CN108799213B - Safety system and method of automatic hydraulic press for refractory bricks - Google Patents
Safety system and method of automatic hydraulic press for refractory bricks Download PDFInfo
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- CN108799213B CN108799213B CN201810840578.6A CN201810840578A CN108799213B CN 108799213 B CN108799213 B CN 108799213B CN 201810840578 A CN201810840578 A CN 201810840578A CN 108799213 B CN108799213 B CN 108799213B
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- 239000011449 brick Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000001012 protector Effects 0.000 claims description 30
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 17
- 230000001960 triggered effect Effects 0.000 description 13
- 230000006872 improvement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 101100408352 Drosophila melanogaster Plc21C gene Proteins 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/0063—Control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
Abstract
The invention discloses a safety system of an automatic refractory brick hydraulic machine, which comprises a hydraulic system and a control system, wherein the hydraulic system comprises a power source, a control valve group, a cartridge valve group and a safety valve group with position feedback, and the power source is connected with the control valve group through the cartridge valve group and the safety valve group; the control system comprises a PLC controller, a programmable safety relay and a safety protection equipment group; the PLC controller outputs a first safety signal according to the signal of the safety protection equipment group and controls the working state of the cartridge valve group according to the first safety signal, and the programmable safety relay outputs a second safety signal according to the signal of the safety protection equipment group and the position feedback signal of the safety valve and controls the working state of the safety valve group according to the second safety signal. The invention also discloses a safety method of the automatic hydraulic press for refractory bricks. By adopting the invention, the effective separation of the power source and the control valve group can be realized, the potential safety hazard is eliminated, the safety of the brick press and operators is ensured, and the reliability of the brick press is improved.
Description
Technical Field
The invention relates to the technical field of electrical control, in particular to a safety system of an automatic hydraulic press for refractory bricks and a safety method of the automatic hydraulic press for refractory bricks.
Background
As shown in fig. 1, the hydraulic system of the existing refractory brick press mainly comprises a power source and a control valve group. Specifically, the power source comprises pumps P1', P2', P3' and an energy accumulator, and the control valve group mainly comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group. The oil inlet of the cartridge valve V1 'is communicated with the pump P3' and the energy accumulator, and the oil outlet is communicated with the lower movable beam control valve group. The oil inlet of the cartridge valve V2' is communicated with the pumps P1', P2', and the oil outlet is communicated with the lower movable beam control valve group. The oil inlet of the cartridge valve V3 'is communicated with the pump P3' and the energy accumulator, and the oil outlet is communicated with the skip car control valve group. The oil inlet of the cartridge valve V6 'is communicated with the pump P3' and the energy accumulator, and the oil outlet is communicated with the upper movable beam control valve group. The oil inlet of the cartridge valve V7' is communicated with the pumps P1', P2', and the oil outlet is communicated with the control valve group of the main oil cylinder.
As shown in fig. 2, the control system of the existing refractory brick press mainly comprises a PLC ', a sensor S1' for detecting the operation position and state of the brick press, a SE1 'for mechanical limit protection of the brick press, a scram switch SB1' for safety protection, a safety gate switch SQ1 'and a safety grating SG1'.
When the brick press works, the PLC ' is used for logically controlling the energizing or de-energizing of the electromagnetic valves YV1', YV2', YV3', YV6', YV7' (i.e. controlling the opening or closing of the cartridge valves V1', V2', V3', V6', V7 ') so as to realize the actions of different process stages; and the safety protection control is also used for the brick machine, and when any one of the limit protection SE1', the emergency stop switch SB1', the safety gate switch SQ1 'or the safety grating SG1' is triggered, the PLC alarms and processes, and the brick machine stops working.
Thus, the prior art has been successful and widely used on refractory brick presses, but this solution suffers from the following drawbacks: 1. the cartridge valve connecting the power source of the hydraulic system and the control valve group of the hydraulic system has no position feedback, and whether the cartridge valve works normally cannot be judged; 2. a separate safety valve is not arranged between a hydraulic system power source and a hydraulic system control valve bank of the brick machine, a cartridge valve which is connected with the hydraulic system power source and the hydraulic system control valve bank is used for relevant logic control of the brick machine operation, the cartridge valve is opened or closed according to the process requirement in the brick machine operation, the cartridge valve is also used for safety protection control, and the cartridge valve is closed when the brick machine alarms; 3. the control system PLC' of the brick machine is used for both logic control of the operation of the brick machine and safety protection control of the brick machine. Therefore, the prior art cannot ensure that a power source of a hydraulic system is isolated from a control valve group of the hydraulic system in an emergency, and potential safety hazards exist.
