CN103737771B - For PLC control system and the control method thereof of plastic floor vulcanizer - Google Patents

Abstract

The invention discloses a kind of PLC control system for plastic floor vulcanizer and control method thereof, for the PLC control system of plastic floor vulcanizer, comprise fuse, touch-screen, PLC, pressure sensor, A/D modular converter, control relay, A.C. contactor, thermal overload relay, temperature controller, transistor driving plate and Switching Power Supply.By replacing former Control with PLC, and disclosing a kind of control method, reaching control system and stablizing and the object avoiding contactor melting welding.

Description

PLC control system and control method for plastic floor vulcanizing machine

technical field

The invention relates to the field of plastic floor production equipment, in particular to a PLC control system for a plastic floor vulcanizing machine and a control method thereof.

Background technique

At present, the main production process of the existing plastic floor is to crush the plastic block into fine powder → mix the plastic powder and stone powder in a certain proportion and stir evenly → put the mixed powder on the mold for the first pressing → press into a block The plastic block is unloaded and cooled (the size depends on the mold) → spread the pressed semi-finished product with the required pattern, wood grain and other pattern paper for pressing → press the semi-finished product with the pattern for the second time → unload and cool after pressing →After cleaning, ordinary paint, flame retardant paint treatment (completed by a special production line)→cut into small pieces according to the required size→chamfering, deburring treatment→packing box.

The second pressing process takes a long time in the whole production process, and the machine is required to provide relatively stable pressure and temperature. Therefore, the focus of manufacturing vulcanizers is on the second pressing process.

After the loading is completed, various parameters are set according to the processing technology to enter the process shown in Figure 1. The process of heating and vulcanizing the forming platen is pressure closed-loop control. After the first stage of pressure process is completed, it is directly pressurized to the second stage of pressure process, followed by the third stage of pressure process, and steam heating is also carried out during the entire pressure maintaining process. current

The control system of the plastic floor vulcanizing machine is controlled by a relay, which causes the pressure to be unstable during the pressure maintaining process, the precision of the pressure supplement is not high, and the contactor controlling the pressure supplement motor is easy to weld.

Contents of the invention

The purpose of the present invention is to solve the above problems and propose a PLC control system and control method for plastic floor vulcanizing machines, so as to realize the advantages of system stability and avoid contactor welding.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A PLC control system for plastic floor vulcanizing machine, including fuse, PLC, touch screen, pressure sensor, A/D conversion module, control relay, AC contactor, thermal overload relay, temperature controller, transistor driver board and switch power supply,

The fuse is used for short circuit protection of the control system;

The touch screen is connected with PCL through RS485 communication to realize parameter setting, data monitoring and I/O monitoring of PLC;

The PLC is the control center of the entire control system;

The pressure sensor realizes the detection of the pressure signal;

The A/D conversion module is connected to the PLC through an integrated cable, the input point of the A/D conversion module is connected to the sensor, and is used to convert the analog signal fed back by the pressure sensor into a digital signal and then transmit it to the PLC;

In the control relay, the coil of the control relay is directly connected to the PLC output point and is directly driven by the PLC; the normally open contact of the control relay is connected with the normally closed contact of the thermal overload relay;

The AC contactor is used to control the operation of the motor; the incoming line end of the main contact is directly connected to the air switch, the outgoing line end is connected to the thermal overload relay, and the coil is connected to the normally closed contact of the thermal overload relay;

The thermal overload relay is used for overload protection of the vulcanizing machine motor, the incoming line end is connected to the outgoing line end of the AC contactor, the outgoing line end is connected to the motor, the normally open contact is connected to the PLC input point, and the normally closed contact is connected to the AC contactor The coil of the device is connected;

The temperature controller is used to detect the steam temperature of the vulcanizer; the input end is connected to a K-type thermocouple, and the output end outputs a switch signal when it reaches the control temperature, the output end of the temperature controller is connected with the input end of the PLC, and the temperature controller outputs After the switching signal of the PLC is processed by the PLC, the action of the relevant air valve of the vulcanizing machine is controlled by the PLC;

In the transistor driver board, the b pole of the transistor driver board is connected with the PLC output terminal, the e pole of the transistor driver board is connected with the positive pole of the switching power supply, and the c pole of the transistor driver board is connected with the control relay;

The switching power supply provides a DC power supply; the input end of the switching power supply is connected with a fuse, and the output end of the switching power supply is respectively connected with a touch screen, a PLC, a transistor drive board and a control relay.

