CN113102089A - Automatic wear compensation system for liner plate of cone crusher and control method - Google Patents
Automatic wear compensation system for liner plate of cone crusher and control method Download PDFInfo
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- CN113102089A CN113102089A CN202110495845.2A CN202110495845A CN113102089A CN 113102089 A CN113102089 A CN 113102089A CN 202110495845 A CN202110495845 A CN 202110495845A CN 113102089 A CN113102089 A CN 113102089A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 28
- 238000005299 abrasion Methods 0.000 claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2/00—Crushing or disintegrating by gyratory or cone crushers
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Abstract
The invention discloses an automatic wear compensation system for a lining plate of a cone crusher and a control method, and belongs to the technical field of crushing machinery. Comprises a crusher fixed cone, a crusher moving cone and a discharge port adjusting oil cylinder; the oil outlet of the bidirectional hydraulic pump is connected with a control valve group, the oil return port of the control valve group is connected with an oil tank, and the oil outlet of the control valve group is connected with a discharge port adjusting oil cylinder; the oil outlet of the control valve group is also connected with a safety valve; the device comprises a pressure sensor for detecting the oil inlet pressure of the discharge port adjusting oil cylinder, a displacement sensor for detecting the stroke of the discharge port adjusting oil cylinder and a current sensor for detecting the working current of the motor, wherein the pressure sensor, the displacement sensor and the current sensor are connected with a controller, and the controller is connected with the motor. The invention can realize the adjustment and the setting of the discharge port of the crusher, compensate the abrasion of the lining plate in real time during crushing operation and keep the discharge port constant.
Description
Technical Field
The invention relates to an automatic wear compensation system for a lining plate of a cone crusher and a control method, and belongs to the technical field of crushing machinery.
Background
The single-cylinder cone crusher is a medium-fine crusher and is widely applied to industries such as metal mines, gravel aggregates and the like. The single-cylinder cone crusher mainly comprises an upper frame assembly, a lower frame assembly, a fixed cone assembly, a movable cone assembly, a main shaft assembly, an eccentric device, a transmission assembly, a hydraulic cylinder assembly, a hydraulic system, a lubricating system and an electric system. The working principle is that the motor drives the moving cone to do eccentric swinging motion through the transmission assembly, so that the gap between the fixed cone and the moving cone is continuously reduced and increased, and materials are continuously extruded and crushed.
The size of the discharge port of the crusher is adjusted by adjusting the lifting of a bottom hydraulic cylinder through a hydraulic system, and the hydraulic cylinder supports the lifting of a movable cone. Present single cylinder cone crusher bin outlet has been can realize the automatically regulated and the settlement of bin outlet, but because cone crusher's movable cone welt, fixed cone welt be wearing and tearing piece, when materials such as the broken ore of breaker, movable cone welt and fixed cone welt can take place wearing and tearing, inevitable can cause the bin outlet grow between movable cone welt and the fixed cone welt, lead to the defective material to increase, a large amount of finished products are lost when the breaker operation. In this case, the crusher is required to stop the crushing operation and adjust the discharge opening again, which affects the production efficiency of the production line.
Chinese patent discloses a discharge gate control system of cone crusher and cone crusher (ZL 201721432504.6), it can realize the adjustment and the settlement of discharge gate under the breaker non-operating condition, but its shortcoming lies in: the real-time adjustment of the discharge opening of the crusher in the working state cannot be realized.
The Chinese patent also discloses an intelligent control system (ZL 201720271047.0) for the discharge hole of a hydraulic cone crusher, which is provided with four pressure sensors at the lower part of a moving cone lining plate, and the defect of the mode is that: the realization is difficult, and factors such as feeding conditions, ore raw materials and the like are not considered, the factors can cause the pressure detected by the pressure sensor to fluctuate, no rule exists, and the control system is easily subjected to misjudgment.
