CN116372612A

CN116372612A - Valve positioning tool and valve processing method

Info

Publication number: CN116372612A
Application number: CN202310305978.8A
Authority: CN
Inventors: 李平; 林光办; 叶迅良; 卢再望; 李正华; 杨水松; 胡道忠; 叶超超; 吕智健
Original assignee: Zhejiang Bertley Technology Co ltd
Current assignee: Zhejiang Bertley Technology Co ltd
Priority date: 2023-03-27
Filing date: 2023-03-27
Publication date: 2023-07-04

Abstract

The invention relates to the field of mechanical positioning fixtures, and particularly discloses a valve positioning tool and a valve processing method, wherein the valve positioning tool comprises a shell, a frame body is arranged in the shell, a valve body to be processed is arranged in the frame body, a lifting mechanism is arranged in the frame body, and a clamping mechanism is arranged at the top end of the lifting mechanism; through the setting of hoist mechanism, can help lifting the valve body to the height that positioning mechanism can touch, positioning mechanism finds the reference position through inserting the locating cone in the round hole groove of valve body internal standard, then hoist mechanism and fixture are fixed for the support to the valve body centre gripping with this, be used for switching the terminal surface of valve body through the shifter in subsequent processing, accomplish the processing of other terminal surfaces in the convenience once fixed, labour saving and time saving improves machining efficiency, this invention can fix a position the special-shaped curved surface valve body as shown in fig. 2 and process, and be applicable to ordinary standard valve body, the suitability is better, it is more nimble to use.

Description

Valve positioning tool and valve processing method

Technical Field

The invention relates to the field of mechanical positioning fixtures, in particular to a valve positioning tool and a valve processing method.

Background

After casting and forming, the valve needs milling and forming to ensure the machining precision, so that the valve body needs to be well positioned to ensure the machining quality, the valve body is clamped and fixed by the two clamping blocks which synchronously and reversely move in the existing positioning mode, the valve body with a standard reference surface can only be positioned and clamped in the existing positioning mode, but the valve body is designed with a special-shaped curved surface, as shown in fig. 2, the traditional clamp is difficult to take care of the nonstandard special-shaped curved surface, and the valve body is inclined after clamping due to the fact that the contact positioning point is difficult to attach the special-shaped curved surface, and the machining end face is difficult to be positioned.

Disclosure of Invention

The invention aims to provide a valve positioning tool and a valve processing method, which are used for solving the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the utility model provides a valve positioning tool, includes the casing, the internally mounted of casing has the framework, the inside of framework is equipped with the valve body of required processing, the internally mounted of framework has elevating system, elevating system's top is equipped with fixture, elevating system and fixture combined action centre gripping fixed valve body, one side of framework is equipped with positioning mechanism, positioning mechanism is used for carrying out interim location to the valve body, elevating system's bottom is equipped with switching mechanism, switching mechanism is used for adjusting the angle orientation of valve body; an opening for taking and placing the valve body is formed in one side, close to the frame, of the shell, and a rotating shaft assembly used for being connected with external equipment is arranged on the other side of the shell.

Specifically, the lifting mechanism comprises a first hydraulic rod, the first hydraulic rod is installed in the shell, a lifting plate is arranged in the frame, and a piston rod of the first hydraulic rod penetrates through the frame and is rotationally connected with the top end of the piston rod.

Specifically, the lifting mechanism further comprises a first shaft sleeve and a second shaft sleeve, the first shaft sleeve and the second shaft sleeve are sleeved outside the piston rod of the first hydraulic rod, the diameter of the first shaft sleeve is larger than that of the second shaft sleeve, the first shaft sleeve is movably connected with the second shaft sleeve, the first shaft sleeve is fixedly connected with the bottom end of the lifting plate, and the second shaft sleeve is fixedly connected with the frame body.

Specifically, elevating system still includes the butt joint board, a plurality of butt joint boards are installed on the top of elevating system, the spout that the cross-section is T form has been seted up to the inside of butt joint board, the contact block that is the U word form is settled on the top of butt joint board, the inside sliding connection of spout has a spacing bolt, the top cover of spacing bolt has the gasket, the top of gasket is equipped with fixation nut, gasket and spacing bolt mutually support and install the contact block on the butt joint board, the valve body is settled on the contact block.

