Open-close type wide-angle material conveying equipment

Abstract

The invention discloses open-close type large-angle material conveying equipment, which belongs to the technical field of material conveying and comprises a support frame, first conveying wheels are mounted on the lower side of the support frame, second conveying wheels are mounted on the upper side of the support frame, a conveying belt is arranged outside the first conveying wheels, and a pressing belt is arranged outside the second conveying wheels. A plurality of first partition plates are installed on the outer wall of the conveying belt, a plurality of second partition plates are installed outside the conveying belt, contraction grooves are formed in the two ends of each first partition plate, piston grooves are formed in one sides of the upper ends of the first partition plates, and extension plates are installed in the piston grooves. And deformation and damage of the conveying belt caused by deviation of the first partition plate and the second partition plate due to extrusion of materials on the first partition plate and the second partition plate are avoided.

Description

Technical Field

[0001] This invention relates to the field of material conveying technology, and more specifically, to an openable, large-angle material conveying device. Background Technology

[0002] In industrial production processes, material conveying equipment is widely used in mining, metallurgy, chemical, and building materials industries to realize the transfer of materials between different processes or different heights. Traditional belt conveyors mainly carry materials by conveyor belts and rely on drive devices to drive the conveyor belts to circulate, thereby realizing the continuous transport of materials. However, in working conditions that require the transport of materials at large angles or even vertically, it is necessary to use openable conveyor belts to transport materials, thereby squeezing the materials on the conveyor belt and preventing them from slipping.

[0003] When transporting materials at large angles, openable conveyor belts may experience insufficient friction between the belt and the material due to the excessive angle with the ground, leading to material slippage. Traditional openable conveyor belts add baffles to improve material support, but at excessive angles, the conveyor belt may deform due to material weight or equipment tension. This can cause misalignment or gaps between the baffles and other components of the conveyor belt, resulting in poor sealing. Furthermore, the baffles can easily deform the conveyor belt, causing it to tear and become damaged, thus affecting the equipment's service life and operational reliability. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide an openable large-angle material conveying device.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A large-angle material conveying device with opening and closing mechanism includes a support frame. Multiple first conveying wheels are installed on the lower side of the support frame, and multiple second conveying wheels are installed on the upper side of the support frame. A conveyor belt is sleeved on the outside of the multiple first conveying wheels, and a clamping belt is sleeved on the outside of the multiple second conveying wheels. The clamping belt is used to squeeze the material on the conveyor belt. Multiple first partitions are fixedly installed in the middle of the outer wall of the conveyor belt to block the material. Multiple second partitions are fixedly installed on both sides of the outer wall of the conveyor belt, with two opposing second partitions located on both sides of the first partition. Shrinkage grooves are opened at both ends of the first partition.

[0007] A piston groove is provided on one side of the upper end of the first partition plate, and an extension plate is slidably installed inside the piston groove. A slot is provided at the position of the pressing band corresponding to the extension plate, and the extension plate is inserted into the slot.

[0008] A first tension spring is fixedly installed at the lower end of the extension plate, and the lower end of the first tension spring is fixedly connected to the lower end of the inner wall of the piston groove.

[0009] Two drive components are installed on one side of the support frame, which are used to drive the conveyor belt and the pressure belt.

[0010] Furthermore, the drive assembly includes a drive motor mounted on a support frame, a drive roller fixedly mounted at the output end of the drive motor, and two tension rollers rotatably mounted on the side of the support frame away from the drive roller.

[0011] Furthermore, a slot is provided at one end of the slot, and a groove is provided at the end of the extension plate near the slot. A locking block is slidably installed inside the groove and engages with the slot. A second tension spring is fixedly installed at the end of the locking block located inside the groove. The end of the second tension spring away from the locking block is fixedly connected to the inner wall of the groove. The second tension spring is used to pull the locking block.

[0012] Furthermore, a fixed sleeve is fixedly installed at one end of the first partition, a pressure plate is provided inside the fixed sleeve, a sliding groove is opened on the inner wall of the fixed sleeve 5, a slider is fixedly installed on the outer wall of the pressure plate, the pressure plate is slidably connected to the sliding groove through the slider, and a groove is opened on the conveyor belt at a position corresponding to the inside of the fixed sleeve.

