Low-nitrogen burner for boiler

Abstract

The application discloses a low-nitrogen combustor for a boiler and relates to the technical field of low-nitrogen combustion. The low-nitrogen combustor comprises a butt joint fixing mechanism and a combustion pipe assembly. The butt joint fixing mechanism comprises a butt joint clamping assembly and a clamping adjusting assembly. The butt joint clamping assembly comprises a slidingly arranged adjusting gland, a hollow support column and an elastic clamping sleeve. The clamping adjusting assembly comprises a rotationally arranged eccentric adjusting shaft. The combustion pipe assembly is arranged in the butt joint fixing mechanism. The combustion pipe assembly comprises a first combustion pipe and a second combustion pipe. The adjusting gland is used for pressing the elastic clamping sleeve, the elastic clamping sleeve is elastically deformed to realize butt joint fixing, the first combustion pipe is moved along the second combustion pipe, the position of a combustion nozzle is adjusted, the hollow support column is pushed by the rotation of the eccentric adjusting shaft, and the elastic clamping sleeve is elastically restored to the initial state and can be disassembled. The low-nitrogen combustor is flexibly installed and disassembled, the position of a combustion point is conveniently adjusted, and the combustion effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of low-NOx combustion technology, and in particular relates to a low-NOx burner for boilers. Background Technology

[0002] Low-NOx burners are a special type of burner designed to reduce nitrogen oxide emissions during combustion. Their use can significantly reduce nitrogen oxide emissions in industry and the power sector, playing a positive role in environmental protection. They typically employ combustion methods such as staged combustion, self-recirculating combustion, rich-lean combustion, and split-flame combustion to reduce nitrogen oxide formation, thus protecting the environment while achieving energy-saving effects.

[0003] Common low-NOx burners for boilers are fixedly connected to the boiler's outer wall, burning fuel gas to provide heat to the boiler's interior. However, the fixed position of the low-NOx burner avoids disassembly and replacement, easily leading to equipment waste. Furthermore, the fixed heating point of the low-NOx burner can cause uneven heating of different parts of the boiler's interior when applied to boilers of varying diameters. Therefore, we provide a low-NOx burner for boilers to solve the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a low-NOx burner for boilers, which solves the problems mentioned above by means of a specific structural design of the docking and fixing mechanism and the combustion tube assembly.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a low-NOx burner for boilers. The low-NOx burner is fixedly installed on a boiler body and includes a boiler body, a docking and fixing mechanism, and a combustion tube assembly. A combustion port is provided on the circumferential side of the boiler body, and a clamping and docking pipe is fixedly connected to the surface of the combustion port. The docking and fixing mechanism is installed on the circumferential side of the boiler body and includes a docking clamping assembly and a clamping adjustment assembly. The docking clamping assembly is disposed inside the clamping adjustment assembly. The docking clamping assembly includes a slidably disposed adjusting cover, a hollow support column, and an elastic sleeve. The clamping adjustment assembly includes a rotatably disposed eccentric adjusting shaft. The combustion tube assembly is disposed inside the docking and fixing mechanism and includes a first combustion tube and a second combustion tube. The first combustion tube is sleeved outside the second combustion tube, and a plurality of combustion nozzles are provided on the circumferential side of the second combustion tube. The first combustion tube and the second combustion tube are engaged with each other.

[0007] Place the docking clamping assembly inside the clamping docking tube, push the docking fixing mechanism to make the adjusting cover press against the elastic sleeve until the elastic sleeve and the clamping docking tube are tightly fitted to complete the docking fixing, and use the first combustion tube to move along the second combustion tube to adjust the position of the combustion nozzle; rotate the eccentric adjusting shaft to push the hollow support column, so that the force of the adjusting cover pressing the elastic sleeve disappears, and the elastic sleeve returns to its initial position and can be disassembled.