Specifically, positioning mechanism includes the slide bar, the both ends of valve body are equipped with a slide bar respectively, slide bar sliding connection framework, two flange is installed respectively to the relative one end of slide bar, flange's one end sliding connection has the locating cone, it has buffer spring to contradict between locating cone and the flange, the appearance of locating cone is the taper, the locating cone inserts the hole inslot of reserving in the valve body.

Specifically, positioning mechanism still includes the connecting rod, the one end fixedly connected with connecting rod of slide bar, the one end fixedly connected with ratch of connecting rod, two the ratch is in the inside sliding connection of casing, two the common meshing has first gear between the ratch, the internally mounted of casing has positioning motor, positioning motor's motor shaft drive first gear rotates.

Specifically, fixture includes the support frame, the top fixedly connected with two support frames of lift plate, two rotate between the support frame and be connected with the deflector, a plurality of movable clamp splice are installed to the bottom side of deflector, movable clamp splice and valve body contact.

Specifically, fixture still includes the lug, the bottom fixedly connected with two lugs of lift plate, two the lug is the symmetry setting, two rotate between the lug and be connected with the second hydraulic stem, the piston rod and the deflector of second hydraulic stem rotate to be connected, the deflector of second hydraulic stem drive deflects the centre gripping valve body.

Specifically, the switching mechanism comprises a switching motor, the switching motor is installed to the bottom of framework, the motor shaft of switching motor passes framework and top fixedly connected with second gear, the bottom fixedly connected with second gear of first axle sleeve, the thickness of second gear is greater than the second gear, second gear and third gear mesh mutually, the switching motor passes through second gear, third gear drive lifting plate deflection angle.

Specifically, a valve positioning tool and a valve processing method, comprising the following steps:

a: firstly, mounting a shell on a machine tool to be processed, putting a valve body to be processed into a frame body, and placing the valve body at the top end of a lifting mechanism;

b: then starting a lifting mechanism to lift the height of the valve body so that the horizontal height of the valve body corresponds to the height position of the positioning mechanism;

c: then starting a positioning mechanism, and accurately identifying and finding out the reference position of the valve body through the positioning cone in the inner hole of the positioning cone for positioning;

d: then, the lifting mechanism continuously moves and contacts with the valve body according to the positioned height of the valve body, the clamping mechanism is started to clamp the valve body, and the positioning mechanism is removed after clamping is finished;

e: finally, after the end face of the current valve body is required to be processed, starting a switching mechanism to switch the angle of the valve body, and switching other unprocessed end faces of the valve body to the outside of the shell for processing.

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the invention, the valve body can be lifted to the height which can be contacted by the positioning mechanism through the arrangement of the lifting mechanism, the positioning mechanism can find the reference position by inserting the positioning cone into the standard round hole groove in the valve body, then the lifting mechanism and the clamping mechanism clamp and fix the valve body by taking the reference position as a support, the end face of the valve body is switched by the switching mechanism in subsequent processing, the processing of other end faces is conveniently finished in one-time fixing, time and labor are saved, the processing efficiency is improved, the special-shaped curved surface valve body shown in fig. 2 can be positioned and processed, and the special-shaped curved surface valve body is suitable for common standard valve bodies, has better applicability and is more flexible to use.

Drawings

FIG. 1 is a schematic structural diagram of an overall structure of a preferred embodiment of a valve positioning tool and a valve processing method according to the present invention;

FIG. 2 is a schematic view of the valve body shown in FIG. 1;

FIG. 3 is a schematic diagram of the connection structure of the lifting mechanism, the positioning mechanism, the clamping mechanism and the switching mechanism shown in FIG. 1;

FIG. 4 is a schematic view of the other view shown in FIG. 3;

FIG. 5 is a schematic view of the connection structure of the lifting mechanism and the switching mechanism shown in FIG. 3;

FIG. 6 is a schematic view of the other view shown in FIG. 5;

FIG. 7 is a schematic view of a portion of the lifting mechanism shown in FIG. 5;

FIG. 8 is a schematic view of the positioning mechanism shown in FIG. 4;

FIG. 9 is a schematic view of a portion of the structure shown in FIG. 8;

fig. 10 is a schematic view of the connection structure of the lifting mechanism and the clamping mechanism shown in fig. 4.

