CN110587489A - Automatic control device of grinding machine paper filtering system - Google Patents
Automatic control device of grinding machine paper filtering system Download PDFInfo
- Publication number
- CN110587489A CN110587489A CN201910859171.2A CN201910859171A CN110587489A CN 110587489 A CN110587489 A CN 110587489A CN 201910859171 A CN201910859171 A CN 201910859171A CN 110587489 A CN110587489 A CN 110587489A
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- Prior art keywords
- level sensor
- liquid level
- control device
- automatic control
- electrode
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001914 filtration Methods 0.000 title claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 230000001012 protector Effects 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000000615 nonconductor Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000007689 inspection Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
- B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The invention relates to an automatic control device of a grinder paper filtering system, which comprises a three-phase circuit breaker QS1, a contactor KM, a paper feeding motor, a two-phase circuit breaker QS2, a transformer TC, a rectifier bridge ZL, a filter capacitor C, a leakage protector LB, a control button SB, a contactor coil KM and a liquid level sensor TZ, wherein the liquid level sensor TZ corresponds to the height of grinding fluid in a filter tank body in a matching manner. The device fundamentally ensures the quality of grinding fluid, thereby ensuring the grinding quality of the roller, greatly reducing the fault rate of a filtering system, being sensitive and reliable in paper feeding control, being convenient for the point inspection and maintenance of maintainers, reducing the time of fault shutdown to the maximum extent, and greatly improving the working efficiency of the grinding machine in the use process.
Description
Technical Field
This patent application belongs to paper filtration control system technical field, and more specifically says, relates to a Wadrichs grinding machine paper filtration system's automatic control device.
Background
In the steel rolling production process, a roll is used for rolling. The roll grinder is an important device for grinding the roll surface of the roll according to various roll shape, precision, finish degree and other parameters required by steel rolling production, and is also a core device for steel rolling production. The grinding roller workshop is designed in a matching way according to a steel rolling production line and generally comprises 2-3 roller grinding machines, and most of the selected roller grinding machines are imported equipment. Because the steel rolling production belongs to continuous production, the working efficiency of the grinding machine is very important.
The grinding fluid which is not filtered in the grinding process of the roller contains a large amount of grinding wheel mud, and the grinding wheel mud is generally filtered by a magnetic filtering system and a paper filtering system and then repeatedly recycled in a certain period. The magnetic filtering system is only responsible for removing impurities containing steel and iron in the grinding fluid, other impurities contained in the grinding fluid are finally filtered by the paper filtering system, and the paper filtering is used as the last process of the grinding fluid filtering, so that the quality of the filtered grinding fluid is extremely important. If the filtering is not clean, the grinding fluid contains impurities which can cause the problems of roller surface scratching, poor grinding quality, high roller consumption and the like, and the roller grinding process and normal use are seriously influenced.
The original paper filtering system of the Wadrichs grinding machine is a float type paper filtering system, and because the float running mechanism has strict requirements on medium environment, and a large amount of silicon dioxide components in grinding fluid seriously restrict the normal running of the float type paper filtering system, the original paper filtering system is easy to lose control effect in actual use. The control that often takes place to lead to because of the float arm card is dead often controlled to be invalid, and the grinding fluid that does not filter overflows and pollutes dry clean grinding fluid and the phenomenon of paper feed out of control in the cabinet and often takes place, not only can not ensure the filtration quality of grinding fluid, still causes the extravagant a large amount of filter papers. The prior float type paper filtering system has the defects that the grinding quality problem is caused for many times and the failure rate is very high. As a control system for paper filtration, how to ensure the filtration quality, reduce mechanical faults and accurately control a paper filtration device is an important aspect of the normal operation of a roll grinder and is an original intention of the paper filtration control device of the grinder.
