A dust-laden gas separation and recovery device in the calcium carbide-based acetylene production process

Abstract

This invention discloses a dust-laden gas separation and recovery device in the calcium carbide-based acetylene production process, belonging to the technical field of tail gas treatment in calcium carbide-based acetylene production. It includes a base, with a cyclone separator fixedly connected to the top of the base. A spray purification tower is fixedly connected to one side of the cyclone separator. A multi-stage filtration assembly is installed between the cyclone separator and the spray purification tower. An inlet buffer assembly is fixedly connected to the inlet end of the cyclone separator, and a discharge assembly is fixedly connected to the discharge end of the cyclone separator. This invention adopts a combination structure of cyclone coarse dust removal and three-stage gradient filtration, first removing large dust particles and then progressively intercepting fine dust. Compared with traditional single dust removal equipment, the dust removal accuracy is significantly improved, completely solving the problem of dust accumulation and blockage in subsequent pipelines and equipment. The multi-stage filtration assembly is equipped with a quick-release sealing cover and an electric limit structure, making filter media disassembly, cleaning, and replacement simple.

Description

Technical Field

[0001] This invention belongs to the field of tail gas treatment technology in calcium carbide acetylene production, specifically relating to a dust-containing gas separation and recovery device in the calcium carbide acetylene production process. Background Technology

[0002] In the calcium carbide-based acetylene production process, the reaction of calcium carbide with water to generate acetylene gas also produces a large amount of dust-laden acetylene gas containing calcium carbide dust and trace amounts of calcium carbide slag particles. If this dust-laden gas is directly transported to subsequent purification processes, the suspended solid dust can easily clog pipes, spray equipment, and filter components, significantly reducing the acetylene gas purification efficiency. Furthermore, dust accumulation can easily lead to equipment corrosion, abnormal pressure, and other problems, posing certain production safety hazards.

[0003] Currently, the industry mostly uses single cyclone dust collectors or simple bag filters to treat this type of dusty gas, which has obvious shortcomings: the dust removal accuracy of a single dust collector structure is insufficient, it can only remove large dust particles and cannot effectively intercept fine dust. Trace amounts of dust remain in the treated acetylene gas, and subsequent equipment is still prone to dust accumulation and blockage. In addition, the uneven airflow velocity and large pressure fluctuations not only reduce the dust removal and separation effect, but also pose safety risks caused by excessive pressure. Traditional dust removal and filter cleaning methods are cumbersome to operate, often requiring downtime, affecting production continuity, and the overall equipment operation and maintenance is inconvenient. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a dust-laden gas separation and recovery device for the calcium carbide-based acetylene production process, which features good treatment efficiency and ease of disassembly and dust removal.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dust-containing gas separation and recovery device in the calcium carbide acetylene production process, comprising a base, a cyclone separator fixedly connected above the base, a spray purification tower fixedly connected to one side of the cyclone separator, a multi-stage filtration assembly provided between the cyclone separator and the spray purification tower, an inlet buffer assembly fixedly connected to the inlet end of the cyclone separator, and a discharge assembly fixedly connected to the discharge end of the cyclone separator. The multi-stage filtration assembly includes a filter box, which is fixedly connected to the outlet end of the cyclone separator. A positioning seat is fixedly connected inside the filter box. A primary filter screen, a medium-efficiency filter cloth layer, and a high-efficiency microporous filter plate are installed sequentially from top to bottom inside the filter box through the positioning seat. A sealing cover is installed on the front side of the filter box. A rubber sealing ring is fixedly connected to one side of the sealing cover. The filter box and the sealing cover are fixed by a limiting component.

[0006] Preferably, the two ends of one side of the sealing cover are symmetrically and fixedly connected with positioning rods, and one side of the filter box is provided with positioning holes adapted to the positioning rods.

[0007] Preferably, the limiting component includes an electric telescopic rod, which is fixedly connected to both sides of the filter box, and a limiting frame is fixedly connected to one end of the electric telescopic rod.

[0008] Preferably, a handle is fixedly connected to one side of the sealing cap, and a rubber sleeve is fixedly fitted onto the surface of the handle. Anti-slip protrusions are fixedly connected around the surface of the rubber sleeve.

