Portal crane hook weighing device

Abstract

The application discloses a portal crane hook weighing device, which comprises a main unit and a stabilizing unit. The main unit comprises a support, a connecting block arranged on the lower surface of the support, a first fixing plate arranged on the lower surface of the connecting block, a hydraulic rod arranged on the lower surface of the first fixing plate, a second fixing plate arranged on the lower surface of the hydraulic rod, a hanging plate arranged on the lower surface of the second fixing plate, a gravity sensor arranged on the lower surface of the hanging plate, and a hook arranged on the lower surface of the gravity sensor. The stabilizing unit comprises a motor arranged on the upper surface of the gravity sensor and fixedly connected with the hanging plate. The beneficial effects of the application are as follows: the mutual cooperation between the structures can effectively stabilize and assist the hoisted object, and the stable structure can be conveniently adjusted, so that the device can be applied to objects of various shapes during use, and the application range of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of gantry crane hook technology, and more particularly to a gantry crane hook weighing device. Background Technology

[0002] A gantry crane hook weighing device is a type of equipment used on gantry cranes to measure and display the weight of the lifted object. It consists of a load cell, a digital display screen, and a control system. Based on its working principle, it is divided into two types: electronic and mechanical. Its function is to ensure weight control of the lifted object and safe operation, preventing overloading and accidents.

[0003] However, some existing gantry crane hook weighing devices may experience swaying during the lifting process due to the monotony of the hook. This swaying can cause the hook's weighing sensor to malfunction, rendering the device unusable. Furthermore, some devices are only suitable for regular objects, making them unsuitable for objects with unequal lengths and widths on both sides, thus limiting the device's application range. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems that some of the aforementioned gantry crane hook weighing devices may experience swaying during the lifting process due to the monotony of the hook, which can cause the weighing sensor of the hook to malfunction and render the device unusable, and the fact that some devices are only suitable for regular objects and cannot be used for objects with unequal lengths and widths on both sides, thus limiting the scope of application of the device, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a gantry crane hook weighing device.

[0007] This invention provides the following technical solution: a gantry crane hook weighing device, comprising:

[0008] The main unit includes a bracket, a connecting block disposed on the lower surface of the bracket, a first fixing plate disposed on the lower surface of the connecting block, a hydraulic rod disposed on the lower surface of the first fixing plate, a second fixing plate disposed on the lower surface of the hydraulic rod, a hanging plate disposed on the lower surface of the second fixing plate, a gravity sensor disposed on the lower surface of the hanging plate, and a rotating hook disposed on the lower surface of the gravity sensor.

[0009] The stabilizing unit includes a motor fixedly connected to the upper surface of the gravity sensor and the hanging plate, a telescopic shaft at the output end of the motor, a first locking plate on the upper surface of the telescopic shaft, a second locking plate on the upper surface of the first locking plate, an electric push rod fixedly connected to the upper surface of the second locking plate and the second fixed plate, a first fixing ring slidably connected to the second locking plate on the lower surface of the second fixed plate, a first circular ring slidably connected to the first locking plate on the lower surface of the first fixing ring, a second gear on the outer surface of the first circular ring, a second circular ring on the lower surface of the first circular ring, and a first gear on the outer surface of the second circular ring. The gear, a plurality of adjusting plates slidably connected by tooth grooves on the outer surface of the first gear or the second gear, a stabilizing plate slidably connected on the outer surface of the adjusting plate, a long shaft slidably connected to the adjusting plate on the outer surface of the stabilizing plate near the telescopic shaft, a plurality of second fixing rings slidably connected to the adjusting plate on the outer surface of the long shaft, a spring slidably connected to the adjusting plate between two second fixing rings, a first connecting plate on the outer surface of the stabilizing plate away from the telescopic shaft, a pressing plate on the lower surface of the first connecting plate, and a clamping plate on the outer surface of the first connecting plate near the telescopic shaft located below the stabilizing plate;

[0010] The inner surface of the hanging plate is provided with an auxiliary unit, and the inner surface of the first fixed plate is provided with a sliding unit.

