Dry slag discharger for coal-fired power plants

Abstract

The present application relates to a kind of dry slagging machines of coal-fired power plant, including steel band machine, cleaning chain and spray unit;The middle part of steel band machine is equipped with first transition section, one end is equipped with first climbing section, for the slag discharged by boiler is transported to the slag collecting hopper, slag well or slag crusher.The cleaning chain is overall arranged below the steel band machine, middle part is equipped with second transition section, one end close to first climbing section is equipped with second climbing section, for the ash falling from steel band machine to cleaning chain is also transported to the slag collecting hopper, slag well or slag crusher.Spray unit is arranged between first transition section and second transition section and between first climbing section and second climbing section, can produce mist drop.Mist drop combines with the ash that goes up, increases the weight of ash.When the air volume that flows into air inlet is too large, fine ash on the climbing section of cleaning chain will not be sucked back to the horizontal section of cleaning chain, avoid local ash deposition of cleaning chain too much, solve the problem of ash return, improve the operation load capacity of dry slagging machine.

Description

Technical Field

[0001] This invention relates to the field of dry ash removal machine technology, specifically to a dry ash removal machine for coal-fired power plants. Background Technology

[0002] Dry ash removers are installed below the boiler bottom ash removal device. They primarily utilize steel belts to transport and cool hot ash, eliminating the need for a slag water treatment system and reducing environmental pollution. Existing dry ash removers consist of a steel belt conveyor and a cleaning chain, each with a horizontal section, a transition section, and a climbing section with a certain incline. Both the steel belt conveyor and the cleaning chain are enclosed in a housing. The steel belt conveyor transports the boiler ash to the ash collection hopper, ash well, or ash crusher. The cleaning chain is located below the steel belt conveyor; some ash falls from the steel belt conveyor onto the cleaning chain, which then transports this portion of ash to the ash collection hopper, ash well, or ash crusher. The housing has a horizontal section at one end, a transition section in the middle, and a climbing section at the other end. Air inlets are located at the ends of the horizontal and climbing sections furthest from the transition sections, respectively, to introduce cold air and cool the ash transported by the steel belt conveyor.

[0003] As cost reduction requirements increase, the quality of incoming coal gradually declines, with higher sulfur content and other pollutants. During high boiler load periods, coal consumption increases, coking within the furnace intensifies, and ash shedding significantly increases, leading to a greater load on the dry ash discharger. Due to the increased ash shedding, and considering the limited driving force of the drive motor, the number of scrapers on the cleaning chain cannot be increased indefinitely. Furthermore, the actual operating space of the cleaning chain restricts the increase in the height of the scrapers. When the airflow into the air inlet is excessive, the fine ash on the climbing section of the cleaning chain is affected by the negative pressure inside the furnace, creating a phenomenon similar to a sandstorm. This fine ash is drawn back to the horizontal section of the cleaning chain, forming hill-like deposits. This results in excessive ash accumulation in certain areas of the cleaning chain, easily clogging the rotating parts, lifting and derailing the drive chains, and ultimately forcing the equipment to stop operating.

[0004] Therefore, how to prevent fine dust located on the climbing section of the cleaning chain from being drawn back to the horizontal section of the cleaning chain when the air volume flowing into the air inlet is too large has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the problem that when the airflow into the air inlet is too large, the fine ash located on the climbing section of the cleaning chain is easily drawn back to the horizontal section of the cleaning chain due to the negative pressure inside the furnace, this invention provides a dry ash removal machine for coal-fired power plants.

[0006] To achieve the purpose of this invention, a dry ash removal machine for coal-fired power plants is provided, comprising:

[0007] The steel belt conveyor has a first transition section in the middle and a first climbing section at one end.

[0008] The cleaning chain is located below the steel belt conveyor, with a second transition section in the middle and a second climbing section at one end near the first climbing section.

[0009] The spray unit, located between the first transition section and the second transition section and between the first climbing section and the second climbing section, is capable of generating mist droplets.

