A lifting device for seed processing

Abstract

This invention discloses a lifting device for seed processing and transportation. It utilizes multiple dust removal modules instead of a single dust removal device in existing technologies, resulting in a smaller size and less noise. Furthermore, in the event of a single dust removal module failure, the other modules can assist in controlling dust concentration without requiring the main body of the elevator to be shut down for maintenance, thus increasing the safety of the elevator and facilitating the maintenance of the dust removal module's detection accuracy and efficiency. The invention also incorporates buffer steps and buffer supports, using the impact between the buffer steps and buffer supports to control the speed of the sliding inner frame, preventing it from sliding directly out of the fixed outer frame and thus reducing the risk of damage to the inner frame and dust collection unit. Additionally, pressure relief holes and sealing bolts provide new pressure relief locations for the dust removal modules, further enhancing the safety of the elevator.

Description

Technical Field

[0001] This invention relates to the field of seed processing and transportation, and in particular to a lifting device for seed processing. Background Technology

[0002] Most seed elevators use the bucket elevator principle, fixing a series of buckets on a circular transmission chain or belt. After the equipment starts, the buckets scoop up seeds from the bottom inlet, move upwards with the transmission device to the top, and flip over as they pass over the top roller, pouring the seeds into the outlet, thus completing the vertical conveying.

[0003] The invention patent with announcement number CN108263833B discloses a bucket elevator and a method for controlling dust generation in a bucket elevator. By setting up a pressure-reducing dust removal channel, a certain dust removal effect can be achieved during the reverse material dropping process. At the same time, by reducing the pressure of the conveying channel, the pressure of the airflow generated by the reverse material dropping is reduced accordingly, slowing down the falling speed of the material. This prevents the material from forming dust inside the conveying channel due to the large impact force when it falls to the bottom and being discharged from the feeding channel. This fundamentally solves the problem of dust being generated and discharged from the feeding channel by the airflow pressure of the material to be conveyed at the bottom.

[0004] The invention patent with announcement number CN117104772B discloses a bucket elevator, whose dust collection component can handle small impurities and dust, effectively preventing dust from being generated when materials fall and ensuring a safe working environment.

[0005] Because seeds are easily covered in dust, the dust can be shaken off during seed transport using a hoist. This dust can easily disperse within the relatively sealed hoist. If the dust concentration is too high, sparks generated by friction between the components of the seed hoist during transport can easily trigger an explosion. Therefore, seed hoisting devices usually need to be equipped with dust removal devices. Most existing dust removal devices use a single negative pressure pump to extract air from the seed hoist to ensure that the dust concentration inside the hoist is not too high. This method is simple and effective. However, such large-scale dust removal equipment also has drawbacks such as large size, difficult maintenance and repair, and high noise levels. In addition, if the dust removal equipment malfunctions, the entire seed hoist usually needs to be shut down for maintenance to ensure operational safety, which affects seed transport efficiency. Summary of the Invention

[0006] The core of this invention lies in using multiple dust removal modules to replace the single dust removal equipment in the prior art, thus solving the problems of existing dust removal equipment, which are large in size, difficult to maintain and repair, and noisy. In addition, once the dust removal equipment fails, the entire seed elevator usually needs to be shut down for maintenance, which affects the seed conveying efficiency.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A seed processing lifting device includes a lifting machine body, which includes an outer frame. Multiple dust removal holes are drilled in the side walls of the outer frame. A dust removal module is fixedly connected to each dust removal hole. Each dust removal module includes a fixed outer frame and a movable inner frame that match each other. The movable inner frame is inserted into the fixed outer frame. A guide ring is fixedly connected to the end of the movable inner frame near the fixed outer frame. Flow holes are formed in the side walls of both the guide ring and the movable inner frame. A dust collection unit is placed inside the movable inner frame. An electromagnetic ring is fixedly connected to the inner side wall of the fixed outer frame away from the outer frame. A sliding wing is fixedly connected to the end of the movable inner frame near the fixed outer frame. A magnetic ring is fixedly connected to one end of the sliding wing near the electromagnetic ring, and the magnetic force generated by the electromagnetic ring after being energized will attract the magnetic ring. A compression spring is fixedly connected between the sliding wing and the electromagnetic ring. A negative pressure fan is fixedly connected to the opening on the side of the fixed outer frame near the outer frame of the hoist. Multiple dust removal modules are used to replace the single dust removal equipment in the existing technology. The size is relatively small and the noise generated is relatively less. At the same time, when a single dust removal module fails, the other dust removal modules can assist in controlling the dust concentration without the need to shut down the main body of the hoist for maintenance, thus increasing the safety of the main body of the hoist.

