With the continuous development of science and technology, the application of programmable controller in concrete towing pump is becoming more and more widespread. The use of programmable controller replaces the complicated logic wiring of separating elements in the past, effectively guarantees the reliability of the operation of concrete towing pump. Firstly, the MC6H/32 programmable controller is introduced, and then the application of MC6H/32 programmable controller in concrete towing pump is discussed. Generally speaking, the number of input and output points needed to be controlled during the operation of concrete towing pumps is relatively small, so small programmable controllers are often used in the selection of programmable controllers, which can be used to control the switching quantity. But with the continuous improvement of concrete towing pump technology, the requirement for the controller is higher and higher. In addition to the requirement that the controller can control the switching quantity, the controller is also required to control the throttle and pump displacement of diesel engine according to a certain proportion.
It is difficult to meet the requirement by using small programmable controller, and more advanced controller is needed. Programming controller. This paper mainly introduces the application of MC6H/32 programmable controller. The programmable controller only needs one MC control element to control switching quantity and multi-channel proportional control, so as to improve the reliability of concrete towing pump operation. MC6H/32 Programmable Controller (PLC) is a high-performance controller which integrates the functions of proportional amplifier, programmable controller, relay output, analog input A/D module and so on under the harsh environment of high humidity, high temperature and severe vibration. The input part includes six switch inputs, six analog inputs and four pulse counting inputs. The output part mainly includes three switch outputs, six PMW proportional electromagnet outputs, one engine throttle regulating motor STM terminal and one 0-5V analog output terminal. According to the basic requirements of use, the pulse counting digital transmission can be realized. The input end or analog input end can be set as the switch input end, and the output end of proportional electromagnet can also be set as the switch output end. MC controller software can also be compiled according to the use requirements and solidified in MC control. The operation of the system needs to be based on MC software. Firstly, the pressure of hydraulic system of concrete pump can be controlled by constant power. Its power is mainly determined by the displacement of oil pump and the speed of diesel engine. When the actual power is greater than the set power, the controller will automatically reduce the control current, and then reduce the swing angle of oil pump, so as to achieve the purpose of constant power control and ensure that the diesel engine can be in the positive position.
Under normal operating conditions. Secondly, the electro-hydraulic ratio is used to control the oil pump, the potentiometer is used to control the displacement of the oil pump at the output end, and the MC6H controller terminal is used to provide the current to control the displacement of the oil pump for the proportional electromagnet of the oil pump. In order to enable the user to adjust the displacement of the oil pump at any time according to the actual demand, the displacement adjustment is set on the control panel. Potentiometer, through the potentiometer, can realize the control of pumping times and the running speed of concrete cylinder. Thirdly, the automatic switching control functions of pumping low pressure and high pressure are added. When pumping concrete with concrete pumps, the working modes of high-pressure small displacement and low-pressure large displacement can be determined by referring to the preset working pressure of the system. The automatic switching can be realized during the construction of concrete towing pumps, and the working conditions of high-pressure and low-pressure can be displayed on the display screen. Fourthly, the function of emergency operation is added, and the size of emergency current can be set in advance in the program. Fifthly, the bus display screen chooses CAN-BUS display screen, which can display the rotating speed, system working pressure, cumulative pumping time, the number of pumps per minute, cumulative total pumping volume, the theoretical amount of pumping and the specific time of starting work. When automatic pumping is carried out, the whole process of automatic pumping is displayed on the display screen by animation. In addition, the specific working conditions of the main cylinder, stirring steering, distribution valve, throttle size adjustment and reversing proximity switch can be displayed through the display liquid, which can provide great convenience for users when solving the fault. Sixthly, wireless remote control function is added to concrete pump. In practice, users can control the operation of towing pump at a distance of about 50m. Seventh, using PMW-output terminal specially designed for MC controller to generate bi-directional STM motor current which can control diesel engine throttle, greatly facilitates the adjustment of diesel engine concrete pump throttle, and has high practical value. MC6H/32 programmable controller is equipped with CAN-BUS total display screen.
