Vacuum gate valve

Abstract

The invention relates to the technical field of gate valves, and discloses a vacuum gate valve which comprises a valve body, a fixing frame, a supporting frame, a valve plate, an opening assembly and a driving mechanism. The fixing frame is arranged in the valve body, the supporting frame is movably connected into the fixing frame, and the valve plates are connected to the two sides of the fixing frame through elastic pieces. The opening assemblies are fixed to the two sides of the supporting frame and make contact with the valve plates, the valve plates are provided with first positions and second positions which are distributed up and down, the distance L1 between the two opposite first positions is larger than the distance L2 between the two opposite second positions, and when the supporting frame moves downwards, the opening assemblies move to the second positions from the first positions to gradually open the two valve plates; when the supporting frame moves upwards, the opening assembly returns to the first position from the second position, the valve plate retracts under the action of the elastic piece, and when the opening assembly is located at the second position, the supporting frame can drive the fixing frame to move upwards together. The structure is simple, and the valve body is convenient to open and close.

Description

Technical Field

[0001] This application relates to the field of slide gate valve technology, specifically a vacuum slide gate valve. Background Technology

[0002] In the use of vacuum slide gate valves, the valves are frequently opened and closed. However, the existing vacuum slide gate valves have relatively complex structural designs and are also relatively complicated to operate. Under working conditions that require frequent opening and closing of the vacuum slide gate valves, it is not convenient for operators to operate. Therefore, there is an urgent need for a vacuum slide gate valve with a simple structure and easy operation.

[0003] Application content

[0004] To address the aforementioned technical problems, this application provides a vacuum slide gate valve. The valve body can be closed by expanding the valve plate and opened by retracting the valve plate. During the downward movement of the support frame driven by the drive mechanism, as the expanding component moves from the second position to the first position, the valve plates on both sides of the fixed frame gradually expand under the action of the expanding component. During the upward movement of the support frame driven by the drive mechanism, as the expanding component moves from the first position to the second position, the valve plates on both sides of the fixed frame gradually retract under the action of the elastic element, thereby realizing the opening and closing of the valve. The structure is simple, and the operation of opening and closing the valve body can be achieved simply by driving the support frame through the drive mechanism, thus improving ease of use.

[0005] The technical solution of this application is:

[0006] A vacuum slide gate valve includes a valve body, a fixed frame, a support frame, a valve plate, and a spreading assembly. The fixed frame is located inside the valve body, and the support frame is movably connected inside the fixed frame. The valve body is provided with a drive mechanism for driving the support frame to move up or down. The valve plate is connected to both sides of the fixed frame by elastic elements, and the spreading assembly is fixedly connected to both sides of the support frame. The valve plate has a first position and a second position, with the first position located above the second position. The spreading assembly contacts the valve plate and can move between the first position and the second position. The distance between the two valve plates at their opposite first positions is L1, and the distance between the two valve plates at their opposite second positions is L2, and L1 is greater than L2.

[0007] When the support frame moves downwards, the spreading assembly moves from the first position to the second position, and the spreading assembly gradually spreads the two valve plates apart; when the support frame moves upwards, the spreading assembly moves from the second position to the first position, and the two valve plates gradually retract under the action of the elastic element; when the spreading assembly is in the second position, the support frame can drive the fixed frame to move upwards.

[0008] Preferably, the valve plate is provided with an arc-shaped groove and a limiting groove on the side near the support frame. The limiting groove is designed to be inclined, and the extension direction of the limiting groove is inclined inward towards the thickness direction of the valve plate. The arc-shaped groove is connected to the limiting groove, and the inward inclined end of the arc-shaped groove and the limiting groove are connected. The opening component contacts the inner wall of the limiting groove or the inner wall of the arc-shaped groove. The arc-shaped groove is the second position, and the limiting groove is the first position.

[0009] Preferably, the mounting frame is provided with a mounting groove and a mounting hole for the mounting block to pass through. The mounting groove and the mounting hole are connected. The mounting groove is located on the side of the mounting frame away from the valve plate. The valve plate is provided with a mounting block on the side close to the mounting frame. The mounting block is provided with an elastic retaining ring and a limiting plate. The limiting plate is sleeved on the outer peripheral wall of the mounting block. The elastic retaining ring is fixed on the outer peripheral wall of the mounting block and is located on the side of the limiting plate away from the valve plate. The limiting plate is in limiting fit with the end wall of the mounting groove. One end of the elastic element is fixedly connected to one side of the limiting plate, and the other end is fixedly connected to the side of the elastic retaining ring close to the limiting plate. The valve plate is provided with a sealing groove for installing a sealing ring on the inner wall side close to the valve body.

