Tool clamp for machining gate valve flashboard sealing face

Abstract

The invention relates to the technical field of gate plate machining, and discloses a tool clamp for machining a gate valve gate plate sealing face, the tool clamp comprises a supporting bottom plate, and the bottom of the supporting bottom plate is fixedly connected with a sliding clamping device; the sliding clamping device comprises a first supporting rod, a sliding cylindrical block is slidably connected to the surface of the first supporting rod, a rotating connecting block is fixedly connected to the surface of the sliding cylindrical block, a rotating connecting rod is rotatably connected to the interior of the rotating connecting block, and a first telescopic device is fixedly connected to the bottom of the sliding cylindrical block; a cross-shaped sliding rail supporting plate is fixedly connected to the bottom of the first telescopic device, and a reset spring plate is fixedly connected to the surface of the cross-shaped sliding rail supporting plate. The four slow-falling clamping devices can be driven by the sliding clamping device to move towards the center of the supporting bottom plate from four different directions at the same speed, and therefore the center of the machined flashboard can be rapidly overlapped with the center of the supporting bottom plate.

Description

Technical Field

[0001] The invention relates to the technical field of gate plate processing, in particular to a tooling fixture for processing a sealing surface of a gate valve gate plate. Background Art

[0002] Gate valves are widely used in the industrial field to control the flow of fluids in valve body pipelines. To ensure reliable sealing of gate valves, the sealing surfaces of the gate and valve seat are usually designed as a wedge-shaped structure with a wide top and a narrow bottom. When the gate is closed, the sealing is achieved by gradually squeezing the sealing surfaces on both sides. This places high demands on the machining accuracy of the gate sealing surface to ensure sealing performance and service life.

[0003] The patent application with application number CN201510057251.8 discloses a tooling fixture for processing the sealing surface of a gate valve gate disc, which cooperates with the gate valve gate disc and includes a clamping disc, a sloped ring plate, a clamping ring plate for fixing the gate disc, a pressure block and a spherical hinge; the sloped ring plate is fixed on the clamping disc and has an inclined surface on the top; the clamping ring plate is arranged on the inclined surface of the sloped ring plate, and the outer side wall is hinged to one end of the spherical hinge.

[0004] The current fixture used for processing the sealing surface of the gate valve gate plate ensures that the left and right sides of the gate plate are completely aligned based on the thickness of the gate plate by clamping the three positioning mechanisms in the fixture with the guide grooves on both sides of the gate plate and the T-slot of the valve stem of the gate plate. However, the device takes too long in the clamping process. In view of this, the test device is improved. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a tooling fixture for machining a sealing surface of a gate valve gate plate to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a tooling fixture for machining a sealing surface of a gate valve gate, comprising a supporting bottom plate, a sliding clamping device being fixedly connected to the bottom of the supporting bottom plate;

[0007] The sliding clamping device includes a first support rod, a sliding cylindrical block is slidably connected to the surface of the first support rod, a rotating connecting block is fixedly connected to the surface of the sliding cylindrical block, a rotating connecting rod is rotatably connected to the inside of the rotating connecting block, a first telescopic device is fixedly connected to the bottom of the sliding cylindrical block, a cross-shaped slide rail support plate is fixedly connected to the bottom of the first telescopic device, a return spring plate is fixedly connected to the surface of the cross-shaped slide rail support plate, a slow-fall clamping device is slidably connected to the surface of the cross-shaped slide rail support plate, and the sliding cylindrical block is used to drive four slow-fall clamping devices to move at the same speed.

[0008] Preferably, the top of the first support rod is fixedly connected to the bottom of the support base plate, the axis of the first support rod coincides with the axis of the support base plate, the axis of the sliding cylindrical block coincides with the axis of the first support rod, the number of the rotating connecting blocks is eight, which are respectively located on the surface of the sliding cylindrical block and the slow-fall clamping device, and the rotating connecting block is used to flexibly connect the sliding cylindrical block with the slow-fall clamping device by rotating the connecting rod.