[0009] Preferably, the discharge assembly includes a discharge pipe, which is fixedly connected to the feed pipe of the cyclone separator. A discharge motor is fixedly connected to the lower part of the discharge pipe, and a spiral feed roller is fixedly connected to the output end of the discharge motor. The spiral feed roller and the discharge pipe are rotatably connected through a bearing. A feed pipe is fixedly connected to one side of the discharge pipe, and a sealing plate is fixedly connected to the other end of the feed pipe. A rubber sealing gasket is fixedly connected to the lower part of the sealing plate, and a collecting cylinder is abutted against the lower part of the rubber sealing gasket. A disassembly assembly is provided below the collecting cylinder.

[0010] Preferably, a solenoid valve is fixedly connected in the middle of the feed pipe.

[0011] Preferably, the disassembly and assembly assembly includes an electric telescopic rod II, which is fixedly connected to the top of the base, and a support plate is fixedly connected to the top of the electric telescopic rod II.

[0012] Preferably, a positioning ring is fixedly connected to the top of the support plate.

[0013] Preferably, the two ends of the support plate are slidably connected to stabilizing slide rods, the lower part of the stabilizing slide rods is fixedly connected to the base, and the upper part of the stabilizing slide rods is fixedly connected to a limit block.

[0014] Preferably, the air intake buffer assembly includes a buffer box, which is fixedly connected to the air intake end of the cyclone separator. A flow equalization plate is fixedly connected in the middle of the buffer box, and air vents are distributed in the middle of the flow equalization plate. An explosion-proof pressure relief valve is fixedly connected to one end of the buffer box at the top. A pressure sensor is fixedly connected to one end of the buffer box at the bottom. A mounting plate is fixedly connected below the pressure sensor. Fixing screws are inserted into both ends of the mounting plate and are threadedly connected to the buffer box. A support plate is fixedly connected to the bottom of the buffer box.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a combination structure of cyclone coarse dust removal and three-stage gradient filtration. It first removes large dust particles and then intercepts fine dust particles step by step. Compared with traditional single dust removal equipment, the dust removal accuracy is greatly improved, and the problem of dust accumulation and blockage in subsequent pipelines and equipment is completely solved. The multi-stage filtration components are equipped with quick-release sealing covers and electric limit structures, making filter media disassembly, cleaning, and replacement simple.

[0016] 2. The present invention is equipped with an air intake buffer, pressure monitoring and explosion-proof pressure relief structure at the front end, which can stabilize the airflow and control the system pressure in real time, effectively avoiding the safety hazards caused by unstable airflow and abnormal pressure during the acetylene production process.

[0017] 3. The material discharge component of this invention adopts a spiral conveyor anti-clogging structure, and is equipped with a solenoid valve and a liftable and detachable collection cylinder. Dust removal does not require equipment shutdown, ensuring continuous operation of the production line and improving production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the multi-stage filtration assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the limiting component of the present invention; Figure 5 This is a schematic diagram of the material discharge assembly of the present invention; Figure 6 This is a schematic diagram of the disassembly and assembly components of the present invention; Figure 7 This is a cross-sectional schematic diagram of the intake buffer assembly of the present invention.

