Coal mill material level detection device based on micro pressure difference
By installing a material level monitoring system at the feed inlet of the coal mill and utilizing the principle of micro-pressure difference, the problem of blockage in the material level monitoring pipe was solved, and high-precision material level monitoring was achieved.
Patent Information
- Application Number
- CN202423306994.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In traditional coal mill level monitoring devices, the level monitoring tube located in the coal block is easily blocked by the coal surface, resulting in inaccurate detection results.
A coal mill level detection device based on micro-differential pressure is adopted. Through the level monitoring system installed at the feed inlet, the upper and lower level pipes are cleaned and the differential pressure is monitored by first and second diversion solenoid valves, throttle valves and differential pressure sensors to ensure airflow balance and improve monitoring accuracy.
It enables accurate monitoring of the material level inside the coal mill, avoids clogging of the material level detection tube, and improves monitoring accuracy and stability.
Smart Images
Figure CN223747732U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of coal mill material level monitoring, more specifically to a coal mill material level detection device based on micro pressure difference. BACKGROUND
[0002] In the prior art, the material level inside the coal mill is monitored by the pressure difference between a material level monitoring pipe located in the coal block and a material level monitoring pipe located outside the coal block.
[0003] The material level monitoring pipe located in the coal block of the traditional material level monitoring device is easily blocked by the coal surface, resulting in inaccurate material level detection results.
[0004] Therefore, how to provide a new coal mill material level detection device based on micro pressure difference to ensure that the material level inside the coal mill can be monitored while the material level monitoring pipe located in the coal block can be cleaned is a problem that needs to be solved by those skilled in the art. SUMMARY
[0005] Therefore, the utility model provides a coal mill material level detection device based on micro pressure difference, which aims to solve the technical problem of the traditional material level monitoring device that the material level monitoring pipe located in the coal block is easily blocked by the coal surface.
[0006] A coal mill material level detection device based on micro pressure difference is installed in the inlet, comprising:
[0007] The material level monitoring system A comprises a material level monitoring pipe, a first shunt electromagnetic valve, a second shunt electromagnetic valve, a first throttle valve, a second throttle valve, and a pressure difference sensor.
[0008] The material level monitoring pipe comprises an upper material level pipe and a lower material level pipe, and the output ends of the upper material level pipe and the lower material level pipe are installed on the upper and lower inner side walls along the height direction of the inlet; the first shunt electromagnetic valve and the second shunt electromagnetic valve each have an outlet one, an inlet one, and an inlet two, the inlet one and the inlet two are in switching communication with the outlet one, the outlet one of the first shunt electromagnetic valve and the second shunt electromagnetic valve is in communication with the input end of the upper material level pipe and the lower material level pipe through a pipeline, the output end of the first throttle valve is in communication with the inlet two of the first shunt electromagnetic valve through a pipeline one, the output end of the second throttle valve is in communication with the inlet two of the second shunt electromagnetic valve through a pipeline two, and the monitoring input end of the pressure difference sensor is in communication with the pipeline one and the pipeline two through a pipeline.
[0009] The external air source is in communication with the first port of the three-way valve through a pipeline, the inlet one of the first shunt electromagnetic valve and the second shunt electromagnetic valve is in communication with the second port of the three-way valve through a pipeline, and the input end of the first throttle valve and the second throttle valve is in communication with the third port of the three-way valve through a pipeline.
[0010] By the above technical scheme, the utility model discloses a first shunt solenoid valve and second shunt solenoid valve corresponding inlet one are directly communicated with external air source, the inlet two of first shunt solenenum valve is communicated with external air source through first throttle valve, the inlet two of first shunt solenenum valve is communicated with external air source through second throttle valve, the outlet one of first shunt solenoid valve and second shunt solenoid valve is communicated with upper material level pipe and lower material level pipe respectively, and the outlet one is communicated with inlet one and inlet two, and thus, when the outlet one is communicated with inlet one, can clean upper material level pipe and lower material level pipe through external air source, when the outlet one is communicated with inlet two, external air source keeps constant through throttle valve and then enters coal mill through upper material level pipe and lower material level pipe, reads the pressure difference between upper material level pipe and lower material level pipe through the differential pressure sensor installed on pipeline one and pipeline two, and judges material level according to reading value, has the characteristics such as cleaning monitoring mutual interference, stable structure.
