A urea injection pipe structure, a cleaning device and a cleaning method

Abstract

The application relates to a urea injection pipe structure, a cleaning device and a cleaning method, which comprise a connecting valve and an electromagnetic plug installed on the connecting valve, the connecting valve is provided with a flow guide pipe and a conveying pipe on the two sides respectively, a fixing disc is installed at the end of the conveying pipe, a plurality of first through holes are arranged on the fixing disc in a circumferentially equidistant manner, a conveying assembly matched with the first through holes is arranged in the conveying pipe, and the conveying assembly is used for discharging urea in the conveying pipe through the first through holes, and a through hole regulation mechanism is arranged on the fixing disc and connected with the conveying assembly, the through hole regulation mechanism can act when the conveying assembly moves, and the through state of the first through hole is adjusted, when urea crystals are generated in the first through hole, the movement of the through hole regulation mechanism is controlled through the conveying assembly, so that the first through hole is kept in an unobstructed state at all times.

Description

TECHNICAL FIELD

[0001] The present application relates to a urea injection pipe structure, a cleaning device and a cleaning method. BACKGROUND

[0002] Automobile urea mainly plays a role in purifying exhaust gas in vehicles. The scientific name of automobile urea is diesel exhaust fluid, which is applied to diesel engines. It can react with nitrogen oxides in exhaust gas to reduce nitrogen oxide emissions, while optimizing engine performance and fuel consumption.

[0003] The urea pipe is a pipeline for transporting and injecting urea solution, mainly used in the exhaust treatment device of the SCR system (selective catalytic reduction system) of the automobile. The SCR technology is a technology that sprays urea into the exhaust gas of the automobile to reduce the emission of nitrogen oxides (NOx).

[0004] When nitrogen oxides are found in the exhaust pipe, the urea tank automatically sprays diesel exhaust fluid. The diesel exhaust fluid and nitrogen oxides undergo oxidation-reduction reaction in the SCR catalytic reaction tank to generate non-polluting nitrogen and water vapor.

[0005] During the operation of the vehicle, due to the special nature of the urea solution, urea crystallization may occur in the urea pipeline and the urea injection pipe. Once crystallization occurs in the urea injection pipe, it may cause the urea injection pipe to be blocked, which may result in the urea not being able to be normally discharged, resulting in poor emission, reduced exhaust treatment effect, insufficient engine power, OBD light, and limited engine power.

[0006] At present, the urea injection pipe widely used is basically equipped with a heating device to prevent urea solution from crystallizing and freezing in a low temperature environment. The heating device generally uses engine coolant circulation for heating. However, during the initial period of cold start, the engine coolant actually needs a period of time to warm up, and even after the engine coolant temperature rises to the appropriate temperature, it also needs to gradually melt the crystallized urea, and the whole cycle is relatively long. SUMMARY

[0007] The purpose of the present application is to provide a urea injection pipe structure, a cleaning device and a cleaning method to solve the problems raised in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] A urea injection pipe structure, comprising:

[0010] A connecting valve and an electromagnetic plug installed on the connecting valve, the connecting valve being provided with a flow guide pipe and a conveying pipe on both sides thereof;

[0011] Also include:

[0012] A fixed disc is installed at the end of the conveying pipe, a plurality of first through holes are arranged on the fixed disc in a circumferential equidistant manner, a conveying assembly is arranged in the conveying pipe and matched with the first through holes, and the conveying assembly is used for discharging urea in the conveying pipe through the first through holes;

[0013] A through hole control mechanism is arranged on the fixed disc and connected with the conveying assembly, the through hole control mechanism can act when the conveying assembly moves, and the through state of the first through hole is adjusted.

[0014] As a further scheme of the present application, the conveying assembly comprises a sealing disc slidingly installed in the conveying pipe, a plurality of conveying holes are arranged on the sealing disc in a circumferential equidistant manner, a bellows is fixedly connected with the fixed disc and arranged on the sealing disc, and the bellows is matched with the conveying holes and the first through holes.

[0015] As a further scheme of the present application, the through hole control mechanism comprises a support sleeve installed on the sealing disc, a support rod rotatingly connected with the fixed disc is slidingly installed in the support sleeve, a rotating disc is arranged at one end of the support rod away from the support sleeve, a second through hole matched with the first through hole is arranged on the rotating disc, and an elastic assembly is arranged on the support sleeve.

