Automatic coal slurry sampling device

Abstract

The utility model relates to the field of coal slurry sampling devices, in particular to an automatic coal slurry sampling device, which is mounted at a sampling port of a coal slurry pipeline through a pipeline flange and comprises a valve body, a buffer tank, a sampling cylinder and a control unit, two ends of the valve body are respectively fixed with the pipeline flange and the sampling cylinder, a valve rod is arranged in the valve body, and the control unit is connected with the buffer tank. One end of the valve rod is connected with a valve cone for opening or closing the sampling port, the other end of the valve rod penetrates through the valve body and extends into the sampling cylinder to be connected with a piston, the lower side of the valve body is provided with an inclined channel communicated with the buffer tank, and the control unit controls the piston in the sampling cylinder to move and drives the valve rod and the valve cone to be away from the sampling port, so that the sampling port is communicated with the buffer tank. According to the utility model, coal slurry can be automatically sampled, residual coal slurry in the inner cavity of the valve body can be pushed back to a coal slurry pipeline, a sampling port is effectively prevented from being blocked, and the coal slurry in the inner cavity of the valve body and the inner cavity of a pipeline flange is prevented from being deposited; and through the design of the inclined channel, the flow speed of coal slurry entering the buffer tank is reduced.

Description

Technical Field

[0001] The utility model relates to the field of coal slurry sampling devices, in particular to an automatic coal slurry sampling device. Background Art

[0002] As the source process of coal chemical industry, water coal slurry gasification requires the detection of coal slurry quality for safe production. Therefore, coal slurry sampling has become an essential operation in daily safe production, and its safety is self-evident.

[0003] The traditional method of coal slurry sampling is to directly discharge coal slurry from the pipeline sampling port. Its disadvantage is that the coal slurry at the sampling port is prone to splashing and spilling, causing environmental damage or personal injury. In response to this phenomenon, spiral samplers and integrated samplers are often used in the prior art. Although both can reduce the splashing of sampled coal slurry, it is found in the use process that the spiral sampler will cause wear on the density of the spiral groove and blockage of the channel due to poor fluidity and high solid content of the coal slurry, resulting in the inability to sample; although the integrated sampler adopts the principle of a buffer tank, the sampling port will still be blocked, and the sampling process needs to be manually operated, with low automation level, and the flow rate of the coal slurry entering the buffer tank is very high, and the discharge is prone to splashing, and even the sampling flow rate of the coal slurry cannot be accurately controlled.

[0004] Therefore, there is an urgent need to design a sampling device with high automation level and avoiding sampling port blockage. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an automatic coal slurry sampling device. The control unit controls the movement of the piston in the sampling cylinder to realize the automatic control of the opening and closing of the device. After sampling is completed, it can control the piston to drive the valve cone to move, push the residual coal slurry in the valve cavity back into the coal slurry pipeline, effectively avoid the blockage of the sampling port, and prevent the deposition of coal slurry in the valve cavity and the inner cavity of the pipeline flange; and through the design of the inclined channel, the flow rate of the coal slurry entering the buffer tank can be reduced, splashing can be prevented, and the purpose of pressure reduction and speed reduction can be achieved.

[0006] To solve the above technical problems, the present utility model provides an automatic coal slurry sampling device. The device is installed at the sampling port of the coal slurry pipeline through a pipeline flange. The device includes a valve body, a buffer tank, a sampling cylinder and a control unit. The two ends of the valve body are respectively fixed to the pipeline flange and the sampling cylinder. The inner cavity of the valve body is communicated with the inner cavity of the pipeline flange. A valve rod is provided in the valve body. One end of the valve rod is connected with a valve cone for opening or closing the sampling port, and the other end passes through the valve body and extends into the sampling cylinder to be connected with a piston. The valve cone is slidably connected between the pipeline flange and the inner cavity of the valve body. The buffer tank is located below the valve body. An inclined channel communicating with the buffer tank is opened on the lower side of the valve body. The control unit controls the piston in the sampling cylinder to move and drives the valve rod and the valve cone away from the sampling port, so that the sampling port is communicated with the buffer tank.