[0019] In the diagram: 1. Base; 2. Cyclone separator; 3. Multi-stage filtration assembly; 31. Filter box; 32. Positioning seat; 39. Primary filter screen; 33. Medium-efficiency filter cloth layer; 34. High-efficiency microporous filter plate; 35. Sealing cover; 36. Rubber sealing ring; 37. Positioning rod; 38. Limiting assembly; 381. Electric telescopic rod one; 382. Limiting frame; 383. Handle; 384. Rubber sleeve; 385. Anti-slip protrusion; 4. Spray purification tower; 5. Discharge assembly; 51. Discharge pipe; 52. 53. Feeding motor; 54. Spiral feed roller; 55. Feeding pipe; 56. Sealing plate; 57. Collecting cylinder; 58. Rubber sealing gasket; 59. Disassembly assembly; 50. Electric telescopic rod II; 51. Bearing plate; 52. Positioning ring; 53. Stabilizing slide bar; 54. Limiting block; 6. Air inlet buffer assembly; 61. Buffer box; 62. Flow equalization plate; 63. Vent hole; 64. Explosion-proof pressure relief valve; 65. Pressure sensor; 66. Mounting plate; 67. Fixing screws; 68. Support plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-7 The present invention provides the following technical solution: a dust-containing gas separation and recovery device in the acetylene production process of calcium carbide method, including a base 1 for stable support of the device, a cyclone separator 2 fixedly connected above the base 1, which uses the principle of centrifugal force to separate large particles of coarse calcium carbide dust in the gas, a spray purification tower 4 fixedly connected to one side of the cyclone separator 2 to complete desulfurization, impurity removal and fine purification treatment, and finally transported to the subsequent process for recycling through the acetylene recovery pipeline, a multi-stage filter component 3 is set between the cyclone separator 2 and the spray purification tower 4 to intercept fine dust particles step by step to achieve high-precision purification of the gas, an inlet buffer component 6 fixedly connected to the air inlet end of the cyclone separator 2 to divert and decelerate the high-speed airflow, so that the gas enters the subsequent separation structure evenly and avoids incomplete separation caused by excessive local airflow, and a discharge component 5 fixedly connected to the discharge end of the cyclone separator 2. Please see Figure 3 The multi-stage filtration assembly 3 includes a filter box 31, which is fixedly connected to the outlet end of the cyclone separator 2. A positioning seat 32 is fixedly connected inside the filter box 31. Two positioning seats 32 are provided in the same group and are symmetrically fixedly connected to the lower part of the filter box 31. The filter box 31 is equipped with a primary filter screen 39, a medium-efficiency filter cloth layer 33 and a high-efficiency microporous filter plate 34 in sequence from top to bottom through the positioning seats 32. The positioning groove of the positioning seat 32 is the same size as the primary filter screen 39, the medium-efficiency filter cloth layer 33 and the high-efficiency microporous filter plate 34. A sealing cover 35 is installed on the front side of the filter box 31. One side of the sealing cover 35 fits tightly with the primary filter screen 39, the medium-efficiency filter cloth layer 33 and the high-efficiency microporous filter plate 34. A rubber sealing ring 36 is fixedly connected to one side of the sealing cover 35 to facilitate sealing the mounting surface of the sealing cover 35. The filter box 31 and the sealing cover 35 are fixed by a limiting assembly 38.

[0022] Please see Figure 3 The sealing cover 35 has two symmetrical and fixedly connected positioning rods 37 on one side. The filter box 31 has a positioning hole adapted to the positioning rods 37 on one side. The positioning hole and the positioning rods 37 are the same size to ensure that they are tightly inserted and facilitate the positioning of the sealing cover 35.

[0023] Please see Figure 4The limiting component 38 includes an electric telescopic rod 381, which is fixedly connected to both sides of the filter box 31. One end of the electric telescopic rod 381 is fixedly connected to a limiting frame 382. The groove in the middle of the limiting frame 382 is the same size as the groove in the filter box 31, ensuring that the primary filter screen 39, the medium-efficiency filter cloth layer 33, and the high-efficiency microporous filter plate 34 can pass through the limiting frame 382. In use, the electric telescopic rod 381 drives the limiting frame 382 to move, causing it to disengage from the sealing cover 35. The sealing cover 35 can then be removed, making it easy to pull out the primary filter screen 39, the medium-efficiency filter cloth layer 33, and the high-efficiency microporous filter plate 34 for cleaning or replacement.

[0024] Please see Figure 4 A handle 383 is fixedly connected to one side of the sealing cap 35, which allows for easy removal and placement of the sealing cap 35. A rubber sleeve 384 is fixedly fitted onto the surface of the handle 383, and anti-slip protrusions 385 are fixedly connected around the surface of the rubber sleeve 384 to provide an anti-slip effect.

