Hot melt alloy puller

Abstract

The application discloses a hot melting alloy pin puller and belongs to the technical field of fuze safety mechanisms. The hot melting alloy pin puller comprises a first shell, a first limiting piece, a first elastic piece, a pin pulling assembly and a heating sheet. The first limiting piece is made of a hot melting alloy material. The pin pulling assembly comprises a second shell, a pin, a second elastic piece and a second limiting piece. The second shell is provided with a limiting hole. The second limiting piece is arranged in the limiting hole. One end of the pin can protrude from the second shell, and the other end of the pin is arranged in the second shell and abuts against the second limiting piece. One end of the second elastic piece abuts against the second shell, and the other end of the second elastic piece abuts against the pin. The first shell is connected with the heating sheet, and the first limiting piece is arranged correspondingly to the heating sheet. The end, away from the pin, of the pin pulling assembly abuts against the first limiting piece. One end of the first elastic piece abuts against the first shell, and the other end of the first elastic piece abuts against the second shell. The hot melting alloy pin puller improves the pin stroke and the overall driving force of the device through the arrangement of the two elastic pieces, so that the overall pin pulling is fast and efficient.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuze safety mechanism, and particularly relates to a hot-melt alloy pin puller. BACKGROUND

[0002] Actuators are widely used in fuze safety mechanisms, and with the increasing requirements for the safety of fuzes, more requirements are put forward for the performance of actuators, so that the actuators are continuously developed in the direction of miniaturization and large stroke. Traditional actuators include powder actuators and electromagnetic actuators, but each of the above actuators has advantages and disadvantages and is difficult to meet the needs of various occasions.

[0003] In recent years, hot-melt alloy actuators are widely used, that is, a limiting body made of hot-melt alloy material is used as a constraint to limit the movement of a pin, and when the limiting body is melted by heat, it changes from a solid to a liquid, thereby releasing the constraint on the pin, and the pin pushes the limiting body in a liquid state to the surrounding under the action of spring thrust, so that the pin realizes the movement of pushing or pulling.

[0004] However, the current hot-melt alloy pin puller has some defects, such as the stroke of the pin puller is generally the height of the limiting body, so the stroke is short, and if the height of the limiting body is increased, the limiting body is not easy to melt, which affects the performance of the actuator. Therefore, how to improve the stroke of the hot-melt alloy actuator is a problem to be solved in the technical field. In order to solve this problem, there are some large-stroke actuators driven by hot-melt alloy at present, but the volume is large, which is not suitable for the requirement of small size of the fuze safety mechanism.

[0005] In addition, the output force of the hot-melt alloy actuator is generally small, and the resistance of the spring is generally small. If the resistance of the spring is large, the hot-melt alloy block will be subjected to pressure for a long time, and the hot-melt alloy block in a solid state is generally soft, and it will always exist in the phenomenon of slow creep under a large positive pressure for a long time, which seriously affects the performance of the actuator. Therefore, the output force of the hot-melt alloy pin puller is generally small. SUMMARY

[0006] In view of one or more of the above defects or improvement needs of the prior art, the application provides a hot-melt alloy pin puller, which improves the stroke of the hot-melt alloy pin puller by improving the pin in the traditional hot-melt alloy pin puller, and improves the driving force.

[0007] To achieve the above purpose, the application provides a hot-melt alloy pin puller, which comprises a first shell, a first limiting piece, a first elastic piece, a pin pulling assembly and a heating sheet; the first limiting piece is made of hot-melt alloy material;

[0008] The pin pulling assembly comprises a second shell, a pin, a second elastic member and a second limiting member; the second shell is provided with a limiting hole, and the second limiting member is arranged in the limiting hole; one end of the pin can extend out of the second shell, and the other end of the pin is located in the second shell and can abut against the second limiting member; one end of the second elastic member abuts against the second shell, and the other end of the second elastic member abuts against the pin; when the second limiting member releases the limitation on the pin, the second elastic member can push the pin to move in a direction away from the end of the pin extending out of the second shell.