Simultaneously technical scheme of the present invention also discloses a kind of control method of PLC control system, comprises the following steps:

Step 1. Power on and initialize the PLC;

Step 2, the above-mentioned PLC judges whether there is an operation request, if not, continues to stand by, if there is an operation request, then detects whether it is an automatic control request, if not an automatic request, then turns to manual operation;

Step 3, if the above-mentioned PLC detects that it is automatic control, then start the oil pump to work, pressurize the master cylinder to the set pressure value, and the oil pump is divided into a fast oil pump and a pressure boost oil pump;

Step 4. If the main cylinder is pressurized to the set value, the PLC controls the opening and closing of the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve of the plastic floor vulcanizer. The operation of the pressure oil pump, so as to control the pressure of the main cylinder to the set value, and complete the work control of the plastic floor vulcanizing machine;

Step 5. The above-mentioned oil cylinder that has completed the work control of the plastic floor vulcanizing machine is decompressed to less than the set pressure value under the control of PLC.

According to a preferred embodiment of the present invention, the set pressure values in the above step 3 and step 5 are both 1Mpa.

According to a preferred embodiment of the present invention, the opening and closing of the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve in the above step 4 includes the following steps:

Step 401, controlling the opening of the drain valve and steam trap through the PLC, and setting the opening time, and timing while opening the drain valve and steam trap;

Step 402, if the timing is up in the above step 401, then close the drain valve, continue to open the steam trap, open the steam inlet valve, set the time at the same time, and count at the same time;

Step 403, as the timing time of the above-mentioned step 402 is up, then open the exhaust valve, close the steam trap, close the steam inlet valve and open the cooling water inlet valve, and set the time and time at the same time;

Step 404, if the timing time of the above step 403 is up, then close the exhaust valve, open the drain valve, close the steam inlet valve and open the cooling water inlet valve, set the time, and count at the same time;

Step 405, when the timing of the above-mentioned step 404 expires, close the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve.

According to a preferred embodiment of the present invention, in the above step 4, the PLC controls the operation of the fast oil pump and the booster oil pump, thereby controlling the pressurization of the master cylinder to a set value, and completing the work control of the plastic floor vulcanizing machine includes the following steps:

Step 501, control the fast oil pump to stop, and the boost oil pump to operate, thereby pressurizing to the first set pressure value, and when the first set pressure value is reached, control the boost oil pump to turn off, and check the working time of the first pressure value Timing, judging the working time and working pressure under the first pressure value;

Step 502, the working time and working pressure at the first pressure value in the above step 501 meet the requirements, then start the booster oil pump to pressurize to the second set pressure value, and when the second set pressure value is reached, the Control the boost oil pump to close, and count the working time of the second pressure value, and judge the working time and working pressure under the second pressure value; repeat the control of the boost oil pump until it is pressurized to the fourth set pressure value, and the master cylinder is completed. Pressurize.

The technical solution of the present invention has the following beneficial effects:

The technical scheme of the present invention uses PLC to replace the relay control of the cause, and discloses a control method, so as to achieve the purpose of stabilizing the control system and avoiding contactor welding.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is the working flow diagram of existing vulcanizer;

Fig. 2 is a flow chart of the PLC control method described in the embodiment of the present invention.

detailed description

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

A PLC control system for plastic floor vulcanizing machine, including fuse, PLC, touch screen, pressure sensor, A/D conversion module, control relay, AC contactor, thermal overload relay, temperature controller, transistor driver board and switch power supply,

The fuse is used for short-circuit protection of the control system. All devices that use single-phase power supply are powered through the fuse (mainly PLC, thermostat, switching power supply), and the power is taken from phase A.