[0013] Furthermore, a corrugated pipe is fixedly installed on the upper side of one end of the pressure plate inside the fixed sleeve. The pressure plate is used to compress the corrugated pipe. The end of the corrugated pipe away from the pressure plate is fixedly connected to the first partition. The first partition is provided with a first venting groove at the position corresponding to the corrugated pipe. The end of the first venting groove away from the corrugated pipe is fixedly connected to the lower end of the inner wall of the piston groove. A second venting groove is provided inside the extension plate. The lower end of the second venting groove communicates with the inside of the piston groove, and the upper end of the second venting groove communicates with the inside of the groove.

[0014] Furthermore, a compression spring is fixedly installed at one end of the pressure plate inside the fixed sleeve, and the end of the compression spring away from the pressure plate is fixedly connected to the first partition plate. The compression spring is used to compress the pressure plate.

[0015] Furthermore, the first partition plate has a telescopic groove at one end near the piston groove, and a positioning block is slidably installed inside the telescopic groove. The upper side of the positioning block near the piston groove is inclined. The extension plate has a positioning groove at the position corresponding to the positioning block, and the positioning block and the positioning groove are inserted into each other.

[0016] Furthermore, a return spring is fixedly installed at one end of the positioning block inside the expansion groove. The return spring presses against the positioning block, and the end of the return spring away from the positioning block is fixedly connected to the inner wall of the expansion groove.

[0017] Furthermore, a top rod is installed through the upper end of the first partition, and the lower end of the top rod extends through the first partition into the shrinkage groove. A pressure groove is opened at the position corresponding to the lower end of the top rod at the upper end of the positioning block. The lower end of the inner wall of the pressure groove has an inclined structure, and the lower end of the top rod squeezes the inclined part of the inner wall of the pressure groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) The present invention can effectively block the material by setting the first partition and the second partition, so as to avoid the material between the conveyor belt and the pressing belt and the ground being too large when the material is conveyed to a high place, which would cause the material between the pressing belt and the conveyor belt to slide downward under the action of gravity, affecting the conveying efficiency. At the same time, the extension plate and the slot can support the first partition, preventing the material from squeezing the first partition and the second partition, causing the first partition and the second partition to shift and the conveyor belt to deform and be damaged.

[0020] (2) The present invention can fix the extension plate in the slot by setting the card block and the card slot, so as to avoid the material squeezing the pressing belt and causing the pressing belt to separate from the extension plate, and can effectively ensure the stability of the first partition during the conveying process.

[0021] (3) The present invention can automatically adjust the material conveying amount in each area according to the conveying angle by setting the pressure plate and the trough, so as to avoid excessive conveying amount causing excessive squeezing force on the first partition and the second partition, which would cause the conveyor belt to break. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the first and second conveyor wheels of the present invention;

[0024] Figure 3 This is a schematic diagram of a portion of the structure between the conveyor belt and the compression belt of the present invention;

[0025] Figure 4 This is a schematic diagram of the slot and card slot structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the first and second partition plates of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the fixing sleeve of the present invention;

[0028] Figure 7 This is a partial structural diagram of the first and second venting grooves of the present invention;

[0029] Figure 8 This is a schematic diagram of the top rod structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the tensioning roller section of the present invention.

[0031] Explanation of the labels in the diagram:

[0032] 1. Support frame; 101. First conveyor wheel; 102. Second conveyor wheel;

[0033] 2. Conveyor belt; 201. First partition; 202. Second partition; 203. Shrinkage groove; 204. Piston groove; 205. Extension plate; 206. First tension spring; 207. Slot; 208. Locking block; 209. Second tension spring; 210. Leakage groove; 211. First vent groove; 212. Second vent groove; 213. Positioning groove;

[0034] 3. Compression band; 301. Slot; 302. Card slot;

[0035] 4. Drive assembly; 401. Drive motor; 402. Drive roller; 403. Tensioning roller;

[0036] 5. Fixed sleeve; 501. Pressure plate; 502. Slide groove; 503. Bellows; 504. Compression spring; 505. Slider;

