A high and low temperature resistant high corrosion resistant all-plastic llc type explosion-proof power distribution device and method

Abstract

The application relates to a high-low temperature resistant high-corrosion-resistant full-plastic llC type explosion-proof power distribution device and method, and relates to the technical field of power distribution boxes. The device comprises an electric box body, a rotating rod rotatably connected to the outer side of the electric box body, a sealing door connected to the two ends of the rotating rod, a sealing frame connected to one side of the electric box body, and a side frame body connected to the side of the electric box body. When the sealing door is closed, the wire binding block is driven to move, the wire binding block drives the wire to move, the wire is bound and adjusted through the wire binding block, the wire is bent and attached to the inner side wall of the electric box body, the wire is prevented from being attached to the electric appliance in the electric box body, when the sealing door is opened, the wire binding block is driven to move upwards and gradually reduces the limiting degree of the wire, the wire is prevented from hindering the opening of the sealing door, and the initial position of the wire binding block can be adjusted through the rotating adjusting screw, so that the staff can adjust according to the wire connection condition.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, specifically to a Class IIIC explosion-proof distribution device and method that is resistant to high and low temperatures, highly corrosion-resistant, and made of all-plastic materials. Background Technology

[0002] In power supply systems such as 750 kV and above AC transmission, large-scale power grid security and defense systems, and intelligent dispatching systems, distribution boxes are complete sets of devices used in electrical systems to centrally install switches, protective electrical appliances, measuring instruments, and other components. Based on power electronic components such as metal oxide semiconductor field-effect transistors, insulated gate bipolar transistor chips and modules, they serve as the core link in power distribution and control. Among them, the high and low temperature resistant, high corrosion resistant, all-plastic IIC-class explosion-proof distribution box is a special electrical control device designed for Zone 1 and Zone 2 IIC-class explosive gas environments and highly corrosive locations. It is integrally molded from engineering plastics and has four core advantages: explosion-proof, high and low temperature resistant, strong corrosion resistant, and high insulation. It is widely used in extreme working conditions such as chemical, marine, and metallurgical industries.

[0003] Existing high and low temperature resistant, high corrosion resistant, all-plastic Class IIIC explosion-proof distribution boxes have control or detection instruments mounted on their sealed door surfaces. These instruments need to be connected to the electrical components inside the box via wiring. Due to the opening and closing characteristics of the sealed door, the wiring connecting the instruments to the electrical components is quite long. This causes the wiring to bend randomly during the rotation and closing of the sealed door. Some of the bent wiring will come into contact with the electrical components inside the box, causing heat to accumulate at the contact points, posing a safety risk. Furthermore, the regular bending will accelerate the wear and tear on the wiring.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a high- and low-temperature resistant, high-corrosion-resistant, all-plastic Class IIIC explosion-proof power distribution device and method to solve the technical problem in the above-mentioned background technology that the sealing door of the high- and low-temperature resistant, high-corrosion-resistant, all-plastic Class IIIC explosion-proof power distribution box causes the circuit to bend randomly during the rotation and closing process, and some of the bent circuits will stick to the electrical appliances in the box, resulting in heat accumulation in the circuit and posing a safety risk. This invention provides a solution that is significantly different from the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a Class IIIC explosion-proof power distribution device with high and low temperature resistance and high corrosion resistance, comprising an electrical box body, a rotating rod rotatably connected to the outside of the electrical box body, sealing doors connected to both ends of the rotating rod, a sealing frame connected to one side of the electrical box body on the sealing door, a side frame connected to the side of the electrical box body, a large gear rotatably connected to the inside of the side frame body via a rotating shaft, and the rotating shaft of the large gear being connected to the rotating rod via a transmission wheel set, a small gear meshing with the large gear, a threaded screw rotatably connected to the inside of the side frame body, and the small gear sleeved on both ends of the threaded screw, a lifting block threadedly connected to the threaded screw, an adjusting screw rotatably connected to the inside of the lifting block, a wire harness block threadedly connected to the adjusting screw, and the wire harness block being slidably connected to the lifting block; An inflation component is disposed inside the side frame and below the lifting block.

