A clamping device for stop valve processing

Abstract

The present invention relates to the field of drilling clamping, and in particular to a clamping device for processing stop valves. The technical problem of the present invention is that when drilling a stop valve, the stop valve needs to be adjusted multiple times, and the manual adjustment of the position of the stop valve is not accurate enough. When the stop valve is clamped with a clamp, it is easy to clamp it crooked, which will reduce the accuracy of the stop valve drilling and reduce the efficiency of the stop valve drilling. A clamping device for processing a stop valve includes a bracket, a drilling machine and a slot plate, etc.; the bracket is provided with a drilling machine, and the bracket is fixedly installed with a slot plate. The present invention presses the stop valve body through two clamping plates, so that the bottom of the stop valve body is more closely fitted with the baffle, thereby correcting the stop valve body. In this way, the stop valve body can be corrected, pressed and clamped more conveniently and quickly, thereby improving the accuracy and efficiency of the stop valve body drilling.

Description

Technical Field

[0001] The invention relates to the field of drilling clamping, and in particular to a clamping device used for processing stop valves. Background Art

[0002] The stop valve, also known as the gate valve, is one of the most widely used valves. The reason why it is so popular is that the friction between the sealing surfaces during opening and closing is small, it is relatively durable, the opening height is not large, it is easy to manufacture and maintain, and it is suitable not only for medium and low pressures, but also for high pressures.

[0003] A pressure gauge and other objects need to be installed on the stop valve, so a hole needs to be drilled on the side of the stop valve for the installation of the pressure gauge and other objects. When drilling a hole in the stop valve, the stop valve needs to be adjusted several times and then clamped with a clamp so that the part of the stop valve to be drilled can be aligned with the drill bit. When the stop valve is clamped with a clamp, it is easy to clamp it crooked, which will reduce the accuracy of the stop valve drilling and reduce the efficiency of the stop valve drilling. Summary of the invention

[0004] The purpose of the present invention is to solve the problems that when drilling a stop valve, the stop valve needs to be adjusted multiple times, the manual adjustment of the position of the stop valve is not accurate enough, and the stop valve is easily distorted when clamped with a clamp, which will reduce the accuracy of the stop valve drilling and the efficiency of the stop valve drilling. A clamping device for stop valve processing is now provided, which can fully correct and fix the stop valve, so that the stop valve portion to be drilled can be accurately aligned with the drill bit, thereby improving the accuracy of the stop valve drilling and improving the efficiency of the stop valve drilling.

[0005] The technical implementation scheme of the present invention is: a clamping device for stop valve processing, including a bracket, a drilling machine, a groove plate, a baffle plate, a shell, a pressing mechanism and a clamping mechanism. The bracket is provided with a drilling machine, and a groove plate is fixedly installed on the bracket. A placement groove is opened on one side of the groove plate, and two baffle plates are installed on the side of the groove plate close to the placement groove. A shell is installed on the other two sides of the groove plate respectively, and a stop valve body is placed in the placement groove of the groove plate. A pressing mechanism is provided on the groove plate and the shell, and the pressing mechanism is used to press the stop valve body. A clamping mechanism is provided on the groove plate and the pressing mechanism, and the clamping mechanism is used to clamp the stop valve body.

[0006] More preferably, the upper parts of the two baffles are both rough surfaces.

[0007] More preferably, the pressing mechanism includes a slide rail, an electric slider, a drive frame, a pressing round block and ball bearings. A slide rail is respectively installed on the side close to each other in the two shells, and an electric slider is slidably provided on the two slide rails. A drive frame is installed between one side of the two electric sliders, and the drive frame is slidably connected to the two shells. A pressing round block is slidably provided on the groove plate, and two driving grooves are opened on one side of the pressing round block, and a plurality of ball bearings are embedded on the other side of the pressing round block.

[0008] More preferably, the two driving grooves are each composed of an oblique groove and a vertical groove, and the upper part of the driving frame is located in the oblique grooves of the two driving grooves.

[0009] More preferably, the clamping mechanism includes a rotating shaft, a clamping plate, steel balls, a column gear, a rack rack, a sliding rod and a return spring, a rotating shaft is rotatably provided in each of the two shells, a clamping plate is fixedly installed in the middle of the two rotating shafts, the upper parts of the two clamping plates pass through the slot plates, and a number of steel balls are evenly embedded on the sides of the two clamping plates close to each other, a column gear is respectively installed on one side of the two rotating shafts, a rack rack is slidably provided on both sides of the slot plate, the two rack racks are respectively meshed with the two column gears, a sliding rod is slidably provided on the two rack racks, a flange is provided at the upper end of the two sliding rods, a return spring is respectively provided between the slide rod on the same side and the rack rack on the same side, and the lower ends of the two sliding rods are fixedly connected to the upper part of the driving frame.