Disclosure of Invention
The invention aims to solve the technical problems of an automatic control device, overcomes the defects of high failure rate of an original floater mechanism, inaccurate paper feeding control and the like caused by serious pollution of grinding wheel mud, and achieves the purposes of ensuring the filtering quality, reducing mechanical failure and accurately controlling a paper filtering system under a complex working condition operation environment.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
an automatic control device of a grinder paper filtering system comprises a three-phase breaker QS1 connected with 380V alternating voltage, a contactor KM connected with each phase of the three-phase breaker QS1, a paper feeding motor connected with the contactor KM, a two-phase breaker QS2 connected with two phases of a three-phase breaker QS1, a transformer TC connected with the two-phase breaker QS2, and a rectifier bridge ZL connected with a transformation output end of the transformer TC, the high-precision grinding fluid automatic control device comprises a filter capacitor C, a leakage protector LB, a control button SB, a contactor coil KM and a liquid level sensor TZ, wherein the filter capacitor C is connected in series between a rectification positive electrode output end and a rectification negative electrode output end of a rectifier bridge ZL, the leakage protector LB is connected with the filter capacitor C in parallel, the control button SB is connected with the rectification negative electrode output end of the rectifier bridge ZL in series, the contactor coil KM is connected with the control button SB in series, the liquid level sensor TZ is connected with the control button SB in parallel, the liquid level sensor TZ corresponds to the grinding fluid in.
The technical scheme of the invention is further improved as follows: the transformer TC converts the 380V ac power into 24V ac power.
The technical scheme of the invention is further improved as follows: the liquid level sensor TZ is a contact type liquid level sensor, and a probe of the contact type liquid level sensor is arranged in the filtering tank body.
The technical scheme of the invention is further improved as follows: level sensor TZ is non-contact level sensor, non-contact level sensor includes the sensor body, last electrode and bottom electrode of both ends about setting at the sensor body, it sets up the upper end at the sensor body through the connecting rod coupling to go up the electrode, the bottom electrode passes through the auxiliary rod coupling and sets up the lower extreme at the sensor body, go up electrode and bottom electrode respectively with the top and the bottom laminating cooperation of filtering ponds box, the middle part of sensor body is provided with the connecting piece perpendicularly, the one end that the sensor body was kept away from to the connecting piece is provided with connection opening, the filtering ponds box is the box of non-conductor material.
The technical scheme of the invention is further improved as follows: the upper electrode and the lower electrode are soft electric conductors, and the filter tank body is a plastic or ceramic tank body.
The technical scheme of the invention is further improved as follows: the soft electric conductor is a soft copper plate or conductive rubber.
The technical scheme of the invention is further improved as follows: the connecting piece is an annular hoop.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the invention changes the defects that the traditional float type paper filtering system is blocked by a mechanical device frequently in the application of a grinder paper filtering system, the grinding fluid overflows frequently due to the failure of a control system and the machine is stopped for maintenance, the maintenance process causes secondary pollution of the grinding fluid, the quality of the grinding fluid cannot be ensured, and the problems of roller surface scratching, poor grinding quality, high roller consumption and the like, which exist for a long time, are indirectly caused. After the grinder paper filter control device is adopted, the failure rate of a filter system is greatly reduced by using verification paper, the paper feeding control is sensitive and reliable, the spot inspection and the maintenance of maintenance personnel are convenient, and the quality of grinding fluid is fundamentally ensured, so that the grinding quality of a roller is ensured. The device has the advantages of simple structure, convenient installation and use, maximally reducing the time of fault shutdown, and greatly improving the working efficiency of the grinding machine in the use process.
The invention provides a non-contact liquid level sensor, which is characterized in that the whole non-contact liquid level sensor is designed to be tightly attached to a filter tank body, and the principle that electrodes and the filter tank body are matched to form capacitors is utilized, so that the liquid level height of grinding liquid in the filter tank body is effectively measured, and meanwhile, the non-contact liquid level sensor is unique in structure, convenient to popularize and use and has stronger applicability.
