Assembly equipment for a braking device of a mining monorail crane

Abstract

This application relates to an assembly device for a mine monorail crane braking system, belonging to the technical field of mining equipment. It includes a frame and a mine monorail crane braking assembly. The frame is placed on the ground, and a mounting plate is fixedly installed on one side of the frame, with a hydraulic cylinder mounted on the mounting plate. A limit plate is fixedly installed on the side of the frame away from the mounting plate, and a first clearance hole is formed on the limit plate. The mine monorail crane braking assembly is located on the frame and includes a brake cylinder, a brake spring, a connector, a semi-circular retaining ring, and a flange. This application improves the assembly efficiency of the mine monorail crane braking system.

Description

Technical Field

[0001] This application relates to the technical field of mining equipment, and in particular to an assembly device for a braking device of a mining monorail crane. Background Technology

[0002] The braking device of a mining monorail crane is a core safety component. Its core function is to achieve smooth start-up and shutdown, speed regulation, and emergency braking of the monorail crane by driving the brake shoes to engage and disengage with the crane rail, preventing risks such as slippage and loss of control in inclined roadways or complex working conditions. This device is mainly used in auxiliary transportation in fully mechanized mining faces, material transfer in tunneling roadways, equipment scheduling in underground yards, and personnel commuting in coal mines. It is a key component ensuring the safe and efficient operation of underground monorail crane transportation systems.

[0003] Existing mining monorail crane braking devices are typically assembled manually. The operator first places the brake spring onto the brake cylinder, then manually compresses the brake spring to bring it into a compressed state. At the same time, the operator installs a flange on the movable end of the brake cylinder. After the flange is installed on the movable end of the brake cylinder, the operator releases the brake spring, and the two ends of the brake spring press against the flange and the brake cylinder housing respectively, thus completing the assembly of the mining monorail crane braking device.

[0004] The existing braking devices for mining monorail cranes are inefficient to assemble manually, making it difficult to meet the needs of mine vehicle maintenance and production. Utility Model Content

[0005] In order to improve the assembly efficiency of the braking device for mining monorail cranes, this application provides an assembly equipment for the braking device of mining monorail cranes.

[0006] This application provides an assembly device for a braking system of a mining monorail crane, which adopts the following technical solution: An assembly device for a mine monorail crane braking system includes a frame and a mine monorail crane braking assembly. The frame is placed on the ground, and a mounting plate is fixedly installed on one side of the frame. A hydraulic cylinder is mounted on the mounting plate. A limit plate is fixedly installed on the side of the frame away from the mounting plate, and a first clearance hole is provided on the limit plate. The mine monorail crane braking assembly is located on the frame and includes a brake cylinder, a brake spring, a connector, a semi-circular retaining ring, and a flange. The brake cylinder is horizontally mounted on the frame, and a receiving ring is provided on its movable end. The brake cylinder has a groove in which the fixed end abuts against the movable end of the hydraulic cylinder; the brake spring is sleeved on the brake cylinder, with one end abutting against the fixed end of the brake cylinder; the connector is located on the movable end of the brake cylinder, and a limit ring is fixedly provided on one side; two sets of semicircular rings are provided, both sleeved on the brake cylinder, with one end of the semicircular ring located in the receiving ring groove, and an arc-shaped groove is formed on the semicircular ring, with the limit ring located in the arc-shaped groove; the flange is sleeved on the semicircular ring and abuts against one end of the brake spring.

[0007] By adopting the above technical solution, during the assembly of the braking device for a mining monorail crane, the operator first places the brake cylinder vertically on the frame. Then, the operator places the brake spring around the outside of the brake cylinder, with one end of the brake spring tightly abutting against the fixed end of the brake cylinder. After the brake spring is placed on the brake cylinder, the operator drives the brake cylinder to a horizontal position, so that the fixed end of the brake cylinder abuts against the movable end of the hydraulic cylinder. Simultaneously, the operator places a flange on one end of the brake spring. When both ends of the brake spring abut against the flange and the brake cylinder housing respectively, the operator activates the hydraulic cylinder. The movable end of the hydraulic cylinder pushes the brake cylinder and brake spring closer to the limit position. As the plate moves, the brake cylinder compresses the brake spring during the movement. When the brake spring is compressed to the preset state that meets the flange installation requirements, the movable end of the brake cylinder is located on the side of the limiting plate away from the mounting plate. At this time, the operator places two sets of semi-circular retaining rings into the receiving ring groove, and at the same time, the limiting retaining ring of the connector is engaged in the arc-shaped groove of the semi-circular retaining ring, completing the positioning of the semi-circular retaining ring and the connector. Finally, the operator drives the movable end of the hydraulic cylinder to reset, and the brake spring releases the compressed elastic force. Its two ends tightly abut against the fixed end of the brake cylinder and the flange, respectively, realizing the assembly of the braking device of the mining monorail crane, thus improving the assembly efficiency of the braking device of the mining monorail crane.

