A low-nitrogen combustion boiler unit

Abstract

The present invention provides a low-nitrogen combustion boiler unit, which relates to the technical field of low-nitrogen combustion, and includes a lifting component, a moving component and a locking component; a burner and a boiler are fixedly installed on the top surface of the installation platform; the lifting component includes a lifting fixed pipe and a lifting rod, the bottom of the lifting fixed pipe is fixedly connected to the top surface of the bottom plate, the lifting rod is an electric drive lifting structure telescopic rod, and the top of the push rod of the lifting rod is fixedly connected to the shaft inside the lifting fixed pipe through a connecting rod; the moving component is installed inside the housing, and the moving component is composed of a telescopic rod and a wedge-shaped plate. When the clamping shaft drives the driven rubber wheel to rotate, the coaxial drive bevel gear rotates, drives the driven bevel gear to rotate through meshing, and then drives the coupling shaft to rotate. The transmission ratio is realized through the drive bevel gear and the driven bevel gear, making the rotation angle of the baffle easier to accurately control, and solving the problem of difficult to accurately control the flow rate of fuel delivery.

Description

Technical Field

[0001] The present invention relates to the technical field of loading machines, and particularly relates to a low-nitrogen combustion boiler unit. Background Art

[0002] Low-nitrogen combustion is a part of the combustion reaction for the generation of nitrogen oxides: the nitrogen oxides generated by combustion are mainly NO and NO2, collectively referred to as NO X , during the combustion process of the fuel, NO in the atmosphere X will form nitric acid rain after dissolving in water, and acid rain will cause extensive harm to the environment. Therefore, a low-nitrogen combustion boiler unit is proposed to reduce the harm of acid rain.

[0003] Existing low-nitrogen combustion boiler units achieve low-nitrogen combustion through methods such as in-furnace denitrification, tail-end denitrification, and staged combustion. During the staged combustion process, low-oxygen combustion needs to be carried out in the main combustion zone. However, it is difficult for the burner to accurately control the flow rate of fuel delivery, and when the delivery rate needs to be changed, it is difficult for coaxial transmission to achieve two transmission ratios; after the combustion unit is installed beside the boiler, the use of traditional bolt connection is relatively cumbersome and not convenient for disassembly, installation, and maintenance. Summary of the Invention

[0004] In view of this, the present invention provides a low-nitrogen combustion boiler unit, which has a lifting component and a moving component, and two transmission methods of coaxial connection or transmission connection can be achieved between the drive shaft of the drive motor and the rotating shaft of the baffle, so as to facilitate precise control of the rotation angle of the baffle and the fuel flow rate.

[0005] The present invention provides a low-nitrogen combustion boiler unit, which specifically includes an installation platform, a drive component, a housing, a lifting component, a moving component, and a locking component; a burner and a boiler are fixedly installed on the top surface of the installation platform; a delivery pipe is arranged on the burner, and the end of the delivery pipe is fixedly communicated with the inside of the boiler; the drive component is installed on the burner, and the drive component includes a drive motor, a mounting plate, a bottom plate, and a coupling; the housing is installed at the bottom of the drive motor; the lifting component includes a lifting fixed pipe and a lifting rod, the bottom of the lifting fixed pipe is fixedly connected to the top surface of the bottom plate, the lifting rod is an electrically driven lifting structure telescopic rod, and the top of the push rod of the lifting rod is fixedly connected to the shaft inside the lifting fixed pipe through a connecting rod; the moving component is installed inside the housing, and the moving component is composed of a telescopic rod and a wedge plate; the locking component is fixedly connected to the periphery of the bottom of the burner and the top surface of the installation platform, and the locking component includes a U-shaped rod, a fixing plate, a plug rod, a locking plate, and a rotating locking plate.

[0006] Optionally, a body is further arranged on the burner, the body is fixedly connected to the middle section of the burner, and the right end is fixedly connected to the delivery pipe. The upper part inside the boiler is a reburning zone.

[0007] Optionally, a rotating shaft is clamped inside the bottom of the drive shaft of the drive motor. The lower part of the rotating shaft is clamped to a clamping shaft. The mounting plate is fixedly connected to the bottom of the housing of the drive motor. The bottom plate is fixedly connected to the bottom of the mounting plate. A dial is arranged on the top surface of the bottom plate. Staples are fixedly clamped outside the dial on the top surface of the bottom plate. The center of the inside of the dial is penetrated by a lifting fixed tube. The top end of the connecting shaft is fixedly clamped to the bottom end of the shaft inside the lifting fixed tube, and a baffle is fixedly connected to the connecting shaft.