Disclosure of Invention
The invention aims to solve the technical problems of providing a safety system and a safety method of an automatic hydraulic press for refractory bricks, which can effectively separate a power source from a control valve group, eliminate potential safety hazards, ensure the safety of a brick press and operators and improve the reliability of the brick press.
In order to solve the technical problems, the invention provides a safety system of an automatic refractory brick hydraulic machine, which comprises a hydraulic system and a control system, wherein the hydraulic system comprises a power source, a control valve group, a cartridge valve group and a safety valve group with position feedback, and the power source is connected with the control valve group through the cartridge valve group and the safety valve group; the control system comprises a PLC controller, a programmable safety relay and a safety protection equipment group; the PLC controller outputs a first safety signal according to the signal of the safety protection equipment group and controls the working state of the cartridge valve group according to the first safety signal, and the programmable safety relay outputs a second safety signal according to the signal of the safety protection equipment group and the position feedback signal of the safety valve and controls the working state of the safety valve group according to the second safety signal.
As an improvement of the scheme, the power source comprises a first power pump, a second power pump, a third power pump and an accumulator; the control valve group comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group; the cartridge valve group comprises a first cartridge valve, a second cartridge valve, a sixth cartridge valve and a seventh cartridge valve; the safety valve group comprises a third safety valve with position feedback, a fourth safety valve with position feedback and a fifth safety valve with position feedback; the oil outlet of the first cartridge valve is communicated with the lower movable beam control valve bank, the oil outlet of the second cartridge valve is communicated with the lower movable beam control valve bank, the oil inlet of the third safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the third safety valve is communicated with the skip car control valve bank, the oil inlet of the fourth safety valve is communicated with the first power pump and the second power pump, the oil outlet of the fourth safety valve is communicated with the second cartridge valve and the seventh cartridge valve, the oil inlet of the fifth safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the fifth safety valve is communicated with the first cartridge valve and the sixth cartridge valve, the oil outlet of the sixth cartridge valve is communicated with the upper movable beam control valve bank, and the oil outlet of the seventh cartridge valve is communicated with the main oil cylinder control valve bank.
As an improvement of the scheme, the safety protection equipment group comprises a limit protector, a scram switch, a safety gate switch and a safety grating, wherein the limit protector is connected with the PLC, and the scram switch, the safety gate switch and the safety grating are connected with the programmable safety relay.
As an improvement of the scheme, the PLC outputs a first safety signal according to the limit protector signal and the scram switch signal, and controls the working state of the cartridge valve group according to the first safety signal; the programmable safety relay outputs a second safety signal according to the limit protector signal, the emergency stop switch signal, the safety gate switch signal, the safety grating signal and the safety valve position feedback signal, and controls the working state of the safety valve group according to the second safety signal.
As an improvement of the above scheme, the safety valve position feedback signal is also output to the PLC controller.
As an improvement of the scheme, the PLC and the programmable safety relay are in signal transmission through a communication line.
Correspondingly, the invention also provides a safety system method of the automatic hydraulic press for refractory bricks, which comprises the following steps:
the PLC outputs a first safety signal according to the signal of the safety protection equipment group, and controls the working state of the cartridge valve group according to the first safety signal;
the programmable safety relay outputs a second safety signal according to the signal of the safety protection equipment set and the position feedback signal of the safety valve, and controls the working state of the safety valve set according to the second safety signal, and the cartridge valve set and the safety valve set are used for connecting a power source and the control valve set.
As an improvement of the scheme, the power source comprises a first power pump, a second power pump, a third power pump and an accumulator; the control valve group comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group; the cartridge valve group comprises a first cartridge valve, a second cartridge valve, a sixth cartridge valve and a seventh cartridge valve; the safety valve group comprises a third safety valve with position feedback, a fourth safety valve with position feedback and a fifth safety valve with position feedback; the oil outlet of the first cartridge valve is communicated with the lower movable beam control valve bank, the oil outlet of the second cartridge valve is communicated with the lower movable beam control valve bank, the oil inlet of the third safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the third safety valve is communicated with the skip car control valve bank, the oil inlet of the fourth safety valve is communicated with the first power pump and the second power pump, the oil outlet of the fourth safety valve is communicated with the second cartridge valve and the seventh cartridge valve, the oil inlet of the fifth safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the fifth safety valve is communicated with the first cartridge valve and the sixth cartridge valve, the oil outlet of the sixth cartridge valve is communicated with the upper movable beam control valve bank, and the oil outlet of the seventh cartridge valve is communicated with the main oil cylinder control valve bank.