[0008] Optionally, the frame is provided with a limiting component, which includes a first limiting side plate and a second limiting side plate; the first limiting side plate is vertically disposed on one side of the frame and fixedly connected to the frame; the second limiting side plate is vertically disposed on the side of the frame away from the first limiting side plate and fixedly connected to the frame.

[0009] By adopting the above technical solution, the brake spring always moves in the channel formed by the first and second limiting side plates during use, making it less likely for the brake spring to shift horizontally during assembly, thus improving the assembly accuracy of the monorail crane braking device.

[0010] Optionally, the limiting component further includes a movable baffle, which is vertically arranged and abuts against the first limiting side plate and the second limiting side plate on both sides. One end of the movable baffle abuts against the limiting plate, and a second clearance hole is provided on the movable baffle.

[0011] By adopting the above technical solution, during use, the operator places the movable baffle on the side of the limiting plate close to the mounting plate, and the movable baffle is in an inclined state; when the operator drives the brake spring to compress towards the limiting plate, the brake spring drives the flange and the movable baffle to rotate. When the movable baffle is in a vertical state, the flange and the movable baffle stop rotating, and the flange and one end of the brake spring are tightly fitted, so that the brake spring is not easy to deviate when compressed.

[0012] Optionally, the frame is provided with a protective assembly, which includes a protective part and a mounting part; the protective part is located at the top of the first limiting side plate and is used to protect the operator; the mounting part is located at the top of the first limiting side plate and is used to install the protective part.

[0013] By adopting the above technical solution, when assembling the braking device of the mining monorail crane, the operator installs the protective part on the top of the first and second limit side plates through the installation part; when the brake spring accidentally falls off, the protective part blocks the rebounding brake spring, so that the brake spring is less likely to injure the operator when it falls off accidentally.

[0014] Optionally, the protective part includes a first support plate, a second support plate, and a protective plate; the first support plate is fixedly disposed at the top end of the first limiting side plate; the second support plate is fixedly disposed at the top end of the second limiting side plate; the protective plate is horizontally disposed, and its two ends are respectively located on the first support plate and the second support plate.

[0015] By adopting the above technical solution, when the braking device of the mining monorail crane is assembled, the protective plate is located at the top of the first limiting side plate and the second limiting side plate, so that when the brake spring accidentally falls off, the brake spring is not easy to disengage from the channel between the first limiting side plate and the second limiting side plate.

[0016] Optionally, the mounting part includes a first mounting rod, a first limiting rod, a second mounting rod, and a second limiting rod; the first mounting rod is fixedly mounted on the first support plate; the first limiting rod is horizontally mounted on the top end of the first mounting rod and fixedly connected to the first mounting rod, and one end of the protective plate is located between the first limiting rod and the first support plate; the second mounting rod is fixedly mounted on the second support plate; the second limiting rod is horizontally mounted on the second mounting rod and fixedly connected to the second mounting rod, and one end of the protective plate is located between the second limiting rod and the second support plate.

[0017] By adopting the above technical solution, when in use, the operator inserts one end of the protective plate into the gap between the first limiting rod and the first support plate, and at the same time inserts the other end into the gap between the second limiting rod and the second support plate, so that when the brake spring accidentally falls off, the brake spring is not easy to disengage from the channel between the first limiting side plate and the second limiting side plate.

[0018] Optionally, multiple sets of the mounting section and the protective plate are provided and are spaced apart along the length of the frame.

