A device for stemming blast holes in open pit mining

Abstract

The utility model relates to the technical field of filling device, especially a blast hole filling device for open pit mining. It mainly aims at the problem that the force of the operator is difficult to control in the artificial filling operation of the blast hole of the open pit, and the explosive is easily triggered in advance due to too much force, and there is a serious safety hazard, and the following technical scheme is proposed: a mobile trolley is fixedly connected with a material box through a mounting frame at the top; a filling mechanism is arranged on one side of the material box, which is used for discharging filling materials into the blast hole; a compaction assembly is installed on the side of the filling mechanism, which is used for compacting the filling materials in the blast hole and ensuring that the pressure is within a safe range; a giving way mechanism is arranged on the side of the mobile trolley, which is used for adjusting the relative position of the compaction assembly and the blast hole. The utility model can avoid the risk of explosive triggering caused by improper force in artificial filling, and ensure the safety of the operators and the stability of the mine construction.

Description

Technical Field

[0001] This utility model relates to the field of filling device technology, and in particular to a filling device for blast holes in open-pit mining. Background Technology

[0002] In open-pit mining operations, borehole packing is a crucial step in the blasting process, directly impacting blasting effectiveness and operational safety. The primary function of borehole packing is to prevent premature energy leakage, prolong the explosive's contact time within the borehole, thereby improving blasting efficiency. It also effectively reduces hazards such as flyrock, noise, and harmful gases generated during blasting. Currently, most borehole packing in open-pit mines is done manually. Specifically, operators typically fill the borehole with packing materials such as mineral sand and rock powder, then tamp the material down using tools like bamboo sticks and wooden rods to ensure compaction. However, this traditional manual packing method presents significant safety risks in practical applications.

[0003] Because the force applied during manual compaction of filling materials relies entirely on the operator's experience and feel, it is difficult to achieve uniform and stable force control. When operators apply excessive force while compacting filling materials such as ore, violent collisions or friction may occur between the explosives and the detonating equipment. This unexpected situation can easily lead to premature detonation of the explosives. In the event of an accidental detonation, not only will the lives of on-site operators be seriously threatened, but it may also cause significant damage to surrounding mining equipment, the mining environment, and subsequent construction processes, resulting in incalculable casualties and economic losses for the mining company. Therefore, this utility model proposes a blast hole filling device for open-pit mining. Utility Model Content

[0004] The purpose of this invention is to address the problem in the background art where, during manual filling of blast holes in open-pit mines, it is difficult for operators to control the amount of force applied, and excessive force can easily cause premature detonation of explosives, posing a serious safety hazard. This invention proposes a blast hole filling device for open-pit mining.

[0005] The technical solution of this utility model is as follows: a blast hole filling device for open-pit mining, comprising a mobile trolley, the top of which is fixedly connected to a material box via a mounting frame; a filling mechanism disposed on one side of the material box, the filling mechanism being used to discharge filling material into the blast hole; a compaction component installed on the side of the filling mechanism, the compaction component being used to compact the filling material in the blast hole while ensuring that the pressure is within a safe range; and a clearance mechanism disposed on the side of the mobile trolley, the clearance mechanism being used to adjust the relative position of the compaction component and the blast hole.

[0006] Optionally, the filling mechanism includes a discharge trough fixedly connected to the bottom of the material box. The discharge trough is inclined. A first push rod motor installed on the side of the material box is provided above the discharge trough. A baffle is fixedly connected to the output end of the first push rod motor. The baffle is slidably connected in the discharge trough. A discharge hopper is provided below the end of the discharge trough away from the material box.

[0007] Optionally, a discharge port is provided at the bottom of the material box corresponding to the discharge trough, and multiple sets of support rods are fixedly connected between the moving trolley and the discharge trough. Vibration motors are installed at the bottom of both the material box and the discharge trough.

