CN103737771A - PLC (Programmable Logic Controller) control system of plastic floor vulcanizing machine and control method thereof - Google Patents
PLC (Programmable Logic Controller) control system of plastic floor vulcanizing machine and control method thereof Download PDFInfo
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- CN103737771A CN103737771A CN201310696888.2A CN201310696888A CN103737771A CN 103737771 A CN103737771 A CN 103737771A CN 201310696888 A CN201310696888 A CN 201310696888A CN 103737771 A CN103737771 A CN 103737771A
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Abstract
The invention discloses a PLC (Programmable Logic Controller) control system of a plastic floor vulcanizing machine and a control method thereof. The PLC control system of the plastic floor vulcanizing machine comprises a fuser, a touch screen, a PLC, a pressure sensor, an A/D (Analogue to Digital) conversion module, a control relay, an alternating current contactor, a thermal overload relay, a temperature controller, a transistor drive panel and a switch power supply. Original relay control is replaced by the PLC, the control method is disclosed, and the purposes of stabilizing the control system and preventing the contactor from being subjected to fusion welding are realized.
Description
Technical field
The present invention relates to plastic floor and generate apparatus field, particularly, relate to a kind of PLC control system and control method thereof for plastic floor vulcanizer.
Background technology
At present, the main manufacture craft of existing plastic floor is for being ground into unit of plastic smalls → plastics ends is mixed according to a certain percentage with stone flour uniform stirring → powder mixing is put to mould suppress for the first time → be pressed into block unit of plastic and unload cooling (big or small because of mould determine) → semi-finished product that suppress are spread to required decorative pattern, the stencil papers such as wood grain suppress → by the semi-finished product of completing decorative pattern suppress for the second time → suppressed unload cooling → through cleaning, upper common paint, flame retardant paint processing (being completed by special production line) → be cut into fritter → chamfering according to required size, burr removing processing → packing and binding.
In whole production process, the pressing process time is longer for the second time, and requires machine that more stable pressure and more stable temperature are provided, and therefore, manufactures the focusing on for the second time on pressing process of vulcanizer.
The rear works entering as shown in Figure 1 according to processing technology setting parameters of having feeded is being that pressure closed loop is controlled to becoming pressing plate baking process.Completing direct weighting after first paragraph pressure process is then the 3rd section of pressure process to second segment pressure process, and in whole pressure maintaining period, Steam Heating is also carried out simultaneously.Existing
The control system of plastic floor vulcanizer adopts Control, causes pressure transient in pressure maintaining period, and ftercompction precision is not high, controls the easy melting welding of contactor of ftercompction motor.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of PLC control system and control method thereof for plastic floor vulcanizer, to realize system stability and to avoid the advantage of contactor melting welding.
For achieving the above object, the technical solution used in the present invention is:
For a PLC control system for plastic floor vulcanizer, comprise fuse, PLC, touch-screen, pressure sensor, A/D modular converter, control relay, A.C. contactor, thermal overload relay, temperature controller, transistor driving plate and Switching Power Supply,
Described fuse, for the short-circuit protection of control system;
Described touch-screen, is connected with PCL by RS485 communication, realizes the I/O monitoring of parameter setting, data monitoring and PLC;
Described PLC is whole control system control centre;
Described pressure sensor, realizes the detection of pressure signal;
Described A/D modular converter, is connected with PLC by integrated wire arrangement, and the input point of A/D modular converter is connected with sensor, after the next analog signal of pressure sensor feeds back is changed into data signal, sends PLC to;
Described control relay, the coil of this control relay is directly connected with PLC output point, by PLC, is directly driven; The normally opened contact of control relay is connected with the normally-closed contact of thermal overload relay;
Described A.C. contactor, for controlling the work of motor; Main contact end of incoming cables is directly opened and is connected with sky, and leading-out terminal is connected with thermal overload relay, and coil is connected with the normally-closed contact of thermal overload relay;
Described thermal overload relay, for the overload protection of vulcanizer motor, end of incoming cables is connected with the leading-out terminal of A.C. contactor, and leading-out terminal is connected with motor, and normally opened contact is connected with PLC input point, and normally-closed contact is connected with the coil of A.C. contactor;
Described temperature controller, for detection of the vapor (steam) temperature of vulcanizer; Input connects K type thermocouple, and output reaches output switching signal while controlling temperature, and the output of temperature controller is connected with the input of PLC, and the switching signal of temperature controller output is controlled the action of the relevant air valve of vulcanizer after PLC processes by PLC;
Described transistor driving plate, the b utmost point of transistor driving plate is connected with PLC output, and the e utmost point of transistor driving plate is connected with Switching Power Supply positive pole, and the c utmost point of transistor driving plate is connected with control relay;
Described Switching Power Supply, provides dc source; The input of Switching Power Supply is connected with fuse, and the output of Switching Power Supply is connected with control relay with touch-screen, PLC, transistor driving plate respectively.
