Copper Dryer Filter
copper filter driers are designed to absorb moisture, acid, and to filter out impurities. Normally be installed as component and replaced as repair part for both domestic and commercial refrigerators, freezers.
This fliter is for air conditioner water tank or fridge, replacing your broken or old one. Copper Dryer Filter,Refrigeration Dryer Filter,Refrigerator Water Dryer Filter,Refrigerator Copper Filter Drier FOSHAN SHUNDE JUNSHENG ELECTRICAL APPLIANCES CO.,LTD. , https://www.junshengcondenser.com
The goal of the development of 1 / 6 axis flexible fastening system
This project is used to transform the special equipment for bolting of diesel chassis (cable capping machine) of CSR Luoyang Locomotive Co., Ltd. (hereinafter referred to as Luoyang Company). Due to the serious aging of the equipment control system, frequent failures, and incomplete maintenance information, the factory is required to come to the factory for maintenance. The maintenance cost is high and the cycle is long, which affects the normal operation of the factory locomotive overhaul. To this end, we have used the microcomputer control technology to transform the equipment, mainly to develop a higher level of control system.
At present, there are three kinds of screwing methods commonly used in China: axial stretching method, torque method and corner method. The more commonly used torque method has the advantage of convenient operation and detection. The disadvantage is that even the same amount of torque, as long as the material of the bolt, the friction of the contact surface, the lubrication of the thread surface and the burr of the thread surface, etc., The axial tension acting on the bolted pair may be different. In order to overcome this shortcoming, multi-step tightening and corner monitoring are adopted on high-grade tightening equipment: by repeated tightening and loosening several times, the machining residual stress of the bolt can be partially eliminated, and the burr and contact surface friction are partially eliminated. The effect of force on the final torque. Through the corner monitoring, it is possible to detect the "missing" of the bolt, the "flower buckle" and the burr that excessively affects the torque.
According to the tightening process, the following fastening steps are designed: (1) Two-axis: pre-tightening (400 Nm) → first step (1000 Nm) → second step (2000 Nm)
→ Step 3 (3000Nm), with multiple functions such as synchronous monitoring, speed detection, corner monitoring, parameter modification, etc.
(2) Six-axis: Can achieve fastening of DF4A, DF4B, DF4C and DF4D four models, step 1 (450Nm) → step 2 (900Nm) → step 3 (1300Nm/1600Nm) 3. <3:1300Nm/ 1600Nm means 1300Nm set torque for DF4A, DF4B, DF4C models, 1600Nm set torque for DF4D models. > According to the process requirements, this fastening machine is mainly used for the disassembly and assembly of diesel engine cylinder head bolts and main bearing bolts in the diesel engine workshop of Luoyang Company. The two-axis fastening machine is used for main bearing bolt removal and assembly, and the six-axis fastening machine is used for diesel cylinder head bolt removal and assembly. It has been demonstrated that using a control system to realize the control functions of the two-axis and six-axis fastening machines is a more reasonable solution, which not only saves cost, but also saves space and installation and debugging time. Since the mechanical fastening components are all purchased, only the design of the electronic control system will be introduced here. The electronic control system is mainly composed of TP270 touch screen, S7-200PLC and MI2 CROMASTER440 (hereinafter referred to as MM440) inverter.
Although the TP270 is a lower cost touch screen, it still provides powerful features. The TP270 touchscreen must use the SIMATICProToolCS configuration software to create graphics, text, custom functions and operating and display elements that need to be displayed on the operating unit on the configuration computer (PC or PU). In order to download the configuration to the operating unit, you can use the operating unit (ie the "IF1A" interface in Figure 1), via the serial MPI/PROFIBUS-DP network, USB or Ethernet interface, or via the standard modem path to the configuration computer Connected. After the configuration has been successfully downloaded, the operating unit is connected to the PLC so that it can communicate with the PLC and respond to the configured information according to the program running in the PLC.
The SIMATICS7-200 series PLC is suitable for the automation of detection, monitoring and control in various occasions. The system adopts CPU224 and two expansion modules, and the communication mode is connected with the touch screen by PPI mode.
The MM440 frequency converter is controlled by a microprocessor and uses an insulated gate bipolar transistor IGBT as a power output device. It has high reliability and functional diversity. Its pulse width modulation switching frequency is optional, which reduces motor operation. The noise, the MM440 drive has comprehensive and comprehensive control and protection functions, which can be used for stand-alone drives or integrated into automation systems.
2 control system design
2.1 design
According to the requirements of on-site operation, the main points of the design scheme of the system are as follows: (1) The protection level of the electric control cabinet should reach IP54, and it should have cooling or ventilation; the AC power line should be separated from the 24V cable; There are interlocks.
(2) The grounding method must comply with the national standard GB/T5526.1-1996; PE grounding can only be concentrated at one point of grounding, the cross-sectional area of ​​the grounding wire must not be less than 6mm 2, the grounding wire is strictly prohibited from surrounding; when the grounding condition is not good, the control transformer Must be designed for floating; the control power supply in the electric control cabinet must use a separate isolation transformer; PLC, touch screen, the grounding end of the inverter must be equipotential bonding.
