A structure for expanding a needle plate of a flat knitting machine

Abstract

The application relates to a structure for expanding a needle plate of a flat knitting machine, which comprises a plate body, the plate body comprises a front plate and a rear plate, the front plate and the rear plate are fixed to each other through connecting rods to form a needle plate structure with a triangular cross section, and detachable expansion plates are arranged at the two ends of the plate body in the length direction, detachable mounting assemblies are arranged between the expansion plates and the plate body, the expansion plates are detachably mounted on the plate body through the detachable mounting assemblies, the mounting assemblies comprise an insertion block, an insertion groove, a fixing block and a fixing groove, the insertion block is slidably arranged at one end of the plate body in the length direction, the insertion groove is arranged at one end of the expansion plate in the width direction, the insertion block is inserted into the insertion groove through sliding, the fixing block is slidably arranged on the side wall of the insertion block, the fixing groove is arranged on the side wall of the insertion groove, and the insertion block is inserted into the insertion groove or accommodated in the fixing block through sliding. The application has the effect that the yarn cutting structure of the knitting needle can be used when the needle plate is full of needles.

Description

Technical Field

[0001] This application relates to the field of computerized flat knitting machines, and in particular to a needle plate extension structure for flat knitting machines. Background Technology

[0002] A computerized flat knitting machine is a double-needle plate-latch weft knitting machine. Its cam mechanism acts like a set of planar cams. The needle feet can enter the grooves of the cams, and by moving the cams, the needles are forced to move up and down rhythmically within the needle grooves of the needle plate. Through the actions of the needle hook and the needle latch, the yarn is knitted into fabric. During the upward movement of the needle, the loops gradually exit the needle hook, the needle latch opens, and the loops are hung on the needle bar. During the downward movement of the needle, the needle hook catches newly placed yarn and pulls it to bend into a loop. Simultaneously, the existing loops exit the needle hook, and the new loops pass through the old loops, connecting with them in series. Numerous loops are interconnected to form the knitted fabric.

[0003] Existing computerized flat knitting machines have yarn cutters at both ends of the needle plate. These yarn cutters cut the yarn after the fabric is knitted, thus separating the yarn from the two pieces of fabric. However, the existing yarn cutters are complex in structure and expensive. Furthermore, their installation on the needle plate can interfere with the operation of the yarn feeder. Therefore, our company has developed a needle-type yarn cutting structure. This structure involves installing a hook with a cutter inside the needle plate. When yarn cutting is needed, a triangular device on the machine head drives the hook with the cutter to slide and hook and cut the yarn. However, when the needle plate is fully knitted, there is no needle groove to accommodate the yarn cutting structure, making it unusable when the needle is fully knitted. Utility Model Content

[0004] In order to enable the needle-type yarn-cutting structure to be used when the needle plate is full, this application provides a flat knitting machine needle plate extension structure.

[0005] The technical solution for the needle plate extension structure of a flat knitting machine provided in this application is as follows:

[0006] A pin plate extension structure for a flat knitting machine includes a plate body comprising a front plate and a rear plate. The front and rear plates are fixed together by a connecting rod to form a pin plate structure with a triangular cross-section. Extension plates are detachably mounted at both ends of the plate body along its length. A disassembly assembly is provided between the extension plates and the plate body. The extension plates are detachably mounted on the plate body via the disassembly assembly. The disassembly assembly includes an insert block, a slot, a fixing block, and a fixing groove. The insert block is slidably disposed at one end of the plate body along its length. The slot is located at one end of the extension plate along its width. The insert block is slidably inserted into the slot. The fixing block is slidably disposed on the side wall of the insert block. The fixing groove is located on the side wall of the slot. The insert block is slidably inserted into the slot or stored in the fixing block.

[0007] By adopting the above technical solution, the needle plate is extended by adding an extension plate to the plate body, thereby providing installation space for the needle-type yarn cutting structure, so that the needle-type yarn cutting structure can be used when the needle plate is full of needles.

