Suspended chain conveyor

Abstract

The utility model belongs to the technical field of catenary conveyors, and particularly relates to a catenary conveyor which comprises a suspension device, a conveying guide rail fixedly installed at the bottom of the suspension device, a conveying chain arranged in the conveying guide rail, a sliding block fixedly installed on the conveying chain, and a plurality of connecting chains fixedly installed at the lower end of the sliding block and penetrating through the conveying guide rail. Connecting columns are fixedly mounted at the bottoms of the connecting chains, sliding grooves are formed in the sliding blocks, rotating discs and rotating columns are rotatably mounted in the sliding grooves, a plurality of damping rods are fixedly mounted between the rotating discs and the rotating columns, and springs sleeve the damping rods; when the whole device is used, a worker can conveniently mount and dismount the base, tools are not needed, operation is easy, meanwhile, when the base moves downwards, the speed is not too high, and electrolyte anode scraps on the base cannot violently shake and fall off.

Description

Technical Field

[0001] The utility model belongs to the technical field of suspension chain conveyors, and particularly relates to a suspension chain conveyor. Background Art

[0002] The suspension chain conveyor is an important type of conveyor. The ancient Chinese high-turning barrel waterwheel and the tipping bucket for water lifting are the prototypes of modern bucket elevators and scraper conveyors; in the mid-17th century, aerial ropeways began to be used to transport bulk materials; in the mid-19th century, various modern-structured conveyors emerged one after another.

[0003] For example, the Chinese patent with the publication number CN214140135U discloses a suspension chain conveyor, which includes two symmetrically arranged support columns. One end of the two support columns is fixedly connected together with a top plate. A rotating motor is fixedly connected to a side wall of the top plate away from the support columns. The rotating motor is arranged close to one of the support columns. The output end of the rotating motor faces the top plate. A driving shaft is arranged on the output end of the rotating motor. The end of the driving shaft away from the rotating motor penetrates through the top plate. A rotating groove is arranged on a side wall of the top plate close to the support columns. The utility model ensures the stability of the hanging and conveying work of the conveying chain and facilitates the user to complete the conveying work of products of different sizes, greatly ensuring the safety of the conveying work while meeting the different work requirements of the user.

[0004] The above patent has the following problems:

[0005] When the above patent is in use, there are some disadvantages. For example, when the suspension chain conveyor conveys electrolyte stubs, since the lifting height needs to be adjusted, and currently it is generally directly connected by a chain to facilitate lifting, this often causes violent shaking during the lifting process. This shaking not only affects the stability of the conveying, but also may cause the electrolyte stubs to fall off, and then additional time and resources are required to collect and reprocess them, resulting in waste. At the same time, the base on the suspension chain conveyor for supporting the electrolyte stubs is prone to damage due to wear or corrosion after long-term use. However, the existing base design is usually an integrally formed structure with the connecting rod, which makes the replacement of the base complicated and time-consuming because the entire connection structure needs to be disassembled and reinstalled. In view of this, we propose a suspension chain conveyor. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a suspension chain conveyor to solve the problems raised in the above background art.

[0007] In view of this, the utility model provides a suspension chain conveyor, including:

[0008] Suspension device, a conveying guide rail is fixedly installed at the bottom of the suspension device, a conveying chain is arranged in the conveying guide rail, a sliding block is fixedly installed on the conveying chain, the lower end of the sliding block penetrates through the conveying guide rail and fixedly installs a plurality of connecting chains, and the sliding block is slidably connected with the conveying guide rail. The bottom of the plurality of connecting chains is fixedly installed with a connecting column. A sliding groove is formed in the sliding block, a rotating disk and a rotating column are rotatably installed in the sliding groove, a plurality of damping rods are fixedly installed between the rotating disk and the rotating column, springs are sleeved on the plurality of damping rods, and the lower end of the rotating column penetrates through the sliding groove and is fixedly connected with the connecting column;

[0009] Base, the base is arranged at the bottom of the connecting column, and a limiting groove is formed in the base. A rectangular block fixed to the connecting column is inserted and installed in the limiting groove. A first power cavity is formed in the rectangular block, two sliding plates are slidably installed in the first power cavity, and both of the two sliding plates are inserted and matched with the limiting groove;

[0010] Drive assembly, the drive assembly is located in the rectangular block and is used to drive the two sliding plates to slide.