Disclosure of Invention
In order to solve the technical problem, the invention provides an automatic wear compensation system for a lining plate of a cone crusher and a control method.
The invention is realized by the following technical scheme: an automatic wear compensation system for a lining plate of a cone crusher comprises a crusher fixed cone, a crusher moving cone and a discharge port adjusting oil cylinder for controlling the crusher moving cone; the hydraulic pump also comprises a bidirectional hydraulic pump and a motor connected with the bidirectional hydraulic pump; the oil outlet of the bidirectional hydraulic pump is connected with a control valve group, the oil return port of the control valve group is connected with an oil tank, and the oil outlet of the control valve group is connected with the discharge port adjusting oil cylinder; the oil outlet of the control valve group is also connected with a safety valve; the device also comprises a pressure sensor for detecting the oil inlet pressure of the discharge port adjusting oil cylinder, a displacement sensor for detecting the stroke of the discharge port adjusting oil cylinder and a current sensor for detecting the working current of the motor, wherein the pressure sensor, the displacement sensor and the current sensor are connected with a controller, and the controller is connected with the motor.
It further comprises the following steps: the discharge port adjusting oil cylinder is a single-action oil cylinder.
The safety valve is a pilot overflow valve.
The control valve group comprises a check valve III, a check valve IV, a hydraulic control check valve V, a check valve I, a check valve II, a pressure limiting valve, an overflow valve I and a ball valve; an oil outlet a of the bidirectional hydraulic pump is connected with inlet oil of a hydraulic control one-way valve V, an oil outlet of a one-way valve I and inlet oil of an overflow valve I; an oil outlet b of the bidirectional hydraulic pump is connected with an oil outlet of a one-way valve III and an oil inlet of a one-way valve IV, and the oil outlet b of the bidirectional hydraulic pump is also connected with a control end of a hydraulic control one-way valve V; the V oil outlet of the hydraulic control one-way valve is connected with a discharge port adjusting oil cylinder; the inlet oil of the one-way valve I is connected with an oil tank; an oil inlet of the one-way valve III is connected with an oil tank; the oil outlet of the one-way valve IV is connected with the ball valve, inlet oil of the pressure limiting valve and the oil outlet of the one-way valve II; the ball valve, the pressure limiting valve and the overflow valve I are connected with an oil tank; and an oil inlet of the check valve II is connected with an oil outlet of the hydraulic control check valve V.
An automatic wear compensation control method for a lining plate of a cone crusher,
the method comprises the following steps: carrying out zero calibration on a discharge opening of the crusher for the first time, and recording the value S1 of the displacement sensor;
step two: setting a discharge opening, and recording the working time as t when the crusher works for a period of time;
step three: carrying out zero calibration on the crusher at the discharge outlet for the second time, and recording the value S2 of the displacement sensor;
step four: calculating the abrasion loss of the lining plates of the fixed cone and the movable cone of the crusher in unit time within t time, and inputting the abrasion compensation amount of the lining plates of the movable cone and the fixed cone of the crusher in unit time into a controller, wherein the abrasion compensation amount of the lining plates is consistent with the calculated abrasion loss in unit time;
step five: when the properties of the ore raw materials and the material and the appearance of the lining plate of the crusher are changed, the abrasion loss of the lining plate in unit time needs to be calculated again, and the operation of the first step to the fourth step is repeated.
It further comprises the following steps: zero point calibration: the discharge port adjusting oil cylinder pushes the movable cone of the crusher until the movable cone of the crusher contacts with the lining plate of the fixed cone of the crusher; at this time, the discharge opening of the crusher is zero, the pressure value of the pressure sensor is increased, and the value S1 of the displacement sensor arranged below the discharge opening adjusting oil cylinder is recorded.
Setting a discharge opening: after the zero point calibration is finished, the numerical value of the discharge opening to be set is input through a human-computer interface of the controller, the controller controls the system to enable the discharge opening adjusting oil cylinder to descend, and when the discharge opening is adjusted to the set value, the displacement sensor sends out a signal, and the discharge opening adjusting oil cylinder stops descending.