[0008] In a further embodiment of the present invention, the adjusting cap is fixedly connected to the periphery of the hollow support column, the elastic sleeve is sleeved on the periphery of the hollow support column, the upper surface of the elastic sleeve is in contact with the lower surface of the adjusting cap, and the interior of the elastic sleeve has an inclined sliding surface structure; a first support disc is fixedly connected to the periphery of the hollow support column, and a second support disc is slidably disposed at the end of the hollow support column away from the adjusting cap, the periphery of the second support disc is fixedly connected to the inner wall of the clamping and adjusting assembly; a return spring is fixedly connected between the first support disc and the second support disc, and the return spring is sleeved on the outside of the hollow support column.

[0009] Furthermore, the clamping adjustment assembly further includes a hollow adjustment column, which is formed by connecting a hollow conical tube, a first circular tube, and a second circular tube. The inner walls of the hollow conical tube and the first circular tube are in contact with the peripheral side of the hollow support column. The peripheral side of the hollow conical tube is in contact with the inclined sliding surface inside the elastic sleeve. The peripheral side of the first support disc is in contact with the inner wall of the second circular tube. The peripheral side of the second support disc is fixedly connected to the inner wall of the second circular tube.

[0010] A limiting outer shell is fixedly connected to the upper surface of the second circular tube, and an adjustment cavity is formed between the limiting outer shell and the first circular tube. An adjustment limiting block is slidably arranged inside the adjustment cavity, and the adjustment limiting block is located directly below the elastic sleeve. A clamping adjustment column is symmetrically slidably arranged on the upper surface of the second circular tube, and the clamping adjustment column penetrates the second circular tube. The upper end of the clamping adjustment column is located below the adjustment limiting block.

[0011] The second circular tube is fixedly connected to a support base on its circumferential side. The support base is provided with mounting holes on its circumferential side. Adjustment connecting columns are rotatably arranged inside both mounting holes. The eccentric adjustment shaft is fixedly connected between the two adjustment connecting columns, and both ends of the eccentric adjustment shaft are located at the eccentric position of the adjustment connecting columns.

[0012] In a further embodiment of the present invention, the peripheral side of the first combustion tube is fixedly connected to the inner wall of the hollow support column, and an adjusting rack is symmetrically fixedly connected to the inner wall of the first combustion tube; symmetrical mounting cavities are provided on the peripheral side of the first combustion tube, and mounting support plates are fixedly connected to the two inner side walls of each mounting cavity; a transmission gear is rotatably connected between the two mounting support plates via a rotating shaft, and the transmission gear meshes with the corresponding adjusting rack; a drive motor is fixedly mounted on one side of one of the mounting support plates, and the output shaft of the drive motor is fixedly connected to the transmission gear.

[0013] The present invention has the following beneficial effects:

[0014] 1. This invention sets up a docking and fixing mechanism, using an adjusting cover to press the elastic sleeve. The elastic sleeve deforms until it is completely in contact with the inner wall of the clamping docking pipe, thus completing the installation and fixing. Then, by rotating the eccentric adjusting shaft, the hollow support column is pushed, which reduces the force of the adjusting cover on the elastic sleeve. The elastic sleeve elastically recovers until it returns to its original shape. This realizes the connection and fixing between the low-NOx burner and the boiler body, which is convenient for installation and disassembly and flexible and convenient to use.

[0015] 2. This invention, by setting up a combustion tube assembly, utilizes a drive motor to rotate the corresponding transmission gear under the meshing action of the transmission gear and the corresponding adjusting rack, causing the transmission gear to travel along the corresponding adjusting rack, thereby driving the second combustion tube to slide along the first combustion tube, and thus adjusting the position of the combustion nozzle. This achieves position adjustment in boilers of different diameters, keeping the combustion point at the center of the boiler, ensuring sufficient combustion and meeting actual usage requirements.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a low-NOx burner for boilers.

[0019] Figure 2 for Figure 1 A schematic diagram of the transverse cross-section structure.

[0020] Figure 3 This is a schematic diagram of the boiler body in this invention.

[0021] Figure 4This is a schematic diagram of the docking and fixing mechanism in this invention.