As an improvement of the scheme, the safety protection equipment group comprises a limit protector, an emergency stop switch, a safety door switch and a safety grating;
the PLC outputs a first safety signal according to the limit protector signal and the scram switch signal, and controls the working state of the cartridge valve group according to the first safety signal;
the programmable safety relay outputs a second safety signal according to the limit protector signal, the emergency stop switch signal, the safety gate switch signal, the safety grating signal and the safety valve position feedback signal, and controls the working state of the safety valve group according to the second safety signal.
As an improvement of the above scheme, the safety valve position feedback signal is also output to the PLC controller.
The implementation of the invention has the following beneficial effects:
according to the invention, the safety valve group with position feedback is added between the power source of the hydraulic system and the control valve group, and the cartridge valve group and the safety valve group work respectively in a unique connection mode of the safety valve group, so that not only can the logic control in the running process of the brick machine be realized through the cartridge valve group to meet the actual process requirements, but also whether the safety valve group works normally or not can be judged through the feedback signal of the safety valve group to realize the safety protection control of the brick machine;
the programmable safety relay is added, so that the PLC and the programmable safety relay work respectively, the plug-in valve group can be controlled by the PLC to realize logic control of the operation of the brick press, the safety valve group can be controlled by the programmable safety relay to realize safety protection control of the brick press, the power source of the hydraulic system can be effectively ensured to be isolated from the control valve group under emergency, and potential safety hazards are avoided.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system of a prior art refractory brick press;
FIG. 2 is a schematic diagram of a control system of a prior art refractory brick press;
FIG. 3 is a schematic structural view of the safety system of the automated hydraulic refractory brick press of the present invention;
FIG. 4 is a schematic diagram of the hydraulic system of the present invention;
FIG. 5 is a schematic diagram of the control system of the present invention;
FIG. 6 is a flow chart of a first embodiment of a safety method of the automated hydraulic refractory brick press of the present invention;
FIG. 7 is a flow chart of a second embodiment of the safety method of the automated hydraulic refractory brick press of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent. It is only stated that the terms of orientation such as up, down, left, right, front, back, inner, outer, etc. used in this document or the imminent present invention, are used only with reference to the drawings of the present invention, and are not meant to be limiting in any way.
As shown in fig. 3, a safety system 100 of the automatic refractory brick hydraulic press of the present invention comprises a hydraulic system 1 and a control system 2, specifically, the hydraulic system 1 comprises a power source 11, a control valve group 12, a cartridge valve group 13 and a safety valve group 14 with position feedback, wherein the power source 11 is connected with the control valve group 12 through the cartridge valve group 13 and the safety valve group 14; the control system 2 comprises a PLC controller 21, a programmable safety relay 22 and a safety protection device group 23, wherein the safety protection device group 23 comprises at least one safety protection device which is in communication with the PLC controller 21 and/or the programmable safety relay 22, respectively. The PLC controller 21 is preferably siemens 6es7 315-7TJ10-0AB0, and the safety relay 22 is preferably, but not limited to, pileated magnetic PNOZ 3, and the user may select according to the actual situation.
The PLC controller 21 outputs a first safety signal according to the signal of the safety protection device group 23 and controls the working state of the cartridge valve group 13 according to the first safety signal, and the programmable safety relay 22 outputs a second safety signal according to the signal of the safety protection device group 23 and the feedback signal of the safety valve position and controls the working state of the safety valve group 14 according to the second safety signal. When the brick machine works and safety protection equipment communicated with the PLC controller 21 is not triggered, the PLC controller 21 outputs a first safety signal; meanwhile, when the output signal of the safety protection device communicating with the programmable safety relay 22 is normal and the safety protection device communicating with the PLC controller 21 is not triggered, the programmable safety relay 22 outputs a second safety signal, after the programmable safety relay 22 outputs the second safety signal, after a certain time delay, if the output signal is not received by the safety valve position feedback signal yet, the programmable safety relay 22 stops outputting the second safety signal; therefore, when the first safety signal and the second safety signal are output normally, the brick press can operate normally.
Compared to prior art solutions, the hydraulic system 1 of the present invention adds a relief valve group 14 with position feedback. In the present invention, the PLC controller 21 is used for logic control of the brick machine, i.e. by controlling the open or closed state of the cartridge valve group 13, thereby realizing actions of different process stages. The programmable safety relay 22 is used for safety protection control of the brick machine by maintaining the safety valve block 14 with position feedback in a normally open state so that the safety valve block 14 does not participate in the relevant logic control of the brick machine.