[0011] As a preferred embodiment of the gantry crane hook weighing device of the present invention, the lower surface of the lifting plate is provided with a slot that matches the card plate, the inner surface of the lifting plate is provided with anti-slip stripes between it and the stabilizing plate, the first card plate and the second card plate are both octagonal in shape, and the upper and lower surfaces of the first card plate and the second card plate are provided with rounded corners.

[0012] As a preferred embodiment of the gantry crane hook weighing device of the present invention, the auxiliary unit includes a sliding groove disposed on the inner surface of the lifting plate and matching the stabilizing plate, and a protective plate disposed on the outer surface of the second clamping plate near the telescopic shaft.

[0013] As a preferred embodiment of the gantry crane hook weighing device of the present invention, the auxiliary unit further includes a limiting plate disposed on the inner surface of the stabilizing plate and slidably connected to the adjusting plate, and a striped groove disposed on the upper surface of the adjusting plate and matching the limiting plate.

[0014] As a preferred embodiment of the gantry crane hook weighing device of the present invention, the sliding unit includes: a second connecting plate disposed on the upper surface of the first connecting plate; a connecting rod disposed on the inner surface of the second connecting plate and located on the upper surface of the first connecting plate; a third ring disposed on the outer surface of the connecting rod and located on the upper surface of the first connecting plate; a plurality of screws disposed on the upper surface of the second connecting plate and threadedly connected to the first connecting plate; an outer sliding plate disposed on the outer surface of the connecting rod and slidably connected to the connecting block and located on the left side of the connecting block; and an inner sliding plate disposed on the inner surface of the outer sliding plate and slidably connected to the right connecting rod.

[0015] As a preferred embodiment of the gantry crane hook weighing device of the present invention, anti-slip stripes are provided between the inner and outer sliding plates, and anti-slip liquid is applied between the connecting rod and the inner or outer sliding plates.

[0016] As a preferred embodiment of the gantry crane hook weighing device of the present invention, the sliding unit further includes a cleaning brush disposed on the upper surface of the inner or outer sliding plate and rotatably connected by a shaft, and a rubber rope disposed between the two cleaning brushes.

[0017] As a preferred embodiment of the gantry crane hook weighing device of the present invention, the sliding unit further includes a protective frame disposed on the outer surface of the connecting block and slidably connected to the inner and outer sliding plates, and the inner surface of the connecting block is provided with a groove that matches the inner or outer sliding plate.

[0018] The beneficial effects of this invention are:

[0019] 1. The interoperability of the structures can effectively stabilize the suspended object, and the stable structure can be easily adjusted, making the device applicable to objects of various shapes, thus expanding its scope of application.

[0020] 2. Through the cooperation between the structures, the surface of the suspended object and the surface of the fixed structure can be protected, thereby reducing the damage rate of the structure, saving resources, and assisting the stable operation of the moving structure, thus maintaining the normal operation of the device.

[0021] 3. The movement of the structure is assisted by the mutual cooperation between the structures. At the same time, when the stabilizing unit plays a role in suspending the object, the sliding unit maintains stability between the stabilizing unit and the object, thereby enhancing the effect of the stabilizing unit during operation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0023] Figure 1 This is a three-dimensional structural schematic diagram of a gantry crane hook weighing device according to the present invention.

[0024] Figure 2 This is a schematic diagram of the disassembled structure of the lifting plate of the gantry crane hook weighing device of the present invention.

[0025] Figure 3 This is a three-dimensional schematic diagram of the stabilization unit of a gantry crane hook weighing device according to the present invention.

[0026] Figure 4 This is a schematic diagram of the internal structure of the stabilizing unit of a gantry crane hook weighing device according to the present invention.

[0027] Figure 5 This is a three-dimensional structural diagram of the sliding unit of a gantry crane hook weighing device according to the present invention.