[0016] As a further scheme of the present application, the elastic assembly comprises a helical groove arranged on the support rod, a limiting block slidingly connected with the helical groove is arranged on the inner wall of the support sleeve, a first spring is sleeved on the support sleeve and the support rod, and the two ends of the first spring are respectively abutted with the sealing disc and the fixed disc.

[0017] A cleaning device comprises:

[0018] A water tank and a protection tank installed on the water tank;

[0019] A support disc is installed on the water tank, a tapered sealing ring is arranged on the support disc, a pumping assembly connected with the support disc is arranged in the protection tank;

[0020] A clamping positioning mechanism is arranged on the support disc, a plurality of clamping plates arranged in a circumferential equidistant manner are connected with the clamping positioning mechanism, a spacing control assembly connected with the clamping positioning mechanism is arranged on the protection tank, the spacing control assembly can adjust the spacing between the clamping plates through the clamping positioning mechanism, and the urea injection pipe is controlled to move to a position matched with the tapered sealing ring.

[0021] As a further further scheme of the present application: the pumping assembly comprises a water pump installed in the protection box, the water pump is connected with an absorption pipe and a discharge pipe, the absorption pipe is connected with the water tank, and the discharge pipe penetrates through the protection box;

[0022] Further comprising a hollow pipe installed on the outer wall of the protection box, the hollow pipe is connected with the discharge pipe and fixedly connected with the support disc.

[0023] As a further further scheme of the present application: the clamping and positioning mechanism comprises a plurality of sliding grooves which are circumferentially equidistantly distributed on the support disc, a sliding block is slidingly installed in the sliding groove, a movable plate is arranged on the sliding block, a first hinged rod and a second hinged rod are hinged to the movable plate, the first hinged rod and the second hinged rod are hinged to the clamping plate, and a support assembly connected with the second hinged rod is arranged on the movable plate.

[0024] As a further further scheme of the present application: the support assembly comprises a hinged sleeve hinged to the movable plate, a movable rod is slidingly installed in the hinged sleeve, and a second spring is sleeved on the hinged sleeve and the movable rod;

[0025] Further comprising a clamping groove arranged on the hinged sleeve, and a protrusion slidingly connected with the clamping groove is arranged on the movable rod.

[0026] As a further further scheme of the present application: the spacing control assembly comprises a movable sleeve slidingly installed on the hollow pipe, a connecting rod hinged to the sliding block is hinged to the movable sleeve, and a pneumatic cylinder fixedly connected with the movable sleeve is arranged on the protection box.

[0027] A cleaning method of a urea injection pipe structure, comprising the following steps:

[0028] Step one: placing the urea injection pipe to be cleaned between the clamping plates;

[0029] Step two: under the action of the spacing control assembly, the plurality of clamping plates are controlled to move towards each other by the clamping and positioning mechanism, when the clamping plates move to the position of abutting the surface of the urea injection pipe, the urea injection pipe is controlled to move to the position of the central axis of the conical sealing ring and move towards the conical sealing ring under the action of the clamping and positioning mechanism;

[0030] Step three: when the urea injection pipe moves to the position of abutting the conical sealing ring, the urea injection pipe is ensured not to be separated from the conical sealing ring under the action of the clamping plate;

[0031] Step four: at this time, the hot water in the water tank can be transported into the urea injection pipe through the supporting disc and the conical sealing ring by the pumping assembly, and under the action of water pressure, the clogged urea injection pipe is cleaned until the urea injection pipe is completely open, and the pumping assembly stops working.

[0032] Compared with the prior art, the beneficial effects of the present application are:

[0033] 1、The present application can adjust the open state of the first through hole when urea is crystallized and the first through hole is blocked, to prevent urea from not being able to be normally discharged, causing damage to the vehicle. When the conveying assembly conveys urea, the urea will be discharged through the first through hole. If the first through hole is blocked, the open control mechanism will work, so that the amount of the first through hole is increased, to ensure that the urea can be smoothly discharged, not relying entirely on the engine coolant circulation to melt and dredge, and truly realizing the effect of dredging.

