CN110479449B - Pressure change rate-based crusher abnormal feeding control method and crusher - Google Patents
Pressure change rate-based crusher abnormal feeding control method and crusher Download PDFInfo
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- CN110479449B CN110479449B CN201910756990.4A CN201910756990A CN110479449B CN 110479449 B CN110479449 B CN 110479449B CN 201910756990 A CN201910756990 A CN 201910756990A CN 110479449 B CN110479449 B CN 110479449B
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- pressure value
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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
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/22—Feed or discharge means
- B02C18/2225—Feed means
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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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- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The invention discloses a pressure change rate-based crusher abnormal feeding control method, which comprises the following steps: collecting a pressure value of a hydraulic pipeline; comparing the pipeline pressure value with a first early warning pressure value, and if the pipeline pressure value is greater than or equal to the first early warning pressure value, alarming and stopping the machine; judging whether the pipeline pressure value continuously rises or not, and if the continuous rising times reach the early warning times and the pipeline pressure value reaches a second early warning pressure value, alarming and stopping; and judging whether the current hydraulic pipeline pressure value exceeds a reverse pressure value, starting the hydraulic motor to reversely rotate if the current hydraulic pipeline pressure value exceeds the reverse pressure value, and otherwise, continuing to circulate. According to the technical scheme, the pressure sensor is adopted to detect the pressure value of the hydraulic pipeline, the pressure signal can be converted into a 4-20 milliampere current signal within a few seconds, on one hand, the PLC continuously detects the change rate of the current signal, when the change rate is larger than a set value, the feeding of a large metal block is considered to be abnormal, and the PLC alarms and stops the machine; on the other hand, the PLC judges whether the pressure value of the hydraulic pipeline continuously rises or not so as to quickly judge that the whole bundle of materials is too large to cause the rotation blockage of the knife box.
Description
Technical Field
The invention relates to a garbage crusher, in particular to a crusher abnormal feeding control method based on a pressure change rate and a crusher.
Background
With the enhancement of global environmental protection consciousness, particularly high importance is paid to garbage classification and recycling in China, and the application of garbage crushers is increasingly common. The power of the crusher is divided into electric drive and hydraulic drive, and the hydraulic drive is popular due to large power, quick response, simple control and stable operation. The hydraulic drive is usually that a hydraulic motor is connected with a cutter shaft through a speed reducer to drive the cutter shaft to rotate, and an oil pump provides power. As the garbage materials to be crushed have different shapes, the feeding mode is diversified and the feeding discontinuity occurs, the phenomenon of material clamping of the cutter box is inevitable, as long as the clamped materials are not hard metals and the like which are difficult to crush, the machine can be stopped firstly, then the cutter shafts are reversed, the clamped materials are withdrawn, then the machine is stopped for a short time and then the machine is firstly rotated forwards by one cutter shaft, the shaft is cut for a few seconds, then the other cutter shaft is also rotated forwards, and thus the two shafts are re-in the normal working state, namely, the two shafts rotate in opposite directions (forwards rotation). This is typically done: the process of forward rotation, material blocking reverse rotation and forward rotation is carried out, and after a blocked material appears, the blocked material can be eliminated for no more than a set number of times (usually 3-5 times). If the number of times of the crusher exceeds the set number, the crusher needs to be alarmed and shut down, manual inspection is carried out, whether materials which are difficult to crush (such as large iron blocks and the like) exist in the cutter box or not is judged, and the method is a common control method of the crusher at present. The set times are related to material characteristics and feeding modes and are determined empirically.
The oil circuit control principle is as follows: the main motor drives the oil pump, which in turn drives the hydraulic motor. The A port and the B port of each oil pump are respectively provided with a pressure gauge, and the oil pumps are variable pumps and are regulated by the proportional valves. When the clamping stagnation phenomenon occurs, the program automatically adjusts the opening of the proportional valve according to the detected feedback pressure, reduces the flow, correspondingly increases the oil pressure and keeps the power of the oil pump unchanged. And continuously detecting the feedback pressure of the oil circuit, immediately closing the proportional valve when the pressure reaches a set value, then starting reverse rotation, and recovering the forward rotation after delaying.
Because of the constant power regulation, the current change of the main motor is not obvious when overload occurs, and the severity of the clamping stagnation can be judged only through the change rate of the feedback pressure.
