Supporting plate for supporting chain wheel bracket

Abstract

The utility model belongs to the technical field of supporting plates, and discloses a supporting plate for a supporting chain wheel bracket, which comprises a base, a groove is arranged on the upper surface of the base, a driving mechanism is arranged in the groove of the base, two groups of locking blocks are arranged on the upper surface of the driving mechanism, and clamping grooves are arranged on the upper surfaces of the two groups of locking blocks. Positioning mechanisms capable of being rapidly assembled and disassembled are installed in the clamping grooves of the two locking blocks, limiting mechanisms are arranged on the front faces of the positioning mechanisms, clamping grooves are formed in the bottoms of the inner walls of the positioning mechanisms, and protection mechanisms are arranged in the clamping grooves of the positioning mechanisms. And a fixing mechanism is installed in the groove of the set of locking blocks on the left side, the two sets of locking blocks are pulled to move by starting the positioning mechanism, the top ends of the two sets of locking blocks are attached, and therefore the stability of the connecting position of the two sets of locking blocks is further kept.

Description

Technical Field

[0001] The utility model relates to the technical field of supporting plates, in particular to a supporting plate for a supporting chain wheel bracket. Background Art

[0002] The support plate for the sprocket wheel bracket is used to install the sprocket wheel of the crawler excavator.

[0003] The camming mechanism that is formed on the upper and lower surfaces of the sliding plate is abutted against the camming member, and the camming member is engaged with the sliding plate and the sliding plate, and the camming member is engaged with the sliding plate and the sliding plate, respectively.

[0004] In the process of implementing this application, it was found that the technology has the following problems: most of the existing sprocket wheel bracket support plates are moved by starting the winding mechanism to pull the top ends of the two sets of locking blocks to fit the adjacent sides of the two sets of locking blocks together, but most of the winding mechanisms are arranged inside the two sets of locking blocks, making it impossible to replace the subsequent winding mechanism when it is damaged, thereby reducing the practicality of the equipment.

[0005] For this reason, a support plate for a sprocket wheel bracket is proposed. Utility Model Content

[0006] The utility model aims to solve the problem that most winding mechanisms are arranged inside two sets of locking blocks, so that the subsequent winding mechanisms cannot be replaced when damaged. The utility model provides a supporting plate for a sprocket wheel bracket.

[0007] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0008] A support plate for a sprocket wheel bracket comprises a base, a groove is formed on the upper surface of the base, a driving mechanism is arranged inside the groove of the base, two groups of locking blocks are installed on the upper surface of the driving mechanism, slots are formed on the upper surfaces of the two groups of locking blocks, positioning mechanisms that can be quickly installed and disassembled are installed inside the slots of the two groups of locking blocks, a limiting mechanism is provided on the front of the positioning mechanism, a slot is formed on the bottom of the inner wall of the positioning mechanism, a protective mechanism is arranged inside the slot of the positioning mechanism, a groove is formed on the upper surface of the left group of locking blocks, and a fixing mechanism is installed inside the groove of the left group of locking blocks.

[0009] Further, the driving mechanism comprises a bidirectional electric telescopic rod, which is mounted on the bottom of the inner wall of the base groove, and sliders are mounted on the left and right output ends of the bidirectional electric telescopic rod, and two groups of the sliders are respectively mounted on the lower surfaces of the two groups of locking blocks;

[0010] The positioning mechanism comprises two groups of fixing plates, the upper surfaces of the two groups of locking blocks are provided with card slots, and the two groups of fixing plates are respectively clamped in the card slots of the two groups of locking blocks, a positioning roller is installed on the upper surface of the left group of fixing plates, and a cable is fastened to the outer surface of the positioning roller, and an L-shaped fixing plate is installed on the upper surface of the right group of fixing plates, a motor is installed on the top of the inner wall of the L-shaped fixing plate, a winding roller is installed on the output shaft of the motor, and the end of the cable away from the positioning roller is installed on the outer surface of the winding roller, a gear 1 is installed on the outer surface of the output shaft of the motor, and the external teeth of the gear 1 are meshed and connected with the gear 2, a screw is installed inside the gear 2, the top end of the screw is rotatably connected to the top of the inner wall of the L-shaped fixing plate, and the external thread of the screw is connected with a slide plate, a card slot is opened on the inner side wall of the L-shaped fixing plate, and the back side of the slide plate is slidably connected to the inside of the card slot of the L-shaped fixing plate, and a U-shaped lifting plate is arranged on the side of the slide plate away from the positioning roller, and the position of the U-shaped lifting plate is located at the lower end of the cable.

