CN212399215U

CN212399215U - Grinding machine for three-eccentric butterfly valve

Info

Publication number: CN212399215U
Application number: CN202022181550.1U
Authority: CN
Inventors: 黄汉敏; 王在新; 王文化; 温耀信
Original assignee: Zhongshan Kingdom Flow Control Co ltd
Current assignee: Zhongshan Kingdom Flow Control Co ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-01-26
Anticipated expiration: 2030-09-28

Abstract

The utility model discloses a grind machine for three eccentric butterfly valves, include: a frame; the supporting piece is rotatably arranged on the rack, and a clamping module used for clamping a workpiece is arranged on the supporting piece; the driving mechanism is in transmission connection with the bearing piece; the grinding device is arranged on the rack and comprises a grinding piece arranged in a sliding mode, the grinding piece is matched with the clamping module to grind the workpiece, and the grinding piece can be kept in a fit state with the workpiece during grinding. Through being provided with grinder, the grinding piece that sets up through sliding removes and makes grinding piece keep being in laminating grinding state with the work piece when the supporting piece rotates, and simple structure and reasonable compare with prior art, have replaced artifical grinding, can grind automatically, reduce working strength, and it is higher to improve work efficiency, and the planarization and the continuity of the oval sealed face after the work piece grinds are better, have improved finished product quality.

Description

Grinding machine for three-eccentric butterfly valve

Technical Field

The utility model relates to a grinding device technical field, in particular to a grind machine for three eccentric butterfly valves.

Background

Due to the structural particularity of the valve seat and the sealing ring of the triple eccentric butterfly valve, the roughness of the oval sealing surface of the valve seat and the roughness of the oval sealing surface of the sealing ring which are produced preliminarily are large, and the valve seat and the sealing ring need to be ground so as to be assembled. Conventionally, the elliptical seal surfaces of the valve seat and the seal ring are repeatedly ground by a grinding tool manually. However, the manual grinding mode is adopted, the working efficiency is low, the continuity and the smoothness of the oval sealing surfaces of the ground valve seat and the ground sealing ring are poor, and the quality of a finished product is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a grind machine for three eccentric butterfly valves, grind machine simple structure, work efficiency is higher, improves finished product quality.

According to the utility model discloses a grind machine for three eccentric butterfly valves, include: a frame; the supporting piece is rotatably arranged on the rack, and a clamping module used for clamping a workpiece is arranged on the supporting piece; the driving mechanism is in transmission connection with the bearing piece; the grinding device is arranged on the rack and comprises a grinding piece arranged in a sliding mode, the grinding piece is matched with the clamping module to grind the workpiece, and the grinding piece can be kept in a fit state with the workpiece during grinding.

According to the utility model discloses a grind machine for three eccentric butterfly valves has following beneficial effect at least: through being provided with grinder, the grinding piece that sets up through sliding removes and makes grinding piece keep being in laminating grinding state with the work piece when the supporting piece rotates, and simple structure and reasonable compare with prior art, have replaced artifical grinding, can grind automatically, reduce working strength, and it is higher to improve work efficiency, and the planarization and the continuity of the oval sealed face after the work piece grinds are better, have improved finished product quality.

According to some embodiments of the present invention, the grinding device comprises an elastic member and a connection structure, the connection structure has one end connected to the frame, the grinding member is slidably disposed at the other end of the connection structure, and the elastic member is disposed between the grinding member and the connection structure. The elastic part can push the grinding part to be better attached to the elliptical sealing surface of the workpiece, changes along with the curvature change of the sealing surface of the workpiece, realizes automatic attachment and flexible contact, and is simple in structure and convenient and fast to install.

According to some embodiments of the invention, the grinding member comprises a grinding portion, a sliding portion and a limiting portion connected in sequence; the connecting structure comprises an installation seat and a fixing part, one end of the installation seat is connected to the rack, the fixing part is connected to one end of the installation seat, the sliding part is slidably connected to the fixing part, the grinding part is located on one side of the fixing part, the limiting part is located on the other side of the fixing part and can limit the grinding part to be separated from the fixing part, the elastic part is arranged between the grinding part and the fixing part, and the elastic part can always push the grinding part to be always attached to the oval sealing surface of the workpiece. By adopting the structure, when the bearing piece drives the workpiece to rotate, the elastic piece can push the grinding part to be better attached to the elliptical sealing surface of the workpiece, the elastic piece changes along with the curvature change of the sealing surface of the workpiece, automatic attachment and flexible contact are realized, and the structure is simple and convenient to install.