The method has the following defects: (1) the blockage caused by too much feeding or not much feeding cannot be distinguished, but massive metals which are difficult to break, such as pig iron blocks and the like, are mixed in the material. The existence of massive metal will damage the cutter teeth in multiple positive and negative rotation cycles, resulting in certain loss. (2) Because the severity of the blocking materials is not distinguished, if the blocking materials are small blocks, the blocking materials can be broken up through a plurality of times of forward and reverse rotation circulation, but if the whole bundle of materials fills up the knife box, the knife shaft is difficult to run in small steps, the forward and reverse rotation circulation is realized without supplement, and time is wasted.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for controlling abnormal feeding of a crusher based on a pressure change rate and a hydraulically-driven crusher.
The technical scheme adopted by the invention is as follows:
the method for controlling the abnormal feeding of the crusher based on the pressure change rate comprises the following steps
Collecting a pressure value of a hydraulic pipeline for driving the crusher;
comparing the pressure value of the hydraulic pipeline with a first early warning pressure value set by a system, if the pressure value of the hydraulic pipeline is greater than or equal to the first early warning pressure value, alarming and stopping, and if not, entering the next step;
judging whether the pressure value of the hydraulic pipeline continuously rises, if the continuous rising times reach the early warning times and the pressure value of the hydraulic pipeline reaches the second early warning pressure value, alarming and stopping, otherwise, entering the next step; wherein the second early warning pressure value is smaller than the first early warning pressure value;
and judging whether the current pressure value of the hydraulic pipeline exceeds a preset reverse pressure value, starting the hydraulic motor to reversely rotate if the current pressure value of the hydraulic pipeline exceeds the preset reverse pressure value, and otherwise, continuing to circulate.
Further, the pressure value of the hydraulic pipeline is collected by a pressure sensor, and the pressure sensor converts the pressure of the hydraulic pipeline into a current signal and feeds the current signal back to the PLC for judgment.
Preferably, the period for collecting the pressure value of the hydraulic line driving the crusher is 0.25 second.
Preferably, the first early warning pressure value is 350bar, and the second early warning pressure value is 320 bar.
Further, the number of early warning times is 3 to 6.
Preferably, the number of early warning times is 4.
The invention also comprises the technical scheme of the same inventive concept as the method, namely, the crusher applying the abnormal feeding control method of the crusher based on the pressure change rate comprises a main motor, a variable pump, a hydraulic motor, a pressure sensor, a proportional valve, a PLC and a knife box, wherein the main motor is connected with the variable pump and used for driving the variable pump to work, the variable pump is connected with the hydraulic motor through a hydraulic pipeline and used for driving the hydraulic motor to rotate, the proportional valve is used for adjusting the flow of the variable pump, the pressure sensor is used for detecting the pressure value of the hydraulic pipeline and feeding back the pressure value to the PLC, the PLC is respectively and electrically connected with the main motor, the pressure sensor and the proportional valve, and a knife shaft driven by the hydraulic motor is installed in the knife box.
Furthermore, the variable pump, the hydraulic motor, the pressure sensor, the proportional valve and the cutter shaft are provided with two groups.
The beneficial effects of the specific embodiment of the invention are as follows:
according to the technical scheme, the pressure sensor is adopted to detect the pressure value of the hydraulic pipeline, the pressure signal can be converted into a standard 4-20 milliampere current signal within a few seconds, so that the change rate of the current signal is continuously detected in the PLC, and when the change rate is greater than a certain set value, a large metal block is considered to be abnormal in feeding, an alarm is given and the machine is stopped, so that cutter teeth are prevented from being damaged in multiple forward and reverse rotation cycles; on the other hand, the PLC judges whether the pressure value of the hydraulic pipeline continuously rises or not so as to quickly judge that the whole bundle of materials is too large to cause the rotation blockage of the knife box, thereby alarming and stopping the machine, avoiding meaningless positive and negative rotation and saving time.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a flow chart of an embodiment of a method of abnormal feed control for a crusher according to the present invention;
fig. 2 is a schematic diagram of an embodiment of the crusher of the present invention.
