Pressure balanced gate and method of use

Abstract

The application discloses a pressure balance type gate and an application method thereof, which comprises a cavity structure provided with a door hole, a gate plate provided in penetrating cooperation with the cavity structure, a sealing assembly provided at the edge opening of the cavity structure and matched with the gate plate, a linear driving device connected with the gate plate, a gate plate protection cover sealingly connected with the cavity structure, wherein one end of the gate plate extending out of the edge opening and the driving part of the linear driving device are located in the gate plate protection cover, and the inner cavity of the gate plate protection cover is connected with an air pressure adjusting system. The gate plate protection cover can effectively prevent impurities such as mud from adhering to the gate plate, and reduce the frictional resistance when the gate plate is opened and closed. When applied to a device with internal and external pressure difference, the air pressure adjusting system pressurizes the gate plate protection cover, the pressure in the gate plate protection cover can balance the internal and external pressure difference of the gate plate when the gate plate is opened and closed, the frictional resistance when the gate plate is opened and closed is reduced, and meanwhile, the pressure loss of the linear driving device when the gate is opened and closed is also reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gate, in particular to a pressure balance type gate and its application method. BACKGROUND

[0002] The shield machine is a commonly used engineering machinery in today's underground tunnel engineering. The gate is used in many places of the shield machine to isolate high-pressure environment, such as the normal-pressure tool changing sealing device of the normal-pressure cutter head, the gate at the shield body partition, the gate at the screw machine slag outlet, etc. The gate in the prior art has the problem of mud and other impurities during use. In addition, the cleaning is not in place, and after a period of use, the mud is attached and consolidated on the surface of the gate, resulting in increased frictional resistance when the gate is closed, increased pressure of the oil cylinder closing the gate, and serious influence on the smoothness of the gate closing. Although the outer surface of the gate can be manually cleaned, many positions are narrow in space and difficult to clean thoroughly. For example, a tunneling machine normal-pressure tool changing single gate disclosed in a Chinese utility model patent with an authorized announcement date of February 14, 2022 and an authorized announcement number of CN 210068162 U, includes a front cover and a rear cover fixedly connected, forming a cavity therebetween, a sealing assembly is arranged at the edge of the cavity, a cutter plate is further arranged in the cavity, and a driving device is further arranged at the connecting side surface of the front cover and the rear cover, which can drive the cutter plate to reciprocate in and out of the cavity.

[0003] Although a method and structure for preventing mud and water from entering the precision fitting part of the shield tool changing gate valve disclosed in a Chinese invention patent application with an application publication date of August 9, 2022 and an authorized announcement number of CN 114877087 A, the method is to inject sealing grease into the cavity formed by the outer cylinder of the roller cutter, the mud water side valve body, the tool changing side valve body and the left and right gate plates, so that the sealing grease fills and reaches the precision fitting part. In the process of roller cutter replacement, the sealing grease is used to prevent the external mud and water from contacting the precision fitting part, thereby protecting the precision fitting part inside the shield tool changing gate valve. However, with the consumption and pollution of the sealing grease, the problem of increased frictional resistance when the gate is closed and increased pressure of the oil cylinder closing the gate still exists.

[0004] In addition, the gate used to isolate the high-pressure environment will be hindered by the pressure from the high-pressure environment when it is closed, which puts higher requirements on the rated pressure of the oil cylinder. However, in many cases, the size of the oil cylinder is limited by space, and the size of the oil cylinder cannot be increased, so the closing pressure of the gate cannot be increased. Therefore, how to reduce the closing resistance of the gate and increase the closing pressure of the gate is a problem that needs to be solved urgently. SUMMARY

[0005] In view of the deficiencies in the above background art, the present application provides a pressure balance type gate and its application method, which solves the technical problems of high closing resistance of the existing gate and limited closing pressure of the gate.

[0006] The technical scheme of the present application is:

[0007] A pressure balance type gate comprises a cavity structure provided with a door hole, a gate plate provided in penetrating cooperation with the cavity structure, a sealing assembly provided at the edge opening of the cavity structure and matched with the gate plate, a linear driving device connected with the gate plate, a gate plate protection cover sealingly connected with the cavity structure, an end of the gate plate extending out of the edge opening and a driving part of the linear driving device are located in the gate plate protection cover, and an air pressure adjusting system is connected with the inner cavity of the gate plate protection cover. The gate plate protection cover is a closed space, which can effectively prevent impurities such as mud from adhering to the gate plate, thereby reducing the frictional resistance when the gate plate is opened and closed. When applied to a device with internal and external pressure difference, the air pressure adjusting system pressurizes the gate plate protection cover, and the pressure in the gate plate protection cover can balance the internal and external pressure difference of the gate plate when the gate plate is opened and closed, thereby avoiding the tendency of the gate plate to tilt, reducing the frictional resistance when the gate plate is opened and closed, and reducing the pressure loss when the linear driving device opens and closes the gate, so that the linear driving device can realize higher driving capacity without increasing the size, thereby solving the technical problem of limited installation space.