[0028] Figure 6 This is a right-side oblique section schematic diagram of the lifting plate of the gantry crane hook weighing device of the present invention.

[0029] Figure 7 This invention relates to a gantry crane hook weighing device. Figure 6 Enlarged structural diagram at point A in the middle.

[0030] Figure 8 This is a schematic diagram of the three-dimensional connection structure of the lifting plate of the gantry crane hook weighing device according to the present invention.

[0031] Figure Descriptions: 100. Main body unit; 101. Bracket; 102. Connecting block; 103. First fixing plate; 104. Hanging plate; 105. Gravity sensor; 106. Hook; 107. Hydraulic rod; 108. Second fixing plate; 200. Stabilizing unit; 201. Motor; 202. Telescopic shaft; 203. First clamping plate; 204. Second clamping plate; 205. Electric push rod; 206. First fixing ring; 207. First circular ring; 208. Second circular ring; 209. First gear; 210. Second gear; 211. Adjustment... 212. Section plate; 213. Stabilizing plate; 214. First connecting plate; 215. Extrusion plate; 216. Clamping plate; 217. Long shaft; 218. Second fixing ring; 219. Spring; 300. Auxiliary unit; 301. Slide groove; 302. Limiting plate; 303. Limiting groove; 304. Protective plate; 400. Sliding unit; 401. Second connecting plate; 402. Screw; 403. Inner sliding plate; 404. Outer sliding plate; 405. Cleaning brush; 406. Rubber rope; 407. Protective frame; 408. Connecting rod; 409. Third ring. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0035] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0036] Example 1

[0037] A gantry crane hook weighing device, comprising:

[0038] The main unit 100 includes a bracket 101, a connecting block 102 disposed on the lower surface of the bracket 101, a first fixing plate 103 disposed on the lower surface of the connecting block 102, a hydraulic rod 107 disposed on the lower surface of the first fixing plate 103, a second fixing plate 108 disposed on the lower surface of the hydraulic rod 107, a hanging plate 104 disposed on the lower surface of the second fixing plate 108, a gravity sensor 105 disposed on the lower surface of the hanging plate 104, and a hook 106 disposed on the lower surface of the gravity sensor 105.

[0039] The stabilizing unit 200 includes a motor 201 fixedly connected to the upper surface of the gravity sensor 105 and the hanging plate 104, a telescopic shaft 202 located at the output end of the motor 201, a first clamping plate 203 located on the upper surface of the telescopic shaft 202, a second clamping plate 204 located on the upper surface of the first clamping plate 203, an electric push rod 205 fixedly connected to the upper surface of the second clamping plate 204 and the second fixed plate 108, a first fixing ring 206 slidably connected to the second clamping plate 204 located on the lower surface of the second fixed plate 108, a first circular ring 207 slidably connected to the first clamping plate 203 located on the lower surface of the first fixing ring 206, a second gear 210 located on the outer surface of the first circular ring 207, a second circular ring 208 located on the lower surface of the first circular ring 207, and a first gear 210 located on the outer surface of the second circular ring 208. 09. A plurality of adjusting plates 211 slidably connected by tooth grooves on the outer surface of the first gear 209 or the second gear 210; a stabilizing plate 212 slidably connected on the outer surface of the adjusting plate 211; a long shaft 216 slidably connected to the adjusting plate 211 on the outer surface of the stabilizing plate 212 near the telescopic shaft 202; a plurality of second fixing rings 217 slidably connected to the adjusting plate 211 on the outer surface of the long shaft 216; a spring 218 slidably connected to the adjusting plate 211 between the two second fixing rings 217; a first connecting plate 213 on the outer surface of the stabilizing plate 212 away from the telescopic shaft 202; a pressing plate 214 on the lower surface of the first connecting plate 213; and a clamping plate 215 on the outer surface of the first connecting plate 213 near the telescopic shaft 202 and located below the stabilizing plate 212.