When the brick machine works and any one of the safety protection device groups 23 is triggered or the safety valve position feedback signal is not received yet, the PLC 21 stops outputting the first safety signal, so that the power source stops running and the cartridge valve group 13 is closed; meanwhile, the programmable safety relay 22 stops outputting the second safety signal, and closes the safety valve group 14, so that the power source 11 is isolated from the control valve group 12, the safety of the brick machine and operators is ensured, and the reliability of the brick machine is improved.
Referring to fig. 4, fig. 4 shows a specific structure of a hydraulic system in a safety system of the automatic refractory brick hydraulic press according to the present invention, wherein the power source includes a first power pump P1, a second power pump P2, a third power pump P3 and an accumulator; the control valve group 12 comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group; the cartridge valve group 13 comprises a first cartridge valve V1, a second cartridge valve V2, a sixth cartridge valve V6 and a seventh cartridge valve V7; the safety valve group 14 comprises a third safety valve V3 with position feedback, a fourth safety valve V4 with position feedback and a fifth safety valve V5 with position feedback; the oil outlet of the first cartridge valve V1 is communicated with the lower movable beam control valve bank, the oil outlet of the second cartridge valve V2 is communicated with the lower movable beam control valve bank, the oil inlet of the third safety valve V3 is communicated with the third power pump P3 and the energy accumulator, the oil outlet of the third safety valve V3 is communicated with the skip control valve bank, the oil inlet of the fourth safety valve V4 is communicated with the first power pump P1 and the second power pump P2, the oil outlet of the fourth safety valve V4 is communicated with the second cartridge valve V2 and the seventh cartridge valve V7, the oil inlet of the fifth safety valve V5 is communicated with the third power pump P3 and the energy accumulator, the oil outlet of the fifth safety valve V5 is communicated with the first cartridge valve V1 and the sixth cartridge valve V6, the oil outlet of the sixth cartridge valve V6 is communicated with the upper movable beam control valve bank, and the oil outlet of the seventh cartridge valve V7 is communicated with the main cylinder control valve bank.
Compared with the prior art, the hydraulic system of the patent is additionally provided with the fourth safety valve V4 and the fifth safety valve V5 with position feedback, and the original cartridge valve V3' is changed into the third safety valve V3 with position feedback. The third safety valve V3, the fourth safety valve V4 and the fifth safety valve V5 are kept in a normally open state in the automatic movement process of the brick machine and do not participate in logic control, and only when the brick machine is abnormal, the third safety valve V3, the fourth safety valve V4 and the fifth safety valve V5 are closed, so that the power source 11 is isolated from the control valve group 12, and the safety of the brick machine and operators is ensured; therefore, when the brick machine works, the programmable safety relay 22 can keep the third safety valve V3, the fourth safety valve V4 and the fifth safety valve V5 with position feedback normally open by controlling the power supply of the third electromagnetic valve YV3, the fourth electromagnetic valve YV4 and the fifth electromagnetic valve YV5 to be on, and does not participate in the related logic control of the brick machine. The first cartridge valve V1, the second cartridge valve V2, the sixth cartridge valve V6 and the seventh cartridge valve V7 participate in logic control, i.e. the actions of different process stages are realized by controlling the working states of the first cartridge valve V1, the second cartridge valve V2, the sixth cartridge valve V6 and the seventh cartridge valve V7; therefore, when the brick press works, the PLC controller 21 is used for logic control, that is, by controlling the energization or the de-energization of the first electromagnetic valve YV1, the second electromagnetic valve YV2, the sixth electromagnetic valve YV6 and the seventh electromagnetic valve YV7, so as to control the opening or the closing of the first cartridge valve V1, the second cartridge valve V2, the sixth cartridge valve V6 and the seventh cartridge valve V7, thereby realizing the actions of different process stages.
Referring to fig. 5, fig. 5 shows a specific structure of the control system 2 in the safety system 100 of the automatic refractory brick hydraulic press according to the present invention, specifically, the safety protection device group 23 includes a limit protector SE1, a scram switch, an SB1 safety gate switch SQ1, and a safety grating SG1. The limit protector SE1 is used for limiting and protecting the brick machine mechanically, and the scram switch SB1, the safety gate switch SQ1 and the safety grating SG1 are all used for safety protection. The limit protector SE1 is connected to the PLC 21, and the emergency stop switch SB1, the safety gate switch SQ1 and the safety grating SG1 are connected to the programmable safety relay 22.
