Supporting device for coal mining

Abstract

The utility model relates to the technical field of coal mining, in particular to a supporting device for coal mining, which comprises a bottom plate, two side supporting plates, a connecting frame and a plurality of top supporting structures, the two side supporting plates respectively slide between the bottom plate and the connecting frame along the horizontal left-right direction, and the top supporting structures slide on the connecting frame along the horizontal front-back direction. And anti-overturning structures capable of supporting the side supporting plates are arranged at the joints of the bottom plate and the two side supporting plates correspondingly, anti-overturning structures are arranged at the joints of the connecting frame and the two side supporting plates correspondingly, and locking mechanisms are arranged on the anti-overturning structures. The problem that an existing supporting structure cannot stably support a roadway is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine mining, and specifically relates to a supporting device for coal mine mining. Background Technique

[0002] There are mainly two methods for coal mine mining, namely open-pit mining and underground mining. When mining underground, in order to ensure the safety of the underground structure and the surrounding environment, a supporting device is generally required to support the roadway.

[0003] In the prior art, for example, a supporting structure for coal mine mining proposed in a Chinese patent with the publication number of CN217783551U, by raising the lifting rod to lift the connecting cover, so that the connecting cover contacts the top surface of the roadway, so that the second protective shed can contact the top surface of the roadway. Since the folding plate is provided inside the second protective shed, for an irregular roadway, the folding plate can be closely attached, and the problem of loose attachment due to different heights of the two side lifting components will not occur. At the same time, the first protective shed is provided on the lower surface of the second protective shed, so that if the second protective shed is damaged, the falling gravel can be received by the first protective shed. The above-mentioned supporting structure uses a lifting rod to support the third protective shed, and the lifting rod is a hydraulic rod. However, since the hydraulic support equipment needs to be used in cooperation with a hydraulic system, it occupies a large area, and the space inside the roadway is relatively narrow. It is not only inconvenient to install and disassemble, but also its lifting rod is generally vertically arranged, mainly supporting the top of the roadway, and the supporting effect on the left and right side walls of the roadway is poor. If the left and right side walls of the roadway are deformed or collapsed, the lifting rod may tilt after receiving a lateral thrust, resulting in the overturning of the supporting structure and causing a safety accident. Content of the Utility Model

[0004] The utility model provides a supporting device for coal mine mining, which solves the problem of unstable support of the existing supporting structure for the roadway.

[0005] To achieve the above object, the utility model provides a supporting device for coal mine mining, including a bottom plate, side support plates, a connecting frame and a plurality of top support structures;

[0006] There are two side support plates, and the two side support plates slide horizontally between the bottom plate and the connecting frame respectively;

[0007] The top support structure slides horizontally on the connecting frame;

[0008] Anti-overturning structures capable of supporting the side support plates are respectively provided at the joints of the bottom plate and the two side support plates;

[0009] The anti-overturning structures are respectively provided at the joints of the connecting frame and the two side support plates;

[0010] A locking mechanism is provided on the anti-overturning structure.

[0011] Preferably, the anti-overturning structure includes reinforcing angle steels, a reinforcing middle plate, and two reinforcing side plates;

[0012] The vertical portion of the reinforcing angle steel is fixedly connected to the inner side wall of the side support plate. The horizontal portion of the reinforcing angle steel located above the side support plate abuts against the lower surface of the connection frame, and the horizontal portion of the reinforcing angle steel located below the side support plate abuts against the upper surface of the bottom plate;

[0013] The two reinforcing side plates are respectively fixedly connected to the two ends of the reinforcing angle steel, and the reinforcing middle plate is fixedly connected to the middle of the reinforcing angle steel.

[0014] Preferably, through holes are provided at both ends of the horizontal portion of the reinforcing angle steel.

[0015] Preferably, the locking mechanism includes a support frame, a locking rod, a sliding plate, and a spring;

[0016] The support frame is in an inverted U shape, fixedly connected to the horizontal portion of the reinforcing angle steel, and corresponding to the position of the through hole;

[0017] A rotating hole is provided in the top wall of the support frame, and the axis of the rotating hole coincides with the axis of the through hole;

[0018] The locking rod vertically passes through the rotating hole, and the locking rod slides vertically relative to the top wall of the support frame, and the axis of the locking rod coincides with the axis of the through hole;

[0019] The sliding plate slides vertically in the support frame, and the sliding plate is rotatably connected to the rod body of the locking rod;

[0020] The spring is fixedly connected between the horizontal portion of the reinforcing angle steel and the sliding plate, and the spring is sleeved outside the locking rod.