[0025] Please see Figure 5 The discharge assembly 5 includes a discharge pipe 51, which is fixedly connected to the discharge pipe of the cyclone separator 2. A discharge motor 52 is fixedly connected to the lower part of the discharge pipe 51. A spiral feed roller 53 is fixedly connected to the output end of the discharge motor 52. The discharge motor 52 drives the spiral feed roller 53 to facilitate the smooth discharge of dust and prevent blockage. The spiral feed roller 53 and the discharge pipe 51 are rotatably connected by bearings. A feed pipe 54 is fixedly connected to one side of the discharge pipe 51 for conveying dust. A sealing plate 55 is fixedly connected to the other end of the feed pipe 54. A rubber sealing gasket 57 is fixedly connected to the lower part of the sealing plate 55. A collection cylinder 56 is abutted to the lower part of the rubber sealing gasket 57. The cross-section of the collection cylinder 56 is the same as that of the sealing plate 55 to facilitate sealing of the collection cylinder 56. A disassembly assembly 58 is provided below the collection cylinder 56. In use, the discharge motor 52 drives the spiral feed roller 53 to facilitate the smooth discharge of dust, which is then collected by the collection cylinder 56.

[0026] Please see Figure 5 A solenoid valve is fixedly connected in the middle of the discharge pipe 54 to facilitate the cutting off of the discharge pipe 54. After the collection cylinder 56 has finished collecting, the solenoid valve is closed, and then the discharge pipe 54 can be controlled to close, so that the device does not need to be stopped when cleaning the collection cylinder 56.

[0027] Please see Figure 6 The disassembly and assembly component 58 includes an electric telescopic rod 581, which is fixedly connected to the top of the base 1. A support plate 582 is fixedly connected to the top of the electric telescopic rod 581. The electric telescopic rod 581 drives the support plate 582 to move down, thereby driving the collection cylinder 56 to move down and separate from the sealing plate 55, so that the collection cylinder 56 can be removed for cleaning.

[0028] Please see Figure 6 A positioning ring 583 is fixedly connected above the support plate 582. The receiving groove of the positioning ring 583 is the same as that of the collection cylinder 56, which ensures the accurate installation of the collection cylinder 56. The positioning ring 583 facilitates the positioning of the collection cylinder 56.

[0029] Please see Figure 6 The two ends of the bearing plate 582 are slidably connected to the stabilizing slide rod 584. The lower part of the stabilizing slide rod 584 is fixedly connected to the base 1. The upper part of the stabilizing slide rod 584 is fixedly connected to the limiting block 585. The limiting block 585 is larger than the stabilizing slide rod 584 to prevent the bearing plate 582 and the stabilizing slide rod 584 from separating. The stabilizing slide rod 584 facilitates the stable lifting and lowering of the bearing plate 582.

[0030] Please see Figure 6 The intake buffer assembly 6 includes a buffer box 61, which is fixedly connected to the intake end of the cyclone separator 2. A flow equalization plate 62 is fixedly connected to the center of the buffer box 61. The flow equalization plate 62 is integrally formed from a single rectangular explosion-proof and anti-static steel plate. The flow equalization plate 62 is installed at an angle inside the buffer cavity, and its left and right sides, as well as its top and bottom ends, are sealed to the inner wall of the buffer cavity by welding. The plate completely seals the internal cross-section of the buffer cavity, enabling it to decelerate and evenly distribute the high-speed dust-laden airflow, achieving stable pretreatment of the dust-laden gas. Ventilation holes 63 are distributed in the center of the flow equalization plate 62. An explosion-proof pressure relief valve 64 is fixedly connected to one end of the buffer box 61. The lower part of the buffer box 61... A pressure sensor 65 is fixedly connected to one end, and a mounting plate 66 is fixedly connected to the lower part of the pressure sensor 65. Fixing screws 67 are inserted into both ends of the mounting plate 66, and the fixing screws 67 are threadedly connected to the buffer box 61. A support plate 68 is fixedly connected to the lower part of the buffer box 61. The pressure sensor 65 collects the gas pressure signal in the cavity in real time and transmits the pressure data to the controller of the device in real time. When the internal pressure of the equipment exceeds the acetylene process safety setting threshold, the controller immediately triggers the top explosion-proof pressure relief valve 64 to automatically open and relieve pressure. After the pressure returns to normal, it automatically closes. Unscrewing the fixing screws 67 makes it easy to remove the mounting plate 66 and the pressure sensor 65, which facilitates the cleaning and maintenance of the pressure sensor 65.