[0009] Furthermore, a sealing ring is provided between the fixed outer frame and the hoist outer frame. The sealing ring is made of elastic material to increase the sealing effect of the fixed outer frame installation.

[0010] Furthermore, multiple notches are cut at the end of the sliding wing closest to the inner wall of the fixed outer frame, making the overall movement of the movable inner frame smoother and less prone to blockage due to air pressure.

[0011] Furthermore, a dust sensor is fixedly connected to the lower end of the fixed outer frame. The detection part of the dust sensor passes through and extends into the outer frame of the elevator. By using the dust sensor to detect the dust concentration inside the outer frame of the elevator, the operation of the dust removal module can be controlled more accurately, reducing energy consumption and lowering the risk of explosion.

[0012] Furthermore, the negative pressure fan is periodically started without operation, and the power supply of the negative pressure fan is random during non-operational startup. The negative pressure fan is used to detect the working status of the dust sensor to ensure that the dust sensor is in normal working condition.

[0013] Furthermore, a fluorescent strip is fixedly connected to the side wall of the movable inner frame, and a photosensitive unit is fixedly connected to the end of the movable inner frame away from the outer frame of the elevator, which is used to detect whether the dust collection unit is approaching saturation.

[0014] Optionally, multiple buffer feet are fixedly connected to the side wall of the movable inner frame to replace the sliding wing edge. A buffer step is fixedly connected between the electromagnetic ring and the inner wall of the fixed outer frame. Multiple pre-made grooves are carved on the buffer feet. The depth of the pre-made grooves increases with the distance from the movable inner frame. The projection of the multiple pre-made grooves along the axial direction of the fixed outer frame falls on the platform of the buffer step. When the air pressure inside the hoist body suddenly rises, the speed at which the movable inner frame slides outward due to the air pressure is reduced. This makes it less likely for the movable inner frame to be ejected from the fixed outer frame due to the sudden increase in air pressure, thus preventing damage to the movable inner frame and the dust collection unit, and preventing the dust captured by the dust collection unit from being re-raised.

[0015] Furthermore, pressure relief holes are drilled on the buffer step and the fixed outer frame. Sealing bolts are inserted into the pressure relief holes. The sealing bolts include bolt bodies, which are fixed to the buffer step with glue. A winding groove is drilled on the bolt body, and a connecting cable is coiled in the winding groove. Both ends of the connecting cable are fixedly connected to the opposite side wall of the winding groove. When the air pressure inside the hoist body suddenly rises, the pressure relief holes form a new ventilation channel for pressure relief.

[0016] Compared with the prior art, the advantages of this invention are:

[0017] This solution utilizes multiple dust collection modules instead of the single dust collection device in existing technologies. These modules are relatively smaller in size and generate less noise. Furthermore, in the event of a single dust collection module failure, the other modules can assist in controlling the dust concentration without requiring the main elevator to be shut down for maintenance, thus increasing the safety of the elevator. The introduction of fluorescent strips and photosensitive units allows for the determination of the amount of dust captured by the dust collection units, enabling timely replacement of units approaching saturation. The periodic replacement of dust collection modules also facilitates the cleaning and replacement of the negative pressure fan and dust sensor, making it easy to maintain the detection accuracy and working efficiency of the dust collection modules.