[0007] Further, the angle between the inclined channel and the central axis of the buffer tank is 30° - 65°. And the upper end of the inclined channel is close to the pipeline flange. The top of the buffer tank is provided with a feed port, and the feed port has the same inner diameter as the inclined channel and the inner diameter size range is 25 - 50 mm.

[0008] Further, the two ends of the valve body are respectively provided with a flange one and a flange two. The flange one is fixedly connected with the pipeline flange and a sealing member is provided therebetween. The flange two is fixedly connected with the sampling cylinder. The outer side of the upper end of the buffer tank is provided with a flange four. The outer side of the lower end of the inclined channel is provided with a flange three. The flange three is fixedly connected with the flange four.

[0009] Further, the valve cone is in clearance fit with both the pipeline flange and the inner cavity of the valve body. A conical protrusion is provided on the inner wall of the pipeline flange near the sampling port. The valve cone is provided with a conical surface for mating with the protrusion.

[0010] Further, the sampling cylinder includes a housing, an end cover and a spring. The end cover is arranged on the right side of the housing and is fixedly connected with the flange two through a pull rod. The inner cavity of the housing is divided into a left chamber and a right chamber by the piston. One side of the left chamber is communicated with an intake pipeline. A control valve controlled by the control unit is provided on the intake pipeline. The spring is arranged in the right chamber, and one end thereof is connected with the piston and the other end is connected with a backing plate.

[0011] Further, the control valve is a two-position three-way control valve. The intake end of the two-position three-way control valve is connected with a gas source, the outlet end is connected with the intake pipeline, and the exhaust end is connected with an exhaust muffler.

[0012] Further, a spring adjustment assembly is provided on the end cap. The spring adjustment assembly includes a knob and an adjustment rod. One end of the adjustment rod is fixedly connected to the knob, and the other end passes through the end cap and extends into the housing to be connected to the backing plate. The adjustment rod is threadedly connected to the end cap.

[0013] Further, a limiting block for limiting the movement of the piston is provided in the inner cavity of the housing. A packing gland and packing are sequentially arranged between the housing and the valve stem from left to right. The packing gland abuts against the end of the second flange.

[0014] Further, a first flushing port is provided on the valve body. The first flushing port is connected to a first flushing pipeline. A first solenoid valve is provided on the first flushing pipeline. A second flushing port is opened on the side wall of the buffer tank. The second flushing port is connected to a second flushing pipeline. The second flushing pipeline is tangent to the inner wall of the buffer tank. A second solenoid valve is provided on the second flushing pipeline.

[0015] Further, a discharge port is provided at the bottom of the buffer tank. A sampling container is provided below the discharge port. A liquid level detector for detecting the liquid in the sampling container is provided on the outer wall of the lower end of the buffer tank. The liquid level detector is signal-connected to the control unit.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. The coal slurry automatic sampling device of the present utility model can realize automatic sampling of coal slurry, reduce the labor intensity of workers, control the movement of the piston in the sampling cylinder through the control unit, realize the automatic control of the opening and closing of the device, and after the sampling is completed, can control the piston to drive the valve cone to move, push the residual coal slurry in the inner cavity of the valve body back into the coal slurry pipeline, effectively avoid the blockage of the sampling port, and prevent the deposition of coal slurry in the inner cavity of the valve body and the inner cavity of the pipeline flange; and through the design of the inclined channel, the flow rate of the coal slurry entering the buffer tank can be reduced, prevent the coal slurry from splashing, make the coal slurry pipeline have no pressure loss fluctuation, the sampling concentration is not interfered, and the purpose of reducing pressure and speed, improving the safety operation conditions is achieved;

[0018] 2. The present utility model designs the angle between the inclined channel and the central axis of the buffer tank to be 30°-65°, reducing the flow rate of the coal slurry entering the buffer tank; and by arranging the upper end of the inclined channel close to the pipeline flange, the coal slurry can flow out through the inclined channel in time, reducing the horizontal travel of the coal slurry in the valve body, preventing the accumulation of coal slurry in the valve body, and avoiding the phenomenon of coal slurry blockage at the sampling port;

[0019] 3. The present utility model is provided with a conical protrusion on the inner wall of the pipeline flange near the sampling port, and the valve cone is provided with a conical surface matching with the protrusion, so that the valve cone can be kept sealed with the protrusion under the thrust of the piston, preventing coal slurry leakage. Compared with the gasket seal in the prior art, it can effectively prevent the wear and failure of the sealing gasket;

[0020] 4. Through the design of the spring, the utility model can not only assist the piston to move quickly when the piston moves to the left chamber, push the coal slurry in the inner cavity of the valve back into the coal slurry pipeline, and close the sampling port, but also achieve fail-safe protection. For example, when the valve loses the air source or is misoperated, the piston can be closed in time under the action of the spring to prevent the coal slurry from overflowing and ensure the normal operation of the system at the same time.