Drawings
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a schematic structural view of a non-contact liquid level sensor of the present invention;
wherein: 1. the paper feeding device comprises three-phase circuit breakers QS1, 2, two-phase circuit breakers QS2, 3, contactors KM, 4, a paper feeding motor, 5, transformers TC, 6, rectifier bridges ZL, 7, filter capacitors C, 8, leakage protectors LB, 9, control buttons SB, 10, liquid level sensors TZ, 11, contactor coils KM and KM, 101, sensor bodies, 102, upper electrodes, 103, lower electrodes, 104, connecting rods, 105, auxiliary rods, 106, connecting pieces, 107 and connecting openings.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention discloses an automatic control device of a grinder paper filtering system, which comprises a three-phase breaker QS 11 connected with 380V alternating voltage, a contactor KM 3 connected with each phase of the three-phase breaker QS 11, a paper feeding motor 4 connected with the contactor KM 3, a two-phase breaker QS 22 connected with two phases of the three-phase breaker QS 11, a transformer TC5 connected with the two-phase breaker ZL 22, a rectifier bridge ZL6 connected with the voltage transformation output end of the transformer TC5, a filter capacitor C7 connected in series between the rectification anode output end and the rectification cathode output end of the rectifier bridge ZL6, a leakage protector LB8 connected in parallel with the filter capacitor C7, a control button SB 9 connected in series with the rectification cathode output end of the rectifier bridge 6, a contactor coil KM 11 connected in series with the control button SB 9, and a liquid level sensor TZ10 connected in parallel with the control button SB 9, the liquid level sensor TZ10 corresponds to the grinding fluid in the filtering tank body in a height matching mode, and the other end of the contactor coil KM 11 is connected with the rectifying anode output end of the rectifying bridge ZL6 in series.
The transformer TC5 converts 380V alternating current into 24V alternating current, the liquid level sensor TZ10 is a contact type liquid level sensor, and a probe of the contact type liquid level sensor is arranged in the filter tank body.
Or liquid level sensor TZ10 is non-contact liquid level sensor, non-contact liquid level sensor includes sensor body 101, set up last electrode 102 and lower electrode 103 at sensor body 101 upper and lower both ends, it sets up the upper end at sensor body 101 to go up electrode 102 through connecting rod 104 coupling, lower electrode 103 passes through auxiliary rod 105 coupling and sets up the lower extreme at sensor body, go up electrode 102 and lower electrode 103 respectively with the top and the bottom laminating cooperation of filtering ponds box, the middle part of sensor body 101 is provided with connecting piece 106 perpendicularly, the one end that sensor body 101 was kept away from to connecting piece 106 is provided with connection opening 107, the filtering ponds box is the box of non-conductor material.
The upper electrode 102 and the lower electrode 103 are both soft conductors, and the soft conductors are soft copper plates or conductive rubber. The filter tank body is a plastic or ceramic tank body. The connector 106 is a loop anchor ear. The upper electrode 102 is plate-shaped, and the lower electrode 103 is plate-shaped or ring-shaped with an opening (see fig. 2), so that the bottom part of the filter tank body can be attached or hung conveniently.
The non-contact liquid level sensor effectively measures the grinding fluid in the filtering tank body by utilizing the principle that the upper electrode 102 and the lower electrode 103 form capacitance with the filtering tank body. The specific principle is as follows: the circuit board of the non-contact liquid level sensor applies a pulse direct current voltage with a negative pole (for example, -10V) to the upper electrode 3 and the lower electrode 5, so that a potential difference exists between the upper electrode 3 and the lower electrode 5, and a stable electric field is formed between the upper electrode 3 and the lower electrode 5. The on and off states of the pulsed dc current alternate. In the power-on state, the capacitor is actually charged due to the characteristic of isolating direct current and direct current. When the capacitor is in the power-on state, the capacitor discharges, and the capacitance value can be judged according to the discharge time of the capacitor. When the grinding fluid of the filter tank body is empty, the internal space of the filter tank body is filled with air. Air constitutes the dielectric of the capacitor, and a base capacitance value C0 can be measured. When grinding fluid is present in the filter tank body, the grinding fluid can form part of dielectric medium of the capacitor, and a capacitance value C1 can be measured. Since the grinding fluid and air have different dielectric constants, C1 and C0 are different from each other, and the capacitance difference Δ C, Δ C being C1-C0 is obtained by subtracting the two, whereby the level of the grinding fluid in the filter tank body can be obtained. The capacitance difference value delta C and the liquid level of the grinding fluid in the filter tank body are basically in a linear relation, so that the liquid level can be monitored in real time.