[0009] Preferably, the number of the rotating connecting rods is four, which are located between two rotating connecting blocks in the same direction; the number of the first telescopic devices is two, and they are symmetrical along the axis of the first support rod; the number of the reset spring plates is eight, which are respectively located on the slide rails in four directions of the cross-shaped slide rail support plate; the number of the slow-fall clamping devices is four, which are respectively located on the slide rails in four directions of the cross-shaped slide rail support plate; the slow-fall clamping device is located between two reset spring plates, and the reset spring plate is used to use the kinetic energy generated during the movement of the slow-fall clamping device to clean the cutting waste on the surface of the cross-shaped slide rail support plate.

[0010] Preferably, the slow-fall clamping device includes a limiting sleeve, a two-way telescopic device is fixedly connected to the top of the limiting sleeve, arc-shaped clamping blocks are fixedly connected at both ends of the two-way telescopic device, a conical baffle device is fixedly connected to the cylindrical surface of the limiting sleeve, an inverted T-shaped sliding rod is slidably connected inside the limiting sleeve, the end of the inverted T-shaped sliding rod away from the limiting sleeve is fixedly connected to a rectangular pressure plate, a second telescopic device is movably connected to the bottom of the inverted T-shaped sliding rod, a first compression spring is fixedly connected to the top plane with a larger area of ​​the inverted T-shaped sliding rod, and the limiting sleeve is used to drive the slow-fall clamping device to move along the surface of the cross-shaped slide rail support plate.

[0011] Preferably, the bottom of the limiting sleeve is slidably connected to the top of the cross-shaped slide rail support plate, and there are two bidirectional telescopic devices, which are symmetrical along the axis of the limiting sleeve, and the axis of the bidirectional telescopic device is perpendicular to the axis of the limiting sleeve. The bidirectional telescopic device is used to control the friction between the arc-shaped clamping block and the inverted T-shaped sliding rod.

[0012] Preferably, the number of the arc-shaped clamping blocks is two, and the two arc-shaped clamping blocks are fixedly connected to the end faces of the two two-way telescopic devices in the same direction, the inverted T-shaped sliding rod is located between the two arc-shaped clamping blocks and the two two-way telescopic devices, the cylindrical surface of the inverted T-shaped sliding rod is slidably connected to the conical baffle device, the second telescopic device is located inside the limiting sleeve, the top of the first compression spring is fixedly connected to the inside of the limiting sleeve, the surface of the supporting bottom plate is fixedly connected with a clamping and flipping device, and the first compression spring is used to provide pulling force for the free fall of the inverted T-shaped sliding rod.

[0013] Preferably, the clamping and flipping device includes a third telescopic device, the top of the third telescopic device is fixedly connected to a gear transmission device, the internal gears of the gear transmission device are connected to the gear transmission telescopic device, the end of the gear transmission telescopic device away from the gear transmission device is internally slidably connected to an inverted L-shaped clamping plate, the end of the gear transmission telescopic device away from the gear transmission device is provided with a clamping plate, the clamping plate is internally fixedly connected to a telescopic clamping rod, the surface of the telescopic clamping rod is fixedly connected to a rectangular pressure plate, and the gear transmission device is used to drive the gear transmission telescopic device to rotate.

[0014] Preferably, the third telescopic device is fixedly connected to the supporting base plate, the gear-driven telescopic device is rotatably connected to the inside of the third telescopic device, a circular hole is provided in the middle of the part of the inverted L-shaped clamping plate located inside the gear-driven telescopic device, a rectangular through groove is horizontally provided on the surface of the clamping plate, the cylindrical surface of the clamping plate is fixedly connected to the inverted L-shaped clamping plate, the diameter of the telescopic rod of the telescopic clamping rod is consistent with the diameter of the circular hole on the surface of the inverted L-shaped clamping plate, the rectangular pressure plate is slidably connected to the rectangular through groove on the surface of the clamping plate, and the telescopic clamping rod is used to connect the gear-driven telescopic device and the inverted L-shaped clamping plate.