[0021] Preferably, a sliding groove is provided on the hole wall of the through hole, and a vertical limiting edge is provided on the circumferential side surface of the upper part of the locking rod, and the limiting edge is adapted to the sliding groove.

[0022] Preferably, one end of the locking rod located inside the support frame is hemispherical.

[0023] Preferably, a plurality of first locking holes are provided on the upper surface of the bottom plate, and the axis of the first locking hole coincides with the axis of the through hole of the horizontal portion of the lower reinforcing angle steel.

[0024] Preferably, a plurality of second locking holes are provided on the lower surface of the connection frame, and the axis of the second locking hole coincides with the axis of the through hole of the horizontal portion of the upper reinforcing angle steel.

[0025] Preferably, the top support structure includes a top support frame and an arc-shaped top plate;

[0026] The top support frame includes a connecting beam, a first side rib, a middle rib and a second side rib. The first side rib, the middle rib and the second side rib are all arc-shaped, and the first side rib, the middle rib and the second side rib are arranged parallel to each other;

[0027] Two connecting beams are arranged in parallel. The two ends of the first side rib, the middle rib and the second side rib are respectively fixedly connected to the two connecting beams, and the middle rib is arranged between the first side rib and the second side rib;

[0028] The top plate is fixedly connected to the first side rib, the middle rib and the second side rib;

[0029] The connecting beam slides along the horizontal front-back direction on the upper surface of the connecting frame.

[0030] Preferably, a connecting groove is provided on the outer side surface of the first side rib, and a connecting belt is provided on the outer side surface of the second side rib. The connecting belt is adapted to the connecting groove.

[0031] The utility model has the following beneficial effects:

[0032] 1. The locking structure can support the side support plate, prevent the side support plate from being subjected to the reverse thrust of the roadway side wall, and reduce the supporting force of the side support plate on the roadway side wall;

[0033] 2. The reinforcing angle steel, in cooperation with the reinforcing side plate and the reinforcing middle plate, can support the side support plate, prevent the side support plate from tipping over due to the reverse thrust of the roadway side wall, and thus increase the stability of the support device;

[0034] 3. The connecting frame can support the upper parts of the two side support plates and increase the stability of the side support plates;

[0035] 4. The top plate in the top support structure can support the top of the roadway, prevent the top of the roadway from collapsing, and also prevent falling rocks. The first side rib, the middle rib and the second side rib cooperate to support the top plate. Moreover, since the top support structure is installed under the support of the connecting frame, the safety during the installation of the top support structure is improved, and it is convenient and fast;

[0036] 5. The cooperation of the connecting groove and the connecting belt can increase the connection stability of two adjacent top support structures, and can also play a role in waterproofing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the overall structure of a support device for coal mine mining according to the utility model;

[0038] Figure 2Schematic structural diagram of the top support mechanism in a support device for coal mine mining according to the present utility model;

[0039] Figure 3 Schematic structural diagram of the top support frame in a support device for coal mine mining according to the present utility model;

[0040] Figure 4 Schematic structural diagram of the side support plate, connecting frame and bottom plate in a support device for coal mine mining according to the present utility model;

[0041] Figure 5 Schematic connection diagram of the connection structure between the side support plate and the strengthening connection structure in a support device for coal mine mining according to the present utility model;

[0042] Figure 6 is Figure 5 the enlarged view at A in;

[0043] Figure 7 Schematic structural diagram of the support frame in a support device for coal mine mining according to the present utility model;

[0044] Figure 8 Schematic structural diagram of the locking mechanism in a support device for coal mine mining according to the present utility model.