[0034] 2、The present application controls the urea injection pipe to move to the position of abutting against the conical sealing ring before cleaning the urea injection pipe, to ensure that hot water can smoothly enter the urea injection pipe. When the urea injection pipe needs to be cleaned, the clamping positioning mechanism is controlled to move under the action of the spacing control assembly, to control the clamping plate to move towards each other. When the clamping plate abuts against the surface of the urea injection pipe, the urea injection pipe is controlled to move towards the conical sealing ring, until the urea injection pipe is tightly abutted against the conical sealing ring. At this time, hot water is pumped into the urea injection pipe under the action of the pumping assembly. Since the clamping positioning mechanism can provide the force for the urea injection pipe to move towards the supporting disc through the clamping plate, the problem that the urea injection pipe is separated from the conical sealing ring due to water flow impact can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Structure schematic view of one embodiment of the urea injection pipe structure.

[0036] Figure 2 Structure schematic view of another angle in one embodiment of the urea injection pipe structure.

[0037] Figure 3 Sectional structure schematic view of the conveying pipe in one embodiment of the urea injection pipe structure.

[0038] Figure 4 Connection relationship schematic view of the conveying assembly and the open control mechanism in one embodiment of the urea injection pipe structure.

[0039] Figure 5 Exploded structure schematic view of the conveying assembly and the open control mechanism in one embodiment of the urea injection pipe structure.

[0040] Figure 6 Structure schematic view of one embodiment of the cleaning device.

[0041] Figure 7 Structure diagram of another angle of an embodiment of the cleaning device.

[0042] Figure 8 Structure diagram of another angle of an embodiment of the cleaning device. Figure 7 Structure diagram of another angle of an embodiment of the cleaning device.

[0043] Figure 9 Structure diagram of another angle of an embodiment of the cleaning device.

[0044] Figure 10 Structure diagram of another angle of an embodiment of the cleaning device.

[0045] Figure 11 Structure diagram of another angle of an embodiment of the cleaning device.

[0046] Figure 12 Structure diagram of another angle of an embodiment of the cleaning device.

[0047] In the figure: 1, connecting valve; 2, electromagnetic plug; 3, flow guide pipe; 4, conveying pipe; 5, fixed disc; 501, first guide hole; 6, rotating disc; 601, second guide hole; 7, support rod; 701, helical groove; 8, support sleeve; 801, limiting block; 9, first spring; 10, sealing disc; 1001, conveying hole; 11, corrugated pipe; 12, water tank; 13, protection box; 14, water pump; 15, absorption pipe; 16, discharge pipe; 17, hollow pipe; 18, support disc; 1801, sliding groove; 19, sliding block; 20, air cylinder; 21, movable sleeve; 22, connecting rod; 23, conical sealing ring; 24, movable plate; 25, first hinged rod; 26, second hinged rod; 27, clamping plate; 28, hinged sleeve; 2801, clamping groove; 29, movable rod; 2901, protrusion; 30, second spring. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] In addition, elements in the application can be referred to as "fixed" or "set" on another element, which can be directly on another element or can exist with a middle element. When an element is considered "connected" to another element, it can be directly connected to another element or can exist with a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0050] Referring to Figures 1-12 In an embodiment of the application, a urea injection pipe structure includes a connection valve 1, an electromagnetic plug-in part 2, a flow guide pipe 3, a delivery pipe 4, a fixed disc 5, a first conduction hole 501, a delivery assembly, and a conduction control mechanism. Since urea may crystallize during delivery, the first conduction hole 501 will be blocked when crystallization occurs, resulting in an increase in pressure in the delivery pipe 4. In order to prevent urea from not being able to be normally discharged, resulting in damage to the vehicle, it is necessary to adjust the conduction state of the first conduction hole 501. When the delivery assembly delivers urea, the urea will be discharged through the first conduction hole 501. If the first conduction hole 501 is blocked, the conduction control mechanism will work, so that the conduction amount of the first conduction hole 501 is increased, to ensure that urea can be smoothly discharged.

[0051] Specifically, it includes:

[0052] The connection valve 1 and the electromagnetic plug-in part 2 installed on the connection valve 1 are provided with a flow guide pipe 3 and a delivery pipe 4 on both sides of the connection valve 1.