[0015] Compared with the prior art, the present invention provides a fixture for machining the sealing surface of a gate valve gate, which has the following beneficial effects:

[0016] 1. The present invention can drive four slow-falling clamping devices through the sliding clamping device to move toward the center of the supporting base plate from four different directions at the same speed, so that the center of the gate plate to be processed can be quickly coincident with the center of the supporting base plate, reducing the time for finding the processing center during the clamping process. The time required for the tooling fixture used to clamp the gate plate for processing the sealing surface of the gate valve gate plate is reduced through the above content.

[0017] 2. The present invention can control the inverted T-shaped sliding rod to fall during the movement of the limiting sleeve through the slow-fall clamping device, and use gravity to make the rectangular pressure plate contact with the processed gate plate, so as to avoid damage to the processed surface of the gate plate caused by excessive pressure applied by the rectangular pressure plate, and then fix the up and down degrees of freedom of the inverted T-shaped sliding rod by enhancing the friction between the arc-shaped clamping block and the inverted T-shaped sliding rod, so as to reduce the time required for the tooling fixture used to clamp the gate plate for processing the sealing surface of the gate valve gate plate.

[0018] 3. The present invention can use the clamping and flipping device to quickly rotate the gate plate to be processed 180 degrees after one surface of the gate plate is processed, thereby avoiding the need to search for the processing center of the gate plate to be processed again. The above content reduces the time required for the tooling fixture used to clamp the gate plate for processing the sealing surface of the gate valve gate plate.

[0019] 4. The present invention can use the clamping and flipping device to quickly remove the original clamping plate when the clamping plate is no longer suitable for clamping the gate plate to be processed due to reasons such as size and shape, and then install a new clamping plate at the same speed, thereby reducing the time required for the tooling fixture used to clamp the gate plate for processing the sealing surface of the gate valve gate plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the sliding clamping device of the present invention;

[0022] Figure 3 For the present invention Figure 2 A is an enlarged schematic diagram;

[0023] Figure 4 For the present invention Figure 2 A magnified schematic diagram of B;

[0024] Figure 5 It is a structural schematic diagram of the slow-fall clamping device of the present invention;

[0025] Figure 6 For the present invention Figure 5 A magnified schematic diagram of middle C;

[0026] Figure 7 is a cross-sectional view of the slow-fall clamping device of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the clamping and flipping device of the present invention;

[0028] Fig. 9 For the present invention Figure 8 A magnified schematic diagram of D in the middle.

[0029] In the figure: 1. Support base plate; 2. Sliding clamping device; 201. First support rod; 202. Sliding cylindrical block; 203. Rotating connecting block; 204. Rotating connecting rod; 205. First telescopic device; 206. Cross-shaped slide rail support plate; 207. Reset spring plate; 208. Slow-down clamping device; 2081. Limiting sleeve; 2082. Two-way telescopic device; 2083. Arc clamping block; 2084. Conical baffle device; 2085. Inverted T-shaped sliding rod; 2086. Rectangular pressure plate; 2087. Second telescopic device; 2088. First compression spring; 3. Clamping and flipping device; 301. Third telescopic device; 302. Gear transmission device; 303. Gear transmission telescopic device; 304. Inverted L-shaped clamping plate; 305. Clamping plate; 306. Telescopic clamping rod; 307. Rectangular pressure plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] For example, see Figure 1-7 , the present invention provides a technical solution: a fixture for processing the sealing surface of a gate valve gate, comprising a supporting base plate 1, a sliding clamping device 2 is fixedly connected to the bottom of the supporting base plate 1;