[0021] 5. Through the design of the spring adjustment component, the valve cone is pressed against the sampling port by adjusting the spring tension, which can prevent the sampling port from not closing properly and improve the sealing effect at the sampling port. Specifically, by rotating the knob to drive the adjusting rod and the backing plate to move left or right, the purpose of adjusting the spring force can be achieved. For example, by increasing the compression amount of the spring, the spring force can be increased, so that the valve closing time is shortened, the pressing degree of the valve cone is increased, and the sealing effect at the sampling port is better.

[0022] 6. Through the design of the first flushing port and the second flushing port, the utility model can realize the internal cleaning of the device. And the second flushing port is connected with a second flushing pipeline. The design that the second flushing pipeline is tangent to the inner wall of the buffer tank can make the cleaning liquid rotate along the tank wall of the buffer tank during cleaning, and wash the entire tank wall of the buffer tank as much as possible, improving the flushing efficiency.

[0023] 7. Through the design of the liquid level detector, the utility model can flexibly and accurately adjust the size of the coal slurry sampling flow. The whole sampling process is simple to operate and has a high automation level. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of the coal slurry automatic sampling device of Embodiment 1 of the present utility model;

[0026] Figure 2 is Figure 1 an enlarged view of area A in

[0027] Figure 3 is a top view of the buffer tank of the coal slurry automatic sampling device of the present utility model;

[0028] In the figure: 101 - pipeline flange, 1011 - protrusion, 100 - coal slurry pipeline, 1 - valve body, 2 - buffer tank, 3 - sampling cylinder, 4 - packing gland, 5 - packing, 6 - sampling container, 7 - liquid level detector, 8 - central controller, 11 - flange one, 12 - flange two, 13 - valve stem, 14 - valve cone, 15 - inclined channel, 151 - open end, 152 - flange three, 16 - flushing port one, 161 - solenoid valve one, 21 - feed port, 211 - flange four, 212 - flushing port two, 2121 - solenoid valve two, 22 - discharge port, 31 - piston, 32 - housing, 321 - left chamber, 322 - right chamber, 323 - limit block, 33 - end cover, 34 - spring, 35 - pull rod, 36 - intake pipeline, 37 - backing plate, 38 - two-position three-way control valve, 39 - exhaust muffler, 310 - spring adjustment assembly, 3101 - knob, 3102 - adjusting rod. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] As Figures 1-3 shown, a coal slurry automatic sampling device is installed at the sampling port of the coal slurry pipeline 100 through the pipeline flange 101. The device includes a valve body 1, a buffer tank 2, a sampling cylinder 3 and a control unit 8. The two ends of the valve body 1 are respectively fixed to the pipeline flange 101 and the sampling cylinder 3. The inner cavity of the valve body 1 is communicated with the inner cavity of the pipeline flange 101. A valve stem 13 is provided in the valve body 1. One end of the valve stem 13 is connected with a valve cone 14 for opening or closing the sampling port, and the other end passes through the valve body 1 and extends into the sampling cylinder 3 to be connected with a piston 31. The valve cone 14 is slidably connected between the pipeline flange 101 and the inner cavity of the valve body 1. The buffer tank 2 is located below the valve body 1. An inclined channel 15 communicating with the buffer tank 2 is opened on the lower side of the valve body 1. The control unit 8 controls the movement of the piston 31 in the sampling cylinder 3 and drives the valve stem 13 and the valve cone 14 away from the sampling port, so that the sampling port is communicated with the buffer tank 2.