[0040] The inner surface of the hanging plate 104 is provided with an auxiliary unit 300, and the inner surface of the first fixed plate 103 is provided with a sliding unit 400.

[0041] Preferably, the lower surface of the hanging plate 104 is provided with a slot that matches the card plate 215, and anti-slip stripes are provided between the inner surface of the hanging plate 104 and the stabilizing plate 212. The first card plate 203 and the second card plate 204 are both octagonal in shape, and the upper and lower surfaces of the first card plate 203 and the second card plate 204 are provided with rounded corners.

[0042] Specifically, when using this device, the connecting block 102 controls the first fixed plate 103 to move downwards via the control device of the bracket 101. Then, the hydraulic rod 107 drives the hanging plate 104 under the second fixed plate 108 to move downwards for fine adjustment. Then, the starting motor 201 drives the telescopic shaft 202 to rotate, which in turn drives the first clamping plate 203 to rotate. The first clamping plate 203 drives the first ring 207 to rotate, which in turn drives the second gear 210 to rotate. The second gear 210 then drives the upper adjusting plate 211 and the stabilizing plate 212 to move downwards. Move the object away from the telescopic shaft 202, adjust the corner of the two first connecting plates 213, and then drive the second clamping plate 204 downward via the electric push rod 205. This causes the second clamping plate 204 to drive the first clamping plate 203 downward, so that the first clamping plate 203 is completely inside the second ring 208. Under the action of the telescopic shaft 202 and the first clamping plate 203, the motor 201 drives the second ring 208 to rotate, moving the lower adjusting plate 211 and stabilizing plate 212 to the opposite corner of the object. This connects the gravity sensor 105 and the hook 106 with the object. When the first connecting plate 213 and the pressing plate 214 are below the highest point of the object, the motor 201 drives the adjusting plate 211 and the stabilizing plate 212 to stabilize the object and fix it in place, preventing it from swaying when moving upwards. This improves the accuracy of the weighing hook. A long shaft 216, a second fixing ring 217, and a spring 218 are provided between the adjusting plate 211 and the stabilizing plate 212, allowing the adjusting plate 211 and the stabilizing plate 212 to separate by a certain length. This allows for adjustment of the length between the two relatively stable pressing plates 214. Adjustable for weighing more irregularly shaped objects, one of the second fixing rings 217 and one spring 218 form a pair. The inside of the hanging plate 104 has multiple grooves that match the pair of second fixing rings 217 and springs 218, so that the pulling force after the combination of the second rings 208 is stronger and the stability of the object is improved. Through the cooperation between the structures, the suspended object can be effectively stabilized and assisted. At the same time, it is convenient to adjust the stable structure, so that the device can be used for objects of various shapes, thus improving the applicability of the device.

[0043] Example 2

[0044] A gantry crane hook weighing device, based on embodiment 1, includes an auxiliary unit 300 comprising a groove 301 on the inner surface of the lifting plate 104 that matches the stabilizing plate 212, and a protective plate 304 on the outer surface of the second clamping plate 204 near the telescopic shaft 202.

[0045] Preferably, the auxiliary unit 300 further includes a limiting plate 302 disposed on the inner surface of the stabilizing plate 212 and slidably connected to the adjusting plate 211, and a striped groove disposed on the upper surface of the adjusting plate 211 and matching the limiting plate 302.

[0046] Specifically, during the use of the device, the protective plate 304 protects the surface of the object and the inner surface of the extrusion plate 214, reducing scratches on the object during the inspection process and thus protecting the appearance of the object and the inspection device. The limiting plate 302 limits the length of the adjustment plate 211 during movement, preventing the adjustment plate 211 from separating from the stabilizing plate 212. The limiting plate 302 sliding inside the limiting groove 303 enhances the limiting effect. The protective plate 304 maintains the stability of the stabilizing plate 212 when it moves inside the hanging plate 104. Through the cooperation between the structures, the surface of the suspended object and the surface of the fixed structure can be protected, thereby reducing the structural wear rate, saving resources, and assisting the stable operation of the moving structure, thus maintaining the normal operation of the device.