[0022] Figure 5 for Figure 4 A schematic diagram of the longitudinal cross-section structure.

[0023] Figure 6 This is a longitudinal cross-sectional view of the docking clamping assembly in this invention.

[0024] Figure 7 This is a longitudinal cross-sectional view of the clamping and adjusting assembly in this invention.

[0025] Figure 8 This is a schematic diagram of the combustion tube assembly in this invention.

[0026] Figure 9 for Figure 8 A schematic diagram of the longitudinal cross-section structure.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1-Boiler body, 101-Clamping pipe, 2-Dating and fixing mechanism, 21-Dating clamping assembly, 211-Adjusting cover, 212-Hollow support column, 213-Elastic sleeve, 214-First support disc, 215-Second support disc, 216-Reset spring, 22-Clamping adjustment assembly, 221-Eccentric adjustment shaft, 222-Hollow adjustment column, 223-Limiting outer shell, 224-Adjusting limit block, 225-Clamping adjustment column, 226-Support seat, 227-Adjusting connecting column, 3-Combustion tube assembly, 301-First combustion tube, 302-Second combustion tube, 303-Combustion nozzle, 304-Adjusting rack, 305-Mounting support plate, 306-Transmission gear. Detailed Implementation

[0029] 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.

[0030] Please see Figure 1-9This invention relates to a low-NOx burner for boilers. The low-NOx burner is fixedly installed on a boiler body 1 and includes a docking and fixing mechanism 2 and a combustion tube assembly 3. A combustion port is provided on the circumferential side of the boiler body 1, connecting the low-NOx burner to the boiler body 1. A clamping and docking pipe 101 is fixedly connected to the surface of the combustion port. The docking and fixing mechanism 2 is installed on the circumferential side of the boiler body 1 and includes a docking clamping assembly 21 and a clamping adjustment assembly 22. The docking clamping assembly 21 is disposed inside the clamping adjustment assembly 22. The docking clamping assembly 21 includes a slidingly disposed adjusting pressure cap 211, a hollow support column 212, and an elastic sleeve 213. The elastic sleeve 213 has elastic deformation capability and undergoes elastic deformation when compressed by external force, thus adjusting the clamping force. Component 22 includes an eccentric adjustment shaft 221 that is rotatably set; the combustion tube assembly 3 is set inside the docking and fixing mechanism 2. The combustion tube assembly 3 includes a first combustion tube 301 and a second combustion tube 302. The first combustion tube 301 is sleeved on the outside of the second combustion tube 302. Several combustion nozzles 303 are provided on the circumferential side of the second combustion tube 302. The boiler body 1 is provided with an ignition device corresponding to the combustion nozzles 303. The combustion nozzles 303 spray gas and heat the inside of the boiler after ignition. The first combustion tube 301 and the second combustion tube 302 are engaged, so that the second combustion tube 302 can slide along the first combustion tube 301, thereby adjusting the position of the combustion nozzles 303 so that the combustion nozzles 303 are in the center of the boiler and the combustion effect is optimal.

[0031] Place the docking clamping assembly 21 inside the clamping docking tube 101, push the docking fixing mechanism 2 so that the adjusting cover 211 presses the elastic sleeve 213 in the opposite direction until the elastic sleeve 213 and the clamping docking tube 101 are tightly fitted to complete the docking fixing. Use the first combustion tube 301 to move along the second combustion tube 302 to adjust the position of the combustion nozzle 303. Rotate the eccentric adjusting shaft 221 to push the hollow support column 212 so that the force of the adjusting cover 211 pressing the elastic sleeve 213 disappears and the elastic sleeve 213 returns to its initial position and can be disassembled.