[0032] Through the above design, the automatic coal slurry sampling device of the utility model can realize automatic coal slurry sampling, reduce the manual labor intensity, control the movement of the piston 31 in the sampling cylinder 3 through the control unit 8 to realize the automatic control of the opening and closing of the device, and after the sampling is completed, it can control the piston 31 to drive the valve cone 14 to move, push the residual coal slurry in the inner cavity of the valve body 1 back into the coal slurry pipeline 100, effectively prevent the coal slurry in the inner cavity of the valve body 1 and the inner cavity of the pipeline flange 101 from depositing, and avoid the phenomenon of sampling port blockage; and through the design of the inclined channel 15, the flow rate of the coal slurry entering the buffer tank 2 can be reduced, so that there is no pressure loss fluctuation in the coal slurry pipeline, the sampling concentration is not interfered, the coal slurry splashing is prevented, and the purpose of reducing pressure and speed and improving the safe operation conditions is achieved.

[0033] In this embodiment, a discharge port 22 is provided at the bottom of the buffer tank 2. The inner diameter of the discharge port is smaller than that of the feed port, which can reduce the flow rate of the coal slurry. A sampling container 6 is provided below the discharge port 22. A liquid level detector 7 for detecting the liquid in the sampling container 6 is provided on the outer wall of the lower end of the buffer tank 2. The liquid level detector 7 is signal-connected to the control unit 8. When the control unit 8 receives the signal transmitted by the liquid level detector 7, it will issue an instruction to control the opening and closing state of the corresponding control valve, so as to realize the regulation of the coal slurry flow rate.

[0034] In this embodiment, the control unit 8 is a central controller, specifically including a time timer, a data arithmetic unit and a feedback alarm system. Through the design of the time timer, the sampling valve opening time or the flushing time can be set. When the sampling time arrives, the controller gives an open valve signal to the corresponding valve controller; through the design of the data arithmetic unit, when the liquid level signal reaches a certain data, a closed valve signal is given to the corresponding valve; through the design of the feedback alarm system, when the conditions in the execution process are not met, such as the sampling container 6 is not detected, an alarm signal will be issued and the program operation will be terminated, or the fail-safe mode is triggered during the sampling process, the air source of the sampling cylinder is closed, and the sampling device valve is closed.

[0035] In addition, in this embodiment, the angle between the inclined channel 15 and the central axis of the buffer tank 2 is 30° - 65°. A feed port 21 is provided at the top of the buffer tank 2. The feed port 21 has the same inner diameter as the inclined channel 15 and the inner diameter size range is 25 - 50 mm; here, the coal slurry can enter the buffer tank 2 at an angle of 30° - 65°, reducing the flow rate of the coal slurry entering the buffer tank 2; in this embodiment, the upper end 151 of the inclined channel 15 is close to the pipeline flange 101, which can enable the coal slurry to flow out through the inclined channel 15 in time, reduce the horizontal travel of the coal slurry in the valve body 1, prevent the coal slurry from accumulating in the valve body 1, and avoid the phenomenon of coal slurry blockage at the sampling port.

[0036] Such as Figure 1As shown, in this embodiment, the lower end of the buffer tank 2 is in an inverted cone structure, and the height of the straight section at the upper end is 1 - 1.5 times the diameter of the tank body. This design can reduce the flow rate of the coal slurry in the buffer tank 2, prevent splashing and personal injury. Specifically, the diameter of the buffer tank 2 is designed to be 1.5 - 2 times the diameter of the coal slurry pipeline 100.

[0037] Specifically, in this embodiment, flanges 11 and 12 are respectively provided at both ends of the valve body 1. The flange 11 is fixedly connected to the pipeline flange 101 through a stud bolt and a seal is provided therebetween. The flange 12 is fixedly connected to the sampling cylinder 3 through a pull rod. A flange 211 is provided on the outer side of the upper end of the buffer tank 2, and a flange 152 is provided on the outer side of the lower end of the inclined channel 15. The flange 152 is fixedly connected to the flange 211. By adopting the method of corresponding flange mating connection, it is not only beneficial to the maintenance or overhaul of the coal slurry automatic sampling device of the present utility model, but also can minimize the external volume of the device. In this embodiment, the inner diameter of the inner cavity of the valve body 1 is set to be 25 - 50 mm. Among them, the material of the valve body is selected as stainless steel to prevent rusting.