Compared with the prior art, the invention has the beneficial effects that: the system and the control method can realize the adjustment and the setting of the discharge port of the crusher, compensate the abrasion of the lining plate in real time during crushing operation and keep the discharge port constant.
Drawings
FIG. 1 is a hydraulic schematic of an embodiment of the present invention;
in the figure: the hydraulic control system comprises a motor 1, a bidirectional hydraulic pump 2, a check valve 3, a check valve III, a check valve 4, a check valve IV, a pilot-controlled check valve 5, a check valve 6, a check valve 7, a pressure limiting valve 8, an overflow valve 9, a safety valve 10, a ball valve 11, a pressure sensor 12, a displacement sensor 13, a current sensor 14 and a discharge port adjusting oil cylinder 15.
FIG. 2 is a control structure of the embodiment of the present invention;
FIG. 3 is a flowchart of a control method according to a second embodiment of the present invention.
Detailed Description
The following are specific embodiments of the present invention, and the present invention will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 1 and 2, in an automatic wear compensation system for a lining plate of a cone crusher, a discharge port adjusting oil cylinder 15 in the crusher is used for pushing a movable cone of the crusher so as to adjust the distance between the lining plates of the movable cone of the crusher and a fixed cone of the crusher.
The motor 1 is connected with the bidirectional hydraulic pump 2 and is used for driving the bidirectional hydraulic pump 2; the bidirectional hydraulic pump 2 sucks oil from an oil tank and supplies oil to a hydraulic system. The bidirectional hydraulic pump 2 is provided with an oil outlet a and an oil outlet b, the oil outlet a and the oil outlet b are connected with an oil inlet of a control valve group, the control valve group is connected with a discharge port adjusting oil cylinder 15, and the oil inlet and the oil outlet of the discharge port adjusting oil cylinder 15 are controlled. The oil return port of the control valve group is connected with an oil tank, the oil outlet of the control valve group is also connected with a safety valve 10, and the safety valve 10 is a pilot overflow valve.
The control valve group includes:
an oil outlet a of the bidirectional hydraulic pump 2 is connected with an oil outlet of a one-way valve I6, inlet oil of an overflow valve I9 and inlet oil of a hydraulic control one-way valve V5; an oil outlet b of the bidirectional hydraulic pump 2 is connected with an oil outlet of a one-way valve III 3, an oil inlet of a one-way valve IV 4 and a control end of a hydraulic control one-way valve V5. An oil outlet of the hydraulic control one-way valve V5 is connected with a discharge port adjusting oil cylinder 15. The inlet oil of the one-way valve I6 is connected with an oil tank. An oil inlet of the one-way valve III 3 is connected with an oil tank. An oil outlet of the one-way valve IV 4 is connected with the ball valve 11, inlet oil of the pressure limiting valve 8 and an oil outlet of the one-way valve II 7. The ball valve 11, the pressure limiting valve 8 and the overflow valve I9 are connected with an oil tank. An oil inlet of the check valve II 7 is connected with an oil outlet of the hydraulic control check valve V5.
The pressure sensor 12 is installed on an oil inlet pipeline of the discharge opening adjusting oil cylinder 15 and used for detecting the oil inlet pressure of the discharge opening adjusting oil cylinder 15. The displacement sensor 13 is arranged on the discharge port adjusting oil cylinder 15 and used for adjusting the stroke of the oil cylinder 15 at the discharge port. The current sensor 14 is connected with the motor 1 and used for detecting the working current of the motor 1. The pressure sensor 12, the displacement sensor 13 and the current sensor 14 are connected to the controller, and transmit detection signals to the controller. The controller is connected with the motor 1 and used for controlling the motor 1.
