A board spacing floating connector structure for connecting printed boards

Abstract

The utility model discloses a board spacing floating connector structure for connecting printed circuit boards, comprising a first pin mounting block and a second pin mounting block located directly above the first pin mounting block, wherein the first pin mounting block and the second pin mounting block adopt an up-and-down floating connection assembly to realize up-and-down floating connection; the first pin mounting block is equipped with a plurality of first pins pointing vertically downward, and the second pin mounting block is equipped with a plurality of second pins pointing vertically upward, and the first pins and the second pins are connected through a flexible wire. The utility model can realize the requirements of a board spacing floating connector for a fixed-end printed circuit board, realize reliable interconnection of electrical circuits, and improve the environmental applicability of the product.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit connection, and in particular relates to a board spacing floating connector structure used for connecting printed boards. Background Art

[0002] With the rapid development of high-tech fields such as aviation, aerospace, weapons, radar, etc., the performance requirements for connectors are also constantly increasing. Connectors in these fields not only need to meet the basic reliable interconnection function of electrical circuits, but also need to have high density, light weight, miniaturization and other characteristics to adapt to the compact layout of the internal space of the equipment. At the same time, due to the complex and changeable working environment, connectors must also have the ability to float the spacing between printed circuit boards, airtightness, easy disassembly, high temperature resistance, strong vibration and impact resistance.

[0003] In the existing board-to-board connector applications, although the connectors meet the basic electrical connection requirements to a certain extent, there are still some significant defects in practical applications. Traditional board-to-board connectors are usually connected by welding pins to PCB board holes, and the distance between the boards is fixed. This connection method has a large cumulative tolerance during the processing and assembly process, which often causes over-positioning or over-pressure after assembly, thereby damaging the connector interface and even causing the pin solder joints to loosen. In this case, the electrical signal transmission may be interrupted, and in severe cases, it may cause damage to the PCB board or integrated circuit, which in turn causes system signal data transmission failure. Summary of the invention

[0004] In view of the problems existing in the prior art, the utility model provides a board spacing floating connector structure for connecting printed boards, which can meet the requirements of the board spacing floating connector of the fixed-end printed board and realize the reliable interconnection of electrical circuits to improve the environmental applicability of the product.

[0005] In order to solve the above technical problems, the utility model is implemented through the following technical solutions:

[0006] A board spacing floating connector structure for connecting printed circuit boards, comprising a first pin mounting block and a second pin mounting block located directly above the first pin mounting block, wherein the first pin mounting block and the second pin mounting block adopt an up and down floating connection component to achieve an up and down floating connection; the first pin mounting block is provided with a plurality of first pins pointing vertically downward, the second pin mounting block is provided with a plurality of second pins pointing vertically upward, and the first pins and the second pins are connected via a flexible wire.

[0007] Furthermore, the up and down floating connection assembly includes a first support block, a second support block, a third support block and a fourth support block, the first support block is connected to a position close to one end of one side of the first pin mounting block, the second support block is connected to a position close to the other end of the other side of the first pin mounting block, the third support block and the fourth support block are respectively connected to both sides of the second pin mounting block, and the third support block is arranged opposite to the first support block, and the fourth support block is arranged opposite to the second support block; the upper surfaces of the first support block and the second support block are both connected with threaded sleeves, and the third support block and the fourth support block are both penetrated by first bolts threadedly connected to the corresponding threaded sleeves, and each of the first bolts is sleeved with an elastic member, the upper end of the elastic member abuts against the corresponding third support block or the fourth support block, and the lower end of the elastic member abuts against the corresponding threaded sleeve.

[0008] Furthermore, the lower surfaces of the third support block and the fourth support block are provided with limited stepped holes, and the upper ends of the elastic members are pressed against the corresponding limited stepped holes.

[0009] Furthermore, the first support block and the second support block are both penetrated by a second bolt threadedly connected to the corresponding threaded sleeve.

[0010] Furthermore, a washer is provided between the second bolt and the lower surface of the corresponding first supporting block or the second supporting block.

[0011] Furthermore, the gasket includes a flat gasket, a spring gasket or a combination of the two.

[0012] Furthermore, the elastic member is a spring.

[0013] Furthermore, guide column mounting blocks are respectively arranged on both sides of the second pin mounting block, and guide columns are arranged on the guide column mounting blocks.