[0010] More preferably, a correction mechanism is also included, which is arranged on two electric sliders. The correction mechanism is used to correct the stop valve body. The correction mechanism includes a lifting frame and a hollow correction column. A lifting frame is fixedly installed between the sides of the two electric sliders close to each other, and a hollow correction column is fixedly installed in the middle of the lifting frame. The hollow correction column is located directly below the stop valve body.

[0011] More preferably, the upper end of the hollow correction column is set to an arc surface, and the diameter of the middle part of the hollow correction column is smaller than the inner diameter of the circular hole in the lower part of the stop valve body.

[0012] More preferably, it also includes a tightening mechanism, which is arranged on the lifting frame, the hollow correction column and the groove plate, and the tightening mechanism is used to tighten the stop valve body, the tightening mechanism includes a connecting plate, a vertical shaft, an arc groove plate, a tightening plate, a roller, a transverse gear, a transverse rack, a transverse spring and a trapezoidal plate, a connecting plate is fixedly connected to the lower part of the hollow correction column, a vertical shaft is rotatably provided between the connecting plate and the hollow correction column, an arc groove plate is fixedly installed in the middle of the vertical shaft, two arc grooves are opened on the arc groove plate, a tightening plate is slidably provided on both sides of the hollow correction column, a roller is fixedly installed on the side where the two tightening plates are close to each other, the two rollers are respectively located in the two arc grooves of the arc groove plate, a transverse gear is installed at the lower part of the vertical shaft, a transverse rack is slidably provided on the lifting frame, a transverse spring is connected between the transverse rack and the lifting frame, the transverse rack is meshed with the transverse gear, a trapezoidal plate is fixedly installed on the side of the groove plate close to the placement groove, an inclined surface is provided on the trapezoidal plate, and the transverse rack contacts the trapezoidal plate.

[0013] The beneficial effects of the present invention are: 1. The stop valve body is pressed by two clamping plates so that the bottom of the stop valve body and the baffle are more closely fitted, thereby correcting the stop valve body. This makes it more convenient and quick to correct, press and clamp the stop valve body, thereby improving the accuracy and efficiency of drilling holes in the stop valve body.

[0014] 2. When the two electric sliders move upward, the lifting frame and the hollow correction column are driven to move upward, and the hollow correction column can be inserted into the circular hole at the lower part of the stop valve body, so that the crooked stop valve body can be corrected, and the position of the stop valve body to be drilled is aligned with the drilling machine, thereby further improving the drilling accuracy of the stop valve body.

[0015] 3. By moving the transverse rack toward the direction close to the transverse gear, the transverse rack drives the transverse gear to rotate, and the transverse gear drives the vertical shaft and the arc slot disk to rotate. The two arc slots on the arc slot disk drive the two rollers and the two tightening plates to move away from each other. The two tightening plates move away from each other to fit more closely with the side walls of the circular hole at the bottom of the stop valve body, further correcting the stop valve body and further fixing the stop valve body, so that the position of the stop valve body to be drilled is further aligned with the drilling machine, further improving the drilling accuracy of the stop valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the drilling machine, slot plate, baffle plate and shell of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the pressing mechanism of the present invention.

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the pressing mechanism and the clamping mechanism of the present invention.

[0020] Figure 5 It is a schematic diagram of the disassembled three-dimensional structure of some parts of the pressing mechanism of the present invention.

[0021] Figure 6 It is a schematic diagram of the disassembled three-dimensional structure of some parts of the clamping mechanism of the present invention.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the pressing mechanism, the clamping mechanism and the correcting mechanism of the present invention.

[0023] Figure 8 It is a schematic diagram of the cross-sectional three-dimensional structure of the clamping mechanism of the present invention.

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of the correction mechanism of the present invention.

[0025] Fig.10 It is a three-dimensional structural schematic diagram of the arc slot disk, the tightening plate and the roller of the present invention.

[0026] Fig.11 It is a three-dimensional structural schematic diagram of the arc slot disk, transverse rack, transverse spring and trapezoidal plate of the present invention.

