Quantitative sampling device for large slurry storage tank

Abstract

The utility model discloses a large-scale slurry storage tank quantitative sampling device which comprises a slurry storage tank, the slurry storage tank is provided with a double-layer stirrer, the double-layer stirrer comprises a central shaft which is longitudinally inserted into the tank, and the central shaft is provided with an upper paddle and a lower paddle; the wall of the slurry storage tank is communicated with a sampling pipe, the sampling pipe comprises a sampling branch pipe and a sampling main pipe which are communicated with each other, the sampling branch pipe is divided into a Y-shaped upper branch pipe, a Y-shaped middle branch pipe and a Y-shaped lower branch pipe, the three branch pipes are parallel to each other and are obliquely arranged relative to the horizontal plane, the inclination angle is 3-10 degrees, and the sampling main pipe is vertically arranged along the outside of the wall of the tank; and the three branch pipes are respectively connected to the sampling main pipe. The three layers of sampling pipes can operate independently or in a combined manner, so that various sampling requirements are met, and the sampling efficiency is high; according to the utility model, instant flushing can be carried out after sampling, so that the problem of valve clamping caused by pipeline blockage is directly avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulp storage tank sampling devices and relates to a quantitative sampling device for a large pulp storage tank. Background Art

[0002] The uniformity and representativeness of sampling determine whether the test results are instructive for production, and directly affect the operation of the production process, product quality and economic benefits. The current common slurry storage tank sampling device is equipped with a short L-shaped tube at the bottom, which is controlled by a manual valve. It has the disadvantages of easy clogging of the sampling tube, valve sticking, and uneven sampling. Especially when storing slurries that are easy to settle in large slurry storage tanks, it is inconvenient to sample from the middle and upper sampling ports, and the uneven concentration in the upper, middle and lower parts of the tank causes uneven sampling. There are also sampling points set on the pipeline after the slurry storage tank discharge pump. Although this solves the problems of uneven sampling and difficult sampling point setting, there are problems such as high pressure in the pipeline after the pump, serious sampling splashing, and pipeline pressure relief. Therefore, there is an urgent need for a device that can simultaneously meet the requirements of quantitative sampling of large slurry storage tanks, easy operation, and easy flushing. Utility Model Content

[0003] The utility model aims to provide a quantitative sampling device for a large pulp storage tank, which solves the problems of cumbersome sampling operation and uneven sampling caused by uneven concentration in the upper, middle and lower parts of the tank in the existing pulp storage tank sampling device.

[0004] The technical solution adopted by the utility model is a large-scale quantitative sampling device for a slurry storage tank, comprising a slurry storage tank, which is provided with a double-layer agitator, the double-layer agitator comprising a central shaft longitudinally inserted into the tank, and an upper blade and a lower blade are provided on the central shaft; a sampling tube is connected to the wall of the slurry storage tank, the sampling tube comprises a sampling branch tube and a sampling main tube that are interconnected, the sampling branch tube is divided into a Y-shaped upper branch tube, a middle branch tube and a lower branch tube, the three branches are parallel to each other and arranged inclined relative to the horizontal plane, the pipe mouth of the sampling branch tube is inclined upward at an angle of 3-10°, the sampling main tube is arranged vertically along the outside of the tank wall, and the three branches are respectively connected to the sampling main tube.

[0005] The utility model is also characterized in that:

[0006] One end of the sampling branch pipe is inserted into the tank body at a distance of 10-20 cm from the central axis, and the other end is connected to the sampling main pipe at an obtuse angle of 93-100 degrees.

[0007] It also includes a flushing pipe, one end of which is connected to a water tank, a flushing water pump is provided on the connecting pipe between the water tank and the flushing pipe, one end of the flushing pipe is connected to a sampling pipe, and the flushing pipe is branched into an upper flushing pipe, a middle flushing pipe and a lower flushing pipe by a main pipe near one end of the sampling pipe, and the upper, middle and lower flushing pipes are respectively connected to the electric sampling valve of the sampling branch pipe.