[0009] The first shell is connected with the heating sheet, the first limiting member is arranged corresponding to the heating sheet, and the pin pulling assembly abuts against the first limiting member away from the end provided with the pin; one end of the first elastic member abuts against the first shell, and the other end of the first elastic member abuts against the second shell; when the first limiting member releases the limitation on the pin pulling assembly, the first elastic member can push the pin pulling assembly to move in a direction away from the end provided with the pin.

[0010] As a further improvement of the present application, the second limiting member is a spherical body.

[0011] As a further improvement of the present application, the surface of the pin abutting against the second limiting member is a bevel surface.

[0012] As a further improvement of the present application, the pin comprises a first limiting part, the length of the first limiting part is greater than the length of other parts of the pin, the second elastic member abuts against one side of the first limiting part, and the second limiting member abuts against the other side of the first limiting part.

[0013] As a further improvement of the present application, the pin pulling assembly further comprises a pressing screw, and the outer side of the second shell is provided with a thread corresponding to the pressing screw, so that the pressing screw is connected with the second shell in cooperation.

[0014] As a further improvement of the present application, the pressing screw is connected with the end of the pin extending out of the second shell in the second shell.

[0015] As a further improvement of the present application, the second shell comprises a second limiting part, the length of the second limiting part is greater than the length of other parts of the second shell, and one end of the first elastic member abuts against the second limiting part.

[0016] As a further improvement of the present application, the second shell comprises a containing cavity for containing the pin, the second limiting member and the second elastic member, and the limiting hole is communicated with the containing cavity.

[0017] As a further improvement of the present application, the first shell is provided with a blind hole, so that the first limiting member can flow out of the blind hole when it is melted into a liquid.

[0018] As a further improvement of the present application, the first shell comprises a base, an upper cover and a connecting piece, the base and the upper cover are connected through the connecting piece.

[0019] The above technical features can be combined with each other as long as they do not conflict with each other.

[0020] Overall, compared with the prior art, the above technical solutions conceived by the present application have the following beneficial effects:

[0021] (1) The hot melting alloy pin puller in the present application, by setting two elastic members, the overall movement stroke of the pin is the movement stroke of the pin puller assembly pushed downward by the first elastic member plus the stroke of the pin pushed downward by the second elastic member, compared with the stroke of the pin puller assembly pushed downward alone, the stroke is greatly improved. Moreover, the conventional pin puller is provided with only one driving member, and the driving force is small, after movement, with the continuous elongation of the spring, the resistance is continuously reduced, while the driving force of the present application is provided by two elastic members, and the driving force is also greatly improved.

[0022] (2) The hot melting alloy pin puller of the present application, by setting the second limiting member in cooperation with the second elastic member, the second elastic member can provide driving force during the pin pulling process, and the second limiting member makes the overall pin pulling process stable and reliable, and can ensure that the pin pulling process is not unexpected while quickly pulling out the pin.

[0023] (3) The hot melting alloy pin puller of the present application, by setting two elastic members to improve the stroke of the pin and the overall driving force of the device, the overall pin pulling of the device is fast, efficient, and stable and reliable in use process, and has good application prospect and use value. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 is the initial state diagram of the overall structure of the hot melting alloy pin puller in the embodiment of the present application;

[0026] Figure 2 is the overall structure of the hot melting alloy pin puller in the embodiment of the present application;

[0027] Figure 3 is the pin puller assembly diagram of the hot melting alloy pin puller in the embodiment of the present application;

[0028] Figure 4 Figure 1 is a schematic view of a base of a hot melt alloy pin puller according to an embodiment of the present application;

[0029] In all the drawings, the same reference signs refer to the same technical features, specifically:

[0030] 1, first housing; 2, first limiting piece; 3, first elastic piece; 4, pin pulling assembly; 5, heating sheet;

[0031] 101, base; 102, upper cover; 103, connecting piece; 1011, blind hole;

[0032] 401, second housing; 402, pin; 403, second elastic piece; 404, second limiting piece; 405, pressing screw; 4011, second limiting part; 4012, accommodating cavity; 4021, first limiting part. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements 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.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0036] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "fixed", and the like, should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless specifically defined otherwise. 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.

