CN219465873U - Valve seat clamping tool of double-valve seat mating grinder of hard seal ball valve - Google Patents

Abstract

The utility model provides a valve seat clamping tool of a double-valve seat grinding machine of a hard sealing ball valve, and belongs to the technical field of valve seat clamping of hard sealing ball valves. Including adjusting bolt and adjustable internal stay mechanism, adjustable internal stay mechanism is used for internal stay tight disk seat that expands, adjustable internal stay mechanism includes internal stay tight portion that expands and clamping part, internal stay tight portion is used for stretching into the disk seat hole in order to expand fixed disk seat, the one end that the disk seat was kept away from to internal stay tight portion is located to the clamping part, and supply the centre gripping on the three-jaw chuck, threaded hole has been seted up along self radially to the clamping part, adjusting bolt threaded connection is in the threaded hole on the clamping part, and adjusting bolt is when screwing up the action, internal stay tight portion expands tightly the disk seat in, set up this anchor clamps and avoid when using two disk seat to join in marriage the mill to carry out the centre gripping to the disk seat on the ball valve with three-jaw chuck, the disk seat on the ball valve takes place the deformation in the centre gripping in-process, the later stage of being convenient for use two disk seat to join in marriage the mill to grind the ball valve.

Description

Valve seat clamping tool of double-valve seat mating grinder of hard seal ball valve

Technical Field

The utility model relates to the technical field of clamping of valve seats of hard sealing ball valves, in particular to a valve seat clamping tool of a double-valve-seat match-grinding machine of a hard sealing ball valve.

Background

The valve is an important branch with unique functions in general mechanical products in China, plays an important role in controlling the necessary flow of working medium in a wide liquid engineering pipeline, and in order to ensure the precision of the valve in the production process, the valve is ground by using a double-valve-seat grinding machine, wherein a valve seat for grinding is fixed on the double-valve-seat grinding machine by using a three-jaw chuck.

The existing three-jaw chuck for the double-valve-seat grinding machine has certain defects when in use, because of the particularity of the hard sealing ball valve, the valve seat on the hard sealing ball valve is very thin, the valve seat on the hard sealing ball valve is clamped by the three-jaw chuck for the double-valve-seat grinding machine, so that the valve seat on the hard sealing ball valve cannot be clamped stably by the three-jaw chuck for the double-valve-seat grinding machine, and then the valve seat on the double-valve-seat grinding machine is easy to loose and fall off, so that the hard sealing ball valve is inconvenient to grind by the double-valve-seat grinding machine in later period.

Disclosure of Invention

In view of the problems, the utility model provides the valve seat clamping tool of the double-valve seat mating and grinding machine for the hard sealing ball valve, which can avoid the condition that the valve seat on the hard sealing ball valve is deformed in the clamping process when the three-jaw chuck for the double-valve seat mating and grinding machine is used for clamping the valve seat on the hard sealing ball valve, and is convenient for later grinding of the hard sealing ball valve by using the double-valve seat mating and grinding machine.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a two disk seat of hard seal ball valve match mill disk seat clamping instrument, including adjusting bolt and adjustable internal stay mechanism, adjustable internal stay mechanism is used for internal stay tight disk seat that expands, adjustable internal stay mechanism includes internal stay tight portion and clamping part that expands, internal stay tight portion is used for stretching into the disk seat hole in order to expand fixed disk seat, the clamping part is located internal stay tight portion that expands and is kept away from the one end of disk seat, and supply the centre gripping on the three-jaw chuck, threaded hole has been seted up along self radially to the clamping part, adjusting bolt threaded connection in the threaded hole on the clamping part, and adjusting bolt is when screwing up the action, internal stay tight portion that expands in to the disk seat, internal stay tight portion that expands includes a plurality of internal stays, a plurality of internal stays are close to the circumference evenly arranged of clamping part, and internal stay and clamping part fixed connection.

Further, one end of the inner stays close to the clamping part encloses and closes to form a conical expansion hole, the diameter of one end of the conical expansion hole far away from the clamping part is larger than the diameter of the threaded hole, the adjusting bolt penetrates through the expansion hole and is in threaded connection with the threaded hole, when the adjusting bolt is screwed down, the outer wall of the adjusting bolt is expanded and expanded in the expansion hole when being in contact with the inner wall of the expansion hole, and the inner stays are expanded and expanded in the valve seat.