[0032] In this embodiment of the invention, the adjusting cap 211 is fixedly connected to the circumferential side of the hollow support column 212. The adjusting cap 211 moves synchronously with the hollow support column 212. The elastic sleeve 213 is sleeved on the circumferential side of the hollow support column 212. The upper surface of the elastic sleeve 213 is in contact with the lower surface of the adjusting cap 211. When the adjusting cap 211 moves in the direction of the elastic sleeve 213, it applies external pressure to the elastic sleeve 213, causing the elastic sleeve 213 to undergo elastic deformation. The interior of the elastic sleeve 213 has an inclined sliding surface structure. A first support disc 214 is fixedly connected to the periphery of the hollow support column 212. A second support disc 215 is slidably disposed at the end of the hollow support column 212 away from the adjusting cover 211. The periphery of the second support disc 215 is fixedly connected to the inner wall of the clamping and adjusting assembly 22. A return spring 216 is fixedly connected between the first support disc 214 and the second support disc 215. The return spring 216 is sleeved on the outside of the hollow support column 212. The hollow support column 212 slides along the second support disc 215, causing the return spring 216 to be compressed.

[0033] In this embodiment of the invention, the clamping adjustment assembly 22 further includes a hollow adjustment column 222, which is composed of a hollow conical tube, a first circular tube, and a second circular tube connected together. The peripheral side of the hollow conical tube is an inclined sliding surface structure. The inner walls of the hollow conical tube and the first circular tube are in contact with the peripheral side of the hollow support column 212. The peripheral side of the hollow conical tube is in contact with the inclined sliding surface inside the elastic sleeve 213. When the elastic sleeve 213 is under pressure, it slides along the inclined sliding surface and undergoes elastic deformation. The peripheral side of the first support disc 214 is in contact with the inner wall of the second circular tube. The peripheral side of the second support disc 215 is fixedly connected to the inner wall of the second circular tube, thereby forming a fixed end face.

[0034] In this embodiment of the invention, a limiting outer shell 223 is fixedly connected to the upper surface of the second circular tube. An adjustment cavity is formed between the limiting outer shell 223 and the first circular tube. An adjustment limiting block 224 is slidably disposed inside the adjustment cavity. The adjustment limiting block 224 is located directly below the elastic sleeve 213. A clamping adjustment column 225 is symmetrically slidably disposed on the upper surface of the second circular tube. The clamping adjustment column 225 penetrates the second circular tube. The length of the clamping adjustment column 225 extending out of the second circular tube is less than the length of the hollow support column 212 exceeding the length of the second circular tube. The upper end of the clamping adjustment column 225 is located below the adjustment limiting block 224. When the elastic sleeve 213 is under pressure, it presses down on the adjustment limiting block 224. At the same time, the adjustment limiting block 224 presses down to clamp the adjustment column 225, and the adjustment cavity restricts the movement of the adjustment limiting block 224.

[0035] In this embodiment of the invention, a support base 226 is fixedly connected to the circumferential side of the second circular tube. The circumferential side of the support base 226 is provided with mounting holes. Adjustment connecting columns 227 are rotatably arranged inside both mounting holes. An eccentric adjustment shaft 221 is fixedly connected between the two adjustment connecting columns 227, and both ends of the eccentric adjustment shaft 221 are located at the eccentric position of the adjustment connecting column 227. When the eccentric adjustment shaft 221 rotates, it first contacts and presses against the hollow support column 212, and then contacts and presses against the clamping adjustment column 225 after continuing to rotate.

[0036] In this embodiment of the invention, the peripheral side of the first combustion tube 301 is fixedly connected to the inner wall of the hollow support column 212, and an adjusting rack 304 is symmetrically fixedly connected to the inner wall of the first combustion tube 301; the peripheral side of the second combustion tube 302 is symmetrically provided with mounting cavities, and mounting support plates 305 are fixedly connected to the two inner side walls of the mounting cavities respectively. A transmission gear 306 is rotatably connected between the two mounting support plates 305 through a rotating shaft. The two transmission gears 306 always maintain synchronous rotation in opposite directions. The transmission gear 306 meshes with the corresponding adjusting rack 304. The transmission gear 306 rotates and moves along the adjusting rack 304, driving the second combustion tube 302 to slide along the first combustion tube 301; a drive motor is fixedly installed on one side of a mounting support plate 305, and the output shaft of the drive motor is fixedly connected to the transmission gear 306, driving the transmission gear 306 to rotate through the drive motor.