In the figure: 1. a housing; 2. a frame; 3. a valve body; 4. a lifting mechanism; 41. a first hydraulic lever; 42. a lifting plate; 43. an abutting plate; 44. a contact block; 45. a chute; 46. a limit bolt; 47. a gasket; 48. a fixing nut; 49. a first sleeve; 491. a second sleeve; 5. a positioning mechanism; 51. a slide bar; 52. positioning cone; 53. a connecting flange; 54. a connecting rod; 55. a toothed bar; 56. positioning a motor; 57. a first gear; 58. a buffer spring; 6. a clamping mechanism; 61. a support frame; 62. a deflector plate; 63. a bump; 64. a second hydraulic lever; 65. a movable clamping block; 7. a switching mechanism; 71. switching the motor; 72. a second gear; 73. and a third gear.

Detailed Description

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-10, the valve positioning tool of the invention comprises a shell 1, wherein a frame body 2 is arranged in the shell 1, a valve body 3 to be processed is arranged in the frame body 2, a lifting mechanism 4 is arranged in the frame body 2, a clamping mechanism 6 is arranged at the top end of the lifting mechanism 4, the lifting mechanism 4 and the clamping mechanism 6 jointly act to clamp and fix the valve body 3, a positioning mechanism 5 is arranged at one side of the frame body 2, the positioning mechanism 5 is used for temporarily positioning the valve body 3, a switching mechanism 7 is arranged at the bottom end of the lifting mechanism 4, and the switching mechanism 7 is used for adjusting the angle orientation of the valve body 3; an opening for taking and placing the valve body 3 is formed in one side, close to the frame body 2, of the shell body 1, and a rotating shaft assembly used for being connected with external equipment is arranged on the other side of the shell body 1.

Specifically, the lifting mechanism 4 includes a first hydraulic rod 41, the first hydraulic rod 41 is installed in the housing 1, a lifting plate 42 is disposed in the housing 2, a piston rod of the first hydraulic rod 41 passes through the housing 2, and the top end of the piston rod is rotationally connected with the lifting plate 42; the outer part of the piston rod of the first hydraulic rod 41 is sleeved with a first shaft sleeve 49 and a second shaft sleeve 491, the diameter of the first shaft sleeve 49 is larger than that of the second shaft sleeve 491, the first shaft sleeve 49 is movably connected with the second shaft sleeve 491, the first shaft sleeve 49 is fixedly connected with the bottom end of the lifting plate 42, and the second shaft sleeve 491 is fixedly connected with the frame body 2; a plurality of abutting plates 43 are arranged at the top end of the lifting plate 42, a chute 45 with a T-shaped cross section is formed in the abutting plates 43, a U-shaped contact block 44 is arranged at the top end of each abutting plate 43, a limit bolt 46 is connected in a sliding manner in each chute 45, a gasket 47 is sleeved at the top end of each limit bolt 46, a fixing nut 48 is arranged at the top end of each gasket 47, and the fixing nuts 48, the gaskets 47 and the limit bolts 46 are mutually matched to install the contact block 44 on the abutting plates 43, and the valve body 3 is arranged on the contact block 44; firstly, the shell 1 is mounted on a machine tool, the valve body 3 to be processed is put into the frame 2, the valve body 3 is placed on a plurality of contact blocks 44, the first hydraulic rod 41 is started, the first hydraulic rod 41 pushes the lifting plate 42 at the top end to be slightly lower than the horizontal position of the reference shaft of the positioning cone 52 through the height of the lifting plate 42 at the top end of the piston rod, the first shaft sleeve 49 is fixedly connected with the bottom end of the lifting plate 42, the second shaft sleeve 491 is fixedly connected with the frame 2, and the first shaft sleeve 49 and the second shaft sleeve 491 are connected in a sliding mode and a rotating mode, so that stability and accuracy of the lifting plate 42 in lifting movement can be improved.

