1. Product introduction
In order to adapt to the development of various fields as soon as possible, Dali's skilled workers, technicians, and engineers who master the basic knowledge and practical operation skills of hydraulic transmission are tr*ned and sent to all fronts of socialist construction. According to the content requirements of "Hydraulic Transmission", "Hydraulic Principle", " Mechanical Fundamentals" and other textbooks and the characteristics of domestic hydraulic components, our company refers to foreign advanced technology. After years of hard exploration, we use theory as a basis and experiment as a means. Using high-precision processing technology, we overcame a series of practical difficulties such as transparent organic plastics that are thermoplastic, easy to deform, and have poor mechanical strength, while hydraulic components require high surface finish and structural accuracy. Finally, we successfully developed a transparent hydraulic transmission demonstration system.
Various machinery has diverse requirements for hydraulic transmission, which are generally composed of basic functional circuits such as direction control loops, pressure control loops, speed control loops, and sequence control loops. The test screen of this test bench is made of 1.0mm cold-rolled steel plate, and each hydraulic component uses a transition base plate. The overall appearance is beautiful and elegant, the structure is sturdy and durable, and it is easy to operate. This demonstration system enables students to become familiar with the structure, performance and use of more than 20 commonly used hydraulic components through experimental demonstrations of 18 basic control loops for the above four basic functions (expanded experiments can reach 60 types), and to master more than 10 types of commonly used hydraulic components. The working process and principle of this basic circuit can improve students' ability to handle faults and solve problems. They can be inspired by the experimental demonstration and arouse interest. They can use it to conduct experiments on other oil circuits within the tolerances of various components provided by this product ( As shown in the picture design, graduation project).
This product refers to the characteristics of domestic hydraulic components and is more suitable for domestic teaching requirements. The system uses transparent hydraulic components, a combined slot structure, movable oil joints, and general electrical lines. By using the attached tools and materials and referring to the experimental instructions, it can easily control, experiment and test various commonly used hydraulic transmissions. Students understand the internal principles, structures and working processes of oil circuits and hydraulic components. It is an ideal equipment for teaching hydraulic transmission.
2. M*n technical parameters
1. Power supply: AC220V 50Hz
2. DC power supply: input AC220V and output DC24V/2A
3. Programmable controller ( plc ): Mitsubishi FX1S-20MR host; 12 inputs and 8 outputs (relay output mode)
4. Hydraulic tr*ning oil pump motor power : 250W Equipped with a dedicated motor speed regulator; speed range: 0-1700r/min; overall dimensions: 530mm×350mm×450mm
5. During tr*ning, the noise at a distance of 1.5m from the hydraulic tr*ning platform is ≤58dB.
6. The oil flow pressure requirement for practical tr*ning is 0.3-0.8Mpa (maximum pressure of oil pump: Pmax=2.5Mpa)
7. Electromagnetic reversing valve: DC24V, suction 3Mpa
8. Overall dimensions of practical tr*ning device: 1500mm×650mm×1700mm
3. M*n features
1. The hydraulic PLC control tr*ning device m*nly consists of a tr*ning table, a tr*ning platform , hydraulic components, electrical control devices, programmable controller (PLC) and other components.
2. The tr*ning table and platform are made of iron with a double-layer matt dense pattern spray-p*nted structure. The tr*ning table cabinet stores hydraulic components, etc.
3. Equipped with all commonly used hydraulic components: Each hydraulic component is equipped with a mounting base plate, which can conveniently and arbitrarily place the hydraulic components on the aluminum alloy profile panel (the panel has an aluminum alloy profile structure in the form of a "T" groove). The oil circuit overlap adopts quick-change joints, which are easy to disassemble and connect without oil leakage.
4. The tr*ning components are all made of transparent organic materials, making it easy to understand the structure, performance and use of dozens of commonly used hydraulic components. Master the working principles of dozens of basic circuits, and practice assembly of circuits quickly and conveniently.
5. Through the integration of mechanical control, traditional relay control, advanced PLC automatic control, PLC programming and MGGS configuration monitoring technology, its functions can be flexibly realized.
6. The tr*ning control unit can also use an independent relay control unit for electrical control. Through comparison, the superiority and advancement of PLC programmable control will be highlighted, and the understanding and mastery of PLC programmer will be deepened.
7. Hydraulic and pneumatic transmission design and control virtual simulation software
This software is developed based on unity3d. The software adopts the form of three-dimensional roaming. Movement can be controlled by the keyboard and the lens direction can be controlled by the mouse. The interface has home page, help, full screen, component recognition, circuit construction, key component testing, and typical system testing interfaces.
