Drying box for catalyst experiment

Abstract

The utility model discloses a drying box for a catalyst experiment. The drying box comprises a processing box and a box door hinged to the front side. A drying cavity and an auxiliary cavity at the bottom are formed in the treatment box and are separated by a separation plate. An adjusting base plate is arranged in the drying cavity, and the position of the base plate is adjusted through a lifting adjusting assembly. The assembly comprises a guide column, an adjusting screw and a driving shaft, the guide column is slidably connected with the adjusting base plate, the adjusting screw is screwed with the base plate, the driving shaft is in power connection with the adjusting screw, and lifting adjustment of the base plate is achieved. In addition, a retractable base plate, a connecting rod and a positioning plate are further arranged in the drying cavity. The box door is provided with an air supply outlet, and the back is provided with an exhaust outlet, thereby enhancing air fluidity. According to the design, the catalyst treatment capacity is increased, the distance between the base plates can be flexibly adjusted according to needs, and the drying efficiency and the equipment compactness are improved. And meanwhile, the sealing performance and the operation convenience of the equipment are improved, and the uniform drying effect of the catalyst is ensured.

Description

Technical Field

[0001] This utility model relates to the field of experimental drying technology, specifically a drying box for catalyst experiments. Background Technology

[0002] The preparation process of denitration catalysts is a complex one, and each step has a significant impact on the performance of the final product. The main process flow is as follows:

[0003] Powder conveying and silo weighing: Active components (such as vanadium titanate, cerium tungstate, etc.) and carrier materials (such as titanium dioxide) are conveyed to the silo and weighed accurately.

[0004] Intensive mixing: The weighed raw materials are placed into a mixer to ensure uniform mixing of all components. This is crucial for ensuring the activity and uniformity of the catalyst.

[0005] Mixing the slurry: The powder is mixed with water and other additives to form a slurry. The consistency and flowability of the slurry directly affect the subsequent molding process.

[0006] Filtration: Large particles and impurities in the slurry are removed by filtration equipment to ensure that the quality of the slurry meets production requirements.

[0007] Extrusion: The filtered slurry is fed into an extruder and extruded through a die into a honeycomb or other shapes of wet preform. Extrusion speed, pressure, and die design all affect the size and shape of the product.

[0008] Honeycomb wet preform: The extruded wet preform has a honeycomb structure, which can provide a larger surface area and enhance the activity of the catalyst.

[0009] Drying: The wet blanks are placed in a drying chamber for at least two drying treatments to prevent cracking during subsequent high-temperature firing and to ensure the strength and stability of the blanks.

[0010] High-temperature calcination: The dried green body is sent into a high-temperature furnace for calcination. The calcination temperature is usually above 800℃. During this process, the active components in the raw materials will form a stable catalytic active phase, and the support material will also sinter into a solid structure. After high-temperature calcination, the structure and performance of the denitrification catalyst are solidified, becoming a usable finished product.

[0011] Following customer requirements, the calcined catalyst blocks are then cut into modules of specified sizes. The ends of the cut modules are hardened to enhance their mechanical strength and prevent breakage during use. The cut and processed modules can then be assembled into standard modules according to design requirements for installation in the denitrification system.

[0012] These steps collectively constitute the production process of denitrification catalysts, and each step directly affects the catalyst's performance and efficiency. In-depth research into catalyst production technology and molding processes can lead to the development of catalysts that can withstand the test of practical engineering, which is a crucial aspect of the future development of SCR technology.

[0013] In the drying process of honeycomb wet catalyst blanks, traditional experimental drying ovens have limited capacity, resulting in a restricted amount of denitrification catalyst prepared in the laboratory. This makes it difficult to meet the dosage requirements of denitrification catalyst performance and energy efficiency experiments. Furthermore, the internal supports of traditional experimental drying ovens are mostly detachable structures. Although the spacing between the support layers can be adjusted according to the amount and size of the material being processed, this adjustment method is inconvenient and cannot meet the drying needs of various types and sizes of catalysts. Utility Model Content

[0014] To address the aforementioned shortcomings of existing technologies, the purpose of this invention is to provide a drying oven for catalyst experiments, which effectively increases the catalyst processing capacity, provides a flexible adjustable pad spacing function, improves the compactness of the equipment, and significantly enhances drying efficiency. Simultaneously, by improving operational convenience and ensuring the equipment's airtightness, it guarantees efficient catalyst drying and safety during the experimental process.