The working principle is as follows:
15 oil intakes of bin outlet adjusting cylinder reduce the bin outlet:
the motor rotates forwards, the port a of the bidirectional hydraulic pump absorbs oil, and the port b of the bidirectional hydraulic pump outputs oil. On the oil suction pipeline, the one-way valve IV 4 is closed, and the one-way valve III 3 is opened to suck oil from the oil tank. On the oil outlet pipeline, the one-way valve I is closed, the hydraulic control one-way valve V is opened, the one-way valve II is opened, the pressure limiting valve 8 is closed, the overflow valve I is closed, the ball valve 11 is closed, the safety valve 10 is closed, pressure oil enters the discharge opening adjusting oil cylinder 15, and the ascending discharge opening of the cylinder rod of the discharge opening adjusting oil cylinder 15 is reduced. At the moment, the oil outlet pressure of the bidirectional hydraulic pump is set by the overflow valve I9, and when the pressure is out of a set value, the overflow valve I9 overflows to the oil return tank.
15 oil returns of bin outlet adjusting cylinder, increase bin outlet:
and when the motor rotates reversely, the port b of the bidirectional hydraulic pump absorbs oil, and the port a of the bidirectional hydraulic pump outputs oil. On the oil suction pipeline, the bidirectional gear pump 2 is opened through the one-way valve I6, and oil is sucked from the oil tank firstly. On the oil outlet pipeline, the one-way valve III 3 is closed, the one-way valve IV 4 is opened, the pressure limiting valve 8 is opened, and the pressure of the oil outlet pipeline is increased. The hydraulic control one-way valve V5 is opened by pressure, the one-way valve II 7 is closed, and the oil suction port b of the bidirectional hydraulic pump is connected with the discharge port regulating oil cylinder 15. Then, the one-way valve I6 is closed, the two-way hydraulic pump starts to absorb oil from the discharge port adjusting oil cylinder 15, and the discharge port is increased;
oil at the oil outlet of the bidirectional hydraulic pump flows back to the oil tank through the one-way valve IV 4 and the overflow valve 8. Because the discharge port adjusting oil cylinder 15 is a single-action oil cylinder, when the discharge port is enlarged, oil can be quickly pumped from the oil cylinder to lower the movable cone of the crusher, and the operation time is shortened.
When the size of the discharge opening is fixed, the piston of the discharge opening adjusting oil cylinder 15 is locked by the hydraulic control one-way valve V5, and the stability of the discharge opening is kept. Set up relief valve 10 in the return circuit simultaneously, relief valve 10 is the guide's overflow valve, and when the breaker got into iron plate or other non-breakable thing, the guide's overflow valve released return circuit pressure rapidly, and the bin outlet is adjusted 15 descends, the bin outlet increase of hydro-cylinder, lets iron plate or other non-breakable thing pass through the bin outlet rapidly, guarantees that the breaker body can not transship, realizes overload protection.