[0038] In this embodiment, there is a clearance fit between the valve cone 14 and the inner cavities of both the pipeline flange 101 and the valve body 1. A conical protrusion 1011 is provided on the inner wall of the pipeline flange 101 near the sampling port, and a conical surface that cooperates with the protrusion 1011 is provided on the valve cone 14. Through the design of the protrusion 1011 and the conical surface, the valve cone 14 can maintain a seal with the protrusion 1011 under the thrust of the piston 31 to prevent coal slurry leakage. Compared with the gasket seal in the prior art, it can effectively prevent the wear and failure of the sealing gasket.

[0039] As Figure 2 shown, the angle between the protrusion and the inner cavity of the valve body is 135°. The height h of the protrusion is 6 - 8 mm. The head of the valve cone has a 135° cone angle, and the diameter of its straight section is matched with the inner cavities of the pipeline flange 101 and the valve body 1. It can not only achieve a tight seal under the thrust of the piston and the spring, but also push the coal slurry entering the inner cavity of the valve body back into the coal slurry pipeline after sampling. The sealing reliability at the sampling port of the present utility model is higher. Here, the material of the valve cone 14 is 45# steel. Among them, both the head material and the outer part of the cone are plated with 304 stainless steel, which can not only meet the passing volume of the sampled coal slurry, but also make the valve seal well, and has high use reliability.

[0040] In addition, in this embodiment, the sampling cylinder 3 includes a housing 32, an end cap 33, and a spring 34. The end cap 33 is arranged on the right side of the housing 32 and fixed to the second flange 12 through a pull rod 35. The inner cavity of the housing 32 is divided into a left chamber and a right chamber by a piston 31. An intake pipeline 36 is communicated with one side of the left chamber. A control valve controlled by the control unit 8 is provided on the intake pipeline 36. The spring 34 is arranged in the right chamber, with one end connected to the piston 31 and the other end connected to a backing plate 37. The design of the spring here can not only assist the piston 31 to move quickly when the piston 31 moves towards the left chamber, push the coal slurry in the valve inner cavity back into the coal slurry pipeline, and close the sampling port, but also achieve fail-safe protection. For example, when the valve loses air supply or is misoperated, the piston can be closed in time under the action of the spring, preventing the coal slurry from overflowing and ensuring the normal operation of the system at the same time.

[0041] Specifically, in this embodiment, the control valve is a two-position three-way control valve 38. The intake end of the two-position three-way control valve 38 is connected to an air source, the outlet end is connected to the intake pipeline 36, and the exhaust end is connected to an exhaust silencer 39. In this embodiment, the air source uses instrument air. Through the design of the two-position three-way control valve 38, the valve position C / D can be switched according to the instruction under the action of the control unit, realizing the automatic control of the opening and closing of the device, such as Figure 1 , when sampling is required, the three-way control valve 38 is controlled to reach position C, the air source is turned on, and the left chamber of the sampling cylinder 3 is inflated, pushing the piston 31 to move to the right, thereby driving the valve cone 14 to move to the right to start sampling; when the sampling is completed, the three-way control valve 38 is controlled to reach position D, the air source is turned off, the left chamber starts to relieve pressure, and the piston 31 drives the valve cone 14 to move to the left under the push of the spring 34 to close the sampling port. Through the design of the exhaust silencer 39 here, the on-site noise can be reduced.

[0042] In addition, a spring adjustment assembly 310 is provided on the end cap 33 in this embodiment. The spring adjustment assembly 310 includes a knob 3101 and an adjustment rod 3102. One end of the adjustment rod 3102 is fixedly connected to the knob 3101, and the other end passes through the end cap 33 and extends into the housing 32 to be connected to the backing plate 37. The adjustment rod 3102 is threadedly connected to the end cap 33; through the design of the spring adjustment assembly, by adjusting the spring tension to press the valve cone against the sampling port, it can prevent the sampling port from not closing properly and improve the sealing effect at the sampling port; specifically, by rotating the knob to drive the adjustment rod and the backing plate to move left or right, the purpose of adjusting the spring force can be achieved. For example, by increasing the compression amount of the spring, the spring force can be increased, shortening the valve closing time, increasing the pressing degree of the valve cone, and making the sealing effect at the sampling port better.