[0008] The upper branch pipe is 60-80% of the height from the tank bottom, the middle branch pipe is 40-60% of the height from the tank bottom, the middle branch pipe is between the two layers of blades, and the lower branch pipe is 10-20% of the height from the tank bottom.

[0009] One end of the flushing pipe is connected to the water tank and the flushing water pump, and the other end is connected to the sampling pipe. The flushing pipe is branched into upper, middle and lower flushing branches by a main pipe near the end of the sampling pipe, and is respectively connected to the electric valve of the sampling branch pipe;

[0010] The upper sampling branch pipe is 60-80% of the height from the tank bottom, the middle sampling branch pipe is 40-60% of the height from the tank bottom, between the two layers of paddles, and the lower sampling branch pipe is 10-20% of the height from the tank bottom;

[0011] Electric water valves are installed on the upper flushing pipe, middle flushing pipe and lower flushing pipe. The electric sampling valve and electric water valve are centrally controlled by the PLC controller, which can open and close the valves and adjust the valve opening time according to the total sampling volume and flushing needs. It can realize automatic timed flushing after sampling is completed, and can also be flushed before sampling.

[0012] The opening sequence and interval duration of the upper, middle and lower electric sampling valves are centrally controlled by PLC. The specific time needs to be calculated based on the tank height, the height difference and diameter of the upper, middle and lower sampling tubes, and the flow rate of the slurry in the sampling tubes to ensure that the upper, middle and lower sampling volumes are consistent.

[0013] The PLC controller is also connected to the PLC external digital display device, which is installed next to the tank body and can be centrally controlled on site, saving manpower.

[0014] The upper, middle and lower sampling tubes can be sampled and flushed independently, or they can be sampled and flushed together;

[0015] The beneficial effects of the utility model are:

[0016] 1. The sampling tube of the utility model goes deep into the center axis of the tank body, and can obtain the most evenly mixed slurry in the center of the tank body; it can obtain the slurry in the upper, middle and lower layers for mixing, thereby improving the sampling uniformity;

[0017] 2. The opening time difference of the electric sampling valve of the utility model can ensure the consistency of the sampling volume at the top, middle and bottom, thereby improving the representativeness of the sampling;

[0018] 3. The three-layer sampling tube of the utility model can be operated independently or in combination to meet various sampling needs and has high sampling efficiency; and the layered sampling can better adapt to large slurry storage tanks.

[0019] 4. The sampling device of the utility model can realize quantitative sampling and uniform sampling of large slurry storage tanks, is easy to operate and easy to flush, and solves the current problems of easy clogging of sampling tubes, valve sticking, uneven sampling, difficult setting of sampling points, and troublesome operation; it can meet the needs of quantitative sampling.

[0020] 5. The utility model can be flushed immediately after sampling, directly avoiding the valve sticking problem caused by pipeline blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a quantitative sampling device for a large slurry storage tank of the utility model.

[0022] In the figure, 1. slurry storage tank, 2. upper paddle, 3. lower paddle, 4. upper branch pipe, 6. middle branch pipe, 8. lower branch pipe, 10. electric sampling valve, 13. water tank, 14. upper flushing pipe, 15. middle flushing pipe, 16. lower flushing pipe, 17. electric water valve, 18. middle water valve, 19. lower water valve, 20. sampling main pipe, 21. PLC controller, 22. center shaft, 23. water pump. DETAILED DESCRIPTION

[0023] The following is a detailed description of the specific implementation of the utility model in conjunction with the accompanying drawings, so that those skilled in the art can make a large-scale slurry tank quantitative sampling device according to the specific implementation. The specific embodiment is as follows:

[0024] Example 1

[0025] The large-scale slurry storage tank quantitative sampling device of the utility model is as follows: Figure 1 As shown, it includes a slurry storage tank 1, which is provided with a double-layer agitator. The double-layer agitator includes a central shaft 22 longitudinally inserted into the tank, and an upper blade 2 and a lower blade 3 are provided on the central shaft 22; a sampling tube is connected to the tank wall of the slurry storage tank 1, and the sampling tube includes a sampling branch tube and a sampling main tube that are interconnected. The sampling branch tube is divided into a Y-shaped upper branch tube 4, a middle branch tube 6 and a lower branch tube 8. The three branches are parallel to each other and arranged inclined relative to the horizontal plane. The pipe mouth of the sampling branch tube is inclined upward at an angle of 3-10°. The sampling main tube is arranged vertically along the outside of the tank wall, and the three branches are respectively connected to the sampling main tube 20.