[0008] Optionally, the compaction assembly includes a movable plate fixedly connected to the outside of the discharge hopper. The movable plate is L-shaped. A second push rod motor is installed on the top of the movable plate. The output end of the second push rod motor passes through the movable plate and is fixedly connected to an installation plate. A lifting plate is fixedly connected to the bottom of the installation plate. A movable cylinder is installed at the bottom of the lifting plate. A movable block is slidably connected in the movable cylinder. A connecting rod is fixedly connected to the bottom of the movable block. A pressure plate is fixedly connected to the bottom of the connecting rod. The pressure plate is made of wood.

[0009] Optionally, a spring is provided above the moving block and located in the moving cylinder, and a detection plate is provided above the spring. The detection plate is slidably connected in the moving cylinder. A pressure sensor is installed at the bottom of the mounting plate. The detection end of the pressure sensor is in contact with the detection plate. A through hole is opened at the position corresponding to the pressure sensor on the lifting plate.

[0010] Optionally, the top of the lifting plate is fixedly connected to multiple sets of limiting rods, the limiting rods penetrate the moving plate and slide with it, the outer ring of the limiting rods is fitted with a limiting cylinder, the limiting cylinder is fixedly connected to the moving plate, and the top of the limiting rods is fixedly connected to a limiting plate.

[0011] Optionally, the clearance mechanism includes a third push rod motor vertically mounted on the side of the mobile trolley near the compaction component. The output end of the third push rod motor is fixedly connected to a first connecting plate. A connecting frame is fixedly connected to one side of the first connecting plate. Multiple sets of first sliders are fixedly connected to the connecting frame on the side near the mobile trolley. A first slide rail is slidably connected to the first slider. An installation block is fixedly connected between the first slide rail and the mobile trolley.

[0012] Optionally, the connecting frame is a box-shaped structure with openings at both ends. A horizontally arranged fourth push rod motor is installed in the connecting frame. A second connecting plate is fixedly connected to the output end of the fourth push rod motor. The second connecting plate passes through one side of the connecting frame and slides with it. One end of the second connecting plate is fixedly connected to a movable plate. Multiple sets of second sliders are fixedly connected to the movable plate near the connecting frame. A second slide rail is slidably connected to the second slider, and the second slide rail is fixedly connected to the connecting frame.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] This invention uses the cooperation of a pressure sensor and a spring in the compaction assembly to detect and control the pressure of the pressure plate on the filling material in real time, avoiding the risk of explosive activation caused by excessive force during manual filling. At the same time, the overall mechanized operation of the device reduces the frequency of personnel directly contacting the blast hole, further reducing safety hazards.

[0015] Furthermore, the device can be moved flexibly and positioned accurately by a mobile trolley. The filling mechanism ensures a stable supply of materials through the anti-clogging design of the vibration motor. The clearance mechanism adjusts the relative position of the compaction component and the blast hole. The fully mechanized collaborative operation improves the filling efficiency, and the controllable compaction pressure ensures uniform filling density.

[0016] In summary, this invention can avoid the risk of explosive detonation caused by improper manual filling, thus ensuring the safety of workers and the stability of mine construction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a blast hole filling device for open-pit mining;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0019] Figure 3 This is a cross-sectional structural diagram of the compaction component.

[0020] Figure label:

[0021] 1. Mobile trolley; 11. Mounting frame; 12. Support rod;

[0022] 2. Material box; 21. Discharge port;

[0023] 3. Filling mechanism; 31. Discharge chute; 32. First push rod motor; 33. Baffle; 34. Discharge hopper; 35. Vibrating motor;

[0024] 4. Compactor assembly; 41. Moving plate; 42. Second push rod motor; 43. Mounting plate; 44. Lifting plate; 45. Moving cylinder; 46. Moving block; 47. Connecting rod; 48. Pressure plate; 49. Spring; 410. Detection plate; 411. Pressure sensor; 412. Limiting rod; 413. Limiting cylinder; 414. Limiting disc; 415. Through hole;

[0025] 5. Yielding mechanism; 51. Third push rod motor; 52. First connecting plate; 53. Connecting frame; 54. First slider; 55. First slide rail; 56. Mounting block; 57. Fourth push rod motor; 58. Second connecting plate; 59. Second slider; 510. Second slide rail. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0027] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0028] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Example