[0008] Optionally, a fixed tube and a clamping shaft are installed inside the housing. The fixed tube is fixedly connected to the inner top surface of the housing. A slideway is arranged on the left side of the fixed tube. A wedge-shaped plate is slidably clamped inside the slideway. The clamping shaft is clamped to the bottom of the rotating shaft through a clamping pin. The bottom end of the clamping shaft is a conical rubber wheel. The outside of the clamping shaft is clamped to the right end of the wedge-shaped plate, and the clamping shaft is movably clamped inside the fixed tube.

[0009] Optionally, a driven bevel gear is arranged at the top end of the shaft inside the lifting fixed tube. A lifting tube is slidably clamped inside the lifting fixed tube. A connecting rod penetrates through the through groove at the left end of the lifting tube.

[0010] Optionally, the fixed end of the telescopic rod is fixedly connected to the mounting plate. A driven rubber wheel is arranged at the end of the round rod at the free end. A connecting rod is arranged above the round rod at the free end of the telescopic rod. The end of the connecting rod is of a wedge-shaped structure and fits with the inclined surface of the wedge-shaped plate. A transmission bevel gear is fixedly arranged outside the round rod at the free end of the telescopic rod. The transmission bevel gear is meshed and connected with the driven bevel gear. The driven rubber wheel is frictionally connected with the rubber wheel at the end of the clamping shaft.

[0011] Optionally, a fixing plate and a locking plate are clamped on the U-shaped rod. A fixed sleeve is fixedly arranged at the outer end of the fixing plate. The bottom end of the plug rod is connected to the inside of the fixed sleeve through a spring. The longitudinal rod of the plug rod is made of a flexible material and the cross rod is of a rigid structure rod. The end of the plug rod is a clamping block. The clamping block is clamped inside the locking hole on the rotating locking plate. The locking hole is of an arc structure and the diameter of the end round hole is larger than the maximum diameter of the clamping block. The rotating locking plate is movably connected to the end face of the locking plate through a shaft.

[0012] Beneficial effects

[0013] For the low-nitrogen combustion boiler unit according to the embodiments of the present invention, compared with the traditional boiler unit, after the clamping shaft drives the driven rubber wheel to rotate, it coaxially drives the transmission bevel gear to rotate, drives the driven bevel gear to rotate through meshing, and then drives the connecting shaft to rotate. The transmission ratio is realized through the transmission bevel gear and the driven bevel gear, making it easier to accurately control the rotation angle of the baffle;

[0014] In addition, when starting to retract the telescopic rod, it drives the connecting rod to move leftward. The leftward movement of the connecting rod pushes the wedge plate upward, thereby driving the clamping shaft upward. As a result, the driven rubber wheel moves leftward and gradually disengages from the rubber wheel at the bottom end of the clamping shaft. After the lifting rod is started, it drives the connecting rod to move, and at the same time drives the shaft inside the lifting fixed tube to move, and also drives the driven bevel gear at the top end of the shaft to move, so that the top card slot inside the driven bevel gear is clamped to the bottom end of the clamping shaft, making the clamping shaft and the driven bevel gear coaxially clamped. After starting the drive motor again, the driven bevel gear rotates proportionally to achieve the second speed ratio. The rotation angle can be observed through the dial, helping the operator to clearly know the angle and position of the baffle outside and understand the fuel delivery situation in the main combustion area;

[0015] In addition, after the U-shaped rod passes through the bottom plate of the burner and the installation platform, the lock plate is clamped onto the U-shaped rod, and then the insertion rod penetrates through the inside of the U-shaped rod. After the clamping block is clamped into the lock hole, rotate the lock plate to make the clamping block clamped into the lock hole to complete the locking, reducing the use of bolt assemblies and improving the disassembly and assembly speed for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0017] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0018] In the drawings:

[0019] Figure 1 shows a schematic structural diagram of the installation platform according to the present invention;

[0020] Figure 2 shows a schematic structural diagram of the drive assembly according to the present invention;

[0021] Figure 3 shows a schematic structural diagram of the telescopic rod according to the present invention;

[0022] Figure 4 shows a schematic structural diagram of the drive assembly according to the present invention;

[0023] Figure 5 shows a schematic structural diagram of the lifting assembly according to the present invention;

[0024] Figure 6 shows a schematic structural diagram of the transmission bevel gear according to the present invention;

[0025] Figure 7 shows a schematic structural diagram of the locking member according to the present invention;

[0026] Figure 8 shows according to the present invention Figure 3 an enlarged schematic structural diagram at A in.