[0015] The technical solution adopted by this utility model to achieve the above-mentioned objective is: a drying box for catalyst experiments, including a processing box and a door hinged to the front side of the processing box. The processing box is provided with a drying chamber and an auxiliary chamber arranged at the bottom of the drying chamber. An isolation plate is fixed between the drying chamber and the auxiliary chamber. An adjustment pad is arranged in the drying chamber.

[0016] It also includes a lifting and adjusting assembly, which includes a guide post, an adjusting screw, and a drive shaft. The guide post is fixedly installed at the corner of the drying chamber and is slidably inserted into the adjusting pad. The adjusting screw is rotatably installed in the drying chamber and is screwed into the adjusting pad. The drive shaft is rotatably installed in the auxiliary chamber and is poweredly connected to the adjusting screw.

[0017] It also includes a take-up pad, a connecting rod, a hinge seat, and a positioning plate. The top wall of the drying chamber, the upper surface of the isolation plate, and the upper and lower surfaces of the adjusting pad are all fixedly connected to the hinge seat and the positioning plate. The take-up pad is hinged to the connecting rod, and the positioning plate is fixedly combined with the connecting rod by a bolt assembly.

[0018] Ventilation holes are provided on the isolation plate, adjustment plate, and storage plate. An air inlet is provided on the door, and an exhaust vent is provided on the back of the processing box, which is horizontally opposite to the top of the drying chamber.

[0019] Based on the above technical solutions, in order to facilitate the overall movement of the processing box, the opening and closing of the box door, and the intuitive understanding of the drying status of the catalyst by the staff, the following technical solutions are provided.

[0020] The bottom corners of the processing box are equipped with universal casters, the outer wall of the box door is equipped with a handle, the box door is equipped with an observation window frame, and a light-transmitting plate is fixedly installed on the observation window frame.

[0021] Based on the above technical solutions, in order to ensure the sealing effect of the processing box and prevent dust from entering from the seams or internal hot air leakage from affecting the coarse particle quality of the catalyst when the box door is closed, the following technical solutions are provided.

[0022] The inner walls of the drying chamber and the auxiliary chamber are respectively fixed with an upper pad and a lower pad, and the inner wall of the door is fixed with a sealing gasket and a sealing strip. The sealing gasket and the upper pad are sealed together, and the sealing strip and the lower pad are sealed together.

[0023] Based on the above technical solutions, in order to ensure that natural air from the external environment can be delivered to the auxiliary chamber through the air outlet on the box door, and to discharge the catalyst with moisture after effective drying through the exhaust outlet, and to prevent dust from entering the processing box, the following technical solutions are provided.

[0024] The door has an air supply cavity that communicates with the air supply outlet. The inner wall of the door has a communication opening that communicates with the air supply cavity. The communication opening is located inside the sealing strip and is opposite to the auxiliary cavity. The air supply outlet and the exhaust outlet are respectively equipped with dustproof mesh cover A and dustproof mesh cover B.

[0025] Based on the above technical solutions, in order to ensure that air from the external environment is extracted and heated to form hot air, so as to achieve efficient drying of the catalyst in the drying chamber, the following technical solutions are provided.

[0026] The air supply cavity is equipped with multiple sets of evenly distributed electric heating wires, which are arranged between the air supply port and the connecting port; a mounting plate is installed at the connecting port, and multiple sets of evenly distributed fans are mounted on the mounting plate.

[0027] Based on the above technical solutions, in order to ensure that the drive shaft can drive the adjusting screw to operate stably, and to ensure that the adjusting screw and guide shaft can drive the adjusting pad to rise and fall stably, the following technical solutions are provided.