[0010] In some specific embodiments, the spray unit includes:

[0011] The lower spray section is located between the first transition section and the second transition section and is capable of generating mist droplets;

[0012] The central spray section, located between the end of the first climbing section near the first transition section and the end of the second climbing section near the second transition section, can also generate mist droplets;

[0013] The upper spray section, located between the end of the first climbing section away from the first transition section and the end of the second climbing section away from the second transition section, can also generate mist droplets.

[0014] In some specific embodiments, the lower spray section includes:

[0015] The axis of the infusion tube is perpendicular to the length of the steel belt conveyor.

[0016] Multiple atomizing nozzles are evenly fixed on the infusion tube along its axial direction.

[0017] The structure of the lower spray section is the same as that of the middle spray section and the upper spray section.

[0018] In some specific embodiments, the axis of each atomizing nozzle is set horizontally.

[0019] In some specific embodiments, the axial distance between any two adjacent atomizing nozzles is 20cm-50cm;

[0020] The axial distance between the infusion tubes of the lower spray section and the middle spray section is 50cm-100cm; the axial distance between the infusion tubes of the middle spray section and the upper spray section is 50cm-100cm.

[0021] In some specific embodiments, it also includes:

[0022] A liquid storage tank is used to store water.

[0023] The pump is connected to the liquid storage tank, the liquid delivery pipe of the lower spray section, the liquid delivery pipe of the middle spray section, and the liquid delivery pipe of the upper spray section, respectively.

[0024] In some specific embodiments, the first transition section includes an upper steel strip transition section and a lower steel strip transition section; the second transition section includes an upper cleaning chain transition section and a lower cleaning chain transition section.

[0025] Also includes:

[0026] The first idler roller consists of two rollers, which are rotatably positioned below the upper steel strip transition section and the lower steel strip transition section, respectively, and their sidewalls abut against the bottom surface of the upper steel strip transition section and the bottom surface of the lower steel strip transition section, respectively.

[0027] The second idler roller consists of two rollers, which are rotatably positioned below the upper cleaning chain transition section and the lower cleaning chain transition section, respectively, with their sidewalls abutting against the bottom surface of the upper cleaning chain transition section and the bottom surface of the lower cleaning chain transition section, respectively.

[0028] In some specific embodiments, it also includes:

[0029] The first pressure roller consists of two rollers, which are rotatably positioned above the upper steel strip transition section and the lower steel strip transition section, respectively, and their sidewalls abut against the top surface of the upper steel strip transition section and the top surface of the lower steel strip transition section, respectively.

[0030] The second pressure roller consists of two rollers, which are rotatably positioned above the upper cleaning chain transition section and the lower cleaning chain transition section, respectively, with their sidewalls abutting against the top surface of the upper cleaning chain transition section and the top surface of the lower cleaning chain transition section, respectively.

[0031] In some specific embodiments, it also includes:

[0032] There are two straightening wheels, which are rotatably mounted on opposite sides of the steel belt conveyor, with their sidewalls abutting against the opposite sides of the steel belt conveyor.

[0033] In some specific embodiments, it also includes:

[0034] The enclosure has a horizontal section at one end, a transition section in the middle, and a climbing section at the other end; air inlets are provided at the ends of the horizontal section and the climbing section away from the transition section, respectively.

[0035] The first transition section of the steel belt conveyor and the second transition section of the cleaning chain are located inside the transition box section;

[0036] The first climbing section of the steel belt conveyor and the second climbing section of the cleaning chain are located inside the climbing box section;

[0037] The two ends of the infusion tube of the lower spray section are detachably connected to the two sides of the transition box section, respectively.

[0038] The two ends of the infusion tube in the middle spray section are detachably connected to the two sides of the climbing box section, respectively.

[0039] The two ends of the infusion tube of the upper spray section are detachably connected to the two sides of the climbing box section.