Detailed Description
As shown in FIG. 1, the method for controlling abnormal feeding of a crusher based on pressure change rate according to the present invention comprises the following steps
Collecting a pressure value of a hydraulic pipeline for driving the crusher, and recording the pressure value as VD 600;
comparing the pressure value of the hydraulic pipeline with a first early warning pressure value set by a system, if the pressure value of the hydraulic pipeline is greater than or equal to the first early warning pressure value, alarming and stopping, and if not, entering the next step; in this embodiment, the first early warning pressure value is 350 bar;
judging whether the pressure value of the hydraulic pipeline continuously rises, if so, accumulating a counter, judging that the cutter box is locked, alarming and stopping when the frequency reaches the early warning frequency (4) and the pressure value of the hydraulic pipeline reaches a second early warning pressure value, and otherwise, entering the next step; the second early warning pressure value is smaller than the first early warning pressure value, the second early warning pressure value is 320bar, the VD604 is the pressure value of the hydraulic pipeline for which scanning is interrupted last time, and the initial value is 0;
and judging whether the current pressure value of the hydraulic pipeline exceeds a preset reversal pressure value VD716, starting the hydraulic motor to reverse if the current pressure value of the hydraulic pipeline exceeds the preset reversal pressure value VD716, and otherwise, continuing circulation.
Specifically, the pressure value of the hydraulic pipeline is collected by a pressure sensor, and the pressure sensor converts the pressure of the hydraulic pipeline into a current signal and feeds the current signal back to the PLC for judgment.
The period of collecting the pressure value of the hydraulic pipeline for driving the crusher is 0.25 second, and the early warning times are 3 to 6. The preferred number of pre-alarms is 4. In the figure, whether the pressure reaches 320bar in 1 second is taken as the basis for judging whether foreign matters exist in the cutter box, which is only an example and can be determined according to the actual hydraulic system and the compactness of the crushed material.
The invention of the technical scheme has the conception that when large metal and other foreign matters exist, the pressure value of the hydraulic pipeline is extremely large, and the hydraulic pipeline can be identified by setting a large early warning value. When hard large solid material stalling exists, the pressure value of the hydraulic pipeline needs to rise much faster than that of normal broken common garbage, so that the pressure value can be identified by setting a short time to reach another early warning value, therefore, based on the pressure change rate, the scheme adopts the pressure sensor to detect the pressure value of the hydraulic pipeline, can convert the pressure signal into a standard 4-20 milliampere current signal within a few seconds, and then inside the PLC, on one hand, the change rate of the current signal is continuously detected, when the change rate is greater than a certain set value, the large metal feeding is considered to be abnormal, the alarm is given and the machine is stopped, and the cutter teeth are prevented from being damaged in multiple forward and reverse rotation cycles; on the other hand, the PLC judges whether the pressure value of the hydraulic pipeline continuously rises or not so as to quickly judge that the whole bundle of materials is too large to cause the rotation blockage of the knife box, thereby alarming and stopping the machine, avoiding meaningless positive and negative rotation and saving time.
The invention also comprises the technical scheme of the same inventive concept as the method, namely the crusher applying the abnormal feeding control method of the crusher based on the pressure change rate comprises a main motor 1, a variable pump 2, a hydraulic motor 3, a pressure sensor 4, a proportional valve 5, a PLC and a knife box 6, wherein the main motor 1 is connected with the variable pump 2 to drive the variable pump 2 to work, the variable pump 2 is connected with the hydraulic motor 3 through a hydraulic pipeline to drive the hydraulic motor 3 to rotate, the proportional valve 5 is used for adjusting the flow of the variable pump 2, the pressure sensor 4 is used for detecting the pressure value of the hydraulic pipeline and feeding back the pressure value to the PLC, the PLC is respectively and electrically connected with the main motor 1, the pressure sensor 4 and the proportional valve 5, and a knife shaft 7 driven by the hydraulic motor 3 is installed in the knife box 6.
As a further development of the above technical solution, the variable pump 2, the hydraulic motor 3, the pressure sensor 4, the proportional valve 5, and the cutter shaft 7 have two sets.
The above embodiments are illustrative of the present invention, but the present invention is not limited to the details of the above embodiments, and various equivalent substitutions or simple modifications within the technical spirit of the present invention by those skilled in the art should be included in the scope of the present invention.