[0011] Preferably, it further includes material level monitoring system B, which has the same structure as material level monitoring system A and the same communication structure with external air source, and the output ends of the corresponding upper material level pipe and lower material level pipe are installed on the upper and lower inner side walls along the height direction of the discharge port.
[0012] Preferably, it further includes a gas tank, the input end of which is connected with the third port of the three-way device through a pipeline, and the output ends of the gas tank are connected with the input ends of the first throttle valve and the second throttle valve corresponding to material level monitoring system A and material level monitoring system B through a pipeline.
[0013] Preferably, it further includes a third differential pressure sensor, one detection input end of which is communicated with the gas tank through a pipeline, and the other detection input end is communicated with pipeline one corresponding to material level monitoring system A and material level monitoring system B through a pipeline.
[0014] Preferably, it further includes a purge main valve, the input end of which is connected with the second port of the three-way device through a pipeline, and the output ends of the purge main valve are connected with the inlet one of the first shunt solenoid valve and the second shunt solenoid valve corresponding to material level monitoring system A and material level monitoring system B through a pipeline.
[0015] Preferably, it further includes a pressure reducing valve one, which is connected between the three-way device and the purge main valve to adjust the input pressure of the purge circuit.
[0016] Preferably, the pressure sensor one, the pressure sensor two, the pressure sensor three, the pressure sensor four and the pressure sensor five are further included, the pressure sensor one is connected on the connecting pipeline between the upper material level pipe corresponding to the material level monitoring system A and the first shunt electromagnetic valve; the pressure sensor two is connected on the connecting pipeline between the lower material level pipe corresponding to the material level monitoring system A and the second shunt electromagnetic valve; the pressure sensor three is connected on the connecting pipeline between the upper material level pipe corresponding to the material level monitoring system B and the first shunt electromagnetic valve; the pressure sensor four is connected on the connecting pipeline between the lower material level pipe corresponding to the material level monitoring system B and the second shunt electromagnetic valve; and the pressure sensor five is connected with the gas tank through the pipeline.
[0017] Preferably, the water vapor separator is further included, and the water vapor separator is connected and installed on the pipeline between the three-way device and the external gas source.
[0018] Preferably, the measuring total valve is further included, and the measuring total valve is installed on the connecting pipeline between the input end of the gas tank and the three-way device.
[0019] Preferably, the pressure reducing valve two is further included, and the pressure reducing valve two is located on the connecting pipeline between the measuring total valve and the three-way device.
[0020] Compared with the prior art, the utility model discloses a kind of mill material level detection devices based on micro pressure difference, with the following beneficial effects: external gas source enters into pipeline one and pipeline two after passing through first throttle valve and second throttle valve, first throttle valve and second throttle valve control air flow, so that the initial air pressure in pipeline one and pipeline two is consistent as monitoring quantity, when working, because lower material level pipe in inner side wall of inlet is submerged by coal surface, leading to its air outlet process is hindered, in turn, the pressure in pipeline two is increased, can be compared with the air pressure value of corresponding pipeline one of upper material pipe also connected to the inside of mill, in turn, the air pressure difference of pipeline one and pipeline two is read by pressure difference sensor, the height of coal surface is judged, with the characteristics of high monitoring precision. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 A kind of mill material level detection devices based on micro pressure difference provided by the utility model is shown in the figure;
[0022] Figure 2 The three-dimensional schematic diagram of the mill provided by the utility model is shown in the figure;
[0023] Figure 3 The top view of the mill provided by the utility model is shown in the figure;
[0024] Figure 4 A-A sectional view of Figure 3 ;
[0025] Figure 5The utility model provides a kind of pipe structure diagram of coal mill material level detection device based on micro pressure difference for the utility model provides.