[0028] The adjusting screw includes two sets arranged side by side. The bottom ends of both sets of adjusting screws are fixedly connected to a transmission bevel gear A arranged in the auxiliary cavity. The lifting adjustment assembly also includes a transmission shaft rotatably installed in the auxiliary cavity. Two sets of driving bevel gears A are fixedly connected to the transmission shaft. The two sets of driving bevel gears A are respectively meshed with the two sets of transmission bevel gears A. A driving bevel gear B and a transmission bevel gear B are respectively fixedly connected to the driving shaft and the transmission shaft. The driving bevel gear B and the transmission bevel gear B are kept meshed. A handwheel is fixedly connected to the outer end of the driving shaft.

[0029] The beneficial effects of this utility model are:

[0030] 1. Increased throughput: The structural design of the drying chamber allows for uniform distribution of the catalyst on the receiving and adjusting plates, and the separating plates, resulting in more efficient drying. The adjusting device on the plates can be flexibly adjusted according to the amount and size of the catalyst being processed, making the placement of the catalyst more scientific and reasonable, and avoiding uneven drying caused by overly dense or loose stacking. This adjustment function enables the processing of catalysts of different sizes or shapes, expanding the applicability of the drying chamber and improving work efficiency.

[0031] 2. Flexible adjustment of the pad spacing: During the drying process, adjusting the pad spacing helps ensure that the catalyst is heated evenly within the drying chamber, thus achieving a more efficient drying effect. Through the lifting and adjusting components, operators can precisely control the height of the adjusting pads, maintaining a reasonable distance between them and the top wall and partition plates of the drying chamber. This optimizes the hot air flow path, further improving the uniformity and efficiency of catalyst drying. This flexibility and adjustability makes the equipment more adaptable, meeting different experimental needs and further enhancing its versatility and economy.

[0032] 3. Improve the compactness of the equipment. By rationally arranging the layout of each part of the structure, all functional components (such as lifting and adjusting components, retractable pads, ventilation holes, etc.) can be compactly installed inside the processing box and the box door, thereby saving space. In particular, the flexible design of the adjusting pads and retractable pads allows the equipment to be adjusted appropriately according to needs, avoiding the waste of redundant space. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the box door in the open position of this utility model;

[0036] Figure 4This is a structural diagram of the cabinet door in its cut-out and disassembled state.

[0037] Figure 5 This is a schematic diagram of the load cell in its cross-sectional state;

[0038] Figure 6 A schematic diagram of the structure of the matching combination of the adjusting pad and the lifting adjustment component;

[0039] Figure 7 A schematic diagram of the assembly of the retractable pad onto the adjusting pad;

[0040] Figure 8 A detailed schematic diagram showing the assembly of the retractable pad onto the adjusting pad.

[0041] In the diagram: 1. Processing box; 101. Drying chamber; 102. Auxiliary chamber; 103. Isolation plate; 104. Adjusting pad; 105. Retractable pad; 106. Connecting rod; 107. Hinge seat; 108. Positioning plate; 109. Bolt assembly; 110. Ventilation hole; 111. Exhaust vent; 112. Universal casters; 113. Upper pad strip; 114. Lower pad strip; 115. Dustproof mesh cover B; 2. Box door; 201. Air outlet; 202. Handle; 203. Observation window. Frame, 204 light-transmitting plate, 205 sealing gasket, 206 sealing strip, 207 air supply cavity, 208 connecting port, 209 dustproof mesh cover A, 210 electric heating wire, 211 mounting plate, 212 fan, 31 guide column, 32 adjusting screw, 321 transmission bevel gear A, 33 drive shaft, 331 drive bevel gear B, 332 handwheel, 34 drive shaft, 341 drive bevel gear A, 342 transmission bevel gear B. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Please see Figure 1-8 A drying oven for catalyst experiments includes a processing box 1 and a door 2 hinged to the front of the processing box 1. The processing box 1 is provided with a drying chamber 101 and an auxiliary chamber 102 arranged at the bottom of the drying chamber 101. A partition plate 103 is fixed between the drying chamber 101 and the auxiliary chamber 102. An adjusting pad 104 is arranged in the drying chamber 101.

[0044] It also includes a lifting and adjusting assembly, which includes a guide post 31, an adjusting screw 32, and a drive shaft 33. The guide post 31 is fixedly installed at the corner of the drying chamber 101 and is slidably inserted into the adjusting pad 104. The adjusting screw 32 is rotatably installed in the drying chamber 101 and is screwed into the adjusting pad 104. The drive shaft 33 is rotatably installed in the auxiliary chamber 102 and is poweredly connected to the adjusting screw 32.