[0014] Compared with the prior art, the utility model has at least the following beneficial effects:

[0015] The utility model provides a board spacing floating connector structure for connecting printed boards, wherein the first pin and the second pin on the first pin mounting block and the second pin mounting block are respectively electrically connected to the corresponding printed boards. Because the first pin mounting block and the second pin mounting block are connected by an up-and-down floating connection assembly, the first pin mounting block and the second pin mounting block can be relatively floated in the vertical direction, and the connection between printed boards with different board spacings can be achieved. When the spacing between the printed boards changes, the first pin mounting block and the second pin mounting block will float relatively under the action of the up-and-down floating connection assembly to adapt to the change in spacing. Since the first pin and the second pin are connected by a flexible wire, the electrical connection between the pins will not be interrupted due to the change in spacing, thereby ensuring the stability and reliability of the circuit, being able to meet the requirements of the fixed-end printed board spacing floating connector, and realizing reliable interconnection of electrical circuits to improve the environmental applicability of the product.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is an axonometric diagram of a board spacing floating connector structure for connecting printed boards according to an embodiment of the utility model;

[0019] Figure 2 This is a plan view of a board spacing floating connector structure for connecting printed boards according to an embodiment of the utility model, wherein (a) is a front view, (b) is a right view, and (c) is a top view;

[0020] Figure 3 This is a plan view of a board spacing floating connector structure for connecting printed boards in an embodiment of the utility model when in use, wherein (a) is the main view and (b) is the right view.

[0021] In the figure: 1-first pin mounting block; 2-second pin mounting block; 3-first pin; 4-second pin; 5-flexible wire; 6-up and down floating connection assembly; 61-first support block; 62-second support block; 63-third support block; 64-fourth support block; 65-threaded sleeve; 66-first bolt; 67-elastic member; 68-second bolt; 7-guide column mounting block; 8-guide column; 9-washer; 10-first printed circuit board; 11-second printed circuit board. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a board spacing floating connector structure for connecting printed circuit boards, including a first pin mounting block 1 and a second pin mounting block 2 located directly above the first pin mounting block 1, the first pin mounting block 1 and the second pin mounting block 2 adopt an up and down floating connection component 6 to achieve an up and down floating connection; the first pin mounting block 1 is provided with a plurality of first pins 3 pointing vertically downward, the second pin mounting block 2 is provided with a plurality of second pins 4 pointing vertically upward, and the first pin 3 and the second pin 4 are connected via a flexible wire 5.

[0024] Specifically, the board spacing floating connector structure in this embodiment mainly includes: a first pin mounting block 1, a second pin mounting block 2, an up-down floating connection component 6, a first pin 3, a second pin 4 and a flexible wire 5. The first pin mounting block 1 serves as the bottom support of the connector structure, and its design has sufficient strength and stability to carry and fix the first pin 3. The second pin mounting block 2 is located directly above the first pin mounting block 1, and is used to carry and fix the second pin 4. The up-down floating connection component 6 connects the first pin mounting block 1 and the second pin mounting block 2, and allows the two to float relative to each other in the vertical direction. The first pin 3 is installed vertically downward on the first pin mounting block 1, and its number and arrangement are determined according to the circuit connection requirements. The second pin 4 is installed vertically upward on the second pin mounting block 2, corresponding to the first pin 3, and is used to be electrically connected to the first pin 3. The flexible wire 5 connects the first pin 3 and the second pin 4 to ensure the transmission of electrical signals between the two.

[0025] In this embodiment, when in use, the first pin 3 and the second pin 4 on the first pin mounting block 1 and the second pin mounting block 2 are electrically connected to the corresponding printed circuit boards respectively. Because the first pin mounting block 1 and the second pin mounting block 2 are connected by an up-and-down floating connection component 6, the first pin mounting block 1 and the second pin mounting block 2 can be relatively floated in the vertical direction, and the connection between printed circuits with different board spacings can be achieved. When the spacing between the printed circuits changes, the first pin mounting block 1 and the second pin mounting block 2 will float relatively under the action of the up-and-down floating connection component 6 to adapt to the change in spacing. Since the first pin 3 and the second pin 4 are connected by a flexible wire 5, the electrical connection between the pins will not be interrupted due to the change in spacing, thereby ensuring the stability and reliability of the circuit, being able to meet the requirements of the floating connector of the fixed-end printed circuit board spacing, and realizing reliable interconnection of electrical circuits to improve the environmental applicability of the product. This structure effectively solves the problem of board spacing changes caused by assembly errors, thermal expansion and other factors. This structure has the advantages of simple structure, easy assembly and reliable use. It can be widely used in applications where floating interconnection is required between printed boards.