[0032] like Figure 1 As shown, this utility model proposes a blast hole filling device for open-pit mining, including a mobile trolley 1. The mobile trolley 1 facilitates the overall movement of the device to the blast hole position, and it is used in conjunction with a photoelectric sensor in the prior art to achieve accurate positioning at the blast hole position. A material box 2 is fixedly connected to the top of the mobile trolley 1 via a mounting bracket 11. The material box 2 is used to hold sand, gravel, and rock powder for filling.

[0033] For further details, please refer to Figure 1 and Figure 2 The aforementioned packing device includes a packing mechanism 3 disposed on one side of the material box 2. The packing mechanism 3 is used to discharge packing material into the blast hole. The packing mechanism 3 includes a discharge trough 31 fixedly connected to the bottom of the material box 2. The discharge trough 31 is inclined, and a discharge port 21 is opened at the bottom of the material box 2 corresponding to the position of the discharge trough 31. The packing material in the material box 2 enters the discharge trough 31 through the discharge port 21. A first push rod motor 32 is installed above the discharge trough 31 on the side of the material box 2. A baffle 33 is fixedly connected to the output end of the first push rod motor 32. The first push rod motor 32 is used to drive the baffle 33 to move up and down. The baffle 33 is slidably connected in the discharge trough 31, and the setting of the baffle 33 controls whether to discharge material. A discharge hopper 34 is disposed below the end of the discharge trough 31 away from the material box 2. The packing material passing through the discharge trough 31 enters the discharge hopper 34 and is guided by the discharge hopper 34 into the blast hole. Multiple sets of support rods 12 are fixedly connected between the mobile trolley 1 and the discharge trough 31, which ensures that the position of the discharge trough 31 is firmly fixed. Vibration motors 35 are installed at the bottom of both the material box 2 and the discharge trough 31. The vibration motors 35 generate vibration after starting to prevent the filling material in the material box 2 and the discharge trough 31 from clogging.

[0034] Specifically, such as Figures 1 to 3As shown, the aforementioned packing device also includes a compaction assembly 4 installed on the side of the packing mechanism 3. The compaction assembly 4 is used to compact the packing material inside the borehole while ensuring that the pressure is within a safe range. The compaction assembly 4 includes a movable plate 41 fixedly connected to the outside of the discharge hopper 34. The movable plate 41 is L-shaped and drives the discharge hopper 34 to move synchronously. A second push rod motor 42 is installed on the top of the movable plate 41. The output end of the second push rod motor 42 passes through the movable plate 41 and is fixedly connected to a mounting plate 43. A lifting plate 44 is fixedly connected to the bottom of the mounting plate 43. After the second push rod motor 42 is started, it drives the lifting plate 44 to move up and down through the mounting plate 43. A movable cylinder 45 is installed at the bottom of the lifting plate 44, and the lifting plate 44 drives the movable cylinder 45 to move synchronously. A movable block 46 is slidably connected to the movable cylinder 45. A connecting rod 47 is fixedly connected to the bottom of the movable block 46, and a pressure plate 48 is fixedly connected to the bottom of the connecting rod 47. When the movable cylinder 45 moves downward, the pressure plate 48 moves downward synchronously through the movable block 46 and the connecting rod 47, so that the pressure plate 48 contacts the filling material in the blast hole and presses it tightly. The pressure plate 48 is made of wood to prevent static electricity or sparks from being generated by friction between the pressure plate 48 and the rock wall. A spring 49 is set above the movable block 46 and located in the movable cylinder 45. A detection plate 410 is set above the spring 49 and is slidably connected to the movable cylinder 45. A pressure sensor 411 is installed at the bottom of the mounting plate 43. The detection end of the pressure sensor 411 contacts the detection plate 410. A through hole 415 is opened on the lifting plate 44 at the corresponding position of the pressure sensor 411. As the second pusher motor 42 extends and the bottom of the pressure plate 48 contacts the filling material, the downward movement of the pressure plate 48 is small due to the contact between the bottom of the pressure plate 48 and the filling material. As the mounting plate 43 and the lifting plate 44 continue to descend, the spring 49 is compressed, applying pressure to the pressure plate 48 through the spring force of the spring 49. Simultaneously, the pressure sensor 411 detects the magnitude of the spring force of the spring 49 and feeds the data back to the controller, which then controls the start and stop of the second pusher motor 42 to prevent excessive downward pressure on the pressure plate 48. Multiple sets of limiting rods 412 are fixedly connected to the top of the lifting plate 44, and the limiting rods 412 move synchronously with the lifting plate 44. The limiting rods 412 pass through the moving plate 41 and slide against it. A limiting sleeve 413 is fitted around the outer ring of the limiting rods 412, and the limiting sleeve 413 is fixedly connected to the moving plate 41. The limiting action of the limiting rods 412 and the limiting sleeve 413 ensures smooth movement of the lifting plate 44. The top of the limiting rod 412 is fixedly connected to the limiting plate 414 to prevent the lifting plate 44 from moving too far downward, which would cause the limiting rod 412 to disengage from the limiting cylinder 413.