[0037] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] Embodiment:

[0039] Please refer to Figures 1-4 The hot melting alloy pin puller in the preferred embodiment of the present application comprises a first shell 1, a first limiting piece 2, a first elastic piece 3, a pin pulling assembly 4 and a heating sheet 5. The first limiting piece 2 is preferably a cylindrical object and is made of hot melting alloy material. The specific preferred chemical composition is Wood's alloy with 50% Bi, 25% Pb, 12.5% Sn and 12.5% Cd (melting point 72℃), or fusible alloy with 52% Bi, 32% Pb and 16% Sn (melting point 96℃), which is convenient for pin pulling.

[0040] Further, as Figure 3 shown, the pin pulling assembly 4 in the preferred embodiment comprises a second shell 401, a pin 402, a second elastic piece 403, a second limiting piece 404 and a pressing screw 405. The second shell 401 is provided with a limiting hole, and the second limiting piece 404 is arranged in the limiting hole. Preferably, the second limiting piece 404 stays in the limiting hole under the action of external force. One end of the pin 402 can extend out of the second shell 401, and the other end is located in the second shell 401 and can abut against the second limiting piece 404. Specifically, the second shell 401 in the preferred embodiment comprises a containing cavity 4012 for containing the pin 402, the second limiting piece 404 and the second elastic piece 403. The pin 402, the second limiting piece 404 and the second elastic piece 403 can move in the containing cavity 4012, and the limiting hole is in communication with the containing cavity 4012.

[0041] Specifically, one end of the second elastic member 403 abuts against the second housing 401, and the other end abuts against the pin 402. When the second limiting member 404 releases the limiting of the pin 402, the second elastic member 403 can push the pin 402 to move in a direction away from the end of the pin 402 protruding from the second housing 401, so that the pin 402 is pulled out. In the preferred embodiment, the second elastic member 403 is a spring in a compressed state in the initial state, which provides driving force in the pin pulling assembly 4, and is preferably sleeved on the outer periphery of the pin 402.

[0042] In addition, in the preferred embodiment, the second housing 401 is provided with threads outside corresponding to the pressing screw 405, so that the pressing screw 405 can be connected with the second housing 401. Preferably, the pressing screw 405 is connected to the end of the second housing 401 where the pin 402 can protrude, i.e. the upper end of the second housing 401. When the second elastic member 403 protrudes out of the second housing 401, one end of the second elastic member 403 abuts against the pressing screw 405, and the other end abuts against the pin 402. This arrangement makes the pin pulling process safer and more reliable.

[0043] In the preferred embodiment, the second limiting member 404 is a ball, which can be a steel ball. More preferably, the surface of the pin 402 abutting against the second limiting member 404 is provided with a slope corresponding to the second limiting member 404, i.e. the contact surface is tangent to the second limiting member 404 and is not perpendicular to the horizontal direction and the vertical direction, which can decompose the driving force of the second elastic member 403 in the vertical direction into a horizontal pushing force to push the second limiting member 404 to move laterally. In the initial state, the part of the second limiting member 404 protruding into the accommodating cavity 4012 is 1 / 4 to 1 / 3 of the diameter of the second limiting member 404.

[0044] More specifically, in the preferred embodiment, the pin 402 includes a first limiting portion 4021, the length of the first limiting portion 4021 is greater than the length of other parts of the pin 402, the second elastic member 403 abuts against one side of the first limiting portion 4021, and the second limiting member 404 abuts against the other side of the first limiting portion 4021. In specific implementation, the pin 402 is cylindrical, the first limiting portion 4021 is a slightly larger diameter cylinder, the transition section of the part of the first limiting portion 4021 contacting the second elastic member 403 is a planar cylindrical shape, which can limit the second elastic member 403. The transition section of the part of the first limiting portion 4021 contacting the second limiting member 404 is a conical surface, which can decompose the vertical elastic force of the second elastic member 403 into a horizontal pushing force. The pin 402 also has a part of the cylinder below the first limiting portion 4021, which can constrain the second limiting member 404 to a certain extent.