[0043] Specifically, in this embodiment, a limiting block 323 for limiting the movement of the limiting piston 31 is provided in the inner cavity of the housing 32. A packing gland 4 and packing 5 are sequentially arranged between the housing 32 and the valve stem 13 from left to right. The packing gland 4 abuts against the end of the flange two 12. Here, in combination with the fixing method of the pull rod, the reliability and tightness of the sampling cylinder can be ensured, and the air leakage phenomenon can be avoided.

[0044] As Figure 1 and 3 shown, a first flushing port 16 is provided on the valve body 1. A first flushing pipeline is connected to the first flushing port 16. A first electromagnetic valve 161 is provided on the first flushing pipeline. When it is necessary to flush the inner cavity of the valve body, the control unit gives an open valve signal to the first electromagnetic valve 161, and a cleaning agent is introduced into the first flushing port 16 to flush the inner cavity of the valve body; a second flushing port 212 is opened on the side wall of the buffer tank 2. A second flushing pipeline is connected to the second flushing port 212. The second flushing pipeline is tangent to the inner wall of the buffer tank 2. A second electromagnetic valve 2121 is provided on the second flushing pipeline. When it is necessary to flush the buffer tank 2, the control unit gives an open valve signal to the second electromagnetic valve 2121, and the cleaning liquid will rotate along the tank wall, and the entire tank wall of the buffer tank can be flushed clean to the greatest extent, and the flushing efficiency is high.

[0045] The working process of the present utility model is as follows:

[0046] First step: Check and close the first electromagnetic valve 161 and the second electromagnetic valve 2121;

[0047] Second step: Check and open the gas source valve;

[0048] Third step: Check whether the sampling container 6 is in place. If the sampling container 6 is not detected, an alarm signal will be sent to the central controller;

[0049] Fourth step: Set the sampling time on the central controller, and at the same time set the sampling liquid level. Here, the flushing time can be set according to requirements;

[0050] Fifth step: Put it into operation;

[0051] Sixth step: When the sampling time set by the central controller arrives, the central controller transmits an open valve signal to the two-way three-way valve 38. The two-way valve reaches position C, the gas source is connected, the left chamber of the cylinder is inflated, the pressure rises, the piston 31 is pushed to move to the right, and at the same time the valve cone 14 is driven by the valve stem 13 to move to the right, the spring is compressed, the sampling port is opened, and the coal slurry flows out;

[0052] Step 7: When the coal slurry in the sampling container 6 reaches the set position, the sampling liquid level detector receives the signal and transmits it to the central controller 8. The central controller 8 transmits a valve closing signal to the two-way three-way valve 38. The two-way valve reaches position D, and the left chamber of the cylinder starts to relieve pressure. The piston 31 drives the valve cone 14 to move leftward under the push of the spring 34, closing the sampling port. At the same time, the valve cone 14 pushes the coal slurry in the inner cavity of the valve body 1 back into the coal slurry pipeline, keeping the inner cavity of the valve body 1 clean, and one sampling cycle is completed.

[0053] Step 8: When flushing is required or the set flushing time is reached, open solenoid valve 161 and solenoid valve 2121 to flush the valve body 1 and the buffer tank 2 respectively, keeping the device clean.

[0054] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A coal slurry automatic sampling device, the device is installed at the sampling port of a coal slurry pipeline (100) through a pipeline flange (101), characterized in that: The device comprises a valve body (1), a buffer tank (2), a sampling cylinder (3) and a control unit (8); the two ends of the valve body (1) are respectively fixed to the pipeline flange (101) and the sampling cylinder (3); the inner cavity of the valve body (1) is communicated with the inner cavity of the pipeline flange (101); a valve stem (13) is provided in the valve body (1); one end of the valve stem (13) is connected to a valve cone (14) for opening or closing a sampling port, and the other end passes through the valve body (1) and extends into the sampling cylinder (3) to connect to the sampling port. A piston (31) is provided, the valve cone (14) is slidably connected to the inner cavity of the pipeline flange (101) and the valve body (1), the buffer tank (2) is located below the valve body (1), and an oblique channel (15) connected to the buffer tank (2) is provided on the lower side of the valve body (1), and the control unit (8) controls the piston (31) in the sampling cylinder (3) to move and drive the valve stem (13) and the valve cone (14) away from the sampling port, so that the sampling port is connected to the buffer tank (2).