Further, one end of the adjusting bolt, which is far away from the clamping part, is provided with a conical part for expanding the expansion hole, the diameter of the conical part is larger than that of one end of the expansion hole, which is far away from the clamping part, and the outer wall of the conical part is in contact with the inner wall of the expansion hole.

Further, a positioning concave table for installing a valve seat is arranged at the edge of the front end of the inner supporting and expanding part, and one end of the valve seat, which is far away from the ball valve, is installed on the positioning concave table.

Further, two positioning concave tables are arranged, the two positioning concave tables are arranged at the front end edge of the inner supporting expansion part at intervals, and the two positioning concave tables are respectively used for installing valve seats with different sizes.

Further, be equipped with anti-skidding mechanism on the adjusting bolt, anti-skidding mechanism includes the gag lever post, the fixed block, movable rod and anti-skidding portion, the gag lever post is along adjusting bolt's length direction threaded connection on adjusting bolt, the fixed block sets firmly in the one end that the gag lever post is close to the clamping part, and the fixed block is the round platform structure, the both sides face of fixed block all is equipped with the spacing groove along the width direction of gag lever post, one side that the fixed block was kept away from to the spacing groove is equipped with the opening that runs through adjusting bolt outer wall, the movable rod is inserted along the depth direction of spacing groove and is located the spacing inslot, the one end and the outer wall contact of fixed block of movable rod, the other end and the anti-skidding portion contact of movable rod, the limiting inslot is located in the anti-skidding portion is slided, and the anti-skidding portion is used for contradicting with the screw hole inner wall.

Further, the anti-skidding portion comprises a first spring, a sliding block, a top block and a rubber pad, wherein the top block is arranged in the limiting groove in a sliding mode, one side face of the top block is abutted against the movable rod, the rubber pad is arranged on one side face of the top block away from the movable rod, the bottom of the limiting groove is penetrated and provided with a groove, the sliding block is arranged in the groove along the vertical direction, one end of the sliding block is fixedly connected with the top block, the first spring is arranged in the groove, one end of the first spring is fixedly connected with the sliding block, the other end of the first spring is fixedly connected with the inner wall of the groove, and the first spring is used for driving the rubber pad on the top block to extend out of the limiting groove and abutted against the threaded hole.

Further, still be equipped with the positioning mechanism who is used for carrying out the location to adjusting bolt on the internal stay tight portion that expands, positioning mechanism includes the bracing piece, the second spring, sleeve and locating piece, the bracing piece is equipped with two, and the one end threaded connection of bracing piece is located on the internal stay tight portion that expands, the sleeve is located to the other pot head of bracing piece, in the sleeve is located to the second spring, and the both ends of second spring respectively with the one end fixed connection of homonymy bracing piece, the second spring is used for driving the bracing piece to extend to the outside, the locating piece is located on the telescopic outer wall, and towards adjusting bolt, adjusting bolt is hexagon socket head cap screw, hexagon hole looks adaptation on locating piece and the hexagon head cap screw, and the locating piece is kept away from telescopic one end and is inserted in the hexagon hole.

The embodiment of the application provides a two disk seat of hard seal ball valve match mill disk seat clamping instrument, including adjusting bolt and adjustable internal stay mechanism, adjustable internal stay mechanism is used for internal stay tight disk seat that expands, adjustable internal stay mechanism includes internal stay tight portion and clamping part that expands, internal stay tight portion is used for stretching into the disk seat hole in order to expand fixed disk seat, the clamping part is located internal stay tight portion and is kept away from the one end of disk seat, and supply the centre gripping on the three-jaw chuck, threaded hole is offered along self radially to the clamping part, adjusting bolt threaded connection threaded hole on the clamping part, and adjusting bolt is when screwing up the action, internal stay tight portion is internal stay tight to the disk seat that expands, internal stay tight portion includes a plurality of internal stays, a plurality of internal stays are close to the one end of clamping part along the circumference evenly arranged of clamping part, and internal stay and clamping part fixed connection.