[0040] The beneficial effects of this invention are as follows: The dry ash removal machine for coal-fired power plants of this invention is equipped with a steel belt conveyor, which is used to transport the ash discharged from the boiler to the ash collection hopper, ash well, or ash crusher. A cleaning chain is used to transport the ash that falls from the steel belt conveyor onto the cleaning chain to the ash collection hopper, ash well, or ash crusher. A spray unit is located between the first and second transition sections and between the first and second climbing sections, capable of generating mist droplets. The mist droplets combine with the rising ash, increasing the weight of the ash. When the airflow into the air inlet is too large, the fine ash located on the climbing section of the cleaning chain is affected by the negative pressure inside the furnace and will not be drawn back to the horizontal section of the cleaning chain, avoiding excessive local ash accumulation on the cleaning chain, solving the ash return problem, and improving the operating load capacity of the dry ash removal machine. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of some specific embodiments of a dry ash removal machine for coal-fired power plants according to the present invention;

[0042] Figure 2 yes Figure 1 The diagram shows a schematic representation of a specific embodiment of the spray unit in a dry ash removal machine for a coal-fired power plant.

[0043] In the attached diagram, 110 is a steel belt conveyor; 120 is a cleaning chain; 130 is a spray unit; 131 is a lower spray section; 1311 is an infusion pipe; 1312 is an atomizing nozzle; 132 is a middle spray section; 133 is an upper spray section; 140 is a liquid storage tank; 150 is a pump; 161 is a first idler roller; 162 is a second idler roller; 171 is a first pressure roller; 172 is a second pressure roller; 181 is a horizontal box section; 182 is a transition box section; and 183 is a climbing box section. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0045] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0046] In the description of this invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axis", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," "linking," "hinging," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] As in the background technology, due to the increased amount of slag falling, combined with the limited driving force of the drive motor, it is impossible to increase the number of scrapers on the cleaning chain indefinitely. Furthermore, the height of the scrapers on the cleaning chain cannot be increased due to the actual operating space of the cleaning chain. When the airflow into the air inlet is too large, the fine ash on the climbing section of the cleaning chain is affected by the negative pressure inside the furnace, producing a phenomenon similar to a sandstorm. This fine ash will be drawn back to the horizontal section of the cleaning chain and form hill-like deposits, causing excessive local ash accumulation on the cleaning chain. This can easily clog the rotating parts of the cleaning chain, lift up and derail each transmission chain, and ultimately force the equipment to stop operating.

[0050] To improve the above problems, refer to Figure 1 and Figure 2A dry ash removal machine for coal-fired power plants is provided, comprising a steel belt conveyor 110, a cleaning chain 120, and a spray unit 130. The steel belt conveyor 110 has a first transition section in the middle and a first climbing section at one end, used to transport boiler ash to a ash collection hopper, ash well, or ash crusher. The cleaning chain 120 is located entirely below the steel belt conveyor 110, with a second transition section in the middle and a second climbing section at the end near the first climbing section, used to transport boiler ash falling from the steel belt conveyor 110 onto the cleaning chain 120 to the ash collection hopper, ash well, or ash crusher. It should be noted that the climbing angle of the first climbing section is greater than that of the second climbing section. The spray unit 130 is located between the first and second transition sections and between the first and second climbing sections, and is capable of generating mist droplets. The mist droplets combine with the rising boiler ash, increasing the weight of the ash. When the airflow into the air inlet is too large, the fine ash on the climbing section of the cleaning chain 120 will not be drawn back to the horizontal section of the cleaning chain 120 due to the negative pressure inside the furnace. This avoids excessive local ash accumulation on the cleaning chain 120, solves the problem of ash return, and improves the operating load capacity of the dry ash discharger.