[0008] Further, the cavity structure comprises a rear sealing seat and a front sealing seat connected with each other, the door hole penetrates through the rear sealing seat and the front sealing seat, the sealing assembly is located between the door hole penetrating through the rear sealing seat and the front sealing seat, the gate plate is slidingly arranged between the rear sealing seat and the front sealing seat, and the gate plate protection cover is connected at the end of the rear sealing seat and the front sealing seat.

[0009] Further, the linear driving devices are arranged in pairs and located at two sides of the cavity structure, and the driving parts are arranged in parallel with the gate plate and connected at the outer end of the gate plate.

[0010] Further, the linear driving device is a hydraulic oil cylinder or an electric telescopic cylinder, which can drive the gate plate to extend and retract along the cavity structure to realize opening and closing.

[0011] Further, when the linear driving device is a hydraulic oil cylinder, the hydraulic cylinder of the hydraulic oil cylinder is connected with the cavity structure, and the piston rod is located at one side of the gate plate. The piston rods at two sides of the gate plate are connected through a connecting plate, the connecting plate is provided with a clamping groove, the gate plate is inserted into the clamping groove and connected with the connecting plate through a fixing pin.

[0012] Further, the edge opening comprises a left edge opening and a right edge opening, two gate plate protection covers are symmetrically arranged about the cavity structure, two gate plates are arranged in the cavity structure, and the two gate plates are symmetrically arranged left and right. The outer end of one of the gate plates extends and retracts in the left gate plate protection cover through the left edge opening, and the outer end of the other gate plate extends and retracts in the right gate plate protection cover through the right edge opening.

[0013] Further, the edge port includes an inner edge port at the door hole, and a sealing assembly arranged at the inner edge port is sealingly matched with the gate plate when the gate plate is closed.

[0014] Further, the gate plate is immersed in the hydraulic oil or lubricant, which can play a lubricating role and prevent the gate plate from being corroded, thereby enhancing the smoothness of the opening and closing of the gate.

[0015] Further, the cavity structure is provided with a high-pressure flushing unit for flushing the door hole, which is used for flushing the gate plate and the sealing assembly at the door hole.

[0016] Further, the high-pressure flushing unit includes a spray head arranged therein, and the spray head is in communication with the inner cavity of the gate plate protection cover through a solenoid valve, so that the gate plate and the sealing assembly at the door hole can be flushed by the high-pressure gas in the gate plate protection cover.

[0017] An application method of the pressure balance type gate, including the pressure balance type gate according to any one of the preceding embodiments, the pressure balance type gate being installed on a device having a pressure difference between the inside and the outside, and the application method comprising:

[0018] ① Before the gate plate is closed: the gate plate protection cover is pressurized by the air pressure adjusting system, and the pressure in the gate plate protection cover is balanced with the pressure on the high-pressure side of the device or is higher than the pressure on the high-pressure side of the device;

[0019] ② During the closing of the gate plate: the gate plate is gradually closed to the door hole by the linear driving device, and the pressure in the gate plate protection cover is supplemented by the air pressure adjusting system, so that the pressure in the gate plate protection cover is always balanced with or higher than the pressure on the high-pressure side of the device;

[0020] ③ After the gate plate is closed, the pressure in the gate plate protection cover is released;

[0021] ④ When the gate plate is opened, the gate plate is gradually opened to the door hole by the linear driving device.

[0022] An application method of the pressure balance type gate, including the pressure balance type gate according to any one of the preceding embodiments, the pressure balance type gate being installed on a device having a pressure difference between the inside and the outside, and the application method comprising:

[0023] ① Before the gate plate is closed: the gate plate protection cover is pressurized by the air pressure adjusting system, and the pressure in the gate plate protection cover is balanced with the pressure on the high-pressure side of the device or is higher than the pressure on the high-pressure side of the device, and the solenoid valve is controlled to be opened to clean the gate plate and the sealing assembly at the door hole by the spray head;

[0024] ② During the gate closure process: The gate is gradually closed by a linear drive device, and the air pressure regulation system replenishes the pressure inside the gate protective cover to ensure that the pressure inside the gate protective cover is always balanced with or higher than the pressure on the high-pressure side of the equipment.