[0026] Figure 6 The utility model provides the structure diagram of shunt solenoid valve for the utility model provides.
[0027] Wherein: 1-coal mill;2-material level monitoring pipe;3-material level monitoring pipe one;4-shunt solenoid valve;8-external gas source;9-electric cabinet;11-drum;12-feeding inlet;13-discharge port;14-base;15-servo motor;21-upper material level pipe;22-lower material level pipe;31-upper material level pipe one;32-lower material level pipe one;41-outlet one;42-inlet one;43-inlet two;61-gas tank;62-throttle valve;63-first pressure difference sensor;64-second pressure difference sensor;65-third pressure difference sensor;66-pipeline one;67-pipeline two;68-pipeline three;69-pipeline four;701-purging master valve;702-pressure reducing valve one;703-pressure sensor one;704-pressure sensor two;705-pressure sensor three;706-pressure sensor four;707-pressure sensor five;708-water vapor separator;709-measuring master valve;710-pressure reducing valve two;711-ball valve;712-proportional valve;713-digital pressure gauge one;714-digital pressure gauge two;715-three-way device. DETAILED DESCRIPTION
[0028] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model, and not used to limit the scope of the utility model.
[0029] Referring to the accompanying Figures 1-6 The utility model discloses a kind of coal mill material level detection devices based on micro pressure difference, install in feeding inlet 12, include: material level monitoring system A and external gas source 8;
[0030] Material level monitoring system A includes material level monitoring pipe 2, first shunt solenoid valve, second shunt solenoid valve, first throttle valve, second throttle valve and pressure difference sensor;
[0031] The material level monitoring pipe 2 comprises an upper material level pipe 21 and a lower material level pipe 22, the output ends of the upper material level pipe 21 and the lower material level pipe 22 are respectively installed on the upper and lower inner side walls of the inlet 12 along the height direction; the first and second shunt electromagnetic valves each have an outlet one 41, an inlet one 42 and an inlet two 43, the inlet one 42 and the inlet two 43 are in switching communication with the outlet one 41, the outlet one 41 of the first and second shunt electromagnetic valves is respectively in communication with the input end of the upper material level pipe 21 and the lower material level pipe 22 through a pipeline, the output end of the first throttle valve is in communication with the inlet two 43 of the first shunt electromagnetic valve through a pipeline one 66, the output end of the second throttle valve is in communication with the inlet two 43 of the second shunt electromagnetic valve through a pipeline two 67, the monitoring input end of the differential pressure sensor is respectively in communication with the pipeline one 66 and the pipeline two 67 through a pipeline;
[0032] The external air source 8 is in communication with the first port of the three-way valve 715 through a pipeline, the inlet one 42 of the first and second shunt electromagnetic valves is in communication with the second port of the three-way valve 715 through a pipeline, the input end of the first and second throttle valves is in communication with the third port of the three-way valve 715 through a pipeline.
[0033] Specifically, the differential pressure sensor in the material level monitoring system A is a first differential pressure sensor 63.
[0034] In some embodiments, a material level monitoring system B is further included, the material level monitoring system B has the same structure as the material level monitoring system A and the same communication structure with the external air source 8, and the output ends of the upper material level pipe and the lower material level pipe corresponding thereto are respectively installed on the upper and lower inner side walls of the outlet 13 along the height direction.