The beneficial effects of the utility model are as follows:

1. through installing the disk seat in the interior tight portion that expands, utilize the three-jaw chuck on the mill of two disk seats to carry out the centre gripping to the clamping part, with adjusting bolt threaded connection in the screw hole on the clamping part, make interior tight portion that expands carry out the internal stay tight of expanding through screwing up adjusting bolt to realize the tight of expanding to the disk seat, avoid directly using the three-jaw chuck to carry out the centre gripping to the disk seat and lead to the disk seat to take place the circumstances of deformation.

2. Through setting up into a plurality of inner stays with interior expanding portion for the pressure that bears on the disk seat unit area is little, and the atress is even, has avoided the disk seat to press from both sides by three-jaw chuck and has warp, and the later stage of being convenient for uses two disk seat to join in marriage the mill and grind hard seal ball valve.

3. Through set up a plurality of positioning concave stations on the internal stay tight portion that expands, select the positioning concave station of adaptation with it according to the size of disk seat to install the disk seat on the positioning concave station, thereby make the device can be applicable to not unidimensional disk seat, improve the utilization ratio of device.

Drawings

Fig. 1 is a schematic diagram of the overall cross-sectional structure of a valve seat clamping tool of a double-valve seat mating grinder for a hard seal ball valve in embodiment 1 of the application.

Fig. 2 is a schematic cross-sectional view of the adjustable internal support mechanism of embodiment 1 of the present application.

Fig. 3 is a schematic top view of a valve seat clamping tool of a double-valve seat mating grinder for a hard seal ball valve in embodiment 1 of the application.

Fig. 4 is a schematic structural view of the inner expanding portion in embodiment 1 of the present application.

Fig. 5 is a schematic sectional view of an adjusting bolt according to embodiment 2 of the present application.

Fig. 6 is an enlarged partial schematic view of the portion a in fig. 5.

Fig. 7 is a schematic diagram of an installation structure of the inner supporting and expanding portion and the positioning mechanism in embodiment 3 of the present application.

Wherein, 1, a ball valve; 2. a valve seat; 3. an adjusting bolt; 31. a conical portion; 4. an adjustable internal support mechanism; 41. an inner support expansion part; 411. an inner stay; 42. a clamping part; 421. a threaded hole; 5. positioning concave table; 6. expanding the hole; 7. an anti-slip mechanism; 71. a limit rod; 72. a fixed block; 73. a movable rod; 74. an anti-slip part; 741. a first spring; 742. a slide block; 743. a top block; 744. a rubber pad; 75. a limit groove; 8. a groove; 9. a positioning mechanism; 91. a support rod; 92. a second spring; 93. a sleeve; 94. and (5) positioning blocks.

Detailed Description

In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.

Example 1

The embodiment of the application discloses two disk seat of hard seal ball valve match mill disk seat clamping instrument, refer to fig. 1 and 2, including adjusting bolt 3 and adjustable internal stay mechanism 4, adjustable internal stay mechanism 4 is used for internal stay tight disk seat 2 that expands, adjustable internal stay mechanism 4 includes internal stay tight part 41 and clamping part 42, internal stay tight part 41 is used for stretching into disk seat 2 hole in order to expand fixed disk seat 2, clamping part 42 locates the one end that internal stay tight part 41 kept away from disk seat 2, and supply the centre gripping on the three-jaw chuck, threaded hole 421 has been seted up along the radial of self to clamping part 42, adjusting bolt 3 threaded connection is in threaded hole 421 on clamping part 42, and adjusting bolt 3 when screwing up the action, internal stay tight part 41 is expanded in to disk seat 2, internal stay tight part 41 includes a plurality of internal stay 411, a plurality of internal stay 411 are close to the one end of clamping part 42 along the circumference of clamping part 42 evenly arranged, and internal stay 411 and clamping part 42 fixed connection.

Wherein, through with the clamping part 42 centre gripping on the three-jaw chuck on the mill is joined in marriage to the double valve seat, install disk seat 2 again on interior expansion portion 41, again with adjusting bolt 3 threaded connection in the screw hole 421 on the clamping part 42, make interior expansion portion 41 expand through screwing up adjusting bolt 3, thereby realize the expansion to disk seat 2, utilize the cooperation of interior expansion portion 41 and clamping part 42, fix disk seat 2 on the mill is joined in marriage to the double valve seat, install ball valve 1 on disk seat 2 again and use double valve seat to join in marriage the mill and carry out relevant grinding operation to ball valve 1. The valve seat is prevented from being clamped and deformed by the three-jaw chuck, and the hard sealing ball valve is convenient to grind by using the double-valve seat matched grinding machine in the later period.