[0019] By adopting the above technical solution, when in use, multiple sets of protective plates protect the top of the channel formed by the first limiting side plate and the second limiting side plate, making it difficult for the brake spring to tilt upwards during assembly.

[0020] Optionally, a connecting frame is provided between each of the two adjacent protective plates. The connecting frame is horizontally arranged and its two ends are fixedly connected to the two adjacent protective plates respectively.

[0021] By adopting the above technical solution, during use, the operator drives the protective plate to slide along the length of the frame through the connecting frame. When the protective plate is disengaged from the first and second limit rods, the operator lifts the connecting frame upwards, so that multiple sets of protective plates are disengaged from the top of the first and second limit side plates, thereby making it easy to disassemble multiple sets of protective plates.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a hydraulic cylinder, the brake spring can be easily compressed; 2. By setting limit components, the assembly accuracy of the braking device of the mining monorail crane is improved. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a cross-sectional view of an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 1. Frame; 11. Mounting plate; 111. Hydraulic cylinder; 12. Limiting plate; 121. First clearance hole; 2. Mine monorail crane braking assembly; 21. Brake cylinder; 211. Receiving ring groove; 22. Brake spring; 23. Connector; 231. Limiting circlip; 24. Semi-circular circlip; 241. Arc-shaped groove; 25. Flange; 3. Limiting assembly; 31. First limiting side plate; 32. Second limiting side plate; 33. Movable baffle; 331. Second clearance hole; 4. Protective assembly; 41. Protective part; 411. First support plate; 412. Second support plate; 413. Protective plate; 42. Mounting part; 421. First mounting rod; 422. First limiting rod; 423. Second mounting rod; 424. Second limiting rod; 43. Connecting frame. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0026] This application discloses an assembly device for a braking system of a mining monorail crane. (Refer to...) Figure 1 and Figure 2 An assembly device for a mining monorail crane braking system includes a frame 1, a mining monorail crane braking assembly 2, a limiting assembly 3, and a protective assembly 4. The frame 1 is placed on the ground. A mounting plate 11 is fixedly installed on one side of the frame 1, and a hydraulic cylinder 111 is mounted on the mounting plate 11. A limiting plate 12 is fixedly installed on the side of the frame 1 away from the mounting plate 11, and a first clearance hole 121 is formed on the limiting plate 12. The mining monorail crane braking assembly 2, the limiting assembly 3, and the protective assembly 4 are all located on the frame 1 and are used to protect the operator.

[0027] Reference Figure 1 The mounting plate 11 is vertically arranged on one side of the frame 1 along its length and is rectangular in shape. The hydraulic cylinder 111 is horizontally arranged. The limiting plate 12 is vertically arranged and is circular in shape, with the first clearance hole 121 being circular.

[0028] Reference Figure 2The braking assembly 2 of the mining monorail crane includes a brake cylinder 21, a brake spring 22, a connector 23, a semi-circular retaining ring 24, and a flange 25. The brake cylinder 21 is horizontally mounted on the frame 1, with its fixed end abutting against the movable end of the hydraulic cylinder 111. A receiving ring groove 211 is formed on the movable end of the brake cylinder 21. The brake spring 22 is horizontally sleeved on the brake cylinder 21, with one end abutting against the fixed end of the brake cylinder 21. The connector 23 is located on the movable end of the brake cylinder 21, and a limiting retaining ring 231 is fixedly mounted on one side. Two sets of semi-circular retaining rings 24 are provided, both sleeved on the brake cylinder 21. One end of the semi-circular retaining ring 24 is located within the receiving ring groove 211, and an arc-shaped retaining groove 241 is formed on the semi-circular retaining ring 24. The limiting retaining ring 231 is located within the arc-shaped retaining groove 241. The flange 25 is fitted onto the semi-circular retaining ring 24 and abuts against one end of the brake spring 22.

[0029] When assembling the braking device of the mining monorail crane, the operator first places the brake cylinder 21 vertically on the frame 1, and then the operator puts the brake spring 22 on the outside of the brake cylinder 21, with one end of the brake spring 22 tightly abutting against the fixed end of the brake cylinder 21.