[0034] The sliding clamping device 2 includes a first support rod 201, the top of the first support rod 201 is fixedly connected to the bottom of the support base plate 1, the axis of the first support rod 201 coincides with the axis of the support base plate 1, and the surface of the first support rod 201 is slidably connected with a sliding cylindrical block 202, the sliding cylindrical block 202 is used to drive the four slow-falling clamping devices 208 to move at the same speed, the axis of the sliding cylindrical block 202 coincides with the axis of the first support rod 201, and the surface of the sliding cylindrical block 202 is fixedly connected with a rotating connection block 2 03, the number of rotating connecting blocks 203 is eight, which are respectively located on the surface of the sliding cylindrical block 202 and the slow-fall clamping device 208. The rotating connecting block 203 is used to movably connect the sliding cylindrical block 202 and the slow-fall clamping device 208 through the rotating connecting rod 204. The rotating connecting block 203 is rotatably connected with a rotating connecting rod 204 inside. The number of rotating connecting rods 204 is four, which are located between two rotating connecting blocks 203 in the same direction. The bottom of the sliding cylindrical block 202 is fixedly connected with a first telescopic The first telescopic device 205 is provided with two first telescopic devices 205, and is symmetrical along the axis of the first support rod 201. A cross-shaped slide rail support plate 206 is fixedly connected to the bottom of the first telescopic device 205. The cross-shaped slide rail support plate 206 is used to provide support for the slow-fall clamping device 208 while limiting the moving path of the slow-fall clamping device 208. A reset spring plate 207 is fixedly connected to the surface of the cross-shaped slide rail support plate 206. The reset spring plates 207 are eight in number and are respectively located at the cross-shaped slide rail support plate 206 and the cross-shaped slide rail support plate 206. On the slide rails in four directions of the rail support plate 206, the reset spring plate 207 is used to utilize the kinetic energy generated during the movement of the slow-fall clamping device 208 to clean the cutting waste on the surface of the cross-shaped slide rail support plate 206. The number of the slow-fall clamping devices 208 is four, which are respectively located on the slide rails in four directions of the cross-shaped slide rail support plate 206. The slow-fall clamping device 208 is located between two reset spring plates 207, and the surface of the cross-shaped slide rail support plate 206 is slidably connected with the slow-fall clamping device 208.

[0035] The slow-fall clamping device 208 includes a limiting sleeve 2081, the bottom of the limiting sleeve 2081 is slidably connected to the top of the cross-shaped slide rail support plate 206, the limiting sleeve 2081 is used to drive the slow-fall clamping device 208 to move along the surface of the cross-shaped slide rail support plate 206, and the top of the limiting sleeve 2081 is fixedly connected with a two-way telescopic device 2082, the number of the two-way telescopic devices 2082 is two, and the two two-way telescopic devices 2082 are symmetrical along the axis of the limiting sleeve 2081. The axis of the contraction device 2082 is perpendicular to the axis of the limiting sleeve 2081. The bidirectional telescopic device 2082 is used to control the friction between the arc clamping block 2083 and the inverted T-shaped sliding rod 2085. The two ends of the bidirectional telescopic device 2082 are fixedly connected with arc clamping blocks 2083. The number of arc clamping blocks 2083 is two. The two arc clamping blocks 2083 are fixedly connected to the end faces of the two bidirectional telescopic devices 2082 in the same direction. The cylindrical surface of the limiting sleeve 2081 is fixedly connected with a conical baffle device 208 4. The limiting sleeve 2081 is internally slidably connected with an inverted T-shaped sliding rod 2085, which is located between the two arc-shaped clamping blocks 2083 and the two bidirectional telescopic devices 2082. The cylindrical surface of the inverted T-shaped sliding rod 2085 is slidably connected with the conical baffle device 2084. The end of the inverted T-shaped sliding rod 2085 away from the limiting sleeve 2081 is fixedly connected with a rectangular pressing plate 2086. The bottom of the inverted T-shaped sliding rod 2085 is movably connected with a second telescopic device 2087. The retractable device 2087 is used to provide an upward moving force for the inverted T-shaped sliding rod 2085. The second retractable device 2087 is located inside the limiting sleeve 2081. The top plane with a larger area of ​​the inverted T-shaped sliding rod 2085 is fixedly connected with a first compression spring 2088. The top of the first compression spring 2088 is fixedly connected to the inside of the limiting sleeve 2081. The first compression spring 2088 is used to provide a pulling force for the free fall of the inverted T-shaped sliding rod 2085. The surface of the supporting base plate 1 is fixedly connected with a clamping and flipping device 3.