[0045] In the figure, 1 is the bottom plate; 11 is the first locking hole; 2 is the side support plate; 21 is the strengthening transverse rib; 22 is the strengthening vertical rib; 23 is the anti-overturning structure; 231 is the strengthening angle steel; 2311 is the through hole; 232 is the strengthening side plate; 233 is the strengthening middle plate; 3 is the top support structure; 31 is the top plate; 32 is the top support frame; 321 is the connecting beam; 322 is the first side rib; 3221 is the connecting groove; 323 is the middle rib; 324 is the second side rib; 3241 is the connecting belt; 4 is the connecting frame; 41 is the second locking hole; 42 is the diagonal brace; 5 is the locking mechanism; 51 is the support frame; 511 is the rotating hole; 512 is the sliding groove; 52 is the handle; 53 is the locking rod; 54 is the limiting rib; 55 is the sliding plate; 56 is the spring. Detailed implementation manners

[0046] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can implement it with reference to the text of the specification.

[0047] The present utility model proposes a support device for coal mine mining, as shown in Figure 1 and Figure 4As shown in the figure, it includes a bottom plate 1, side support plates 2, a connecting frame 4, and multiple top support structures 3. There are two side support plates 2, and the two side support plates 2 slide horizontally left and right between the bottom plate 1 and the connecting frame 4 respectively. The top support structure 3 slides horizontally back and forth on the connecting frame 4. Anti-overturning structures 23 capable of supporting the side support plates 2 are respectively provided at the joints of the bottom plate 1 and the two side support plates 2, and anti-overturning structures 23 are respectively provided at the joints of the connecting frame 4 and the two side support plates 2. A locking mechanism 5 is provided on the anti-overturning structure 23.

[0048] As Figure 4 and Figure 5 shown in the figure, the anti-overturning structure 23 includes a reinforcing angle steel 231, a reinforcing middle plate 233, and two reinforcing side plates 232. The vertical part of the reinforcing angle steel 231 is fixedly connected to the inner side wall of the side support plate 2. The horizontal part of the reinforcing angle steel 231 located above the side support plate 2 abuts against the lower surface of the connecting frame 4, and the horizontal part of the reinforcing angle steel 231 located below the side support plate 2 abuts against the upper surface of the bottom plate 1.

[0049] The two reinforcing side plates 232 are respectively fixedly connected to both ends of the reinforcing angle steel 231, and the reinforcing middle plate 233 is fixedly connected to the middle of the reinforcing angle steel 231.

[0050] As Figure 6 shown in the figure, through holes 2311 are provided at both ends of the horizontal part of the reinforcing angle steel 231.

[0051] As Figure 6 and Figure 8 shown in the figure, the locking mechanism 5 includes a support frame 51, a locking rod 53, a sliding plate 55, and a spring 56.

[0052] The support frame 51 is in an inverted U shape, the support frame 51 is fixedly connected to the horizontal part of the reinforcing angle steel 231 and corresponds to the position of the through hole 2311.

[0053] A rotating hole 511 is provided on the top wall of the support frame 51, and the axis of the rotating hole 511 coincides with the axis of the through hole 2311.

[0054] The locking rod 53 passes vertically through the rotating hole 511, and the locking rod 53 slides vertically relative to the top wall of the support frame 51, and the axis of the locking rod 53 coincides with the axis of the through hole 2311.

[0055] The sliding plate 55 slides vertically in the support frame 51, and the sliding plate 55 is rotatably connected to the rod body of the locking rod 53.

[0056] The spring 56 is fixedly connected between the horizontal part of the reinforcing angle steel 231 and the sliding plate 55, and the spring 56 is sleeved outside the locking rod 53.

[0057] As Figure 7As shown, a sliding groove 512 is formed on the pore wall of the via 2311, and a vertical limiting edge 54 is provided on the peripheral side surface of the upper part of the locking rod 53. The limiting edge 54 is adapted to the sliding groove 512.

[0058] As Figure 8 shown, when the locking mechanism 5 is in the unlocked state, the limiting edge 54 is not aligned with the sliding groove 512. The limiting edge 54 abuts against the outer side surface of the top wall of the support frame 51, and the spring 56 is in a stretched state.

[0059] As Figure 6 and Figure 8 shown, a handle 52 is provided at one end of the locking rod 53 located outside the support frame 51.

[0060] As Figure 6 shown, one end of the locking rod 53 located inside the support frame 51 is hemispherical.

[0061] A plurality of first locking holes 11 are formed on the upper surface of the bottom plate 1. The axis of the first locking hole 11 coincides with the axis of the via 2311 on the horizontal part of the lower reinforcing angle steel 231.