In addition, by providing the inner stay expansion portion 41 as a plurality of inner stays 411, the pressure born by the valve seat 2 per unit area is small and the stress is uniform, and the valve seat 2 is prevented from being deformed by the three-jaw chuck.

In this embodiment, referring to fig. 2 and 3, one end of the plurality of inner stays 411, which is close to the clamping portion 42, encloses to form a tapered expansion hole 6, a diameter of one end of the tapered expansion hole 6, which is far away from the clamping portion 42, is larger than a diameter of the threaded hole 421, the adjusting bolt 3 passes through the expansion hole 6 and is screwed into the threaded hole 421, when the adjusting bolt 3 performs screwing action, the outer wall of the adjusting bolt 3 performs inner bracing and expansion of the expansion hole 6 when contacting with the inner wall of the expansion hole 6, and the plurality of inner stays 411 perform inner bracing and expansion of the valve seat 2.

Wherein, the adjusting bolt 3 passes through the expansion hole 6 formed by the enclosing of the inner stay 411 and then is in threaded connection with the threaded hole 421 on the clamping part 42, and the diameter sizes of two ends of the expansion hole 6 are different due to the fact that the expansion hole 6 is a conical expansion hole 6, and the expansion hole 6 is expanded by tightening the adjusting bolt 3 so that the outer wall of the adjusting bolt 3 contacts with the inner wall of the expansion hole 6. When the expansion hole 6 expands, the inner stay 411 correspondingly expands outwards, so that the valve seat 2 is expanded. The pressure born by the unit area of the valve seat 2 is small by the aid of the inner stays 411, the pressure is uniform, and the valve seat 2 is prevented from being clamped and deformed by the three-jaw chuck.

In this embodiment, the end of the adjusting bolt 3 away from the clamping portion 42 is formed with a conical portion 31 for expanding the expansion hole 6, the diameter of the conical portion 31 is larger than the diameter of the end of the expansion hole 6 away from the clamping portion 42, the outer wall of the conical portion 31 abuts against the inner wall of the expansion hole 6, one end of the adjusting bolt 3 is arranged as the conical portion 31, so that the diameter sizes of the two ends of the adjusting bolt 3 are different, and the diameter size of one end of the conical portion 31 is the largest. When the adjusting bolt 3 is tightened, the expansion hole 6 is expanded by moving the conical portion 31 in the screw direction of the screw hole 421 in the clamp portion 42.

In this embodiment, the front end border department of interior expansion portion 41 is equipped with the location concave station 5 that is used for installing disk seat 2, and the one end that disk seat 2 kept away from ball valve 1 is installed on location concave station 5, through setting up location concave station 5 in interior expansion portion 41, is convenient for install disk seat 2 in interior expansion portion 41, realizes fixing disk seat 2.

In other embodiments, referring to fig. 4, two positioning concave tables 5 are provided, two positioning concave tables 5 are arranged at the front end edge of the inner supporting expansion part 41 at intervals, the two positioning concave tables 5 are respectively used for installing the valve seats 2 with different sizes, and a plurality of positioning concave tables 5 are arranged to install the valve seats 2 with different sizes, so that the device can be suitable for the valve seats 2 with different sizes, and the utilization rate of the device is improved.

The implementation principle of the valve seat clamping tool of the double-valve seat mating and grinding machine of the hard sealing ball valve is as follows: the clamping portion 42 is clamped on a three-jaw chuck of the double-valve-seat grinder, and the valve seat 2 is mounted on the plurality of inner stays 411 by the positioning concave table 5, so that the valve seat 2 is fixed. The adjusting bolt 3 passes through the expansion hole 6 formed by encircling the inner stay 411 and then is in threaded connection with the threaded hole 421 on the clamping part 42, when the adjusting bolt 3 is in screwing action, the outer wall of the adjusting bolt 3 is in inner supporting and expanding with the expansion hole 6 when in contact with the inner wall of the expansion hole 6, and the inner stays 411 are used for expanding the valve seat 2 in an inner supporting and expanding mode, so that the valve seat 2 is in an expanding state, the pressure born by the unit area of the valve seat 2 is small by utilizing the inner stays 411, the stress is uniform, the valve seat 2 is prevented from being clamped and deformed by the three-jaw chuck, and the hard sealing ball valve is convenient to grind by using the double-valve seat matched grinding machine in the later period.