According to some embodiments of the invention, the mount pad slidably set up in the frame, just the mount pad with be provided with between the frame and be used for restricting the locking Assembly of mount pad shift position. Through being provided with this locking Assembly, can be according to the sealed face aperture size of ellipse of work piece, and then adjust this connection structure's mounted position, adjust convenient and nimble setting.

According to some embodiments of the present invention, the mounting base is provided with a first through hole, and the frame is provided with a second through hole corresponding to the first through hole; the locking assembly comprises a first threaded piece and a first nut, wherein the first threaded piece penetrates through the first through hole and the second through hole and is in threaded connection with the first nut. Through loosening first nut soon, the relative frame of mount pad removes, when the mount pad removes to preset position, screws up first nut to the relative position of fixed mounting seat and frame, it is convenient to adjust, easy dismounting, and simple structure is reasonable.

According to some embodiments of the present invention, a grinding station is disposed on each of two sides of the frame; the number of the clamping modules is two, the two groups of the clamping modules are respectively positioned at two sides of the supporting piece, one group of the clamping modules corresponds to one grinding station, and the other group of the clamping modules corresponds to the other grinding station; the grinding devices are arranged in two groups, and the two groups of grinding devices are respectively arranged at the two grinding stations. Set up two and grind the station, structural design is reasonable, has improved production efficiency greatly, has reduced the labour, saves manufacturing cost.

According to some embodiments of the utility model, the supporting piece include the rotation portion and with two installation departments of rotation portion fixed connection, the rotation portion rotationally set up in the frame, two the installation department is located respectively the both ends of rotation portion, the rotation portion with the actuating mechanism transmission is connected, two installation department and two the centre gripping module one-to-one is arranged. Simple structure, and drive the rotation portion through actuating mechanism and rotate, drive the installation department then and rotate, the transmission is stable, and the installation is reliable.

According to some embodiments of the present invention, the clamping module comprises a plurality of groups of clamping structures, the clamping structures being provided with clamping spaces for clamping the workpiece; two in the grinding station, one of them grinder grind the piece dorsad the center setting of rotation portion, another grinder orientation the center setting of rotation portion has realized that disk seat and sealing washer grind simultaneously, and structural design is reasonable, has improved improvement work efficiency greatly, has reduced the labour, saves manufacturing cost.

According to some embodiments of the utility model, clamping structure includes second screw, position sleeve, gasket and second nut, be provided with the spout on the installation department, second screw includes the head and has the screwed pole portion, the head slide set up in the spout, just pole portion along the spout stretches out to the outside, the position sleeve with the gasket all overlaps and locates on the pole portion, the position sleeve butt in the installation department, the second nut spiro union in pole portion and butt in the gasket, the centre gripping space set up in the gasket with between the position sleeve. By adopting the structure, the head part of the second threaded part can be movably arranged relative to the sliding groove, so that the workpiece valve seats and the sealing rings with different sizes can be fixed, and the application range is wide.

According to some embodiments of the utility model, actuating mechanism includes driving motor, first band pulley, second band pulley and hold-in range, driving motor fixed set up in the frame, first band pulley fixed connection in driving motor's pivot, the second band pulley with holding piece fixed connection, first band pulley with the second band pulley passes through hold-in range transmission connects. The first belt wheel is driven to rotate through the driving motor, the synchronous belt rotates, then the second belt wheel is driven to drive the bearing piece to rotate, and the synchronous belt type bearing device is simple in structure, reliable and stable in transmission and convenient and fast to install.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a first perspective structure of a grinder according to an embodiment of the present invention;

fig. 2 is a schematic view of a second perspective structure of the grinder according to the embodiment of the present invention;

fig. 3 is an exploded schematic view of a grinder according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a polishing apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a clamping structure according to an embodiment of the present invention.