[0037] 6. Telescopic groove; 601. Positioning block; 602. Return spring; 603. Top rod; 604. Pressure groove. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 9A hinged, large-angle material conveying device includes a support frame 1, which is adjustable to change its height, allowing for different heights on both sides of the support frame 1. This adjustment enables the conveyor belt 2 and the clamping belt 3 to be adjusted at different heights for conveying materials to different locations. Multiple first conveyor wheels 101 are mounted on the lower side of the support frame 1, and multiple second conveyor wheels 102 are mounted on the upper side. The conveyor belt 2 is fitted over the multiple first conveyor wheels 101, and the clamping belt 3 is fitted over the multiple second conveyor wheels 102. The clamping belt 3 is used to tighten the conveyor belt. The material on the conveyor belt 2 is squeezed. Multiple first partitions 201 are fixedly installed in the middle of the outer wall of the conveyor belt 2. The first partitions 201 block the material. Multiple second partitions 202 are fixedly installed on both sides of the outer wall of the conveyor belt 2. The two opposing second partitions 202 are located on both sides of the first partition 201. The first partition 201 has a shrinkage groove 203 at both ends. The second partition 202 can move relative to the shrinkage groove 203. When the conveyor belt 2 is squeezed by the material, the second partition 202 can still cooperate with the first partition 201 to block the material after the conveyor belt 2 deforms.

[0040] A piston groove 204 is provided on one side of the upper end of the first partition 201. An extension plate 205 is slidably installed inside the piston groove 204. A slot 301 is provided at the position corresponding to the extension plate 205 of the pressing band 3. The extension plate 205 is inserted into the slot 301.

[0041] A first tension spring 206 is fixedly installed at the lower end of the extension plate 205. The lower end of the first tension spring 206 is fixedly connected to the lower end of the inner wall of the piston groove 204. The first tension spring 206 can pull the extension plate 205 and cause the extension plate 205 to descend when the lower end of the extension plate 205 is not compressed by air.

[0042] Two drive components 4 are installed on one side of the support frame 1. The drive components 4 are used to drive the conveyor belt 2 and the pressing belt 3 to move.

[0043] The drive assembly 4 includes a drive motor 401 mounted on the support frame 1. A drive roller 402 is fixedly mounted on the output end of the drive motor 401. Two tension rollers 403 are rotatably mounted on the side of the support frame 1 away from the drive roller 402. A sprocket can also be mounted on the output end of the drive motor 401. A chain is fixedly mounted on the inner wall of the conveyor belt 2 and the pressing belt 3. The drive motor 401 drives the conveyor belt 2 and the pressing belt 3 to rotate through the cooperation of the sprocket and the chain.

[0044] A fixed sleeve 5 is fixedly installed at one end of the first partition 201. A pressure plate 501 is provided inside the fixed sleeve 5. A sliding groove 502 is opened on the inner wall of the fixed sleeve 5. A slider 505 is fixedly installed on the outer wall of the pressure plate 501. The pressure plate 501 is slidably connected to the sliding groove 502 through the slider 505. A groove 210 is opened on the conveyor belt 2 at the position corresponding to the inside of the fixed sleeve 5.

[0045] A corrugated pipe 503 is fixedly installed on the upper side of one end of the pressure plate 501 inside the fixed sleeve 5. The pressure plate 501 is used to squeeze the corrugated pipe 503. The end of the corrugated pipe 503 away from the pressure plate 501 is fixedly connected to the first partition 201. The first partition 201 is provided with a first vent groove 211 at the position corresponding to the corrugated pipe 503. The end of the first vent groove 211 away from the corrugated pipe 503 is fixedly connected to the lower end of the inner wall of the piston groove 204.

[0046] By adopting the above technical solution, during use, the drive motor 401 drives the drive roller 402 to rotate, and the drive roller 402 can drive the conveyor belt 2 to rotate. Similarly, the drive roller 402, which cooperates with the tension roller 403, moves under the action of the drive motor 401. During the rotation of the conveyor belt 2, it can drive the multiple first partitions 201 and second partitions 202 at its upper end to move. When the first partitions 201 and second partitions 202 move, they can push the material at the upper end of the conveyor belt 2 to move. Furthermore, when the equipment conveys materials to a higher position, the first partitions 201 and second partitions 202 can support the materials and prevent the materials from sliding down between the conveyor belt 2 and the pressing belt 3, effectively ensuring the safety and reliability of conveying materials.