In the case of example 2,

referring to fig. 1 and 5, embodiment 1 differs from embodiment 2 in that an anti-slip mechanism 7 is provided on the adjusting bolt 3, and the adjusting bolt 3 has an anti-slip function.

In this embodiment, referring to fig. 5, the adjusting bolt 3 is provided with the anti-slip mechanism 7, the anti-slip mechanism 7 includes a limit rod 71, a fixed block 72, a movable rod 73 and an anti-slip part 74, the limit rod 71 is connected to the adjusting bolt 3 along the length direction of the adjusting bolt 3 in a threaded manner, the fixed block 72 is fixedly arranged at one end of the limit rod 71 close to the clamping part 42, the fixed block 72 is in a circular truncated cone structure, both sides of the fixed block 72 are provided with limit grooves 75 along the width direction of the limit rod 71, one side of the limit groove 75 away from the fixed block 72 is provided with an opening penetrating through the outer wall of the adjusting bolt 3, the movable rod 73 is inserted into the limit groove 75 along the depth direction of the limit groove 75, one end of the movable rod 73 is in contact with the outer wall of the fixed block 72, the other end of the movable rod 73 is in contact with the anti-slip part 74, the anti-slip part 74 is slidingly arranged in the limit groove 75, and the anti-slip part 74 is used for abutting against the inner wall of the threaded hole 421.

Wherein, through twisting the gag lever post 71 makes the fixed block 72 take place corresponding removal upwards or downwards, when the fixed block 72 moves down, promotes movable rod 73 to move to the outside, and when movable rod 73 moved, the anti-skidding portion 74 followed the direction of movement of movable rod 73 and carried out corresponding removal, until anti-skidding portion 74 part stretches out adjusting bolt 3's outer wall. The anti-slip portion 74 interferes with the inner wall of the screw hole 421 to provide an anti-slip effect on the adjusting bolt 3, thereby reducing the occurrence of sliding of the adjusting bolt 3 in the screw hole 421. Thereby avoiding the sliding of the adjusting bolt 3 in the use process, leading to the corresponding change of the inner stay 411, and changing the expansion effect of the inner stay 411 on the valve seat 2. When the limit lever 41 is unscrewed, the fixed block 72 moves upward, at this time, the movable lever 73 moves inward, and when the movable lever 73 moves, the anti-slip part 74 moves correspondingly along with the moving direction of the movable lever 73, so that the anti-slip part 74 moves into the limit groove 75, the interference of the anti-slip part 74 to the inner wall of the threaded hole 421 is canceled, and the adjusting bolt 3 is detached from the clamping part 42 at a later stage.

The adjusting bolt 3 is a hexagon socket head cap bolt, a mounting groove is formed in the lower portion of the hexagon socket head cap bolt head portion in a penetrating manner, and the limit rod 71 is inserted into the mounting groove, so that the limit rod 71 is in threaded connection with the adjusting bolt 3.

In this embodiment, referring to fig. 6, the anti-sliding portion 74 includes a first spring 741, a slider 742, a top block 743 and a rubber pad 744, the top block 743 is slidably disposed in the limiting slot 75, and a side surface of the top block 743 abuts against the movable rod 73, the rubber pad 744 is disposed on a side surface of the top block 743 away from the movable rod 73, the bottom of the limiting slot 75 is perforated with a groove 8, the slider 742 is disposed in the groove 8 along the vertical direction, one end of the slider 742 is fixedly connected with the top block 743, the first spring 741 is disposed in the groove 8, one end of the first spring 741 is fixedly connected with the slider 742, the other end is fixedly connected with the inner wall of the groove 8, and the first spring 741 is used for driving the rubber pad 744 on the top block 743 to extend out of the limiting slot 75 and abut against the threaded hole 421.

Wherein, through setting up recess 8, when movable rod 73 takes place to remove, under the elasticity effect of first spring 741, slider 742 takes place to remove correspondingly along the direction of movement of movable rod 73, and then drives kicking block 743 and slide in spacing groove 75 along the direction of movement of slider 742, realizes that rubber pad 744 stretches out or withdraws to spacing groove 75, utilizes rubber pad 744 to contradict the inner wall of screw hole 421, plays skid-proof effect to adjusting bolt 3, reduces adjusting bolt 3 and takes place gliding condition in screw hole 421.