[0047] Example 3

[0048] A gantry crane hook weighing device, based on embodiment 1, includes a sliding unit 400 comprising a second connecting plate 401 disposed on the upper surface of a first connecting plate 213, a connecting rod 408 disposed on the inner surface of the second connecting plate 401 and located on the upper surface of the first connecting plate 213, a third ring 409 disposed on the outer surface of the connecting rod 408 and located on the upper surface of the first connecting plate 213, a plurality of screws 402 disposed on the upper surface of the second connecting plate 401 and threadedly connected to the first connecting plate 213, an outer sliding plate 404 disposed on the outer surface of the connecting rod 408 and slidably connected to a connecting block 102 and located on the left side of the connecting block 102, and an inner sliding plate 403 disposed on the inner surface of the outer sliding plate 404 and slidably connected to the right connecting rod 408.

[0049] Preferably, anti-slip stripes are provided between the inner slide plate 403 and the outer slide plate 404, and anti-slip liquid is applied between the connecting rod 408 and the inner slide plate 403 or between the connecting rod 408 and the outer slide plate 404.

[0050] Preferably, the sliding unit 400 further includes a cleaning brush 405 disposed on the upper surface of the inner sliding plate 403 or the outer sliding plate 404 and rotatably connected by a shaft, and a rubber rope 406 disposed between the two cleaning brushes 405.

[0051] Preferably, the sliding unit 400 further includes a protective frame 407 disposed on the outer surface of the connecting block 102 and slidably connected to the inner slide plate 403 and the outer slide plate 404, and the inner surface of the connecting block 102 is provided with a groove that matches the inner slide plate 403 or the outer slide plate 404.

[0052] Specifically, when the first connecting plate 213 moves outward, the second connecting plate 401 and the screw 402 work together, and the first gear 209 drives the second ring 208 to move synchronously. Then, the second ring 208 drives the inner sliding plate 403 and the outer sliding plate 404 to move synchronously on opposite sides, thereby maintaining the stability of the structure during operation. When the object is connected and lifted, the second ring 208 keeps the hanging plate 104 and the support 101 stable, thus effectively preventing the object from swaying during movement. The mutual cooperation between the structures assists the movement of the structure. At the same time, when the stabilizing unit plays a role in stabilizing the object being lifted, the sliding unit keeps the stabilizing unit stable, thereby enhancing the effect of the stabilizing unit during operation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hook weighing device for a portal crane, characterized in that The utility model relates to a kind of gravity sensor stabilizing device, including: Main unit (100), including support (101), the connecting block (102) of setting in the lower surface of the support (101), the first fixed plate (103) of setting in the lower surface of the connecting block (102), the hydraulic rod (107) of setting in the lower surface of the first fixed plate (103), the second fixed plate (108) of setting in the lower surface of the hydraulic rod (107), the hanging plate (104) of setting in the lower surface of the second fixed plate (108), the gravity sensor (105) of setting in the lower surface of the hanging plate (104), and the hook (106) of setting in the lower surface of the gravity sensor (105); Stable unit (200), including motor (201) being fixedly connected in the upper surface of the gravity sensor (105) with hanging plate (104), telescopic shaft (202) being arranged in the output end of the motor (201), first clamping plate (203) being arranged in the upper surface of the telescopic shaft (202), second clamping plate (204) being arranged in the upper surface of the first clamping plate (203), electric push rod (205) being fixedly connected in the upper surface of the second clamping plate (204) with second fixed plate (108), first fixed ring (206) being slidably connected in the lower surface of the second fixed plate (108) with second clamping plate (204), first circular ring (207) being slidably connected in the lower surface of the first fixed ring (206) with first clamping plate (203), second gear (210) being arranged in the outer surface of the first circular ring (207), second circular ring (208) being arranged in the lower surface of the first circular ring (207), first gear (209) being arranged in the outer surface of the second circular ring (208), a plurality of adjustment plates (211) being slidably connected by tooth slot in the outer surface of the first gear (209) or second gear (210), stable plate (212) being slidably connected in the outer surface of the adjustment plate (211), long shaft (216) being slidably connected in the outer surface of the stable plate (212) close to telescopic shaft (202) side, a plurality of second fixed ring (217) being slidably connected with adjustment plate (211) in the outer surface of the long shaft (216), and spring (218) being slidably connected with adjustment plate (211) between two the second fixed ring (217), first connecting plate (213) being arranged in the outer surface of the stable plate (212) away from telescopic shaft (202) side, extrusion plate (214) being arranged in the lower surface of the first connecting plate (213), and clamping plate (215) being arranged in the outer surface of the first connecting plate (213) close to telescopic shaft (202) side below stable plate (212). Wherein, the inner surface of the hanging plate (104) is provided with auxiliary unit (300), the inner surface of the first fixed plate (103) is provided with sliding unit (400).