[0027] List of reference numerals

[0028] 1. Installation platform; 101. Boiler; 2. Burner; 201. Body; 202. Delivery pipe; 3. Drive assembly; 31. Drive motor; 3101. Rotating shaft; 32. Mounting plate; 33. Base plate; 3301. Dial; 3302. Staple; 34. Coupling shaft; 3401. Baffle; 4. Housing; 401. Fixed pipe; 402. Card shaft; 5. Lifting assembly; 51. Lifting fixed pipe; 5101. Driven bevel gear; 5102. Lifting pipe; 52. Lifting rod; 5201. Connecting rod; 6. Moving assembly; 61. Telescopic rod; 6101. Link; 6102. Driving bevel gear; 6103. Driven rubber wheel; 62. Wedge plate; 7. Locking member; 71. U-shaped rod; 72. Fixed plate; 7201. Fixed sleeve; 73. Insert rod; 7301. Block; 74. Locking plate; 75. Rotating locking plate; 7501. Lock hole. Detailed implementation manners

[0029] In order to make the objectives, solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components.

[0030] Embodiment: As shown in the attached Figure 1 to the attached Figure 8 figures:

[0031] The present invention provides a low-nitrogen combustion boiler unit, which includes an installation platform 1, a drive assembly 3, a housing 4, a lifting assembly 5, a moving assembly 6 and a locking member 7; a burner 2 and a boiler 101 are fixedly installed on the top surface of the installation platform 1; a delivery pipe 202 is arranged on the burner 2, and the end of the delivery pipe 202 is fixedly communicated with the inside of the boiler 101; the drive assembly 3 is installed on the burner 2, and the drive assembly 3 includes a drive motor 31, a mounting plate 32, a base plate 33 and a coupling shaft 34; the housing 4 is installed at the bottom of the drive motor 31; the lifting assembly 5 includes a lifting fixed pipe 51 and a lifting rod 52, the bottom of the lifting fixed pipe 51 is fixedly connected to the top surface of the base plate 33, the lifting rod 52 is an electrically driven lifting structure telescopic rod, and the top end of the push rod of the lifting rod 52 is fixedly connected to the shaft inside the lifting fixed pipe 51 through a connecting rod 5201; the moving assembly 6 is installed inside the housing 4, and the moving assembly 6 is composed of a telescopic rod 61 and a wedge plate 62; the locking member 7 is fixedly connected to the periphery of the bottom of the burner 2 and the top surface of the installation platform 1, and the locking member 7 includes a U-shaped rod 71, a fixed plate 72, an insert rod 73, a locking plate 74 and a rotating locking plate 75.

[0032] In addition, as shown in the attachedFigure 7 As shown, a fixing plate 72 and a locking plate 74 are clamped on a U-shaped rod 71. A fixed sleeve 7201 is fixedly arranged at the outer end of the fixing plate 72. The inner part of the fixed sleeve 7201 is connected to the bottom end of a plug rod 73 through a spring. The longitudinal rod of the plug rod 73 is made of flexible material and the cross rod is a rigid structural rod. The end of the plug rod 73 is a clamping block 7301. The clamping block 7301 is clamped inside a locking hole 7501 on a rotary locking plate 75. The locking hole 7501 is of an arc structure and the diameter of the end circular hole is larger than the maximum diameter of the clamping block 7301. The rotary locking plate 75 is movably connected to the end face of the locking plate 74 through a shaft. After the U-shaped rod 71 passes through the bottom plate of the burner 2 and the installation platform 1, the locking plate 74 is clamped onto the U-shaped rod 71. Then the plug rod 73 penetrates through the inside of the U-shaped rod 71. After the clamping block 7301 is clamped inside the locking hole 7501, the rotary locking plate 75 is rotated to make the clamping block 7301 clamped inside the locking hole 7501, completing the locking, reducing the use of bolt assemblies and improving the disassembly and assembly speed for maintenance.