[0026] In one achievable manner, the up and down floating connection assembly 6 includes a first support block 61, a second support block 62, a third support block 63 and a fourth support block 64, the first support block 61 is connected to a position near one end of one side of the first pin mounting block 1, the second support block 62 is connected to a position near the other end of the other side of the first pin mounting block 1, the third support block 63 and the fourth support block 64 are respectively connected to both sides of the second pin mounting block 2, and the third support block 63 is arranged opposite to the first support block 61, and the fourth support block 64 is arranged opposite to the second support block 62; the upper surfaces of the first support block 61 and the second support block 62 are both connected with a threaded sleeve 65, and the third support block 63 and the fourth support block 64 are both penetrated by a first bolt 66 threadedly connected to the corresponding threaded sleeve 65, and each first bolt 66 is sleeved with an elastic member 67, the upper end of the elastic member 67 abuts against the corresponding third support block 63 or the fourth support block 64, and the lower end of the elastic member 67 abuts against the corresponding threaded sleeve 65.

[0027] Specifically, the up and down floating connection component 6 is the core part of the connector structure, and its design is intended to achieve an up and down floating connection between the first pin mounting block 1 and the second pin mounting block 2. The component mainly includes a first support block 61, a second support block 62, a third support block 63, a fourth support block 64, a threaded sleeve 65, a first bolt 66 and an elastic member 67. The first support block 61 and the second support block 62 are respectively connected to the two sides of the first pin mounting block 1, close to the positions of both ends thereof. They provide stable support points for the up and down floating connection. The third support block 63 and the fourth support block 64 are connected to the two sides of the second pin mounting block 2, and are respectively arranged opposite to the first support block 61 and the second support block 62. They form an up and down floating structural frame together with the first support block and the second support block. The threaded sleeve 65 is respectively connected to the upper surface of the first support block 61 and the second support block 62, and is used for threaded connection with the first bolt 66. The first bolt 66 passes through the third support block 63 and the fourth support block 64, respectively, and is threadedly connected with the corresponding threaded sleeve 65. By rotating the first bolt 66, the relative position between the first bolt 66 and the threaded sleeve 65 can be adjusted, thereby adjusting the spacing between the first pin mounting block 1 and the second pin mounting block 2. The elastic member 67 is sleeved on each first bolt 66, with its upper end abutting against the corresponding third support block 63 or fourth support block 64, and its lower end abutting against the corresponding threaded sleeve 65. The elastic member 67 provides the necessary elastic support for the up and down floating connection, ensuring that when the spacing between the printed circuit boards changes, the first pin 3 and the second pin 4 can always maintain a stable electrical connection.

[0028] When the spacing between the printed circuit boards changes, the first pin mounting block 1 and the second pin mounting block 2 can float relative to each other in the vertical direction due to the threaded connection between the first bolt 66 and the threaded sleeve 65 and the elastic effect of the elastic member 67. This floating connection method can ensure that the first pin 3 and the second pin 4 always maintain a stable electrical connection, thereby ensuring the stability and reliability of the circuit.

[0029] Preferably, limited stepped holes are provided on the lower surfaces of the third support block 63 and the fourth support block 64, and the upper end of the elastic member 67 abuts against the corresponding limited stepped holes. In other words, the lower surfaces of the third support block and the fourth support block are improved, and limited stepped holes are provided to better fix and support the elastic member. On the basis of the original board spacing floating connector structure, limited stepped holes are additionally provided on the lower surfaces of the third support block 63 and the fourth support block 64. These stepped holes are designed to more stably support and fix the elastic member 67 to ensure that it does not shift or fall off during operation. The shape and size of these stepped holes match the elastic member 67, so that the upper end of the elastic member 67 can stably abut against the stepped hole.

[0030] When the spacing between the printed circuit boards changes, the first pin mounting block 1 and the second pin mounting block 2 can float relative to each other in the vertical direction due to the threaded connection between the first bolt 66 and the threaded sleeve 65 and the elastic effect of the elastic member 67. The design of the position-limiting stepped hole ensures that the elastic member 67 always stably rests in the stepped hole during the floating process without displacement or falling off, thereby further enhancing the stability and reliability of the connector structure.