[0053] It also includes:

[0054] Referring to Figures 1-5 The fixed disc 5 is installed at the end of the delivery pipe 4, and a plurality of first conduction holes 501 are circumferentially and equidistantly distributed on the fixed disc 5. A delivery assembly is arranged in the delivery pipe 4 and cooperates with the first conduction holes 501, for discharging urea in the delivery pipe 4 through the first conduction holes 501. The delivery assembly includes a sealing disc 10 slidingly installed in the delivery pipe 4, a plurality of delivery holes 1001 are circumferentially and equidistantly distributed on the sealing disc 10, a corrugated pipe 11 is fixedly connected to the fixed disc 5 and arranged on the sealing disc 10, and the corrugated pipe 11 cooperates with the delivery holes 1001 and the first conduction holes 501.

[0055] In detail, the main purpose of adding urea into the automobile is to reduce the emission of harmful gas, to reach the environmental protection emission standard, and to optimize the engine performance and fuel consumption. The main function of adding urea into the automobile is to reduce the emission of nitrogen oxides by the reaction between urea and nitrogen oxides in the exhaust gas, and to optimize the engine performance and fuel consumption. In the initial state, under the action of the control mechanism, the sealing disc 10 is located at the end of the stroke towards the connecting valve 1, and the first through hole 501 has the minimum through capacity. When urea needs to be sprayed, the urea will enter the delivery pipe 4 through the flow guide pipe 3 and the connecting valve 1, and then enter the corrugated pipe 11 through the delivery hole 1001 opened on the sealing disc 10. The corrugated pipe 11 will spray the urea to the required position through the first through hole 501 and the control mechanism.

[0056] Preferably, as the amount of urea delivery increases, the possibility of urea crystallization increases, which will reduce the through capacity of the first through hole 501. At this time, the pressure in the delivery pipe 4 increases, and under the action of the pressure, the thrust on the sealing disc 10 increases, so as to control the movement of the sealing disc 10 towards the fixed disc 5. The corrugated pipe 11 will shrink, and the sealing disc 10 will also drive the control mechanism to move, so as to increase the through capacity of the first through hole 501 to ensure the smooth release of urea.

[0057] When the injection pipe is working normally, the through capacity of the first through hole 501 is small under the action of the control mechanism, so as to facilitate the spraying of urea solution and form smaller droplets. These droplets are more likely to mix with oxygen in the exhaust gas, thereby improving the reduction efficiency of nitrogen oxides. Therefore, the through size of the first through hole 501 cannot be too large

[0058] Please refer to Figures 3-5 The control mechanism is arranged on the fixed disc 5 and connected with the delivery assembly. The control mechanism can act when the delivery assembly moves and adjust the through state of the first through hole 501. The control mechanism comprises a support sleeve 8 mounted on the sealing disc 10. A support rod 7 is slidably arranged in the support sleeve 8 and rotationally connected with the fixed disc 5. A rotating disc 6 is arranged on one end of the support rod 7 away from the support sleeve 8. A second through hole 601 is arranged on the rotating disc 6 and matched with the first through hole 501. An elastic assembly is arranged on the support sleeve 8. The elastic assembly comprises a helical groove 701 arranged on the support rod 7. A limiting block 801 is arranged on the inner wall of the support sleeve 8 and slidably connected with the helical groove 701. A first spring 9 is arranged on the support sleeve 8 and the support rod 7, and the two ends of the first spring 9 abut against the sealing disc 10 and the fixed disc 5, respectively.

[0059] It should be noted that in the initial state, the first spring 9 is in a compressed state, so that the sealing disc 10 is located at the end of the stroke away from the fixed disc 5, the limiting block 801 is located at the end of the stroke on one side of the spiral groove 701, and the second through hole 601 provided on the rotating disc 6 is in the smallest size of mutual communication with the first through hole 501 under the action of the supporting rod 7. With the increase of the urea delivery amount, the urea crystallization formed on the through hole increases, resulting in the decrease of the communication size of the through hole. Therefore, the pressure in the delivery pipe 4 increases, and under the action of the pressure, the sealing disc 10 moves towards the fixed disc 5, the sealing disc 10 also drives the supporting sleeve 8 to slide along the supporting rod 7, and the limiting block 801 slides along the track of the spiral groove 701. Under the action of the limiting block 801 and the spiral groove 701, the supporting rod 7 rotates by a certain angle, and the supporting rod 7 also drives the rotating disc 6 to rotate, so as to increase the communication size of the second through hole 601 and the first through hole 501. Therefore, under the condition that the urea delivery amount in the delivery pipe 4 is unchanged, the normal spraying of urea can be ensured.