[0010] Preferably, the mounting block has a groove located on the outer peripheral wall of the mounting block, and an elastic retaining ring is fitted on the mounting block and located inside the groove.

[0011] Preferably, the support frame is provided with support blocks, which are distributed on both sides of the support frame. The opening component includes a connecting shaft and a limiting wheel. The support block is provided with a positioning groove. The connecting shaft passes through the positioning groove and is fixedly connected to the support block. The limiting wheel is sleeved on the connecting shaft and located in the positioning groove. The outer peripheral wall of the limiting wheel protrudes from the support block and contacts the valve plate.

[0012] Preferably, the outer peripheral wall of the support frame is provided with a first shaft arranged horizontally along its width direction and a second shaft arranged horizontally along its length direction. The first shaft is provided with a rotatable first guide wheel and the second shaft is provided with a rotatable second guide wheel. The support frame makes rolling contact with the inner wall of the valve body through the first guide wheel and the second guide wheel.

[0013] Preferably, the bottom of the fixing frame is provided with a third shaft arranged horizontally along its length, and the third shaft is provided with a rotatable positioning wheel, the outer peripheral wall of the positioning wheel protruding from the bottom of the fixing frame.

[0014] Preferably, the fixing frame includes symmetrically arranged fixing plates, each fixing plate having multiple positioning holes. Two fixing plates are connected and fixed by bolts passing through the positioning holes. Each fixing plate has a strip groove. When the two fixing plates are connected by bolts, the inner wall of the strip groove is matched with the outer wall of the support block. The support frame is located between the two fixing plates. Each fixing plate has an installation groove and an installation hole.

[0015] Preferably, the driving mechanism includes a fixed column, a connecting column, and a transmission rod assembly. The fixed column is fixedly connected to the top of the valve body. The connecting column and the fixed column are rotatably connected by a bearing. The connecting column and the fixed column are screwed together. A connecting rod is provided on the connecting column. One end of the connecting rod is located inside the valve body. The end of the connecting rod inside the valve body is hinged to one end of the transmission rod assembly. The other end of the transmission rod assembly is hinged to the support frame. The connecting column can rotate relative to the fixed column to move up or down to drive the connecting rod to move up or down, and drive the transmission rod assembly to drive the support frame to move up or down.

[0016] Preferably, the transmission rod assembly includes a first plate, a second plate, and a third plate. One end of the first plate is hinged to the connecting rod, and the other end is hinged to the second plate. One end of the second plate is hinged to the top of the valve body, and the other end is hinged to one end of the third plate. The other end of the third plate is hinged to the top of the support frame.

[0017] One of the above-mentioned technical solutions in this application has at least one of the following advantages or beneficial effects:

[0018] This application allows the valve body to be closed by expanding the valve plate and opened by retracting the valve plate. During the downward movement of the support frame via the drive mechanism, as the expanding component moves from the second position to the first position, the valve plates on both sides of the fixed frame gradually expand under the action of the expanding component. During the upward movement of the support frame via the drive mechanism, as the expanding component moves from the first position to the second position, the valve plates on both sides of the fixed frame gradually retract under the action of the elastic element, thereby realizing the opening and closing of the valve. The structure is simple, and the operation of opening and closing the valve body can be achieved simply by driving the support frame via the drive mechanism, thus improving ease of use. Attached Figure Description

[0019] Figure 1 This is a perspective view of Embodiment 1 of this application;

[0020] Figure 2 This is a side view of Embodiment 1 of this application;

[0021] Figure 3 This is a cross-sectional view of Embodiment 1 of this application;

[0022] Figure 4 This is a schematic diagram of the structure of this application without a valve body and drive mechanism;

[0023] Figure 5 for Figure 4 The front view;

[0024] Figure 6 for Figure 5 AA section view;

[0025] Figure 7 for Figure 5 BB cross-sectional view;

[0026] Figure 8 This is a schematic diagram of the support frame structure;

[0027] Figure 9 for Figure 4 A schematic diagram showing the structure after disassembling the single-sided valve plate;

[0028] Figure 10 This is a schematic diagram of the valve plate.