[0018] Meanwhile, buffer steps and buffer supports were introduced. The impact of the buffer steps and buffer supports controls the speed of the sliding of the movable inner frame. This prevents the movable inner frame from sliding directly out of the fixed outer frame due to excessive air pressure inside the outer frame of the hoist, thus reducing the risk of damage to the movable inner frame and dust collection unit, and preventing the dust captured by the dust collection unit from being re-raised. At the same time, pressure relief holes and sealing bolts were introduced to provide a new pressure relief position for the dust removal module, further increasing the safety of the hoist body. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the seed processing lifting device of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of the seed processing lifting device of the present invention. Figure 2 ;

[0021] Figure 3 This is a cross-sectional schematic diagram of the seed processing lifting device according to the first embodiment of the present invention;

[0022] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0023] Figure 5 This is a schematic diagram of the dust removal module according to the first embodiment of the present invention. Figure 1 ;

[0024] Figure 6 This is a schematic diagram of the dust removal module according to the first embodiment of the present invention. Figure 2 ;

[0025] Figure 7 This is a cross-sectional schematic diagram of the dust removal module according to the second embodiment of the present invention;

[0026] Figure 8 for Figure 7 Schematic diagram of the structure at point B;

[0027] Figure 9 for Figure 7 A schematic diagram of the structure at point C.

[0028] Explanation of the labels in the diagram:

[0029] 1. Elevator body, 101. Elevator outer frame, 102. Feed inlet, 103. Discharge outlet, 104. Power motor, 105. Transmission roller, 106. Transmission belt, 107. Hopper, 2. Dust removal module, 201. Fixed outer frame, 202. Sealing ring, 203. Movable inner frame, 204. Notch, 205. Flow hole, 206. Electromagnetic ring, 207. Magnetic ring, 208. Compression spring, 209. Fluorescent strip, 210. Photosensitive unit, 211. Buffer step, 212. Buffer support foot, 213. Precast trough, 3. Negative pressure fan, 4. Dust collection unit, 5. Dust sensor, 6. Sealing unit, 7. Sealing bolt, 701. Bolt body, 702. Connecting cable. Detailed Implementation

[0030] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0031] First implementation method:

[0032] Please see Figure 1-6A seed processing lifting device includes a lifting machine body 1, which includes an lifting machine outer frame 101. An inlet 102 and an outlet 103 are respectively provided on opposite side walls of the lifting machine outer frame 101, with the outlet 103 located above the inlet 102. A pair of transmission rollers 105 are rotatably connected to the inner side wall of the lifting machine outer frame 101. A transmission belt 106 is sleeved on the outer side of the two transmission rollers 105. Multiple hoppers 107 are fixedly connected to the transmission belt 106. One end of the upper transmission roller 105 extends through and to the outer side of the lifting machine outer frame 101. A mounting bracket is fixedly connected to the side wall of the lifting machine outer frame 101, and a power motor 104 is fixedly connected to the mounting bracket. A conveyor belt connects the power output end of the power motor 104 to the upper transmission roller 105.

[0033] The power motor 104 drives the upper transmission roller 105 to rotate via the conveyor belt. The transmission belt 106 and the hopper 107 rotate under the drive of the upper transmission roller 105. At the same time, the seeds enter the outer frame 101 of the elevator through the feed port 102 and are gradually transported from the bottom to the top under the action of the hopper 107. When the hopper 107 turns past the upper transmission roller 105, the seeds in the hopper 107 are thrown out from the discharge port 103 by centrifugal force, completing the seed lifting process. The above overall process is the prior art. Those skilled in the art can reasonably control each structure according to the prior art to meet the usage requirements.

[0034] The outer frame 101 of the elevator has multiple dust removal holes on its side walls, which are equipped with an inlet 102 and an outlet 103. A dust removal module 2 is fixedly connected to each dust removal hole. The dust removal module 2 includes a matching fixed outer frame 201 and a movable inner frame 203. The movable inner frame 203 is inserted into the fixed outer frame 201. A guide ring is fixedly connected to one end of the movable inner frame 203 near the fixed outer frame 201. Both the guide ring and the side walls of the movable inner frame 203 have flow holes 205. A dust collection unit 4 is placed inside the movable inner frame 203 (the dust collection unit 4 can be activated carbon wrapped in a metal mesh frame, and the material of the dust collection unit 4 has…). (The body selection can be made by those skilled in the art according to actual use). An electromagnetic ring 206 is fixedly connected to the inner wall of the fixed outer frame 201 away from the hoist outer frame 101. A sliding wing is fixedly connected to the end of the movable inner frame 203 near the fixed outer frame 201. A magnetic ring 207 is fixedly connected to the end of the sliding wing near the electromagnetic ring 206. The magnetic force generated by the electromagnetic ring 206 after being energized will attract the magnetic ring 207. A compression spring 208 is fixedly connected between the sliding wing and the electromagnetic ring 206. A negative pressure fan 3 is fixedly connected to the opening on the side of the fixed outer frame 201 near the hoist outer frame 101.