2. The automatic coal slurry sampling device according to claim 1, characterized in that: The angle between the oblique channel (15) and the central axis of the buffer tank (2) is 30° to 65°, and the upper end (151) of the oblique channel (15) is arranged close to the pipeline flange (101). The top of the buffer tank (2) is provided with a feed port (21), and the feed port (21) has the same inner diameter as the oblique channel (15), and the inner diameter size ranges from 25 to 50 mm.

3. The automatic coal slurry sampling device according to claim 1, characterized in that: The two ends of the valve body (1) are respectively provided with flange one (11) and flange two (12); the flange one (11) is fixedly connected to the pipeline flange (101) and a sealing member is provided therebetween; the flange two (12) is fixedly connected to the sampling cylinder (3); the upper end outer side of the buffer tank (2) is provided with flange four (211); the lower end outer side of the oblique channel (15) is provided with flange three (152); the flange three (152) is fixedly connected to the flange four (211).

4. The automatic coal slurry sampling device according to claim 1, characterized in that: The valve cone (14) is clearance-fitted with the pipeline flange (101) and the inner cavity of the valve body (1); a conical protrusion (1011) is provided on the inner wall of the pipeline flange (101) near the sampling port, and a conical surface matching the protrusion (1011) is provided on the valve cone (14).

5. The automatic coal slurry sampling device according to claim 3, characterized in that: The sampling cylinder (3) comprises a shell (32), an end cover (33) and a spring (34); the end cover (33) is arranged on the right side of the shell (32) and is fixed to the flange 2 (12) via a pull rod (35); the inner cavity of the shell (32) is divided into a left chamber and a right chamber via the piston (31); one side of the left chamber is connected to an air intake line (36); a control valve controlled by a control unit (8) is provided on the air intake line (36); the spring (34) is arranged in the right chamber, one end of which is connected to the piston (31) and the other end of which is connected to a pad (37).

6. The automatic coal slurry sampling device according to claim 5, characterized in that: The control valve is a two-position three-way control valve (38), the air inlet end of the two-position three-way control valve (38) is connected to an air source, the air outlet end is connected to the air inlet pipeline (36), and the exhaust end is connected to an exhaust muffler (39).

7. The automatic coal slurry sampling device according to claim 5, characterized in that: The end cover (33) is provided with a spring adjustment assembly (310), and the spring adjustment assembly (310) comprises a knob (3101) and an adjustment rod (3102), one end of the adjustment rod (3102) is fixedly connected to the knob (3101), and the other end of the adjustment rod (3102) passes through the end cover (33) and extends into the housing (32) to be connected to the pad (37), and the adjustment rod (3102) and the end cover (33) are threadedly connected.

8. The automatic coal slurry sampling device according to claim 5, characterized in that: The inner cavity of the housing (32) is provided with a limit block (323) for limiting the movement of the piston (31), and a packing gland (4) and a packing (5) are arranged in sequence from left to right between the housing (32) and the valve stem (13), and the packing gland (4) is in contact with the end of the second flange (12).

9. The automatic coal slurry sampling device according to claim 1, characterized in that: The valve body (1) is provided with a flushing port (16), the flushing port (16) is connected to a flushing pipe (1), the flushing pipe (1) is provided with a solenoid valve (161), the side wall of the buffer tank (2) is provided with a flushing port (212), the flushing port (212) is connected to a flushing pipe (2), the flushing pipe (2) is tangent to the inner wall of the buffer tank (2), and the flushing pipe (2) is provided with a solenoid valve (2121).

10. The coal slurry automatic sampling device according to claim 1, characterized in that: The bottom of the buffer tank (2) is provided with a discharge port (22), a sampling container (6) is provided below the discharge port (22), and a liquid level detector (7) for detecting the liquid in the sampling container (6) is provided on the outer wall of the lower end of the buffer tank (2), and the liquid level detector (7) is connected to the control unit (8) via a signal.

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