[0026] One end of the sampling branch pipe penetrates into the interior of the tank body at a distance of 10-20 cm from the central axis, and the other end is connected to the sampling main pipe 20 at an obtuse angle of 93-100 degrees.

[0027] It also includes a flushing pipe, one end of which is connected to the water tank 13. A flushing water pump 23 is provided on the connecting pipe between the water tank 13 and the flushing pipe. One end of the flushing pipe is connected to the sampling pipe. The flushing pipe is branched into an upper flushing pipe 14, a middle flushing pipe 15 and a lower flushing pipe 16 by a main pipe near one end of the sampling pipe. The upper, middle and lower flushing pipes are respectively connected to the electric sampling valve 10 of the sampling branch pipe.

[0028] The upper branch pipe 4 is 60-80% away from the tank bottom height, the middle branch pipe 6 is 40-60% away from the tank bottom height, the middle branch pipe 6 is between the two layers of blades, and the lower branch pipe is 10-20% away from the tank bottom height.

[0029] Electric water valves 17 are provided on the upper flushing pipe 14 , the middle flushing pipe 15 and the lower flushing pipe 16 ; the PLC controller 21 centrally controls the electric sampling valve 10 and the electric water valve 17 .

[0030] The PLC controller 21 is also connected to a PLC external digital display device, which is installed next to the tank body.

[0031] Example 2

[0032] The utility model relates to a quantitative sampling device for a large-scale slurry storage tank, comprising a stirring system for slurry storage, a sampling system, a flushing system and a control system. The slurry storage stirring system comprises a large-scale slurry storage tank 1, which is internally provided with a double-layer stirrer, which is composed of an upper blade 2, a lower blade 3 and a central shaft 22; the sampling system comprises sampling tubes inside and outside the wall of the slurry storage tank 1, and the sampling tubes are divided into upper, middle and lower sampling branches and a sampling main pipe 20. Each layer of sampling branch pipes inside the wall of the slurry storage tank 1 is Y-shaped, consisting of branch pipe a and branch pipe b. The three layers of branch pipes outside the tank wall converge on the sampling main pipe 20, and each branch pipe outside the tank wall is provided with an electric sampling Valve 10; the flushing system includes a water tank 13, a water pump 23, three flushing pipes and an electric water valve 17; the water outlet of the water tank 13 is connected to the inlet of the water pump 23, and the outlet of the water pump 23 is connected to the upper flushing pipe 14. Two flushing branches are added to the upper flushing pipe 14 near the end of the slurry storage tank, namely the middle flushing pipe 15 and the lower flushing pipe 16. Each flushing pipe is provided with an electric water valve 17 near the end of the sampling pipe; the control system includes an on-site PLC controller that centrally controls the electric sampling valve 10 and the electric water valve 17.

[0033] Example 3

[0034] Based on Example 2,

[0035] The PLC controller is controlled in the following manner: the three electric sampling valves 10 and the three electric water valves 17 are all integrated into the local PLC controller. The on-site sampling operator operates the local control cabinet to selectively open a certain electric sampling valve or electric water valve; the upper, middle and lower sampling valves are opened in sequence according to the intervals T1 and T2. By determining the total sampling volume Q and the set valve opening interval time, the upper, middle and lower sampling volumes are ensured to be the same, thereby ensuring the uniformity and representativeness of the sampling.

[0036] The interval time is calculated according to the following formula: suppose the total sampling volume is Q (variable), the total height of the slurry storage tank 1 is H, the diameter is D, the height of the upper branch pipe from the tank bottom is H1, the sampling volume is Q1, the height of the middle branch pipe from the tank bottom is H2, the sampling volume is Q2, the height of the lower branch pipe from the tank bottom is H3, the sampling volume is Q3; the length of the sampling branch pipe in each layer is L1, the pipe diameter is d1, the length of the sampling main pipe is L2, the pipe diameter is d2, the sampling time interval between the upper branch pipe and the middle branch pipe is T1, and the sampling time interval between the middle branch pipe and the lower branch pipe is T2.