[0031] Preferably, a spring is used as an elastic member 67, which is sleeved on each first bolt 66, with its upper end abutting on the corresponding third support block 63 or fourth support block 64, and its lower end abutting on the corresponding threaded sleeve 65. The selection of the spring provides a good elastic floating ability for the connector structure, ensuring that when the spacing of the printed circuit board changes, the first pin mounting block 1 and the second pin mounting block 2 can float relatively while maintaining a stable electrical connection. The selection of the spring not only ensures the elastic floating ability of the connector structure, but also provides good stability and durability.

[0032] In one embodiment, second bolts 68 threadedly connected to corresponding threaded sleeves 65 are provided through the first support block 61 and the second support block 62. The second bolts 68 can be directly used to pass through the mounting holes on the printed circuit board to fix the printed circuit board on the first pin mounting block 1.

[0033] Preferably, a washer 9 is provided between the second bolt 68 and the lower surface of the corresponding first support block 61 or second support block 62. The washer 9 is located between the second bolt 68 and the lower surface of the first support block 61 or second support block 62, and its function is to increase the contact area, reduce the pressure distribution, and prevent wear or damage caused by direct contact between the bolt and the support block. At the same time, the washer 9 can also play a role in shock absorption and buffering, further improving the stability and reliability of the connector structure.

[0034] Preferably, the washer 9 includes a flat washer, a spring washer or a combination of the two. The flat washer is a simple metal washer used to increase the contact area between the bolt and the support block, reduce the pressure per unit area, and thus prevent wear between the bolt and the support block. The spring washer has a certain elasticity and can provide a certain preload after the bolt is tightened, thereby enhancing the stability and reliability of the connection. At the same time, the spring washer can also play a role in shock absorption and buffering. In some cases, in order to meet the requirements of increasing the contact area and providing the preload at the same time, a combination of a flat washer and a spring washer can be used, first placing the flat washer to increase the contact area, and then placing the spring washer to provide the preload.

[0035] In one achievable manner, guide post mounting blocks 7 are respectively provided on both sides of the second pin mounting block 2, and guide posts 8 are provided on the guide post mounting blocks 7. This design is intended to provide additional guiding and positioning functions to ensure the stability and accuracy of the connector structure during floating and installation with the printed circuit board. The guide post mounting blocks 7 are structural members fixed on both sides of the second pin mounting block 2, used to install and fix the guide posts 8, and their design should ensure that the guide posts 8 can be stably and accurately installed on the mounting blocks, and can provide sufficient support and guiding functions when needed. The guide posts 8 are installed on the guide post mounting blocks 7, and their function is to provide additional guiding and positioning functions. When the printed circuit board is matched with the second pin on the second pin mounting block, the guide posts 8 can be used to quickly match and position with the guide holes on the printed circuit board. At the same time, when the first pin mounting block 1 and the second pin mounting block 2 float relative to each other in the vertical direction, the guide posts 8 can ensure that the relative position between the two remains stable at all times to prevent displacement or misalignment. It should be noted that the installation position of the guide posts 8 is determined according to the printed circuit board to be assembled.

[0036] In a specific implementation case, combined with Figure 3 As shown, in order to meet the requirements of different board spacing, the floating connector structure adopts a two-body linkage structure. Specifically, the second pin mounting block at the upper end uses a socket structure with an interface, and the first pin mounting block at the lower end adopts a direct-insertion printed circuit board pin sealing structure. The electrical performance between the two structures is achieved through the crimping connection of pins and flexible wires to achieve stable signal transmission. When the two module boards are interconnected, the guide pillars and the guide holes on the printed circuit board are used to guide and straighten the connector to avoid damage to the connector due to blind insertion between the boards. After assembly, the spring at the socket end is in the longest state due to the elastic effect. When designing, it is considered that the spring force value is greater than the insertion force between the plug and the socket. At this time, the distance between the printed circuit boards is the largest. When the distance between the two module boards needs to float, by controlling the distance between the boards, when the plug and the socket are plugged in, the end face of the plug shell squeezes the end face of the socket (i.e., the second pin mounting block), and the second pin mounting block compresses the spring to achieve floating board spacing; when the second pin mounting block compresses the socket shell, when the compression distance reaches the end face of the first bolt, the spring compression amount reaches the minimum safety value, and the distance between the two module boards is the smallest at this time; this floating structure can effectively solve the problem that the spacing between the printed boards cannot float. It improves the product's tolerance to harsh environments and high-level vibration and shock, and ensures reliable connection of electrical circuits. This product is a 31-core printed circuit board connector with a small structural size and small footprint. It can realize blind insertion between boards and floating connection between board spacing, and is easy and reliable to operate. It improves the environmental adaptability of the elastic floating connector and realizes reliable interconnection of electrical circuits between printed boards.