Technical scheme of the present invention also discloses a kind of control method of PLC control system simultaneously, comprises the following steps:
Step 1, to PLC power-up initializing;
Step 2, above-mentioned PLC have judged whether operation requests, and as do not continued standby, if any operation requests, whether be automatically control request, if not being automatic request, transfer manual operation to if detecting;
Step 3, as above-mentioned PLC detects as automatically controlling, start operation of oil pump, master cylinder is pressurized to setup pressure value, described oil pump is divided into speed oil pump and ftercompction oil pump;
Step 4, be pressurized to setting value as master cylinder, air bleeding valve, draining valve, drain valve, the steam that PLC controls plastic floor vulcanizer enters the switching that valve and cooling water enter valve, PLC controls the running of speed oil pump and ftercompction oil pump simultaneously, thereby control master cylinder and be pressurized to setting value, complete plastic floor vulcanizer job control;
Step 5, the above-mentioned oil cylinder that completes plastic floor vulcanizer job control under PLC controls pressure release to being less than setup pressure value.
According to a preferred embodiment of the invention, the setup pressure value in above-mentioned steps 3 and step 5 is 1Mpa.
According to a preferred embodiment of the invention, in above-mentioned steps 4, air bleeding valve, draining valve, drain valve, steam enter the switching that valve and cooling water enter valve and comprise the following steps:
Step 401, by PLC, control draining valve and drain valve is opened, and set the time of opening, timing when opening draining valve and drain valve;
Step 402, as above-mentioned steps 401 timing times arrive, by drain shut valve, drain valve continues to open, steam enters valve and opens, simultaneously setting-up time, and timing simultaneously;
Step 403, as the timing time of above-mentioned steps 402 arrives, open air bleeding valve, close drain valve, steam off enters valve and opens cooling water and enter valve, and setting-up time, timing simultaneously;
Step 404, as the timing time of above-mentioned steps 403 arrives, close air bleeding valve, open draining valve, steam off enters valve and opens cooling water and enter valve, and setting-up time, timing simultaneously;
Step 405, as above-mentioned steps 404 timing times arrive, air bleeding valve, draining valve, drain valve, steam are entered to valve and cooling water and enter valve and all close.
According to a preferred embodiment of the invention, in above-mentioned steps 4, PLC controls the running of speed oil pump and ftercompction oil pump, thereby control master cylinder, is pressurized to setting value, completes plastic floor vulcanizer job control and comprises the following steps:
Step 501, control speed oil pump stop, the operation of ftercompction oil pump, thus be pressurized to the first setup pressure value, while reaching the first setup pressure value, just control ftercompction oil pump and close, and the working time of the first force value is carried out to timing, working time and operating pressure under judgement the first force value;
Working time and operating pressure under the first force value in step 502, above-mentioned steps 501 all meet the requirements, start ftercompction oil pump, thereby be pressurized to the second setup pressure value, while reaching the second setup pressure value, just controlling ftercompction oil pump closes, and the working time of the second force value is carried out to timing, working time and operating pressure under judgement the second force value; Repeat to control ftercompction oil pump until be pressurized to the 4th setup pressure value, complete master cylinder pressurization.
Technical scheme of the present invention has following beneficial effect:
Technical scheme of the present invention, by replace the Control of reason with PLC, and discloses a kind of control method, reaches the object that contactor melting welding is stablized and avoided to control system.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is existing vulcanizer workflow diagram;
Fig. 2 is the flow chart of the PLC control method described in the embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
For a PLC control system for plastic floor vulcanizer, comprise fuse, PLC, touch-screen, pressure sensor, A/D modular converter, control relay, A.C. contactor, thermal overload relay, temperature controller, transistor driving plate and Switching Power Supply,
Fuse, for the short-circuit protection of control system, the device power taking of all use single phase poaer supplies is all through overcurrent fuse (mainly containing PLC, temperature controller, Switching Power Supply), and power taking is in A phase.