[0037] The working principle of this embodiment is as follows: Before heating the inside of the boiler body 1 using a low-NOx burner, the low-NOx burner is first fixedly installed at the combustion port of the boiler body 1. The specific installation process is as follows:

[0038] Insert the docking fixing mechanism 2 into the clamping docking pipe 101 and push the docking fixing mechanism 2 towards the boiler body 1. This causes the hollow support column 212 to move synchronously with the adjusting cover 211. The adjusting cover 211 contacts the boiler body 1 and, under the action of the boiler body 1, applies an external force to the elastic sleeve 213 in the opposite direction. This causes the elastic sleeve 213 to slide along the inclined sliding surface of the hollow adjusting column 222. After the elastic sleeve 213 contacts the adjusting limit block 224, it pushes the adjusting limit block 224 to move. The movement causes the clamping adjustment column 225 to slide along the second round tube until one side of the adjustment limit block 224 is in contact with one surface of the second round tube. The adjustment cover 211 continues to apply external force to the elastic sleeve 213, causing the elastic sleeve 213 to undergo elastic deformation and be compressed, so that the elastic sleeve 213 is precisely in contact with the inner wall of the clamping coupling tube 101. At the same time, the hollow support column 212 slides along the second support disc 215 and compresses the return spring 216, thereby completing the installation and fixing of the low-NOx burner.

[0039] After the low-NOx burner is installed and fixed, the two drive motors are started simultaneously to drive the corresponding transmission gears 306 to rotate, and the two transmission gears 306 are kept rotating synchronously in opposite directions. Under the meshing action of the transmission gears 306 and the corresponding adjusting racks 304, the transmission gears 306 move along the corresponding adjusting racks 304, thereby driving the second combustion tube 302 to slide along the first combustion tube 301, so that the combustion nozzles 303 move synchronously until the combustion nozzles 303 move to the center position of the boiler body 1, keeping the combustion effect in the optimal state.

[0040] When the low-NOx burner needs to be disassembled and replaced, the eccentric adjustment shaft 221 is rotated by rotating the adjusting connecting column 227. During the rotation of the eccentric adjustment shaft 221, it first contacts the hollow support column 212 and pushes the hollow support column 212, so that the adjusting cover 211 presses the boiler body 1. Under the reaction force, the adjusting cover 211 leaves the elastic jacket 213, and the external force on the elastic jacket 213 disappears. The eccentric adjustment shaft 221 continues to rotate and contacts the two adjusting connecting columns 227, so that the eccentric adjustment shaft 221 pushes the adjusting connecting column 227 to slide along the second circular tube and pushes the adjusting limit block 224 to move towards the elastic jacket 213. Then, the elastic jacket 213 slides along the inclined sliding surface of the hollow conical tube towards the boiler body 1. Under the action of elastic recovery, the elastic jacket 213 returns to its original shape and loses its restriction on the clamping connecting pipe 101, which is convenient for disassembly.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-nitrogen burner for a boiler, which is fixedly installed on a boiler body (1), characterized in that, include: The boiler body (1) has a combustion port on its circumferential side, and a clamping pipe (101) is fixedly connected to the surface of the combustion port. The docking and fixing mechanism (2) is installed on the periphery of the boiler body (1). The docking and fixing mechanism (2) includes a docking clamping assembly (21) and a clamping adjustment assembly (22). The docking clamping assembly (21) is located inside the clamping adjustment assembly (22). The docking clamping assembly (21) includes a sliding adjustment cover (211), a hollow support column (212), and an elastic sleeve (213), and the clamping adjustment assembly (22) includes a rotatably arranged eccentric adjustment shaft (221). Combustion tube assembly (3) is disposed inside docking and fixing mechanism (2). Combustion tube assembly (3) includes a first combustion tube (301) and a second combustion tube (302). The first combustion tube (301) is sleeved on the outside of the second combustion tube (302). The second combustion tube (302) has a plurality of combustion nozzles (303) on its peripheral side. The first combustion tube (301) and the second combustion tube (302) are engaged with each other. Place the docking clamping assembly (21) inside the clamping docking tube (101), push the docking fixing mechanism (2) so that the adjusting cap (211) presses the elastic sleeve (213) in the opposite direction until the elastic sleeve (213) and the clamping docking tube (101) are tightly fitted to complete the docking fixing. Use the first combustion tube (301) to move along the second combustion tube (302) to adjust the position of the combustion nozzle (303); rotate the eccentric adjusting shaft (221) to push the hollow support column (212) so that the force of the adjusting cap (211) pressing the elastic sleeve (213) disappears and the elastic sleeve (213) returns to its initial position and can be disassembled; The adjusting cover (211) is fixedly connected to the periphery of the hollow support column (212), and the elastic sleeve (213) is sleeved on the periphery of the hollow support column (212). The upper surface of the elastic sleeve (213) is in contact with the lower surface of the adjusting cover (211), and the interior of the elastic sleeve (213) is an inclined sliding surface structure. The hollow support column (212) is fixedly connected to the periphery of a first support disc (214), and a second support disc (215) is slidably provided at the end of the hollow support column (212) away from the adjusting cover (211). The periphery of the second support disc (215) is fixedly connected to the inner wall of the clamping and adjusting assembly (22). A return spring (216) is fixedly connected between the first support disc (214) and the second support disc (215), and the return spring (216) is sleeved on the outside of the hollow support column (212); The clamping adjustment assembly (22) further includes a hollow adjustment column (222), which is composed of a hollow conical tube, a first circular tube and a second circular tube connected together. A limiting shell (223) is fixedly connected to the upper surface of the second round tube. An adjustment cavity is formed between the limiting shell (223) and the first round tube. An adjustment limiting block (224) is slidably arranged inside the adjustment cavity. The adjustment limiting block (224) is located directly below the elastic sleeve (213).