[0007] Preferably, the inflation assembly includes an inflation sealing gasket disposed in the groove of the sealing frame, an inflation frame connected to the inner side of the side frame, a first piston rod slidably connected to the inflation frame, a spring connected above the piston plate of the first piston rod, and the other end of the spring connected to the inner wall of the inflation frame, an air suction frame also connected to the inner side of the side frame, a second piston rod slidably connected to the air suction frame, and the second piston rod body slidably connected to the side frame, a limit plate connected to the side of the inflation frame, and the limit plate having a guide groove, a transmission plate slidably connected to the lifting block on one side of the limit plate, and a one-way rotating roller connected to one end of the transmission plate, and the one-way rotating roller being located in the guide groove of the limit plate, the air outlet of the inflation frame being connected to the inflation sealing gasket through an air pipe, and the air inlet of the air suction frame being connected to the inflation sealing gasket through an air pipe.

[0008] Preferably, a partition is connected to the inner side of the side frame, and the partition is rotatably connected to the threaded screw.

[0009] Preferably, there are two sets of wire harness blocks, and the inner holes of both sets of wire harness blocks are curved, and rubber pads are provided at the curved surfaces.

[0010] Preferably, the inner wall of the electrical box body is provided with a sliding groove, and a sliding protrusion is provided on the inner side of the sliding groove, and the sliding protrusion is slidably connected to the lifting block.

[0011] Preferably, the side frame is connected to a protective frame, and the protective frame is provided with a snap-lock door, and the second piston rod pull plate is located in the protective frame.

[0012] Preferably, the side frame has two sets of air holes. The air inlet of the inflation frame is connected to one set of air holes through an air pipe, and the air outlet of the suction frame is connected to the other set of air holes through an air pipe. Both the air inlet and outlet of the inflation frame and the suction frame are equipped with one-way valves.

[0013] Preferably, the transmission plate is slidably connected to a guide rod, and the guide rod is connected to the lifting block.

[0014] Preferably, the method includes the following steps: S1: Pass the connecting wires through the hole in the center of the cable bundle. After the connection is complete, rotate the adjusting screw. The rotation of the adjusting screw will cause the cable bundle to move vertically. The position of the cable bundle can be adjusted according to the actual connection of the wires. S2: Rotate the sealing door to fit against the main body of the electrical box. The rotation of the sealing door will drive the small gear to rotate multiple times. The rotation of the small gear will drive the lifting block to move downward. The downward movement of the lifting block will drive the wire harness block to move downward. The downward movement of the wire harness block will pull the wires downward. The downward movement of the wire harness block will pull the wires to fit against the inner wall of the electrical box and bend them. S3: The lifting block moves downward, causing the transmission plate to move downward. During the downward movement of the transmission plate, it will come into contact with the pull plate of the first piston rod and push the first piston rod to move downward. The downward movement of the first piston rod allows outside air to enter the inner side of the inflation frame. The downward movement of the first piston rod will also cause the spring to compress and deform. S4: When the transmission plate moves downward, it will be affected by the limiting groove to move horizontally. The horizontal movement of the transmission plate separates from the pull plate of the first piston rod. The spring will restore its deformation and push the first piston rod to move upward. The upward movement of the first piston rod will gradually input the air inside the inflation frame into the inside of the inflation sealing pad through the air pipe. After the inflation sealing pad is inflated, it will fit against the inside of the sealing door. S5: When the sealing door needs to be opened, pull the second piston rod. The movement of the second piston rod draws the air inside the inflatable sealing pad into the air intake frame, making the fit between the inflatable sealing pad and the sealing door less. Rotate the sealing door in the opposite direction. The reverse rotation of the sealing door will drive the lifting block to move upward. The upward movement of the lifting block will drive the wire harness block to move upward. The upward movement of the wire harness block will pull the wire upward. S6: During the upward movement of the lifting block, the transmission plate will also move upward. During the upward movement of the transmission plate, it will also move horizontally due to the limiting groove of the limiting plate, and move back to above the first piston rod pull plate, which will facilitate the subsequent sealing door closing operation.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, when the sealing door rotates to close, it drives the wire harness block to move. The movement of the wire harness block pulls the wires to move, thereby binding and adjusting the wires so that they bend and fit against the inner wall of the electrical box body, preventing the wires from touching the electrical appliances inside the electrical box body. When the sealing door rotates to open, it drives the wire harness block to move upward, gradually reducing the degree of restriction on the wires and preventing the wires from obstructing the opening of the sealing door. Furthermore, the initial position of the wire harness block can be adjusted by rotating the adjusting screw, making it convenient for staff to adjust according to the wire connection.