[0060] Preferably, if the urea continues to crystallize, it will cause the blocking amount of the through hole to increase. If the blocking size of the through hole is too large, the urea injection pipe needs to be cleaned. At this time, the urea injection pipe can be disassembled from the vehicle body, and the urea injection pipe can be cleaned by warm water.

[0061] A cleaning device, comprising:

[0062] A water tank 12 and a protection box 13 mounted on the water tank 12;

[0063] Please refer to Figure 6 、 Figure 7 、 Figure 9 A supporting disc 18 mounted on the water tank 12, the supporting disc 18 is provided with a conical sealing ring 23, the protection box 13 is provided with a pumping assembly connected with the supporting disc 18, the pumping assembly comprises a water pump 14 mounted in the protection box 13, the water pump 14 is connected with an absorption pipe 15 and a discharge pipe 16, the absorption pipe 15 is connected with the water tank 12, and the discharge pipe 16 penetrates through the protection box 13; further comprising a hollow pipe 17 mounted on the outer wall of the protection box 13, the hollow pipe 17 is connected with the discharge pipe 16 and fixedly connected with the supporting disc 18.

[0064] Further, during the operation of the vehicle, due to the special nature of the urea solution, urea crystallization will occur in the urea pipeline and the urea injection pipe. When the crystallization is serious, the urea pipeline or the urea injection pipe will be blocked, resulting in excessive emission, limited engine power and other phenomena. Therefore, the urea injection pipe needs to be disassembled and the crystallized urea needs to be cleaned.

[0065] Specific, the existing cleaning equipment for urea injection pipe cleaning, usually is the urea injection pipe nozzle inserted into hot water, and in the water shake urea injection pipe, to increase the solution rate of urea crystallization, and this way in the urea injection pipe processing, since only the end of the urea injection pipe cleaning, urea injection pipe internal pipeline can not be cleaned, may lead to urea crystallization residual in the urea injection pipe, and handheld urea injection pipe in hot water in the treatment of crystallization, may make water splash into the electromagnetic plug 2, resulting in urea injection pipe damage problem, and using the present application for urea injection pipe cleaning, then will not appear above situation, specific operation as follows, water tank 12 is provided with water, and water tank 12 is also provided with resistance heater, because the cleaning of urea crystallization needs to be through a certain temperature of hot water, therefore, in the urea injection pipe cleaning, resistance heater work, and the water in water tank 12 is heated, when heating is completed, can be fixed by clamping positioning mechanism of the urea injection pipe needs to be cleaned, and make the inlet of urea injection pipe and taper sealing ring 23 fit, under the action of taper sealing ring 23, can ensure the delivery of hot water into the urea injection pipe, at this time, water pump 14 work, and through the suction pipe 15 water tank 12 hot water is delivered to the discharge pipe 16, the hot water in discharge pipe 16 will be through hollow pipe 17 delivery to the urea injection pipe, when the hot water into the urea injection pipe, under the action of hot water, can be dissolved in the delivery pipe 4, flow guide pipe 3 of urea crystallization, when the hot water through the delivery hole 1001 into the corrugated pipe 11, and impact in the through hole, also can be dissolved in the corrugated pipe 11 and the through hole of the crystallization formed in the through hole, at the same time, because the crystallization in the through hole will block the through hole, the water pressure in the delivery pipe 4 increases, so that the through hole of the through hole increases, therefore, the impact force of hot water on the crystallization in the through hole increases, to further remove the effect of crystallization.