2. A low-NOx burner for boilers according to claim 1, characterized in that, The hollow conical tube and the inner wall of the first circular tube are both in contact with the circumferential side of the hollow support column (212). The circumferential side of the hollow conical tube is in contact with the inclined sliding surface inside the elastic sleeve (213). The circumferential side of the first support disc (214) is in contact with the inner wall of the second circular tube. The circumferential side of the second support disc (215) is fixedly connected to the inner wall of the second circular tube.

3. A low-NOx burner for a boiler according to claim 1, characterized in that, A clamping adjustment post (225) is symmetrically slidably arranged on the upper surface of the second round tube. The clamping adjustment post (225) passes through the second round tube, and the upper end of the clamping adjustment post (225) is located below the adjustment limit block (224).

4. The low-NOx burner for a boiler according to claim 3, wherein The second circular tube is fixedly connected to a support base (226) on its circumferential side. The support base (226) is provided with mounting holes on its circumferential side. Adjustment connecting columns (227) are rotatably arranged inside the two mounting holes. The eccentric adjustment shaft (221) is fixedly connected between the two adjustment connecting columns (227), and both ends of the eccentric adjustment shaft (221) are located at the eccentric position of the adjustment connecting column (227).

5. A low-NOx burner for a boiler according to claim 4, characterized in that The peripheral side of the first combustion tube (301) is fixedly connected to the inner wall of the hollow support column (212), and the inner wall of the first combustion tube (301) is symmetrically fixedly connected with an adjusting rack (304).

6. A low-NOx burner for a boiler according to claim 5, characterized in that The second combustion tube (302) has symmetrically provided mounting cavities on its circumferential side. Mounting support plates (305) are fixedly connected to the two inner side walls of the mounting cavities. A transmission gear (306) is rotatably connected between the two mounting support plates (305) through a rotating shaft. The transmission gear (306) meshes with the corresponding adjusting rack (304). A drive motor is fixedly mounted on one side of the mounting support plate (305), and the output shaft of the drive motor is fixedly connected to the transmission gear (306).

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