[0008] Optionally, a driving mechanism is provided between the fixed block and the insert block. The driving mechanism includes a sliding rod, an abutment block, and a wedge-shaped surface. The sliding rod is slidably disposed at the end of the insert block away from the plate body. The abutment block is fixed on the sliding rod. The wedge-shaped surface is opened at the end of the fixed block inserted into the insert block. The abutment block abuts against the wedge-shaped surface. The sliding rod slides towards the insert block, causing the abutment block to slide. The abutment block abuts against the wedge-shaped surface, driving the fixed block to slide out of the insert block. An elastic element is provided between the fixed block and the insert block. The elastic element drives the fixed block to slide and be housed inside the insert block.

[0009] By adopting the above technical solution, the drive mechanism can make the fixing block extend out of the insert block after the insert block is inserted into the slot, thereby fixing the expansion board. At the same time, it also reduces the probability that the fixing block will slide out of the insert block before the insert block is inserted into the slot and affect the insertion of the insert block into the slot.

[0010] Optionally, the slot bottom is provided with an insertion hole, and a push rod is slidably inserted into the insertion hole. The push rod is flush with the bottom of the slot or stored in the insertion hole by sliding. The insertion hole and the sliding rod are adapted to each other. When the push rod is stored in the insertion hole, the sliding rod is slidably inserted into the insertion hole.

[0011] By adopting the above technical solution, the insertion hole and the top rod can provide sliding space for the sliding rod when the expansion plate needs to be disassembled, so that the fixing block can be reset and stored in the insertion block.

[0012] Optionally, a reset spring is provided between the insert block and the plate body, and the reset spring drives the insert block to slide and be housed in the plate body.

[0013] By adopting the above technical solution, the reset spring can keep the insert block retracted in the plate under normal conditions, reducing the probability of damage to the insert block or the fixing block on the insert block caused by external impact.

[0014] Optionally, a drive rod is rotatably mounted on the plate, with one end of the drive rod abutting against one end of the insert block inserted into the plate, and the other end of the drive rod extending out of one end of the plate along its length.

[0015] By adopting the above technical solution, the drive rod can slide the insert out of the board body by abutting the drive rod during the installation of the expansion board, thereby facilitating the installation of the expansion board. At the same time, the drive rod can also provide a pushing force to move the expansion board away from the board body when the expansion board is disassembled, so as to prevent the expansion part from sticking to the board body and facilitate the disassembly of the expansion board.

[0016] Optionally, an insert block is slidably provided at the end of the expansion plate away from the plate body in the width direction.

[0017] By adopting the above technical solution, an insert block is set on the side of the expansion board away from the board body in the width direction, so that more expansion boards can be installed on the expansion board for expansion.

[0018] Optionally, the connecting rod is slidably mounted on the needle plate, and a fixing bolt is installed on the connecting rod to fix the connecting rod.

[0019] By adopting the above technical solution, the sliding setting of the connecting rod can adjust the position of the connecting rod after the expansion plate is installed, so that it can be used to install ordinary knitting needles in the expansion section for the expansion of knitting needles.

[0020] Optionally, the connecting rod includes a sliding part, a connecting part, and an abutting part. The sliding part is slidably disposed on the needle plate, the connecting part is fixed on the sliding part and extends to one end in the length direction of the plate body, and the abutting part is fixed on the connecting part and abuts against the front plate and the rear plate on opposite sides.

[0021] By adopting the above technical solution, when the connecting part abuts against the expansion plate, the sliding part can still slide on the plate, which facilitates the fixing of the connecting rod on the plate.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By adding an extension plate to the plate body to extend the needle plate, installation space is provided for the knitting needle type yarn cutting structure, so that the knitting needle type yarn cutting structure can be used when the needle plate is full of needles;

[0024] 2. The drive mechanism is designed to allow the fixing block to extend out of the insert block after the insert block is inserted into the slot, thereby fixing the expansion board and reducing the probability that the fixing block will slide out of the insert block before the insert block is inserted into the slot, thus affecting the insertion of the insert block into the slot.