[0011] In this technical solution, when the base needs to be replaced, through the arranged drive assembly, the two sliding plates can be driven to slide and approach each other, so that both of the two sliding plates are disengaged from the limiting groove. At this time, the connecting column can be taken out upward, and the connecting column drives the rectangular block to be taken out upward, completing the disassembly of the base. Through the above reverse operation, the base can be installed at the bottom of the connecting column, which is convenient for personnel to install and disassemble the base, and no tools are required, and the operation is simple;

[0012] When the base is pushed upward and displaced, the base drives the connecting column to move upward, the connecting column drives the rotating column and a plurality of connecting chains to move upward. At the same time, a plurality of damping rods and a plurality of springs are compressed and contracted. The plurality of damping rods can buffer the displacement of the rotating column, so that the rotating column slowly rises. When the base is no longer pushed, under the action of the rebound force and gravity of the plurality of springs, the rotating column moves downward and drives the plurality of damping rods to slowly extend downward. Under the action of the plurality of damping rods, the speed of the rotating column is relatively gentle during the downward displacement process, so that when the base moves downward, the speed will not be too fast, and the electrolyte residual anode on the base will not shake violently and fall off.

[0013] In the above technical solution, further, the drive assembly includes:

[0014] Worm gear, the worm gear is rotatably installed in the first power cavity and is located between the two sliding plates. Both ends of the worm gear are fixedly installed with threaded rods. The mutually remote ends of the two threaded rods respectively penetrate through the two sliding plates. The thread directions of the two threaded rods are opposite, and the two threaded rods are respectively threadedly connected with the two sliding plates. Both of the two threaded rods are rotatably connected with the first power cavity;

[0015] A worm, the worm is meshed and installed on one side of a worm wheel, and the worm is rotatably connected to a power chamber one. A driving chamber is provided in the connecting column. The upper end of the worm extends into the driving chamber and is fixedly installed with a first bevel gear. A second bevel gear is meshed and installed on one side of the first bevel gear. One end of the second bevel gear penetrates through the driving chamber and extends to the outside. The second bevel gear, the first bevel gear and the worm are all rotatably connected to the driving chamber.

[0016] In this technical solution, when the base needs to be replaced, first rotate the second bevel gear. The second bevel gear drives the first bevel gear meshed with it to rotate. The first bevel gear drives the worm to rotate. The worm drives the worm wheel meshed with it to rotate. The worm wheel drives two threaded rods to rotate. Under the action of the threads, the two threaded rods drive two sliding plates to slide and approach each other respectively, so that both sliding plates disengage from the limiting grooves. At this time, the connecting column can be taken out upward. The connecting column drives the rectangular block to be taken out upward, completing the disassembly of the base. Through the above reverse operation, the base can be installed at the bottom of the connecting column, which is convenient for personnel to install and disassemble the base, and no tools are required, and the operation is simple.

[0017] In the above technical solution, further, an operating rod is fixedly installed at one end of the second bevel gear.

[0018] In this technical solution, the operating rod provided facilitates personnel to rotate the second bevel gear.

[0019] In the above technical solution, further, several damping rods are distributed at equal intervals in a ring shape.

[0020] In this technical solution, under the action of several damping rods, the rotating column moves downward at a relatively gentle speed, so that when the base moves downward, the speed will not be too fast, and the electrolyte residue on the base will not shake violently and fall off.

[0021] In the above technical solution, further, both ends of several springs are fixed to the rotating disc and the rotating column respectively.

[0022] In this technical solution, the stability of several springs during use is ensured.

[0023] In the above technical solution, further, the connecting column and the rectangular block are of an integrally formed structure, and several connecting chains are respectively located at the four corners of the sliding block.

[0024] In this technical solution, the stability of the connecting column and the rectangular block during use is ensured, and it is ensured that the connecting column will not tilt during displacement.

[0025] The beneficial effects of the present utility model are:

[0026] 1. For this catenary conveyor, when the base needs to be replaced, the driving assembly can drive the two sliding plates to slide and approach each other, causing both sliding plates to disengage from the limiting grooves. At this time, the connecting column can be taken out upward, and the connecting column drives the rectangular block to be taken out upward, completing the disassembly of the base. Through the above reverse operation, the base can be installed at the bottom of the connecting column, facilitating the installation and disassembly of the base by personnel without the need for tools and with simple operation.