[0047] During the rotation of the conveyor belt 2 and the pressing belt 3, the pressing belt 3 is located on the upper side of the conveyor belt 2. During the material conveying process, the material can squeeze the pressure plate 501 under its own gravity, thereby causing the pressure plate 501 to move into the fixed sleeve 5. After the pressure plate 501 moves, it can squeeze the corrugated pipe 503. The corrugated pipe 503 will shrink after being squeezed. At this time, the air inside it can enter the first ventilation groove 211. Then the air can enter the piston groove 204 through the first ventilation groove 211 and squeeze the lower end of the extension plate 205, causing the extension plate 205 to rise. After the extension plate 205 rises, it can be inserted into the slot 301, thereby fixing the first partition 201 relative to the pressing belt 3. After conveying the material upward, the first partition 201 can be more stable, preventing the second partition 202 from deflecting under the squeezing force of the material, which would cause the conveyor belt 2 to deform and be damaged.

[0048] When the material on conveyor belt 2 exceeds the load capacity of each area, the pressure exerted by the material on the pressure plate 501 increases. At this time, the distance that the pressure plate 501 moves relative to the fixed sleeve 5 also increases. When the pressure plate 501 moves to a certain position, it no longer blocks the trough 210. At this time, the material can leak out of the trough 210, reducing the weight of the area and preventing the conveyor belt 2 from breaking due to excessive load. Furthermore, the larger the angle between the conveyor belt 2 and the ground, the greater the tension of the conveyor belt 2 on the higher part under its own weight. At this time, the conveyor belt 2 is more likely to break due to excessive load. As the angle between the conveyor belt 2 and the ground increases, the pressure exerted by the material on the pressure plate 501 under the decomposition force of gravity also increases, thereby enabling the pressure plate 501 to move a further distance. This allows more material to be unloaded, preventing the conveyor belt 2 from being pulled and broken when the angle between the conveyor belt 2 and the ground is too large.

[0049] One end of the slot 301 has a slot 302, and the end of the extension plate 205 near the slot 302 has a slot 207. A locking block 208 is slidably installed inside the slot 207 and engages with the slot 302. A second tension spring 209 is fixedly installed at the end of the locking block 208 inside the slot 207. The end of the second tension spring 209 away from the locking block 208 is fixedly connected to the inner wall of the slot 207. The second tension spring 209 is used to pull the locking block 208. A second venting groove 212 is provided inside the extension plate 205. The lower end of the second venting groove 212 communicates with the inside of the piston groove 204, and the upper end of the second venting groove 212 communicates with the inside of the slot 207.

[0050] By adopting the above technical solution, after the extension plate 205 rises to the top, the position of the slot 207 on the extension plate 205 will correspond to the position of the slot 302. At this time, the air in the piston groove 204 can enter the slot 207 through the second ventilation groove 212, thereby squeezing the block 208 and causing the block 208 to move. After the block 208 moves relative to the slot 207, it can move to the outside of the slot 207 and insert into the slot 302, so that the extension plate 205 is fixed relative to the slot 301. This prevents the material from squeezing the clamping band 3 during transportation, causing the clamping band 3 to deform, which would cause the extension plate 205 to detach from the slot 301 and lose its function of supporting the first partition 201.

[0051] A compression spring 504 is fixedly installed at one end of the pressure plate 501 inside the fixed sleeve 5. The end of the compression spring 504 away from the pressure plate 501 is fixedly connected to the first partition 201. The compression spring 504 is used to compress the pressure plate 501.

[0052] The first partition 201 has a telescopic groove 6 at one end near the piston groove 204. A positioning block 601 is slidably installed inside the telescopic groove 6. The upper side of the positioning block 601 near the piston groove 204 is inclined. The extension plate 205 has a positioning groove 213 at the position corresponding to the positioning block 601. The positioning block 601 and the positioning groove 213 are inserted into each other.