[0025] 3. The insertion hole, in conjunction with the top rod, allows the sliding rod to have sliding space when the expansion plate needs to be removed, thereby enabling the fixing block to be reset and stored in the insertion block;

[0026] 4. The reset spring allows the insert to be stored in the board body under normal conditions, reducing the probability of damage to the insert or the fixing block on the insert due to external impact. The drive rod allows the insert to slide out of the board body by abutting the drive rod during the installation of the expansion board, thus facilitating the installation of the expansion board. The drive rod also provides a pushing force to move the expansion board away from the board body when the expansion board is disassembled, preventing the expansion part from sticking to the board body and facilitating the disassembly of the expansion board.

[0027] 5. An insert block is provided on the side of the expansion board away from the board body in the width direction, so that more expansion boards can be installed on the expansion board for further expansion;

[0028] 6. The sliding setting of the connecting rod allows the position of the connecting rod to be adjusted after the expansion plate is installed, so that it can be used to install ordinary knitting needles in the expansion plate for the expansion of knitting needles. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a needle-type yarn-cutting structure.

[0030] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 3 yes Figure 2 A magnified view of section A in the middle.

[0032] Explanation of reference numerals in the attached drawings: 1. Plate body; 101. Front plate; 102. Rear plate; 2. Connecting rod; 21. Sliding part; 22. Connecting part; 23. Abutting part; 3. Extension plate; 4. Assembly / disassembly assembly; 41. Insert block; 42. Slot; 43. Fixing block; 44. Fixing groove; 5. Drive mechanism; 51. Sliding rod; 52. Abutting block; 53. Wedge-shaped surface; 6. Elastic element; 7. Insertion hole; 8. Top rod; 9. Return spring; 10. Drive rod; 11. Fixing bolt; 12. Toggle rod; 13. Needle groove; 14. Hook knife; 15. Fixed knife; 16. Wire pressing spring; 17. Hook groove; 18. Cutting opening. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0034] First, it should be noted that in the description of this application, the use of directional terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for descriptive purposes and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of numerical quantifiers such as "first," "second," and "third" is for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, interference fits, transition fits, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Therefore, those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] The needle-type yarn-cutting structure mentioned in the background of this application refers to... Figure 1 The machine includes a hook knife 14, a fixed knife 15, and a pressure spring 16. The hook knife 14 is slidably disposed in one of the needle grooves 13. The fixed knife 15 and the pressure spring 16 are fixedly mounted on the plate 1 or the extension plate 3 on both sides of the hook knife 14 in the width direction. The fixed knife 15 and the pressure spring 16 abut against both sides of the hook knife 14 in the width direction. The fixed knife 15 is located on the side of the hook knife 14 facing the center of the plate 1. The hook knife 14 has a hook groove 17. The hook groove 17 has a cutting opening 18 on the side facing the fixed knife 15. The machine head moves to the hook knife 14 through a triangular movement and drives the hook knife 14 to start the needle and hook the yarn. When the hook knife 14 retracts the needle, it pulls the yarn to be cut to the fixed knife 15 and the pressure spring 16. The pressure spring 16 clamps and fixes the yarn, and then the hook knife 14 and the fixed knife 15 clamp and cut the yarn, thus realizing yarn cutting.