[0016] 2. In this invention, during the rotation of the sealing door, the lifting block will also move vertically. The downward movement of the lifting block will drive the transmission plate to move downward. The downward movement of the transmission plate can complete the inflation operation of the inflatable sealing gasket, thereby reducing the wear of the inflatable sealing gasket during use. After inflation, the inflatable sealing gasket can better fit the sealing door, resulting in a good sealing effect. Moreover, the inflation of the inflatable sealing gasket can be released by pulling the second piston rod, which is convenient and quick. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the outer structure of the main body of the electrical box of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the top surface structure of the electrical box of the present invention; Figure 5 This is a schematic diagram of the inner structure of the electrical box body of the present invention; Figure 6 This is a schematic diagram of the inflatable component structure of the present invention; Figure 7 This is a schematic diagram of the lifting block and transmission plate structure of the present invention; Figure 8 This is a schematic diagram of the inner structure of the sealing door of the present invention; Figure 9 This is a schematic diagram of the external structure of the present invention.

[0018] In the diagram: 1. Electrical box body; 2. Rotating rod; 3. Sealing door; 4. Sealing frame; 5. Side frame; 6. Large gear; 7. Small gear; 8. Threaded screw; 9. Partition plate; 10. Lifting block; 11. Adjusting screw; 12. Cable harness block; 13. Inflation assembly; 131. Inflation sealing gasket; 132. Inflation frame; 133. First piston rod; 134. Spring; 135. Suction frame; 136. Second piston rod; 137. Limiting plate; 138. Transmission plate. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0020] Please see Figure 1 - Figure 9This invention provides a technical solution: a Class IIIC explosion-proof power distribution device resistant to high and low temperatures and corrosion, made entirely of plastic, comprising a main body 1, a rotating rod 2 rotatably connected to the outside of the main body 1, sealing doors 3 connected to both ends of the rotating rod 2, a sealing frame 4 connected to one side of the main body 1 near the sealing door 3, a side frame 5 connected to the side of the main body 1, a large gear 6 rotatably connected to the inside of the side frame 5 via a rotating shaft, and the rotating shaft of the large gear 6 being connected to the rotating rod 2 via a transmission wheel set, the large gear 6 meshing with a small gear 7, a threaded screw 8 rotatably connected to the inside of the side frame 5, and the small gear 7 sleeved on both ends of the threaded screw 8, a lifting block 10 threadedly connected to the threaded screw 8, and a lifting block 10 rotatably connected to the inside of the lifting block 10. Adjusting screw 11 is threadedly connected to wire harness block 12, which is slidably connected to lifting block 10. When sealing door 3 is rotated to close, it will drive wire harness block 12 to move. The movement of wire harness block 12 pulls the wire to move. The wire harness block 12 binds and adjusts the wire, so that the wire bends and fits against the inner wall of electrical box body 1, preventing the wire from touching the electrical appliances inside electrical box body 1. When sealing door 3 is rotated to open, it will drive wire harness block 12 to move upward and gradually reduce the degree of restriction on the wire, preventing the wire from obstructing the opening of sealing door 3. The initial position of wire harness block 12 can be adjusted by rotating adjusting screw 11, which is convenient for staff to adjust according to the wire connection. Inflatable component 13 is located inside the side frame 5 and below the lifting block 10.