Touch-screen, is connected with PCL by RS485 communication, realizes the I/O monitoring of parameter setting, data monitoring and PLC;
PLC is the heart of whole control system, and all motion action, mode of operation selection and oil cylinder limit switch, electric motor protecting detection signal, temperature detection signal are all connected to the input point of PLC; Output point connects the b utmost point (PNP pipe) or the negative pole of control relay that causes transistor driving plate.PLC is also serving as computing, the processing of A/D modular converter data, the monitoring in control time, each action control that pressure is controlled data simultaneously, is control centre.
Pressure sensor is installed on the oily trigger of hydraulic system and is connected with hydraulic cylinder, by pair twist shielded signal line, connects the detection that the input point that causes A/D modular converter realizes pressure.
A/D modular converter is connected with the expansion mouth of PLC by integrated wire arrangement, and the input point of A/D modular converter is connected in sensor, after the next analog signal of pressure sensor feeds back is changed into data signal, sends PLC to.
Control relay plays transitional function, and its coil is DC24V, and relay coil is directly connected with PLC output point, by PLC, is directly driven; The normally opened contact of control relay is connected with the electromagnet of AC220V (being mainly that steam enters valve etc.) and the normally-closed contact of thermal overload relay is connected.
A.C. contactor is for controlling the work of motor; Main contact end of incoming cables is directly opened and is connected with sky, and leading-out terminal is connected with thermal overload relay, and coil is connected with the normally-closed contact of thermal overload relay.
Thermal overload relay is for the overload protection of motor, and end of incoming cables is connected with the leading-out terminal of A.C. contactor, and leading-out terminal is connected with motor, and normally opened contact is connected with PLC input point, and normally-closed contact is connected with the coil of A.C. contactor.
Temperature controller is for detection of vapor (steam) temperature; Input connects K type thermocouple (the installation of TC is on jet chimney), and output reaches while controlling temperature exports a switching signal, therefore output is connected with the input of PLC.The signal that temperature controller sends is controlled the action of relevant air valve after PLC processes by PLC.
Transistor driving plate also plays a transition role; Its function control relay is identical.Its b utmost point is connected with PLC output, and the e utmost point is connected with Switching Power Supply positive pole, and the c utmost point is connected with hydraulic valve electromagnet, working station indicator, control relay.
Switching Power Supply is used to the direct current device power supply of DC24V; Input is connected with fuse, and output is connected with touch-screen, PLC, transistor driving plate, control relay, hydraulic valve work of electromagnet status indicator lamp.
A control method for PLC control system, comprises the following steps:
Step 1, to PLC power-up initializing;
Step 2, above-mentioned PLC have judged whether operation requests, and as do not continued standby, if any operation requests, whether be automatically control request, if not being automatic request, transfer manual operation to if detecting;
Step 3, as above-mentioned PLC detects as automatically controlling, start operation of oil pump, master cylinder is pressurized to setup pressure value, described oil pump is divided into speed oil pump and ftercompction oil pump;
Step 4, be pressurized to setting value as master cylinder, air bleeding valve, draining valve, drain valve, the steam that PLC controls plastic floor vulcanizer enters the switching that valve and cooling water enter valve, PLC controls the running of speed oil pump and ftercompction oil pump simultaneously, thereby control master cylinder and be pressurized to setting value, complete plastic floor vulcanizer job control;
Step 5, the above-mentioned oil cylinder that completes plastic floor vulcanizer job control under PLC controls pressure release to being less than setup pressure value.
Wherein, the setup pressure value in step 3 and step 5 is 1Mpa.
In step 4, air bleeding valve, draining valve, drain valve, steam enter the switching that valve and cooling water enter valve and comprise the following steps:
Step 401, by PLC, control draining valve and drain valve is opened, and set the time of opening, timing when opening draining valve and drain valve;
Step 402, as above-mentioned steps 401 timing times arrive, by drain shut valve, drain valve continues to open, steam enters valve and opens, simultaneously setting-up time, and timing simultaneously;
Step 403, as the timing time of above-mentioned steps 402 arrives, open air bleeding valve, close drain valve, steam off enters valve and opens cooling water and enter valve, and setting-up time, timing simultaneously;
Step 404, as the timing time of above-mentioned steps 403 arrives, close air bleeding valve, open draining valve, steam off enters valve and opens cooling water and enter valve, and setting-up time, timing simultaneously;
Step 405, as above-mentioned steps 404 timing times arrive, air bleeding valve, draining valve, drain valve, steam are entered to valve and cooling water and enter valve and all close.