[0036] This application discloses a pin plate extension structure for a flat knitting machine, referring to... Figure 2 and Figure 3 The system includes a plate 1, which comprises a front plate 101 and a rear plate 102. The front plate 101 and the rear plate 102 are fixed together by connecting rods 2 to form a needle plate structure with a triangular cross-section. The two ends of the connecting rods 2 in the length direction abut against the opposite sides of the front plate 101 and the rear plate 102. There are several connecting rods 2, which are respectively set near the two ends of the length direction of the plate 1. The middle area of ​​the connecting rods 2 at both ends of the length direction is the knitted fabric feeding area. Therefore, the connecting rods 2 need to be set near the two ends of the length direction of the plate 1 to avoid affecting the normal feeding of the knitted fabric. Several needle grooves 13 are evenly opened along the length direction of the opposite side of the front plate 101 and the rear plate 102. Both ends of the plate 1 in the length direction are detachably provided with extension plates 3. The extension plates 3 are rectangular plates 1. Several needle grooves 13 are evenly opened along the width direction of the thickness side of the extension plates 3. A disassembly assembly 4 is provided between the extension plates 3 and the plate 1. The extension plates 3 can be detachably installed on the plate 1 through the disassembly assembly 4. In this embodiment, the extension plates 3 and the plate 1 are connected by a disassembly assembly 4. Two sets of disassembly and assembly components 4 are provided, and the two sets of disassembly and assembly components 4 are respectively located at both ends near the length direction of the expansion plate 3. The disassembly and assembly components 4 include an insertion block 41 slidably disposed at one end of the length direction of the plate body 1, a slot 42 opened at one end of the width direction of the expansion plate 3, a fixing block 43 slidably disposed on the side wall of the insertion block 41, and a fixing groove 44 opened on the side wall of the slot 42. The insertion block 41 is inserted into the slot 42 by sliding. In this embodiment, two fixing blocks 43 are provided, and the two fixing blocks 43 are respectively disposed on the insertion block 41. On both sides, two fixing slots 44 are provided corresponding to fixing blocks 43. The insert block 41 is inserted into the slot 42 by sliding or stored in the fixing block 43. When the insert block 41 is fully inserted into the fixing slot 44, the fixing slot 44 and the fixing block 43 are aligned with each other. At this time, the fixing block 43 can be inserted into the fixing slot 44 by sliding. By adding an extension plate 3 on the plate body 1 to extend the needle plate, installation space is provided for the knitting needle type yarn cutting structure, so that the knitting needle type yarn cutting structure can be used when the needle plate is full of needles.

[0037] Reference Figure 2 and Figure 3 A driving mechanism 5 is provided between the fixed block 43 and the insertion block 41. The driving mechanism 5 includes a sliding rod 51 slidably disposed at the end of the insertion block 41 away from the plate 1, an abutment block 52 fixed on the sliding rod 51, and a wedge-shaped surface 53 formed at the end of the fixed block 43 that inserts into the insertion block 41. In this embodiment, the fixed block 43 is provided with two abutment blocks 52 corresponding to the fixed block 43. The two abutment blocks 52 abut against the wedge-shaped surfaces 53 of the two fixed blocks 43 respectively. The sliding rod 51 slides toward the insertion block 41, causing the abutment block 52 to slide. The abutment block 52 abuts against the wedge-shaped surface 53, driving the fixed block 43 to slide out of the insertion block 41. When the insert 41 is fully inserted into the slot 42, the sliding rod 51 abuts against the bottom of the slot 42, and slides into the insert 41 through the abutment of the bottom of the slot 42. Then, the sliding rod 51 drives the abutment block 52 to slide, and the abutment block 52 drives the fixing block 43 to slide out of the insert 41, so that the fixing block 43 is inserted into the fixing slot 44. A spring 6 is provided between the fixing block 43 and the insert 41. In this embodiment, the spring 6 is a spring. The spring 6 drives the fixing block 43 to slide and be housed in the insert 41 through its elasticity. The driving mechanism 5 is provided so that the fixing block 43 can extend out of the insert 41 after the insert 41 is inserted into the slot 42. This design secures the expansion board 3 and reduces the probability that the fixing block 43 will slide outside the insert block 41 before the insert block 41 is inserted into the slot 42, thus affecting the insertion of the insert block 41 into the slot 42. The slot 42 has an insertion hole 7 at its bottom, and a push rod 8 is slidably inserted into the insertion hole 7. The push rod 8 slides to be flush with the bottom of the slot 42 or is retracted into the insertion hole 7. The insertion hole 7 is compatible with the sliding rod 51. When the push rod 8 is retracted into the insertion hole 7, the elastic element 6 drives the fixing block 43 to be retracted into the insert block 41. The fixing block 43, through the abutment rod, drives the sliding rod 51 to slide and insert into the insertion hole 7. At this time, the insert block 41 can be removed from the slot 42. The insertion hole 7, in conjunction with the push rod 8, allows the sliding rod 51 to have sliding space when the expansion plate 3 needs to be disassembled, thereby enabling the fixing block 43 to be reset and stored in the insertion block 41. In this embodiment, two sets of disassembly and assembly components 4 are provided, so there are even two push rods 8 on the expansion plate 3. In this embodiment, the two push rods 8 are connected by a lever 12. The lever 12 is slidably set on the expansion plate 3. A spring is provided between the lever 12 and the expansion plate 3. The spring force causes the lever 12 to drive the push rod 8 to be flush with the bottom of the slot 42 in normal state. A bolt is threaded on the lever 12. Tightening the bolt can fix the lever 12 on the expansion plate 3.