[0025] ③ After the gate is closed, maintain a constant pressure inside the gate protective cover; or release the pressure inside the gate protective cover through the solenoid valve and nozzle to flush the gate located in the cavity structure;

[0026] ④ When the gate is opened, the gate is gradually opened by the linear drive device. If the pressure inside the gate cover is kept constant after the gate is closed, the solenoid valve is directly controlled to open so that the nozzle cleans the sealing components at the gate and the door opening. If the pressure inside the gate cover is released after the gate is closed, the air pressure regulating system is first used to pressurize the gate cover, and then the solenoid valve is controlled to open so that the nozzle cleans the sealing components at the gate and the door opening.

[0027] The gate guard in this invention effectively protects the cleanliness of the gate and the linear drive device, solving the technical problem of mud adhering to the gate surface and making the gate difficult to close due to harsh working environments. Simultaneously, a pressure regulating system can pressurize the inside of the gate guard to balance the pressure difference between the inside and outside of the gate, allowing the linear drive device to balance the pressure exerted on the gate by the high-pressure side in the construction environment, thus solving the technical problem of insufficient driving force in the linear drive device. According to this invention, after using the gate guard, the gate of the atmospheric pressure knife-changing sealing device assembly can open and close smoothly multiple times for extended periods. The linear drive device can actively exert more force on the gate, solving the technical problem of mud adhering to the gate surface in existing working environments, leading to increased gate opening and closing resistance, insufficient cylinder closing pressure, and difficulty in closing the gate. Attached Figure Description

[0028] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an exploded view of Embodiment 1 of the present invention;

[0030] Figure 2 for Figure 1 Assembly drawing;

[0031] Figure 3 for Figure 1 Structural diagram omitting the gate guard cover;

[0032] Figure 4 for Figure 2A partial sectional view;

[0033] Figure 5 for Figure 4 Enlarged view of section I;

[0034] Figure 6 This is an assembly diagram of Embodiment 2 of the present invention;

[0035] Meaning of the labels in the diagram:

[0036] Atmospheric pressure changer seal assembly 1, gate guard 2, valve 3, bolt 4, seal 5, rear seal 101, front seal 102, drive cylinder 103, connecting plate 104, gate 105, fixing pin 106. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] A pressure-balanced gate, such as Figure 3 As shown, the device includes a cavity structure with a doorway, and a gate 105 that is interlocked with the cavity structure. A sealing assembly that mates with the gate 105 is provided at the edge of the cavity structure. The gate 105 is connected to a linear drive device, which can extend and retract the gate 105 along the cavity structure, thereby opening and closing the doorway. The linear drive device is either a hydraulic cylinder 103 or an electric telescopic cylinder, capable of extending and retracting the gate 105 along the cavity structure to achieve opening and closing.

[0039] like Figure 1 and Figure 2 As shown, the cavity structure is sealed with a gate protective cover 2. The end of the gate 105 extending from the edge opening and the drive unit of the linear drive device are both located inside the gate protective cover 2. An air pressure regulating system is connected to the inner cavity of the gate protective cover 2. The gate protective cover 2 is a sealed space, effectively preventing impurities such as mud from adhering to the gate 105 and reducing the frictional resistance when the gate 105 is opened and closed. When applied to equipment with an internal and external pressure difference, the air pressure regulating system pressurizes the gate protective cover 2. When the gate 105 is opened and closed, the pressure inside the gate protective cover 2 can balance the pressure difference between the inside and outside of the gate, preventing the gate from tilting. This reduces the frictional resistance when the gate 105 is opened and closed, and also reduces the pressure loss when the linear drive device opens and closes the gate. Higher driving capacity can be achieved without increasing the specifications of the linear drive device, thus solving the technical problem of limited installation space.

[0040] In a preferred embodiment of the pressure-balanced gate, the cavity structure includes a rear sealing seat 101 and a front sealing seat 102 connected to each other, the gate opening passes through the rear sealing seat 101 and the front sealing seat 102, the sealing assembly is located between the gate opening and the rear sealing seat 101 and the front sealing seat 102, the gate plate 105 is slidably disposed between the rear sealing seat 101 and the front sealing seat 102, and the gate plate protective cover 2 is connected to the ends of the rear sealing seat 101 and the front sealing seat 102.