[0051] Specifically, in the exemplary embodiment, the spray unit 130 includes a lower spray section 131, a middle spray section 132, and an upper spray section 133. The lower spray section 131 is located between the first transition section and the second transition section and is capable of generating droplets that act on the ash rising from the second transition section. The middle spray section 132 is located between the end of the first climbing section near the first transition section and the end of the second climbing section near the second transition section, and is capable of generating droplets that act on the ash rising from the end of the second climbing section near the second transition section. The upper spray section 133 is located between the end of the first climbing section away from the first transition section and the end of the second climbing section away from the second transition section, and is also capable of generating droplets that act on the ash rising from the end of the second climbing section away from the second transition section. The stratified formation of droplets greatly improves the weight gain effect on the ash, thereby preventing the fine ash located on the climbing section of the cleaning chain 120 from being drawn back to the horizontal section of the cleaning chain 120. Preferably, the lower spray section 131 includes an infusion tube 1311 and an atomizing nozzle 1312. The axis of the infusion tube 1311 is perpendicular to the length direction of the steel belt conveyor 110. There are 3-6 atomizing nozzles 1312, evenly fixed to the infusion tube 1311 along its axial direction. The structure of the lower spray section 131 is the same as that of the middle spray section 132 and the upper spray section 133. It should be noted that the atomizing nozzle 1312 can be a 360° rotatable nozzle.

[0052] Preferably, in the exemplary embodiment, the axis of each atomizing nozzle 1312 is horizontally arranged. The axial distance between any two adjacent atomizing nozzles 1312 is 20cm-50cm. The axial distance between the liquid delivery pipe 1311 of the lower spray section 131 and the liquid delivery pipe 1311 of the middle spray section 132 is 50cm-100cm; the axial distance between the liquid delivery pipe 1311 of the middle spray section 132 and the liquid delivery pipe 1311 of the upper spray section 133 is 50cm-100cm. This ensures the weight gain effect on the furnace ash.

[0053] Preferably, in the exemplary embodiment, the dry ash removal machine for coal-fired power plants further includes a liquid storage tank 140, a pump 150, a temperature sensor, and a processor. The liquid storage tank 140 is used to store water. The pump 150 is fixed to the housing and is connected via hoses to the interior of the liquid storage tank 140, one end of the liquid delivery pipe 1311 of the lower spray section 131, one end of the liquid delivery pipe 1311 of the middle spray section 132, and one end of the liquid delivery pipe 1311 of the upper spray section 133, respectively, enabling it to deliver water to the liquid delivery pipes 1311 of the lower spray section 131, the middle spray section 132, and the upper spray section 133. It should be noted that the boiler, pump 150, and spray sections can also be directly connected on-site via hoses, making water intake more convenient. The humidity sensor is installed on the inner wall of the climbing box section 183 and can detect the humidity of the ash on the second climbing section of the cleaning chain 120, transmitting the detected humidity value to the processor. The processor is electrically connected to the humidity sensor and pump 150, respectively. It can compare the received humidity value with the preset humidity value and send a spray command to pump 150 based on the comparison result. Pump 150 intermittently delivers water to the delivery pipe 1311 of the lower spray section 131, the delivery pipe 1311 of the middle spray section 132, and the delivery pipe 1311 of the upper spray section 133, with each delivery lasting 2-10 seconds. In this way, the humidity of the furnace ash on the second climbing section of the cleaning chain 120 is moderate, not too high to make the furnace ash liquid, and the furnace ash appearance is not caking, so as not to cause blockage of the production equipment in the next stage.