Touch screen, connected to PCL through RS485 communication, to realize parameter setting, data monitoring and PLC I/O monitoring;

PLC is the heart of the entire control system. All action operations, work mode selection, and oil cylinder limit switches, motor protection detection signals, and temperature detection signals are connected to the input points of the PLC; the output points are connected to the b pole of the transistor driver board ( PNP tube) or the negative pole of the control relay. At the same time, PLC is also responsible for the calculation of pressure control data, the processing of A/D conversion module data, the monitoring of control time, and the control of various actions. It is the control center.

The pressure sensor is installed on the oil switch plate of the hydraulic system and communicated with the hydraulic cylinder, and is connected to the input point of the A/D conversion module through twisted shielded signal lines to realize pressure detection.

The A/D conversion module is connected to the expansion port of the PLC through the integrated cable, and the input point of the A/D conversion module is connected to the sensor, which is used to convert the analog signal fed back by the pressure sensor into a digital signal and then send it to the PLC.

The control relay plays a transitional role, and its coil is DC24V. The relay coil is directly connected to the PLC output point and is directly driven by the PLC; the normally open contact of the control relay is connected to the AC220V electromagnet (mainly the steam inlet valve, etc.) The normally closed contacts of the overload relay are connected.

The AC contactor is used to control the operation of the motor; the main contact input terminal is directly connected to the air switch, the output terminal is connected to the thermal overload relay, and the coil is connected to the normally closed contact of the thermal overload relay.

The thermal overload relay is used for the overload protection of the motor. The incoming terminal is connected to the outgoing terminal of the AC contactor, the outgoing terminal is connected to the motor, the normally open contact is connected to the PLC input point, and the normally closed contact is connected to the coil of the AC contactor.

The temperature controller is used to detect the steam temperature; the input end is connected to a K-type thermocouple (the thermocouple is installed on the steam pipe), and the output end outputs a switch signal when the control temperature is reached, so the output end is connected to the input end of the PLC. After the signal sent by the thermostat is processed by the PLC, the PLC controls the action of the relevant air valve.

The transistor driver board also plays a transitional role; its function is the same as that of the control relay. The b pole is connected to the PLC output terminal, the e pole is connected to the positive pole of the switching power supply, and the c pole is connected to the hydraulic valve electromagnet, the working status indicator light and the control relay.

The switching power supply is used to supply power for DC24V DC devices; the input end is connected to the fuse, and the output end is connected to the touch screen, PLC, transistor driver board, control relay, and hydraulic valve electromagnet working status indicator.

A control method for a PLC control system, comprising the following steps:

Step 1. Power on and initialize the PLC;

Step 2, the above-mentioned PLC judges whether there is an operation request, if not, continues to stand by, if there is an operation request, then detects whether it is an automatic control request, if not an automatic request, then turns to manual operation;

Step 3, if the above-mentioned PLC detects that it is automatic control, then start the oil pump to work, pressurize the master cylinder to the set pressure value, and the oil pump is divided into a fast oil pump and a pressure boost oil pump;

Step 4. If the main cylinder is pressurized to the set value, the PLC controls the opening and closing of the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve of the plastic floor vulcanizer. The operation of the pressure oil pump, so as to control the pressure of the main cylinder to the set value, and complete the work control of the plastic floor vulcanizing machine;

Step 5. The above-mentioned oil cylinder that has completed the work control of the plastic floor vulcanizing machine is decompressed to less than the set pressure value under the control of PLC.

Wherein, the set pressure values in step 3 and step 5 are both 1Mpa.

The opening and closing of the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve in step 4 includes the following steps:

Step 401, controlling the opening of the drain valve and steam trap through the PLC, and setting the opening time, and timing while opening the drain valve and steam trap;

Step 402, if the timing is up in the above step 401, then close the drain valve, continue to open the steam trap, open the steam inlet valve, set the time at the same time, and count at the same time;

Step 403, as the timing time of the above-mentioned step 402 is up, then open the exhaust valve, close the steam trap, close the steam inlet valve and open the cooling water inlet valve, and set the time and time at the same time;

Step 404, if the timing time of the above step 403 is up, then close the exhaust valve, open the drain valve, close the steam inlet valve and open the cooling water inlet valve, set the time, and count at the same time;

Step 405, when the timing of the above-mentioned step 404 expires, close the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve.