[0041] In a preferred embodiment of the pressure-balanced gate, the linear drive devices are arranged in pairs and located on both sides of the cavity structure, and the drive unit is arranged parallel to the gate plate 105 and connected to the outer end of the gate plate 105.

[0042] In a preferred embodiment of the pressure-balanced gate, when the linear drive device is a hydraulic cylinder 103, the hydraulic cylinder 103 is connected to the cavity structure, the piston rod is located on one side of the gate plate 105, and the piston rods on both sides of the gate plate 105 are connected by a connecting plate 104. The connecting plate 104 is provided with a slot, the gate plate 105 is inserted into the slot and connected to the connecting plate 104 by a fixing pin 106.

[0043] As a preferred embodiment of the pressure-balanced gate, the edge opening includes a left edge opening and a right edge opening. Two gate protective covers 2 are symmetrically arranged about the cavity structure. Two gates 105 are arranged inside the cavity structure. The two gates 105 are symmetrically arranged from left to right. The outer end of one gate 105 extends and retracts within the gate protective cover 2 on the left side through the left edge opening, and the outer end of the other gate 105 extends and retracts within the gate protective cover 2 on the right side through the right edge opening, forming a typical double gate structure.

[0044] As a preferred embodiment of a pressure-balanced gate, such as Figure 6 As shown, the gate protective cover 2 and the gate 105 are configured as one, which can form a single gate structure.

[0045] In a preferred embodiment of the pressure-balanced gate, the edge opening includes an inner edge opening at the gate opening. When the gate 105 is closed, the sealing component provided at the inner edge opening is sealed and engaged with the gate 105.

[0046] As a preferred embodiment of the pressure-balanced gate, the gate guard 2 is provided with hydraulic oil or lubricant, and the gate 105 is immersed in the hydraulic oil or lubricant, which can not only lubricate, but also prevent the gate 105 from corroding and enhance the smoothness of the gate opening and closing.

[0047] As a preferred embodiment of the pressure-balanced gate, the cavity structure is provided with a high-pressure flushing unit for flushing the gate opening and for flushing the gate plate 105 and the sealing components at the gate opening.

[0048] Furthermore, the high-pressure flushing unit includes a nozzle that is connected to the inner cavity of the gate protective cover 2 via a solenoid valve, and the high-pressure gas inside the gate protective cover 2 can be used to flush the gate 105 and the sealing components at the door opening.

[0049] As a preferred embodiment of the pressure-balanced gate, it is applied in the atmospheric pressure cutterhead replacement structure of a tunnel boring machine, such as... Figures 1-5 As shown, the main components include the following: atmospheric pressure tool changer seal assembly 1, gate guard 2, valve 3, bolt 4, seal 5, rear seal 101, front seal 102, drive cylinder 103, connecting plate 104, gate 105, and fixing pin 106.

[0050] The installation process is as follows: The rear sealing seat 101 and the front sealing seat 102 are fixedly connected to form an internal cavity. The drive cylinder 103 is fixed to the side of the rear sealing seat 101 and the front sealing seat 102. The cylinder rods of the cylinders 103 on both sides of the sealing seat are bolted to the connecting plate 104. One end of the connecting plate 104 is fixed to the gate 105 by a fixing pin 106, and the other end is placed in the cavity of the sealing seat. This completes the assembly of the atmospheric pressure knife-changing sealing device assembly 1. Then, the valve 3 and the seal 5 are installed on the pressurizable gate protective cover 2. Finally, the gate protective cover 2 is fixed to the atmospheric pressure knife-changing sealing device assembly 1 with bolts 4.

[0051] The pressurized gate cover 2 is a sealed space that can effectively prevent impurities such as mud from adhering to the gate 105.

[0052] The pressurizable gate guard 2 can be pressurized by the vent valve 3. When changing the blade, especially when the gate 105 is closed, the internal pressure can be increased to balance the pressure difference inside and outside the gate 105 and reduce the pressure loss when the drive cylinder 103 closes the gate.