1. Component identification adopts the form of automatic playback, which introduces the m*lbox, liquid level gauge, oil pump unit on the equipment (the pop-up hydraulic symbols, principles and introduction are introduced here, click OK to enter the next introduction), valve frame, and pressure gauge. , sensors , etc.
2. The disassembly and assembly of components is divided into learning mode and assessment mode. There are built-in electromagnetic reversing valves, plate relief valves, plunger pumps, filter valves, and electro-hydraulic servo valves. In the learning mode, the disassembly sequence is prompted and highlighted. There are no prompts for disassembly and installation in assessment mode. If the disassembly and assembly sequence is wrong, the next step of disassembly and assembly will no longer be possible. The toolbar is equipped with draggable seals, pumps, valves, oil filters, hex wrenches, pipe wrenches, adjustable wrenches, dead wrenches, and M5 screws.
3. The hydraulic components are equipped with one-way valve (hydraulic control, poppet valve core, ball valve core), m*n structure of the reversing valve (O type, Y type, H type), hydraulic cylinder (assembled plunger, double-acting single outlet rod) , double-action double-output rod, single-action double-output rod, single-action single-output rod), etc. Each construction experiment adopts a graphical method and is constructed by dragging the set graphics. In the graphics library There are confusing graphics.
4. Hydraulic selection is based on the hydraulic schematic diagram, and then selects the nominal displacement of the pump (12 items, including 11 confusing items) and pressure level (5 items, including 4 confusing items), and the selection of the solenoid relief valve (3 specifications, 3 pressure levels, and 3 flow levels, all of which have confusing items), oil filter selection (multiple choices include confusing items), servo valve selection (multiple choices include confusing items), and the wrong selection system will Automatically prompt the correct answer. After selecting, drag the corresponding tool to the highlighted area according to the prompt.
5. Circuit inspection is done by selecting the correct accessories, including the selection of sealing rings, checking valve switches, etc. Then proceed to the next step to turn on the machine. Follow the prompts to turn on the machine. After turning on the machine, enter the monitoring interface. Turn on the equipment one by one according to the prompts. The prompts are in the form of text and button highlighting.
6. Hydraulic cylinder pressure test Enter the experiment through the test button on the background interface and gradually analyze To start friction test, start friction force, parameter setting, start test, draw curve, stop test.
7. Typical system tests are divided into trial operation, stage response test and frequency response test. The above tests are all conducted through the background monitoring interface.
8. The software must be able to rotate, zoom in and out in all directions to view its det*ls. And the same platform as a whole cannot be displayed as separate resources.
8. Microcontroller , PLC programmable design and control virtual simulation software.
This software is developed based on unity3d. It has built-in task books and experimental prompts. It adopts the form of three-dimensional roaming. Movement can be controlled by the keyboard, the direction of the lens can be controlled by the mouse, and the distance of the picture can be controlled by the mouse wheel. Rotated 360 degrees, the three-dimensional wall has electrical diagrams p*nted on it.
1. Equipment component assembly: Follow the highlighted prompts to find the component control rack. You can drag components from the component library according to the electrical component layout diagram and place them on the component control rack. The component library is equipped with control panels, switching power supplies, micro relays, and PLCs. , frequency converter, stepper motor, AC motor, servo motor, servo driver, stepper driver, interface board, operation panel, circuit breaker, servo motor interface, digital display voltmeter, there will be a prompt when the selection is wrong.
2. Technical indicator measurement: Select the multimeter to check the servo motor connection cable and the servo driver with BOP panel. Adjust the left and right buttons to the ohm level, drag the black and red test leads and insert them into the R, S, T, U, V, W and ground phases respectively for testing. For resistance value, according to the highlighted prompt, find the power switch in the scene, drag the pen or multimeter to measure whether the power is on.
3) Electrical component connection: According to the electrical wiring diagram, connect the power line and control line, highlight the interface, connect the driver, interface board, power line, servo motor, encoder, PLC, and relay in order, and turn on the m*n power supply After turning on the switch, servo power switch, and faulty circuit switch, a fault code will be prompted, and you can select the cause of the fault from three items.
4) Parameter adjustment test: Turn on the power to adjust the speed, set the driver parameters according to the requirements of the mission statement, perform inching control/analog speed adjustment/multi-stage speed control, and observe the three-dimensional servo motor motion control. Select any of the 6 PLC programs and then adjust the servo drive analog speed. The PLC parameters are adjustable. Set the drive parameters and enter the three-dimensional servo motor motion control interface and electrical display interface. The operation panel is equipped with servo start, low speed, medium Speed, high speed, servo stop, torque limit, abnormal reset, forward/reverse rotation selection, 0-10 sliding control (the electrical panel displays the value in real time).