Example two
An automatic wear compensation control method for a lining plate of a cone crusher is disclosed, which is based on the first embodiment and is combined with the method 3,
the method comprises the following steps: the crusher is subjected to a first zero calibration of the discharge opening and the value S1 of the displacement sensor 13 is recorded. Zero point calibration: the discharge port adjusting oil cylinder 15 pushes the movable cone of the crusher until the movable cone of the crusher contacts with the lining plate of the fixed cone of the crusher; at this time, the discharge opening of the crusher is zero, the pressure value of the pressure sensor 12 is increased, the system determines that the moving cone and the fixed cone are in contact with each other at this time, and the numerical value S1 of the displacement sensor 13 at this time is recorded;
step two: setting a discharge opening, and recording the working time as t when the crusher works for a period of time. Setting a discharge opening: after the zero point calibration is finished, inputting a numerical value of a discharge opening to be set through a human-computer interface of a controller, controlling a system by the controller to enable the discharge opening adjusting oil cylinder 15 to descend, and when the discharge opening is adjusted to a set value, sending a signal by the displacement sensor 13, and stopping descending the discharge opening adjusting oil cylinder 15;
step three: carrying out zero calibration on the discharge opening of the crusher for the second time, and recording the value S2 of the displacement sensor 13;
step four: calculating the abrasion loss of the lining plates of the fixed cone and the movable cone of the crusher in unit time within t time, and inputting the abrasion compensation amount of the lining plates of the movable cone and the fixed cone of the crusher in unit time into a controller, wherein the abrasion compensation amount of the lining plates is consistent with the calculated abrasion loss in unit time;
setting the automatic compensation amount of the lining plate: under the action of a hydraulic system, when the crusher is used for crushing operation, the discharge opening adjusting oil cylinder 15 can be lifted to compensate the increase of the discharge opening caused by the abrasion of the lining plate. In order to realize real-time compensation of the lining plate during the crushing operation of the crusher, a specific value of the rising of the hydraulic cylinder in unit time needs to be set in a control program. On the premise that the properties of the crushed materials, the size and the material of the lining plate are not changed, the compensation amount (mm/h) of the abrasion of the lining plate in the steps is equal to (S2-S1)/t, the compensation amount is input into a controller, for example, the compensation is 0.5mm per hour, and the crusher can realize real-time compensation of the abrasion in a working state;
step five: when the properties of the ore raw materials and the material and the appearance of the lining plate of the crusher are changed, the abrasion loss of the lining plate in unit time needs to be calculated again, and the operation of the first step to the fourth step is repeated. Besides the abrasion loss (mm/h) of the lining plate in unit time and the energy consumption value Kwh of the motor in unit time, the energy consumption value Kwh can also be used as the calculation basis of the abrasion compensation of the lining plate.
Claims (7)
1. An automatic wear compensation system for a lining plate of a cone crusher comprises a crusher fixed cone, a crusher moving cone and a discharge port adjusting oil cylinder (15) for controlling the crusher moving cone;
the method is characterized in that:
the hydraulic pump also comprises a bidirectional hydraulic pump (2) and a motor (1) connected with the bidirectional hydraulic pump (2); an oil outlet of the bidirectional hydraulic pump (2) is connected with a control valve group, an oil return port of the control valve group is connected with an oil tank, and an oil outlet of the control valve group is connected with the discharge port adjusting oil cylinder (15); the oil outlet of the control valve group is also connected with a safety valve (10);
the oil inlet pressure of the discharging opening adjusting oil cylinder (15) is detected by a pressure sensor (12), the stroke of the discharging opening adjusting oil cylinder (15) is detected by a displacement sensor (13), the current sensor (14) of the working current of the motor (1) is detected by the current sensor (14), the pressure sensor (12), the displacement sensor (13) and the current sensor (14) are connected with a controller, and the controller is connected with the motor (1).
2. The cone crusher liner automatic wear compensation system of claim 1, wherein: the discharge port adjusting oil cylinder (15) is a single-action oil cylinder.
3. The cone crusher liner automatic wear compensation system of claim 1, wherein: the safety valve (10) is a pilot overflow valve.
4. The cone crusher liner automatic wear compensation system of claim 1, wherein: the control valve group comprises a check valve III (3), a check valve IV (4), a hydraulic control check valve V (5), a check valve I (6), a check valve II (7), a pressure limiting valve (8), an overflow valve I (9) and a ball valve (11);
an oil outlet a of the bidirectional hydraulic pump (2) is connected with inlet oil of a hydraulic control one-way valve V (5), an oil outlet of a one-way valve I (6) and inlet oil of an overflow valve I (9); an oil outlet b of the bidirectional hydraulic pump (2) is connected with an oil outlet of a one-way valve III (3) and an oil inlet of a one-way valve IV (4), and the oil outlet b of the bidirectional hydraulic pump (2) is also connected to a control end of a hydraulic control one-way valve V (5);
the oil outlet of the hydraulic control one-way valve V (5) is connected with a discharge port adjusting oil cylinder (15);
the inlet oil of the one-way valve I (6) is connected with an oil tank;
an oil inlet of the one-way valve III (3) is connected with an oil tank;
the oil outlet of the one-way valve IV (4) is connected with the ball valve (11), the inlet oil of the pressure limiting valve (8) and the oil outlet of the one-way valve II (7);
the ball valve (11), the pressure limiting valve (8) and the overflow valve I (9) are connected with an oil tank;
and an oil inlet of the check valve II (7) is connected with an oil outlet of the hydraulic control check valve V (5).