[0053] A method for applying a pressure-balanced gate, comprising the pressure-balanced gate as described above, wherein the pressure-balanced gate is installed on equipment with a pressure difference between the inside and outside, and the method includes:

[0054] ① Before the gate is closed: pressurize the gate protective cover 2 through the air pressure regulation system until the pressure inside the gate protective cover 2 is equal to the pressure on the high-pressure side of the equipment, or pressurize the gate protective cover 2 until the pressure inside the gate is higher than the pressure on the high-pressure side of the equipment;

[0055] ② During the gate closure process: The gate 105 is driven by a linear drive device to gradually close the gate opening. At the same time, the air pressure regulation system replenishes the pressure inside the gate protective cover 2 to ensure that the pressure inside the gate protective cover 2 is always balanced with or higher than the pressure on the high-pressure side of the equipment.

[0056] ③ After the gate is closed, release the pressure inside the gate protective cover 2;

[0057] ④ When the gate is opened, the gate 105 is driven by a linear drive device to gradually open the doorway.

[0058] Another application method of pressure-balanced gates includes the pressure-balanced gates described in any of the above-mentioned embodiments, wherein the pressure-balanced gates are installed on equipment with a pressure difference between the inside and outside, and the application method includes:

[0059] ① Before the gate closes: Pressurize the gate protective cover 2 through the air pressure regulation system until the pressure inside the gate protective cover 2 is equal to the pressure on the high-pressure side of the equipment, or pressurize the pressure inside the gate protective cover 2 to be higher than the pressure on the high-pressure side of the equipment, and control the solenoid valve to open so that the nozzle cleans the gate and the sealing components at the door opening;

[0060] ② During the gate closure process: The gate 105 is driven by a linear drive device to gradually close the gate opening. At the same time, the air pressure regulation system replenishes the pressure inside the gate protective cover 2 to ensure that the pressure inside the gate protective cover 2 is always balanced with or higher than the pressure on the high-pressure side of the equipment.

[0061] ③ After the gate is closed, maintain a constant pressure inside the gate protective cover 2; or release the pressure inside the gate protective cover 2 through the solenoid valve and nozzle to flush the gate 105 located in the cavity structure;

[0062] ④ When the gate is opened, the gate 105 is driven by the linear drive device to gradually open the doorway. If the pressure inside the gate cover 2 remains constant after the gate is closed, the solenoid valve is directly controlled to open so that the nozzle cleans the gate 105 and the sealing components at the doorway. If the pressure inside the gate cover 2 is released after the gate is closed, the gate cover 2 is pressurized first through the air pressure regulation system, and then the solenoid valve is controlled to open so that the nozzle cleans the gate 105 and the sealing components at the doorway.

[0063] As the optimal application method for pressure-balanced gates, these gates are used at the cutterhead replacement point of tunnel boring machines under normal pressure. During cutterhead replacement, the gate plate protective cover 2 only needs to be pressurized when the gate is closed; it does not need to be pressurized when the gate is open. Specifically:

[0064] (1) Before closing the gate, pressurize the gate protective cover 2 to balance the pressure at the working face, or pressurize it slightly higher than the working face pressure. The working face pressure can be viewed from the main control room of the tunnel boring machine. The specific pressurization amount can be viewed by installing a pressure gauge on the air intake pipe. Since the space inside the gate protective cover 2 is increasing when the gate is closed, pressurization is required during the gate closing process to ensure the pressure level.

[0065] (2) After the gate is closed, release the pressure inside the gate guard 2 to balance the atmospheric pressure, so as to ensure that the gate guard 2 is not pressurized when the cutter head is working; when the cutter head is working, the gate is normally closed.

[0066] (3) When the gate is open, no pressure is needed inside the gate guard 2, and the driving capacity of the 103 hydraulic cylinder is sufficient to open the gate;

[0067] (4) The sealed cavity of the gate protective cover 2 can be filled with an appropriate amount of hydraulic oil and lubricant to keep the gate in an oil-immersed state, prevent the gate from corroding, and enhance the smoothness of the gate opening and closing.

[0068] All aspects not detailed in this invention are conventional technical means known to those skilled in the art.