[0027] Fig.12 It is a schematic diagram of the disassembled three-dimensional structure of some parts of the correction mechanism and the tightening mechanism of the present invention.

[0028] Markings in the accompanying drawings: 1: bracket, 2: drilling machine, 3: groove plate, 4: baffle, 5: shell, 51: stop valve body, 61: slide rail, 62: electric slider, 63: drive frame, 64: press round block, 65: drive groove, 66: ball, 71: rotating shaft, 72: clamping plate, 73: steel ball, 75: column gear, 76: rack rack, 77: slide rod, 78: return spring, 81: lifting frame, 82: hollow correction column, 91: connecting plate, 92: vertical axis, 93: arc groove plate, 94: tightening plate, 95: roller, 96: transverse gear, 97: transverse rack, 98: transverse spring, 99: trapezoidal plate. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0030] Embodiment 1: A clamping device for processing a stop valve, such as Figure 1-Figure 8As shown, it includes a bracket 1, a drilling machine 2, a slot plate 3, a baffle 4, a shell 5, a pressing mechanism and a clamping mechanism. The bracket 1 is provided with a drilling machine 2, and the slot plate 3 is fixedly installed on the bracket 1. A placement slot is opened on one side of the slot plate 3. Two baffles 4 are installed on the side of the slot plate 3 close to the placement slot by bolts, and a shell 5 is installed on the other two sides of the slot plate 3. A stop valve body 51 is placed in the placement slot of the slot plate 3. A pressing mechanism is provided on the slot plate 3 and the shell 5, and the pressing mechanism is used to press the stop valve body 51. A clamping mechanism is provided on the slot plate 3 and the pressing mechanism, and the clamping mechanism is used to clamp the stop valve body 51.

[0031] The upper parts of the two baffles 4 are both provided with rough surfaces.

[0032] The pressing mechanism includes a slide rail 61, an electric slider 62, a drive frame 63, a pressing round block 64 and a ball 66. A slide rail 61 is installed on each side of the two shells 5 close to each other through bolts. An electric slider 62 is slidably provided on each of the two slide rails 61. A drive frame 63 is installed between one side of the two electric sliders 62. The drive frame 63 is slidably connected to the two shells 5. The drive frame 63 will slide up and down along the shells 5. A pressing round block 64 is slidably provided on the groove plate 3. Two driving grooves 65 are opened on one side of the pressing round block 64, and six ball 66 are embedded on the other side of the pressing round block 64.

[0033] The two driving grooves 65 are each composed of an oblique groove and a vertical groove, and the upper portion of the driving frame 63 is located in the oblique grooves of the two driving grooves 65 .

[0034] The clamping mechanism includes a rotating shaft 71, a clamping plate 72, a steel ball 73, a column gear 75, a rack frame 76, a slide rod 77 and a return spring 78. A rotating shaft 71 is rotatably provided in each of the two housings 5. A clamping plate 72 is fixedly installed in the middle of each of the two rotating shafts 71. The upper parts of the two clamping plates 72 pass through the groove plate 3. Four steel balls 73 are evenly spaced and embedded on the sides of the two clamping plates 72 that are close to each other. A column gear 75 is installed on one side of the two rotating shafts 71. Both sides of the groove plate 3 are slidably provided. There is a rack rack 76, and the two rack racks 76 are respectively meshed with two column gears 75. A slide rod 77 is slidably provided on the two rack racks 76, and a flange is provided on the upper end of the two slide rods 77. A return spring 78 is respectively provided between the slide rod 77 on the same side and the rack rack 76 on the same side. One end of the return spring 78 is connected to the slide rod 77, and the other end of the return spring 78 is connected to the rack rack 76. The return spring 78 is wound on the slide rod 77, and the lower ends of the two slide rods 77 are fixedly connected to the upper part of the drive frame 63 by bolts.