When the device is used, a 380V power supply is converted into a 24V safety power supply through a transformer TC5, and then the power supply is further rectified into DC24V through a rectifier bridge ZL6 to serve as a control power supply. When a paper feeding motor 4 of the grinding machine normally works, along with the continuous accumulation of grinding wheel mud on filter paper, the grinding fluid level on the upper layer of the filter paper in a filter tank body rises along with the accumulation of the grinding wheel mud, when the grinding fluid level rises to reach the height of a preset liquid level sensor TZ10, the liquid level sensor TZ10 forms a loop through grinding fluid and DC24+ to enable a direct current contactor coil KM 11 to be attracted, after the contactor coil KM 11 is attracted, a paper feeding motor M4 rotates to drive the filter paper to move through a transmission device, waste paper accumulated with the grinding wheel mud is moved into a recycling tank, meanwhile, new paper is replenished into the filter tank body, so that the grinding fluid level is lowered, after the liquid level sensor TZ10 is separated from contact with the grinding fluid level, the contactor coil KM 11 loses power to disconnect a contactor KM 3, and the paper feeding motor M4 stops rotating. The adjustment of the height difference between the liquid level sensor TZ10 and the grinding liquid level determines the thickness of the grinding wheel sludge accumulated on the filter paper, and also determines the activation frequency of the paper feeding motor M4. Wherein, the paper feeding control button SB 9 is convenient for manual control when the filter paper is replaced, the leakage protector LB8 prevents accidental electric shock accidents, and the operation safety performance is improved.
Claims (7)
1. The utility model provides a grinding machine paper filtration system's automatic control device which characterized in that: comprises a three-phase breaker QS1 (1) connected with 380V alternating voltage, a contactor KM (3) connected with each phase of the three-phase breaker QS1 (1), a paper feeding motor (4) connected with the contactor KM (3), a two-phase breaker QS2 (2) connected with two phases of the three-phase breaker QS1 (1), a transformer TC (5) connected with the two-phase breaker QS2 (2), a rectifier bridge ZL (6) connected with the voltage transformation output end of the transformer TC (5), a filter capacitor C (7) connected in series between the rectification anode output end and the rectification cathode output end of the rectifier bridge ZL (6), a leakage protector LB (8) connected in parallel with the filter capacitor C (7), a control button SB (9) connected in series with the rectification cathode output end of the rectifier bridge (6), a contactor coil KM (11) connected in series with the control button SB (9), and a liquid level sensor TZ (10) connected in parallel with the control button SB (9), the liquid level sensor TZ (10) corresponds to the grinding fluid in the filter tank body in a highly matched mode, and the other end of the contactor coil KM (11) is connected with the rectifying anode output end of the rectifying bridge ZL (6) in series.
2. The automatic control device of a grinder paper filter system as claimed in claim 1, wherein: the transformer TC (5) converts 380V alternating current into 24V alternating current.
3. The automatic control device of a grinder paper filter system as claimed in claim 2, wherein: the liquid level sensor TZ (10) is a contact type liquid level sensor, and a probe of the contact type liquid level sensor is arranged in the filtering tank body.
4. The automatic control device of a grinder paper filter system as claimed in claim 2, wherein: level sensor TZ (10) is non-contact level sensor, non-contact level sensor includes sensor body (101), set up last electrode (102) and bottom electrode (103) at sensor body (101) upper and lower both ends, it sets up the upper end at sensor body (101) to go up electrode (102) through connecting rod (104) coupling, bottom electrode (103) set up the lower extreme at sensor body through auxiliary rod (105) coupling, go up electrode (102) and bottom electrode (103) respectively with the top and the bottom laminating cooperation of filtering ponds box, the middle part of sensor body (101) is provided with connecting piece (106) perpendicularly, the one end that sensor body (101) were kept away from in connecting piece (106) is provided with connection opening (107), the filtering ponds box is the box of non-conductor material.
5. The automatic control device of a grinder paper filter system as claimed in claim 4, wherein: the upper electrode (102) and the lower electrode (103) are both soft electric conductors, and the filter tank body is a plastic or ceramic tank body.
6. The automatic control device of a grinder paper filter system as claimed in claim 5, wherein: the soft electric conductor is a soft copper plate or conductive rubber.