[0035] Furthermore, the aforementioned packing device also includes a clearance mechanism 5 disposed on the side of the mobile trolley 1. The clearance mechanism 5 is used to adjust the relative position of the compaction component 4 and the borehole. The clearance mechanism 5 includes a third push rod motor 51 vertically mounted on the side of the mobile trolley 1 near the compaction component 4. The output end of the third push rod motor 51 is fixedly connected to a first connecting plate 52. A connecting frame 53 is fixedly connected to one side of the first connecting plate 52. After the third push rod motor 51 is started, it drives the connecting frame 53 to move up and down through the first connecting plate 52, thereby adjusting the distance between the bottom of the discharge hopper 34 and the borehole. When adding packing material, the discharge hopper 34 is brought closer to the borehole, and when the device moves, the discharge hopper 34 is moved away from the ground. Multiple sets of first sliders 54 are fixedly connected to the side of the connecting frame 53 near the mobile trolley 1. A first slide rail 55 is slidably connected to the first slider 54. An installation block 56 is fixedly connected between the first slide rail 55 and the mobile trolley 1. The limiting effect of the first sliders 54 and the first slide rail 55 makes the movement of the connecting frame 53 smooth. The connecting frame 53 is a box-shaped structure with openings at both ends. A horizontally positioned fourth push rod motor 57 is installed within the connecting frame 53. A second connecting plate 58 is fixedly connected to the output end of the fourth push rod motor 57. The second connecting plate 58 passes through one side of the connecting frame 53 and slides against it. One end of the second connecting plate 58 is fixedly connected to a moving plate 41. After starting, the fourth push rod motor 57 drives the moving plate 41 to move horizontally via the second connecting plate 58. Multiple sets of second sliders 59 are fixedly connected to the side of the moving plate 41 near the connecting frame 53. Second slide rails 510 are slidably connected to the second sliders 59 and are fixedly connected to the connecting frame 53. The arrangement of the second sliders 59 and second slide rails 510 ensures smooth movement of the moving plate 41. By adjusting the positions of the discharge hopper 34 and the pressure plate 48 above the blast hole after starting the fourth push rod motor 57, the compaction operation after filling is achieved. Simultaneously, the small-amplitude adjustment of the fourth push rod motor 57, combined with the small-distance movement of the moving trolley 1, allows the pressure plate 48 to perform comprehensive compaction of the inside of the blast hole.

[0036] It is worth mentioning that all the aforementioned power-consuming units are powered by the power supply in the mobile trolley 1, and the operation of each component is controlled by the control module in the trolley. Before use, the device is inspected for issues such as cable wear, loose joints, and water ingress into the motor to prevent leakage from causing the metal casing of the equipment to become electrified, thus avoiding triggering the detonator. Monitoring can also be performed using sensors. All connecting wires in the device use electromagnetically shielded cables to avoid electromagnetic interference and prevent induced voltage and current from igniting the detonator.