Reference numerals:

the frame 10, the second through hole 11, the supporting piece 20, the rotating part 21, the mounting part 22 and the sliding groove 221;

the clamping module 30, the clamping structure 31, the clamping space 311, the second screw 312, the positioning sleeve 313, the gasket 314 and the second nut 315;

a drive mechanism 40, a drive motor 41, a first pulley 42, a second pulley 43, and a timing belt 44;

the grinding device 50, the grinding piece 51, the grinding part 511, the sliding part 512, the limiting part 513, the elastic piece 52, the mounting seat 53, the first through hole 531 and the fixing piece 54;

first screw 61, first nut 62, bearing seat 70, valve seat 81, sealing washer 82.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper and lower directions, is the orientation or positional relationship shown on the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

As shown in fig. 1 to 3 and 5, a grinder for a triple offset butterfly valve according to an embodiment of the present invention includes: a frame 10; the supporting piece 20 is rotatably arranged on the frame 10, and a clamping module 30 for clamping a workpiece is arranged on the supporting piece 20; the driving mechanism 40 is in transmission connection with the supporting piece 20; and the grinding device 50 is arranged on the frame 10, the grinding device 50 comprises a grinding piece 51 which is arranged in a sliding mode, the grinding piece 51 is matched with the clamping module 30 to grind the workpiece, and the grinding piece 51 can be kept in a joint state with the workpiece during grinding.

According to the utility model discloses a grind machine for three eccentric butterfly valves, through being provided with grinder 50, grind 51 through the slip setting and remove and make and grind 51 and keep being in laminating grinding state with the work piece when supporting piece 20 rotates, simple structure and reasonable, compare with prior art, replaced artifical the grinding, can grind automatically, reduce working strength, it is higher to improve work efficiency, and the planarization and the continuity of the oval sealed face after the work piece grinds are better, the quality of finished products is improved.

As shown in fig. 1 to 4, in some embodiments of the present invention, the grinding device 50 includes an elastic member 52 and a connecting structure, one end of the connecting structure is connected to the frame 10, the grinding member 51 is slidably disposed at the other end of the connecting structure, and the elastic member 52 is disposed between the grinding member 51 and the connecting structure. The elastic part 52 can push the grinding part 51 to be better attached to the elliptical sealing surface of the workpiece, changes along with the curvature change of the sealing surface of the workpiece, realizes automatic attachment and flexible contact, and has simple structure and convenient installation.

As shown in fig. 1 to 4, in some embodiments of the present invention, the grinding member 51 includes a grinding portion 511, a sliding portion 512 and a limiting portion 513 connected in sequence; the connecting structure comprises a mounting seat 53 and a fixing part 54, one end of the mounting seat 53 is connected to the frame 10, the fixing part 54 is connected to one end of the mounting seat 53, a sliding part 512 is slidably connected to the fixing part 54, the grinding part 511 is located on one side of the fixing part 54, a limiting part 513 is located on the other side of the fixing part 54 and can limit the grinding part 51 to be separated from the fixing part 54, the elastic part 52 is arranged between the grinding part 511 and the fixing part 54, and the elastic part 52 can always push the grinding part 511 to be always attached to the oval sealing surface of the workpiece. By adopting the structure, when the supporting piece 20 drives the workpiece to rotate, the elastic piece 52 can push the grinding part 511 to be better attached to the elliptical sealing surface of the workpiece, and the grinding part is changed along with the curvature change of the sealing surface of the workpiece, so that automatic attachment and flexible contact are realized, and the structure is simple and the installation is convenient.

It should be noted that, in some embodiments of the present invention, the elastic member 52 is a compression spring, and the compression spring is sleeved on the sliding portion 512 of the grinding member 51; the fixing piece 54 is provided with a sliding channel for the sliding part 512 to slide, one end of the sliding part 512 is fixedly connected with the grinding part 511, the other end of the sliding part 512 is provided with external threads, the limiting part 513 is a limiting nut screwed with the sliding part 512, the outer diameter of the limiting part 513 and the outer diameter of the grinding part 511 are both larger than the inner diameter of the sliding channel, and the sliding part 512 and the limiting part 513 are detachably connected by adopting a structure, so that the disassembly, assembly and maintenance are convenient; in some embodiments of the present invention, the grinding portion 511 includes a supporting block and a gauze detachably mounted on the supporting block, so as to facilitate maintenance and replacement for users, and other grinding structures are also possible. In some embodiments, the elastic member 52 may also be a disc spring or an elastic pad 314, etc., which is not limited herein.

It should be noted that, in the utility model discloses in, mounting 54 rotates with mount pad 53 through the connecting axle to screw up the location through fasteners such as screw, the adjustment of adaptable different processing angles.

As shown in fig. 1 to 4, in some embodiments of the present invention, the mounting seat 53 is slidably disposed on the frame 10, and a locking assembly for limiting the moving position of the mounting seat 53 is disposed between the mounting seat 53 and the frame 10. Through being provided with this locking Assembly, can be according to the sealed face aperture size of ellipse of work piece, and then adjust this connection structure's mounted position, adjust convenient and nimble setting.