[0036] Working principle of the first embodiment: when the gate valve plate needs to be clamped, the gate valve plate is first placed on the top of the support bottom plate 1, and then the first telescopic device 205 is extended to make the sliding cylindrical block 202 move upward along the first support rod 201, and the sliding cylindrical block 202 moving upward drives the slow-falling clamping device 208 to move along the slide rail of the cross-shaped slide rail support plate 206 by rotating the connecting rod 204, so that the four slow-falling clamping devices 208 are in contact with the side of the gate valve plate, and the center of the gate valve plate can be made to coincide with the center of the support bottom plate 1 through the four synchronously moving slow-falling clamping devices 208;

[0037] During the process of moving the slow-fall clamping device 208, the second telescopic device 2087 is controlled to contract, and then the inverted T-shaped sliding rod 2085, which has lost its supporting force, moves downward under the action of gravity until the bottom surface of the rectangular pressure plate 2086 contacts the gate plate of the gate valve, and then the two arc-shaped clamping blocks 2083 are driven to move in opposite directions through the contraction of the two-way telescopic device 2082, so that the two apply pressure in opposite directions to the inverted T-shaped sliding rod 2085, thereby fixing and restricting the movement of the inverted T-shaped sliding rod 2085. Such a clamping method uses gravity to make the bottom surface of the rectangular pressure plate 2086 contact the gate plate of the gate valve, which can avoid damage to the gate plate surface caused by excessive applied pressure, and because the inverted T-shaped sliding rod 2085 is subjected to the pulling force of the first compression spring 2088 during the falling process, the falling speed of the inverted T-shaped sliding rod 2085 is slow, which can avoid the occurrence of safety accidents to a certain extent;

[0038] Processing waste will be generated in the process of processing the gate valve gate plate. Under the action of gravity and other forces, the processing waste may fall onto the surface of the cross-shaped slide rail support plate 206. In the process of the slow-falling clamping device 208 moving along the cross-shaped slide rail support plate 206, the waste falling on the surface of the cross-shaped slide rail support plate 206 is pushed and moved by the slow-falling clamping device 208. When the slow-falling clamping device 208 moves to a certain position close to the end face of the cross-shaped slide rail support plate 206, the slow-falling clamping device 208 is resisted by the reset spring plate 207. As the clamping device 208 continues to move, the reset spring plate 207 is pressed and moves toward the end face of the cross-shaped slide rail support plate 206, and the compression spring connected behind the reset spring plate 207 is compressed. During this process, the waste is located between the slow-fall clamping device 208 and the reset spring plate 207. When the slow-fall clamping device 208 changes its moving direction, the pressure on the reset spring plate 207 disappears, and the compression spring rebounds, bouncing the waste away, thereby preventing the fertilizer from accumulating on the surface of the cross-shaped slide rail support plate 206 and affecting the movement of the slow-fall clamping device 208.

[0039] Example 2, based on Example 1, please refer to Figure 8-9The present invention provides a technical solution: the clamping and flipping device 3 includes a third telescopic device 301, the third telescopic device 301 is fixedly connected to the supporting bottom plate 1, the top of the third telescopic device 301 is fixedly connected with a gear transmission device 302, the gear transmission device 302 is used to drive the gear transmission telescopic device 303 to rotate, the internal gear of the gear transmission device 302 is connected with the gear transmission telescopic device 303, the gear transmission telescopic device 303 is rotationally connected with the third telescopic device 301, the end of the gear transmission telescopic device 303 away from the gear transmission device 302 is internally slidably connected with an inverted L-shaped clamping plate 304, the inverted L-shaped clamping plate 304 is used to connect the gear transmission telescopic device 303 and the clamping plate 305, limit the axial movement of the two, and telescope. The clamping rod 306 is used to connect the gear transmission telescopic device 303 and the inverted L-shaped clamping plate 304. A circular hole is opened in the middle of the inverted L-shaped clamping plate 304 located inside the gear transmission telescopic device 303. A clamping plate 305 is arranged at the end of the gear transmission telescopic device 303 away from the gear transmission device 302. A rectangular through groove is opened horizontally on the surface of the clamping plate 305. The cylindrical surface of the clamping plate 305 is fixedly connected to the inverted L-shaped clamping plate 304. A telescopic clamping rod 306 is fixedly connected inside the clamping plate 305. The diameter of the telescopic clamping rod 306 is consistent with the diameter of the circular hole on the surface of the inverted L-shaped clamping plate 304. A rectangular pressure plate 307 is fixedly connected to the surface of the telescopic clamping rod 306. The rectangular pressure plate 307 is slidably connected to the rectangular through groove on the surface of the clamping plate 305.

