A tension testing machine control system

Abstract

The utility model discloses a control system belongs to tension testing machine technical field, concretely relates to a tension testing machine control system, include: electric control unit, hydraulic unit and operation control panel, electric control unit with hydraulic unit is connected, operation control panel with electric control unit with hydraulic unit is connected to control its work, electric control unit is by oil tank, plunger pump, energy accumulator, proportional overflow valve, reversing valve, proportional pressure reducing valve, reverse valve and hydraulic cylinder are composed, hydraulic unit is by PLC, proportional amplifier, digital module, analog module, tension sensor, transmitter is composed, the utility model measures and records the control amount corresponding to each grade tension, and the control amount is stored in PLC after correction, when testing, PLC controls each point tension even increase, according to the control amount measured before, can reach the subsection point fast, again according to feedback control its slow output, makes it reach higher accuracy.

Description

Technical Field

[0001] This utility model discloses a control system, belonging to the technical field of tensile testing machine, specifically relating to a tensile testing machine control system. Background Technology

[0002] A tensile testing machine is an important piece of equipment used for testing the mechanical properties of materials, and it is widely used in many industries such as metals, plastics, rubber, textiles, and construction. Its main function is to measure the performance parameters of materials under external forces such as tension, compression, and bending.

[0003] Tensile testing machines are operated by hydraulic systems. Pressure control in hydraulic systems often employs PID control. However, when multiple PID controllers are required in the system, with some in parallel and others in series, parameter tuning becomes cumbersome, and it's difficult to ensure synchronization of the controller outputs. Furthermore, it's challenging to quickly reach a steady state without oscillation during adjustment. Utility Model Content

[0004] Purpose of the utility model: To provide a control system for a tensile testing machine to solve the problems mentioned above.

[0005] Technical solution: A control system for a tensile testing machine, comprising: an electrical control unit, a hydraulic unit, and an operation control panel;

[0006] The electronic control unit is connected to the hydraulic unit, and the operation control panel is connected to both the electronic control unit and the hydraulic unit to control their operation;

[0007] The electronic control unit consists of an oil tank, a piston pump, an accumulator, a proportional relief valve, a reversing valve, a proportional pressure reducing valve, a reverse valve, and a hydraulic cylinder.

[0008] The hydraulic unit consists of a PLC, a proportional amplifier, a digital module, an analog module, a force sensor, and a transmitter.

[0009] In a further embodiment, the oil tank is connected to the input end of the plunger pump, the output end of the plunger pump is simultaneously connected to the inlet of the accumulator, the proportional relief valve, and the directional valve, the A outlet and B outlet of the directional valve are connected to the input end of the reverse valve, the output end of the reverse valve is connected to the hydraulic cylinder and the input end of the proportional pressure reducing valve, the output end of the proportional pressure reducing valve is connected to the hydraulic cylinder, and the return port of the directional valve and the output valve of the relief valve are connected to the oil tank.

[0010] In a further embodiment, the directional valve, the reverse valve, and the proportional pressure reducing valve form a tension assembly and are connected to the hydraulic cylinder.

[0011] In a further embodiment, the transmitter is installed between the output of the proportional pressure reducing valve and the hydraulic cylinder.

[0012] In a further embodiment, a filter is provided between the oil tank and the plunger pump.

[0013] In a further embodiment, the PLC has 24 digital inputs and 16 digital outputs. The digital module and the analog module are connected to the PLC. The analog module has 4 analog input points and 4 analog output points. There are two proportional amplifiers, which are respectively connected to the proportional pressure reducing valve and the proportional relief valve. The analog module is connected to the proportional amplifier, the proportional pressure reducing valve, and the proportional relief valve using shielded cables. The tension sensor is connected to the pull rod.

[0014] Beneficial effects: This utility model measures and records the control quantities corresponding to each level of tensile force. After the control quantities are corrected, they are stored in the PLC. During the test, the PLC controls the tensile force at each point to increase evenly. Based on the previously measured control quantities, the segment point can be reached quickly. Then, based on the feedback, the output is controlled to be slow, so that it achieves a high degree of accuracy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the hydraulic unit of this utility model.

[0016] Figure 2 This is a schematic diagram of the electronic control unit of this utility model.

[0017] Attached reference numerals: 1. Oil tank; 2. Filter; 3. Piston pump; 4. Accumulator; 5. Proportional relief valve; 6. Directional valve; 7. Reverse valve; 8. Proportional pressure reducing valve; 9. Transmitter; 10. Hydraulic cylinder. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] A tensile testing machine control system includes: an electrical control unit, a hydraulic unit, and an operation control panel;

[0022] In one embodiment, the electronic control unit is connected to the hydraulic unit, and the operation control panel is connected to both the electronic control unit and the hydraulic unit to control their operation;

[0023] The electronic control unit consists of an oil tank, a piston pump, an accumulator, a proportional relief valve, a reversing valve, a proportional pressure reducing valve, a reverse valve, and a hydraulic cylinder.