Specifically, the positioning mechanism 5 includes a sliding rod 51, two ends of the valve body 3 are respectively provided with a sliding rod 51, the sliding rods 51 are slidably connected with the frame 2, two opposite ends of the sliding rods 51 are respectively provided with a connecting flange 53, one end of the connecting flange 53 is slidably connected with a positioning cone 52, a buffer spring 58 is abutted between the positioning cone 52 and the connecting flange 53, the positioning cone 52 is cone-shaped, and the positioning cone 52 is inserted into a hole groove reserved in the valve body 3; one end of the sliding rod 51 is fixedly connected with a connecting rod 54, one end of the connecting rod 54 is fixedly connected with a toothed bar 55, two toothed bars 55 are in sliding connection in the shell 1, a first gear 57 is meshed between the two toothed bars 55 together, a positioning motor 56 is arranged in the shell 1, and a motor shaft of the positioning motor 56 drives the first gear 57 to rotate; starting the positioning motor 56, the positioning motor 56 drives the first gear 57 to rotate, the first gear 57 drives the two toothed bars 55 to synchronously and reversely move, the sliding rod 51 slides in the frame 2 and carries the connecting flange 53 and the positioning cone 52 to move by the driving of the connecting rod 54, the two positioning cones 52 are finally inserted into empty slots at two ends of the valve body 3, the valve body 3 is separated from the contact block 44 along with the further approach of the two positioning cones 52, the positioning cone 52 is temporarily positioned to the reference position of the valve body 3, and the buffer spring 58 is abutted between the positioning cone 52 and the connecting flange 53 and used for delaying the impact force of the positioning cone 52 and delaying the surface abrasion condition of the positioning cone 52.

Specifically, the clamping mechanism 6 includes a supporting frame 61, the top end of the lifting plate 42 is fixedly connected with two supporting frames 61, a deflection plate 62 is rotatably connected between the two supporting frames 61, a plurality of movable clamping blocks 65 are mounted on the bottom side of the deflection plate 62, and the movable clamping blocks 65 are in contact with the valve body 3; the bottom end of the lifting plate 42 is fixedly connected with two protruding blocks 63, the two protruding blocks 63 are symmetrically arranged, a second hydraulic rod 64 is rotationally connected between the two protruding blocks 63, a piston rod of the second hydraulic rod 64 is rotationally connected with the deflection plate 62, and the second hydraulic rod 64 drives the deflection plate 62 to deflect and clamp the valve body 3; according to the found reference of the positioning cone 52, the lifting plate 42 is continuously lifted, so that the contact blocks 44 are in contact with the valve body 3, the contact surface is sufficient, the second hydraulic rod 64 is started, the first hydraulic rod 41 and the second hydraulic rod 64 are provided with self-locking functions, the second hydraulic rod 64 drives the piston rod to move outwards, the deflection plate 62 is driven to start deflecting, the movable clamping blocks 65 on the deflection plate 62 are clamped to the top side of the valve body 3, the valve body 3 is temporarily fixed by virtue of the positioning cone 52, the contact blocks 44 and the movable clamping blocks 65 are simultaneously applied to the upper side and the lower side of the valve body 3, and a plurality of components are jointly contacted with the valve body 3 by virtue of the found reference, so that a good positioning effect can be continuously carried out on the valve body 3 by continuing the reference; after the valve body 3 is clamped by the lifting mechanism 4 and the clamping mechanism 6, the positioning motor 56 is started to reversely rotate, the positioning cone 52 is removed, at this time, the lifting mechanism 4 and the clamping mechanism 6 keep on keeping the result of the positioning cone 52, and sufficient space is provided for the subsequent movement of the lifting plate 42 by removing the positioning cone 52.