[0011] Furthermore, the protective mechanism includes two groups of fixed blocks, the upper surface of the fixed plate of the left group is provided with two groups of grooves, the two groups of fixed blocks are slidably connected inside the two groups of grooves of the fixed plate of the left group, and protective covers are installed on the upper surfaces of the two groups of fixed blocks, the lower surfaces of the protective covers are installed on the upper surface of the fixed plates of the right group, a control panel is provided on the front of the protective cover, and the positioning roller is located outside the moving path of the protective cover.

[0012] Furthermore, the limiting mechanism includes a connecting block, which is installed on the front side of the U-shaped lifting plate. A groove is provided on the upper surface of the connecting block. A fixing rod is slidably connected inside the groove of the connecting block. The lower surface of the fixing rod is installed on the upper surface of the fixing plate of the right group.

[0013] Furthermore, a card slot is provided on the upper surface of the protective cover, and a visual window is provided inside the card slot of the protective cover.

[0014] Furthermore, the fixing mechanism includes a rotating rod, which is rotatably connected to the groove of the left group of locking blocks, the height of the lower surface of the rotating rod is parallel to the height of the upper surfaces of the two groups of fixing plates, the upper surface of the rotating rod is provided with a groove, and a pin is inserted into the groove of the rotating rod, and the upper surface of the right group of locking blocks is provided with a groove, and the position of the groove of the right group of locking blocks is located on the moving path of the pin.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. The utility model starts a motor to drive the winding roller to rotate, so that the winding roller reels the cable during the rotation, and then the cable pulls the positioning roller to drive a group of locking blocks on the left side to move, so that the top ends of the two groups of locking blocks fit together, thereby further maintaining the stability of the connection between the two groups of locking blocks; the positioning mechanism is set at the top ends of the two groups of locking blocks, and then two groups of fixing plates are clamped in the slots of the two groups of locking blocks, so that the positioning mechanism can be disassembled during idleness, thereby facilitating subsequent maintenance or replacement of the positioning mechanism by subsequent staff.

[0017] 2. The utility model triggers gear 1 to drive gear 2 and the screw to rotate during the startup process of the motor, so that the screw synchronously drives the slide plate and the U-shaped lifting plate to move upward during the rotation process, and then the position of the U-shaped lifting plate is set at the lower end of the cable, so that the U-shaped lifting plate drives the cable to be reeled onto the outer surface of the reel in the process of moving upward, forming a auger shape, thereby avoiding the cable from accumulating in the same area when it is reeled on the outer surface of the reel, causing the cable to deviate during use and cause the cable to loosen, thereby improving the stability of the positioning mechanism when limiting the top position of the two sets of locking blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the top surface structure of the utility model;

[0019] Figure 2 It is a front structural schematic diagram of the utility model;

[0020] Figure 3 It is a side structural schematic diagram of the limit rod of the utility model;

[0021] Figure 4 It is a schematic diagram of the top surface structure of the driving mechanism of the utility model;

[0022] Figure 5 This utility model Figure 2 Enlarged view of point A in the middle.