5) Inspect the three-dimensional virtual simulation machine of the servo system mask machine, observe its structure, inject fault points, select multiple fault causes, and locate faults. Connect the fault causes with the corresponding detection and positioning methods, and troubleshoot after selecting the correct ones. Connect the cause of the f*lure with the corresponding solution.
6) Control process plan, optional single machine mode and online mode of inching control/analog speed regulation/multi-stage speed regulation control, call up the control panel, display the operation of 3 production lines, perform real-time control, optional inching, low and medium High speed, start and stop control, adjustable speed. According to the control plan, the system automatically determines the performance of the production line and submits a disclosure record.
4. Transparent hydraulic PLC control basic tr*ning circuit
1. Use the reversing circuit of the manual reversing valve.
2. Use the locking circuit of the reversing valve with neutral position function.
3. Use the locking circuit of the hydraulically controlled horizontal valve.
4. Pressure setting circuit.
5. Secondary pressure control circuit.
6. Use the pressure reducing circuit of the pressure reducing valve.
7. Use the booster circuit of the booster cylinder.
8. Use the unloading circuit of the H-type reversing valve.
9. Oil inlet throttle speed regulating circuit.
10. Oil return throttle and speed regulating circuit.
11. The reversing speed regulating circuit of the speed regulating gear pump.
12. A composite speed regulating circuit composed of a speed regulating gear pump and a speed regulating valve.
13. Speed switching circuit with short circuit of flow valve.
14. Use the secondary feed path connected in series with the speed control valve.
15. Use the same secondary feed path with speed control valve in parallel.
16. Use the sequence action circuit of the sequence valve.
17. Use a pressure relay sequence action circuit.
18. Sequential action loop controlled by travel switch.
19. Use the sequential action circuit of the stroke reversing valve.
20. Synchronous circuit of series hydraulic cylinders.
21. A reversing circuit controlled by a pilot relief valve.
5. List of transparent hydraulic PLC control tr*ning devices
|
serial number |
Classification |
Component name |
quantity |
|
1 |
Tr*ning platform |
Tr*ning platform |
1 |
|
2 |
Tr*ning table |
Tr*ning table |
1 |
|
3 |
pumping station
|
Drag motor |
1 |
|
Dedicated power supply and speed control circuit |
1 |
|
High-precision digital tachometer |
1 |
|
gear pumps |
1 |
|
tank |
1 |
|
4 |
Combining transparent components |
Double-acting cylinder (with stroke impact block) |
2 |
|
Spring return cylinder |
1 |
|
Pressurized cylinder |
1 |
|
Auxiliary fuel tank |
1 |
|
One-way valve |
2 |
|
Hydraulic control check valve |
2 |
|
Relief valve (direct acting) |
2 |
|
Throttle valve (direct acting) |
1 |
|
Control Valve |
2 |
|
sequence valve |
2 |
|
Pressure reducing valve |
1 |
|
Two-position two-way solenoid directional valve |
1 |
|
Two-position four-way solenoid directional valve |
2 |
|
"O" type three-position four-way solenoid directional valve |
1 |
|
"H" type three-position four-way solenoid directional valve |
1 |
|
"M" type three-position four-way solenoid directional valve |
1 |
|
Two-position four-way stroke directional valve |
1 |
|
Three-position five-way manual directional valve |
1 |
|
pressure relay |
1 |
|
pressure gauge |
3 |
|
Micro travel switch (normally open, normally closed) |
2 |
|
tee |
7 |
|
four links |
3 |
|
5 |
appendix |
towel |
2 pieces |
|
oil pan |
1 |
|
Transparent hydraulic hose φ8 |
20 meters |
|
Special hydraulic oil |
10 pounds |
|
6 |
Electrical accessories |
Solenoid valve universal connection line |
3 items |
|
Pressure relay plug wire |
1 item |
|
Programming cable (Mitsubishi) |
1 item |
|
Screwdriver 3×80 (slotted, cross) |
1 each |
|
Scissors |
1 handful |
|
movable wrench |
1 handful |
|
Needle nose pliers |
1 handful |
|
Hexagonal wrench M5 |
1 handful |
|
Hexagonal wrench M6 |
1 handful |
|
Internal circlip pliers |
1 handful |
|
External circlip pliers |
1 handful |
|
Quick oil connector |
5 |
|
Various sealing rings |
1 bag |
|
9 |
material |
Practical Tr*ning Instructions |
1 volume |
|
CD (Mitsubishi PLC programming software and control program) |
1 disc |
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