[0031] The working principle and usage process of this invention: The entire device is fixed and supported by the base 1. The dust-laden acetylene gas is first introduced into the intake buffer assembly 6. After the airflow enters the buffer box 61, it is deflected and slowed down by the flow equalization plate 62 and the evenly distributed air vents 63, achieving uniform flow across the entire area and eliminating airflow turbulence. The pressure sensor 65 monitors the internal air pressure of the buffer box 61 in real time. When the air pressure exceeds the safety threshold, the explosion-proof pressure relief valve 64 on the top of the buffer box 61 automatically opens to release pressure. After the pressure returns to normal, it automatically closes. The pressure sensor 65 is assembled by the mounting plate 66 and fixing screws 67, which can be quickly disassembled for maintenance. The buffer box 61 is stabilized by the support plate 68. The dust-laden gas after stabilization and pressure regulation is smoothly delivered to the cyclone separator 2.

[0032] After the gas enters the cyclone separator 2, coarse separation is completed by centrifugal force. Larger calcium carbide dust particles in the gas adhere to the wall of the separator and settle downwards under the action of centrifugal force, entering the discharge assembly 5 from the discharge end of the cyclone separator 2. Inside the discharge pipe 51, the screw feed roller 53 is continuously rotated by the discharge motor 52, and the dust is transported by the screw conveyor, effectively avoiding pipe blockage. The dust is transported along the discharge pipe 54, and the solenoid valve installed on the discharge pipe 54 can flexibly open and close the pipe. The dust finally passes through the sealing plate 55 and the rubber sealing gasket 57 and falls into the collection cylinder 56 for centralized collection. The collection cylinder 56 is positioned in the positioning ring 583 above the support plate 582. The support plate 582 is driven by the electric telescopic rod 581 to complete the lifting action. During the lifting process, the stable operation is maintained by the side stabilizing slide bars 584. The limit block 585 can prevent the support plate 582 from slipping. The lifting structure consists of a disassembly and assembly assembly 58, which can be used to disassemble, clean and reset the collection cylinder 56 without stopping the machine.

[0033] Acetylene gas, after coarse dust removal, enters the filter box 31 of the multi-stage filtration assembly 3 from the outlet of the cyclone separator 2. The gas flows from top to bottom through the primary filter screen 39, the medium-efficiency filter cloth layer 33, and the high-efficiency microporous filter plate 34. The three layers of filter media are supported and installed by the positioning seats 32 inside the filter box 31, intercepting residual fine dust in the gas step by step to achieve high-precision deep dust removal. A sealing cover 35 is set on the front of the filter box 31. The sealing cover 35 is precisely connected to the positioning holes of the filter box 31 by the positioning rods 37 at both ends, and the rubber sealing ring 36 ensures the sealing performance. The limiting components 38 on both sides of the filter box 31 are composed of an electric telescopic rod 381 and a limiting frame 382, ​​which can realize the locking and unlocking of the sealing cover 35. A handle 383 is provided on the outside of the sealing cover 35. The handle 383 is fitted with a rubber sleeve 384 with anti-slip protrusions 385, which makes it convenient for the staff to open the sealing cover 35 to clean, inspect or replace the internal filter media.