[0035] The fixed outer frame 201 is fixedly connected to the hoist outer frame 101 by multiple screws, which facilitates installation and subsequent disassembly.

[0036] When the main body 1 of the hoist is working normally, the electromagnetic ring 206 and the negative pressure fan 3 will be activated at regular intervals. After the electromagnetic ring 206 is energized, it will attract the magnetic ring 207, thereby driving the movable inner frame 203 to slide. Multiple flow holes 205 will be exposed from the fixed outer frame 201 in sequence. At this time, the hoist outer frame 101 and the outside world are connected by the movable inner frame 203. Under the action of the negative pressure fan 3, the dust in the hoist outer frame 101 is blown into the movable inner frame 203, filtered by the dust collection unit 4, and discharged from the flow holes 205. The guide ring on the movable inner frame 203 can extend the length of the air flow to a certain extent and increase the dust collection unit 4's adsorption effect on dust. The opening of multiple flow holes 205 can reduce the possibility that the dust removal module 2 cannot flow normally due to partial blockage of the dust collection unit 4.

[0037] A sealing ring 202 is provided between the fixed outer frame 201 and the hoist outer frame 101. The sealing ring 202 is made of elastic material to increase the sealing effect of the fixed outer frame 201. Multiple notches 204 are chiseled at the end of the sliding wing near the inner wall of the fixed outer frame 201, so that the movable inner frame 203 moves more smoothly and is less likely to be blocked by air pressure.

[0038] A dust sensor 5 is fixedly connected to the lower end of the fixed outer frame 201. The detection part of the dust sensor 5 passes through and extends into the outer frame 101 of the hoist. The dust sensor 5 detects the dust concentration inside the outer frame 101 of the hoist. When the dust concentration reaches the preset threshold, the electromagnetic ring 206 and the negative pressure fan 3 are started. This allows for more precise control of the dust removal module 2, reduces energy consumption, and lowers the risk of explosion.

[0039] The negative pressure fan 3 periodically starts up when not in operation, and the power supply of the negative pressure fan 3 is random during non-operational startup. The wind generated by the negative pressure fan 3 interferes with the dust environment at the location of the dust sensor 5. When the detection data of the dust sensor 5 changes with the startup of the negative pressure fan 3, the dust sensor 5 is in normal working condition. However, when the detection data of the dust sensor 5 does not change with the startup of the negative pressure fan 3, it indicates that the dust sensor 5 is in abnormal working condition and the current dust removal module 2 needs to be maintained in time.

[0040] A fluorescent strip 209 is fixedly connected to the side wall of the movable inner frame 203. A photosensitive unit 210 is fixedly connected to the end of the movable inner frame 203 away from the outer frame 101 of the elevator. When the dust in the dust collection unit 4 is close to saturation, its weight will also increase. After the electromagnetic ring 206 is de-energized, the elastic force generated by the deformation of the compression spring 208 can no longer push the movable inner frame 203 to move. At this time, the fluorescent strip 209 is exposed on the outside of the fixed outer frame 201. Ten seconds after the electromagnetic ring 206 stops working, the photosensitive unit 210 can still detect the specified color fluorescence emitted by the fluorescent strip 209, indicating that the movable inner frame 203 is in a critical saturation state. The electromagnetic ring 206 and the negative pressure fan 3 of the adjacent dust removal module 2 are activated to share the dust removal pressure of the previous position, and the corresponding communication equipment is used to remind the maintenance personnel to replace the dust removal module 2 in time.

[0041] A sealing unit 6 is also inserted into the dust removal hole to replace the dust removal module 2. In actual use, the gap between the main body 1 of the elevator and the external object in some places is insufficient to install the dust removal module 2. At this time, the sealing unit 6 can be used to seal the dust removal hole to ensure that the outer frame 101 of the elevator is relatively sealed. Figure 2 and Figure 3 The use of sealing unit 6 is only shown and does not mean that the dust removal hole on the same side needs to be sealed using both dust removal module 2 and sealing unit 6. Technicians can prioritize installing dust removal module 2 based on actual working conditions and space permitting.