[0035] Specifically, the material level monitoring system B comprises a material level monitoring pipe one 3, a third shunt electromagnetic valve, a fourth shunt electromagnetic valve, a third throttle valve, a fourth throttle valve and a second differential pressure sensor 64, the material level monitoring pipe one 3 comprises an upper material level pipe one 31 and a lower material level pipe one 32, the output ends of the upper material level pipe one 31 and the lower material level pipe one 32 are respectively installed on the upper and lower inner side walls of the outlet 13 along the height direction; the third and fourth shunt electromagnetic valves each have an outlet one 41, an inlet one 42 and an inlet two 43, the inlet one 42 and the inlet two 43 are in switching communication with the outlet one 41, the outlet one 41 of the third and fourth shunt electromagnetic valves is respectively in communication with the input end of the upper material level pipe one 31 and the lower material level pipe one 32 through a pipeline, the output end of the third throttle valve is in communication with the inlet two 43 of the third shunt electromagnetic valve through a pipeline three 68, the output end of the fourth throttle valve is in communication with the inlet two 43 of the fourth shunt electromagnetic valve through a pipeline four 69, the monitoring input end of the second differential pressure sensor 64 is respectively in communication with the pipeline three 68 and the pipeline four 69 through a pipeline.
[0036] In another embodiment, a gas tank 61 is further included, an input end of the gas tank 61 is connected with the third port of the three-way device 715 through a pipeline, and output ends of the gas tank 61 are both connected with input ends of the first throttle valve and the second throttle valve corresponding to the level monitoring system A and the level monitoring system B through pipelines.
[0037] In one embodiment, a third differential pressure sensor 65 is further included, a detection input end of the third differential pressure sensor 65 is connected with the gas tank 61 through a pipeline, and the other detection input end is connected with the pipeline one corresponding to the level monitoring system A and the level monitoring system B through a pipeline.
[0038] Specifically, the ball valve 711 is connected in series on the pipeline one 66, the pipeline two 67, the pipeline three 68 and the pipeline four 69, and the monitoring input ends of the first differential pressure sensor 63, the second differential pressure sensor 64 and the third differential pressure sensor 65 are connected to the pipeline between the ball valve 711 and the throttle valve 62.
[0039] Specifically, the other detection input end of the third differential pressure sensor 65 connected with the gas tank 61 is connected with the pipeline one 66 and the pipeline three 68 through a pipeline.
[0040] In one embodiment, a purge total valve 701 is further included, an input end of the purge total valve 701 is connected with the second port of the three-way device 715 through a pipeline, and output ends of the purge total valve 701 are connected with the inlet one 42 of the first shunt electromagnetic valve and the second shunt electromagnetic valve corresponding to the level monitoring system A and the level monitoring system B through pipelines.
[0041] In some embodiments, a pressure reducing valve one 702 is further included, which is connected between the three-way device 715 and the purge total valve 701, so as to adjust the size of the input pressure of the purge circuit.
[0042] In this embodiment, a pressure sensor one 703, a pressure sensor two 704, a pressure sensor three 705, a pressure sensor four 706 and a pressure sensor five 707 are further included, the pressure sensor one 703 is connected to the connecting pipeline between the upper level pipe corresponding to the level monitoring system A and the first shunt electromagnetic valve, the pressure sensor two 704 is connected to the connecting pipeline between the lower level pipe corresponding to the level monitoring system A and the second shunt electromagnetic valve, the pressure sensor three 705 is connected to the connecting pipeline between the upper level pipe corresponding to the level monitoring system B and the first shunt electromagnetic valve, the pressure sensor four 706 is connected to the connecting pipeline between the lower level pipe corresponding to the level monitoring system B and the second shunt electromagnetic valve, and the pressure sensor five 707 is connected with the gas tank 61 through a pipeline.
[0043] Specifically, ball valves 711 are connected in series between the upper material level pipe 21 and the pressure sensor one 703, between the lower material level pipe 22 and the pressure sensor two 704, between the upper material level pipe one 31 and the pressure sensor three 705, and between the lower material level pipe one 32 and the pressure sensor four 706. An electrical cabinet 9 is further included, the four ball valves 711 are all mounted on the side wall of the electrical cabinet 9, and all the components located on the other side of the four ball valves 711 connected with the material level detection pipes are mounted in the electrical cabinet 9.
[0044] More specifically, the coal mill 1 includes a roller 11 and a base 14, the axis of the roller 11 is horizontally arranged, and both ends of the roller 11 are provided with openings and are respectively an inlet 12 and an outlet 13, the base 14 is provided with support plates extending upward at both ends along the length direction of the base 14, and both ends of the roller 11 along the axis direction are rotationally connected with the support plates.