[0037] The length of the sampling branch pipe is L1, and the length of the sampling main pipe is L 2、 The design parameters for the sampling time interval T1 between the upper branch and the middle branch and the sampling time interval T2 of the lower branch are:

[0038] L1=D / 2-(10-20cm)

[0039] L2=H1+H2+H3=60%-80%H

[0040] T1=π(L1d1 2 +H1d2 2 ) / 4Q1

[0041] T2=πL1d1 2 / 4Q2+πH2d2 2 / 4 (Q1 + Q2)

[0042] The total sampling amount Q=Q1+Q2+Q3.

[0043] The utility model can perform immediate flushing after sampling, open the electric water valve 17, close the sampling electric valve 10 to flush the sampling tube, and the flushing waste water is discharged through the sampling dry pipe, directly avoiding the valve jamming problem caused by pipeline blockage.

[0044] The upward inclination angle of the pipe opening of the sampling branch pipe in the quantitative sampling device for a large slurry storage tank of the utility model is 3-10 degrees, so that the slurry can flow out quickly and smoothly during the sampling process.

Claims

1. Large slurry storage tank quantitative sampling device, characterized in that: The invention comprises a pulp storage tank (1), wherein the pulp storage tank (1) is provided with a double-layer agitator, wherein the double-layer agitator comprises a central shaft (22) longitudinally inserted into the tank, and an upper blade (2) and a lower blade (3) are provided on the central shaft (22); a sampling pipe is connected to the tank wall of the pulp storage tank (1), wherein the sampling pipe comprises a sampling branch pipe and a sampling main pipe which are connected to each other, wherein the sampling branch pipe is divided into a Y-shaped upper branch pipe (4), a middle branch pipe (6) and a lower branch pipe (8), wherein the three branch pipes are parallel to each other and arranged obliquely relative to the horizontal plane, wherein the pipe opening of the sampling branch pipe is inclined upward at an angle of 3-10°, and the sampling main pipe is arranged vertically along the outside of the tank wall, and the three branch pipes are respectively connected to the sampling main pipe (20).

2. The large-scale slurry storage tank quantitative sampling device according to claim 1 is characterized in that: One end of the sampling branch pipe penetrates into the interior of the tank body at a distance of 10-20 cm from the central axis, and the other end is connected to the sampling main pipe (20) at an obtuse angle of 93-100 degrees.

3. The large-scale slurry storage tank quantitative sampling device according to claim 2, characterized in that: The invention also includes a flushing pipe, one end of which is connected to a water tank (13), a flushing water pump (23) is provided on the connecting pipe between the water tank (13) and the flushing pipe, one end of which is connected to a sampling pipe, and the flushing pipe is branched into an upper flushing pipe (14), a middle flushing pipe (15) and a lower flushing pipe (16) by a main pipe near one end of the sampling pipe, and the upper, middle and lower flushing pipes are respectively connected to the back of the electric sampling valve (10) of the sampling branch pipe.

4. The large-scale slurry storage tank quantitative sampling device according to claim 2, characterized in that: The upper branch pipe (4) is 60-80% of the height from the tank bottom, the middle branch pipe (6) is 40-60% of the height from the tank bottom, the middle branch pipe (6) is between the two layers of blades, and the lower branch pipe is 10-20% of the height from the tank bottom.

5. The large-scale slurry storage tank quantitative sampling device according to claim 3, characterized in that: The upper flushing pipe (14), the middle flushing pipe (15), and the lower flushing pipe (16) are all provided with electric water valves (17); and the PLC controller (21) centrally controls the electric sampling valve (10) and the electric water valves (17).

6. The large-scale slurry storage tank quantitative sampling device according to claim 5, characterized in that: The PLC controller (21) is also connected to a PLC external digital display device, and the PLC external digital display device is installed next to the tank body.

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