[0042] The control and power supply methods of the electrical units (including but not limited to the power motor 104, electromagnetic ring 206, negative pressure fan 3, and dust sensor 5, etc.) in this application are all well-known technologies to those skilled in the art. Those skilled in the art can make reasonable settings based on the existing technology to meet the usage requirements of this application.

[0043] In this application, multiple dust removal modules 2 are used instead of the single dust removal device in the prior art. They are relatively small in size and generate less noise. At the same time, when a single dust removal module 2 fails, the other dust removal modules 2 can assist in controlling the dust concentration without requiring the elevator body 1 to be shut down for maintenance, thus increasing the safety of the elevator body 1. In addition, the introduction of fluorescent strip 209 and photosensitive unit 210 can determine the amount of dust captured by dust collection unit 4, and then replace the dust collection unit 4 in time when it is about to be saturated. At the same time, the regularly replaced dust removal modules 2 can also facilitate the cleaning and replacement of negative pressure fan 3 and dust sensor 5, making it easy to maintain the detection accuracy and working efficiency of dust removal module 2.

[0044] Second implementation method:

[0045] In the first embodiment, once the air pressure inside the outer frame 101 of the hoist rises rapidly due to the explosion, the movable inner frame 203 will slide rapidly inside the fixed outer frame 201 under the action of air pressure. The high-speed moving movable inner frame 203 is likely to damage the fixed outer frame 201 and be ejected directly from the fixed outer frame 201.

[0046] Please see Figures 7-9 Multiple buffer feet 212 are fixedly connected to the side wall of the movable inner frame 203 to replace the sliding wing. A buffer step 211 is fixedly connected between the electromagnetic ring 206 and the inner wall of the fixed outer frame 201. Multiple pre-made grooves 213 are carved on the buffer feet 212. The depth of the pre-made grooves 213 increases with the distance from the movable inner frame 203. The projections of the multiple pre-made grooves 213 along the axial direction of the fixed outer frame 201 all fall on the platform of the buffer step 211. When the pressure inside the elevator body 1 continues to rise and cannot be properly relieved through the feed port 102, discharge port 103 and movable inner frame 203, the air inside the elevator outer frame 101 will push the movable inner frame 203. As the frame 203 moves further away from the outer frame 101 of the elevator, the buffer support 212, under the action of the compression spring 208 and the impact with the buffer step 211, undergoes a controllable break along the precast groove 213. The buffer support 212 breaks sequentially from the outside to the inside, reducing the speed at which the movable inner frame 203 slides outward due to air pressure. This makes it easier for the movable inner frame 203 to be stopped by the fixed outer frame 201. The movable inner frame 203 is less likely to be ejected from the fixed outer frame 201 due to a sudden increase in air pressure, thus preventing damage to the movable inner frame 203 and the dust collection unit 4, and preventing the dust captured by the dust collection unit 4 from being re-raised.

[0047] Pressure relief holes are drilled in the buffer step 211 and the fixed outer frame 201. A sealing plug 7 is inserted into the pressure relief hole. The sealing plug 7 includes a plug body 701, which is fixed to the buffer step 211 with glue. A winding groove is drilled in the plug body 701, and a connecting cable 702 is coiled in the winding groove. Both ends of the connecting cable 702 are fixedly connected to the opposite side wall of the winding groove. During the sliding process of the movable inner frame 203, the buffer support leg 212 will break off one end of the plug body 701 that extends into the fixed outer frame 201 and disconnect the connection between the plug body 701 and the buffer step 211. The part of the plug body 701 inserted into the pressure relief hole will be ejected from the pressure relief hole under the action of air pressure. The pressure relief hole forms a new ventilation channel for pressure relief. The setting of the connecting cable 702 can make the part of the plug body 701 inserted into the pressure relief hole subject to traction, making it difficult to be ejected directly and causing safety accidents. The setting of the sealing plug 7 can effectively prevent the pressure relief hole from being blocked by foreign objects under normal conditions.