Example 3

Referring to fig. 5 and 7, embodiment 2 differs from embodiment 3 in that a positioning mechanism 9 is provided on the adjusting bolt 3 to perform a positioning function on the adjusting bolt 3.

In this embodiment, referring to fig. 7, the inner supporting expansion part 41 is further provided with a positioning mechanism 9 for positioning the adjusting bolt 3, the positioning mechanism 9 includes a supporting rod 91, a second spring 92, a sleeve 93 and a positioning block 94, the supporting rod 91 is provided with two parts, one end of the supporting rod 91 is in threaded connection with the inner supporting expansion part 41, the other end of the supporting rod 91 is sleeved in the sleeve 93, the second spring 92 is arranged in the sleeve 93, two ends of the second spring 92 are respectively fixedly connected with one end of the same side supporting rod 91, the second spring 92 is used for driving the supporting rod 91 to extend outwards, the positioning block 94 is arranged on the outer wall of the sleeve 93 and faces the adjusting bolt 3, the adjusting bolt 3 is a hexagon socket head cap bolt, the positioning block 94 is matched with a hexagon inner hole on the head of the hexagon socket head cap bolt, and one end of the positioning block 94, which is far away from the sleeve 93, is inserted in the hexagon inner hole.

Wherein, by installing the positioning block 94 in the hexagonal inner hole on the head of the hexagon socket head cap screw, since the second spring 92 and one ends of the two supporting rods 91 are both located in the sleeve 93, the interval between the two supporting rods 91 is changed by the elastic force of the second spring 92. Because be equipped with the screw thread on the outer wall that bracing piece 91 is close to interior expansion portion 41 one end, through using the bolt to fix bracing piece 91 in on the expansion portion 41 of propping to make locating piece 94 firm install on adjusting bolt 3, realize the location to adjusting bolt 3, reduce adjusting bolt 3 and take place gliding condition in screw hole 421.

It will be apparent to those skilled in the art that while preferred embodiments of the present utility model have been described, additional variations and modifications may be made to these embodiments once the basic inventive concepts are known to those skilled in the art. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model. It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (8)

1. The utility model provides a hard seal ball valve double valve seat match mill disk seat clamping instrument, its characterized in that includes adjusting bolt (3) and adjustable internal stay mechanism (4), adjustable internal stay mechanism (4) are used for internal stay tight disk seat (2), adjustable internal stay mechanism (4) include internal stay tight part (41) and clamping part (42), internal stay tight part (41) are used for stretching into disk seat (2) hole in order to expand fixed disk seat (2), clamping part (42) locate internal stay tight part (41) and keep away from one end of disk seat (2) to supply the centre gripping on the three-jaw chuck, threaded hole (421) have been seted up along self radial to clamping part (42), adjusting bolt (3) threaded connection is in threaded hole (421) on clamping part (42), and adjusting bolt (3) when screwing up the action, internal stay tight part (41) carries out internal stay tight to disk seat (2);

the inner supporting and expanding part (41) comprises a plurality of inner supporting strips (411), one ends of the inner supporting strips (411) close to the clamping part (42) are uniformly arranged along the circumferential direction of the clamping part (42), and the inner supporting strips (411) are fixedly connected with the clamping part (42).

2. The valve seat clamping tool of the double-valve-seat mating grinding machine for the hard sealing ball valve according to claim 1, wherein one end, close to the clamping part (42), of the inner stay (411) is enclosed to form a conical expansion hole (6), the diameter of one end, far away from the clamping part (42), of the conical expansion hole (6) is larger than that of the threaded hole (421), the adjusting bolt (3) penetrates through the expansion hole (6) and is in threaded connection with the threaded hole (421), and when the adjusting bolt (3) performs screwing action, the outer wall of the adjusting bolt (3) performs inner stay and expansion on the expansion hole (6) when being in contact with the inner wall of the expansion hole (6), and the inner stays (411) perform inner stay expansion on the valve seat (2).