[0045] In some specific embodiments, a water vapor separator 708 is further included, and the water vapor separator 708 is connected and mounted on the pipeline between the three-way device 715 and the external air source 8.
[0046] Specifically, a digital pressure gauge one 713 is further included, and the detection input end of the digital pressure gauge one 713 is connected on the connecting pipeline between the external air source 8 and the three-way device 715, so that the pressure of the external air source 8 can be monitored.
[0047] Specifically, a digital pressure gauge two 714 is further included, and the digital pressure gauge two 714 is connected with the gas tank 61 through a pipeline, so that the pressure of the gas tank 61 can be monitored.
[0048] Specifically, a ball valve 711 is connected in series between the water vapor separator 708 and the external air source 8.
[0049] In other specific embodiments, a measurement total valve 709 is further included, and the measurement total valve 709 is mounted on the connecting pipeline between the input end of the gas tank 61 and the three-way device 715.
[0050] Specifically, a proportional valve 712 is further included, and the proportional valve 712 is mounted between the input end of the gas tank 61 and the measurement total valve 709 to control the speed of the compressed air flowing into the gas tank.
[0051] In other specific embodiments, a pressure reducing valve two 710 is further included, and the pressure reducing valve two 710 is mounted on the connecting pipeline between the measurement total valve 709 and the three-way device 715.
[0052] The specific principle and use method of the coal mill material level detection device based on micro pressure difference provided in the embodiment are as follows:
[0053] 1. Purge circuit, control the first shunt solenoid valve, the second shunt solenoid valve, the third shunt solenoid valve and the fourth shunt solenoid valve's export one 41 with the import two 43 communication, the high pressure gas provided by external gas source 8 is in turn through water vapor separator 708->three-way valve 715->pressure reducing valve one 702->purge total valve 701->[the first shunt solenoid valve, the second shunt solenoid valve, the third shunt solenoid valve, the fourth shunt solenoid valve]->[the upper loading position pipe 21, the lower loading position pipe 22, the upper loading position pipe one 31, the lower loading position pipe one 32];
[0054] 2. Measurement circuit, control the first shunt solenoid valve, the second shunt solenoid valve, the third shunt solenoid valve and the fourth shunt solenoid valve's export one 41 with the import one 42 communication, the high pressure gas provided by external gas source 8 is in turn through water vapor separator 708->three-way valve 715->pressure reducing valve two 710->measurement total valve 709->proportional valve 712->gas tank 61->throttle valve 62->[circuit one 66, circuit two 67, circuit three 68, circuit four 69]->[the first shunt solenoid valve, the second shunt solenoid valve, the third shunt solenoid valve, the fourth shunt solenoid valve]->[the upper loading position pipe 21, the lower loading position pipe 22, the upper loading position pipe one 31, the lower loading position pipe one 32].
[0055] The above is only the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A micro-pressure differential based coal mill level detection device installed at the inlet (12) characterized by, Comprising: a material level monitoring system A, which comprises a material level monitoring pipe (2), a first shunt electromagnetic valve, a second shunt electromagnetic valve, a first throttle valve, a second throttle valve and a differential pressure sensor; the material level monitoring pipe (2) comprises an upper material level pipe (21) and a lower material level pipe (22), the output ends of the upper material level pipe (21) and the lower material level pipe (22) are respectively installed on the upper and lower inner side walls of the inlet (12) in the height direction; the first shunt electromagnetic valve and the second shunt electromagnetic valve both have an outlet one (41), an inlet one (42) and an inlet two (43), the inlet one (42) and the inlet two (43) are in switching communication with the outlet one (41), the outlet one (41) of the first shunt electromagnetic valve and the second shunt electromagnetic valve is respectively in communication with the input end of the upper material level pipe (21) and the lower material level pipe (22) through a pipeline, the output end of the first throttle valve is in communication with the inlet two (43) of the first shunt electromagnetic valve through a pipeline one (66), the output end of the second throttle valve is in communication with the inlet two (43) of the second shunt electromagnetic valve through a pipeline two (67), the monitoring input end of the differential pressure sensor is in communication with the pipeline one (66) and the pipeline two (67) through a pipeline respectively; an external gas source (8) is in communication with the first port of a three-way valve (715) through a pipeline, the inlet one (42) of the first shunt electromagnetic valve and the second shunt electromagnetic valve is in communication with the second port of the three-way valve (715) through a pipeline; the input end of the first throttle valve and the second throttle valve is in communication with the third port of the three-way valve (715) through a pipeline.