[0023] Figure numerals: 1. base; 2. locking block; 3. positioning mechanism; 301. fixing plate; 302. positioning roller; 303. cable; 304. winding roller; 305. L-shaped fixing plate; 306. motor; 307. gear one; 308. screw; 309. gear two; 310. slide plate; 311. U-shaped lifting plate; 4. protection mechanism; 401. fixing block; 402. protection cover; 403. control panel; 5. visual window; 6. limiting mechanism; 601. connecting block; 602. fixing rod; 7. fixing mechanism; 701. rotating rod; 702. latch; 8. driving mechanism; 801. two-way electric telescopic rod; 802. slider. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0028] like Figures 1 to 5As shown, a support plate for a sprocket wheel bracket comprises a base 1, a groove is formed on the upper surface of the base 1, a driving mechanism 8 is arranged inside the groove of the base 1, two sets of locking blocks 2 are installed on the upper surface of the driving mechanism 8, the upper surfaces of the two sets of locking blocks 2 are provided with slots, and positioning mechanisms 3 capable of quick installation and removal are installed inside the slots of the two sets of locking blocks 2, a limiting mechanism 6 is arranged on the front of the positioning mechanism 3, a slot is formed on the bottom of the inner wall of the positioning mechanism 3, a protective mechanism 4 is arranged inside the slot of the positioning mechanism 3, a groove is formed on the upper surface of the left set of locking blocks 2, and the left set of locking blocks 2 is provided with a groove. A fixing mechanism 7 is installed inside the groove of one set of locking blocks 2 on the side; specifically, by starting the positioning mechanism 3 to pull the two sets of locking blocks 2 to move, the top ends of the two sets of locking blocks 2 are fitted together, thereby further maintaining the stability of the connection between the two sets of locking blocks 2; by rotating the fixing mechanism 7, the lower surface of the fixing mechanism 7 is abutted against the bottom of the inner wall of the positioning mechanism 3, so that the fixing mechanism 7 limits the moving position of the positioning mechanism 3 inside the two sets of slots of the locking blocks 2, thereby minimizing the movement of the positioning mechanism 3 inside the slots of the two sets of locking blocks 2 during use.

[0029] like Figures 1 to 4 As shown, the driving mechanism 8 includes a bidirectional electric telescopic rod 801, which is installed at the bottom of the inner wall of the groove of the base 1, and sliders 802 are installed on the left and right output ends of the bidirectional electric telescopic rod 801, and two groups of sliders 802 are respectively installed on the lower surfaces of the two groups of locking blocks 2;

[0030] The positioning mechanism 3 includes two sets of fixing plates 301, and the upper surfaces of the two sets of locking blocks 2 are provided with card slots. The two sets of fixing plates 301 are respectively connected to the inside of the card slots of the two sets of locking blocks 2. A positioning roller 302 is installed on the upper surface of the left set of fixing plates 301, and the outer surface of the positioning roller 302 is fastened with a cable 303. An L-shaped fixing plate 305 is installed on the upper surface of the right set of fixing plates 301, and a motor 306 is installed on the top of the inner wall of the L-shaped fixing plate 305. A winding roller 304 is installed on the output shaft of the motor 306, and the end of the cable 303 away from the positioning roller 302 is installed on the outer surface of the winding roller 304. A gear 1 307 is installed on the outer surface of the output shaft 306, and the outer teeth of the gear 1 307 are meshed with the gear 2 309, and a screw 308 is installed inside the gear 2 309. The top of the screw 308 is rotatably connected to the top of the inner wall of the L-shaped fixing plate 305, and the outer thread of the screw 308 is connected to the slide plate 310. The inner wall of the L-shaped fixing plate 305 is provided with a slot, and the back of the slide plate 310 is slidably connected to the inside of the slot of the L-shaped fixing plate 305. A U-shaped lifting plate 311 is provided on the side of the slide plate 310 away from the positioning roller 302, and the position of the U-shaped lifting plate 311 is located at the right lower end of the cable 303;

[0031] Specifically, the winding roller 304 is driven to rotate by starting the motor 306, so that the winding roller 304 reels the cable 303 during the rotation, and then the cable 303 pulls the positioning roller 302 to drive the left group of locking blocks 2 to move, so that the top ends of the two groups of locking blocks 2 are fitted together, thereby further maintaining the stability of the connection between the two groups of locking blocks 2; the positioning mechanism 3 is set at the top ends of the two groups of locking blocks 2, and then the two groups of fixing plates 301 are clamped in the slots of the two groups of locking blocks 2, so that the positioning mechanism 3 can be disassembled during the idle process, thereby facilitating the subsequent maintenance or replacement of the positioning mechanism 3 by the staff.