[0030] After the brake spring 22 is fitted onto the brake cylinder 21, the operator drives the brake cylinder 21 to a horizontal position, so that the fixed end of the brake cylinder 21 abuts against the movable end of the hydraulic cylinder 111. At the same time, the operator places the flange 25 on one end of the brake spring 22. When both ends of the brake spring 22 abut against the flange 25 and the housing of the brake cylinder 21 respectively, the operator activates the hydraulic cylinder 111. The movable end of the hydraulic cylinder 111 pushes the brake cylinder 21 and the brake spring 22 toward the limit plate 12. During the movement, the brake cylinder 21 compresses the brake spring 22.

[0031] When the brake spring 22 is compressed to the preset state that meets the installation requirements of the flange 25, the movable end of the brake cylinder 21 is located on the side of the limiting plate 12 away from the mounting plate 11. At this time, the operator puts the two sets of semi-circular retaining rings 24 into the receiving ring groove 211, and at the same time, the limiting retaining ring 231 of the connector 23 is engaged in the arc-shaped retaining groove 241 of the semi-circular retaining ring 24, completing the positioning of the semi-circular retaining ring 24 and the connector 23. Finally, the operator drives the movable end of the hydraulic cylinder 111 to return to its original position, the brake spring 22 releases the compressed elastic force, and its two ends tightly abut against the fixed end of the brake cylinder 21 and the flange 25, respectively, realizing the assembly of the braking device of the mining monorail crane.

[0032] Reference Figure 1 and Figure 2The limiting assembly 3 includes a first limiting side plate 31, a second limiting side plate 32, and a movable baffle 33. The first limiting side plate 31 is vertically positioned on one side of the frame 1 in the width direction and is rectangular in shape; it is fixedly connected to the frame 1. The second limiting side plate 32 is vertically positioned on the side of the frame 1 away from the first limiting side plate 31 and is also rectangular in shape; it is fixedly connected to the frame 1. The movable baffle 33 is vertically positioned and rectangular in shape. Both sides of the movable baffle 33 abut against the first limiting side plate 31 and the second limiting side plate 32. One end of the movable baffle 33 abuts against the limiting plate 12, and the other end abuts against the flange 25. A second clearance hole 331, which is circular, is provided on the movable baffle 33.

[0033] In use, the brake spring 22 always moves through the channel formed by the first limiting side plate 31 and the second limiting side plate 32. When the operator drives the brake spring 22 to compress towards the limiting plate 12, the brake spring 22 drives the flange 25 and the movable baffle 33 to rotate. When the movable baffle 33 is in a vertical state, the flange 25 and the movable baffle 33 stop rotating, and the flange 25 is tightly fitted to one end of the brake spring 22.

[0034] Reference Figure 1 The protective assembly 4 includes a protective part 41, a mounting part 42, and a connecting frame 43. The protective part 41 is located at the top of the first limiting side plate 31 and is used to protect the operator. The mounting part 42 is located at the top of the first limiting side plate 31 and is used to mount the protective part 41. Two sets of mounting parts 42 are provided and are spaced apart along the length of the frame 1. The connecting frame 43 is horizontally mounted at the top of the first limiting side plate 31.

[0035] The protective part 41 includes a first support plate 411, a second support plate 412, and a protective plate 413. The first support plate 411 is horizontally disposed at the top of the first limiting side plate 31 and is rectangular in shape; the first support plate 411 is fixedly connected to the first limiting side plate 31. The second support plate 412 is horizontally disposed at the top of the second limiting side plate 32 and is rectangular in shape; the second support plate 412 is fixedly connected to the second limiting side plate 32. The protective plate 413 is horizontally disposed and is rectangular in shape, with its two ends along its length located on the first support plate 411 and the second support plate 412, respectively. Two protective plates 413 are provided, each corresponding to one of the two sets of mounting parts 42; the two ends of the connecting frame 43 along its length are fixedly connected to the two protective plates 413, respectively.

[0036] The mounting section 42 includes a first mounting rod 421, a first limiting rod 422, a second mounting rod 423, and a second limiting rod 424. The first mounting rod 421 is vertically mounted on the first support plate 411 and is rectangular in shape, and is fixedly connected to the first support plate 411. The first limiting rod 422 is horizontally mounted at the top of the first mounting rod 421 and is rectangular in shape, and is fixedly connected to the first mounting rod 421. One end of the protective plate 413 is located between the first limiting rod 422 and the first support plate 411. The second mounting rod 423 is vertically mounted on the second support plate 412 and is rectangular in shape, and is fixedly connected to the second support plate 412. The second limiting rod 424 is horizontally mounted on the second mounting rod 423 and is rectangular in shape, and is fixedly connected to the second mounting rod 423. One end of the protective plate 413 is located between the second limiting rod 424 and the second support plate 412.