[0054] Specifically, in the example, the first transition section includes an upper steel belt transition section and a lower steel belt transition section. The second transition section includes an upper cleaning chain 120 transition section and a lower cleaning chain 120 transition section. The dry ash removal machine for coal-fired power plants also includes two first idler rollers 161, two second idler rollers 162, two first pressure rollers 171, two second pressure rollers 172, and two straightening wheels. The two first idler rollers 161 are rotatably disposed below the upper steel belt transition section and the lower steel belt transition section, respectively, and their sidewalls abut against the bottom surfaces of the upper and lower steel belt transition sections, respectively, for supporting the carrying steel belt. The two second idler rollers 162 are rotatably disposed below the upper cleaning chain 120 transition section and the lower cleaning chain 120 transition section, respectively, and their sidewalls abut against the bottom surfaces of the upper and lower cleaning chain 120 transition sections, respectively, for supporting the carrying cleaning chain 120. Two first pressure rollers 171 are rotatably positioned above the upper and lower steel strip transition sections, respectively, with their sidewalls abutting the top surfaces of the upper and lower steel strip transition sections, respectively, to redirect the conveying direction of the steel strip. Two second pressure rollers 172 are rotatably positioned above the upper and lower cleaning chain 120 transition sections, respectively, with their sidewalls abutting the top surfaces of the upper and lower cleaning chain 120 transition sections, respectively, to redirect the conveying direction of the cleaning chain 120. Two straightening wheels are rotatably positioned on opposite sides of the steel strip conveyor 110, with their sidewalls abutting the opposite sides of the steel strip conveyor 110, to achieve forced straightening of the steel strip.

[0055] It should be noted that first idler rollers 161 are also provided below the horizontal section and the climbing section of the steel belt to support the corresponding parts of the steel belt.

[0056] Specifically, in the exemplary example, the dry ash removal machine for coal-fired power plants also includes a housing. One end of the housing has a horizontal section 181, the middle has a transition section 182, and the other end has a climbing section 183. Air inlets are located at the ends of the horizontal section 181 and climbing section 183 away from the transition section 182, respectively. Cooling air is introduced into the housing through the air inlets to cool the steel belt. The first transition section of the steel belt conveyor 110 and the second transition section of the cleaning chain 120 are located within the transition section 182. The first climbing section of the steel belt conveyor 110 and the second climbing section of the cleaning chain 120 are located within the climbing section 183. The opposite ends of the liquid delivery pipe 1311 of the lower spray section 131 are detachably connected to the opposite sides of the transition section 182 via mounting plates and bolts, facilitating the disassembly, replacement, cleaning, and installation of the lower spray section 131. The opposite ends of the infusion pipe 1311 of the middle spray section 132 are detachably connected to the opposite sides of the climbing box section 183 via mounting plates and bolts, respectively, to facilitate the disassembly, replacement, cleaning, and installation of the lower spray section 131. The opposite ends of the infusion pipe 1311 of the upper spray section 133 are detachably connected to the opposite sides of the climbing box section 183 via mounting plates and bolts, respectively. Correspondingly, a first mounting hole for inserting the infusion pipe 1311 of the lower spray section 131 is provided on at least one side wall of the transition box section. A second mounting hole for inserting the infusion pipes 1311 of the middle spray section 132 and the upper spray section 133 is provided on at least one side wall of the climbing box section 183. The opposite ends of each first idler roller 161 are rotatably connected to the opposite sides of the transition box section 182 via bearings. The opposite ends of each second idler roller 162 are rotatably connected to the opposite sides of the transition box section 182 via bearings, respectively. The two opposite ends of each first pressure roller 171 are rotatably connected to the opposite sides of the transition box section 182 via bearings. The two opposite ends of each second pressure roller 172 are rotatably connected to the opposite sides of the transition box section 182 via bearings. The two straightening wheels are rotatably connected to the inner walls of the opposite sides of the transition box section 182 via brackets and bearings.

