CN103016460B - Photoelectric automatic exhaust valve for hydraulic system - Google Patents

Abstract

The invention discloses a photoelectric automatic exhaust valve for a hydraulic system, which is mainly composed of a prism, a sensor, an electromagnetic valve, a valve body and a control circuit. The invention is placed on a hydraulic oil tank or a hydraulic cylinder, and is connected with a hydraulic system through a small hole equipped with a filter screen, and part of the oil liquid and gas enters the exhaust valve. The prism is mainly used to detect the liquid level in the valve, and the sensor is used to detect the temperature, pressure and other parameters in the valve. When the exhaust condition is satisfied, the circuit controls the solenoid valve, opens the port between the exhaust valve and the outside world, and discharges the gas in the system through the exhaust valve. The invention can automatically discharge the air in the hydraulic system without oil leakage without manual operation; the photoelectric sensor and circuit control can accurately detect the internal parameters of the valve and control the gas displacement.

Description

Photoelectric automatic exhaust valve for hydraulic system

technical field

The invention relates to a photoelectric automatic exhaust valve, in particular to an automatic exhaust valve used in a photoelectric hydraulic system.

Background technique

If there is too much gas inside the hydraulic system, it will cause great harm to the system. Air or other gases will inevitably be mixed in the oil of the hydraulic system. Therefore, it is necessary to find a method to discharge these gases from the hydraulic system. Automatic exhaust valve is the main choice to deal with such problems at present, it avoids mistakes caused by negligence of manual operators; it is also suitable for occasions where manual operation is difficult. Generally, the automatic exhaust valve needs to be controlled by opening and closing pressure, and is only fixed by the internal spring, but the internal spring is difficult to adjust; at the same time, it has the characteristics of being unable to monitor external conditions and having weak remote control capabilities. Therefore, the automatic control ability of the general automatic exhaust valve is not enough.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the prior art and provide a photoelectric automatic exhaust valve for a hydraulic system, which can automatically discharge the air or other gases in the pressurized oil tank and oil cylinder in the hydraulic system from the hydraulic system It does not cause oil leakage, does not require opening and closing pressure, can be combined with automatic and manual control, and is also suitable for remote control.

The purpose of the present invention is achieved through the following technical solutions: a photoelectric automatic exhaust valve for hydraulic systems, which includes: prisms, photoelectric generators, photoelectric receivers, control circuits, solenoid valves, temperature sensors, pressure sensors , filter screen, valve body, front end cover, rear end cover and sealing ring; wherein, the valve body, front end cover and rear end cover are connected in sequence to form the housing of the photoelectric automatic exhaust valve; between the valve body and the front end cover A sealed cavity is formed, the temperature sensor and the pressure sensor are fixed in the sealed cavity, the prism passes through the front end cover and extends into the sealed cavity, the photoelectric generator and the photoelectric receiver are fixed vertically above the prism in the rear end cover, And all connected with the control circuit; the solenoid valve is fixed between the front end cover and the rear end cover and communicated with the sealed cavity; the solenoid valve, temperature sensor and pressure sensor are all connected with the control circuit; the entrance of the sealed cavity is opened on the valve body , A filter screen is installed at the entrance, and a sealing groove is opened at the bottom of the valve body, and a sealing ring is installed in it.

Further, it also includes a first gasket installed between the solenoid valve and the front end cover; the first gasket has a damping hole and connects with the solenoid valve.

Further, a second gasket supporting the filter net is also included.

Further, the control circuit includes a single-chip microcomputer, a proportional amplifier, a resistor R and three signal conditioners, and the three I/O ports of the single-chip microcomputer are respectively connected to the temperature sensor through the first signal conditioner, and connected to the pressure sensor through the second signal conditioner. The sensors are connected, the cathode of the photoelectric receiver is connected to one end of the resistor R through the third signal conditioner, the anode of the photoelectric generator is connected to the anode of the photoelectric receiver, and the cathode of the photoelectric generator and the other end of the resistor R are both grounded. The input end of the proportional amplifier is connected with an I/O of the microcontroller, and the output end is connected with the solenoid valve.

The beneficial effect of the present invention is: the present invention is used in the photoelectric automatic exhaust valve of the hydraulic system, and the exhaust of the exhaust valve is related to the height of the liquid level, and has nothing to do with the opening and closing pressure of the system; multiple parameters are measured and controlled at the same time, which improves the Invention stability; electronic control, fast response speed of exhaust valve, high degree of automation; manual and electric can be selected by yourself, providing initial control and emergency handling; the circuit is installed outside the exhaust valve, with strong adjustable performance.