[0032] At the same time, during the startup process, the motor 306 triggers the gear 1 307 to drive the gear 2 309 and the screw 308 to rotate, so that the screw 308 synchronously drives the slide plate 310 and the U-shaped lifting plate 311 to move upward during the rotation, and then the U-shaped lifting plate 311 is set at the lower end of the cable 303, so that the U-shaped lifting plate 311 drives the cable 303 to be wound to the outer surface of the winding roller 304 in the process of moving upward, forming a auger shape, thereby avoiding the cable 303 from accumulating in the same area when it is wound on the outer surface of the winding roller 304, causing the cable 303 to be offset during use and causing the cable 303 to loosen, thereby improving the stability of the positioning mechanism 3 in limiting the top position of the two sets of locking blocks 2.

[0033] like Figure 1 and Figure 2 As shown, the protection mechanism 4 includes two groups of fixed blocks 401, two groups of grooves are opened on the upper surface of the left group of fixed plates 301, and the two groups of fixed blocks 401 are slidably connected inside the two groups of grooves of the left group of fixed plates 301, and the upper surfaces of the two groups of fixed blocks 401 are installed with protection covers 402, and the lower surfaces of the protection covers 402 are installed on the upper surfaces of the right group of fixed plates 301. A control panel 403 is arranged on the front of the protection covers 402, and the position of the positioning roller 302 is located outside the moving path of the protection covers 402; specifically, the position of the protection covers 402 is arranged at the upper ends of the two groups of fixed plates 301, so that the protection covers 402 During use, the upper devices of the two groups of fixed plates 301 are blocked, so as to minimize the contact between the subsequent positioning mechanism 3 and foreign objects during use, which may cause the positioning mechanism 3 to be unable to be used normally, thereby reducing the number of times the staff regularly cleans the positioning mechanism 3; the two groups of fixed blocks 401 are slidably connected to the two groups of grooves of the left group of fixed plates 301, so that the protective cover 402 can slide normally on the upper end of the left group of fixed plates 301, so as to minimize the subsequent protective mechanism 4 blocking the normal adjustment and movement of the position of the two groups of locking blocks 2 when the protective mechanism 4 blocks the positioning mechanism 3 for protection.

[0034] At the same time, by positioning the positioning roller 302 outside the moving path of the protective cover 402, it is possible to avoid the subsequent protective cover 402 being blocked by the positioning roller 302 during movement, thereby causing the positions of the two sets of locking blocks 2 to be unable to be adjusted normally; by operating the control panel 403 to start the motor 306, the staff does not need to adjust the moving protective cover 402 during the process of turning on the motor 306, thereby avoiding the protective cover 402 blocking the motor 306 and affecting the staff's normal operation of the positioning mechanism 3.

[0035] like Figure 2 and Figure 3 As shown, the limiting mechanism 6 includes a connecting block 601, which is installed on the front side of the U-shaped lifting plate 311. A groove is provided on the upper surface of the connecting block 601. A fixing rod 602 is slidably connected inside the groove of the connecting block 601. The lower surface of the fixing rod 602 is installed on the upper surface of a group of fixing plates 301 on the right side. Specifically, the connecting block 601 is slidably connected to the outer surface of the fixing rod 602, so that the fixing rod 602 limits the moving path of the connecting block 601 and the U-shaped lifting plate 311, thereby avoiding the subsequent bending of the U-shaped lifting plate 311 during the height adjustment process as much as possible, thereby improving the service life of the U-shaped lifting plate 311.