[0035] When drilling a hole in the stop valve body 51, the operator places the stop valve body 51 into the placement groove of the groove plate 3. Under the action of gravity, the stop valve body 51 will move downward along the placement groove until the lower part of the stop valve body 51 contacts the upper parts of the two baffles 4, and the stop valve body 51 will stop moving. Then the operator starts the two electric sliders 62 to move upward along the two slide rails 61. The two electric sliders 62 drive the driving frame 63 to move upward. When the driving frame 63 moves along the oblique groove of the driving groove 65, the driving frame 63 drives the pressing round block 64 and the six balls 66 to move in the direction close to the stop valve body 51. After the driving frame 63 moves to the vertical groove of the driving groove 65, the six balls 66 will contact the stop valve body 51. One side contacts, so that the stop valve body 51 can be pressed and fixed, and when the driving frame 63 moves in the vertical groove of the driving groove 65, it will not drive the pressing round block 64 and the six ball bearings 66 to move. After the stop valve body 51 is fixed, the stop valve body 51 will not shake when drilling, thereby improving the drilling accuracy of the stop valve body 51; initially, the flanges of the two sliding rods 77 are in contact with the two rack racks 76, and the upward movement of the driving frame 63 will drive the two sliding rods 77, the two rack racks 76 and the two return springs 78 to move upward, and the upward movement of the two rack racks 76 will drive the two column gears 75 to rotate inwardly, and the two column gears 75 drive the two rotating shafts 71 to rotate inwardly, and the two rotating shafts 71 drive the two clamping plates 72 and the ones thereon The steel balls 73 rotate inwardly, and the two clamping plates 72 press the stop valve body 51. The eight steel balls 73 contact the upper part of the stop valve body 51, so that the bottom of the stop valve body 51 is more closely fitted with the baffle 4, thereby correcting the stop valve body 51. The driving frame 63 continues to move upward to drive the two slide bars 77 to move on the two rack racks 76. The flanges of the two slide bars 77 contact and separate from the two rack racks 76, and the two return springs 78 are compressed accordingly, pressing the stop valve body 51 through the two clamping plates 72, so that the bottom of the stop valve body 51 is more closely fitted with the baffle 4, thereby correcting the stop valve body 51. In this way, the stop valve body 51 can be corrected, pressed and adjusted more conveniently and quickly. Tighten to improve the accuracy and efficiency of drilling holes in the stop valve body 51; the operator starts the drilling machine 2, and the drill bit on the drilling machine 2 can be used to drill holes on the side of the stop valve body 51 that has been corrected, pressed and pressed. After the side of the stop valve body 51 is drilled, the drilling machine 2 is closed, and the operator starts the two electric slides 62 to move downward along the two slide rails 61. The two electric slides 62 drive the driving frame 63 to move downward. When the driving frame 63 moves into the inclined groove of the driving groove 65, the driving frame 63 will drive the pressing round block 64 and the six balls 66 to move away from the stop valve body 51, and the six balls 66 will separate from one side of the stop valve body 51, so that the stop valve body 51 is no longer pressed and fixed;When the driving frame 63 moves downward, under the action of the two return springs 78, the two slide bars 77 will move on the two rack racks 76, and the flanges of the two slide bars 77 will contact the two rack racks 76 again. The two slide bars 77 drive the two rack racks 76 to move downward, and the two rack racks 76 move downward to drive the two column gears 75 to rotate outward, and the two column gears 75 drive the two rotating shafts 71 to rotate outward, and the two rotating shafts 71 drive the two clamping plates 72 and the steel balls 73 thereon to rotate outward, and the two clamping plates 72 will no longer press the stop valve body 51, and then the stop valve body 51 with the drilling completed can be taken out. ;

[0036] Embodiment 2: Based on embodiment 1, Figure 7-Figure 9 As shown, a correction mechanism is also included. The correction mechanism is arranged on two electric sliders 62. The correction mechanism is used to correct the stop valve body 51. The correction mechanism includes a lifting frame 81 and a hollow correction column 82. A lifting frame 81 is fixedly installed between the sides of the two electric sliders 62 that are close to each other by bolts. The lifting frame 81 is slidably connected to the groove plate 3. A hollow correction column 82 is fixedly installed in the middle of the lifting frame 81. The hollow correction column 82 is located directly below the stop valve body 51.

[0037] The upper end of the hollow correction column 82 is configured as an arc surface, and the diameter of the middle portion of the hollow correction column 82 is smaller than the inner diameter of the circular hole at the lower portion of the stop valve body 51 .

[0038] When the two electric sliders 62 move upward, they drive the lifting frame 81 and the hollow correction column 82 to move upward, and the hollow correction column 82 can be inserted into the circular hole at the lower part of the stop valve body 51, so that the crooked stop valve body 51 can be corrected, so that the position of the stop valve body 51 to be drilled is aligned with the drilling machine 2, thereby further improving the drilling accuracy of the stop valve body 51; when the two electric sliders 62 move downward, they drive the lifting frame 81 and the hollow correction column 82 to move downward, and the hollow correction column 82 can be pulled out from the circular hole at the lower part of the stop valve body 51.