[0037] In this embodiment, the entire device is first moved to the area of ​​the blast hole to be filled by a mobile trolley 1, and the photoelectric sensor in the prior art is used to achieve accurate positioning of the device at the blast hole. All electrical units of the device are powered by the power supply in the mobile trolley 1, and the working status of each component is uniformly controlled by the control module in the mobile trolley 1.

[0038] After positioning is completed, the third push rod motor 51 starts, driving the connecting frame 53 to move up and down via the first connecting plate 52. During this process, the first slider 54 on one side of the connecting frame 53 slides along the first slide rail 55 to ensure smooth movement of the connecting frame 53, ultimately adjusting the discharge hopper 34 to a suitable height close to the blast hole opening. Subsequently, the fourth push rod motor 57, horizontally arranged inside the connecting frame 53, starts, driving the moving plate 41 to move horizontally via the second connecting plate 58. The second slider 59 on one side of the moving plate 41 slides along the second slide rail 510, making the discharge hopper 34 accurately aligned with the blast hole opening.

[0039] Next, the first push rod motor 32 is activated, driving the baffle 33 to move upward, opening the discharge port 21 at the bottom of the material box 2. The filling sand and rock powder contained in the material box 2 enters the inclined discharge trough 31 through the discharge port 21. At the same time, the vibration motor 35 at the bottom of the material box 2 and the discharge trough 31 is activated. Vibration prevents the filling material from clogging in the material box 2 and the discharge trough 31, ensuring that the material slides smoothly down the discharge trough 31 to the discharge hopper 34, and is then guided by the discharge hopper 34 into the blast hole. The support rod 12 between the moving trolley 1 and the discharge trough 31 ensures that the position of the discharge trough 31 is firmly fixed. When the filling amount reaches the required level, the first push rod motor 32 drives the baffle 33 to move downward, closing the discharge port 21 and stopping the filling. The filling amount is controlled by controlling the opening time of the baffle 33, and the filling amount does not need to be accurately calculated.

[0040] After filling is completed, the fourth pusher motor 57 drives the moving plate 41 to move horizontally again, adjusting the pressure plate 48 of the compaction component 4 to be directly above the borehole. Then, the second pusher motor 42 at the top of the moving plate 41 is activated, its output end driving the lifting plate 44 downwards via the mounting plate 43. The lifting plate 44 drives the moving cylinder 45 to move downwards synchronously, so that the pressure plate 48, connected to the moving block 46 inside the moving cylinder 45 via the connecting rod 47, contacts the filling material inside the borehole. As the second pusher motor 42 continues to extend, the mounting plate 43 and the lifting plate 44 continue to descend, compressing the spring 49 inside the moving cylinder 45. The spring force of the spring 49 applies pressure to the pressure plate 48, compacting the filling material. Simultaneously, the pressure sensor 411 at the bottom of the mounting plate 43 detects the spring force of the spring 49 in real time and feeds the detection data back to the control module. When the pressure reaches the upper limit of the preset safety range, the control module controls the second pusher motor 42 to stop extending, preventing excessive pressure on the pressure plate 48 from causing safety hazards. After compaction, the second push rod motor 42 retracts to reset all components, and the third push rod motor 51 drives the connecting frame 53 to rise, causing the discharge hopper 34 to move away from the ground. The entire device is then moved to the next blast hole position by the moving trolley 1, and the above operation process is repeated.

[0041] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A blast hole filling device for open-pit mining, characterized in that, include: A mobile trolley (1) has a material box (2) fixedly connected to its top via a mounting bracket (11). A filling mechanism (3) is provided on one side of the material box (2), the filling mechanism (3) being used to discharge filling material into the borehole; The compaction assembly (4) installed on the side of the filling mechanism (3) is used to compact the filling material in the borehole while ensuring that the pressure is within a safe range. A clearance mechanism (5) is provided on the side of the mobile trolley (1), which is used to adjust the relative position of the compaction component (4) and the blast hole.