[0040] The working principle of the second embodiment is as follows: after one side of the gate valve disc is processed, the gear transmission telescopic device 303 is extended to make the clamping plate 305 contact the side of the gate valve disc and enhance the friction between the clamping plate 305 and the gate valve disc, and then the third telescopic device 301 is extended to raise the position of the gate valve disc, and then the gear transmission telescopic device 302 drives the gear transmission telescopic device 303 to rotate, and the gear transmission telescopic device 303 drives the clamping plate 305 to rotate, and the gate valve disc is rotated 180 degrees, and then a pad is placed on the surface of the supporting bottom plate 1, Then the third telescopic device 301 retracts to drive the gate valve gate plate to descend until the processed surface of the gate valve gate plate contacts the pad. When the clamping plate 305 is not suitable for the clamping work of the new gate valve gate plate, pressure is applied to the rectangular pressure plate 307 to compress the compression spring of the telescopic clamping rod 306, driving the clamping rod to move, and then the inverted L-shaped clamping plate 304 is moved upward to separate the clamping plate 305 from the gear transmission telescopic device 303, and then the clamping plate 305 suitable for the new gate valve gate plate is installed on the gear transmission telescopic device 303, and then work is carried out.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for machining a sealing surface of a gate valve disc, comprising a supporting base plate (1), characterized in that: The bottom of the supporting base plate (1) is fixedly connected with a sliding clamping device (2); The sliding clamping device (2) comprises a first support rod (201), the surface of the first support rod (201) is slidably connected to a sliding cylindrical block (202), the surface of the sliding cylindrical block (202) is fixedly connected to a rotating connecting block (203), the rotating connecting block (203) is rotatably connected to a rotating connecting rod (204) inside, the bottom of the sliding cylindrical block (202) is fixedly connected to a first telescopic device (205), the bottom of the first telescopic device (205) is fixedly connected to a cross-shaped slide rail support plate (206), the surface of the cross-shaped slide rail support plate (206) is fixedly connected to a return spring plate (207), the surface of the cross-shaped slide rail support plate (206) is slidably connected to a slow-fall clamping device (208), and the sliding cylindrical block (202) is used to drive four slow-fall clamping devices (208) to move at the same speed.

2. A fixture for machining the sealing surface of a gate valve according to claim 1, characterized in that: The top of the first support rod (201) is fixedly connected to the bottom of the support base plate (1), the axis of the first support rod (201) coincides with the axis of the support base plate (1), the axis of the sliding cylindrical block (202) coincides with the axis of the first support rod (201), and the number of the rotating connecting blocks (203) is eight, which are respectively located on the surface of the sliding cylindrical block (202) and the slow-fall clamping device (208), and the rotating connecting blocks (203) are used to movably connect the sliding cylindrical block (202) and the slow-fall clamping device (208) through the rotating connecting rod (204).

3. A fixture for machining the sealing surface of a gate valve according to claim 1, characterized in that: The number of the rotating connecting rods (204) is four and they are located between two rotating connecting blocks (203) in the same direction. The number of the first telescopic devices (205) is two and they are symmetrical along the axis of the first support rod (201). The number of the reset spring plates (207) is eight and they are located on the slide rails in four directions of the cross-shaped slide rail support plate (206). The number of the slow-falling clamping devices (208) is four and they are located on the slide rails in four directions of the cross-shaped slide rail support plate (206). The slow-falling clamping device (208) is located between two reset spring plates (207). The reset spring plate (207) is used to clean the cutting waste on the surface of the cross-shaped slide rail support plate (206) by using the kinetic energy generated during the movement of the slow-falling clamping device (208).