In step 4, PLC controls the running of speed oil pump and ftercompction oil pump, thereby control master cylinder, is pressurized to setting value, completes plastic floor vulcanizer job control and comprises the following steps:
Step 501, control speed oil pump stop, the operation of ftercompction oil pump, thus be pressurized to the first setup pressure value, while reaching the first setup pressure value, just control ftercompction oil pump and close, and the working time of the first force value is carried out to timing, working time and operating pressure under judgement the first force value;
Working time and operating pressure under the first force value in step 502, above-mentioned steps 501 all meet the requirements, start ftercompction oil pump, thereby be pressurized to the second setup pressure value, while reaching the second setup pressure value, just controlling ftercompction oil pump closes, and the working time of the second force value is carried out to timing, working time and operating pressure under judgement the second force value; Repeat to control ftercompction oil pump until be pressurized to the 4th setup pressure value, complete master cylinder pressurization.
According to manufacture craft, control requirement as follows:
1) whole manufacture craft requires to realize three sections of pressure controls and continuous, and controlled pressure resolution ratio is 0.1Mpa, and surge pressure scope ± 0.3Mpa and fluctuation range can be set (as: first paragraph: 8Mpa, 25Min between 0.1 ~ 0.3; Second segment: 15Mpa, 45Min; The 3rd section: 18Mpa, 12Min);
2) three periods of pressure control times can be set at any time between 0 ~ 99Min99S, and come into force after having set;
3) each pressure setting parameter, time parameter all completes at touch-screen, and will possess power-failure memory;
4) can show in real time board working stage, after each operation completes, can send acousto-optic index signal, board also declines automatically;
5) heating-up temperature can be on temperature controller free setting.
Vulcanizer machine divides left and right sides two parts and symmetrical.The about 600mm(of cylinder diameter of the left and right sides determines according to operating pressure) the about 900mm of piston stroke.The working method of left and right two cylinders is identical, but the ftercompction simultaneously of left and right sides oil cylinder.Is fuel tank in the middle of two oil cylinders, and speed oil pump motor, ftercompction Oil pump electrical machinery, oil circuit conglomerate and control cabinet are arranged on fuel tank.
Oil cylinder and fuel tank all under ground, the about 1.2m of the ground degree of depth.Bearing plate, control cabinet are about 500mm places on level ground.
The operative body of machine divides right side and left side.Mainly by hydraulic cylinder and bearing plate, formed.Hydraulic cylinder mainly provides pressing pressure (pressure require more stable), and bearing plate, for holding the product that needs compacting, is equipped with circulation pipe bearing plate side in the middle of bearing plate, and it is outlet that circulation pipe bearing plate side has a high steam inlet port and one.Circulation pipe bearing plate except need add the additional cooling water of circulation pipe simultaneously also must be cooling in circulation pipe.Wherein the board top of left side operative body is that high steam enters valve and cooling water enters valve.
In control cabinet, mainly by fuse, PLC and A/D modular converter, control relay, A.C. contactor, thermal overload relay, transistor driving plate, Switching Power Supply, formed.
Left side ground edge is air bleeding valve, draining valve, drain valve.
Control cabinet can be realized the manual adjustment of left and right two cylinders and automatically control two kinds of working methods, by the selector switch on guidance panel, selects.
Fuel tank is complete machine hydraulic oil storage and circulation place, for the needs that dispel the heat, so that volume should be selected is larger.The technical program selects volume to be greater than 1m3.
After Control System Design, installation and the programming that the PLC of take is core debugged, the function of machine also can realize, but the control of the oil cylinder working-pressure of machine owes accurate.Arrive accurate pressure and control quite difficulty.Usage ratio valve is easily realized accurate pressure and is controlled, and it is as follows that in debug process, this programme has carried out corresponding improvement:
Improvement to ftercompction motor
To the requirement of ftercompction motor, be can in time pressure be filled when occurring needing ftercompction action.If setting pressure is determined to n, master cylinder actual pressure is m.There is m>(n+0.3 in pressure after ftercompction) be that actual pressure is greater than the setting pressure upper limit, now should carry out release.After pressure-relief valve action, there is m<(n-0.3) actual pressure, now should ftercompction lower than setting pressure lower limit like this.So again and again, contactor frequent movement, motor frequent starting.