[0037] Combination Figure 3As shown, when assembling the product, the first pin of the first pin mounting block of the connector is passed through the pad hole of the first printed circuit board 10, and the second bolt, spring washer, and gasket are used to pass through the mounting hole together, and the locking and fixing are achieved through the connecting sleeve, and the pins are tinned and sealed to achieve reliable interconnection between the first pin mounting block and the first printed circuit board 10; the second pin mounting block uses the same method to achieve reliable interconnection between the connector plug and the second printed circuit board 11. The first printed circuit board 10 and the connector socket form a fixed module, and the second printed circuit board 11 and the plug form a fixed module. The two modules are guided and aligned with the guide pins, and the reliable interconnection of floating connectors with different board spacings is achieved through springs.

[0038] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly defined and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0043] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A board spacing floating connector structure for connecting printed boards, characterized in that: The invention comprises a first pin mounting block (1) and a second pin mounting block (2) located directly above the first pin mounting block (1); the first pin mounting block (1) and the second pin mounting block (2) are connected in an up-and-down floating manner by using an up-and-down floating connection assembly (6); a plurality of first pins (3) pointing vertically downward are mounted on the first pin mounting block (1); a plurality of second pins (4) pointing vertically upward are mounted on the second pin mounting block (2); the first pins (3) and the second pins (4) are connected via a flexible wire (5).

2. A board spacing floating connector structure for connecting printed boards according to claim 1, characterized in that: The up-and-down floating connection assembly (6) comprises a first support block (61), a second support block (62), a third support block (63) and a fourth support block (64), wherein the first support block (61) is connected to a position close to one end of one side of the first pin mounting block (1), the second support block (62) is connected to a position close to the other end of the other side of the first pin mounting block (1), the third support block (63) and the fourth support block (64) are respectively connected to two sides of the second pin mounting block (2), and the third support block (63) is arranged opposite to the first support block (61), and the fourth support block (64) is arranged opposite to the first support block (61). 4) is arranged opposite to the second support block (62); the upper surfaces of the first support block (61) and the second support block (62) are both connected with a threaded sleeve (65), and the third support block (63) and the fourth support block (64) are both penetrated with a first bolt (66) threadedly connected to the corresponding threaded sleeve (65), and each of the first bolts (66) is sleeved with an elastic member (67), the upper end of the elastic member (67) abuts against the corresponding third support block (63) or the fourth support block (64), and the lower end of the elastic member (67) abuts against the corresponding threaded sleeve (65).

3. A board spacing floating connector structure for connecting printed boards according to claim 2, characterized in that: Limiting stepped holes are provided on the lower surfaces of the third supporting block (63) and the fourth supporting block (64), and the upper ends of the elastic members (67) are pressed against the corresponding limiting stepped holes.

4. A board spacing floating connector structure for connecting printed boards according to claim 2, characterized in that: The first support block (61) and the second support block (62) are both provided with second bolts (68) threadedly connected to the corresponding threaded sleeves (65).

5. A board spacing floating connector structure for connecting printed boards according to claim 4, characterized in that: A washer (9) is provided between the second bolt (68) and the lower surface of the corresponding first support block (61) or the second support block (62).

6. A board spacing floating connector structure for connecting printed boards according to claim 5, characterized in that: The gasket (9) comprises a flat gasket, a spring gasket or a combination of the two.

7. A board spacing floating connector structure for connecting printed boards according to claim 2, characterized in that: The elastic member (67) is a spring.

8. A board spacing floating connector structure for connecting printed boards according to claim 1, characterized in that: Guide column mounting blocks (7) are respectively arranged on both sides of the second pin mounting block (2), and guide columns (8) are arranged on the guide column mounting blocks (7).

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