2. A coal level detection device for a coal mill based on micro pressure difference as claimed in claim 1, wherein It also comprises a material level monitoring system B, which has the same structure as the material level monitoring system A and the same communication structure with the external gas source (8), and the output ends of the upper material level pipe and the lower material level pipe corresponding thereto are respectively installed on the upper and lower inner side walls of the outlet (13) in the height direction.
3. A coal level detection device for a coal mill based on micro pressure difference as claimed in claim 2, wherein It also comprises a gas tank (61), the input end of the gas tank (61) is connected with the third port of the three-way valve (715) through a pipeline, and the output end of the gas tank (61) is connected with the input end of the first throttle valve and the second throttle valve corresponding to the material level monitoring system A and the material level monitoring system B through a pipeline.
4. A coal level detection device based on micro pressure difference for a coal mill as claimed in claim 3, wherein, It also comprises a third differential pressure sensor (65), one detection input end of the third differential pressure sensor (65) is in communication with the gas tank (61) through a pipeline, and the other detection input end is in communication with the pipeline one corresponding to the material level monitoring system A and the material level monitoring system B through a pipeline.
5. A coal level detection device for a coal mill based on micro pressure difference as claimed in claim 4, wherein, It also comprises a purge total valve (701), the input end of the purge total valve (701) is connected with the second port of the three-way valve (715) through a pipeline, and the output end of the purge total valve (701) is connected with the inlet one (42) of the first shunt electromagnetic valve and the second shunt electromagnetic valve corresponding to the material level monitoring system A and the material level monitoring system B through a pipeline.
6. A coal level detection device based on micro pressure difference for a coal mill as claimed in claim 5, wherein, Also included is a pressure reducing valve one (702) connected between the tee joint (715) and the purge master valve (701).
7. A coal level detection device based on micro pressure difference for a coal mill as claimed in claim 3, wherein Also included are a pressure sensor one (703), a pressure sensor two (704), a pressure sensor three (705), a pressure sensor four (706), and a pressure sensor five (707). The pressure sensor one (703) is connected to the connecting pipeline between the upper material level pipe corresponding to the material level monitoring system A and the first shunt electromagnetic valve. The pressure sensor two (704) is connected to the connecting pipeline between the lower material level pipe corresponding to the material level monitoring system A and the second shunt electromagnetic valve. The pressure sensor three (705) is connected to the connecting pipeline between the upper material level pipe corresponding to the material level monitoring system B and the first shunt electromagnetic valve. The pressure sensor four (706) is connected to the connecting pipeline between the lower material level pipe corresponding to the material level monitoring system B and the second shunt electromagnetic valve. The pressure sensor five (707) is connected to the pipeline of the gas tank (61).
8. A coal level detection device for a coal mill based on micro pressure difference as claimed in claim 1, wherein, Also included is a water vapor separator (708) connected and installed on the pipeline between the tee joint (715) and the external gas source (8).
9. A coal level detection device based on micro pressure difference for a coal mill as claimed in claim 3, wherein, Also included is a measurement master valve (709) installed on the connecting pipeline between the input end of the gas tank (61) and the tee joint (715).
10. A coal level detection device for a coal mill based on micro pressure difference as claimed in claim 9, wherein Also included is a pressure reducing valve two (710) located on the connecting pipeline between the measurement master valve (709) and the tee joint (715).