[0045] It also includes a take-up pad 105, a connecting rod 106, a hinge seat 107, and a positioning plate 108. The top wall of the drying chamber 101, the upper surface of the isolation plate 103, and the upper and lower surfaces of the adjusting pad 104 are all fixedly connected to the hinge seat 107 and the positioning plate 108. The take-up pad 105 and the connecting rod 106 are hinged together, and the positioning plate 108 and the connecting rod 106 are fixedly combined by bolt assembly 109.

[0046] Ventilation holes 110 are provided on the isolation plate 103, the adjusting plate 104, and the storage plate 105. An air outlet 201 is provided on the door 2. An exhaust outlet 111 is provided on the back of the processing box 1, which is horizontally opposite to the top of the drying chamber 101.

[0047] Hinges 107 and positioning plates 108 are fixedly connected to the top wall of the drying chamber 101, the upper surface of the partition plate 103, and the upper and lower surfaces of the adjusting pad 104. The hinges 107 and positioning plates 108 are arranged on the left and right sides and the front and rear ends of the corresponding take-up pad 105. One end of each connecting rod 106 is hinged to the hinge 107 at the corresponding position, while the other end of the connecting rod 106 is hinged to the corresponding take-up pad 105. When the connecting rod 106 is flipped to the horizontal state, the matching take-up pad 105 can be kept horizontally attached to the top wall of the drying chamber 101, the partition plate 103, and the adjusting pad 104. The connecting rods 106 are fixed to the corresponding positioning plates 108 by bolt assemblies 109 so that the take-up pad 105 and the connecting rods 106 are arranged in a horizontal position.

[0048] By adjusting the tilt angle of each connecting rod 106 on the take-up and put-down pad 105, and by positioning the tilt posture of the connecting rod 106 with the bolt assembly 109 and the positioning plate 108, the distance between the take-up and put-down pad 105 and the top wall of the drying chamber 101, the isolation plate 103, and the adjusting pad 104 can be adjusted.

[0049] The height of the adjusting pad 104 can be adjusted by the lifting adjustment component to achieve reasonable adjustment of the distance between the adjusting pad 104 and the take-up pad 105 mounted on it and the top wall of the drying chamber 101 and the upper surface of the isolation plate 103. This allows the extruded honeycomb wet catalyst to be evenly distributed on the take-up pad 105, the adjusting pad 104, and the isolation plate 103, and the honeycomb wet catalyst to be evenly and effectively dried by the hot air input into the drying chamber 101.

[0050] External natural wind can be input into the processing box 1 through the air outlet 201 on the box door 2, and dry the honeycomb wet catalyst through the ventilation holes 110 on each layer of the structure from top to bottom, and finally be discharged through the exhaust port 111 on the back of the processing box 1.

[0051] In addition, when each of the storage and placement pads 105 is in a folded posture and the height of the adjustment pad 104 is adjusted, the catalyst to be dried can be evenly placed on the adjustment pad 104 and the isolation plate 103, which can meet the drying needs of other types or large-sized catalysts.

[0052] To facilitate the overall movement of the processing chamber 1, the opening and closing of the chamber door 2, and to allow staff to have a direct view of the catalyst drying status, the following technical solution is provided.

[0053] The bottom corner of the processing box 1 is equipped with universal casters 112, the outer wall of the box door 2 is equipped with a handle 202, the box door 2 is equipped with an observation window frame 203, and a light-transmitting plate 204 is fixedly installed on the observation window frame 203.

[0054] The universal casters 112 facilitate the transfer of the processing box 1. Each universal caster 112 is equipped with a brake. Locking the brake ensures the stable placement of the processing box 1. The handle 202 facilitates the control of the opening and closing of the box door 2. The handle 202 is equipped with a locking mechanism. By turning the handle 202, the locking or unlocking of the box door 2 and the processing box 1 can be controlled. The observation window frame 203 provides a direct view of the catalyst drying status. The addition of a light-transmitting plate 204 ensures the sealing effect of the processing box 1.

[0055] When the door 2 is closed, in order to ensure the sealing effect of the processing box 1 and prevent dust from entering from the seams or internal hot air leakage from affecting the coarse particle quality of the catalyst, the following technical solution is provided.