[0029] The reference numerals for each of the attached figures are as follows:

[0030] 1. Valve body;

[0031] 2. Drive mechanism; 21. Fixed column; 22. Connecting column; 221. Connecting rod; 23. Transmission rod assembly; 231. First plate; 232. Second plate; 233. Third plate;

[0032] 3. Support frame; 31. Support block; 32. Positioning groove; 33. First shaft; 331. First guide wheel; 34. Second shaft; 341. Second guide wheel;

[0033] 4. Fixing bracket; 41. Mounting slot; 42. Mounting hole; 43. Third shaft; 44. Fixing plate; 45. Positioning hole; 46. Strip groove; 47. Positioning wheel;

[0034] 5. Valve plate; 51. Arc groove; 52. Limiting groove; 53. Mounting block; 531. Elastic retaining ring; 532. Limiting plate; 533. Groove; 54. Sealing groove;

[0035] 6. Spreading assembly; 61. Connecting shaft; 62. Limiting wheel;

[0036] 7. Elastic components. Detailed Implementation

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

[0038] Example 1

[0039] Please see Figures 1-10A vacuum slide gate valve includes a valve body 1, a fixed frame 4, a support frame 3, a valve plate 5, and a spreading assembly 6. The fixed frame 4 is located inside the valve body 1, and the support frame 3 is movably connected inside the fixed frame 4. The valve body 1 is provided with a drive mechanism 2 for driving the support frame 3 to move up or down. The valve plate 5 is connected to both sides of the fixed frame 4 by elastic elements 7. The spreading assembly 6 is fixedly connected to both sides of the support frame 3. The valve plate 5 has a first position and a second position, with the first position located above the second position. The spreading assembly 6 contacts the valve plate 5 and can move up or down in the first and second positions. When the positions move, the distance between the first positions of the two valve plates 5 relative to each other is L1, and the distance between the second positions of the two valve plates 5 relative to each other is L2, and L1 is greater than L2; when the support frame 3 moves downward and the spreading assembly 6 moves from the first position to the second position, the spreading assembly 6 gradually spreads the two valve plates 5 apart; when the support frame 3 moves upward and the spreading assembly 6 moves from the second position to the first position, the two valve plates 5 gradually retract under the action of the elastic element 7; when the spreading assembly 6 is in the second position, the support frame 3 can drive the fixed frame 4 to move upward.

[0040] It should be noted that vacuum slide gate valves need to be opened and closed frequently during use.

[0041] In practical applications, the valve body 1 is provided with a channel. When the two valve plates 5 are opened to close the two ends of the channel, the valve body 1 is closed. When the two valve plates 5 are retracted, they move away from the two ends of the channel, opening the valve body 1 to connect the channel, thus realizing the opening and closing of the vacuum slide valve. During operation, the operator can drive the support frame 3 to move up or down along the height direction of the valve body 1 by controlling the drive mechanism 2. The support frame 3 can move up or down within the fixed frame 4. For ease of explanation, the initial state is assumed to be that the opening component 6 is in the first position, and the fixed frame 4 and the support frame 3 are at the top of the valve body 1. When the operator controls the drive mechanism 2 to drive the support frame 3 down, the fixed frame 4 will move down together with the support frame 3 within the valve body 1 until the fixed frame 4 touches the bottom of the valve body 1 first. Then, the drive mechanism 2 will drive the support frame 3 to move up and down in the fixed position, thereby driving the opening component 6 down from the first position to the second position. The distance L1 between the first position and the distance L2 between the two second positions are such that L1 is greater than L2. Therefore, the spreading component 6 will gradually spread the two valve plates 5. The two valve plates 5 will approach the openings at both ends of the channel of the valve body 1, thereby closing the vacuum slide valve. In this closed state, the operator can control the drive mechanism 2 to drive the support frame 3 upward. At the beginning of the upward movement, the support frame 3 will move upward within the fixed frame 4, thereby driving the spreading component 6 from the second position to the first position. Under the action of the elastic element 7, the two valve plates 5 will retract and move away from the openings at both ends of the channel of the valve body 1, thereby opening the vacuum slide valve. Until the spreading component 6 is completely in the first position, the support frame 3 will drive the fixed frame 4 upward together to the top of the valve body 1, returning to the initial state. In this embodiment, the elastic element 7 is a wave spring, but it can also be set as other elastic components, which will not be elaborated here. The simple structure makes it convenient for the operator to operate.