[0021] In one embodiment of the present invention, the inflation assembly 13 includes an inflation sealing gasket 131 disposed in the groove of the sealing frame 4, an inflation frame 132 connected to the inner side of the side frame 5, a first piston rod 133 slidably connected to the inflation frame 132, a spring 134 connected above the piston plate of the first piston rod 133, and the other end of the spring 134 connected to the inner wall of the inflation frame 132, an air suction frame 135 also connected to the inner side of the side frame 5, a second piston rod 136 slidably connected to the air suction frame 135, and the rod body of the second piston rod 136 slidably connected to the side frame 5, a limit plate 137 connected to the side of the inflation frame 132, and the limit plate 137 having a guide groove, a transmission plate 138 slidably connected to the lifting block 10 located on one side of the limit plate 137, and the transmission plate 138... The end is connected to a one-way rotating roller, which is located in the guide groove of the limiting plate 137. The air outlet of the inflation frame 132 is connected to the inflation sealing pad 131 through an air pipe, and the air inlet of the suction frame 135 is connected to the inflation sealing pad 131 through an air pipe. During the rotation of the sealing door 3, the lifting block 10 will also move vertically. The downward movement of the lifting block 10 will drive the transmission plate 138 to move downward. The downward movement of the transmission plate 138 can complete the inflation operation of the inflation sealing pad 131, thereby reducing the wear of the inflation sealing pad 131 during use. After inflation, the inflation sealing pad 131 can better fit the sealing door 3, resulting in a good sealing effect. The inflation of the inflation sealing pad 131 can be released by pulling the second piston rod 136, which is convenient and quick. As one embodiment of the present invention, a partition plate 9 is connected to the inner side of the side frame 5, and the partition plate 9 is rotatably connected to the threaded screw 8. By setting the partition plate 9 to limit the position of the middle section of the threaded screw 8, the stability of the threaded screw 8 during rotation is improved. As one embodiment of the present invention, two sets of wire harness blocks 12 are provided, and the inner holes of both sets of wire harness blocks 12 are curved, and rubber pads are provided at the curved surfaces. By providing rubber pads at the curved surfaces, the wear on the wires when the wire harness blocks 12 push or pulls the wires is reduced. As one embodiment of the present invention, a sliding groove is provided on the inner wall of the electrical box body 1, and a sliding protrusion is provided on the inner side of the sliding groove. The sliding protrusion is slidably connected to the lifting block 10. By providing the sliding protrusion and the lifting block 10 for limiting, the stability of the lifting block 10 during vertical movement is improved. As one embodiment of the present invention, a protective frame is connected to the side of the side frame 5, and the protective frame is provided with a snap-on door. The pull plate of the second piston rod 136 is located in the protective frame. The second piston rod 136 is protected by the protective frame to avoid external collisions affecting the second piston rod 136. In one embodiment of the present invention, the side frame 5 is provided with two sets of air holes. The air inlet of the inflation frame 132 is connected to one set of air holes through an air pipe, and the air outlet of the suction frame 135 is connected to the other set of air holes through an air pipe. Both the air inlet and outlet of the inflation frame 132 and the suction frame 135 are provided with one-way valves. By providing one-way valves, the inflation and deflation operations of the inflation sealing gasket 131 can be realized. In one embodiment of the present invention, a guide rod is slidably connected to the transmission plate 138, and the guide rod is connected to the lifting block 10. By setting the guide rod, the transmission plate 138 is limited, thereby improving the stability of the transmission plate 138 during horizontal movement.