The PLC 21 outputs a first safety signal according to the limit protector SE1 signal and the scram switch SB1 signal, and controls the working state of the cartridge valve group 13 according to the first safety signal; the programmable safety relay 22 outputs a second safety signal according to the limit protector SE1 signal, the scram switch SB1 signal, the safety gate switch SQ1 signal, the safety grating SG1 signal and the safety valve position feedback signal, and controls the working state of the safety valve group 14 according to the second safety signal.
When neither the limit protector SE1 nor the emergency stop switch SB1 is triggered, the PLC controller 21 outputs the first safety signal. When the input signals of the safety gate switch SQ1 and the safety grating SG1 are normal and the condition of outputting the first safety signal is satisfied (i.e., when neither the limit protector SE1 nor the emergency stop switch SB1 is triggered), the programmable safety relay 22 outputs the second safety signal, after a certain time delay, if the safety valve position feedback signal is not received yet, the programmable safety relay 22 stops outputting the second safety signal; therefore, when the first safety signal and the second safety signal are output normally, the brick press can operate normally.
In the brick machine operation, if any one of the limit protector SE1, the scram switch SB1, the safety gate switch SQ1 or the safety grating SG1 is triggered, or if no feedback signal of the safety valve is received, the PLC controller 21 will stop outputting the first safety signal, so as to unload the accumulator, and the first power pump P1, the second power pump P2 and the third power pump P3 stop running; meanwhile, the programmable safety relay 22 stops outputting the second safety signal, i.e. the third electromagnetic valve YV3, the fourth electromagnetic valve YV4 and the fifth electromagnetic valve YV5 are disconnected, the third safety valve V3, the fourth safety valve V4 and the fifth safety valve V5 with position feedback are closed, and at this time, the safety valve group 14 (the third safety valve V3, the fourth safety valve V4 and the fifth safety valve V5) isolates the power source 11 of the hydraulic system 1 from the control valve group 12 of the hydraulic system 1, thereby ensuring the safety of the brick press and operators and improving the reliability of the brick press.
Further, the invention is also provided with a sensor S1 connected with the PLC controller 21, wherein the sensor S1 is used for detecting the running position and state of the brick machine.
Accordingly, the safety valve position feedback signal is also output to the PLC controller 21. Specifically, when the programmable safety relay 22 stops outputting the second safety signal, the safety valve group 14 simultaneously feeds back the safety valve feedback signal to the PLC controller 21 for use as an alarm prompt.
In addition, the signal transmission is performed between the PLC controller 21 and the programmable safety relay 22 through a communication line, so that the signal exchange between the PLC controller 21 and the programmable safety relay 22 is realized.
In summary, the safety valve group 14 with position feedback is added between the power source 11 and the control valve group 12 of the hydraulic system 1, so that the cartridge valve group 13 and the safety valve group 14 work respectively, logic control in the running process of the brick machine can be realized through the cartridge valve group 13 to meet the actual process requirement, and whether the safety valve group 14 works normally or not can be judged through the feedback signal of the safety valve group 14 to realize safety protection control of the brick machine; meanwhile, the programmable safety relay 22 is added, so that the PLC controller 21 and the programmable safety relay 22 work respectively, the plug-in valve group 13 can be controlled by the PLC controller 21 to realize logic control of the operation of the brick press, the safety valve group 14 can be controlled by the programmable safety relay 22 to realize safety protection control of the brick press, and the power source 11 of the hydraulic system 1 can be effectively isolated from the control valve group 12 in an emergency, so that potential safety hazards are avoided.
Referring to FIG. 6, FIG. 6 shows a first embodiment flow chart of a safety method of an automatic hydraulic refractory brick press of the present invention, comprising:
s101, a PLC outputs a first safety signal according to a signal of a safety protection device group, and controls the working state of a cartridge valve group according to the first safety signal;
s102, the programmable safety relay outputs a second safety signal according to the signal of the safety protection equipment group and the safety valve position feedback signal, and controls the working state of the safety valve group according to the second safety signal.
The hydraulic system comprises a power source, a control valve group, a cartridge valve group and a safety valve group with position feedback, wherein the power source is connected with the control valve group through the cartridge valve group and the safety valve group; the control system comprises a PLC controller, a programmable safety relay and a safety protection device group, wherein the safety protection device group comprises at least one safety protection device, and the safety protection device is respectively communicated with the PLC controller and/or the programmable safety relay.