[0039] Embodiment 3: Based on embodiment 2, Figure 9-12As shown, it also includes a tightening mechanism, which is arranged on the lifting frame 81, the hollow correction column 82 and the groove plate 3. The tightening mechanism is used to tighten the stop valve body 51. The tightening mechanism includes a connecting plate 91, a vertical shaft 92, an arc groove plate 93, a tightening plate 94, a roller 95, a transverse gear 96, a transverse rack 97, a transverse spring 98 and a trapezoidal plate 99. A connecting plate 91 is fixedly connected to the lower part of the hollow correction column 82. A vertical shaft 92 is rotatably provided between the connecting plate 91 and the hollow correction column 82 through a bearing. An arc groove plate 93 is fixedly installed in the middle of the vertical shaft 92. Two arc grooves are opened on the arc groove plate 93. The two sides of the hollow correction column 82 slide respectively. A tensioning plate 94 is provided, and a roller 95 is fixedly installed on the side where the two tensioning plates 94 are close to each other, and a rubber sheet is provided on the side where the two tensioning plates 94 are away from each other. The two rollers 95 are respectively located in the two arc grooves of the arc groove plate 93, and a transverse gear 96 is installed at the lower part of the vertical shaft 92. A transverse rack 97 is slidably provided on the lifting frame 81, and a transverse spring 98 is connected between the transverse rack 97 and the lifting frame 81. The transverse rack 97 is meshed with the transverse gear 96. A trapezoidal plate 99 is fixedly installed on the side of the slot plate 3 close to the placement slot, and an inclined surface is provided on the trapezoidal plate 99, and the transverse rack 97 is in contact with the trapezoidal plate 99.

[0040] When the lifting frame 81 and the hollow correction column 82 move upward, they will drive the connecting plate 91, the vertical shaft 92, the arc groove plate 93, the tightening plate 94, the roller 95, the transverse gear 96, the transverse rack 97 and the transverse spring 98 to move upward. After the hollow correction column 82 is inserted into the circular hole at the lower part of the stop valve body 51, the transverse rack 97 contacts the inclined surface of the trapezoidal plate 99, and the transverse rack 97 moves in the direction close to the transverse gear 96. The transverse spring 98 is compressed accordingly, and the transverse rack 97 drives the transverse gear 96 to rotate, and the transverse gear 96 drives the vertical shaft 92 and the arc groove plate 93 to rotate. The two arc grooves on the arc groove plate 93 drive the two rollers 95 and the two tightening plates 94 to move away from each other. The two tightening plates 94 move in the direction away from each other so that they can fit more closely with the side wall of the circular hole at the lower part of the stop valve body 51, further correct the stop valve body 51, and at the same time, the stop valve body 51 can be further fixed, so that When the lifting frame 81 and the hollow correction column 82 move downward, the connecting plate 91, the vertical shaft 92, the arc groove plate 93, the tightening plate 94, the roller 95, the transverse gear 96, the transverse rack 97 and the transverse spring 98 will move downward, and the transverse rack 97 will gradually separate from the inclined surface of the trapezoidal plate 99. Under the action of the transverse spring 98, the transverse rack 97 moves in the direction away from the transverse gear 96, and the transverse gear 96 drives the vertical shaft 92 and the arc groove plate 93 to rotate in the opposite direction. The two arc grooves on the arc groove plate 93 drive the two rollers 95 and the two tightening plates 94 to move in a direction close to each other. When the two tightening plates 94 move in a direction close to each other, they will no longer fit the side wall of the circular hole at the lower part of the stop valve body 51, and the hollow correction column 82 will continue to move downward and leave the circular hole at the lower part of the stop valve body 51.