[0036] like Figure 1 As shown, a card slot is provided on the upper surface of the protective cover 402, and a visual window 5 is provided inside the card slot of the protective cover 402; specifically, the visual window 5 is made of visible material, so that the staff can view the use status of some accessories of the protective positioning mechanism 3 that are blocked inside the protective mechanism 4 through the visual window 5, thereby facilitating the subsequent staff to promptly dismantle the mobile protective mechanism 4 and perform timely maintenance on some accessories of the protective positioning mechanism 3 that are blocked inside the protective mechanism 4.

[0037] like Figure 1 , Figure 2 and Figure 5As shown, the fixing mechanism 7 includes a rotating rod 701, which is rotatably connected to the groove of the left group of locking blocks 2, the height of the lower surface of the rotating rod 701 and the height of the upper surface of the two groups of fixing plates 301 remain parallel, the upper surface of the rotating rod 701 is provided with a groove, and a latch 702 is inserted in the groove of the rotating rod 701, and the upper surface of the right group of locking blocks 2 is provided with a groove, and the position of the groove of the right group of locking blocks 2 is located on the moving path of the latch 702; specifically, when the two groups of fixing plates 301 are installed in the card slots of the two groups of locking blocks 2, the rotating rod 701 is rotated to The lower surfaces of the front and rear ends of 701 are respectively rotated to abut against the upper surfaces of the two groups of fixing plates 301, so that the rotating rod 701 limits the moving position of the two groups of fixing plates 301 inside the slots of the two groups of locking blocks 2, thereby minimizing the movement of the two groups of fixing plates 301 during subsequent use; by pushing the latch 702, the bottom end of the latch 702 is passed through the internal groove of the rotating rod 701 and installed in the groove of the right group of locking blocks 2, so that the latch 702 limits the rotation position of the rotating rod 701 during use, thereby minimizing the rotation of the rotating rod 701 during use.

[0038] In summary: by starting the motor 306 to drive the winding roller 304 to rotate, the winding roller 304 reels the cable 303 during the rotation, and then the cable 303 pulls the positioning roller 302 to drive the left group of locking blocks 2 to move, so that the tops of the two groups of locking blocks 2 are fitted together, thereby further maintaining the stability of the connection between the two groups of locking blocks 2; the motor 306 triggers the gear 1 307 during the startup process to drive the gear 2 309 and the screw 308 to rotate, so that the screw 3 08 During the rotation, the slide plate 310 and the U-shaped lifting plate 311 are synchronously driven to move upward, and the U-shaped lifting plate 311 is positioned at the lower end of the cable 303, so that the U-shaped lifting plate 311 drives the cable 303 to be wound onto the outer surface of the winding roller 304 in a screw shape during the upward movement, thereby avoiding the cable 303 from accumulating in the same area when it is wound on the outer surface of the winding roller 304, causing the cable 303 to deviate during use and cause the cable 303 to loosen.

[0039] At the same time, by rotating the rotating rod 701, the lower surfaces of the front and rear ends of the rotating rod 701 are respectively rotated to abut against the upper surfaces of the two groups of fixed plates 301, so that the rotating rod 701 limits the moving position of the two groups of fixed plates 301 inside the slots of the two groups of locking blocks 2, thereby minimizing the subsequent movement of the two groups of fixed plates 301 during use; by pushing the latch 702, the bottom end of the latch 702 is passed through the internal groove of the rotating rod 701 and installed in the groove of the right group of locking blocks 2, so that the latch 702 limits the rotation position of the rotating rod 701 during use.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A support plate for a sprocket wheel bracket, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a groove, a driving mechanism (8) is arranged inside the groove of the base (1), two groups of locking blocks (2) are installed on the upper surface of the driving mechanism (8), the upper surfaces of the two groups of locking blocks (2) are provided with a card slot, and the card slots of the two groups of locking blocks (2) are provided with a positioning mechanism (3) that can be quickly installed and removed, a limiting mechanism (6) is arranged on the front of the positioning mechanism (3), a card slot is arranged at the bottom of the inner wall of the positioning mechanism (3), and a protective mechanism (4) is arranged inside the card slot of the positioning mechanism (3), the upper surface of the left group of locking blocks (2) is provided with a groove, and a fixing mechanism (7) is installed inside the groove of the left group of locking blocks (2).