In step 4, the PLC controls the operation of the fast oil pump and the boost oil pump, thereby controlling the pressure of the master cylinder to the set value, and completing the work control of the plastic floor vulcanizing machine includes the following steps:

Step 501, control the fast oil pump to stop, and the boost oil pump to operate, thereby pressurizing to the first set pressure value, and when the first set pressure value is reached, control the boost oil pump to turn off, and check the working time of the first pressure value Timing, judging the working time and working pressure under the first pressure value;

Step 502, the working time and working pressure at the first pressure value in the above step 501 meet the requirements, then start the booster oil pump to pressurize to the second set pressure value, and when the second set pressure value is reached, the Control the boost oil pump to close, and count the working time of the second pressure value, and judge the working time and working pressure under the second pressure value; repeat the control of the boost oil pump until it is pressurized to the fourth set pressure value, and the master cylinder is completed. Pressurize.

According to the production process control requirements are as follows:

1) The whole production process requires three-stage pressure control and continuous, the control pressure resolution is 0.1Mpa, the fluctuating pressure range is ±0.3Mpa and the fluctuating range can be set between 0.1~0.3 (such as: the first stage: 8Mpa, 25Min; second section: 15Mpa, 45Min; third section: 18Mpa, 12Min);

2) The three-stage pressure control time can be set at any time between 0~99Min99S, and it will take effect immediately after the setting is completed;

3) Each pressure setting parameter and time parameter are completed on the touch screen, and must have power-off memory;

4) It can display the working stage of the machine in real time. After each process is completed, it can send out an audible and visual indication signal, and the machine will automatically descend;

5) The heating temperature can be set freely on the temperature controller.

The vulcanizing machine is divided into two parts on the left and right sides and the left and right sides are symmetrical. The diameter of the oil cylinders on the left and right sides is about 600mm (depending on the working pressure), and the piston stroke is about 900mm. The left and right cylinders work in the same way, but the left and right cylinders cannot be pressurized at the same time. In the middle of the two oil cylinders is the oil tank, on which the fast oil pump motor, pressure boost oil pump motor, oil circuit integrated body and control box are installed.

Both the oil cylinder and the oil tank are under the foundation, and the depth of the foundation is about 1.2m. The pressure bearing plate and the control box are about 500mm above the level ground.

The working body of the machine is divided into right side and left side. It is mainly composed of a hydraulic cylinder and a pressure plate. The hydraulic cylinder mainly provides pressing pressure (the pressure requirement is relatively stable), and the pressure bearing plate is used to hold the product to be pressed. and one for exhaust. In addition to adding cooling water to the circulation pipe, the pressure plate of the circulation pipe must also be cooled in the circulation pipe. Among them, the top of the machine table of the left working body is a high-pressure steam inlet valve and a cooling water inlet valve.

The control box is mainly composed of fuses, PLC and A/D conversion modules, control relays, AC contactors, thermal overload relays, transistor driver boards, and switching power supplies.

At the edge of the foundation on the left are exhaust valves, drain valves, and steam traps.

The control box can realize two working modes of manual adjustment and automatic control of the left and right cylinders, which can be selected through the selection switch on the operation panel.

The oil tank is the place where the hydraulic oil of the whole machine is stored and circulated. For the sake of heat dissipation, the volume should be larger. The selected volume of this technical solution is greater than 1m3.

After the design, installation, program writing and debugging of the control system with PLC as the core are completed, the functions of the machine can also be realized, but the pressure control of the oil cylinder of the machine is not accurate. It is quite difficult to achieve precise pressure control. It is easy to achieve precise pressure control by using a proportional valve. During the commissioning process, this solution has been improved as follows:

Improvement on Supplementary Pressure Motor

The requirement for the pressure supplement motor is that the pressure can be supplemented in time when the pressure supplement action is required. If the set pressure is set to n, the actual pressure of the master cylinder is m. When the pressure appears m>(n+0.3) after pressure replenishment, that is, the actual pressure is greater than the upper limit of the set pressure, and the pressure should be relieved at this time. When m<(n-0.3) appears after the pressure relief valve operates, the actual pressure is lower than the lower limit of the set pressure, and the pressure should be supplemented at this time. Repeatedly like this, the contactor moves frequently, and the motor starts frequently.