[0037] In use, the operator inserts one end of the protective plate 413 into the gap between the first limiting rod 422 and the first support plate 411, while inserting the other end into the gap between the second limiting rod 424 and the second support plate 412. When the protective plate 413 needs to be disassembled, the operator drives the protective plate 413 to slide along the length of the frame 1 through the connecting frame 43. When the protective plate 413 is disconnected from the first limiting rod 422 and the second limiting rod 424, the operator lifts the connecting frame 43 upwards, so that the protective plate 413 is disconnected from the top of the first limiting side plate 31 and the second limiting side plate 32.

[0038] The implementation principle of the assembly equipment for a mine monorail crane braking device in this application embodiment is as follows: When assembling the mine monorail crane braking device, the operator first places the brake cylinder 21 vertically on the frame 1, and then the operator puts the brake spring 22 on the outside of the brake cylinder 21, with one end of the brake spring 22 tightly abutting against the fixed end of the brake cylinder 21.

[0039] After the brake spring 22 is fitted onto the brake cylinder 21, the operator drives the brake cylinder 21 to a horizontal position, so that the fixed end of the brake cylinder 21 abuts against the movable end of the hydraulic cylinder 111. At the same time, the operator places the flange 25 on one end of the brake spring 22. When the flange 25 is at one end of the brake spring 22, the operator inserts one end of the protective plate 413 into the gap between the first limiting rod 422 and the first support plate 411, and the other end into the gap between the second limiting rod 424 and the second support plate 412.

[0040] When the protective plate 413 is inserted into the gap between the first limiting rod 422 and the first support plate 411, the operator starts the hydraulic cylinder 111. The movable end of the hydraulic cylinder 111 pushes the brake cylinder 21 and the brake spring 22 to move closer to the limiting plate 12. During the movement, the brake cylinder 21 squeezes the brake spring 22.

[0041] When the brake spring 22 is compressed to the preset state that meets the installation requirements of the flange 25, the movable end of the brake cylinder 21 is located on the side of the limiting plate 12 away from the mounting plate 11. At this time, the operator puts the two sets of semi-circular retaining rings 24 into the receiving ring groove 211, and at the same time, the limiting retaining ring 231 of the connector 23 is engaged in the arc-shaped retaining groove 241 of the semi-circular retaining ring 24, completing the positioning of the semi-circular retaining ring 24 and the connector 23. Finally, the operator drives the movable end of the hydraulic cylinder 111 to return to its original position, the brake spring 22 releases the compressed elastic force, and its two ends tightly abut against the fixed end of the brake cylinder 21 and the flange 25, respectively, realizing the assembly of the braking device of the mining monorail crane.