[0033] In addition, as shown in the attached Figure 2 and attached Figure 4 As shown, a rotating shaft 3101 is clamped inside the bottom of the drive shaft of a drive motor 31. The lower part of the rotating shaft 3101 is clamped to a clamping shaft 402. A mounting plate 32 is fixedly connected to the bottom of the outer shell of the drive motor 31. A bottom plate 33 is fixedly connected to the bottom of the mounting plate 32. A dial 3301 is arranged on the top surface of the bottom plate 33. Fixing nails 3302 are fixedly clamped outside the dial 3301 on the top surface of the bottom plate 33. The center of the inside of the dial 3301 is penetrated by a lifting fixed tube 51. The top end of a connecting shaft 34 is fixedly clamped to the bottom end of the shaft inside the lifting fixed tube 51. A baffle 3401 is fixedly connected to the connecting shaft 34. When the lifting fixed tube 51 rotates, it drives the external pointer to rotate and also drives the connecting shaft 34 to rotate. Thus, the rotation angle can be observed through the dial 3301 to help the operator clearly know the angle and position of the baffle 3401 outside and understand the fuel delivery situation in the main combustion area.

[0034] In addition, as shown in the attached Figure 5 and attached Figure 6 and attached Figure 8As shown, the fixed end of the telescopic rod 61 is fixedly connected to the mounting plate 32. At the end of the free-end round rod, there is a driven rubber wheel 6103. Above the free-end round rod of the telescopic rod 61, there is a connecting rod 6101. The end of the connecting rod 6101 is a wedge-shaped structure and fits with the inclined surface of the wedge plate 62. Outside the free-end round rod of the telescopic rod 61, a driving bevel gear 6102 is fixedly arranged. The driving bevel gear 6102 is meshed and connected with the driven bevel gear 5101. The driven rubber wheel 6103 is in frictional connection with the rubber wheel at the end of the clamping shaft 402. When the clamping shaft 402 drives the driven rubber wheel 6103 to rotate, it coaxially drives the driving bevel gear 6102 to rotate. Through meshing, it drives the driven bevel gear 5101 to rotate, and then drives the coupling shaft 34 to rotate. The transmission ratio is achieved through the driving bevel gear 6102 and the driven bevel gear 5101, making it easier to accurately control the rotation angle of the baffle 3401. When the telescopic rod 61 is started to be retracted, it drives the connecting rod 6101 to move leftward. The leftward movement of the connecting rod 6101 pushes the wedge plate 62 to move upward, thereby driving the clamping shaft 402 to move upward. The driven rubber wheel 6103 moves leftward and gradually disengages from the rubber wheel at the bottom end of the clamping shaft 402, so that after the lifting assembly 5 moves upward, it can be coaxially clamped with the clamping shaft 402 to change the transmission ratio.

[0035] In addition, as shown in the Figure 3 and Figure 5 figure, inside the housing 4, a fixed pipe 401 and a clamping shaft 402 are installed. Among them, the fixed pipe 401 is fixedly connected to the inner top surface of the housing 4. On the left side of the fixed pipe 401, there is a slideway. Inside the slideway, the wedge plate 62 is slidably clamped. The clamping shaft 402 is clamped to the bottom of the rotating shaft 3101 through a clamping pin. The bottom end of the clamping shaft 402 is a conical rubber wheel. The outside of the clamping shaft 402 is clamped to the right end of the wedge plate 62, and the clamping shaft 402 is movably clamped inside the fixed pipe 401. When the driving motor 31 is started, it drives the clamping shaft 402 to rotate through the rotating shaft 3101, and synchronously drives the conical rubber wheel to rotate to achieve driving. When the wedge plate 62 moves upward, it synchronously drives the clamping shaft 402 to move upward. The clamping shaft 402 is clamped inside the fixed pipe 401 through a clamping pin and simultaneously moves upward inside the bottom of the rotating shaft 3101. When the rotating shaft 3101 rotates again, it can still drive the clamping shaft 402 to rotate.