When the brick press works, when safety protection equipment communicated with the PLC is not triggered, the PLC outputs a first safety signal; meanwhile, when the output signal of the safety protection device communicating with the programmable safety relay is normal and the safety protection device communicating with the PLC is not triggered, the programmable safety relay outputs a second safety signal, after the programmable safety relay outputs the second safety signal, after a certain time delay, if the programmable safety relay does not receive the safety valve position feedback signal yet, the programmable safety relay stops outputting the second safety signal; therefore, when the first safety signal and the second safety signal are output normally, the brick press can operate normally.
Compared with the prior art, the hydraulic system provided by the invention is additionally provided with the safety valve group with position feedback. In the invention, the PLC is used for logic control of the brick machine, namely, the opening or closing state of the cartridge valve group is controlled, so that actions of different process stages are realized. The programmable safety relay is used for safety protection control of the brick machine, namely, the safety valve group with position feedback is kept in a normally open state, so that the safety valve group does not participate in relevant logic control of the brick machine.
When the brick machine works, when any one of the safety protection equipment sets is triggered or the safety valve position feedback signal is not received yet, the PLC controller stops outputting the first safety signal and stops the operation of the power source by controlling the working state of the cartridge valve set; meanwhile, the programmable safety relay stops outputting the second safety signal, and closes the safety valve group, so that the power source is isolated from the control valve group, the safety of the brick machine and operators is ensured, and the reliability of the brick machine is improved.
Correspondingly, the safety valve position feedback signal is also output to the PLC. Specifically, when the programmable safety relay stops outputting the second safety signal, the safety valve group feeds back the feedback signal of the safety valve to the PLC at the same time, and the safety valve group is used as an alarm prompt.
In addition, signal transmission is carried out between the PLC controller and the programmable safety relay through a communication line, so that signal exchange between the PLC controller and the programmable safety relay is realized.
Further, the power source comprises a first power pump, a second power pump, a third power pump and an energy accumulator; the control valve group comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group; the cartridge valve group comprises a first cartridge valve, a second cartridge valve, a sixth cartridge valve and a seventh cartridge valve; the safety valve group comprises a third safety valve with position feedback, a fourth safety valve with position feedback and a fifth safety valve with position feedback; the oil outlet of the first cartridge valve is communicated with the lower movable beam control valve bank, the oil outlet of the second cartridge valve is communicated with the lower movable beam control valve bank, the oil inlet of the third safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the third safety valve is communicated with the skip car control valve bank, the oil inlet of the fourth safety valve is communicated with the first power pump and the second power pump, the oil outlet of the fourth safety valve is communicated with the second cartridge valve and the seventh cartridge valve, the oil inlet of the fifth safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the fifth safety valve is communicated with the first cartridge valve and the sixth cartridge valve, the oil outlet of the sixth cartridge valve is communicated with the upper movable beam control valve bank, and the oil outlet of the seventh cartridge valve is communicated with the main oil cylinder control valve bank.
Compared with the prior art, the hydraulic system of the patent is additionally provided with the fourth safety valve and the fifth safety valve with position feedback, and the original cartridge valve V3' is changed into the third safety valve with position feedback. The third safety valve, the fourth safety valve and the fifth safety valve are kept in a normally open state in the automatic movement process of the brick machine and do not participate in logic control, and only when the brick machine is abnormal, the third safety valve, the fourth safety valve and the fifth safety valve are closed, so that a power source is isolated from the control valve group, and the safety of the brick machine and operators is ensured; therefore, when the brick press works, the programmable safety relay can keep the third safety valve V3, the fourth safety valve V4 and the fifth safety valve V5 with position feedback normally open by controlling the power supply of the third electromagnetic valve YV3, the fourth electromagnetic valve YV4 and the fifth electromagnetic valve YV5 to be on, and does not participate in the related logic control of the brick press work. The first cartridge valve, the second cartridge valve, the sixth cartridge valve and the seventh cartridge valve participate in logic control, namely, the actions of different process stages are realized by controlling the working states of the first cartridge valve, the second cartridge valve, the sixth cartridge valve and the seventh cartridge valve; therefore, when the brick press works, the PLC is used for logic control, namely, the opening or closing of the first cartridge valve V1, the second cartridge valve V2, the sixth cartridge valve V6 and the seventh cartridge valve V7 is controlled by controlling the energization or the outage of the first electromagnetic valve YV1, the second electromagnetic valve YV2, the sixth electromagnetic valve YV6 and the seventh electromagnetic valve YV7, so that the actions of different process stages are realized.
