This patent was applied by Beijing Hua Chong Long Run Environmental Technology Co., Ltd., and was authorized notice on March 15, 2017. Description of content The present invention relates to the field of valve technology, in particular to a large aperture gas dielectric media electric valve. BACKGROUND OF THE INVENTION There are many kinds of valves in the prior art, such as ball valves, butterfly valves, gate valves and the like. These valves, like ball valves and butterfly valves, are mainly used for liquid sluice control. The sluice control for gas is extremely bulky, expensive and tight Not enough. Gate valve used in the gas fluid to open and close, due to structural reasons, can not achieve the sealing function, and the large diameter of the valve is small, expensive. SUMMARY OF THE INVENTION The present invention provides a large aperture gas dielectric media valve used in gas channel sealing, compared to the ball valve, butterfly valve, gate valve, not only more lightweight, but also greatly improve the sealing performance of the valve, can produce a variety of large diameter valves, Suitable for all kinds of ventilation pipelines, it completely solves the technical problems that the application of gate valve on gas fluid, especially large diameter valve, can not be sealed on gas fluid. The technical scheme of the present invention is realized as follows: the large-aperture gas-medium electric valve includes an outer shell, a base plate and an auxiliary base plate respectively mounted on the outer shell body, the base plate is disposed above the auxiliary base plate, A plurality of guide posts are arranged between the substrate and the auxiliary substrate, a pressure plate and a shutter for controlling the opening and closing of the vents are slidably mounted on the guide posts, a gap between the pressure plate and the shutter An elastic element is connected to the platen, a linear driving device for driving the platen to reciprocate up and down is connected, an upper limit position sensor for detecting the relative position between the platen and the shutter is arranged on the platen, A lower limit position sensor for detecting the relative position between the pressure plate and the auxiliary substrate. Preferably, an elastic sealing gasket is arranged between the shutter and the vent of the substrate. A sealing oil groove is arranged on the lower surface of the substrate, and sealing grease is arranged in the sealing oil groove. The linear driving device includes a nut fixedly mounted on the pressure plate, a screw rod is mounted inside the nut, a deceleration motor is connected to the screw rod, and the deceleration motor is fixedly mounted on the auxiliary shutter plate. A connecting pin is arranged between the pressure plate and the gate plate. The shutter is provided with a seal for sealing the gap between the lead screw and the shutter. The number of the guide posts is four, the elastic element comprises four springs in one-to-one correspondence with the guide posts, and each of the springs is sheathed on the corresponding guide posts. A first mechanical limit switch for protecting the geared motor after the upper limit position sensor is damaged is provided on the gate, and a second mechanical limit for protecting the geared motor after the lower limit position sensor is damaged is provided on the auxiliary base plate switch. The advantages of the present invention are as follows: Since the outer shell of the large aperture gas medium electric valve is respectively provided with a base plate and an auxiliary base plate, the base plate is provided with a vent hole, the pressure plate and the gate plate are slidably mounted on the guide column, An elastic element is arranged between the pressure plate and the ram. The pressure plate is connected with a linear driving device which drives the reciprocating motion up and down. The pressure plate is provided with an upper position sensor, and a lower position sensor is arranged on the auxiliary substrate. During work, the geared motor drives the screw to rotate. The nut on the presser plate converts the rotational movement of the screw into an up-and-down movement of the presser plate. The presser plate moves up and down through the spring to move the gate plate upwards and downwards, so as to realize the valve opening and closing. When it is needed to close the valve, the gear motor shaft drives the screw to rotate. There is a nut matched with the screw in the pressure plate, the screw rod causes the pressure plate to move upward, and the four guide columns ensure the balance of the pressure plate during the movement. To the top, the platen pressed against the spring, the spring pressed against the ram, the ram and the substrate between the elastic seal washer, the gasket is coated with sealing grease around the ram, the gas circuit is closed. The upper limit position sensor detects that the pressure plate reaches the determined relative position with the gate plate. The spring accumulates enough pressure to compact and seal the vent hole. The sensor gives a signal to control the deceleration motor to stop rotating. After the gate plate closes the vent hole, No longer continue to exercise, both to ensure that the gate compaction, but also to avoid mechanical damage. When you need to open the valve, the motor shaft to do the reverse rotation, the same, the lower limit position sensor plate reaches a given position, the signal is given, the motor stops rotating, to achieve the valve open. The present invention has the following advantages in the structure of the spring, first, to ensure that the pressure required by the gate, with the four guide posts, so that the gate force uniform; second, to the motor operation to allow sufficient reaction space , The motor turn more or less turn to ensure the sealing effect, and effective protection of valve quality and life; Third, through the pressure plate gate connecting pin to the spring an initial pressure, so that the gate and platen to maintain a square Relative position, so that the screw rotation, the gate plate can slide freely on the guide column will not get stuck, the inventor creatively designed the electric valve stack plate seal structure, the valve seal depends on the The pressure between the gate and the elastic gasket, the gasket has a certain elasticity, as long as the gate can reach a certain pressure, can do a good seal, a substantial increase in the sealing performance of the valve. Because the lower surface of the substrate is provided with a sealing oil groove, the sealing effect of the elastic gasket is further supplemented. Because of the seal on the gate, you can effectively seal the gap between the screw and the gate. Since the first mechanical limit switch is provided on the shutter, the second mechanical limit switch is provided on the auxiliary substrate. If the upper limit position sensor is damaged, when the pressure plate and the shutter are excessively close to each other, the first mechanical limit switch is normally closed When the lower limit position sensor is damaged, the pressure plate and the auxiliary substrate are too close to each other, the second mechanical limit switch normally closed contact is disconnected, and the geared motor stops supplying power, so as to better protect the valve from being damaged damage. In summary, the present invention is applied to gas channel sealing, not only more portable than ball valves, butterfly valves, gate valves, but also greatly improve the sealing performance of the valve can produce a variety of large diameter valves suitable for a variety of ventilation lines , Completely solve the gate valve applications in the gas fluid, especially large-diameter valves in the gas fluid can not be sealed on the technical problems, in the field of valve has far-reaching significance.
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