[0062] A plurality of second locking holes 41 are formed on the lower surface of the connecting frame 4. The axis of the second locking hole 41 coincides with the axis of the via 2311 on the horizontal part of the upper reinforcing angle steel 231.

[0063] After pushing the bottom plate 1, the side support plates 2 and the connecting frame 4 into the roadway, it is necessary to push the two side support plates 2 in the left - right direction. When the left and right side support plates 2 respectively abut against the left and right side walls of the roadway, it is necessary to lock the lower part and the upper part of the side support plates 2 with the bottom plate 1 and the connecting frame 4 respectively. At this time, the via 2311 on the horizontal part of the lower reinforcing angle steel 231 is aligned with the first locking hole 11, and the via 2311 on the horizontal part of the upper reinforcing angle steel 231 is aligned with the second locking hole 41. Then rotate the handle 52. The handle 52 drives the locking rod 53 to rotate until the limiting edge 54 is aligned with the sliding groove 512. Then the spring 56 resumes and drives the sliding plate 55 to slide towards the horizontal part of the reinforcing angle steel 231. The locking rod 53 also moves along with the sliding plate 55. The limiting edge 54 slides in the sliding groove 512, so that the hemispherical ends of the upper and lower two locking rods 53 respectively pass through the corresponding vias 2311. Moreover, the hemispherical end of the lower locking rod 53 is inserted into the first locking hole 11, and the hemispherical end of the upper locking rod 53 is inserted into the second locking hole 41. In this way, the locking of the left and right two side support plates 2 is completed, which is convenient and fast.

[0064] When the support device needs to be removed, first pull the top support structure 3 out of the roadway, then pull the handle 52 outward from the support frame 51, pull the hemispherical ends of the upper and lower locking rods 53 out of the second locking hole 41 and the first locking hole 11 respectively, and make the limiting edge 54 slide out of the chute 512. Then rotate the handle 52, the handle 52 drives the locking rod 53 to rotate, and the limiting edge 54 rotates accordingly, so that the positions of the limiting edge 54 and the chute 512 are staggered, the spring 56 stretches, the sliding plate 55 slides towards the top wall of the support frame 51. Then release the handle 52, and the limiting edge 54 abuts against the outer side surface of the support frame 51 again. At this time, the locking of the left and right side support plates 2 is released. Subsequently, pull the left and right side support plates 2 back, and finally pull the bottom plate 1, the side support plates 2 and the connecting frame 4 out of the roadway to complete the removal of the support device.

[0065] The locking structure can support the side support plate 2 to prevent the side support plate 2 from receiving the reverse thrust from the side wall of the roadway and reducing the supporting force of the side support plate 2 on the side wall of the roadway.

[0066] The reinforcing angle steel 231, in cooperation with the reinforcing side plate 232 and the reinforcing middle plate 233, can support the side support plate 2 to prevent the side support plate 2 from tipping over due to the reverse thrust from the side wall of the roadway, thereby increasing the stability of the support device.

[0067] The connecting frame 4 can support the upper parts of the two side support plates 2 to increase the stability of the side support plates 2.

[0068] As Figure 2 and Figure 3 shown, the top support structure 3 includes a top support frame 32 and an arc-shaped top plate 31;

[0069] The top support frame 32 includes a connecting beam 321, a first side rib 322, a middle rib 323 and a second side rib 324. The first side rib 322, the middle rib 323 and the second side rib 324 are all arc-shaped, and the first side rib 322, the middle rib 323 and the second side rib 324 are arranged in parallel;

[0070] Two connecting beams 321 are arranged in parallel. The two ends of the first side rib 322, the middle rib 323 and the second side rib 324 are respectively fixedly connected to the two connecting beams 321, and the middle rib 323 is arranged between the first side rib 322 and the second side rib 324;

[0071] The top plate 31 is fixedly connected to the first side rib 322, the middle rib 323 and the second side rib 324;

[0072] The connecting beam 321 slides along the horizontal front-back direction on the upper surface of the connecting frame 4.