2. The support plate for a sprocket wheel bracket according to claim 1, characterized in that: The driving mechanism (8) comprises a bidirectional electric telescopic rod (801), the bidirectional electric telescopic rod (801) being mounted on the bottom of the inner wall of the groove of the base (1), and sliders (802) being mounted on the left and right output ends of the bidirectional electric telescopic rod (801), and two groups of the sliders (802) being mounted on the lower surfaces of the two groups of locking blocks (2) respectively; The positioning mechanism (3) comprises two groups of fixing plates (301), the upper surfaces of the two groups of locking blocks (2) are provided with card slots, the two groups of fixing plates (301) are respectively connected to the inside of the card slots of the two groups of locking blocks (2), the upper surface of the left group of fixing plates (301) is installed with a positioning roller (302), the outer surface of the positioning roller (302) is fastened with a cable (303), the upper surface of the right group of fixing plates (301) is installed with an L-shaped fixing plate (305), the top of the inner wall of the L-shaped fixing plate (305) is installed with a motor (306), the output shaft of the motor (306) is installed with a winding roller (304), the end of the cable (303) away from the positioning roller (302) is installed on the outer surface of the winding roller (304), and the motor (306) is installed on the outer surface of the winding roller (304). A gear 1 (307) is installed on the outer surface of the output shaft (306), and the external teeth of the gear 1 (307) are meshed with the gear 2 (309), and a screw rod (308) is installed inside the gear 2 (309), and the top end of the screw rod (308) is rotatably connected to the top of the inner wall of the L-shaped fixing plate (305), and the external thread of the screw rod (308) is connected to a slide plate (310), and a groove is provided on the inner wall of the L-shaped fixing plate (305), and the back side of the slide plate (310) is slidably connected to the inside of the groove of the L-shaped fixing plate (305), and a U-shaped lifting plate (311) is provided on the side of the slide plate (310) away from the positioning roller (302), and the position of the U-shaped lifting plate (311) is located at the lower end of the cable (303).

3. The support plate for a sprocket wheel bracket according to claim 2, characterized in that: The protection mechanism (4) comprises two groups of fixed blocks (401), the upper surface of the left group of fixed plates (301) is provided with two groups of grooves, the two groups of fixed blocks (401) are slidably connected inside the two groups of grooves of the left group of fixed plates (301), the upper surfaces of the two groups of fixed blocks (401) are provided with protection covers (402), the lower surfaces of the protection covers (402) are provided on the upper surface of the right group of fixed plates (301), a control panel (403) is provided on the front of the protection covers (402), and the positioning roller (302) is located outside the moving path of the protection covers (402).

4. The support plate for a sprocket wheel bracket according to claim 2, characterized in that: The limiting mechanism (6) comprises a connecting block (601), wherein the connecting block (601) is mounted on the front side of the U-shaped lifting plate (311), and a groove is provided on the upper surface of the connecting block (601), and a fixing rod (602) is slidably connected inside the groove of the connecting block (601), and the lower surface of the fixing rod (602) is mounted on the upper surface of the right group of fixing plates (301).

5. The support plate for a sprocket wheel bracket according to claim 3, characterized in that: The upper surface of the protective cover (402) is provided with a card slot, and a visual window (5) is provided inside the card slot of the protective cover (402).

6. The support plate for a sprocket wheel bracket according to claim 2, characterized in that: The fixing mechanism (7) comprises a rotating rod (701), the rotating rod (701) being rotatably connected to the inside of a groove of the left group of locking blocks (2), the height of the lower surface of the rotating rod (701) being parallel to the height of the upper surfaces of the two groups of fixing plates (301), the upper surface of the rotating rod (701) being provided with a groove, the groove of the rotating rod (701) being inserted with a latch (702), the upper surface of the right group of locking blocks (2) being provided with a groove, the position of the groove of the right group of locking blocks (2) being located on the moving path of the latch (702).

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