Claims (8)
1. The method for controlling the abnormal feeding of the crusher based on the pressure change rate is characterized by comprising the following steps
Collecting a pressure value of a hydraulic pipeline for driving the crusher;
comparing the pressure value of the hydraulic pipeline with a first early warning pressure value set by a system, if the pressure value of the hydraulic pipeline is greater than or equal to the first early warning pressure value, alarming and stopping, and if not, entering the next step;
judging whether the pressure value of the hydraulic pipeline continuously rises, if the continuous rising times reach the early warning times and the pressure value of the hydraulic pipeline reaches the second early warning pressure value, alarming and stopping, otherwise, entering the next step; wherein the second early warning pressure value is smaller than the first early warning pressure value;
and judging whether the current pressure value of the hydraulic pipeline exceeds a preset reverse pressure value, starting the hydraulic motor to reversely rotate if the current pressure value of the hydraulic pipeline exceeds the preset reverse pressure value, and otherwise, continuing to circulate.
2. The abnormal feed control method of a crusher based on a pressure change rate as claimed in claim 1, wherein: the pressure value of the hydraulic pipeline is collected by a pressure sensor, and the pressure sensor converts the pressure of the hydraulic pipeline into a current signal and feeds the current signal back to the PLC for judgment.
3. The abnormal feed control method of a crusher based on a pressure change rate as claimed in claim 1, wherein: the period for collecting the pressure value of the hydraulic pipeline for driving the crusher is 0.25 second.
4. The abnormal feed control method of a crusher based on a pressure change rate as claimed in claim 1, wherein: the first early warning pressure value is 350bar, and the second early warning pressure value is 320 bar.
5. The abnormal feed control method of a crusher based on a pressure change rate as claimed in claim 1, wherein: the early warning times are 3 to 6.
6. The abnormal feed control method of a crusher based on a pressure change rate as claimed in claim 5, wherein: the early warning times are 4 times.
7. A crusher applying the abnormal feeding control method of the crusher based on the pressure change rate as claimed in any one of claims 1 to 6, characterized by comprising a main motor, a variable pump, a hydraulic motor, a pressure sensor, a proportional valve, a PLC and a knife box, wherein the main motor is connected with the variable pump for driving the variable pump to work, the variable pump is connected with the hydraulic motor through a hydraulic pipeline for driving the hydraulic motor to rotate, the proportional valve is used for adjusting the flow of the variable pump, the pressure sensor is used for detecting the pressure value of the hydraulic pipeline and feeding the pressure value back to the PLC, the PLC is respectively electrically connected with the main motor, the pressure sensor and the proportional valve, and a knife shaft driven by the hydraulic motor is installed in the knife box.
8. The crusher of claim 7, wherein the variable displacement pump, hydraulic motor, pressure sensor, proportional valve, and cutter shaft have two sets.
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| CN201910756990.4A CN110479449B (en) | 2019-08-16 | 2019-08-16 | Pressure change rate-based crusher abnormal feeding control method and crusher |
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| CN201910756990.4A CN110479449B (en) | 2019-08-16 | 2019-08-16 | Pressure change rate-based crusher abnormal feeding control method and crusher |
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| CN116273426B (en) * | 2023-05-19 | 2023-08-25 | 四川磊蒙机械设备有限公司 | Sand and stone processing monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4034918A (en) * | 1975-08-06 | 1977-07-12 | Saturn Manufacturing, Inc. | Drive arrangement for rotary shredding apparatus |
| GB2096919B (en) * | 1981-03-11 | 1984-12-05 | Matsushita Electric Ind Co Ltd | Shredder |
| CA1219936A (en) * | 1984-04-13 | 1987-03-31 | Dan S. Burda | Speed-responsive reversing hydraulic drive for rotary shredder |
| CN104858041A (en) * | 2014-02-25 | 2015-08-26 | 徐千里 | Intelligent processor for processing kitchen food wastes |
| CN105214795B (en) * | 2015-11-03 | 2018-11-06 | 湖南三一路面机械有限公司 | A kind of shear crusher and its broken control method |
| CN105195300B (en) * | 2015-11-13 | 2017-07-21 | 四川川润液压润滑设备有限公司 | It is a kind of to overload the rotating shaft disintegrating machine and its overload controlling method of intelligent control |
| CN205570492U (en) * | 2016-04-01 | 2016-09-14 | 北京新景象园林绿化有限公司 | Branch grinder |
| CN108311231A (en) * | 2017-01-18 | 2018-07-24 | 江苏省机械研究设计院有限责任公司 | A kind of slag breaker driving method |
| CN206642839U (en) * | 2017-02-21 | 2017-11-17 | 湖南永清机械制造有限公司 | A kind of equipment for pulverizing material |
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