[0022] The method provided in this embodiment is described below, and specifically includes the following steps: S1: Pass the connected wires through the hole in the center of the cable tie block 12. After the connection is completed, rotate the adjusting screw 11. The rotation of the adjusting screw 11 will drive the cable tie block 12 to move vertically. The position of the cable tie block 12 can be adjusted according to the actual connection of the wires. S2: Rotate the sealing door 3 to make it fit against the electrical box body 1. The rotation of the sealing door 3 will drive the small gear 7 to rotate multiple times. The rotation of the small gear 7 will drive the lifting block 10 to move downward. The downward movement of the lifting block 10 will drive the wire harness block 12 to move downward. The downward movement of the wire harness block 12 will pull the wire downward. The downward movement of the wire harness block 12 will pull the wire to fit against the inner wall of the electrical box body 1 and bend it. S3: The lifting block 10 moves downward, causing the transmission plate 138 to move downward. During the downward movement of the transmission plate 138, it will come into contact with the pull plate of the first piston rod 133 and push the first piston rod 133 to move downward. The downward movement of the first piston rod 133 allows outside air to enter the inside of the inflation frame 132. The downward movement of the first piston rod 133 will also cause the spring 134 to be compressed and deformed. S4: When the transmission plate 138 moves downward, it will move horizontally due to the influence of the limiting groove. When the transmission plate 138 moves horizontally, it will separate from the pull plate of the first piston rod 133. The spring 134 will restore its deformation and push the first piston rod 133 to move upward. When the first piston rod 133 moves upward, it will gradually input the air inside the inflation frame 132 into the inside of the inflation sealing pad 131 through the air pipe. After the inflation sealing pad 131 is inflated, it will fit against the inside of the sealing door 3. S5: When it is necessary to open the sealing door 3, pull the second piston rod 136. The movement of the second piston rod 136 draws the air inside the inflatable sealing pad 131 into the air intake frame 135, making the fit between the inflatable sealing pad 131 and the sealing door 3 less. Rotate the sealing door 3 in the opposite direction. The reverse rotation of the sealing door 3 will drive the lifting block 10 to move upward. The upward movement of the lifting block 10 will drive the wire harness block 12 to move upward. The upward movement of the wire harness block 12 will pull the wire upward. S6: During the upward movement of the lifting block 10, the transmission plate 138 will be driven to move upward. During the upward movement of the transmission plate 138, it will also be affected by the limiting groove of the limiting plate 137 to move horizontally and move back to the top of the first piston rod 133 pull plate, which will facilitate the subsequent closing operation of the sealing door 3.

