upper side of the bottom plate (9).

9. The reusable pressure-resistant and waterproof pin puller driven by SMA wire according to claim 1, characterized in that: The SMA wire-driven reusable pressure-resistant and waterproof pin puller also includes: A gasket (14) is sleeved on the periphery of the pin shaft (1), and the gasket (14) is located on the inner side of the pin pulling spring (5); An anti-impact spring (13) located outside the pin shaft (1); The upper end of the anti-impact spring (13) abuts against the lower end of the sleeve portion (1201) in the slider (12), and the lower end of the anti-impact spring (13) abuts against the lower end of the pin shaft (1).

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