In the process of debugging, find that ftercompction motor speed is the key factor that affects pressure controling precision.If ftercompction motor speed is slow, oil pump capacity is low, and ftercompction is slow, and PLC is long detection time, and precision is high.Otherwise precision is low.Just started ftercompction oil pump and adopted 7.5KW 4 utmost point motors, the high oil pump flow of motor speed is large.During ftercompction, be difficult to control flow, use instead after 6 utmost point motors, rotating speed reduces also step-down of flow, and ftercompction speed is slack-off, and pressure controling precision obviously improves.
Hydraulic system is improved
The phenomenon that occurs release excessive velocities in debug process is because the larger reason of pressure-relief valve flow causes.Adoption rate flow valve is controlled cost and can be uprised, and does not therefore consider to use.Now we have adopted following several method to control release speed.
1) depressurized circuit installs choke valve additional; Installing choke valve additional can manual adjustments release speed, has larger flexibility, and release speed can be according to actual conditions adjustment.
2) install damping sheet additional; Make a backing plate and be installed under pressure-relief valve, separately make a call to a through hole less than through hole on valve body and work as throttling use with this on backing plate, this way cost is low.But release speed is non-adjustable, flexibility is not high.
3) in hydraulic control partial design, become backhaul release and work release two parts, two parts work alone.Slow release is used in release while working, can fine controlled pressure.The fast release of rear use of having worked, so just can not affect whole operating efficiency.
Above first and second kinds of methods can play good control action to the speed of release, but the time of release after simultaneously also directly affecting work and completing has still produced impact to whole work efficiency like this.Can consider to adopt in this case third method.
Ftercompction control method is improved
For maintaining metastable pressure, system requirements ftercompction speed, so motor understands frequent starting unavoidably, and motor is that bringing onto load starts.This is just easy to cause motor to damage, and has also affected electrical network line voltage is often fluctuateed.
Because motor needs the regular hour from starting to stable operation.Can consider to be written as electric motor starting and stable operation when coding after, ftercompction magnetic valve just starts action, i.e. magnetic valve deferred action is not with control contactor synchronization action.Load in the time of so both can alleviating electric motor starting, also can reduce the capacity of selecting contactor.Certainly such situation will be seen the design of hydraulic system, and when design of Hydraulic System becomes bringing onto load to start, the capacity of contactor will be selected larger 5 times of being at least rated current.
Selection to ftercompction electric motor protecting device
Ordinary circumstance can be selected thermal overload relay protection motor, but just inapplicable in such occasion.Because motor frequent starting, so we can not ignore probe of contactor welding problems.Just in case occur that contact melting welding is still control contactor disconnection of PLC after ftercompction completes, now due to motor phase failure, although thermal overload can send overload signal, be also of no avail.Therefore, electric motor protecting part should adopt motor heating magnetic circuit breaker and auxiliary contact to replace thermal overload relay as the protection device of motor.
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. the PLC control system for plastic floor vulcanizer, it is characterized in that, comprise fuse, PLC, touch-screen, pressure sensor, A/D modular converter, control relay, A.C. contactor, thermal overload relay, temperature controller, transistor driving plate and Switching Power Supply
Described fuse, for the short-circuit protection of control system;
Described touch-screen, is connected with PCL by RS485 communication, realizes the I/O monitoring of parameter setting, data monitoring and PLC;
Described PLC is whole control system control centre;
Described pressure sensor, realizes the detection of pressure signal;
Described A/D modular converter, is connected with PLC by integrated wire arrangement, and the input point of A/D modular converter is connected with sensor, after the next analog signal of pressure sensor feeds back is changed into data signal, sends PLC to;
Described control relay, the coil of this control relay is directly connected with PLC output point, by PLC, is directly driven; The normally opened contact of control relay is connected with the normally-closed contact of thermal overload relay;
Described A.C. contactor, for controlling the work of motor; Main contact end of incoming cables is directly opened and is connected with sky, and leading-out terminal is connected with thermal overload relay, and coil is connected with the normally-closed contact of thermal overload relay;
Described thermal overload relay, for the overload protection of vulcanizer motor, end of incoming cables is connected with the leading-out terminal of A.C. contactor, and leading-out terminal is connected with motor, and normally opened contact is connected with PLC input point, and normally-closed contact is connected with the coil of A.C. contactor;
Described temperature controller, for detection of the vapor (steam) temperature of vulcanizer; Input connects K type thermocouple, and output reaches output switching signal while controlling temperature, and the output of temperature controller is connected with the input of PLC, and the switching signal of temperature controller output is controlled the action of the relevant air valve of vulcanizer after PLC processes by PLC;
Described transistor driving plate, the b utmost point of transistor driving plate is connected with PLC output, and the e utmost point of transistor driving plate is connected with Switching Power Supply positive pole, and the c utmost point of transistor driving plate is connected with control relay;
Described Switching Power Supply, provides dc source; The input of Switching Power Supply is connected with fuse, and the output of Switching Power Supply is connected with control relay with touch-screen, PLC, transistor driving plate respectively.