Specifically, the switching mechanism 7 includes a switching motor 71, the bottom end of the frame 2 is provided with the switching motor 71, a motor shaft of the switching motor 71 passes through the frame 2 and is fixedly connected with a second gear 72 at the top end, the bottom end of the first shaft sleeve 49 is fixedly connected with a second gear 72, the thickness of the second gear 72 is greater than that of the second gear 72, the second gear 72 is meshed with a third gear 73, and the switching motor 71 drives the lifting plate 42 to deflect by an angle through the second gear 72 and the third gear 73; generally, the valve body 3 has several end surfaces to be machined, after the current end surface machining is completed, the switching motor 71 is started, the switching motor 71 and the positioning motor 56 are both servo motors, the switching motor 71 drives the second gear 72 to rotate, and the second gear 72 drives the lifting plate 42 to deflect around the second shaft bushing 491 to a proper angle by meshing the third gear 73, so that the end surface to be machined next is switched to the outside of the shell 1, the end surface position of the valve body 3 is adjusted without manual repeated disassembly and assembly, the subsequent machining of other end surfaces is convenient for one-time fixation, the use effect is better, time and labor are saved, and the machining efficiency is improved.

a: firstly, mounting a shell 1 on a machine tool to be processed, putting a valve body 3 to be processed into a frame 2, and placing the valve body 3 at the top end of a lifting mechanism 4;

b: then, starting the lifting mechanism 4 to lift the height of the valve body 3 so that the horizontal height of the valve body 3 corresponds to the height position of the positioning mechanism 5;

c: then starting a positioning mechanism 5, and accurately identifying and finding out the reference position of the valve body 3 through the positioning cone 52 in the inner hole of the positioning cone 52 for positioning;

d: then, the lifting mechanism 4 continuously moves to contact with the valve body 3 according to the height of the positioned valve body 3, the clamping mechanism 6 is started to clamp the valve body 3, and the positioning mechanism 5 is removed after clamping is finished;

e: finally, after the end face of the current valve body 3 is required to be machined, the switching mechanism 7 is started to switch the angle of the valve body 3, and other unprocessed end faces of the valve body 3 are switched to the outside of the shell 1 for machining.

The working principle of the invention is as follows: firstly, mounting a shell 1 on a machine tool, putting a valve body 3 to be processed into a frame 2, placing the valve body 3 on a plurality of contact blocks 44, starting a first hydraulic rod 41, pushing the height of a lifting plate 42 at the top end of the first hydraulic rod 41 through a piston rod, lifting the valve body 3 to a horizontal position slightly lower than a reference shaft of a positioning cone 52, fixedly connecting the bottom end of the lifting plate 42 with a first shaft sleeve 49, fixedly connecting the frame 2 with a second shaft sleeve 491, and connecting the first shaft sleeve 49 with the second shaft sleeve 491 in a sliding and rotating manner, so that the stability and the accuracy of lifting of the lifting plate 42 during lifting movement can be improved; then, a positioning motor 56 is started, the positioning motor 56 drives a first gear 57 to rotate, the first gear 57 drives two toothed bars 55 to synchronously and reversely move, the sliding bar 51 slides in the frame body 2 by being driven by a connecting rod 54 and carries a connecting flange 53 and positioning cones 52 to move, and finally, the two positioning cones 52 are inserted into empty slots at two ends of the valve body 3, the valve body 3 is separated from a contact block 44 along with the further approach of the two positioning cones 52, the positioning cones 52 are temporarily positioned to the reference position of the valve body 3, and a buffer spring 58 is abutted between the positioning cones 52 and the connecting flange 53 and used for delaying the impact force of the positioning cones 52 and delaying the surface abrasion condition of the positioning cones 52; according to the reference found by the locating cone 52, the height of the lifting plate 42 is continuously lifted, a plurality of contact blocks 44 are in contact with the valve body 3, the contact surface is sufficient, then a second hydraulic rod 64 is started, the first hydraulic rod 41 and the second hydraulic rod 64 are provided with self-locking functions, the second hydraulic rod 64 drives a piston rod to move outwards, the deflection plate 62 is driven to start deflecting, a plurality of movable clamping blocks 65 on the deflection plate 62 are clamped to the top side of the valve body 3, the valve body 3 is temporarily fixed by the locating cone 52, the plurality of contact blocks 44 and the movable clamping blocks 65 are simultaneously acted on the upper side and the lower side of the valve body 3, and a plurality of components are jointly contacted with the valve body 3 by depending on the found reference, so that good locating effect can be continuously carried out on the valve body 3 by continuing the reference; after the valve body 3 is clamped by the lifting mechanism 4 and the clamping mechanism 6, the positioning motor 56 is started to rotate reversely, the positioning cone 52 is removed, the lifting mechanism 4 and the clamping mechanism 6 keep the result of the positioning cone 52, and the positioning cone 52 is removed to provide sufficient space for the follow-up lifting plate 42 to move; the valve body 3 is provided with a plurality of end faces needing to be processed generally, after the current end face processing is finished, the switching motor 71 is started, the switching motor 71 and the positioning motor 56 are servo motors, the switching motor 71 drives the second gear 72 to rotate, and the second gear 72 drives the lifting plate 42 to deflect to a proper angle around the second shaft bushing 491 by engaging the third gear 73, so that the end face needing to be processed next is switched to the outside of the shell 1, the end face position of the valve body 3 is not required to be repeatedly dismounted and adjusted by manpower, the valve body is convenient to process other end faces at one time, the use effect is better, time and labor are saved, and the processing efficiency is improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides a valve positioning tool, its characterized in that includes casing (1), internally mounted of casing (1) has framework (2), the inside of framework (2) is equipped with valve body (3) of required processing, the internally mounted of framework (2) has elevating system (4), the top of elevating system (4) is equipped with fixture (6), elevating system (4) and fixture (6) combined action centre gripping fixed valve body (3), one side of framework (2) is equipped with positioning mechanism (5), positioning mechanism (5) are used for carrying out temporary positioning to valve body (3), the bottom of elevating system (4) is equipped with shifter (7), shifter (7) are used for adjusting the angle orientation of valve body (3); an opening for taking and placing the valve body (3) is formed in one side, close to the frame body (2), of the shell (1), and a rotating shaft assembly used for being connected with external equipment is arranged on the other side of the shell (1).