[0036] In addition, as shown in the Figure 5 and Figure 8As shown in the figure, a driven bevel gear 5101 is provided at the top end of the shaft inside the lifting and fixing pipe 51. A lifting pipe 5102 is slidably clamped inside the lifting and fixing pipe 51. The through groove at the left end of the lifting pipe 5102 is penetrated by a connecting rod 5201. When the lifting rod 52 is started, it drives the connecting rod 5201 to move, and at the same time drives the shaft inside the lifting and fixing pipe 51 to move, and also drives the driven bevel gear 5101 at the top end of the shaft to move, so that the top card slot of the driven bevel gear 5101 is clamped inside the bottom end of the card shaft 402, making the card shaft 402 and the driven bevel gear 5101 coaxially clamped. After the drive motor 31 is started again, the driven bevel gear 5101 rotates proportionally to achieve the second speed ratio.

[0037] In addition, as shown in the appendix Figure 1 As shown in the figure, a body 201 is also provided on the burner 2. The body 201 is fixedly connected to the middle section of the burner 2, and the right end is fixedly connected to the conveying pipe 202. The upper part inside the boiler 101 is the reburning zone. The body 201 of the burner 2 is used to reduce the oxygen concentration, and is conveyed to the inside of the boiler 101 through the conveying pipe 202 for the first-stage main combustion. Using the hydrocarbon radicals and unburned products such as CO, H2, and C generated by the combustion in the main combustion zone, NO is reduced to N2. Eighty percent of the fuel is sent into the main combustion zone through the burner 2, and the fuel burns in the main combustion zone to generate NO X , and twenty percent of the fuel is sent into the reburning zone. The air coefficient in the reburning zone is less than 1, with strong reducibility, so that the NO generated in the main combustion zone X is reduced, thus ensuring that the unburned products are completely burned out, and achieving low-nitrogen combustion through staged combustion.

[0038] Specific usage method and function of this embodiment: In the present invention, after the U-shaped rod 71 passes through the bottom plate of the burner 2 and the installation platform 1, the lock plate 74 is clamped onto the U-shaped rod 71, and then the insertion rod 73 penetrates through the inside of the U-shaped rod 71. After the clamping block 7301 is clamped into the lock hole 7501, the rotating lock plate 75 is rotated to make the clamping block 7301 clamped into the lock hole 7501 to complete the locking, reducing the use of bolt assemblies and improving the disassembly and assembly speed for maintenance;

[0039] When the card shaft 402 drives the driven rubber wheel 6103 to rotate, it coaxially drives the driving bevel gear 6102 to rotate, and drives the driven bevel gear 5101 to rotate through meshing, and then drives the coupling shaft 34 to rotate. The transmission ratio is achieved through the driving bevel gear 6102 and the driven bevel gear 5101, making it easier to accurately control the rotation angle of the baffle 3401;

[0040] When starting to retract the telescopic rod 61, it drives the connecting rod 6101 to move leftward. The leftward movement of the connecting rod 6101 pushes the wedge-shaped plate 62 upward, thereby driving the clamping shaft 402 upward. As a result, the driven rubber wheel 6103 moves leftward and gradually disengages from the rubber wheel at the bottom end of the clamping shaft 402. After the lifting rod 52 is started, it drives the connecting rod 5201 to move, and at the same time drives the shaft inside the lifting fixed tube 51 to move, and also drives the driven bevel gear 5101 at the top of the shaft to move, so that the top card slot inside the driven bevel gear 5101 is clamped at the bottom end of the clamping shaft 402, making the clamping shaft 402 and the driven bevel gear 5101 coaxially clamped. After starting the drive motor 31 again, the driven bevel gear 5101 rotates proportionally to achieve the second speed ratio. The rotation angle can be observed through the dial 3301, which helps the operator to clearly know the angle and position of the baffle 3401 outside and understand the fuel delivery situation in the main combustion area.