In the specific embodiment, the mounting base 53 is provided with a first through hole 531, and the rack 10 is provided with a second through hole 11 corresponding to the first through hole 531; the locking assembly comprises a first threaded member 61 and a first nut 62, wherein the first threaded member 61 is arranged through the first through hole 531 and the second through hole 11 and is screwed on the first nut 62. Through loosening first nut 62, mount pad 53 moves relative frame 10, when mount pad 53 removed to preset position, screwed up first nut 62 to the relative position of fixed mounting seat 53 and frame 10, it is convenient to adjust, easy dismounting, and simple structure is reasonable. In some embodiments of the present invention, the length of the first through hole 531 is less than the length of the second through hole 11, and of course, in some embodiments, the length of the first through hole 531 may be equal to or greater than the length of the second through hole 11, which still has the above-mentioned effect.

It should be noted that, in some embodiments of the present invention, the number of the first screw members 61 and the number of the first nuts 62 are both set to two, so as to improve the stability of the installation.

Of course, in some embodiments, the rack 10 is provided with a slide rail cooperating with the mounting seat 53, and the locking component may also be a telescopic cylinder device capable of limiting the telescopic stroke, which is not limited herein.

Of course, in some embodiments, the mounting seat 53 and the fixing member 54 may also be a single-piece structure, which is not limited herein.

It will be appreciated that in some embodiments of the present invention, as shown in fig. 1 to 4, a grinding station is provided on each side of the frame 10; the number of the clamping modules 30 is two, the two groups of clamping modules 30 are respectively positioned at two sides of the supporting member 20, one group of clamping modules 30 corresponds to one grinding station, and the other group of clamping modules 30 corresponds to the other grinding station; wherein, the number of grinder 50 sets up to two sets ofly, and two sets of grinder 50 set up respectively in two grinding stations. Set up two and grind the station, structural design is reasonable, has improved production efficiency greatly, has reduced the labour, saves manufacturing cost.

As shown in fig. 1 to 3, in some embodiments of the present invention, the supporting member 20 includes a rotating portion 21 and two mounting portions 22 fixedly connected to the rotating portion 21, the rotating portion 21 is rotatably disposed on the frame 10, the two mounting portions 22 are respectively located at two ends of the rotating portion 21, the rotating portion 21 is in transmission connection with the driving mechanism 40, and the two mounting portions 22 and the two clamping modules 30 are arranged in a one-to-one correspondence. Simple structure, and drive rotation portion 21 through actuating mechanism 40 and rotate, drive installation department 22 then and rotate, the transmission is stable, and the installation is reliable.

It can be understood that, in some embodiments of the present invention, the rotating portion 21 is rotatably mounted to the frame 10 through the bearing seat 70, and the rotation is stable and reliable; the rotating portion 21 and the mounting portion 22 may be of a split structure, or alternatively, may be of a split structure, and they are fixedly connected.

As shown in fig. 1 to fig. 3 and fig. 5, in some embodiments of the present invention, the clamping module 30 includes a plurality of sets of clamping structures 31, and a clamping space 311 for clamping a workpiece is disposed on each of the clamping structures 31; in the two grinding stations, the grinding member 51 of one of the grinding devices 50 is disposed away from the center of the rotating portion 21, and the other grinding device 50 is disposed toward the center of the rotating portion 21. With the structure, the valve seat 81 is clamped inside the clamping structure 31 on one of the mounting parts 22, the grinding piece 51 close to the grinding station extends into the clamping structure 31, and the valve seat 81 is positioned between the clamping structure 31 and the grinding piece 51; the sealing ring 82 is clamped on the outer side of the clamping structure 31 on the other mounting part 22, the grinding piece 51 close to the grinding station is positioned on the outer side of the clamping structure 31, the sealing ring 82 is positioned between the clamping structure 31 and the grinding piece 51, the valve seat 81 and the sealing ring 82 are simultaneously ground, the structural design is reasonable, the work efficiency is greatly improved, the labor force is reduced, and the production cost is saved.

It should be noted that, in some embodiments of the present invention, the number of the clamping structures 31 is set to four groups, and the four groups of the clamping structures 31 are evenly spaced and arranged around the mounting portion 22. Simple structure provides the stability of work piece centre gripping. Of course, in some embodiments, the four sets of clamping structures 31 may also be arranged at uneven intervals; it should be noted that the number of the clamping structures 31 may be three, five or more, and is not limited herein.