[0041] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A clamping device for stop valve processing, characterized in that: The invention comprises a support (1), a drilling machine (2), a slot plate (3), a baffle plate (4), a shell (5), a pressing mechanism and a clamping mechanism, wherein the support (1) is provided with a drilling machine (2), the slot plate (3) is fixedly mounted on the support (1), a placement slot is opened on one side of the slot plate (3), two baffle plates (4) are mounted on the side of the slot plate (3) close to the placement slot, a shell (5) is mounted on the other two sides of the slot plate (3), a stop valve body (51) is placed in the placement slot of the slot plate (3), the slot plate (3) and the shell (5) are provided with a pressing mechanism, the pressing mechanism is used to press the stop valve body (51), and the slot plate (3) and the pressing mechanism are provided with a clamping mechanism, the clamping mechanism is used to clamp the stop valve body (51); The pressing mechanism comprises a slide rail (61), an electric slider (62), a driving frame (63), a pressing round block (64) and a ball bearing (66). A slide rail (61) is respectively installed on the side close to each other in the two housings (5). An electric slider (62) is slidably installed on each of the two slide rails (61). A driving frame (63) is installed between one side of the two electric sliders (62). The driving frame (63) is slidably connected to the two housings (5). A pressing round block (64) is slidably installed on the groove plate (3). Two driving grooves (65) are opened on one side of the pressing round block (64). A plurality of ball bearings (66) are embedded on the other side of the pressing round block (64). The two driving grooves (65) are composed of an inclined groove and a vertical groove. The upper part of the driving frame (63) is located in the inclined grooves of the two driving grooves (65). The clamping mechanism comprises a rotating shaft (71), a clamping plate (72), a steel ball (73), a column gear (75), a rack frame (76), a slide rod (77) and a return spring (78). A rotating shaft (71) is rotatably provided in each of the two housings (5). A clamping plate (72) is fixedly installed in the middle of each of the two rotating shafts (71). The upper parts of the two clamping plates (72) pass through the groove plate (3). A plurality of steel balls (73) are evenly spaced and embedded in the sides of the two clamping plates (72) close to each other. The two rotating shafts (71) are A column gear (75) is installed on one side of each of the groove plates (3), and a rack frame (76) is slidably provided on both sides of each of the groove plates (3). The two rack frames (76) are respectively meshed with the two column gears (75). A slide bar (77) is slidably provided on each of the two rack frames (76), and a flange is provided on the upper ends of the two slide bars (77). A return spring (78) is provided between the slide bar (77) on the same side and the rack frame (76) on the same side, and the lower ends of the two slide bars (77) are fixedly connected to the upper part of the drive frame (63).

2. A clamping device for stop valve processing according to claim 1, characterized in that: The upper parts of the two baffles (4) are both provided with rough surfaces.

3. A clamping device for stop valve processing according to claim 1, characterized in that: The invention also includes a correction mechanism, which is arranged on the two electric sliders (62) and is used to correct the stop valve body (51). The correction mechanism includes a lifting frame (81) and a hollow correction column (82). A lifting frame (81) is fixedly installed between the two electric sliders (62) on the sides close to each other. A hollow correction column (82) is fixedly installed in the middle of the lifting frame (81). The hollow correction column (82) is located directly below the stop valve body (51).

4. A clamping device for stop valve processing according to claim 3, characterized in that: The upper end of the hollow correction column (82) is arranged to be an arc surface, and the diameter of the middle portion of the hollow correction column (82) is smaller than the inner diameter of the circular hole at the lower portion of the stop valve body (51).

5. A clamping device for stop valve processing according to claim 4, characterized in that: The invention also includes a tightening mechanism, which is arranged on the lifting frame (81), the hollow correction column (82) and the groove plate (3). The tightening mechanism is used to tighten the stop valve body (51). The tightening mechanism includes a connecting plate (91), a vertical shaft (92), an arc groove plate (93), a tightening plate (94), a roller (95), a transverse gear (96), a transverse rack (97), a transverse spring (98) and a trapezoidal plate (99). A connecting plate (91) is fixedly connected to the lower part of the hollow correction column (82). A vertical shaft (92) is rotatably arranged between the connecting plate (91) and the hollow correction column (82). An arc groove plate (93) is fixedly installed in the middle of the vertical shaft (92). The arc groove plate (93) has two arc grooves. The hollow correction column ( A tensioning plate (94) is slidably provided on both sides of the two tensioning plates (94), and a roller (95) is fixedly installed on each side close to each other. The two rollers (95) are respectively located in two arc grooves of the arc groove plate (93). A transverse gear (96) is installed at the lower part of the vertical shaft (92). A transverse rack (97) is slidably provided on the lifting frame (81). A transverse spring (98) is connected between the transverse rack (97) and the lifting frame (81). The transverse rack (97) is meshed with the transverse gear (96). A trapezoidal plate (99) is fixedly installed on the side of the slot plate (3) close to the placement slot. The trapezoidal plate (99) is provided with an inclined surface, and the transverse rack (97) is in contact with the trapezoidal plate (99).

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