2. a control method for PLC control system claimed in claim 1, is characterized in that, comprises the following steps:
Step 1, to PLC power-up initializing;
Step 2, above-mentioned PLC have judged whether operation requests, and as do not continued standby, if any operation requests, whether be automatically control request, if not being automatic request, transfer manual operation to if detecting;
Step 3, as above-mentioned PLC detects as automatically controlling, start operation of oil pump, master cylinder is pressurized to setup pressure value, described oil pump is divided into speed oil pump and ftercompction oil pump;
Step 4, be pressurized to setting value as master cylinder, air bleeding valve, draining valve, drain valve, the steam that PLC controls plastic floor vulcanizer enters the switching that valve and cooling water enter valve, PLC controls the running of speed oil pump and ftercompction oil pump simultaneously, thereby control master cylinder and be pressurized to setting value, complete plastic floor vulcanizer job control;
Step 5, the above-mentioned oil cylinder that completes plastic floor vulcanizer job control under PLC controls pressure release to being less than setup pressure value.
3. the control method of PLC control system according to claim 2, is characterized in that, the setup pressure value in above-mentioned steps 3 and step 5 is 1Mpa.
4. the control method of PLC control system according to claim 3, is characterized in that, in above-mentioned steps 4, air bleeding valve, draining valve, drain valve, steam enter the switching that valve and cooling water enter valve and comprises the following steps:
Step 401, by PLC, control draining valve and drain valve is opened, and set the time of opening, timing when opening draining valve and drain valve;
Step 402, as above-mentioned steps 401 timing times arrive, by drain shut valve, drain valve continues to open, steam enters valve and opens, simultaneously setting-up time, and timing simultaneously;
Step 403, as the timing time of above-mentioned steps 402 arrives, open air bleeding valve, close drain valve, steam off enters valve and opens cooling water and enter valve, and setting-up time, timing simultaneously;
Step 404, as the timing time of above-mentioned steps 403 arrives, close air bleeding valve, open draining valve, steam off enters valve and opens cooling water and enter valve, and setting-up time, timing simultaneously;
Step 405, as above-mentioned steps 404 timing times arrive, air bleeding valve, draining valve, drain valve, steam are entered to valve and cooling water and enter valve and all close.
5. the control method of PLC control system according to claim 3, it is characterized in that, in above-mentioned steps 4, PLC controls the running of speed oil pump and ftercompction oil pump, thereby control master cylinder, is pressurized to setting value, completes plastic floor vulcanizer job control and comprises the following steps:
Step 501, control speed oil pump stop, the operation of ftercompction oil pump, thus be pressurized to the first setup pressure value, while reaching the first setup pressure value, just control ftercompction oil pump and close, and the working time of the first force value is carried out to timing, working time and operating pressure under judgement the first force value;
Working time and operating pressure under the first force value in step 502, above-mentioned steps 501 all meet the requirements, start ftercompction oil pump, thereby be pressurized to the second setup pressure value, while reaching the second setup pressure value, just controlling ftercompction oil pump closes, and the working time of the second force value is carried out to timing, working time and operating pressure under judgement the second force value; Repeat to control ftercompction oil pump until be pressurized to the 4th setup pressure value, complete master cylinder pressurization.
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| CN103737771B (en) | 2016-01-20 |
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