In the process of debugging, it is found that the speed of the pressure supplement motor is a key factor affecting the accuracy of pressure control. If the speed of the pressure supplement motor is slow, the displacement of the oil pump will be low, the pressure supplement will be slow, and the PLC detection time will be long, resulting in high precision. Otherwise, the accuracy is low. At the beginning, the supplementary pressure oil pump adopts a 7.5KW 4-pole motor, and the motor speed is high and the oil pump flow rate is large. It is difficult to control the flow rate during pressure supplementation. After switching to a 6-pole motor, the flow rate becomes lower as the speed decreases, the pressure supplementation speed becomes slower, and the pressure control accuracy is significantly improved.

Improvements to the hydraulic system

The phenomenon that the pressure relief speed is too fast during the debugging process is caused by the large flow rate of the pressure relief valve. The cost of using proportional flow valve control will become higher, so it is not considered to be used. At this time, we have adopted the following methods to control the pressure relief speed.

1) A throttle valve is installed in the pressure relief circuit; the pressure relief speed can be manually adjusted by installing a throttle valve, which has greater flexibility, and the pressure relief speed can be adjusted according to the actual situation.

2) Install a damping plate; that is, make a backing plate and install it under the pressure relief valve, and drill another through hole on the backing plate that is smaller than the through hole on the valve body to use as throttling. This method is low in cost. But the pressure relief speed is not adjustable, and the flexibility is not high.

3) The hydraulic control part is designed into two parts, the return pressure relief and the working pressure relief, and the two parts work independently. That is, if the pressure relief during work is slow pressure relief, the pressure can be well controlled. Use quick pressure relief after the work is completed, so that it will not affect the overall work efficiency.

The above first and second methods can play a good control effect on the speed of pressure relief, but also directly affect the time of pressure relief after the work is completed, which still has an impact on the overall work efficiency. In this case, the third method can be considered.

Improvement of pressure supplement control method

In order to maintain a relatively stable pressure, the system requires a fast filling speed, so the motor will inevitably start frequently, and the motor starts with load. This is easy to cause damage to the motor, and also affects the power grid so that the grid voltage often fluctuates.

Since the motor takes a certain amount of time from startup to stable operation. It can be considered that when writing the program, it is written that the supplementary pressure solenoid valve starts to act after the motor starts and runs stably, that is, the delayed action of the solenoid valve does not act synchronously with the control contactor. This can not only reduce the load when the motor starts, but also reduce the capacity of the selected contactor. Of course, this situation depends on the design of the hydraulic system. When the hydraulic system is designed to start with load, the capacity of the contactor should be selected to be larger, that is, at least 5 times the rated current.