5. An automatic wear compensation control method for a lining plate of a cone crusher, which adopts the automatic wear compensation system for the lining plate of the cone crusher as claimed in any one of claims 1 to 4, and is characterized in that:
the method comprises the following steps: carrying out first zero calibration on a discharge hole of the crusher, and recording a numerical value S1 of a displacement sensor (13);
step two: setting a discharge opening, and recording the working time as t when the crusher works for a period of time;
step three: carrying out zero calibration on the crusher at a discharge port for the second time, and recording the value S2 of the displacement sensor (13);
step four: calculating the abrasion loss of the lining plates of the fixed cone and the movable cone of the crusher in unit time within t time, and inputting the abrasion compensation amount of the lining plates of the movable cone and the fixed cone of the crusher in unit time into a controller, wherein the abrasion compensation amount of the lining plates is consistent with the calculated abrasion loss in unit time;
step five: when the properties of the ore raw materials and the material and the appearance of the lining plate of the crusher are changed, the abrasion loss of the lining plate in unit time needs to be calculated again, and the operation of the first step to the fourth step is repeated.
6. The cone crusher liner automatic wear compensation control method of claim 5, characterized in that:
zero point calibration:
a discharge port adjusting oil cylinder (15) pushes the movable cone of the crusher until the movable cone of the crusher contacts with a lining plate of a fixed cone of the crusher; at the moment, the discharge opening of the crusher is zero, the pressure value of the pressure sensor (12) is increased, and the value S1 of the displacement sensor (13) arranged below the discharge opening adjusting oil cylinder (15) at the moment is recorded.
7. The cone crusher liner automatic wear compensation control method of claim 5, characterized in that:
setting a discharge opening:
after the zero point calibration is finished, a numerical value of a discharge opening needing to be set is input through a human-computer interface of the controller, the controller controls the system to enable the discharge opening adjusting oil cylinder (15) to descend, and when the discharge opening is adjusted to a set value, the displacement sensor (13) sends a signal, and the discharge opening adjusting oil cylinder (15) stops descending.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110495845.2A CN113102089A (en) | 2021-05-07 | 2021-05-07 | Automatic wear compensation system for liner plate of cone crusher and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110495845.2A CN113102089A (en) | 2021-05-07 | 2021-05-07 | Automatic wear compensation system for liner plate of cone crusher and control method |
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| CN113102089A true CN113102089A (en) | 2021-07-13 |
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| CN202110495845.2A Pending CN113102089A (en) | 2021-05-07 | 2021-05-07 | Automatic wear compensation system for liner plate of cone crusher and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649161A (en) * | 2021-08-05 | 2021-11-16 | 南昌矿山机械有限公司 | Intelligent monitoring and discharge opening adjusting method for wear of lining plate of cone crusher |
| CN113700702A (en) * | 2021-08-04 | 2021-11-26 | 中国人民解放军火箭军工程大学 | Digital hydraulic cylinder working state non-intervention real-time monitoring system and using method |
| CN114950615A (en) * | 2022-04-29 | 2022-08-30 | 成都大宏立机器股份有限公司 | Automatic compensation control method for conical breaking discharge hole |
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| CN114950615B (en) * | 2022-04-29 | 2023-10-03 | 成都大宏立机器股份有限公司 | Automatic compensation control method for conical break discharge port |
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Application publication date: 20210713 |