[0073] When installing the roof support structure 3, first push the first roof support structure 3 into the roadway, and then push the second roof support structure 3. Make the connecting belt 3241 on the second side rib 324 of the second roof support structure 3 embed into the connecting groove 3221 of the first side rib 322 of the first roof support structure 3, or make the connecting belt 3241 on the second side rib 324 of the first roof support structure 3 embed into the connecting groove 3221 of the first side rib 322 of the second roof support structure 3. Push the subsequent roof support structures 3 into the roadway in the above method in turn, and thus the installation of the roof support structure 3 is completed. The roof plate 31 in the roof support structure 3 can support the top of the roadway, prevent the top of the roadway from collapsing, and also prevent falling stones. The first side rib 322, the middle rib 323 and the second side rib 324 cooperate to support the roof plate 31. Moreover, since the roof support structure 3 is installed under the support of the connecting frame 4, the safety during the installation of the roof support structure 3 is improved, and it is convenient and fast.

[0074] As Figure 2 and Figure 3 shown, further, the outer side surface of the first side rib 322 is provided with a connecting groove 3221, and the outer side surface of the second side rib 324 is provided with a connecting belt 3241. The connecting belt 3241 is adapted to the connecting groove 3221.

[0075] The cooperation of the connecting groove 3221 and the connecting belt 3241 can increase the connection stability of two adjacent roof support structures 3, and can also play a role in waterproofing.

[0076] As Figure 4 shown, the connecting frame 4 is provided with a diagonal brace 42 inside.

[0077] The diagonal brace 42 can increase the strength and stability of the connecting frame 4.

[0078] As Figure 1 shown, the outer side surface of the side support plate 2 is provided with a reinforcing cross rib 21 and a reinforcing vertical rib 22, and the reinforcing cross rib 21 and the reinforcing vertical rib 22 intersect.

[0079] The cooperation of the reinforcing cross rib 21 and the reinforcing vertical rib 22 can increase the bending strength and shear strength of the side support plate 2.

[0080] With the adoption of the present utility model, the bottom plate 1 is pushed into the roadway to be supported, and the connecting frame 4 and the left and right side support plates 2 enter the roadway accordingly. Then, the two side support plates 2 are respectively pushed in the left and right directions so that the left and right side support plates 2 respectively abut against the left and right side walls of the roadway. At this time, the through holes 2311 on the horizontal part of the lower reinforcing angle steel 231 are aligned with the first locking holes 11, and the through holes 2311 on the horizontal part of the upper reinforcing angle steel 231 are aligned with the second locking holes 41. Then, the handle 52 is rotated, and the handle 52 drives the locking rod 53 to rotate until the limiting edge 54 is aligned with the sliding groove 512. Then, the spring 56 resumes and drives the sliding plate 55 to slide towards the horizontal part of the reinforcing angle steel 231. The locking rod 53 also moves along with the sliding plate 55, and the limiting edge 54 slides in the sliding groove 512, so that the upper and lower locking rods 53 respectively pass through the corresponding through holes 2311 and are inserted into the first locking holes 11 and the second locking holes 41. In this way, the locking of the left and right side support plates 2 is completed. Finally, the top support structure 3 is installed. First, the first top support structure 3 is pushed into the roadway, and then the second top support structure 3 is pushed in, so that the connecting belt 3241 on the second side rib 324 of the second top support structure 3 is embedded into the connecting groove 3221 of the first side rib 322 of the first top support structure 3, or the connecting belt 3241 on the second side rib 324 of the first top support structure 3 is embedded into the connecting groove 3221 of the first side rib 322 of the second top support structure 3. Then, the subsequent top support structures 3 are pushed into the roadway in the above-mentioned method in sequence, and thus the installation of the top support structure 3 is completed.

[0081] Although the embodiments of the present utility model have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details and the illustrated and described examples here.

Claims

1. A support device for coal mining, characterized in that: It comprises a bottom plate (1), a side support plate (2), a connection frame (4) and a plurality of top support structures (3); Two side support plates (2) are provided, and the two side support plates (2) slide between the bottom plate (1) and the connection frame (4) respectively along the horizontal left and right directions; The supporting structure (3) slides on the connecting frame (4) along a horizontal front-to-back direction; The connection points between the bottom plate (1) and the two side support plates (2) are respectively provided with anti-overturning structures (23) capable of supporting the side support plates (2); The anti-overturning structure (23) is respectively provided at the connection points between the connection frame (4) and the two side support plates (2); The anti-overturning structure (23) is provided with a locking mechanism (5).