3. The valve seat clamping tool of the double-valve-seat mating grinding machine for the hard sealing ball valve according to claim 2, wherein one end, far away from the clamping part (42), of the adjusting bolt (3) is provided with a conical part (31) for expanding the expansion hole (6), the diameter of the conical part (31) is larger than that of one end, far away from the clamping part (42), of the expansion hole (6), and the outer wall of the conical part (31) is in contact with the inner wall of the expansion hole (6).

4. The clamping tool for the valve seat of the double-valve-seat mating grinder for the hard sealing ball valve according to claim 1, wherein a positioning concave table (5) for installing the valve seat (2) is arranged at the front end edge of the inner supporting expansion part (41), and one end, far away from the ball valve (1), of the valve seat (2) is installed on the positioning concave table (5).

5. The clamping tool for the valve seat of the double-valve-seat mating grinding machine of the hard sealing ball valve according to claim 4, wherein two positioning concave tables (5) are arranged, the two positioning concave tables (5) are arranged at the front end edge of the inner supporting expansion part (41) at intervals, and the two positioning concave tables (5) are respectively used for installing valve seats (2) with different sizes.

6. The hard seal ball valve double-valve seat grinding machine valve seat clamping tool according to claim 1, characterized in that the adjusting bolt (3) is provided with an anti-slip mechanism (7), the anti-slip mechanism (7) comprises a limiting rod (71), a fixed block (72), a movable rod (73) and an anti-slip part (74), the limiting rod (71) is connected to the adjusting bolt (3) along the length direction of the adjusting bolt (3) in a threaded manner, the fixed block (72) is fixedly arranged at one end, close to the clamping part (42), of the limiting rod (71), the fixed block (72) is in a circular truncated cone structure, both side surfaces of the fixed block (72) are provided with limiting grooves (75) along the width direction of the limiting rod (71), one side, far away from the fixed block (72), of the limiting groove (75) is provided with an opening penetrating through the outer wall of the adjusting bolt (3), one end of the movable rod (73) is in contact with the outer wall of the fixed block (72) along the depth direction of the limiting groove (75), the other end of the movable rod (73) is in contact with the outer wall of the fixed block (72), and the other end of the movable rod (73) is in contact with the anti-slip part (74) and is in contact with the anti-slip part (421) and is in the anti-slip part (74).

7. The valve seat clamping tool of the double-valve-seat mating grinding machine for the hard sealing ball valve according to claim 6, wherein the anti-slip part (74) comprises a first spring (741), a sliding block (742), a jacking block (743) and a rubber gasket (744), the jacking block (743) is slidably arranged in the limit groove (75), one side surface of the jacking block (743) is abutted against the movable rod (73), the rubber gasket (744) is arranged on one side surface of the jacking block (743) far away from the movable rod (73), a groove (8) is formed in the bottom of the limit groove (75) in a penetrating mode, the sliding block (742) is arranged in the groove (8) in the vertical direction, one end of the sliding block (742) is fixedly connected with the jacking block (743), one end of the first spring (741) is fixedly connected with the sliding block (742), the other end of the first spring (741) is fixedly connected with the inner wall of the groove (8), and the rubber gasket (744) on the jacking block (743) is used for driving the jacking block (744) to extend out of the limit groove (75) and abutted against the threaded hole (421).

8. The hard sealing ball valve double-valve seat mating grinding machine valve seat clamping tool according to claim 1, characterized in that a positioning mechanism (9) for positioning the adjusting bolt (3) is further arranged on the inner supporting expansion part (41), the positioning mechanism (9) comprises a supporting rod (91), a second spring (92), a sleeve (93) and a positioning block (94), the supporting rod (91) is provided with two supporting rods, one end of the supporting rod (91) is in threaded connection with the inner supporting expansion part (41), the other end of the supporting rod (91) is sleeved in the sleeve (93), the second spring (92) is arranged in the sleeve (93), two ends of the second spring (92) are fixedly connected with one end of the supporting rod (91) on the same side respectively, the second spring (92) is used for driving the supporting rod (91) to extend outwards, the positioning block (94) is arranged on the outer wall of the sleeve (93) and faces the adjusting bolt (3), the adjusting bolt (3) is a hexagon socket head, the positioning block (94) is in a hexagon socket head, and the other end of the positioning block (94) is in a hexagon socket head, and the socket head is far away from the socket head.