[0066] Please refer to Figures 6-11, clamping positioning mechanism is arranged on the support disc 18, a plurality of clamping plates 27 are connected to the clamping positioning mechanism in a circumferential equidistant distribution, the clamping positioning mechanism comprises a plurality of sliding grooves 1801 which are opened on the support disc 18 and are distributed in a circumferential equidistant distribution, a sliding block 19 is slidably installed in the sliding groove 1801, a movable plate 24 is arranged on the sliding block 19, a first hinged rod 25 and a second hinged rod 26 are hinged to the movable plate 24, the first hinged rod 25 and the second hinged rod 26 are hinged to the clamping plate 27, a supporting assembly connected with the second hinged rod 26 is arranged on the movable plate 24, wherein the supporting assembly comprises a hinged sleeve 28 hinged to the movable plate 24, a movable rod 29 is slidably installed in the hinged sleeve 28, a second spring 30 is sleeved on the hinged sleeve 28 and the movable rod 29; further comprising a clamping groove 2801 opened on the hinged sleeve 28, a protrusion 2901 is arranged on the movable rod 29 and is slidably connected with the clamping groove 2801.

[0067] Further, when cleaning the urea injection pipe, hot water needs to be poured into the urea injection pipe, therefore, the flow guide pipe 3 of the urea injection pipe needs to be in sealing contact with the conical sealing ring 23 to prevent the hot water transported by the hollow pipe 17 from overflowing. Since the first hinge rod 25 and the second hinge rod 26 are arranged in parallel and equal, according to the parallelogram law, the clamping plate 27 and the movable plate 24 are in parallel, and the movable plate 24 is in a horizontal state, so the clamping plate 27 is also in a horizontal state. In the initial state, the second spring 30 is in a compressed state, so that the movable rod 29 is at the end of the stroke away from the hinge sleeve 28, and the protrusion 2901 is at the end of the stroke on one side of the clamping groove 2801. Under the action of the movable rod 29, the included angle between the second hinge rod 26 and the movable plate 24 is maximum, and the spacing between the clamping plate 27 and the movable plate 24 is maximum. Under the action of the spacing regulating assembly, the sliding block 19 is at the end of the stroke on one side of the sliding groove 1801, so that the spacing between the sliding blocks 19 is maximum. Under the action of the sliding block 19, the spacing between the clamping plates 27 is controlled to be maximum by the movable plate 24. When the urea injection pipe needs to be cleaned, the urea injection pipe can be placed on one of the clamping plates 27, and the urea injection pipe is in a separated state with the conical sealing ring 23. At this time, the spacing regulating assembly moves and drives the sliding block 19 to move along the length direction of the sliding groove 1801 and towards the hollow pipe 17. The sliding block 19 also drives the movable plate 24 to move to control the clamping plate 27 to move towards each other by the hinge rod. Under the action of the second spring 30, the spacing between the clamping plate 27 and the movable plate 24 is unchanged. When all the clamping plates 27 move to the position of abutting the surface of the urea injection pipe, the urea injection pipe will move to the same axis position as the conical sealing ring 23. The movable plate 24 continues to move, so that the hinge rod deflects towards the movable plate 24 and drives the clamping plate 27 to move towards the support disc 18. Under the action of the clamping plate 27, the urea injection pipe is driven to move towards the support disc 18. The hinge rod also drives the movable rod 29 to move into the hinge sleeve 28 and controls the protrusion 2901 to move along the length direction of the clamping groove 2801 to compress the second spring 30. When the urea injection pipe moves to closely abut the conical sealing ring 23, the periphery of the urea injection pipe is in a sealed state under the action of the conical sealing ring 23, so that the hot water transported by the hollow pipe 17 can be completely transported into the urea injection pipe.

[0068] Preferably, the conical sealing ring 23 is conically arranged to seal the end of the urea injection pipe. Since the conical sealing ring 23 has a large size, it can seal the urea injection pipe when cleaning the urea injection pipe of different sizes. When the clamping plate 27 fixes the urea injection pipe on the conical sealing ring 23, the clamping plate 27 can also provide a pushing force to the urea injection pipe in the direction of the conical sealing ring 23. When hot water is delivered to the urea injection pipe, the urea injection pipe can be prevented from moving away from the support disc 18 due to the blockage of the through hole, thereby ensuring that the urea injection pipe is fully cleaned. The cleaned hot water will be discharged through the through hole, and a conduit can be connected to the hot water discharge to collect the cleaned water.