[0042] Preferably, the valve plate 5 is provided with an arc-shaped groove 51 and a limiting groove 52 on the side near the support frame 3. The limiting groove 52 is designed to be inclined, and the extension direction of the limiting groove 52 is inclined inward towards the thickness direction of the valve plate 5. The arc-shaped groove 51 is connected to the limiting groove 52, and the inwardly inclined ends of the arc-shaped groove 51 and the limiting groove 52 are connected. The spreading component 6 is in contact with the inner wall of the limiting groove 52 or the inner wall of the arc-shaped groove 51. The arc-shaped groove 51 is the first position, and the limiting groove 52 is the second position.

[0043] In this embodiment, the arc-shaped groove 51 is the first position, and the limiting groove 52 is the second position. The arc-shaped groove 51 is located above the limiting groove 52, and the limiting groove 52 and the arc-shaped groove 51 are connected. Therefore, the spreading component 6 can move between the limiting groove 52 and the arc-shaped groove 51. Specifically, the arc-shaped groove 51 is deeper. So when the spreading component 6 is located in the arc-shaped groove 51, the two valve plates 5 retract under the action of the elastic member 7, thereby opening the vacuum slide valve. When the spreading component 6 is located in the limiting groove 52, the spreading component 6 will spread the two valve plates 5 apart, thereby closing the vacuum slide valve. On the other hand, the arc-shaped groove 51 can also prevent the spreading component 6 from disengaging from the limiting part. And when the spreading component 6 is located in the arc-shaped groove 51, the support frame 3 can drive the fixed frame 4 to move upward synchronously, which is beneficial to increase the opening degree of the slide valve to the maximum.

[0044] Preferably, the fixing frame 4 is provided with a mounting groove 41 and a mounting hole 42 for the mounting block 53 to pass through. The mounting groove 41 and the mounting hole 42 are connected. The mounting groove 41 is located on the side of the fixing frame 4 away from the valve plate 5. The valve plate 5 is provided with a mounting block 53 on the side close to the fixing frame 4. The mounting block 53 is provided with an elastic retaining ring 531 and a limiting plate 532. The limiting plate 532 is sleeved on the outer peripheral wall of the mounting block 53. The elastic retaining ring 531 is fixed on the outer peripheral wall of the mounting block 53 and is located on the side of the limiting plate 532 away from the valve plate 5. The limiting plate 532 is limited and matched with the end wall of the mounting groove 41. One end of the elastic element 7 is fixedly connected to one side of the limiting plate 532, and the other end is fixedly connected to the side of the elastic retaining ring 531 close to the limiting plate 532. The valve plate 5 is provided with a sealing groove 54 for installing a sealing ring on the side of the inner wall close to the valve body 1.

[0045] During installation, the valve plate 5 passes through the mounting hole 42 via the mounting block 53 and is located within the mounting groove 41. Specifically, in this embodiment, the elastic element 7 is a flat-ended wave spring, a type of wave spring with flat ends. The elastic element 7 is sleeved on the outer peripheral wall of the mounting block 53 and fixed by an elastic retaining ring 531. The elastic retaining ring 531 is located within the mounting groove 41, and a limiting plate 532 prevents the elastic retaining ring 531 from dislodging from the mounting groove 41, thus clamping the elastic element 7 between the fixing frame 4 and the valve plate 5. Specifically, in the initial state, the elastic element 7 is in the first position with the spreading component 6 in the first position. When the spreading component 6 begins to move to the second position... During movement, the elastic element 7 is gradually stretched. When the spreading component 6 moves from the second position to the first position, the elastic element 7 gradually returns to its initial state. Therefore, under the action of the spreading component 6, the limiting part, and the elastic element 7, the valve plate 5 can open or close the vacuum slide gate valve. On the other hand, installing a sealing ring through the sealing groove 54 can improve the sealing performance of the slide gate valve. In this embodiment, only one side of the two valve plates 5 is provided with a sealing groove 54, and the other valve plate 5 without a sealing groove 54 mainly plays a supporting role. However, it can also be set so that both valve plates 5 are provided with sealing grooves 54, and sealing rings need to be installed on the sealing grooves 54 to improve the sealing performance.