2. A hook weighing device for a portal crane as claimed in claim 1, characterized in that The lower surface of the hanging plate (104) is provided with a clamping groove matched with the clamping plate (215), the inner surface of the hanging plate (104) and the stable plate (212) are provided with anti-skid stripes, the first clamping plate (203) and the second clamping plate (204) are both octagonal, and the upper and lower surfaces of the first clamping plate (203) and the second clamping plate (204) are both provided with rounded corners.

3. A hook weighing device for a portal crane as claimed in claim 1, characterized in that The auxiliary unit (300) comprises a sliding groove (301) arranged on the inner surface of the hanging plate (104) matched with the stable plate (212), and a protection plate (304) arranged on the outer surface of the second clamping plate (204) close to the telescopic shaft (202).

4. A hook weighing device for a portal crane as claimed in claim 3, characterized in that The auxiliary unit (300) further comprises a limiting plate (302) arranged on the inner surface of the stable plate (212) and slidingly connected with the adjusting plate (211), and a stripe clamping groove arranged on the upper surface of the adjusting plate (211) matched with the limiting plate (302).

5. A hook weighing device for a portal crane as claimed in claim 1, characterized in that The sliding unit (400) comprises a second connecting plate (401) arranged on the upper surface of the first connecting plate (213), a connecting rod (408) arranged on the inner surface of the second connecting plate (401) and located on the upper surface of the first connecting plate (213), a third circular ring (409) arranged on the outer surface of the connecting rod (408) and located on the upper surface of the first connecting plate (213), a plurality of screws (402) arranged on the upper surface of the second connecting plate (401) and threadedly connected with the first connecting plate (213), an outer sliding plate (404) arranged on the outer surface of the connecting rod (408) and slidingly connected with the connecting block (102) and located on the left side of the connecting block (102), and an inner sliding plate (403) arranged on the inner surface of the outer sliding plate (404) and slidingly connected with the right connecting rod (408).

6. A hook weighing device for a portal crane as claimed in claim 5, characterized in that Anti-skid stripes are arranged between the inner sliding plate (403) and the outer sliding plate (404), and anti-skid liquid is coated between the connecting rod (408) and the inner sliding plate (403) or between the connecting rod (408) and the outer sliding plate (404).

7. A hook weighing device for a portal crane as claimed in claim 5, characterized in that The sliding unit (400) further comprises a cleaning brush (405) arranged on the upper surface of the inner sliding plate (403) or the outer sliding plate (404) and rotationally connected through a shaft, and a rubber rope (406) arranged between the two cleaning brushes (405).

8. A hook weighing device for a portal crane as defined in claim 5, characterized in that The sliding unit (400) further comprises a protection frame (407) arranged on the outer surface of the connecting block (102) and slidingly connected with the inner sliding plate (403) and the outer sliding plate (404), and the inner surface of the connecting block (102) is provided with a sliding groove matched with the inner sliding plate (403) or the outer sliding plate (404).

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