[0053] A return spring 602 is fixedly installed at one end of the positioning block 601 inside the expansion groove 6. The return spring 602 presses the positioning block 601, and the end of the return spring 602 away from the positioning block 601 is fixedly connected to the inner wall of the expansion groove 6.

[0054] A push rod 603 is installed through the upper end of the first partition 201. The lower end of the push rod 603 extends through the first partition 201 into the shrinkage groove 203. A pressure groove 604 is provided at the position corresponding to the lower end of the push rod 603 at the upper end of the positioning block 601. The lower end of the inner wall of the pressure groove 604 has an inclined structure. The lower end of the push rod 603 squeezes the inclined part of the inner wall of the pressure groove 604.

[0055] By adopting the above technical solution, after the pressing band 3 gradually adheres to the upper end of the first partition 201, the pressing band 3 can squeeze the upper end of the push rod 603, thereby causing the push rod 603 to descend. When the push rod 603 descends, its lower end can squeeze the inclined part in the pressure groove 604. At this time, under the action of the decomposition force of the squeezing force, the positioning block 601 can move into the telescopic groove 6. When the positioning block 601 has completely moved into the telescopic groove 6, the positioning block 601 will disengage from the positioning groove 213. At this time, under the action of air pressure, the extension plate 205 can rise and insert into the slot 301. When the push rod 603 is under pressure, the position of the slot 301 is already aligned with the position of the extension plate 205. The push rod 603 on the same first partition 201 on the upper side is closer to the drive roller 402 than the extension plate 205.

[0056] Instructions for use: After the equipment is installed, start the drive motor 401 to drive the drive roller 402, which will cause the conveyor belt 2 and the pressing belt 3 to rotate. After the material is placed on the conveyor belt 2, the conveyor belt 2 will move the first partition 201 and the second partition 202 to transport the material to the designated location. During the conveying process, the first conveyor wheel 101 and the second conveyor wheel 102 can support the conveyor belt 2 and compress the pressing belt 3, making the conveyor belt 2 and the pressing belt 3 fit tightly together. During the conveying process, the extension plate 205 can extend from the piston groove 204 and insert into the slot 3. Within 01, to prevent the first partition 201 and the second partition 202 from being squeezed by the material and causing the single stress point to deform the conveyor belt 2 and thus tear, the extrusion pressure can be effectively distributed to the pressing belt 3, thereby keeping the first partition 201 and the second partition 202 stable. In addition, under the action of the locking block 208, it can cooperate with the locking groove 302 to fix the extension plate 205 in the slot 301, preventing the material from squeezing the pressing belt 3 and causing the pressing belt 3 to deform and the extension plate 205 to detach from the slot 301, thus affecting the supporting force of the first partition 201 and the second partition 202 on the material;

[0057] During the material conveying process, the pressure plate 501 can automatically select whether to open the trough 210 to discharge excess material according to the pressure it receives, which can maintain the conveying efficiency while preventing the conveyor belt 2 from being pulled and broken.

[0058] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A hinged, large-angle material conveying device, comprising a support frame 1, characterized in that: Multiple first conveyor wheels 101 are installed on the lower side of the support frame 1, and multiple second conveyor wheels 102 are installed on the upper side of the support frame 1. A conveyor belt 2 is sleeved on the outside of the multiple first conveyor wheels 101, and a pressing belt 3 is sleeved on the outside of the multiple second conveyor wheels 102. The pressing belt 3 is used to squeeze the material on the conveyor belt 2. Multiple first partitions 201 are fixedly installed in the middle of the outer wall of the conveyor belt 2. The first partitions 201 block the material. Multiple second partitions 202 are fixedly installed on both sides of the outer wall of the conveyor belt 2. Two opposing second partitions 202 are located on both sides of the first partition 201. Shrinkage grooves 203 are opened at both ends of the first partition 201. A piston groove 204 is provided on one side of the upper end of the first partition 201. An extension plate 205 is slidably installed inside the piston groove 204. A slot 301 is provided at the position corresponding to the extension plate 205 of the pressing band 3. The extension plate 205 is inserted into the slot 301. A first tension spring 206 is fixedly installed at the lower end of the extension plate 205, and the lower end of the first tension spring 206 is fixedly connected to the lower end of the inner wall of the piston groove 204. Two drive components 4 are installed on one side of the support frame 1. The drive components 4 are used to drive the conveyor belt 2 and the pressing belt 3 to move.