[0057] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "example," "specific example," "a specific embodiment," or "some examples," 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 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.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dry ash removal machine for coal-fired power plants, characterized in that, include: The steel belt conveyor has a first transition section in the middle and a first climbing section at one end. The cleaning chain is located below the steel belt conveyor, with a second transition section in the middle and a second climbing section at one end near the first climbing section. A spray unit is located between the first transition section and the second transition section, and between the first climbing section and the second climbing section, and is capable of generating mist droplets; The spray unit includes: The lower spray section is located between the first transition section and the second transition section and is capable of generating mist droplets; The central spray section, located between the end of the first climbing section near the first transition section and the end of the second climbing section near the second transition section, can also generate mist droplets; The upper spray section, located between the end of the first climbing section away from the first transition section and the end of the second climbing section away from the second transition section, can also generate mist droplets; The dry ash removal machine for coal-fired power plants also includes: A humidity sensor is used to detect the humidity of the ash on the second climbing section of the cleaning chain; The processor, electrically connected to the humidity sensor, is used to compare the detected humidity value with a preset humidity value; A pump, electrically connected to the processor, can control the pump to intermittently supply water to the spray unit based on a comparison result; The lower spray section includes: The infusion tube has its axis perpendicular to the length direction of the steel belt conveyor. Multiple atomizing nozzles are evenly fixed on the infusion tube along its axial direction. The structure of the lower spray section is the same as the structure of the middle spray section and the structure of the upper spray section; The axis of each atomizing nozzle is set horizontally; The axial distance between any two adjacent atomizing nozzles is 20cm-50cm; The axial distance between the infusion tube of the lower spray section and the infusion tube of the middle spray section is 50cm-100cm; the axial distance between the infusion tube of the middle spray section and the infusion tube of the upper spray section is 50cm-100cm. The first transition section includes an upper steel strip transition section and a lower steel strip transition section; the second transition section includes an upper cleaning chain transition section and a lower cleaning chain transition section. Also includes: The first idler roller consists of two rollers, which are rotatably disposed below the upper steel strip transition section and the lower steel strip transition section, respectively, and their sidewalls abut against the bottom surface of the upper steel strip transition section and the bottom surface of the lower steel strip transition section, respectively. There are two second idlers, which are rotatably disposed below the upper cleaning chain transition section and the lower cleaning chain transition section, respectively, and their sidewalls abut against the bottom surface of the upper cleaning chain transition section and the bottom surface of the lower cleaning chain transition section, respectively.

2. The dry ash removal machine for coal-fired power plants according to claim 1, characterized in that, Also includes: A liquid storage tank is used to store water. The pump is connected to the liquid storage tank, the liquid delivery pipe of the lower spray section, the liquid delivery pipe of the middle spray section, and the liquid delivery pipe of the upper spray section, respectively.

3. The dry ash removal machine for coal-fired power plants according to claim 1 or 2, characterized in that, Also includes: There are two first pressure rollers, which are rotatably disposed above the upper steel strip transition section and the lower steel strip transition section, respectively, and their sidewalls abut against the top surface of the upper steel strip transition section and the top surface of the lower steel strip transition section, respectively. There are two second pressure rollers, which are rotatably disposed above the upper cleaning chain transition section and the lower cleaning chain transition section, respectively, and their sidewalls abut against the top surface of the upper cleaning chain transition section and the top surface of the lower cleaning chain transition section, respectively.

4. The dry ash removal machine for coal-fired power plants according to claim 1 or 2, characterized in that, Also includes: There are two straightening wheels, which are rotatably mounted on opposite sides of the steel strip machine, with their sidewalls abutting against the opposite sides of the steel strip machine.

5. The dry ash removal machine for coal-fired power plants according to claim 1, characterized in that, Also includes: The enclosure has a horizontal section at one end, a transition section in the middle, and a climbing section at the other end; the horizontal section away from the transition section and the climbing section away from the transition section are respectively provided with air inlets; The first transition section of the steel belt conveyor and the second transition section of the cleaning chain are located within the transition box section; The first climbing section of the steel belt conveyor and the second climbing section of the cleaning chain are located within the climbing box section; The two ends of the infusion tube of the lower spray section are detachably connected to the two sides of the transition box section, respectively. The two ends of the infusion tube of the spray section are detachably connected to the two sides of the climbing box section, respectively. The two ends of the infusion tube of the upper spray section are detachably connected to the two sides of the climbing box section.

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