[0069] Please refer to Figure 6 、 Figure 7 、 Figure 9 、 Figure 12 , the protective box 13 is provided with a spacing control assembly connected with the clamping and positioning mechanism. The spacing control assembly can adjust the spacing between the clamping plates 27 through the clamping and positioning mechanism to control the movement of the urea injection pipe to the cooperating position with the conical sealing ring 23. The spacing control assembly includes a movable sleeve 21 slidingly installed on the hollow pipe 17, and a connecting rod 22 hinged to the sliding block 19 is hinged to the movable sleeve 21. The protective box 13 is provided with a cylinder 20 fixedly connected with the movable sleeve 21.

[0070] In detail, in the initial state, the movable sleeve 21 is located at the end of the stroke away from the protective box 13 under the action of the cylinder 20, and the sliding block 19 is controlled to be located at the end of the stroke away from each other through the connecting rod 22. When the urea injection pipe needs to be cleaned, the movable sleeve 21 is pushed to move towards the protective box 13 under the action of the cylinder 20, and the movable sleeve 21 also drives the connecting rod 22 to move to control the sliding block 19 to move towards each other. The sliding block 19 also controls the movement of the clamping plate 27. When the clamping plate 27 drives the urea injection pipe to move to closely contact with the conical sealing ring 23, the cylinder 20 stops moving. At this time, the urea injection pipe can be cleaned.

[0071] A cleaning method for a urea injection pipe structure, comprising the following steps:

[0072] Step one: placing the urea injection pipe to be cleaned between the clamping plates 27;

[0073] Step two: under the action of the distance regulating assembly, the plurality of clamping plates 27 are controlled to move towards each other by the clamping positioning mechanism, when the clamping plates 27 move to the position of being attached to the surface of the urea injection pipe, the urea injection pipe is controlled to move to the position of the central axis of the conical sealing ring 23 and move towards the conical sealing ring 23 under the action of the clamping positioning mechanism;

[0074] Step three: when the urea injection pipe moves to the position of being attached to the conical sealing ring 23, the urea injection pipe is ensured not to be separated from the conical sealing ring 23 under the action of the clamping plates 27;

[0075] Step four: at this time, the hot water in the water tank 12 can be delivered to the urea injection pipe through the support disc 18 and the conical sealing ring 23 by the pumping assembly, and the clogged urea injection pipe is cleaned under the action of water pressure until the urea injection pipe is completely open and the pumping assembly stops working.

[0076] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims to which they relate.

[0077] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A urea injection pipe structure, comprising: a connecting valve (1), and an electromagnetic plug-in part (2) mounted on the connecting valve (1), the connecting valve (1) being provided with a flow guide pipe (3) and a delivery pipe (4) on both sides respectively; characterized in that it further comprises: a fixing disc (5) mounted at the end of the delivery pipe (4), the fixing disc (5) being provided with a plurality of first through holes (501) distributed at equal intervals in a circle, and the delivery pipe (4) being provided with a delivery assembly matched with the first through holes (501) for discharging urea in the delivery pipe (4) through the first through holes (501); a through hole regulating mechanism arranged on the fixing disc (5) and connected with the delivery assembly, the through hole regulating mechanism being capable of acting when the delivery assembly moves and adjusting the through state of the first through holes (501); the delivery assembly comprising a sealing disc (10) slidingly mounted in the delivery pipe (4), the sealing disc (10) being provided with a plurality of delivery holes (1001) distributed at equal intervals in a circle, and the sealing disc (10) being provided with a bellows (11) fixedly connected with the fixing disc (5), the bellows (11) being matched with the delivery holes (1001) and the first through holes (501); the through hole regulating mechanism comprising a support sleeve (8) mounted on the sealing disc (10), the support sleeve (8) being slidingly mounted therein with a support rod (7) rotationally connected with the fixing disc (5), one end of the support rod (7) away from the support sleeve (8) being provided with a rotating disc (6), the rotating disc (6) being provided with second through holes (601) matched with the first through holes (501), and the support sleeve (8) being provided with an elastic assembly; the elastic assembly comprising a helical groove (701) formed on the support rod (7), the inner wall of the support sleeve (8) being provided with a limiting block (801) slidingly connected with the helical groove (701), the support sleeve (8) and the support rod (7) being sleeved with a first spring (9), and both ends of the first spring (9) being abutted with the sealing disc (10) and the fixing disc (5) respectively.

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