[0023] Working principle: First, during the wiring process between the instrument on the surface of the sealing door 3 and the electrical appliances inside the electrical box body 1, the connected wires need to be passed through the hole in the center of the wire harness block 12. After the connection is completed, rotate the adjusting screw 11. Since the adjusting screw 11 is threadedly connected to the wire harness block 12 and the wire harness block 12 is slidably connected to the lifting block 10, the rotation of the adjusting screw 11 will drive the wire harness block 12 to move vertically. Thus, the position of the wire harness block 12 can be adjusted according to the actual connection of the wires. Secondly, when the sealing door 3 is closed, rotate the sealing door 3 to make it fit against the electrical box body 1. During the rotation of the sealing door 3, the rotating rod 2 will rotate. Since the rotating rod 2 is connected to the shaft of the large gear 6 through the transmission wheel set, the rotation of the rotating rod 2 will drive the large gear 6 to rotate synchronously. Since the large gear 6 is meshed with the small gear 7, and the diameter of the large gear 6 is larger than the diameter of the small gear 7, the large gear 6 will rotate at a large angle and drive the small gear 7 to rotate multiple times. The rotation of the small gear 7 will drive the threaded screw 8 to rotate. Since the threaded screw 8 is threadedly connected to the lifting block 10, and the lifting block 10 is slidably connected to the electrical box body 1, the rotation of the threaded screw 8 will drive the lifting block 10 to move downward. The downward movement of the lifting block 10 will drive the wire harness block 12 to move downward. The downward movement of the wire harness block 12 will pull the wire downward. The downward movement of the wire harness block 12 will pull the wire to fit against the inner wall of the electrical box body 1 and bend it, thereby preventing the wire from fitting against the electrical appliances inside the electrical box body 1. Then, during the downward movement of the lifting block 10, it will also drive the transmission plate 138 to move downward. During the downward movement of the transmission plate 138, it will come into contact with the pull plate of the first piston rod 133 and push the first piston rod 133 to move downward. The downward movement of the first piston rod 133 allows outside air to enter the inner side of the inflation frame 132. During the downward movement of the first piston rod 133, it will also cause the spring 134 to compress and deform. Since the rotating roller on one side of the transmission plate 138 is located in the inclined groove of the limiting plate 137, and the transmission plate 138 is slidably connected to the lifting block 10, when the transmission plate... When the transmission plate 138 moves downward to the inclined surface of the limiting groove of the limiting plate 137, the transmission plate 138 will move horizontally under the influence of the limiting groove. The horizontal movement of the transmission plate 138 separates from the pull plate of the first piston rod 133. After the transmission plate 138 separates from the first piston rod 133, the spring 134 will restore its deformation and push the first piston rod 133 to move upward. The upward movement of the first piston rod 133 will gradually input the air inside the inflation frame 132 into the inside of the inflation sealing pad 131 through the air pipe. After the inflation sealing pad 131 is inflated, it will fit against the inside of the sealing door 3, improving the overall sealing performance of the device. Finally, when it is necessary to open the sealing door 3, open the protective frame on the side of the side frame 5, and then pull the second piston rod 136. The movement of the second piston rod 136 draws the air inside the inflatable sealing gasket 131 into the air intake frame 135, making the fit between the inflatable sealing gasket 131 and the sealing door 3 less. Rotate the sealing door 3 in the opposite direction. The reverse rotation of the sealing door 3 will drive the lifting block 10 to move upward. The upward movement of the lifting block 10 will drive the wire harness block 12 to move upward. The upward movement of the wire harness block 12 will pull the wire upward, so that the wire is relaxed and avoids the wire being stretched and damaged during the opening of the sealing door 3. During the upward movement of the lifting block 10, it will drive the transmission plate 138 to move upward. During the upward movement of the transmission plate 138, it will also be affected by the limiting groove of the limiting plate 137 to move horizontally and move back to above the first piston rod 133 pulling plate, which will facilitate the subsequent closing operation of the sealing door 3.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A Class III C explosion-proof power distribution device with high and low temperature resistance, high corrosion resistance, and made entirely of plastic, comprising a main body of an electrical box, characterized in that: A rotating rod is rotatably connected to the outside of the electrical box body. Sealing doors are connected to both ends of the rotating rod. A sealing frame is connected to one side of the electrical box body on the sealing door. A side frame is connected to the side of the electrical box body. A large gear is rotatably connected to the inside of the side frame via a rotating shaft. The rotating shaft of the large gear is connected to the rotating rod via a transmission wheel set. A small gear is meshed with the large gear. A threaded screw is rotatably connected to the inside of the side frame body. The small gear is sleeved on both ends of the threaded screw. A lifting block is threadedly connected to the threaded screw. An adjusting screw is rotatably connected to the inside of the lifting block. A wire harness block is threadedly connected to the adjusting screw. The wire harness block is slidably connected to the lifting block. An inflation assembly is disposed inside the side frame and below the lifting block; The inflation assembly includes an inflation sealing gasket disposed in the groove of the sealing frame. An inflation frame is connected to the inner side of the side frame. A first piston rod is slidably connected to the inflation frame. A spring is connected above the piston plate of the first piston rod, and the other end of the spring is connected to the inner wall of the inflation frame. An air suction frame is also connected to the inner side of the side frame. A second piston rod is slidably connected to the air suction frame, and the rod body of the second piston rod is slidably connected to the side frame. A limit plate is connected to the side of the inflation frame, and the limit plate has a guide groove. A transmission plate is slidably connected to the lifting block on one side of the limit plate, and a one-way rotating roller is connected to one end of the transmission plate. The one-way rotating roller is located in the guide groove of the limit plate. The air outlet of the inflation frame is connected to the inflation sealing gasket through an air pipe, and the air inlet of the air suction frame is connected to the inflation sealing gasket through an air pipe. A partition is connected to the inner side of the side frame, and the partition is rotatably connected to the threaded screw. The side frame is connected to a protective frame, and the protective frame is equipped with a snap-lock door, and the second piston rod pull plate is located in the protective frame. The side frame has two sets of air holes. The air inlet of the inflation frame is connected to one set of air holes through an air pipe, and the air outlet of the suction frame is connected to the other set of air holes through an air pipe. Both the air inlet and outlet of the inflation frame and the suction frame are equipped with one-way valves. The transmission plate is slidably connected to a guide rod, and the guide rod is connected to the lifting block.