[0045] In detail, the first shell 1 is connected with the heating sheet 5 in the preferred embodiment, the first limiting member 2 is arranged correspondingly to the heating sheet 5, and the pin pulling assembly 4 is abutted against the first limiting member 2 at the end away from the pin 402. In the specific implementation, the heating sheet 5 is an electric heating sheet, which is externally connected with a wire, and the first limiting member 2 is preferably arranged above the heating sheet 5. When the heating sheet 5 receives external power supply through the wire, the heating sheet 5 emits heat, which provides heat for the melting of the first limiting member 2 above the heating sheet 5.

[0046] In more detail, one end of the first elastic member 3 is abutted against the first shell 1 and the other end is abutted against the second shell 401 in the preferred embodiment. When the first limiting member 2 releases the limiting of the pin pulling assembly 4, the first elastic member 3 can push the pin pulling assembly 4 to move away from the pin 402, thereby realizing the pulling of the pin.

[0047] In the preferred embodiment, the second shell 401 includes a second limiting part 4011, the length of the second limiting part 4011 is greater than the length of other parts of the second shell 401, and one end of the first elastic member 3 is abutted against the second limiting part 4011. In the specific implementation, the first elastic member 3 is a balance spring, which is in a compressed state in the initial state, as shown in Figure 1

[0048] In addition, the first shell 1 can be integrally formed or separately formed in the preferred embodiment. When the first shell 1 is separately formed, it can include a base 101, an upper cover 102 and a connecting piece 103. The base 101 and the upper cover 102 are connected through the connecting piece 103. In the specific implementation, the connecting piece 103 can be selected as a bolt, and the base 101 and the upper cover 102 are correspondingly provided with bolt holes to realize the connection. The upper cover 102 is correspondingly provided with the first limiting member 2, the first elastic member 3 and the pin pulling assembly 4, and is sequentially provided with a small hole, a middle hole and a large hole from top to bottom. The small hole is used to accommodate the up-and-down movement of the pin 402, the middle hole is used to limit the second limiting member 404 in the initial installation state, preventing the second limiting member 404 from being squeezed out by the pin 402 and accidentally releasing the locking of the pin 402, and the large hole is used to accommodate the first elastic member 3 and provide an accommodation space for the release of the constraint of the second limiting member 404 when the pin pulling assembly 4 moves downward. The outer part of the upper cover 102 is composed of a cylinder and a flange.

[0049] In the preferred embodiment, the first shell 1 is provided with a blind hole 1011, as shown in Figure 4 ​As shown, the blind hole 1011 is preferably arranged on the base 101. Since the first limiting member 2 is preferably connected to the base 101, the base 101 can be formed of a cylinder and a flange plate, and the first limiting member 2 is arranged in the cylinder, so that displacement of the first limiting member 2 during use can be avoided. The blind hole 1011 is arranged on the cylinder, so that the first limiting member 2 can flow out of the blind hole 1011 when it melts into liquid, and the limiting on the pin pulling assembly 4 is released. After the first limiting member 2 melts and flows away, the bottom of the second shell 401 with the same diameter as the first limiting member 2 enters the cylinder under the action of gravity, so that the pin pulling process is stable and reliable.