[0048] Compared to the first embodiment, this embodiment introduces a buffer step 211 and a buffer support 212. The impact of the buffer step 211 and the buffer support 212 controls the speed at which the movable inner frame 203 slides outward, making it less likely for the movable inner frame 203 to slide directly out of the fixed outer frame 201 due to excessive air pressure inside the outer frame 101 of the elevator. This reduces the risk of damage to the movable inner frame 203 and the dust collection unit 4, and prevents the dust captured by the dust collection unit 4 from being re-raised. At the same time, a pressure relief hole and a sealing bolt 7 are introduced to provide a new pressure relief position for the dust removal module 2, further increasing the safety of the elevator body 1. However, compared to the dust removal module 2 of the first embodiment, the processing cost of this dust removal module 2 is significantly increased, requiring those skilled in the art to make reasonable selections based on actual usage needs.

[0049] Finally, for ease of illustration, the various structures in the accompanying drawings of this application are not drawn to scale. Those skilled in the art can reasonably design the quantity and size of each structure according to actual examination needs to meet the usage requirements of this application.

[0050] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A lifting device for seed processing, comprising a lifting machine body (1), wherein the lifting machine body (1) includes a lifting machine outer frame (101), characterized in that: Multiple dust removal holes are drilled on the side wall of the elevator outer frame (101). A dust removal module (2) is fixedly connected to each dust removal hole. The dust removal module (2) includes a fixed outer frame (201) and a movable inner frame (203) that match each other. The movable inner frame (203) is inserted into the fixed outer frame (201). A guide ring is fixedly connected to one end of the movable inner frame (203) near the fixed outer frame (201). Both the guide ring and the side wall of the movable inner frame (203) are provided with flow holes (205). A dust collection unit (4) is placed in the movable inner frame (203). The fixed outer frame (201) is far away from the dust collection unit (4). An electromagnetic ring (206) is fixedly connected to the inner wall of one end of the hoist outer frame (101). A sliding wing is fixedly connected to the end of the movable inner frame (203) near the fixed outer frame (201). A magnetic ring (207) is fixedly connected to the end of the sliding wing near the electromagnetic ring (206). The magnetic force generated by the electromagnetic ring (206) after being energized will attract the magnetic ring (207). A compression spring (208) is fixedly connected between the sliding wing and the electromagnetic ring (206). A negative pressure fan (3) is fixedly connected to the opening on the side of the fixed outer frame (201) near the hoist outer frame (101).

2. The lifting device for seed processing according to claim 1, characterized in that: A sealing ring (202) is provided between the fixed outer frame (201) and the hoist outer frame (101), and the sealing ring (202) is made of elastic material.

3. The lifting device for seed processing according to claim 1, characterized in that: The sliding wing has multiple notches (204) cut at one end near the inner wall of the fixed outer frame (201).

4. The lifting device for seed processing according to claim 1, characterized in that: A dust sensor (5) is fixedly connected to the lower end of the fixed outer frame (201), and the detection part of the dust sensor (5) passes through and extends into the outer frame (101) of the elevator.

5. The lifting device for seed processing according to claim 1, characterized in that: The negative pressure fan (3) is periodically started without operation, and the power supply of the negative pressure fan (3) is random when it is started without operation.

6. The lifting device for seed processing according to claim 1, characterized in that: A fluorescent strip (209) is fixedly connected to the side wall of the movable inner frame (203), and a photosensitive unit (210) is fixedly connected to the end of the movable inner frame (203) away from the outer frame (101) of the elevator.

7. The lifting device for seed processing according to claim 1, characterized in that: Multiple buffer legs (212) are fixedly connected to the side wall of the movable inner frame (203) to replace the sliding wing. A buffer step (211) is fixedly connected between the electromagnetic ring (206) and the inner wall of the fixed outer frame (201). Multiple pre-made grooves (213) are carved on the buffer legs (212). The depth of the pre-made grooves (213) increases with the distance from the movable inner frame (203). The projections of the multiple pre-made grooves (213) along the axial direction of the fixed outer frame (201) all fall on the platform of the buffer step (211).

8. The lifting device for seed processing according to claim 7, characterized in that: Pressure relief holes are drilled on the buffer step (211) and the fixed outer frame (201). A sealing bolt (7) is inserted into the pressure relief hole. The sealing bolt (7) includes a bolt body (701) and the bolt body (701) is fixed to the buffer step (211) with glue. A winding groove is drilled on the bolt body (701). A connecting cable (702) is coiled in the winding groove. Both ends of the connecting cable (702) are fixedly connected to the opposite side wall of the winding groove.

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