[0046] Preferably, the mounting block 53 is provided with a groove 533, which is located on the outer peripheral wall of the mounting block 53, and the elastic retaining ring 531 is sleeved on the mounting block 53 and located in the groove 533.

[0047] In this embodiment, the elastic retaining ring 531 can be fitted into the groove 533, thereby limiting the elastic retaining ring 531 and preventing it from detaching from the mounting block 53. Furthermore, one end of the elastic member 7 is fixed to the mounting block 53, which means that the fixing frame 4 and the valve plate 5 can be subjected to the elastic force of the elastic member 7. When the opening component 6 is in the first position, it can move away from the inner wall of the valve body 1, thereby opening the passage of the valve body 1.

[0048] Preferably, the support frame 3 is provided with a support block 31, which is distributed on both sides of the support frame 3. The expansion assembly 6 includes a connecting shaft 61 and a limiting wheel 62. The support block 31 is provided with a positioning groove 32. The connecting shaft 61 passes through the positioning groove 32 and is fixedly connected to the support block 31. The limiting wheel 62 is sleeved on the connecting shaft 61 and located in the positioning groove 32. The outer peripheral wall of the limiting wheel 62 protrudes from the support block 31 and contacts the valve plate 5.

[0049] In this embodiment, the limiting wheel 62 is sleeved on the connecting shaft 61. The limiting wheel 62 can rotate around the axis of the connecting shaft 61, and thus can roll in the arc groove 51 or the limiting groove 52. This allows the valve body 1 to open and close through rolling friction, thereby avoiding the influence of sliding friction on the slide gate valve. When the slide gate valve is frequently opened or closed, sliding friction can easily age and wear parts, and may generate small particles, causing jamming and affecting stability. It can also shorten the service life of the vacuum slide gate valve. Therefore, the service life of the vacuum slide gate valve can be improved by using the rolling contact method of the limiting wheel 62 to open the valve plate 5.

[0050] Preferably, the outer peripheral wall of the support frame 3 is provided with a first shaft 33 arranged horizontally along its width direction and a second shaft 34 arranged horizontally along its length direction. The first shaft 33 is provided with a rotatable first guide wheel 331, and the second shaft 34 is provided with a rotatable second guide wheel 341. The support frame 3 rolls in contact with the inner wall of the valve body 1 through the first guide wheel 331 and the second guide wheel 341.

[0051] Through the above design, the first guide wheel 331 can rotate around the axis of the first shaft 33, and the second guide wheel 341 can rotate around the axis of the second shaft 34. In this embodiment, the first guide wheel 331 and the inner walls of both ends of the valve body 1 along the length direction of the valve body 1 roll into contact, and the second guide wheel 341 and the inner walls of both ends of the valve body 1 along the width direction of the valve body 1 roll into contact. This makes it easier for the support frame 3 to move up or down in the valve body 1 under the driving action of the drive mechanism 2, with less resistance and easier movement up or down in the valve body 1.

[0052] Preferably, the bottom of the fixing frame 4 is provided with a third shaft 43 arranged horizontally along its length, and the third shaft 43 is provided with a rotatable positioning wheel 47, the outer peripheral wall of the positioning wheel 47 protruding from the bottom of the fixing frame 4.

[0053] In this embodiment, the positioning wheel 47 can rotate around the axis of the third shaft 43. The positioning wheel 47 can prevent the fixed frame 4 and the bottom wall of the valve body 1 from sliding friction when the valve plate 5 moves closer or further away from the inner wall of the valve body 1, thereby avoiding the generation of extremely fine particles and wear.

[0054] Preferably, the fixing frame 4 includes symmetrically arranged fixing plates 44. The fixing plates 44 are provided with a plurality of positioning holes 45. Two fixing plates 44 are connected and fixed by bolts passing through the positioning holes 45. Each fixing plate 44 is provided with a strip groove 46. When the two fixing plates 44 are connected by bolts, the inner wall of the strip groove 46 is matched with the outer wall of the support block 31. The support frame 3 is located between the two fixing plates 44. Each fixing plate 44 is provided with a mounting groove 41 and a mounting hole 42.