[0027] 2. For this catenary conveyor, when the base is pushed upward and displaced, the base drives the connecting column to move upward, and the connecting column drives the rotating column and several connecting chains to move upward. At the same time, several damping rods and several springs are compressed and contracted. The several damping rods can buffer the displacement of the rotating column, causing the rotating column to rise slowly. When the base is no longer pushed, under the action of the rebound force of several springs and gravity, the rotating column moves downward and drives several damping rods to slowly extend downward. Under the action of several damping rods, the speed of the rotating column is relatively gentle during the downward displacement, so that when the base moves downward, the speed will not be too fast, and the electrolyte residual anodes on the base will not shake violently and fall off. Description of the Drawings

[0028] Figure 1 is the overall structural schematic diagram of the present utility model;

[0029] Figure 2 is the sectional structural schematic diagram of the sliding block of the present utility model;

[0030] Figure 3 is the sectional structural schematic diagram of the connecting column of the present utility model;

[0031] Figure 4 is one of the sectional structural schematic diagrams of the base of the present utility model;

[0032] Figure 5 is the other sectional structural schematic diagram of the base of the present utility model;

[0033] Figure 6 is the sectional structural schematic diagram of the rectangular block of the present utility model;

[0034] Figure 7 is the structural schematic diagram of the worm gear area of the present utility model.

[0035] The markings in the figures are shown as:

[0036] 1. Suspension device; 2. Conveyor guide rail; 3. Conveyor chain; 4. Slide block; 5. Connecting chain; 6. Connecting column; 7. Slide groove; 8. Rotating disk; 9. Rotating column; 10. Damping rod; 11. Spring; 12. Base; 13. Limiting groove; 14. Rectangular block; 15. First power chamber; 16. Slide plate; 17. Worm gear; 18. Threaded rod; 19. Worm; 20. Driving chamber; 21. First bevel gear; 22. Second bevel gear; 23. Operating rod. Detailed implementation manner

[0037] The following will clearly describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms used here are only for describing specific implementation manners, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0040] It should be noted that in the description of the present application, the orientation or positional relationship indicated by the orientation terms such as "front, back, top, bottom, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0041] It should be noted that in the present application, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0042] Embodiment 1:

[0043] Please refer to Figure 1 - Figure 7 As shown in the figure, this embodiment provides a catenary conveyor, including:

[0044] A suspension device 1, a conveying guide rail 2 is fixedly installed at the bottom of the suspension device 1, a conveying chain 3 is arranged in the conveying guide rail 2, a sliding block 4 is fixedly installed on the conveying chain 3, the lower end of the sliding block 4 penetrates through the conveying guide rail 2 and fixedly installs a number of connecting chains 5, and the sliding block 4 is slidably connected with the conveying guide rail 2. The bottom of the number of connecting chains 5 is fixedly installed with a connecting column 6. A sliding groove 7 is opened in the sliding block 4, a rotating disk 8 and a rotating column 9 are rotatably installed in the sliding groove 7. A number of damping rods 10 are fixedly installed between the rotating disk 8 and the rotating column 9. Springs 11 are sleeved on the number of damping rods 10. The lower end of the rotating column 9 penetrates through the sliding groove 7 and is fixedly connected with the connecting column 6;

[0045] Base 12 is provided at the bottom of connecting column 6, and a limiting groove 13 is formed in base 12. A rectangular block 14 fixed to connecting column 6 is inserted and installed in limiting groove 13. A first power chamber 15 is formed in rectangular block 14. Two sliding plates 16 are slidably installed in first power chamber 15. Both of the two sliding plates 16 are inserted and cooperated with limiting groove 13.

[0046] A driving assembly is located in rectangular block 14 and is used to drive the sliding of the two sliding plates 16.

[0047] Among them, when it is necessary to replace base 12, the driving assembly can drive the two sliding plates 16 to slide and approach each other, so that both of the two sliding plates 16 are disengaged from limiting groove 13. At this time, connecting column 6 can be taken out upward, and connecting column 6 drives rectangular block 14 to be taken out upward, completing the disassembly of base 12. Through the above reverse operation, base 12 can be installed at the bottom of connecting column 6, which is convenient for personnel to install and disassemble base 12, and no tools are required, and the operation is simple.

[0048] When base 12 is pushed upward and displaced, base 12 drives connecting column 6 to be displaced upward. Connecting column 6 drives rotating column 9 and several connecting chains 5 to be displaced upward. At the same time, several damping rods 10 and several springs 11 are all squeezed and contracted. Several damping rods 10 can buffer the displacement of rotating column 9, so that rotating column 9 rises slowly. When base 12 is no longer pushed, under the action of the elastic force and gravity of several springs 11, rotating column 9 is displaced downward and drives several damping rods 10 to slowly elongate downward. Under the action of several damping rods 10, the speed of rotating column 9 is relatively gentle during the downward displacement process, so that when base 12 is displaced downward, the speed will not be too fast, and the electrolyte residual anode on base 12 will not shake violently and fall off.