[0024] The hydraulic unit consists of a PLC, a proportional amplifier, a digital module, an analog module, a force sensor, and a transmitter.

[0025] In one embodiment, such as Figure 1 As shown, the oil tank is connected to the input end of the plunger pump, and the output end of the plunger pump is simultaneously connected to the inlet of the accumulator, the proportional relief valve, and the directional valve. The A outlet and B outlet of the directional valve are connected to the input end of the reverse valve. The output end of the reverse valve is connected to the hydraulic cylinder and the input end of the proportional pressure reducing valve. The output end of the proportional pressure reducing valve is connected to the hydraulic cylinder. The return port of the directional valve and the output valve of the relief valve are connected to the oil tank.

[0026] In one embodiment, such as Figure 1As shown, the directional valve, the reverse valve, and the proportional pressure reducing valve form a tension assembly and are connected to the hydraulic cylinder.

[0027] In one embodiment, such as Figure 1 As shown, the transmitter is installed between the output end of the proportional pressure reducing valve and the hydraulic cylinder.

[0028] In one embodiment, such as Figure 1 As shown, a filter is provided between the oil tank and the plunger pump.

[0029] In one embodiment, such as Figure 2 As shown, the PLC has 24 digital inputs and 16 digital outputs. The digital module and the analog module are connected to the PLC. The analog module has 4 analog input points and 4 analog output points. There are two proportional amplifiers, which are respectively connected to the proportional pressure reducing valve and the proportional relief valve. The analog module is connected to the proportional amplifier, the proportional pressure reducing valve and the proportional relief valve using shielded cables. The tension sensor is connected to the pull rod.

[0030] In one embodiment, a pre-test is required to ensure test success before the formal test. During this pre-test, the pressure characteristics under the current temperature and oil conditions, as well as the control values ​​corresponding to each pressure level, can be obtained. The control values ​​corresponding to each tension level can be measured and recorded using a test fixture, and the corrected control values ​​are stored in the PLC. During the formal test, the PLC controls the tension at each point to increase uniformly. Based on the previously measured control values, the breakpoint can be quickly reached, and then the output is slowly controlled based on feedback to achieve higher accuracy.

[0031] In one embodiment, such as Figure 1 As shown, the piston pump is used to provide power to the hydraulic system, the accumulator can absorb the impact of sudden pressure changes on the system and improve system stability, the system pressure is regulated by the electromagnetic proportional relief valve, the pressure of each branch is regulated by the electromagnetic proportional pressure reducing valve, the reverse valve is used to help maintain pressure, the proportional pressure reducing valve and the proportional relief valve are pilot operated, and the directional valve is a three-position four-way valve.

[0032] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A control system for a tensile testing machine, characterized in that, include: Electrical control unit, hydraulic unit, and operation control panel; The electronic control unit is connected to the hydraulic unit, and the operation control panel is connected to both the electronic control unit and the hydraulic unit to control their operation; The electronic control unit consists of an oil tank, a piston pump, an accumulator, a proportional relief valve, a reversing valve, a proportional pressure reducing valve, a reverse valve, and a hydraulic cylinder. The hydraulic unit consists of a PLC, a proportional amplifier, a digital module, an analog module, a force sensor, and a transmitter.

2. The control system for a tensile testing machine according to claim 1, characterized in that, The oil tank is connected to the input end of the plunger pump. The output end of the plunger pump is simultaneously connected to the inlet of the accumulator, the proportional relief valve, and the directional valve. The A and B outlets of the directional valve are connected to the input end of the reverse valve. The output end of the reverse valve is connected to the hydraulic cylinder and the input end of the proportional pressure reducing valve. The output end of the proportional pressure reducing valve is connected to the hydraulic cylinder. The return port of the directional valve and the output valve of the relief valve are connected to the oil tank.

3. The tensile testing machine control system according to claim 2, characterized in that, The reversing valve, the reverse valve, and the proportional pressure reducing valve form a tension assembly and are connected to the hydraulic cylinder.

4. The control system for a tensile testing machine according to claim 3, characterized in that, The transmitter is installed between the output end of the proportional pressure reducing valve and the hydraulic cylinder.

5. The control system for a tensile testing machine according to claim 3, characterized in that, A filter is provided between the oil tank and the plunger pump.

6. The control system for a tensile testing machine according to claim 1, characterized in that, The PLC has 24 digital inputs and 16 digital outputs. The digital module and the analog module are connected to the PLC. The analog module has 4 analog input points and 4 analog output points. There are two proportional amplifiers, which are respectively connected to the proportional pressure reducing valve and the proportional relief valve. The analog module is connected to the proportional amplifier, the proportional pressure reducing valve and the proportional relief valve using shielded cables. The tension sensor is connected to the pull rod.

Images