Referring to FIG. 7, FIG. 7 shows a flow chart of a second embodiment of a safety method of an automatic hydraulic refractory brick press of the present invention, comprising:
s201, the PLC outputs a first safety signal according to a limit protector signal and an emergency stop switch signal, and controls the working state of the cartridge valve group according to the first safety signal;
s202, the programmable safety relay outputs a second safety signal according to the limit protector signal, the emergency stop switch signal, the safety gate switch signal, the safety grating signal and the safety valve position feedback signal, and controls the working state of the safety valve group according to the second safety signal.
It should be noted that the safety protection device set in the present invention includes a limit protector, an emergency stop switch, a safety door switch and a safety grating. The limit protector is used for limiting and protecting the brick machine mechanically, and the scram switch, the safety door switch and the safety grating are all used for protecting safety. The limit protector is connected with the PLC controller, and the emergency stop switch, the safety gate switch and the safety grating are connected with the programmable safety relay.
When the limit protector and the emergency stop switch are not triggered, the PLC controller outputs a first safety signal. When the safety gate switch and the safety grating input signals are normal and simultaneously meet the condition of outputting the first safety signal (namely, when the limit protector and the emergency stop switch are not triggered), the programmable safety relay outputs a second safety signal, after the programmable safety relay outputs the second safety signal, after a certain time delay, if the programmable safety relay is not subjected to the safety valve position feedback signal, the programmable safety relay stops outputting the second safety signal; therefore, when the first safety signal and the second safety signal are output normally, the brick press can operate normally.
When the brick machine works, such as any one of a limit protector, an emergency stop switch, a safety gate switch or a safety grating is triggered, or a feedback signal of the safety valve is not received, the PLC controller stops outputting a first safety signal to unload the energy accumulator, and the first power pump P1, the second power pump P2 and the third power pump P3 stop running; meanwhile, the programmable safety relay stops outputting the second safety signal, namely, the power supplies of the third electromagnetic valve YV3, the fourth electromagnetic valve YV4 and the fifth electromagnetic valve YV5 are disconnected, the third safety valve, the fourth safety valve and the fifth safety valve with position feedback are closed, at the moment, the safety valve group (the third safety valve, the fourth safety valve and the fifth safety valve) isolates the power source of the hydraulic system from the control valve group of the hydraulic system, the safety of a brick press and operators is ensured, and the reliability of the brick press is improved.
Further, the invention is also provided with a sensor S1 connected with the PLC controller, and the sensor is used for detecting the running position and state of the brick machine.
From the above, the invention has the following beneficial effects:
according to the invention, the safety valve group with position feedback is added between the power source of the hydraulic system and the control valve group, so that the cartridge valve group and the safety valve group work respectively, the logic control in the running process of the brick machine can be realized through the cartridge valve group to meet the actual process requirements, and whether the safety valve group works normally or not can be judged through the feedback signal of the safety valve group to realize the safety protection control of the brick machine;
the programmable safety relay is added, so that the PLC and the programmable safety relay work respectively, the plug-in valve group can be controlled by the PLC to realize logic control of the operation of the brick press, the safety valve group can be controlled by the programmable safety relay to realize safety protection control of the brick press, the power source of the hydraulic system can be effectively ensured to be isolated from the control valve group under emergency, and potential safety hazards are avoided.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. A safety system of an automatic hydraulic press for refractory bricks comprises a hydraulic system and a control system, and is characterized in that,
the hydraulic system comprises a power source, a control valve bank, a cartridge valve bank and a safety valve bank with position feedback, wherein the power source is connected with the control valve bank through the cartridge valve bank and the safety valve bank;
the control system comprises a PLC controller, a programmable safety relay and a safety protection equipment group;
the PLC controller outputs a first safety signal according to the signal of the safety protection equipment set and controls the working state of the cartridge valve set according to the first safety signal, and the programmable safety relay outputs a second safety signal according to the signal of the safety protection equipment set and the position feedback signal of the safety valve and controls the working state of the safety valve set according to the second safety signal;
the power source comprises a first power pump, a second power pump, a third power pump and an energy accumulator; the control valve group comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group; the cartridge valve group comprises a first cartridge valve, a second cartridge valve, a sixth cartridge valve and a seventh cartridge valve; the safety valve group comprises a third safety valve with position feedback, a fourth safety valve with position feedback and a fifth safety valve with position feedback;
the oil outlet of the first cartridge valve is communicated with the lower movable beam control valve bank, the oil outlet of the second cartridge valve is communicated with the lower movable beam control valve bank, the oil inlet of the third safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the third safety valve is communicated with the skip car control valve bank, the oil inlet of the fourth safety valve is communicated with the first power pump and the second power pump, the oil outlet of the fourth safety valve is communicated with the second cartridge valve and the seventh cartridge valve, the oil inlet of the fifth safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the fifth safety valve is communicated with the first cartridge valve and the sixth cartridge valve, the oil outlet of the sixth cartridge valve is communicated with the upper movable beam control valve bank, and the oil outlet of the seventh cartridge valve is communicated with the main oil cylinder control valve bank.