It should be noted that, in some embodiments of the present invention, the oval sealing surface of the grinding valve seat 81 is the inner side wall of the valve seat 81, and the oval sealing surface of the grinding sealing ring 82 is the outer side wall of the sealing ring 82.

In some embodiments of the present invention, the clamping structure 31 includes a second screw 312, a positioning sleeve 313, a gasket 314 and a second nut 315, the mounting portion 22 is provided with a sliding groove 221, the second screw 312 includes a head and a threaded rod portion, the head is slidably disposed in the sliding groove 221, the rod portion extends out to the outside along the sliding groove 221, the positioning sleeve 313 and the gasket 314 are both sleeved on the rod portion, the positioning sleeve 313 abuts against the mounting portion 22, the second nut 315 is screwed on the rod portion and abuts against the gasket 314, and the clamping space 311 is disposed between the gasket 314 and the positioning sleeve 313. By adopting the structure, the head part of the second threaded part 312 can be movably arranged relative to the sliding groove 221, so that the workpiece valve seats 81 and the sealing rings 82 with different sizes can be fixed, and the application range is wide.

It should be noted that, in some embodiments of the present invention, the second screw member 312 of the clamping structure 31 is provided with an annular step portion. In the clamping structure 31 matched with the valve seat 81, one end face of the positioning sleeve 313 is aligned with one side face of the annular step part to form a clamping space 311 matched with the gasket 314 for clamping the valve seat 81, the gasket 314 abuts against one side of a workpiece, the positioning sleeve 313 abuts against the other side of the workpiece, the gasket 314 and the positioning sleeve 313 are pressed and locked against the valve seat 81 by screwing the second nut 315, and meanwhile, the second threaded part 312 can be limited from moving relative to the sliding groove 221; in the clamping structure 31 matched with the sealing ring 82, the annular step portion is matched with the gasket 314 to form a clamping space 311 for clamping the sealing ring 82, and the gasket 314 and the annular step portion are pressed against and locked to the sealing ring 82 by tightening the second nut 315, although the clamping thickness of the sealing ring 82 is changed to be the same as the clamping thickness of the valve seat 81, the clamping method can also be the same as the clamping method of the valve seat 81.

It will be appreciated that the dimensions of the various components of the clamp structure 31 can be selected to accommodate the thickness of the workpiece to be clamped.

Of course, in some embodiments, the clamping structure 31 may also include a driving member and two clamping jaws in transmission connection with the driving member, the two clamping jaws can be folded or unfolded, and the two clamping jaws can be driven by the driving member to approach each other to clamp the workpiece, it is understood that the driving member may be a motor or a telescopic cylinder. Of course, the clamping structure 31 may be other structures, and is not limited herein.

It can be understood that, as shown in fig. 1 to 3, in some embodiments of the present invention, the driving mechanism 40 includes a driving motor 41, a first pulley 42, a second pulley 43 and a synchronous belt 44, the driving motor 41 is fixedly disposed on the frame 10, the first pulley 42 is fixedly connected to a rotating shaft of the driving motor 41, the second pulley 43 is fixedly connected to the supporting member 20, and the first pulley 42 and the second pulley 43 are in transmission connection through the synchronous belt 44. The driving motor 41 drives the first belt pulley 42 to rotate, the synchronous belt 44 rotates, and then the second belt pulley 43 is driven to drive the bearing piece 20 to rotate.

Of course, in some embodiments, the driving mechanism 40 may also be provided with a gear transmission mechanism, or other mechanisms, etc., which are not limited herein.

In some embodiments of the present invention, the frame 10 is formed by combining a plurality of supports, and the width from the upper portion to the lower portion of the frame 10 is gradually increased along the vertical direction, so as to improve the structural stability of the frame 10.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. A grinder for triple offset butterfly valves, comprising:

a frame (10);

the supporting piece (20) is rotatably arranged on the rack (10), and a clamping module (30) used for clamping a workpiece is arranged on the supporting piece (20);

a driving mechanism (40) which is in transmission connection with the supporting piece (20);

the grinding device (50) is arranged on the rack (10), the grinding device (50) comprises a grinding piece (51) which is arranged in a sliding mode, the grinding piece (51) is matched with the clamping module (30) to grind the workpiece, and the grinding piece (51) can be kept in a joint state with the workpiece during grinding.