[0038] Reference Figure 2 and Figure 3A return spring 9 is provided between the insert block 41 and the plate 1. The return spring 9 drives the insert block 41 to slide and be stored inside the plate 1 through elastic force. The setting of the return spring 9 can make the insert block 41 normally stored inside the plate 1, reducing the probability of damage to the insert block 41 or the fixing block 43 on the insert block 41 due to external impact. A drive rod 10 is rotatably provided on the plate 1. One end of the drive rod 10 abuts against the end of the insert block 41 inserted into the plate 1, and the other end of the drive rod 10 extends out of the plate 1 along its length. The setting of the drive rod 10 can make the insert block 41 slide out of the plate 1 by abutting against the drive rod 10 when the expansion plate 3 is installed, thereby facilitating the installation of the expansion plate 3. The drive rod 10 can also provide a pushing force to move the expansion plate 3 away from the plate 1 when the expansion plate 3 is disassembled, preventing the expansion part from sticking to the plate 1 and facilitating the disassembly of the expansion plate 3.

[0039] Reference Figure 2 and Figure 3 An insert block 41 is slidably provided on the side of the expansion plate 3 away from the plate body 1 in the width direction, as well as a structure on the plate body 1 for connecting the expansion plate 3. An insert block 41 is provided on the side of the expansion plate 3 away from the plate body 1 in the width direction, so that more expansion plates 3 can be installed on the expansion plate 3 for expansion.

[0040] Reference Figure 2 and Figure 3 The connecting rod 2 is slidably mounted on the plate 1. The connecting rod 2 includes a sliding part 21 slidably mounted on the plate 1, a connecting part 22 fixed on the sliding part 21, and an abutting part 23 fixed on the connecting part 22. The sliding part 21 is slidably mounted in a region near the center of the main body. The connecting part 22 extends to one end of the length direction of the plate 1. The abutting part 23 abuts against the front plate 101 and the rear plate 102 facing each other. A fixing bolt 11 is installed on the connecting part 22 of the connecting rod 2 to fix the connecting rod 2. Under normal conditions, the abutting part 23 of the connecting rod 2 abuts against the end near the length direction of the plate 1, while the sliding part 21 is located near the center of the plate 1. When the extension plate 3 is installed and the extension plate 3 is used to place knitting needles, the fixing bolt 11 is loosened, and the abutting part 23 is driven to slide to the end of the extension plate 3 away from the plate 1 before the fixing bolt 11 is tightened to fix the connecting rod 2. This allows the connecting rod 2 to be outside the knitting area, thereby reducing the impact of the connecting rod 2 on the knitting fabric feeding.

[0041] The implementation principle of this application embodiment is as follows: When a needle-type yarn-cutting structure needs to be installed under full needle conditions or when additional needles are needed, the extension plate 3 abuts against the plate body 1, and the extension plate 3 abuts against the drive rod 10, causing the drive rod 10 to rotate. The drive rod 10 drives the insert block 41 to slide into the slot 42 of the extension plate 3. When the insert block 41 is fully inserted into the slot 42, the sliding rod 51 abuts against the bottom of the slot 42 and slides into the insert block 41, and drives the fixing block 43 to slide into the fixing slot 44 to complete the installation and fixing of the extension plate 3; when it is necessary to install a needle-type yarn-cutting structure or add needles, the extension plate 3 is installed in full needle conditions. When disassembling the expansion board 3, the drive lever slides away from the board body 1, the push rod 8 slides to open the insertion hole 7, the sliding rod 51 loses its contact, and the fixing block 43 is disengaged from the fixing groove 44 and stored in the insertion block 41 under the elastic force of the elastic member 6. The insertion block 41 abuts against the drive rod 10 under the elastic force of the return spring 9, causing the drive rod 10 to rotate. The drive rod 10 applies a force to the expansion board 3 to slide away from the board body 1, thus removing the expansion board 3 and completing the disassembly of the expansion board 3. At this time, the insertion block 41 resets and slides into the slot 42 to complete the reset.