Selection of Protective Devices for Supplemented Pressure Motors

In general, a thermal overload relay is selected to protect the motor, but it is not suitable for such occasions. Because the motor starts frequently, we cannot ignore the contactor contact welding problem. In case of contact welding, the PLC still controls the contactor to disconnect after the pressure supplement is completed, but at this time, due to the lack of phase of the motor, although the thermal overload can send an overload signal, it will not help. Therefore, the motor protection part should use motor thermal magnetic circuit breakers and auxiliary contacts instead of thermal overload relays as motor protection devices.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A PLC control system for plastic floor vulcanizing machines, characterized in that it includes fuses, PLC, touch screen, pressure sensor, A/D conversion module, control relay, AC contactor, thermal overload relay, temperature controller , transistor driver board and switching power supply, The fuse is used for short circuit protection of the control system; The touch screen is connected to the PLC through RS485 communication to realize parameter setting, data monitoring and I/O monitoring of PLC; The PLC is the control center of the entire control system; The pressure sensor realizes the detection of the pressure signal; The A/D conversion module is connected to the PLC through an integrated cable, the input point of the A/D conversion module is connected to the sensor, and is used to convert the analog signal fed back by the pressure sensor into a digital signal and then transmit it to the PLC; In the control relay, the coil of the control relay is directly connected to the PLC output point and is directly driven by the PLC; the normally open contact of the control relay is connected with the normally closed contact of the thermal overload relay; The AC contactor is used to control the operation of the motor; the incoming line end of the main contact is directly connected to the air switch, the outgoing line end is connected to the thermal overload relay, and the coil is connected to the normally closed contact of the thermal overload relay; The thermal overload relay is used for overload protection of the motor of the vulcanizing machine. The incoming line end is connected to the outgoing line end of the AC contactor, the outgoing line end is connected to the motor, the normally open contact is connected to the PLC input point, and the normally closed contact is connected to the AC contactor. The coil of the device is connected; The temperature controller is used to detect the steam temperature of the vulcanizing machine; the input end is connected to a K-type thermocouple, and the output end reaches the control temperature to output a switch signal, the output end of the temperature controller is connected to the input end of the PLC, and the temperature controller outputs After the switching signal of the PLC is processed by the PLC, the action of the relevant air valve of the vulcanizing machine is controlled by the PLC; In the transistor driver board, the b pole of the transistor driver board is connected with the PLC output terminal, the e pole of the transistor driver board is connected with the positive pole of the switching power supply, and the c pole of the transistor driver board is connected with the control relay; The switching power supply provides a DC power supply; the input end of the switching power supply is connected with a fuse, and the output end of the switching power supply is respectively connected with a touch screen, a PLC, a transistor drive board and a control relay. 2. a control method of the PLC control system according to claim 1, is characterized in that, comprises the following steps: Step 1. Power on and initialize the PLC; Step 2, the above-mentioned PLC judges whether there is an operation request, if not, continues to stand by, if there is an operation request, then detects whether it is an automatic control request, if not an automatic request, then turns to manual operation; Step 3, if the above-mentioned PLC detects that it is automatic control, then start the oil pump to work, pressurize the master cylinder to the set pressure value, and the oil pump is divided into a fast oil pump and a boost oil pump; Step 4. If the main cylinder is pressurized to the set value, the PLC controls the opening and closing of the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve of the plastic floor vulcanizer. The operation of the pressure oil pump, so as to control the pressure of the main cylinder to the set value, and complete the work control of the plastic floor vulcanizing machine; Step 5. The above-mentioned oil cylinder that has completed the work control of the plastic floor vulcanizing machine is decompressed to less than the set pressure value under the control of PLC. 3. the control method of PLC control system according to claim 2, is characterized in that, the set pressure value in above-mentioned step 3 and step 5 is 1Mpa. 4. the control method of PLC control system according to claim 3 is characterized in that, the opening and closing of exhaust valve, drain valve, water trap, steam inlet valve and cooling water inlet valve in the above-mentioned step 4 comprises the following steps: Step 401, controlling the opening of the drain valve and steam trap through the PLC, and setting the opening time, and timing while opening the drain valve and steam trap; Step 402, if the timing is up in the above step 401, then close the drain valve, continue to open the steam trap, open the steam inlet valve, set the time at the same time, and count at the same time; Step 403, as the timing time of the above-mentioned step 402 is up, then open the exhaust valve, close the steam trap, close the steam inlet valve and open the cooling water inlet valve, and set the time and time at the same time; Step 404, if the timing time of the above step 403 is up, then close the exhaust valve, open the drain valve, close the steam inlet valve and open the cooling water inlet valve, set the time, and count at the same time; Step 405, when the timing of the above-mentioned step 404 expires, close the exhaust valve, drain valve, steam trap, steam inlet valve and cooling water inlet valve. 5. The control method of the PLC control system according to claim 3, characterized in that, in the above step 4, the PLC controls the operation of the fast oil pump and the boost oil pump, thereby controlling the pressurization of the master cylinder to a set value, and completing the vulcanization of the plastic floor Machine work control includes the following steps: Step 501, control the fast oil pump to stop, and the boost oil pump to operate, thereby pressurizing to the first set pressure value, and when the first set pressure value is reached, control the boost oil pump to turn off, and calculate the working time of the first pressure value Timing, judging the working time and working pressure under the first pressure value; Step 502, the working time and working pressure at the first pressure value in the above step 501 meet the requirements, then start the booster oil pump to pressurize to the second set pressure value, and when the second set pressure value is reached, the Control the boost oil pump to close, and time the working time of the second pressure value, and judge the working time and working pressure under the second pressure value; repeat the control of the boost oil pump until it is pressurized to the fourth set pressure value, and the master cylinder is completed. Pressurize.