2. The safety system of an automatic hydraulic refractory brick press according to claim 1, wherein the safety protection equipment set comprises a limit protector, a scram switch, a safety gate switch and a safety grating, wherein the limit protector is connected to a PLC controller, and the scram switch, the safety gate switch and the safety grating are connected to a programmable safety relay.
3. A safety system for an automatic hydraulic refractory brick press as defined in claim 2,
the PLC outputs a first safety signal according to the limit protector signal and the scram switch signal, and controls the working state of the cartridge valve group according to the first safety signal;
the programmable safety relay outputs a second safety signal according to the limit protector signal, the emergency stop switch signal, the safety gate switch signal, the safety grating signal and the safety valve position feedback signal, and controls the working state of the safety valve group according to the second safety signal.
4. The safety system of an automatic hydraulic refractory brick press of claim 1, wherein the safety valve position feedback signal is also output to a PLC controller.
5. The safety system of an automatic hydraulic refractory brick press according to claim 1, wherein the PLC controller and the programmable safety relay are in signal transmission via a communication line.
6. A safety method of an automatic hydraulic press for refractory bricks, comprising:
the PLC outputs a first safety signal according to the signal of the safety protection equipment group, and controls the working state of the cartridge valve group according to the first safety signal;
the programmable safety relay outputs a second safety signal according to the signal of the safety protection equipment set and the position feedback signal of the safety valve, and controls the working state of the safety valve set according to the second safety signal, wherein the cartridge valve set and the safety valve set are used for connecting a power source and the control valve set;
the power source comprises a first power pump, a second power pump, a third power pump and an energy accumulator; the control valve group comprises an upper movable beam control valve group, a lower movable beam control valve group, a main oil cylinder control valve group and a skip car control valve group; the cartridge valve group comprises a first cartridge valve, a second cartridge valve, a sixth cartridge valve and a seventh cartridge valve; the safety valve group comprises a third safety valve with position feedback, a fourth safety valve with position feedback and a fifth safety valve with position feedback;
the oil outlet of the first cartridge valve is communicated with the lower movable beam control valve bank, the oil outlet of the second cartridge valve is communicated with the lower movable beam control valve bank, the oil inlet of the third safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the third safety valve is communicated with the skip car control valve bank, the oil inlet of the fourth safety valve is communicated with the first power pump and the second power pump, the oil outlet of the fourth safety valve is communicated with the second cartridge valve and the seventh cartridge valve, the oil inlet of the fifth safety valve is communicated with the third power pump and the energy accumulator, the oil outlet of the fifth safety valve is communicated with the first cartridge valve and the sixth cartridge valve, the oil outlet of the sixth cartridge valve is communicated with the upper movable beam control valve bank, and the oil outlet of the seventh cartridge valve is communicated with the main oil cylinder control valve bank.
7. The method of claim 6, wherein the safety protection equipment set comprises a limit protector, a scram switch, a safety gate switch and a safety grating;
the PLC outputs a first safety signal according to the limit protector signal and the scram switch signal, and controls the working state of the cartridge valve group according to the first safety signal;
the programmable safety relay outputs a second safety signal according to the limit protector signal, the emergency stop switch signal, the safety gate switch signal, the safety grating signal and the safety valve position feedback signal, and controls the working state of the safety valve group according to the second safety signal.
8. The method of claim 6, wherein the safety valve position feedback signal is also output to a PLC controller.
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| CN201810840578.6A CN108799213B (en) | 2018-07-27 | 2018-07-27 | Safety system and method of automatic hydraulic press for refractory bricks |
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| CN108799213A (en) | 2018-11-13 |
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Address after: 528137 No. 25 (C), science and Technology Industrial Zone, Sanshui center, Foshan, Guangdong, China (F4) Applicant after: FOSHAN HENGLITAI MACHINERY Co.,Ltd. Address before: 528137 District C, Sanshui Science and Technology Industrial Zone, Foshan City, Guangdong Province (FA) Applicant before: FOSHAN HENGLITAI MACHINERY Co.,Ltd. |
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