[0055] In the above design, when connecting the two fixing plates 44, the two fixing plates 44 can be connected and fixed together by bolts passing through the positioning holes 45. It should be noted that the fixing plates 44 in this embodiment are square structures, and the positioning holes 45 are respectively located at the four corners of the fixing plates 44. Before installing the fixing plates 44, the outer wall of the support block 31 of the support frame 3 is limited and matched with the inner wall of the strip groove 46 of one of the fixing plates 44, and then the other fixing plate 44 is connected and fixed by bolts to complete the entire installation process. Furthermore, there is a gap between the top of the support block 31 located at the upper part of the support frame 3 and the inner wall of the strip groove 46, so that the support frame 3 can move up or down within the fixing frame 4 formed by the two fixing plates 44, so that the limiting wheel 62 can move between the first position and the second position, thereby opening or closing the vacuum slide valve.

[0056] Preferably, the drive mechanism 2 includes a fixed column 21, a connecting column 22, and a transmission rod assembly 23. The fixed column 21 is fixedly connected to the top of the valve body 1. The connecting column 22 is rotatably connected to the fixed column 21 through a bearing. The connecting column 22 is screwed to the fixed column 21. A connecting rod 221 is provided on the connecting column 22. One end of the connecting rod 221 is located inside the valve body 1. The end of the connecting rod 221 located inside the valve body 1 is hinged to one end of the transmission rod assembly 23. The other end of the transmission rod assembly 23 is hinged to the support frame 3. The connecting column 22 can rotate relative to the fixed column 21 to move up or down to drive the connecting rod 221 to move up or down, and drive the transmission rod assembly 23 to drive the support frame 3 to move up or down.

[0057] In this embodiment, the connecting column 22 and the fixed column 21 are screwed together. The operator can rotate the connecting column 22 so that the connecting column 22 moves upward relative to the fixed column 21, thereby driving the connecting rod 221 upward, which in turn drives the transmission rod upward and the support frame 3 upward. This allows the support frame 3 to be lifted to the top inside the valve body 1, thus making the channel of the valve body 1 fully connected and achieving the maximum opening. The transmission rod assembly 23 can vertically raise and lower the support frame 3 along the height direction of the valve body 1. Specifically, the fixed column 21 can be replaced with a linear drive component such as a cylinder or electric cylinder, thereby ensuring that the support frame 3 can vertically raise and lower along the height direction of the valve body 1 under the action of the drive mechanism 2. This prevents the support frame 3 or the fixed frame 4 from deviating during the raising and lowering process, which would put excessive pressure on the inner wall of the valve body 1 and affect the stability of the valve body 1.

[0058] Preferably, the transmission rod assembly 23 includes a first plate 231, a second plate 232, and a third plate 233. One end of the first plate 231 is hinged to the connecting rod 221, and the other end is hinged to the second plate 232. One end of the second plate 232 is hinged to the top of the valve body 1, and the other end is hinged to one end of the third plate 233. The other end of the third plate 233 is hinged to the top of the support frame 3.

[0059] With the above design, when the first plate 231 moves upward via the connecting rod 221, it can drive the second plate 232 upward through the hinge. One end of the second plate 232 is hinged to the top inside the valve body 1, so the other end of the second plate 232 will rotate at the top inside the valve body 1, which drives the third plate 233 upward, and drives the support frame 3 upward through the third plate 233. It should be noted that the transmission rod assembly 23 can also be replaced by a telescopic rod, which can also realize the vertical lifting of the support frame 3.

[0060] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A vacuum plug valve, characterized in that The device includes a valve body, a fixed frame, a support frame, a valve plate, and a spreading assembly. The fixed frame is located inside the valve body, and the support frame is movably connected inside the fixed frame. The valve body is provided with a drive mechanism for driving the support frame to move up or down. The valve plate is connected to both sides of the fixed frame by elastic elements, and the spreading assembly is fixedly connected to both sides of the support frame. The valve plate has a first position and a second position, with the first position located above the second position. The spreading assembly contacts the valve plate and can move between the first position and the second position. The distance between the two valve plates at the opposite first positions is L1, and the distance between the two valve plates at the opposite second positions is L2, where L1 is greater than L2. When the support frame moves downwards, the spreading component moves from the first position to the second position, and the spreading component gradually spreads the two valve plates apart; when the support frame moves upwards, the spreading component moves from the second position to the first position, and the two valve plates gradually retract under the action of the elastic member; when the spreading component is in the second position, the support frame can drive the fixed frame to move upwards.