[0042] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A needle plate extension structure for a flat knitting machine, comprising a plate body (1), the plate body (1) comprising a front plate (101) and a rear plate (102), the front plate (101) and the rear plate (102) being fixed together by a connecting rod (2) to form a needle plate structure with a triangular cross section, characterized in that: The plate (1) is detachably provided with extension plates (3) at both ends along its length. A disassembly assembly (4) is provided between the extension plate (3) and the plate (1). The extension plate (3) is detachably installed on the plate (1) through the disassembly assembly (4). The disassembly assembly (4) includes an insert (41), a slot (42), a fixing block (43), and a fixing groove (44). The insert (41) is slidably disposed at one end along the length of the plate (1). The slot (42) is opened at one end along the width of the extension plate (3). The insert (41) is inserted into the slot (42) by sliding. The fixing block (43) is slidably disposed on the side wall of the insert (41). The fixing groove (44) is opened on the side wall of the slot (42). The insert (41) is inserted into the slot (42) or stored in the fixing block (43) by sliding.

2. The pin plate extension structure of a flat knitting machine according to claim 1, characterized in that: A driving mechanism (5) is provided between the fixed block (43) and the insertion block (41). The driving mechanism (5) includes a sliding rod (51), an abutment block (52), and a wedge-shaped surface (53). The sliding rod (51) is slidably disposed at the end of the insertion block (41) away from the plate (1). The abutment block (52) is fixed on the sliding rod (51). The wedge-shaped surface (53) is formed at the insertion point of the fixed block (43) into the insertion block (41). At one end, the abutting block (52) abuts against the wedge-shaped surface (53), and the sliding rod (51) slides towards the insertion block (41), causing the abutting block (52) to slide. The abutting block (52) abuts against the wedge-shaped surface (53), driving the fixing block (43) to slide out of the insertion block (41). A spring element (6) is provided between the fixing block (43) and the insertion block (41), and the spring element (6) drives the fixing block (43) to slide and be stored in the insertion block (41).

3. The pin plate extension structure of a flat knitting machine according to claim 2, characterized in that: The slot (42) has an insertion hole (7) at the bottom. A push rod (8) is slidably inserted into the insertion hole (7). The push rod (8) is flush with the bottom of the slot (42) or stored in the insertion hole (7). The insertion hole (7) is adapted to the sliding rod (51). When the push rod (8) is stored in the insertion hole (7), the sliding rod (51) is slidably inserted into the insertion hole (7).

4. The pin plate extension structure of a flat knitting machine according to claim 3, characterized in that: A reset spring (9) is provided between the insert (41) and the plate (1), and the reset spring (9) drives the insert (41) to slide and be housed in the plate (1).

5. The pin plate extension structure of a flat knitting machine according to claim 4, characterized in that: A drive rod (10) is rotatably mounted on the plate (1). One end of the drive rod (10) abuts against the insertion block (41) at one end of the plate (1), and the other end of the drive rod (10) extends out of the plate (1) along its length.

6. The pin plate extension structure of a flat knitting machine according to claim 5, characterized in that: An insert (41) is slidably provided at the end of the expansion plate (3) away from the plate body (1) in the width direction.

7. The pin plate extension structure of a flat knitting machine according to claim 1, characterized in that: The connecting rod (2) is slidably mounted on the plate (1), and a fixing bolt (11) is installed on the connecting rod (2) to fix the connecting rod (2).

8. The pin plate extension structure of a flat knitting machine according to claim 7, characterized in that: The connecting rod (2) includes a sliding part (21), a connecting part (22) and an abutting part (23). The sliding part (21) is slidably disposed on the plate (1). The connecting part (22) is fixed on the sliding part (21) and extends to one end of the plate (1) in the length direction. The abutting part (23) is fixed on the connecting part (22) and abuts against the front plate (101) and the rear plate (102) on opposite sides.

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