2. A support device for coal mining according to claim 1, characterized in that: The anti-overturning structure (23) comprises a reinforced angle steel (231), a reinforced middle plate (233) and two reinforced side plates (232); The vertical portion of the reinforcing angle steel (231) is fixedly connected to the inner side wall of the side support plate (2), the horizontal portion of the reinforcing angle steel (231) located at the upper portion of the side support plate (2) abuts against the lower surface of the connecting frame (4), and the horizontal portion of the reinforcing angle steel (231) located at the lower portion of the side support plate (2) abuts against the upper surface of the bottom plate (1); The two reinforcing side plates (232) are respectively fixedly connected to the two ends of the reinforcing angle steel (231), and the reinforcing middle plate (233) is fixedly connected to the middle part of the reinforcing angle steel (231).

3. A support device for coal mining according to claim 2, characterized in that: Both ends of the horizontal portion of the reinforcing angle steel (231) are provided with through holes (2311).

4. A support device for coal mining according to claim 3, characterized in that: The locking mechanism (5) comprises a support frame (51), a locking rod (53), a slide plate (55) and a spring (56); The support frame (51) is in an inverted U shape, and the support frame (51) is fixedly connected to the horizontal portion of the reinforcing angle steel (231), and corresponds to the position of the through hole (2311); A rotating hole (511) is provided on the top wall of the support frame (51), and the axis of the rotating hole (511) coincides with the axis of the through hole (2311); The locking rod (53) vertically passes through the rotating hole (511), and the locking rod (53) and the top wall of the supporting frame (51) slide relative to each other in the vertical direction, and the axis of the locking rod (53) coincides with the axis of the through hole (2311); The slide plate (55) slides vertically in the support frame (51), and the slide plate (55) is rotatably connected to the rod body of the locking rod (53); The spring (56) is fixedly connected between the horizontal portion of the reinforcing angle steel (231) and the slide plate (55), and the spring (56) is sleeved outside the locking rod (53).

5. A support device for coal mining according to claim 4, characterized in that: A sliding groove (512) is provided on the hole wall of the through hole (2311), and a vertical limiting edge (54) is provided on the peripheral side surface of the upper part of the locking rod (53), and the limiting edge (54) is adapted to the sliding groove (512).

6. A support device for coal mining according to claim 4, characterized in that: One end of the locking rod (53) located inside the supporting frame (51) is hemispherical.

7. A support device for coal mining according to claim 5, characterized in that: The upper surface of the bottom plate (1) is provided with a plurality of locking holes (11), and the axis of the locking hole (11) coincides with the axis of the through hole (2311) of the horizontal portion of the lower reinforcing angle steel (231).

8. A support device for coal mining according to claim 5, characterized in that: The lower surface of the connection frame (4) is provided with a plurality of second locking holes (41), and the axis of the second locking holes (41) coincides with the axis of the through holes (2311) on the horizontal portion of the upper reinforcing angle steel (231).

9. A support device for coal mining according to claim 1, characterized in that: The top support structure (3) comprises a top support frame (32) and an arc-shaped top plate (31); The top support frame (32) comprises a connecting beam (321), a side rib 1 (322), a middle rib (323) and a side rib 2 (324); the side rib 1 (322), the middle rib (323) and the side rib 2 (324) are all arc-shaped, and the side rib 1 (322), the middle rib (323) and the side rib 2 (324) are arranged parallel to each other; Two connecting beams (321) are provided in parallel, and the two ends of the side rib 1 (322), the middle rib (323) and the side rib 2 (324) are respectively fixedly connected to the two connecting beams (321), and the middle rib (323) is provided between the side rib 1 (322) and the side rib 2 (324); The top plate (31) is fixedly connected to the side rib 1 (322), the middle rib (323) and the side rib 2 (324); The connecting beam (321) slides on the upper surface of the connecting frame (4) in a horizontal front-to-back direction.

10. A support device for coal mining according to claim 9, characterized in that: The outer side surface of the side rib one (322) is provided with a connecting groove (3221), and the outer side surface of the side rib two (324) is provided with a connecting belt (3241), and the connecting belt (3241) is matched with the connecting groove (3221).

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