2. The vacuum plug valve according to claim 1, characterized in that The valve plate has an arc-shaped groove and a limiting groove on the side near the support frame. The limiting groove is designed to be inclined, and its extension direction is inclined inward towards the thickness direction of the valve plate. The arc-shaped groove is connected to the limiting groove, and the inwardly inclined end of the arc-shaped groove and the limiting groove are adjacent. The spreading component is in contact with the inner wall of the limiting groove or the inner wall of the arc-shaped groove. The arc-shaped groove is the second position, and the limiting groove is the first position.

3. The vacuum plug valve of claim 1, wherein, The mounting bracket has a mounting groove and a mounting hole for the mounting block to pass through. The mounting groove and the mounting hole are connected. The mounting groove is located on the side of the mounting bracket away from the valve plate. The valve plate has a mounting block on the side close to the mounting bracket. The mounting block has an elastic retaining ring and a limiting plate. The limiting plate is sleeved on the outer peripheral wall of the mounting block. The elastic retaining ring is fixed on the outer peripheral wall of the mounting block and is located on the side of the limiting plate away from the valve plate. The limiting plate is in a limiting fit with the end wall of the mounting groove. One end of the elastic element is fixedly connected to one side of the limiting plate, and the other end is fixedly connected to the side of the elastic retaining ring close to the limiting plate. The valve plate has a sealing groove for installing a sealing ring on the inner wall side close to the valve body.

4. The vacuum slide gate valve according to claim 3, characterized in that, The mounting block has a groove located on its outer peripheral wall, and the elastic retaining ring is fitted onto the mounting block and located within the groove.

5. The vacuum slide gate valve according to claim 1, characterized in that, The support frame is provided with support blocks, which are distributed on both sides of the support frame. The spreading assembly includes a connecting shaft and a limiting wheel. The support block is provided with a positioning groove. The connecting shaft passes through the positioning groove and is fixedly connected to the support block. The limiting wheel is sleeved on the connecting shaft and located in the positioning groove. The outer peripheral wall of the limiting wheel protrudes from the support block and contacts the valve plate.

6. The vacuum slide gate valve according to claim 1, characterized in that, The outer peripheral wall of the support frame is provided with a first shaft arranged horizontally along its width direction and a second shaft arranged horizontally along its length direction. The first shaft is provided with a rotatable first guide wheel, and the second shaft is provided with a rotatable second guide wheel. The support frame makes rolling contact with the inner wall of the valve body through the first guide wheel and the second guide wheel.

7. The vacuum slide gate valve according to claim 1, characterized in that, The bottom of the fixing frame is provided with a third shaft arranged horizontally along its length direction, and the third shaft is provided with a rotatable positioning wheel, the outer peripheral wall of the positioning wheel protruding from the bottom of the fixing frame.

8. The vacuum slide gate valve according to claim 3, characterized in that, The fixing frame includes symmetrically arranged fixing plates. Each fixing plate has multiple positioning holes. Two fixing plates are connected and fixed by bolts passing through the positioning holes. Each fixing plate has a strip groove. When two fixing plates are connected by bolts, the inner wall of the strip groove is matched with the outer wall of the support block. The support frame is located between the two fixing plates. Each fixing plate has the mounting groove and the mounting hole.

9. The vacuum slide gate valve according to claim 1, characterized in that, The driving mechanism includes a fixed column, a connecting column, and a transmission rod assembly. The fixed column is fixedly connected to the top of the valve body. The connecting column is rotatably connected to the fixed column via a bearing. The connecting column is screwed to the fixed column. A connecting rod is provided on the connecting column. One end of the connecting rod is located inside the valve body. The end of the connecting rod inside the valve body is hinged to one end of the transmission rod assembly. The other end of the transmission rod assembly is hinged to the support frame. The connecting column can rotate relative to the fixed column to move up or down to drive the connecting rod to move up or down, and drive the transmission rod assembly to drive the support frame to move up or down.

10. The vacuum slide gate valve according to claim 9, characterized in that, The transmission rod assembly includes a first plate, a second plate, and a third plate. One end of the first plate is hinged to the connecting rod, and the other end is hinged to the second plate. One end of the second plate is hinged to the top of the valve body, and the other end is hinged to one end of the third plate. The other end of the third plate is hinged to the top of the support frame.

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