7. The automatic control device of a grinder paper filter system as claimed in claim 6, wherein: the connecting piece (106) is an annular hoop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910859171.2A CN110587489A (en) | 2019-09-11 | 2019-09-11 | Automatic control device of grinding machine paper filtering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910859171.2A CN110587489A (en) | 2019-09-11 | 2019-09-11 | Automatic control device of grinding machine paper filtering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110587489A true CN110587489A (en) | 2019-12-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910859171.2A Withdrawn CN110587489A (en) | 2019-09-11 | 2019-09-11 | Automatic control device of grinding machine paper filtering system |
Country Status (1)
| Country | Link |
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| CN (1) | CN110587489A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2291188Y (en) * | 1997-04-15 | 1998-09-16 | 庞信 | Suction chain net paper tape filtering oil remover |
| CN2869956Y (en) * | 2005-10-08 | 2007-02-14 | 叶相灿 | Liquid-level relay |
| CN201157719Y (en) * | 2007-12-26 | 2008-12-03 | 沈阳机床股份有限公司钣焊件厂 | Drum type paper tape filter |
| CN204017496U (en) * | 2014-08-06 | 2014-12-17 | 烟台开发区博森科技发展有限公司 | A kind of horizontally-inclined paper-tape filter device |
| CN204883401U (en) * | 2015-09-09 | 2015-12-16 | 李婉璐 | Automatic control device of power plant's water tank |
| JP6246273B1 (en) * | 2016-07-13 | 2017-12-13 | 四国工業株式会社 | Sludge separator and method for cutting grinding fluid |
| CN107984391A (en) * | 2017-12-30 | 2018-05-04 | 襄阳福坦铁路轴承有限公司 | A kind of power supply device of grinding machine |
| CN208304796U (en) * | 2018-06-12 | 2019-01-01 | 芜湖市宇恒特种钢球有限公司 | A kind of accurate steel balls processing grinding fluid recycling device |
| CN209102185U (en) * | 2018-12-31 | 2019-07-12 | 江西水利职业学院(江西省水利水电学校、江西省灌溉排水发展中心、江西省水利工程技师学院） | Contactless liquid level sensor |
| CN211163536U (en) * | 2019-09-11 | 2020-08-04 | 唐山钢铁集团有限责任公司 | Automatic control device of grinding machine paper filtering system |
-
2019
- 2019-09-11 CN CN201910859171.2A patent/CN110587489A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2291188Y (en) * | 1997-04-15 | 1998-09-16 | 庞信 | Suction chain net paper tape filtering oil remover |
| CN2869956Y (en) * | 2005-10-08 | 2007-02-14 | 叶相灿 | Liquid-level relay |
| CN201157719Y (en) * | 2007-12-26 | 2008-12-03 | 沈阳机床股份有限公司钣焊件厂 | Drum type paper tape filter |
| CN204017496U (en) * | 2014-08-06 | 2014-12-17 | 烟台开发区博森科技发展有限公司 | A kind of horizontally-inclined paper-tape filter device |
| CN204883401U (en) * | 2015-09-09 | 2015-12-16 | 李婉璐 | Automatic control device of power plant's water tank |
| JP6246273B1 (en) * | 2016-07-13 | 2017-12-13 | 四国工業株式会社 | Sludge separator and method for cutting grinding fluid |
| CN107984391A (en) * | 2017-12-30 | 2018-05-04 | 襄阳福坦铁路轴承有限公司 | A kind of power supply device of grinding machine |
| CN208304796U (en) * | 2018-06-12 | 2019-01-01 | 芜湖市宇恒特种钢球有限公司 | A kind of accurate steel balls processing grinding fluid recycling device |
| CN209102185U (en) * | 2018-12-31 | 2019-07-12 | 江西水利职业学院(江西省水利水电学校、江西省灌溉排水发展中心、江西省水利工程技师学院） | Contactless liquid level sensor |
| CN211163536U (en) * | 2019-09-11 | 2020-08-04 | 唐山钢铁集团有限责任公司 | Automatic control device of grinding machine paper filtering system |
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Application publication date: 20191220 |