[0034] After undergoing multi-stage dust removal and purification, the clean acetylene gas is finally sent to the spray purification tower 4 for fine treatment such as desulfurization and impurity removal. The qualified acetylene gas is then transported to the next process for recycling. The entire set of equipment sequentially completes the entire process of gas flow stabilization, coarse dust removal, fine filtration, dust collection, and deep gas purification.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust-containing gas separation and recovery device for acetylene production using the calcium carbide method, comprising a base (1), a cyclone separator (2) fixedly connected above the base (1), and a spray purification tower (4) fixedly connected to one side of the cyclone separator (2), characterized in that: A multi-stage filtration assembly (3) is provided between the cyclone separator (2) and the spray purification tower (4). An air inlet buffer assembly (6) is fixedly connected to the air inlet end of the cyclone separator (2), and a discharge assembly (5) is fixedly connected to the discharge end of the cyclone separator (2). The multi-stage filtration assembly (3) includes a filter box (31), which is fixedly connected to the outlet end of the cyclone separator (2). A positioning seat (32) is fixedly connected inside the filter box (31). A primary filter screen (39), a medium-efficiency filter cloth layer (33), and a high-efficiency microporous filter plate (34) are installed inside the filter box (31) from top to bottom through the positioning seat (32). A sealing cover (35) is installed on the front side of the filter box (31). A rubber sealing ring (36) is fixedly connected to one side of the sealing cover (35). The filter box (31) and the sealing cover (35) are fixed by a limiting assembly (38).

2. The dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 1, characterized in that: The sealing cap (35) has symmetrical and fixedly connected positioning rods (37) on both ends of one side, and the filter box (31) has a positioning hole adapted to the positioning rods (37) on one side.

3. The dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 1, characterized in that: The limiting component (38) includes an electric telescopic rod (381), which is fixedly connected to both sides of the filter box (31), and a limiting frame (382) is fixedly connected to one end of the electric telescopic rod (381).

4. The dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 3, characterized in that: A handle (383) is fixedly connected to one side of the sealing cap (35). A rubber sleeve (384) is fixedly fitted onto the surface of the handle (383). Anti-slip protrusions (385) are fixedly connected around the surface of the rubber sleeve (384).

5. The dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 1, characterized in that: The discharge assembly (5) includes a discharge pipe (51), which is fixedly connected to the discharge pipe of the cyclone separator (2). A discharge motor (52) is fixedly connected below the discharge pipe (51). A spiral discharge roller (53) is fixedly connected to the output end of the discharge motor (52). The spiral discharge roller (53) and the discharge pipe (51) are rotatably connected by a bearing. A discharge pipe (54) is fixedly connected to one side of the discharge pipe (51). A sealing plate (55) is fixedly connected to the other end of the discharge pipe (54). A rubber sealing gasket (57) is fixedly connected below the sealing plate (55). A collection cylinder (56) is abutted below the rubber sealing gasket (57). A disassembly assembly (58) is provided below the collection cylinder (56).

6. The dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 5, characterized in that: A solenoid valve is fixedly connected in the middle of the feed pipe (54).

7. A dust-containing gas separation and recovery device for acetylene production via calcium carbide process according to claim 5, characterized in that: The disassembly and assembly assembly (58) includes an electric telescopic rod two (581), which is fixedly connected above the base (1), and a bearing plate (582) is fixedly connected above the electric telescopic rod two (581).

8. A dust-containing gas separation and recovery device for acetylene production via the calcium carbide method according to claim 7, characterized in that: A positioning ring (583) is fixedly connected above the bearing plate (582).

9. A dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 7, characterized in that: The two ends of the bearing plate (582) are slidably connected to a stabilizing slide rod (584). The bottom of the stabilizing slide rod (584) is fixedly connected to the base (1), and the top of the stabilizing slide rod (584) is fixedly connected to a limit block (585).

10. A dust-containing gas separation and recovery device in the calcium carbide-based acetylene production process according to claim 1, characterized in that: The air intake buffer assembly (6) includes a buffer box (61), which is fixedly connected to the air intake end of the cyclone separator (2). A flow equalization plate (62) is fixedly connected in the middle of the buffer box (61). Ventilation holes (63) are distributed in the middle of the flow equalization plate (62). An explosion-proof pressure relief valve (64) is fixedly connected to one end of the buffer box (61). A pressure sensor (65) is fixedly connected to one end of the buffer box (61). A mounting plate (66) is fixedly connected below the pressure sensor (65). Fixing screws (67) are inserted into both ends of the mounting plate (66). The fixing screws (67) are threadedly connected to the buffer box (61). A support plate (68) is fixedly connected to the bottom of the buffer box (61).

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