Its main function is to provide some important information in the working process of concrete pump to users and display process parameters. Chinese and English are built in the display screen. Users can choose according to their actual needs. In the operation process, the F4 key is used to select the language, 1 for Chinese, 0 for English. After confirmation, press the confirmation key, and press ESC key to return. In addition, in the language selection screen, user password, time, display contrast, software information, display brightness and other information can also be set.
After pressing the F1 key below the display screen, you can switch four main pages according to your needs. On the main page 3, the speed and power of the diesel engine, the torque of the oil pump and the power of the oil pump can be displayed. The working hours and cumulative working hours can be displayed on the main page 4. After pressing F2, you can enter the input page. There are three switching pages in the output page. The input page 1 will display the information of diesel engine speed, main cylinder stroke, oil pump speed, system pressure, back pump switching status, etc. The page 2 will display the switching proximity switch, the dynamic state of distribution valve point, and the main cylinder switching status. It shows throttle adjustment, high and low pressure state switching and emergency operation of diesel engine. After pressing F3, you can enter the output page.
There are two pages in the output page which can be switched. On the output page 1, the working status of the main cylinder, the main oil pump and the solenoid valve of the distribution valve can be displayed back. On the output page 2, the state of the throttle motor steering and the agitator steering can be displayed back. Firstly, the circuit of the control system is very simple, and only one MC controller is needed to control the switching quantity and multiplex ratio of the concrete pump. The input end of MC controller can process pressure sensor, potentiometer, speed sensor, switch signal and so on, and use the sensor with built-in amplifier and MC controller to supply power. In order to use small programmable controller, it is necessary to add corresponding proportional amplifier or expansion module. Secondly, the output current of MC controller can drive solenoid valve directly, which saves a lot of connection points and significantly reduces the failure rate. When using a small programmable controller, because the output current of the crystal is relatively small, it is impossible to drive the solenoid valve. The solenoid valve can only be driven by isolating the optical coupling amplifier and the intermediate relay, so the circuit structure will be more complex. Thirdly, after using MC6H/32 programmable controller, the real-time working state and various parameters of concrete pump can be reflected, and BODEM monitoring software can be opened by connecting the computer and BB-3 interface, and the changing curve of each parameter can be displayed and recorded, such as swing cylinder pressure and main cylinder pressure switching. Variation curves, these data can help designers to provide reference for pumping performance analysis of concrete pumps, and small programmable controllers want to record the changes of dynamic curves of various parameters is more difficult. Fourthly, the MC controller can automatically identify the work of the output interface and the input interface.
When the external circuit of the analog input is short-circuited or open-circuited, the fault will be displayed on the display screen immediately. By connecting the BB-3 interface of MC controller with the computer, and then opening the BODE monitoring software, the locations of the output and input fault points can be quickly found out, which reduces the maintenance and judgment time of the maintenance personnel, and improves the economic benefits in the use process.
When the traditional programmable controller fails, it can only be prompted by the light-emitting diode. Only professionals can find out the fault when analyzing the fault. Fifth, the use of MC6H/32 programmable controller can make the concrete pump into emergency operation, in the pre-set current range, the oil pump electromagnet current control, when operating irregularly, will also protect the system. Sixthly, the MC processor is equipped with CAN-BUS bus interface, which greatly facilitates the communication with wireless remote controller and CAN-BUS bus interface display screen. By using MC6H/32 display screen and controller in concrete pump, the grade and technical content of the product are improved, the reliability of the product is ensured, and the labor intensity of the staff is reduced. It improves the flexibility of equipment and reduces the maintenance time and judgment time of equipment failure. In summary, the use of MC6H/32 programmable controller in concrete towing pump significantly improves the control efficiency, improves the flexibility of equipment, realizes automatic fault identification, thermostatic element and has very high application value. Although the use of MC6H/32 programmable controller will increase the cost in the actual application process, the increased cost can be compensated in terms of reducing the cost of equipment failure maintenance and saving production costs, so the product has a high application value.