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

Description of drawings

Fig. 1 is the structural representation of the photoelectric automatic exhaust valve that the present invention is used for hydraulic system;

Fig. 2 is the structural diagram of control circuit;

Fig. 3 is a software control flowchart;

In the figure, prism 1, photoelectric generator 2, photoelectric receiver 3, control circuit 4, solenoid valve 5, temperature sensor 6, pressure sensor 7, filter screen 8, valve body 9, front end cover 10, rear end cover 11, connection Screw 12, sealing ring 13, first gasket 14, second gasket 15.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

The photoelectric automatic exhaust valve used in the hydraulic system of the present invention includes: a prism 1, a photoelectric generator 2, a photoelectric receiver 3, a control circuit 4, a solenoid valve 5, a temperature sensor 6, a pressure sensor 7, a filter screen 8, and a valve body 9 , Front end cover 10, rear end cover 11, sealing ring 13.

The valve body 9, the front end cover 10 and the rear end cover 11 are sequentially connected to form a housing of a photoelectric automatic exhaust valve for a hydraulic system. A sealed cavity is formed between the valve body 9 and the front end cover 10, the temperature sensor 6 and the pressure sensor 7 are fixed in the sealed cavity, the prism 1 passes through the front end cover 10 and extends into the sealed cavity, the photoelectric generator 2 and the photoelectric receiver Devices 3 are all vertically fixed above the prism 1 in the rear end cover 11, and are all connected with the control circuit 4. The electromagnetic valve 5 is fixed between the front end cover 10 and the rear end cover 11 and communicates with the sealed cavity, and a first gasket 14 is installed between the electromagnetic valve 5 and the front end cover 10 . The electromagnetic valve 5 , the temperature sensor 6 and the pressure sensor 7 are all connected to the control circuit 4 . The clearance fit inside the electromagnetic valve 5 and the small hole of the spool connect the sealed cavity with the atmosphere. The valve body 9 is provided with an entrance of a sealed cavity, and a filter screen 8 is installed at the entrance, and the filter screen 8 is supported by a second gasket 15 . The bottom of valve body 9 also has sealing groove, and sealing ring 13 is installed in it.

The valve body 9 is connected with the oil tank or the cylinder body through the screw 12, the sealing ring 13 is used to prevent oil leakage, and the first gasket 14 supports the filter screen 8 to filter oil impurities and improve the internal cleanliness of the exhaust valve. The prism 1 is installed inside the sealed volume between the valve body 9 and the front end cover 10 . The photoelectric generator 2 is installed vertically above the prism, and is used to generate light and transmit it to the left half of the prism 1 for refraction; when the liquid level height condition is satisfied, the prism 1 reflects the light to the photoelectric receiver 3 and transmits it to the control circuit. The temperature sensor 6 and the pressure sensor 7 are placed in the sealed volume between the valve body 9 and the front end cover 10 to measure the internal pressure and temperature parameters of the system and transmit them to the control circuit. The first gasket 14 has a damping hole and is connected with the solenoid valve 5 . The control circuit 4 is connected with the photoelectric generator 2, the photoelectric receiver 3, the solenoid valve 5, the temperature sensor 6, and the pressure sensor 7 through wires, receives signals from the sensors, and controls the opening size and control time of the solenoid valve 5.

As shown in Figure 2, the control circuit 4 includes a single-chip microcomputer, a proportional amplifier, a resistor R and three signal conditioners, and the three I/O ports of the single-chip microcomputer are respectively connected to the temperature sensor 6 through the first signal conditioner, and the temperature sensor 6 is connected through the second signal conditioner. The device is connected with the pressure sensor 7, the cathode of the photoelectric receiver is connected with one end of the resistor R through the third signal conditioner, the anode of the photoelectric generator 2 is connected with the anode of the photoelectric receiver 3, the cathode of the photoelectric generator 2 is connected with the resistor R Both ends are grounded. The input end of the proportional amplifier is connected with an I/O of the single-chip microcomputer, and the output end is connected with the solenoid valve 5 .