[0042] After the braking device of the mining monorail crane is assembled, the operator drives the protective plate 413 to slide along the length of the frame 1 through the connecting frame 43. When the protective plate 413 is disengaged from the first limiting rod 422 and the second limiting rod 424, the operator lifts the connecting frame 43 upwards to disengage the protective plate 413 from the top of the first limiting side plate 31 and the second limiting side plate 32.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An assembly device for a braking system of a mining monorail crane, characterized in that: The system includes a frame (1) and a mining monorail crane braking assembly (2); the frame (1) is placed on the ground, and a mounting plate (11) is fixedly installed on one side of the frame (1), on which a hydraulic cylinder (111) is installed; a limit plate (12) is fixedly installed on the side of the frame (1) away from the mounting plate (11), and a first clearance hole (121) is provided on the limit plate (12); the mining monorail crane braking assembly (2) is located on the frame (1), and the mining monorail crane braking assembly (2) includes a brake cylinder (21), a brake spring (22), a connector (23), a semi-circular retaining ring (24), and a flange (25); the brake cylinder (21) is horizontally arranged on the frame (1), and a receiving ring groove (211) is provided on the movable end; the brake cylinder (21) is horizontally arranged on the frame (1), and a receiving ring groove (211) is provided on the movable end; the brake cylinder (21) is horizontally arranged on the frame (1), and a receiving ring groove (211) is provided on the movable end; the brake cylinder (21) is horizontally arranged on the frame (1), and a hydraulic cylinder (111) is provided on the movable end; the brake cylinder (211) is horizontally arranged on the frame (1), and a hydraulic cylinder (111) is provided on the movable end; the brake cylinder (211) is horizontally arranged on the frame (1), and a hydraulic cylinder (111) is horizontally arranged on the frame (1). The fixed end of the cylinder (21) abuts against the movable end of the hydraulic cylinder (111); the brake spring (22) is sleeved on the brake cylinder (21), and one end abuts against the fixed end of the brake cylinder (21); the connector (23) is set on the movable end of the brake cylinder (21), and a limit ring (231) is fixedly set on one side; two sets of semicircular rings (24) are provided, and both are sleeved on the brake cylinder (21), one end of the semicircular ring (24) is located in the receiving ring groove (211), and an arc-shaped groove (241) is opened on the semicircular ring (24), and the limit ring (231) is located in the arc-shaped groove (241); the flange (25) is sleeved on the semicircular ring (24) and abuts against one end of the brake spring (22).

2. The assembly equipment for a braking device of a mining monorail crane according to claim 1, characterized in that: The frame (1) is provided with a limiting component (3), which includes a first limiting side plate (31) and a second limiting side plate (32). The first limiting side plate (31) is vertically disposed on one side of the frame (1) and is fixedly connected to the frame (1). The second limiting side plate (32) is vertically disposed on the side of the frame (1) away from the first limiting side plate (31) and is fixedly connected to the frame (1).

3. The assembly equipment for a braking device of a mining monorail crane according to claim 2, characterized in that: The limiting component (3) further includes a movable baffle (33), which is vertically arranged and abuts against the first limiting side plate (31) and the second limiting side plate (32) on both sides. One end of the movable baffle (33) abuts against the limiting plate (12), and a second clearance hole (331) is provided on the movable baffle (33).

4. The assembly equipment for a braking device of a mining monorail crane according to claim 2, characterized in that: The frame (1) is provided with a protective component (4), which includes a protective part (41) and a mounting part (42). The protective part (41) is located at the top of the first limiting side plate (31) and is used to protect the operator. The mounting part (42) is located at the top of the first limiting side plate (31) and is used to install the protective part (41).

5. The assembly equipment for a braking device of a mining monorail crane according to claim 4, characterized in that: The protective part (41) includes a first support plate (411), a second support plate (412), and a protective plate (413); the first support plate (411) is fixedly disposed at the top end of the first limiting side plate (31); the second support plate (412) is fixedly disposed at the top end of the second limiting side plate (32); the protective plate (413) is horizontally disposed, and its two ends are respectively located on the first support plate (411) and the second support plate (412).

6. The assembly equipment for a braking device of a mining monorail crane according to claim 5, characterized in that: The mounting part (42) includes a first mounting rod (421), a first limiting rod (422), a second mounting rod (423), and a second limiting rod (424); the first mounting rod (421) is fixedly mounted on the first support plate (411); the first limiting rod (422) is horizontally mounted on the top of the first mounting rod (421) and fixedly connected to the first mounting rod (421), and one end of the protective plate (413) is located between the first limiting rod (422) and the first support plate (411); the second mounting rod (423) is fixedly mounted on the second support plate (412); the second limiting rod (424) is horizontally mounted on the second mounting rod (423) and fixedly connected to the second mounting rod (423), and one end of the protective plate (413) is located between the second limiting rod (424) and the second support plate (412).

7. The assembly equipment for a braking device of a mining monorail crane according to claim 6, characterized in that: Multiple sets of the mounting section (42) and the protective plate (413) are provided and are spaced apart along the length of the frame (1).

8. The assembly equipment for a braking device of a mining monorail crane according to claim 7, characterized in that: A connecting frame (43) is provided between each of the two adjacent protective plates (413). The connecting frame (43) is horizontally arranged and its two ends are fixedly connected to the two adjacent protective plates (413) respectively.

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