[0050] The use process of the hot melting alloy pin puller is as follows: first, the device is installed. When the second limiting member 404 is installed, the pin 402 needs to be lifted upward so that the pin 402 does not contact the second limiting member 404, and then the second limiting member 404 is inserted into the limiting hole. In this way, the second limiting member 404 will not be squeezed out, and the second limiting member 404 will not fall into the accommodating cavity 4012 of the second shell 401 due to the limiting of the lower cylinder of the pin 402. After the outside of the second limiting member 404 is constrained, the external force applied to the pin 402 is removed, and the pin 402 is pressed against the second limiting member 404 under the pushing force of the second elastic member 403 to provide a pushing force on the pin 402. The initial state after installation is as shown in Figure 1 When the pin needs to be pulled, the heating sheet 5 is heated, the first elastic member 3 pushes the second shell 401 to drive the pin pulling assembly 4 to move downward as a whole, and after moving downward to a certain extent, the second limiting member 404 releases the limiting on the pin 402, and the second elastic member 403 drives the pin 402 to move downward, and the pin pulling is completed. The in-place state is as shown in Figure 2

[0051] The hot melting alloy pin puller in the application has two elastic members, so that the overall movement stroke of the pin is the movement stroke of the pin pulling assembly pushed downward by the first elastic member plus the movement stroke of the pin pushed downward by the second elastic member, which is greatly improved compared with the movement stroke of the pin pulling assembly pushed downward alone. In addition, a conventional pin puller is provided with only one balance spring, and the driving force is small. After movement, the resistance of the balance spring decreases continuously with the continuous elongation of the balance spring. However, the driving force of the application is provided by two elastic members, and the driving force is also greatly improved.

[0052] Those skilled in the art will readily understand that the above description is only preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.​

Claims

1. A hot melt alloy pin puller characterized by, It includes a first housing, a first limiting member, a first elastic member, a pull-out pin assembly, and a heating element; the first limiting member is made of a hot-melt alloy material; The pin-pulling assembly includes a second housing, a pin, a second elastic element, and a second limiting element. The second housing has a limiting hole, and the second limiting element is placed in the limiting hole. One end of the pin can extend out of the second housing, and the other end is located inside the second housing and can abut against the second limiting element. One end of the second elastic element abuts against the second housing, and the other end abuts against the pin. The second elastic element is in a compressed state in the initial state. When the second limiting element releases its restriction on the pin, the second elastic element can push the pin to move in a direction away from the end of the pin that protrudes from the second housing. The heating element is connected to the first housing, and the first limiting member is provided corresponding to the heating element. The end of the pin-pulling assembly opposite to the pin is abutted against the first limiting member. One end of the first elastic member abuts against the first housing, and the other end abuts against the second housing. The first elastic member is in a compressed state in the initial state. The heating element can provide heat to the first limiting member, causing the first limiting member to melt into a liquid. When the first limiting member releases its restriction on the pin-pulling assembly, the first elastic member can push the pin-pulling assembly to move in the direction opposite to the pin. The second limiting member is a sphere, and the surface of the pin that abuts against the second limiting member is an inclined surface.

2. The hot melt alloy puller pin according to claim 1, wherein, The pin includes a first limiting part, the length of which is greater than the length of other parts of the pin. The second elastic member abuts against one side of the first limiting part and the second limiting member abuts against the other side of the first limiting part.

3. The hot melt alloy puller pin according to claim 1, wherein, The pin-pulling assembly also includes a pressure screw, and the outer side of the second housing is provided with a thread corresponding to the pressure screw, so that the pressure screw and the second housing are connected in a mating manner.

4. The hot melt alloy puller pin according to claim 3, wherein, The pressure screw is connected to the second housing, and the pin can extend out of one end of the second housing.

5. The hot melt alloy pin puller of any one of claims 1-4, wherein, The second housing includes a second limiting part, the length of which is greater than the length of other parts of the second housing, and one end of the first elastic member abuts against the second limiting part.

6. The hot melt alloy pin puller of any one of claims 1-4, wherein, The second housing includes a receiving cavity for accommodating the pin, the second limiting member, and the second elastic member, and the limiting hole communicates with the receiving cavity.

7. The hot melt alloy pin puller of any one of claims 1-4, wherein, The first housing is provided with a blind hole, so that the first limiting member can flow out from the blind hole when it melts into a liquid.

8. The hot melt alloy pin puller of any one of claims 1-4, wherein, The first housing includes a base, a top cover, and a connector, wherein the base and the top cover are connected by the connector.

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