4. A fixture for machining the sealing surface of a gate valve according to claim 3, characterized in that: The slow-fall clamping device (208) comprises a limiting shaft sleeve (2081), a bidirectional telescopic device (2082) being fixedly connected to the top of the limiting shaft sleeve (2081), arc-shaped clamping blocks (2083) being fixedly connected to both ends of the bidirectional telescopic device (2082), a conical baffle device (2084) being fixedly connected to the cylindrical surface of the limiting shaft sleeve (2081), an inverted T-shaped sliding rod (2085) being slidably connected to the interior of the limiting shaft sleeve (2081), and the inverted T-shaped sliding rod (2085) being fixedly connected to the cylindrical surface of the limiting shaft sleeve (2081). One end of the movable rod (2085) away from the limiting shaft sleeve (2081) is fixedly connected to a rectangular pressure plate (2086); the bottom of the inverted T-shaped sliding rod (2085) is movably connected to a second telescopic device (2087); the top plane with a larger area of ​​the inverted T-shaped sliding rod (2085) is fixedly connected to a first compression spring (2088); and the limiting shaft sleeve (2081) is used to drive the slow-falling clamping device (208) to move along the surface of the cross-shaped slide rail support plate (206).

5. A fixture for machining the sealing surface of a gate valve according to claim 4, characterized in that: The bottom of the limiting shaft sleeve (2081) is slidably connected to the top of the cross-shaped slide rail support plate (206), and the number of the two-way telescopic devices (2082) is two. The two two-way telescopic devices (2082) are symmetrical along the axis of the limiting shaft sleeve (2081), and the axis of the two-way telescopic device (2082) is perpendicular to the axis of the limiting shaft sleeve (2081). The two-way telescopic device (2082) is used to control the friction between the arc-shaped clamping block (2083) and the inverted T-shaped sliding rod (2085).

6. A fixture for machining the sealing surface of a gate valve according to claim 4, characterized in that: The number of the arc-shaped clamping blocks (2083) is two, and the two arc-shaped clamping blocks (2083) are fixedly connected to the end faces of the two bidirectional telescopic devices (2082) in the same direction. The inverted T-shaped sliding rod (2085) is located between the two arc-shaped clamping blocks (2083) and the two bidirectional telescopic devices (2082). The cylindrical surface of the inverted T-shaped sliding rod (2085) is slidably connected to the conical baffle device (2084). The second telescopic device (2087) is located inside the limiting shaft sleeve (2081). The top of the first compression spring (2088) is fixedly connected to the inside of the limiting shaft sleeve (2081). The surface of the support bottom plate (1) is fixedly connected with a clamping and flipping device (3). The first compression spring (2088) is used to provide a pulling force for the free fall of the inverted T-shaped sliding rod (2085).

7. A fixture for machining the sealing surface of a gate valve according to claim 6, characterized in that: The clamping and flipping device (3) comprises a third telescopic device (301), the top of the third telescopic device (301) is fixedly connected to a gear transmission device (302), the gear inside the gear transmission device (302) is connected to a gear transmission telescopic device (303), an end of the gear transmission telescopic device (303) away from the gear transmission device (302) is slidably connected to an inverted L-shaped clamping plate (304), an end of the gear transmission telescopic device (303) away from the gear transmission device (302) is provided with a clamping plate (305), a telescopic clamping rod (306) is fixedly connected to the clamping plate (305), a rectangular pressure plate (307) is fixedly connected to the surface of the telescopic clamping rod (306), and the gear transmission device (302) is used to drive the gear transmission telescopic device (303) to rotate.

8. A fixture for machining the sealing surface of a gate valve according to claim 7, characterized in that: The third telescopic device (301) is fixedly connected to the supporting base plate (1); the gear transmission telescopic device (303) is rotatably connected to the inside of the third telescopic device (301); a circular hole is provided in the middle of the part of the inverted L-shaped clamping plate (304) located inside the gear transmission telescopic device (303); a rectangular through groove is horizontally provided on the surface of the clamping plate (305); the cylindrical surface of the clamping plate (305) is fixedly connected to the inverted L-shaped clamping plate (304); the diameter of the telescopic clamping rod (306) is consistent with the diameter of the circular hole on the surface of the inverted L-shaped clamping plate (304); the rectangular pressure plate (307) is slidably connected to the rectangular through groove on the surface of the clamping plate (305); and the telescopic clamping rod (306) is used to connect the gear transmission telescopic device (303) and the inverted L-shaped clamping plate (304).

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