As shown in FIG. 3 , the I/O port of the microcontroller receives signals from the photoelectric receiver 3 , the temperature sensor 6 and the pressure sensor 7 . Once the three input signals are satisfied at the same time, another I/O port of the microcontroller controls the proportional amplifier, and then drives and controls the working time and opening of the solenoid valve to discharge the gas. Once the working time set by the single-chip microcomputer is exceeded, or the signals of the temperature sensor 6 and the pressure sensor 7 do not meet the conditions, the single-chip microcomputer returns to the waiting state and waits for the next condition to be satisfied.

The working process of the present invention is as follows: at the beginning, the sealed cavity is filled with oil, and the solenoid valve 5 spool mainly relies on the spring force to balance the pressure in the cavity; at the same time, the light generated by the photoelectric generator 2 is refracted by the prism 1, and the photoelectric receiver 3 There is no input signal, and other parameters are normal; the control circuit 4 does not output a signal to control the solenoid valve 5, and the solenoid valve 5 is in a closed state. As the hydraulic system works, gas begins to build up in the tank or cylinder. Gas passes through the orifice below the valve body 9, passes through the filter 8, and enters the sealed cavity of the exhaust valve. Slowly the gas accumulates, and the liquid level in the sealed cavity drops; when the liquid level drops to the set height, the light generated by the photoelectric generator 2 is totally reflected at the prism 1, and the photoelectric receiver 3 receives the light signal and sends The signal is transmitted to the single-chip microcomputer in the control circuit 4. If the temperature sensor 6 and the pressure sensor 7 meet the set values in the single-chip microcomputer at the same time, the control circuit 4 drives the solenoid valve 5 to open, and the gas passes through the damping hole of the first gasket 14 and the internal design of the solenoid valve 5 to connect the sealed cavity and the atmosphere. exhaust. The single-chip microcomputer controls the opening size and opening maintenance time of the solenoid valve 5 through the proportional amplifier, and the gas is discharged. After the gas is discharged, the liquid level in the sealed cavity rises, the light passing through the prism 1 changes from total reflection to refraction, and the photoelectric receiver 3 cannot receive the input signal. Or the predetermined delay time of the single-chip microcomputer or parameters such as temperature and pressure do not meet the predetermined requirements, the solenoid valve 5 stops working, the valve core is balanced to the original closed position by the spring, the whole system is closed, the exhaust is completed, and waits for the next exhaust.

The specific embodiments above are used to explain the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (1)

1. the photoelectric automatic exhaust valve for hydraulic system, it is characterized in that, it comprises: prism (1), photocurrent generator (2), photelectric receiver (3), control circuit (4), solenoid valve (5), temperature transducer (6), pressure transducer (7), filter screen (8), valve body (9), front cover (10), rear end cover (11) and seal ring (13); Wherein, described valve body (9), front cover (10) are connected successively with rear end cover (11), form the housing of photoelectric automatic exhaust valve; Sealed volume is formed between valve body (9) and front cover (10), temperature transducer (6) and pressure transducer (7) are fixed in sealed volume, prism (1) is through front cover (10) and stretch in sealed volume, photocurrent generator (2) and photelectric receiver (3) are all vertically fixed on prism (1) top in rear end cover (11), and are all connected with control circuit (4); Solenoid valve (5) to be fixed between front cover (10) and rear end cover (11) and to communicate with sealed volume; Solenoid valve (5), temperature transducer (6) are all connected with control circuit (4) with pressure transducer (7); Valve body (9) has the entrance of sealed volume, filter screen (8) is installed in ingress, and the bottom of valve body (9) also has seal groove, installs seal ring (13) in it; This photoelectric automatic exhaust valve also comprises the second pad (15) that first pad (14) and be arranged between solenoid valve (5) and front cover (10) supports filter screen (8); Described first pad (14) has damping hole, connects with solenoid valve (5); Described control circuit (4) comprises single-chip microcomputer, proportional amplifier, resistance R and three signal conditioner, three I/O mouths of single-chip microcomputer are connected with temperature transducer (6) respectively by the first signal conditioner, be connected with pressure transducer (7) by secondary signal conditioner, the negative electrode of photelectric receiver and one end of resistance R is connected by the 3rd signal conditioner, the anode of photocurrent generator (2) is connected with the anode of photelectric receiver (3), the negative electrode of photocurrent generator (2) and the equal ground connection of the other end of resistance R; The input end of proportional amplifier is connected with single-chip microcomputer I/O, and output terminal is connected with solenoid valve (5).