[0056] The inner walls of the drying chamber 101 and the auxiliary chamber 102 are respectively fixed with an upper gasket 113 and a lower gasket 114. The inner wall of the door 2 is fixed with a sealing gasket 205 and a sealing strip 206. The sealing gasket 205 and the upper gasket 113 are sealed together, and the sealing strip 206 and the lower gasket 114 are sealed together.

[0057] The upper gasket 113 and the lower gasket 114 are respectively located at the openings of the drying chamber 101 and the auxiliary chamber 102. When the door 2 is closed, the sealing gasket 205 can be sealed and adhered to the upper gasket 113, and the sealing strip 206 can be sealed and adhered to the lower gasket 114 to ensure the sealing effect of the treatment box 1.

[0058] To ensure that natural air from the external environment can be delivered to the auxiliary chamber 102 through the air outlet 201 on the chamber door 2, and to discharge the catalyst with moisture after effective drying through the exhaust outlet 111, while preventing dust from entering the processing chamber 1, the following technical solution is provided.

[0059] The door 2 has an air supply cavity 207 that communicates with the air supply port 201. The inner wall of the door 2 has a connecting port 208 that communicates with the air supply cavity 207. The connecting port 208 is arranged inside the sealing strip 206 and is opposite to the auxiliary cavity 102. The air supply port 201 and the exhaust port 111 are respectively equipped with dustproof mesh cover A209 and dustproof mesh cover B115.

[0060] External air can be input into the auxiliary cavity 102 through the air supply port 201, the air supply cavity 207, and the connecting port 208, and then transported upward layer by layer through the ventilation holes 110 to fully dry and dehumidify each layer of catalyst, and finally carry the moisture out through the exhaust port 111. The dust screen A209 and dust screen B115 can effectively block dust from the external environment.

[0061] To ensure that air from the external environment is extracted and heated to form hot air, thereby achieving efficient drying of the catalyst in the drying chamber 101, the following technical solution is provided.

[0062] The air supply cavity 207 is equipped with multiple sets of evenly distributed electric heating wires 210, which are arranged between the air supply port 201 and the connecting port 208. A mounting plate 211 is installed at the connecting port 208, and multiple sets of evenly distributed fans 212 are installed on the mounting plate 211.

[0063] The electric heating wire 210 can effectively heat the external air in the air supply cavity 207, while the mounting plate 211 can ensure that the fan 212 is stably installed at the connection port 208. The fan 212 can effectively draw the external air into the air supply cavity 207, and after being heated by the electric heating wire 210, it is finally delivered to the auxiliary cavity 102 at the bottom of the drying cavity 101 by the fan 212.

[0064] To ensure that the drive shaft 33 can drive the adjusting screw 32 to operate stably, and to ensure that the adjusting screw 32 and the guide shaft can drive the adjusting pad 104 to rise and fall stably, the following technical solution is provided.

[0065] The adjusting screw 32 includes two sets arranged side by side. The bottom ends of the two sets of adjusting screws 32 are fixedly connected to the transmission bevel gears A321 arranged in the auxiliary cavity 102. The lifting adjustment assembly also includes a transmission shaft 34 rotatably installed in the auxiliary cavity 102. Two sets of driving bevel gears A341 are fixedly connected to the transmission shaft 34. The two sets of driving bevel gears A341 are respectively meshed with the two sets of transmission bevel gears A321. The driving shaft 33 and the transmission shaft 34 are respectively fixedly connected to the driving bevel gears B331 and B342. The driving bevel gears B331 and B342 are kept meshed. The outer end of the driving shaft 33 is fixedly connected to the handwheel 332.

[0066] The guide column 31 is provided in four sets, which are slidably inserted into each corner of the adjusting pad 104. The two sets of adjusting screws 32 are respectively screwed to the left and right sides of the adjusting pad 104. When the operating handwheel 332 drives the drive shaft 33 to rotate, the drive bevel gear B331 and the transmission bevel gear B342 can drive the transmission shaft 34 to rotate stably. Then, the combination of the drive bevel gear A341 and the transmission bevel gear A321 drives the two sets of adjusting screws 32 to rotate stably, thereby driving the adjusting pad 104 to be raised and lowered in the drying chamber 101.