2. A grinder for triple offset butterfly valves according to claim 1, characterised in that the grinding means (50) comprise an elastic element (52) and a connection structure, one end of which is connected to the frame (10), the grinding element (51) being slidingly arranged at the other end of the connection structure, and the elastic element (52) being arranged between the grinding element (51) and the connection structure.

3. A grinder for triple offset butterfly valves according to claim 2, characterized in that said grinding member (51) comprises a grinding portion (511), a sliding portion (512) and a limiting portion (513) connected in sequence;

the connecting structure comprises a mounting seat (53) and a fixing piece (54), one end of the mounting seat (53) is connected to the rack (10), the fixing piece (54) is connected to one end of the mounting seat (53), the sliding part (512) is connected to the fixing piece (54) in a sliding mode, the grinding part (511) is located on one side of the fixing piece (54), the limiting part (513) is located on the other side of the fixing piece (54) and can limit the grinding piece (51) to be separated from the fixing piece (54), the elastic piece (52) is arranged between the grinding part (511) and the fixing piece (54), and the elastic piece (52) can always push the grinding part (511) to be always attached to the oval sealing surface of the workpiece.

4. A grinder for triple offset butterfly valves according to claim 3, characterised in that the mounting seat (53) is slidably arranged on the frame (10) and a locking assembly for limiting the position of movement of the mounting seat (53) is arranged between the mounting seat (53) and the frame (10).

5. A grinder for triple offset butterfly valves according to claim 4, characterized in that said mounting seat (53) is provided with a first through hole (531), said frame (10) is provided with a second through hole (11) corresponding to said first through hole (531);

the locking assembly comprises a first threaded part (61) and a first nut (62), wherein the first threaded part (61) penetrates through the first through hole (531) and the second through hole (11) and is screwed with the first nut (62).

6. A grinder for triple offset butterfly valves according to claim 1 or 5, characterized in that a grinding station is provided on each side of the frame (10);

the number of the clamping modules (30) is two, the two groups of clamping modules (30) are respectively positioned at two sides of the supporting piece (20), one group of clamping modules (30) corresponds to one grinding station, and the other group of clamping modules (30) corresponds to the other grinding station;

the number of the grinding devices (50) is two, and the two groups of the grinding devices (50) are respectively arranged at the two grinding stations.

7. A grinder for triple offset butterfly valves according to claim 6, characterized in that the support (20) comprises a rotation portion (21) and two mounting portions (22) fixedly connected to the rotation portion (21), the rotation portion (21) being rotatably arranged in the frame (10), the two mounting portions (22) being respectively located at the two ends of the rotation portion (21), the rotation portion (21) being in transmission connection with the driving mechanism (40), the two mounting portions (22) and the two clamping modules (30) being arranged in a one-to-one correspondence.

8. A grinding machine for triple offset butterfly valves according to claim 7, characterized in that the clamping module (30) comprises a plurality of groups of clamping structures (31), the clamping structures (31) being provided with clamping spaces (311) for clamping the work pieces;

in the two grinding stations, the grinding piece (51) of one grinding device (50) is arranged back to the center of the rotating part (21), and the other grinding device (50) is arranged towards the center of the rotating part (21).

9. A grinder for triple offset butterfly valves according to claim 8, characterized in that the clamping structure (31) comprises a second threaded element (312), a positioning sleeve (313), a washer (314) and a second nut (315), a sliding slot (221) is provided on the mounting portion (22), the second threaded element (312) comprises a head and a threaded stem, the head is slidingly arranged in the sliding slot (221), and the stem extends to the outside along the sliding slot (221), the positioning sleeve (313) and the washer (314) are both sleeved on the stem, the positioning sleeve (313) abuts on the mounting portion (22), the second nut (315) is screwed on the stem and abuts on the washer (314), and the clamping space (311) is provided between the washer (314) and the positioning sleeve (313).

10. A grinder for triple offset butterfly valves according to claim 1, characterized in that the drive mechanism (40) comprises a drive motor (41), a first pulley (42), a second pulley (43) and a timing belt (44), the drive motor (41) being fixedly arranged on the frame (10), the first pulley (42) being fixedly connected to the rotation shaft of the drive motor (41), the second pulley (43) being fixedly connected to the support (20), the first pulley (42) and the second pulley (43) being drivingly connected by the timing belt (44).