(3) The maximum frequency of the input signal should be considered when designing the PLC, that is, the ON time or OFF time of the PLC input signal must be longer than the scan period of the PLC; the sum of the output currents of the adjacent two contacts of the PLC does not exceed 1A; PLC switch All input signals must be level signals, and the analog input is no more than 10VDC. 2.2 System Functions
The system adopts touch screen to realize monitoring, parameter modification, operation and other functions; PLC is used to realize program control; inverter is used to realize two or six-axis control, and two-axis and six-axis are interlocked by contactors. The fastening process is completed in three steps: initial twisting → medium twisting → final twisting. The torque value of each step can be set on the touch screen, and the asynchronous process monitoring is realized during the tightening process. At the same time, the fastening machine can display the tightening torque, speed, corner and other parameters in real time, and has a "qualified" display function to prompt the operator to complete the operation. In addition, there should be a variety of alarm functions, such as out of sync, zero drift, sensor disconnection, etc., for the protection of equipment and bolts under abnormal conditions.
2.3 touch screen picture design
According to the process requirements, the main screen of this project is the selection screen, that is, the switching screen of two axes and six axes. If you select the two-axis screen, enter the two-axis control screen, set the parameters (if you are first booting, you need to test the motor and sensor parameters first), and pass the parameters to the PLC to control the corresponding actions. The six axes are the same as the two axes.
After the screen design is completed, the corresponding parameters for communication with the PLC must also be set to control the action of the PLC. At the same time, it is necessary to set the communication baud rate and baud rate setting, and consider the calculation speed of the PLC.
2.4PLC control program design
This system adopts the way that the main program calls the subroutine, and the program block is divided into one main program and 14 subprograms. The main program implements initialization, program selection, two-axis program call, six-axis program call and other functions. The subroutine mainly solves the data acquisition and processing, the implementation of the fastening step, the alarm signal processing, the second/six-axis selection, the control of the frequency converter, and the determination of the rotation angle. Each subroutine performs separate functions, and subroutines can also nest subroutines. The two-axis control subroutine is actually the main program that realizes all the functions of the two-axis fastening device. It needs to call 5 sub-programs, which are test subroutine, I/O subroutine, axis control subroutine, counting subroutine and A/. D processing subroutine.
(1) The test subroutine realizes the idle performance test of two torsion axes, tests the performance of the sensor, and the motor speed.
When the sensor is disconnected or the idling test value is out of tolerance, an alarm signal is transmitted to the touch screen, and the subroutine interrupts the tightening step to be performed. All tests pass before they can enter the next screen.
(2) The I/O subroutine realizes the positive and negative rotation and stop of the axis, and processes the digital input, output signal and alarm information.
(3) The axis control subroutine realizes the 4-step tightening of the shaft. When the torque value of the two axes reaches each step, the next tightening is performed. If the torque value of one shaft reaches the set value during the tightening process, and the other shaft still does not reach within the set time, stop. Tighten and simultaneously send out-of-sync information to the touch screen, and the tightening procedure can be re-executed after the fault is processed. When the tightening step is completed, a tightening completion signal is issued.
(4) The counting subroutine is used to monitor the motor speed and bolt angle. When the speed is abnormal during the test, the alarm bit is activated. In the last step of tightening the bolt, the corner monitoring function is activated. When the final rotation angle of the two bolts meets the set value, the fastening completion signal can be activated, otherwise an alarm message will be issued.
(5) The A/D processing subroutine is to digitally process the voltage signal collected by the analog input module for torque control. In order to prevent interference, the averaging method is used for processing, and the number of sampling is 128 times. Since the motor is reversed and reversed, the opposite torque value will be generated. To display the correct torque value, the collected data will be processed as follows: 0 when input is 2.5V, -4000Nm when 0V, and 4000Nm when 5V. 2.5 Inverter Precautions for use
When selecting the inverter, determine whether the control type is constant voltage control or constant current control and load type. Pay special attention to the performance curve of the load. For anti-interference, it is better to use shielded twisted pair cable for the analog signal line related to the inverter. The cable is shielded with a three-core cable. The grounding resistance of the grounding terminal of the inverter is required to be as small as possible. The cross-section of the grounding conductor is not less than 4 mm 2 and the length is not more than 5 m. It should be separated from the grounding point of the power equipment and cannot be grounded. One end of the shield of the signal line is connected to the ground of the inverter, and the other end is floating.
3 Conclusion Using a control system to achieve control of the two-axis and six-axis fastening system, saving cost and space. The two-axis fastening machine can realize single-axis single action for easy operation and positioning. The six-axis disassembly torque is large enough to meet the requirements of the DF4D model. The system is modular in design and can be fitted with different components depending on the application. Due to the detailed equipment alarm information, the operation is more convenient and the troubleshooting is simpler.
Used in two-way circulation refrigeration system tubes
Absorb moisture and acidic harmful substances in the refrigeration system and filter impurities.
This filter dryer is fit for refrigerators (but refrigerator is not including here)
Talking about the Development and Application of Flexible Fastening System
With the continuous advancement of science and technology, based on electronic information technology, it integrates traditional mechanical manufacturing, computer, group technology and modern control, sensor measurement and control, information processing, network communication, hydraulic pneumatic and optical electromechanical technology. The technology has been rapidly developed and widely used, which makes ordinary mechanical equipment gradually replaced by high-efficiency, high-precision numerical control equipment, which has produced tremendous productivity and brought great changes to the manufacturing industry. Microcomputer control technology has become the basis of modern manufacturing technology. It can effectively solve complex and precise motion program problems, adapt to the needs of various mechanical products to quickly update and replace, and has significant economic benefits.