[0069] The above content shows and describes the basic principles, main features, and beneficial effects of the present invention. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of using a pressure balanced gate, the method comprising: The pressure balance type gate comprises a cavity structure provided with a door hole, a gate plate (105) provided in the cavity structure in a penetrating manner, a sealing assembly provided at the edge of the cavity structure and matched with the gate plate (105), a linear driving device connected with the gate plate (105), a gate plate protection cover (2) sealingly connected with the cavity structure, an end of the gate plate (105) extending out of the edge and a driving part of the linear driving device are located in the gate plate protection cover (2), and an air pressure adjusting system is connected with an inner cavity of the gate plate protection cover (2); a high-pressure flushing unit for flushing the door hole is arranged in the cavity structure, and the high-pressure flushing unit comprises a spray head, and the spray head is communicated with the inner cavity of the gate plate protection cover (2) through an electromagnetic valve; ​ The pressure balance type gate is installed on a device with pressure difference between the inside and the outside, and the application method comprises: ① Before the gate plate is closed: the gate plate protection cover (2) is pressurized by the air pressure adjusting system, the pressure in the gate plate protection cover (2) is balanced with the pressure on the high-pressure side of the device, or the pressure in the gate plate protection cover (2) is higher than the pressure on the high-pressure side of the device, the electromagnetic valve is controlled to be opened to make the spray head clean the sealing assembly at the gate plate and the door hole; ② During the closing process of the gate plate: the gate plate (105) is gradually closed to the door hole by the linear driving device, and the pressure in the gate plate protection cover (2) is supplemented by the air pressure adjusting system, so that the pressure in the gate plate protection cover (2) is always balanced with or higher than the pressure on the high-pressure side of the device; ③ After the gate plate is closed, the pressure in the gate plate protection cover (2) is kept constant; or the pressure in the gate plate protection cover (2) is released through the electromagnetic valve and the spray head, and the gate plate (105) located in the cavity structure is flushed; ④ When the gate plate is opened, the gate plate (105) is gradually opened by the linear driving device, if the pressure in the gate plate protection cover (2) is kept constant after the gate plate is closed, the electromagnetic valve is directly controlled to be opened to make the spray head clean the sealing assembly at the gate plate (105) and the door hole; if the pressure in the gate plate protection cover (2) is released after the gate plate is closed, the gate plate protection cover (2) is pressurized by the air pressure adjusting system, and then the electromagnetic valve is controlled to be opened to make the spray head clean the sealing assembly at the gate plate (105) and the door hole.

2. The method of using a pressure balanced gate according to claim 1, wherein: The cavity structure comprises a rear sealing seat (101) and a front sealing seat (102) connected with each other, the door hole penetrates through the rear sealing seat (101) and the front sealing seat (102), the sealing assembly is located between the door hole and the rear sealing seat (101) and the front sealing seat (102), the gate plate (105) is slidingly arranged between the rear sealing seat (101) and the front sealing seat (102), and the gate plate protection cover (2) is connected at the end of the rear sealing seat (101) and the front sealing seat (102).

3. The method of using a pressure balanced gate according to claim 1 or 2, wherein: The linear driving devices are arranged in pairs and located at two sides of the cavity structure, the driving parts are arranged in parallel with the gate plate (105) and connected at the outer end of the gate plate (105).

4. The method of using a pressure balanced gate according to claim 3, wherein: The linear driving device is a hydraulic oil cylinder (103) or an electric telescopic cylinder.

5. The method of using a pressure balanced gate according to claim 4, wherein: When the straight line driving device is a hydraulic oil cylinder (103), the hydraulic cylinder of the hydraulic oil cylinder (103) is connected with the cavity structure, the piston rod is located at one side of the shutter (105), the piston rods at two sides of the shutter (105) are connected through the connecting plate (104), the connecting plate (104) is provided with a clamping groove, the shutter (105) is inserted into the clamping groove and connected with the connecting plate (104) through the fixing pin (106).

6. The method of using a pressure balanced gate according to any one of claims 1-2, 4-5, wherein: The edge opening includes a left edge opening and a right edge opening, two shutter protection covers (2) are symmetrically arranged about the cavity structure, two shutters (105) are arranged in the cavity structure and symmetrically arranged left and right, the outer end of one shutter (105) is telescopic in the shutter protection cover (2) at the left side through the left edge opening, and the outer end of the other shutter (105) is telescopic in the shutter protection cover (2) at the right side through the right edge opening.

7. The method of using a pressure balanced gate according to claim 6, wherein: The edge opening includes an internal edge opening at a door hole, and the sealing assembly arranged at the internal edge opening is in sealing cooperation with the shutter (105) when the shutter (105) is closed.

8. The method of using a pressure balanced gate according to any one of claims 1-2, 4-5, 7, wherein: The shutter protection cover (2) is provided with hydraulic oil or lubricant, and the shutter (105) is immersed in the hydraulic oil or lubricant.

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