Claims

1. A low-nitrogen combustion boiler unit, characterized in that, It includes an installation platform (1), a drive assembly (3), a housing (4), a lifting assembly (5), a moving assembly (6), and a locking member (7); a burner (2) and a boiler (101) are fixedly installed on the top surface of the installation platform (1); a conveying pipe (202) is provided on the burner (2), and the end of the conveying pipe (202) is fixedly connected to the inside of the boiler (101); the drive assembly (3) is installed on the burner (2), and the drive assembly (3) includes a drive motor (31), a mounting plate (32), a bottom plate (33), and a coupling shaft (34); the housing (4) is installed at the bottom of the drive motor (31); the lifting assembly (5) includes a lifting fixed pipe (51) and a lifting rod (52), the bottom of the lifting fixed pipe (51) is fixedly connected to the top surface of the bottom plate (33), the lifting rod (52) is an electrically driven lifting structure telescopic rod, and the top of the push rod of the lifting rod (52) is fixedly connected to the shaft inside the lifting fixed pipe (51) through a connecting rod (5201); the moving assembly (6) is installed inside the housing (4), and the moving assembly (6) is composed of a telescopic rod (61) and a wedge plate (62); the locking member (7) is fixedly connected to the periphery of the bottom of the burner (2) and the top surface of the installation platform (1). A rotating shaft (3101) is clamped inside the bottom of the drive shaft of the drive motor (31), the rotating shaft (3101) is clamped to a clamping shaft (402) below, the mounting plate (32) is fixedly connected to the bottom of the outer shell of the drive motor (31), the bottom plate (33) is fixedly connected to the bottom of the mounting plate (32), a dial (3301) is arranged on the top surface of the bottom plate (33), a nail (3302) is fixedly clamped outside the dial (3301) on the top surface of the bottom plate (33), the center of the inside of the dial (3301) is penetrated by the lifting fixed pipe (51), the top of the coupling shaft (34) is fixedly clamped to the bottom end of the shaft inside the lifting fixed pipe (51), and a baffle (3401) is fixedly connected to the coupling shaft (34). A fixed pipe (401) and a clamping shaft (402) are installed inside the housing (4), wherein the fixed pipe (401) is fixedly connected to the inner top surface of the housing (4), a slideway is arranged on the left side of the fixed pipe (401), the wedge plate (62) is slidably clamped inside the slideway, the clamping shaft (402) is clamped to the bottom of the rotating shaft (3101) through a pin, the bottom end of the clamping shaft (402) is a conical rubber wheel, the outside of the clamping shaft (402) is clamped to the right end of the wedge plate (62), and the clamping shaft (402) is movably clamped inside the fixed pipe (401). A driven bevel gear (5101) is arranged at the top end of the shaft inside the lifting fixed pipe (51), a lifting pipe (5102) is slidably clamped inside the lifting fixed pipe (51), and the through groove at the left end of the lifting pipe (5102) is penetrated by the connecting rod (5201). The fixed end of the telescopic rod (61) is fixedly connected to the mounting plate (32). At the end of the free-end round rod, a driven rubber wheel (6103) is provided. Above the free-end round rod of the telescopic rod (61), a connecting rod (6101) is provided. The end of the connecting rod (6101) is a wedge-shaped structure and fits against the inclined surface of the wedge plate (62). Outside the free-end round rod of the telescopic rod (61), a driving bevel gear (6102) is fixedly provided. The driving bevel gear (6102) is meshed and connected with the driven bevel gear (5101). The driven rubber wheel (6103) is in frictional connection with the rubber wheel at the end of the clamping shaft (402).

2. The low-nitrogen combustion boiler unit according to claim 1, characterized in that: On the burner (2), a machine body (201) is further provided. The machine body (201) is fixedly connected to the middle section of the burner (2), and the right end is fixedly connected to the conveying pipe (202). Above the inside of the boiler (101) is the reburning zone.

3. The low-nitrogen combustion boiler unit according to claim 1, characterized in that: The locking member (7) includes a U-shaped rod (71), a fixing plate (72), a plug rod (73), a locking plate (74) and a rotating locking plate (75). The fixing plate (72) and the locking plate (74) are clamped on the U-shaped rod (71). On the outer side end of the fixing plate (72), a fixed sleeve (7201) is fixedly provided. Inside the fixed sleeve (7201), the bottom end of the plug rod (73) is connected by a spring. The longitudinal rod of the plug rod (73) is made of a flexible material and the cross rod is a hard-structured rod. The end of the plug rod (73) is a clamping block (7301). The clamping block (7301) is clamped inside the locking hole (7501) on the rotating locking plate (75). The locking hole (7501) is an arc-shaped structure and the diameter of the end circular hole is larger than the maximum diameter of the clamping block (7301). The rotating locking plate (75) is movably connected to the end face of the locking plate (74) through a shaft.

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