2. The high and low temperature resistant, high corrosion resistant, all-plastic Class IIIC explosion-proof power distribution device according to claim 1, characterized in that: There are two sets of the wire harness blocks, and the inner holes of both sets of wire harness blocks are curved, and rubber pads are provided at the curved surfaces.

3. The high and low temperature resistant, high corrosion resistant, all-plastic Class IIIC explosion-proof power distribution device according to claim 1, characterized in that: The inner wall of the electrical box body is provided with a sliding groove, and a sliding protrusion is provided on the inner side of the sliding groove, and the sliding protrusion is slidably connected to the lifting block.

4. A method of using a power distribution device, characterized in that: The method applicable to the high and low temperature resistant, high corrosion resistant, all-plastic Class IIIC explosion-proof power distribution device according to any one of claims 1-3 includes the following steps: S1: Pass the connecting wires through the hole in the center of the cable bundle. After the connection is complete, rotate the adjusting screw. The rotation of the adjusting screw will cause the cable bundle to move vertically. The position of the cable bundle can be adjusted according to the actual connection of the wires. S2: Rotate the sealing door to fit against the main body of the electrical box. The rotation of the sealing door will drive the small gear to rotate multiple times. The rotation of the small gear will drive the lifting block to move downward. The downward movement of the lifting block will drive the wire harness block to move downward. The downward movement of the wire harness block will pull the wires downward. The downward movement of the wire harness block will pull the wires to fit against the inner wall of the electrical box and bend them. S3: The lifting block moves downward, causing the transmission plate to move downward. During the downward movement of the transmission plate, it will come into contact with the pull plate of the first piston rod and push the first piston rod to move downward. The downward movement of the first piston rod allows outside air to enter the inner side of the inflation frame. The downward movement of the first piston rod will also cause the spring to compress and deform. S4: When the transmission plate moves downward, it will be affected by the limiting groove to move horizontally. The horizontal movement of the transmission plate separates from the pull plate of the first piston rod. The spring will restore its deformation and push the first piston rod to move upward. The upward movement of the first piston rod will gradually input the air inside the inflation frame into the inside of the inflation sealing pad through the air pipe. After the inflation sealing pad is inflated, it will fit against the inside of the sealing door. S5: When the sealing door needs to be opened, pull the second piston rod. The movement of the second piston rod draws the air inside the inflatable sealing pad into the air intake frame, making the fit between the inflatable sealing pad and the sealing door less. Rotate the sealing door in the opposite direction. The reverse rotation of the sealing door will drive the lifting block to move upward. The upward movement of the lifting block will drive the wire harness block to move upward. The upward movement of the wire harness block will pull the wire upward. S6: During the upward movement of the lifting block, the transmission plate will also move upward. During the upward movement of the transmission plate, it will also move horizontally due to the limiting groove of the limiting plate, and move back to above the first piston rod pull plate, which will facilitate the subsequent sealing door closing operation.

Images