[0067] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A drying oven for catalyst experiments, characterized in that: The equipment includes a processing box (1) and a door (2) hinged to the front of the processing box (1). The processing box (1) is provided with a drying chamber (101) and an auxiliary chamber (102) arranged at the bottom of the drying chamber (101). A partition plate (103) is fixed between the drying chamber (101) and the auxiliary chamber (102). An adjusting pad (104) is arranged in the drying chamber (101). It also includes a lifting adjustment assembly, which includes a guide post (31), an adjusting screw (32), and a drive shaft (33). The guide post (31) is fixedly installed at the corner of the drying chamber (101) and is slidably inserted into the adjusting pad (104). The adjusting screw (32) is rotatably installed in the drying chamber (101) and is screwed into the adjusting pad (104). The drive shaft (33) is rotatably installed in the auxiliary chamber (102) and is poweredly connected to the adjusting screw (32). It also includes a take-up pad (105), a connecting rod (106), a hinge seat (107), and a positioning plate (108). The top wall of the drying chamber (101), the upper surface of the isolation plate (103), and the upper and lower surfaces of the adjusting pad (104) are all fixedly connected to the hinge seat (107) and the positioning plate (108). The take-up pad (105) is hinged to the connecting rod (106), and the positioning plate (108) is fixedly combined with the connecting rod (106) by a bolt assembly (109). Ventilation holes (110) are provided on the isolation plate (103), the adjustment pad (104), and the storage pad (105). An air outlet (201) is provided on the box door (2). An exhaust outlet (111) is provided on the back of the processing box (1) with the top of the drying chamber (101) facing each other horizontally.

2. The drying oven for catalyst experiments according to claim 1, characterized in that: The processing box (1) is equipped with universal casters (112) at the bottom corners, the box door (2) is equipped with a handle (202) on the outer wall, the box door (2) is equipped with an observation window frame (203), and a light-transmitting plate (204) is fixedly installed on the observation window frame (203).

3. The drying oven for catalyst experiments according to claim 1, characterized in that: The inner walls of the drying chamber (101) and the auxiliary chamber (102) are respectively fixed with an upper pad strip (113) and a lower pad strip (114). The inner wall of the door (2) is fixed with a sealing gasket (205) and a sealing strip (206). The sealing gasket (205) and the upper pad strip (113) are sealed together. The sealing strip (206) and the lower pad strip (114) are sealed together.

4. A drying oven for catalyst experiments according to claim 3, characterized in that: The door (2) has an air supply cavity (207) that communicates with the air supply port (201). The inner wall of the door (2) has a communication port (208) that communicates with the air supply cavity (207). The communication port (208) is located inside the sealing strip (206) and is opposite to the auxiliary cavity (102). The air supply port (201) and the exhaust port (111) are respectively equipped with dustproof mesh cover A (209) and dustproof mesh cover B (115).

5. A drying oven for catalyst experiments according to claim 4, characterized in that: The air supply cavity (207) is equipped with a plurality of uniformly distributed electric heating wires (210), which are arranged between the air supply port (201) and the connecting port (208); a mounting plate (211) is installed at the connecting port (208), and a plurality of uniformly distributed fans (212) are installed on the mounting plate (211).

6. A drying oven for catalyst experiments according to claim 1, characterized in that: The adjusting screw (32) includes two sets arranged side by side. The bottom ends of the two sets of adjusting screws (32) are fixedly connected to the transmission bevel gears A (321) arranged in the auxiliary cavity (102). The lifting adjustment assembly also includes a transmission shaft (34) rotatably installed in the auxiliary cavity (102). Two sets of driving bevel gears A (341) are fixedly connected to the transmission shaft (34). The two sets of driving bevel gears A (341) are respectively meshed with the two sets of transmission bevel gears A (321). The driving shaft (33) and the transmission shaft (34) are respectively fixedly connected to the driving bevel gear B (331) and the transmission bevel gear B (342). The driving bevel gear B (331) and the transmission bevel gear B (342) are kept meshed. A handwheel (332) is fixedly connected to the outer end of the driving shaft (33).

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