2. The opening and closing type large-angle material conveying device according to claim 1, characterized in that: The drive assembly 4 includes a drive motor 401 mounted on a support frame 1. A drive roller 402 is fixedly mounted on the output end of the drive motor 401. Two tension rollers 403 are rotatably mounted on the side of the support frame 1 away from the drive roller 402.

3. The opening and closing type large-angle material conveying device according to claim 2, characterized in that: One end of the slot 301 has a slot 302, and the end of the extension plate 205 near the slot 302 has a slot 207. A locking block 208 is slidably installed inside the slot 207 and engages with the slot 302. A second tension spring 209 is fixedly installed at one end of the locking block 208 inside the slot 207. The end of the second tension spring 209 away from the locking block 208 is fixedly connected to the inner wall of the slot 207. The second tension spring 209 is used to pull the locking block 208.

4. The opening and closing type large-angle material conveying device according to claim 3, characterized in that: A fixed sleeve 5 is fixedly installed at one end of the first partition 201. A pressure plate 501 is provided inside the fixed sleeve 5. A sliding groove 502 is opened on the inner wall of the fixed sleeve 5. A slider 505 is fixedly installed on the outer wall of the pressure plate 501. The pressure plate 501 is slidably connected to the sliding groove 502 through the slider 505. A groove 210 is opened on the conveyor belt 2 at a position corresponding to the inside of the fixed sleeve 5.

5. The opening and closing type large-angle material conveying device according to claim 4, characterized in that: A corrugated pipe 503 is fixedly installed on the upper side of one end of the pressure plate 501 inside the fixed sleeve 5. The pressure plate 501 is used to compress the corrugated pipe 503. The end of the corrugated pipe 503 away from the pressure plate 501 is fixedly connected to the first partition 201. The first partition 201 is provided with a first venting groove 211 at the position corresponding to the corrugated pipe 503. The end of the first venting groove 211 away from the corrugated pipe 503 is fixedly connected to the lower end of the inner wall of the piston groove 204. A second venting groove 212 is provided inside the extension plate 205. The lower end of the second venting groove 212 communicates with the inside of the piston groove 204, and the upper end of the second venting groove 212 communicates with the inside of the slot 207.

6. The opening and closing type large-angle material conveying device according to claim 5, characterized in that: A compression spring 504 is fixedly installed at one end of the pressure plate 501 inside the fixed sleeve 5. The end of the compression spring 504 away from the pressure plate 501 is fixedly connected to the first partition 201. The compression spring 504 is used to compress the pressure plate 501.

7. The opening and closing type large-angle material conveying device according to claim 6, characterized in that: The first partition plate 201 has a telescopic groove 6 at one end near the piston groove 204. A positioning block 601 is slidably installed inside the telescopic groove 6. The upper side of the positioning block 601 near the piston groove 204 is inclined. The extension plate 205 has a positioning groove 213 at the position corresponding to the positioning block 601. The positioning block 601 and the positioning groove 213 are inserted into each other.

8. The opening and closing type large-angle material conveying device according to claim 7, characterized in that: A reset spring 602 is fixedly installed at one end of the positioning block 601 located inside the telescopic groove 6. The reset spring 602 presses against the positioning block 601, and the end of the reset spring 602 away from the positioning block 601 is fixedly connected to the inner wall of the telescopic groove 6.

9. The opening and closing type large-angle material conveying device according to claim 8, characterized in that: A top rod 603 is installed through the upper end of the first partition 201. The lower end of the top rod 603 extends through the first partition 201 into the shrinkage groove 203. A pressure groove 604 is provided at the position corresponding to the lower end of the top rod 603 at the upper end of the positioning block 601. The lower end of the inner wall of the pressure groove 604 has an inclined structure. The lower end of the top rod 603 squeezes the inclined part of the inner wall of the pressure groove 604.

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