[0049] In this embodiment, the driving assembly includes:

[0050] A worm gear 17 is rotatably installed in the first power chamber 15 and is located between the two sliding plates 16. Both ends of worm gear 17 are fixedly installed with threaded rods 18. The mutually remote ends of the two threaded rods 18 respectively penetrate through the two sliding plates 16. The thread directions of the two threaded rods 18 are opposite, and the two threaded rods 18 are respectively threadedly connected with the two sliding plates 16. Both of the two threaded rods 18 are rotatably connected with the first power chamber 15.

[0051] The worm 19 is meshed and installed on one side of the worm wheel 17, and the worm 19 is rotatably connected to the power chamber one 15. A driving chamber 20 is provided in the connecting column 6. The upper end of the worm 19 extends into the driving chamber 20 and is fixedly installed with a first bevel gear 21. A second bevel gear 22 is meshed and installed on one side of the first bevel gear 21. One end of the second bevel gear 22 penetrates through the driving chamber 20 and extends to the outside. The second bevel gear 22, the first bevel gear 21 and the worm 19 are all rotatably connected to the driving chamber 20;

[0052] Among them, when the base 12 needs to be replaced, first rotate the second bevel gear 22. The second bevel gear 22 drives the first bevel gear 21 meshed with it to rotate. The first bevel gear 21 drives the worm 19 to rotate. The worm 19 drives the worm wheel 17 meshed with it to rotate. The worm wheel 17 drives the two threaded rods 18 to rotate. Under the action of the thread, the two threaded rods 18 drive the two sliding plates 16 to slide and approach each other respectively, so that the two sliding plates 16 are disengaged from the limiting grooves 13. At this time, the connecting column 6 can be taken out upward. The connecting column 6 drives the rectangular block 14 to be taken out upward, completing the disassembly of the base 12. Through the above reverse operation, the base 12 can be installed at the bottom of the connecting column 6, which is convenient for personnel to install and disassemble the base 12, and no tools are required, and the operation is simple.

[0053] Embodiment 2:

[0054] This embodiment provides a suspension conveyor. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0055] In this embodiment, an operating rod 23 is fixedly installed at one end of the second bevel gear 22.

[0056] Among them, the operating rod 23 provided facilitates personnel to rotate the second bevel gear 22.

[0057] Embodiment 3:

[0058] This embodiment provides a suspension conveyor. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0059] In this embodiment, a plurality of damping rods 10 are distributed at equal intervals in a ring shape.

[0060] Among them, under the action of the plurality of damping rods 10, the rotating column 9 moves downward at a relatively gentle speed. When the base 12 moves downward, the speed will not be too fast, and the electrolyte residue on the base 12 will not shake violently and fall off.

[0061] Embodiment 4:

[0062] This embodiment provides a suspension conveyor. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0063] In this embodiment, both ends of several springs 11 are respectively fixed to the rotating disk 8 and the rotating column 9.

[0064] Among them, the stability of several springs 11 during use is ensured.

[0065] Embodiment 5:

[0066] This embodiment provides a catenary conveyor. In addition to including the technical solutions of the above embodiments, it also has the following technical features.

[0067] In this embodiment, the connecting column 6 and the rectangular block 14 are of an integrally formed structure, and several connecting chains 5 are respectively located at the four corners of the sliding block 4.

[0068] Among them, the stability of the connecting column 6 and the rectangular block 14 during use is ensured, and it is ensured that the connecting column 6 will not tilt during displacement.

[0069] At the same time, the catenary conveying structure and principle of this embodiment are both prior arts. For details, reference can be made to the comparative document (publication number: CN214140135U, patent name: a hanging chain conveyor), which will not be elaborated here.

[0070] Working principle: When the base 12 needs to be replaced, first rotate the operating rod 23 to drive the second bevel gear 22 to rotate. The second bevel gear 22 drives the first bevel gear 21 meshing with it to rotate. The first bevel gear 21 drives the worm 19 to rotate. The worm 19 drives the worm gear 17 meshing with it to rotate. The worm gear 17 drives two threaded rods 18 to rotate. Under the action of the thread, the two threaded rods 18 respectively drive the two sliding plates 16 to slide and approach each other, so that both sliding plates 16 disengage from the limiting grooves 13. At this time, the connecting column 6 can be taken out upward. The connecting column 6 drives the rectangular block 14 to be taken out upward, completing the disassembly of the base 12. Through the above reverse operation, the base 12 can be installed at the bottom of the connecting column 6, which is convenient for personnel to install and disassemble the base 12 and does not require tools, and the operation is simple.