2. The hole-filling device for open-pit mining according to claim 1, characterized in that, The filling mechanism (3) includes a discharge trough (31) fixedly connected to the bottom of the material box (2). The discharge trough (31) is inclined. A first push rod motor (32) installed on the side of the material box (2) is provided above the discharge trough (31). A baffle (33) is fixedly connected to the output end of the first push rod motor (32). The baffle (33) is slidably connected in the discharge trough (31). A discharge hopper (34) is provided below the end of the discharge trough (31) away from the material box (2).

3. The blast hole filling device for open-pit mining according to claim 2, characterized in that, The bottom of the material box (2) is provided with a discharge port (21) corresponding to the discharge trough (31). Multiple sets of support rods (12) are fixedly connected between the moving trolley (1) and the discharge trough (31). Vibration motors (35) are installed at the bottom of both the material box (2) and the discharge trough (31).

4. The blast hole filling device for open-pit mining according to claim 3, characterized in that, The compaction component (4) includes a movable plate (41) fixedly connected to the outside of the discharge hopper (34). The movable plate (41) is L-shaped. A second push rod motor (42) is installed on the top of the movable plate (41). The output end of the second push rod motor (42) passes through the movable plate (41) and is fixedly connected to an installation plate (43). A lifting plate (44) is fixedly connected to the bottom of the installation plate (43). A movable cylinder (45) is installed at the bottom of the lifting plate (44). A movable block (46) is slidably connected in the movable cylinder (45). A connecting rod (47) is fixedly connected to the bottom of the movable block (46). A pressure plate (48) is fixedly connected to the bottom of the connecting rod (47). The pressure plate (48) is made of wood.

5. A blast hole filling device for open-pit mining according to claim 4, characterized in that, A spring (49) is provided above the moving block (46) and located in the moving cylinder (45). A detection plate (410) is provided above the spring (49) and is slidably connected in the moving cylinder (45). A pressure sensor (411) is installed at the bottom of the mounting plate (43). The detection end of the pressure sensor (411) is in contact with the detection plate (410). A through hole (415) is opened at the corresponding position of the lifting plate (44) and the pressure sensor (411).

6. A blast hole filling device for open-pit mining according to claim 5, characterized in that, The top of the lifting plate (44) is fixedly connected to multiple sets of limiting rods (412). The limiting rods (412) pass through the moving plate (41) and slide with it. The outer ring of the limiting rods (412) is fitted with a limiting cylinder (413). The limiting cylinder (413) is fixedly connected to the moving plate (41). The top of the limiting rods (412) is fixedly connected to a limiting plate (414).

7. A blast hole filling device for open-pit mining according to claim 6, characterized in that, The yielding mechanism (5) includes a third push rod motor (51) vertically mounted on the side of the mobile trolley (1) near the compaction component (4). The output end of the third push rod motor (51) is fixedly connected to a first connecting plate (52). A connecting frame (53) is fixedly connected to one side of the first connecting plate (52). Multiple sets of first sliders (54) are fixedly connected to the side of the connecting frame (53) near the mobile trolley (1). A first slide rail (55) is slidably connected in the first slider (54). An installation block (56) is fixedly connected between the first slide rail (55) and the mobile trolley (1).

8. A blast hole filling device for open-pit mining according to claim 7, characterized in that, The connecting frame (53) is a box-shaped structure with openings at both ends. A horizontally arranged fourth push rod motor (57) is installed in the connecting frame (53). A second connecting plate (58) is fixedly connected to the output end of the fourth push rod motor (57). The second connecting plate (58) passes through one side of the connecting frame (53) and slides with it. One end of the second connecting plate (58) is fixedly connected to the moving plate (41). Multiple sets of second sliders (59) are fixedly connected to the side of the moving plate (41) near the connecting frame (53). A second slide rail (510) is slidably connected in the second slider (59). The second slide rail (510) is fixedly connected to the connecting frame (53).

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