[0071] When the base 12 is pushed upward for displacement, the base 12 drives the connecting column 6 to move upward. The connecting column 6 drives the rotating column 9 and several connecting chains 5 to move upward. At the same time, several damping rods 10 and several springs 11 are both compressed and contracted. The several damping rods 10 can buffer the displacement of the rotating column 9, so that the rotating column 9 rises slowly. When the base 12 is no longer pushed, under the action of the rebounding force and gravity of the several springs 11, the rotating column 9 moves downward and drives the several damping rods 10 to slowly extend downward. Under the action of the several damping rods 10, the speed of the rotating column 9 is relatively gentle during the downward displacement, so that when the base 12 moves downward, the speed will not be too fast, and the electrolyte residues on the base 12 will not shake violently and fall off.

[0072] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the specific implementation manners described above. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A catenary conveyor, characterized in that: include: A suspension device (1), wherein a conveying guide rail (2) is fixedly installed at the bottom of the suspension device (1), a conveying chain (3) is arranged in the conveying guide rail (2), a sliding block (4) is fixedly installed on the conveying chain (3), the lower end of the sliding block (4) passes through the conveying guide rail (2) and is fixedly installed with a plurality of connecting chains (5), and the sliding block (4) is slidably connected to the conveying guide rail (2), and a connecting column (6) is fixedly installed at the bottom of the plurality of connecting chains (5), a sliding groove (7) is provided in the sliding block (4), a rotating disk (8) and a rotating column (9) are rotatably installed in the sliding groove (7), a plurality of damping rods (10) are fixedly installed between the rotating disk (8) and the rotating column (9), and a spring (11) is sleeved on the plurality of damping rods (10), and the lower end of the rotating column (9) passes through the sliding groove (7) and is fixedly connected to the connecting column (6); A base (12), the base (12) is arranged at the bottom of the connecting column (6), and a limiting groove (13) is provided in the base (12), a rectangular block (14) fixed to the connecting column (6) is inserted and installed in the limiting groove (13), a power cavity (15) is provided in the rectangular block (14), two sliding plates (16) are slidably installed in the power cavity (15), and the two sliding plates (16) are both inserted and matched with the limiting groove (13); A driving assembly is located in the rectangular block (14) and is used to drive the two sliding plates (16) to slide.

2. A catenary conveyor according to claim 1, characterized in that: The drive assembly comprises: A worm wheel (17), the worm wheel (17) is rotatably mounted in the power chamber (15) and is located between the two sliding plates (16), threaded rods (18) are fixedly mounted at both ends of the worm wheel (17), the ends of the two threaded rods (18) that are away from each other respectively penetrate the two sliding plates (16), the threads on the two threaded rods (18) are in opposite directions, and the two threaded rods (18) are respectively threadedly connected to the two sliding plates (16), and the two threaded rods (18) are both rotatably connected to the power chamber (15); A worm (19) is meshedly mounted on one side of the worm wheel (17), and the worm (19) is rotationally connected to the power chamber (15). A driving chamber (20) is provided in the connecting column (6). The upper end of the worm (19) extends into the driving chamber (20) and is fixedly mounted with a bevel gear (21). A bevel gear (22) is meshedly mounted on one side of the bevel gear (21). One end of the bevel gear (22) passes through the driving chamber (20) and extends to the outside. The bevel gear (22), the bevel gear (21) and the worm (19) are all rotationally connected to the driving chamber (20).

3. A catenary conveyor according to claim 2, characterized in that: An operating rod (23) is fixedly mounted on one end of the bevel gear 2 (22).

4. A catenary conveyor according to claim 1, characterized in that: The plurality of damping rods (10) are distributed in a ring-like shape with equal spacing.

5. A catenary conveyor according to claim 1, characterized in that: The two ends of the plurality of springs (11) are respectively fixed to the rotating disk (8) and the rotating column (9).

6. A catenary conveyor according to claim 1, characterized in that: The connecting column (6) and the rectangular block (14) are an integrally formed structure.

7. A catenary conveyor according to claim 1, characterized in that: The plurality of connecting chains (5) are respectively located at the four corners of the sliding block (4).

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