2. Valve positioning tool according to claim 1, characterized in that the lifting mechanism (4) comprises a first hydraulic rod (41), the first hydraulic rod (41) is mounted in the housing (1), a lifting plate (42) is arranged in the frame (2), a piston rod of the first hydraulic rod (41) penetrates through the frame (2) and the top end of the piston rod is rotatably connected with the lifting plate (42).

3. A valve positioning tool according to claim 2, wherein the lifting mechanism (4) further comprises a first shaft sleeve (49) and a second shaft sleeve (491), the first shaft sleeve (49) and the second shaft sleeve (491) are sleeved outside the piston rod of the first hydraulic rod (41), the diameter of the first shaft sleeve (49) is larger than that of the second shaft sleeve (491), the first shaft sleeve (49) is movably connected with the second shaft sleeve (491), the first shaft sleeve (49) is fixedly connected with the bottom end of the lifting plate (42), and the second shaft sleeve (491) is fixedly connected with the frame body (491).

4. A valve positioning tool as claimed in claim 3, characterized in that the lifting mechanism (4) further comprises an abutting plate (43), a plurality of abutting plates (43) are mounted at the top ends of the lifting plates (42), a chute (45) with a T-shaped cross section is formed in the abutting plates (43), a U-shaped contact block (44) is mounted at the top ends of the abutting plates (43), a limit bolt (46) is slidably connected to the inside of the chute (45), a gasket (47) is sleeved at the top ends of the limit bolts (46), a fixing nut (48) is arranged at the top ends of the gasket (47), the fixing nut (48), the gasket (47) and the limit bolts (46) are mutually matched to mount the contact block (44) on the abutting plates (43), and the valve body (3) is mounted on the contact block (44).

5. The valve positioning tool according to claim 1, wherein the positioning mechanism (5) comprises slide bars (51), two ends of the valve body (3) are respectively provided with one slide bar (51), the slide bars (51) are connected with the frame body (2) in a sliding mode, one connecting flange (53) is respectively installed at one opposite ends of the two slide bars (51), one end of the connecting flange (53) is connected with a positioning cone (52) in a sliding mode, a buffer spring (58) is abutted between the positioning cone (52) and the connecting flange (53), the positioning cone (52) is conical in shape, and the positioning cone (52) is inserted into a reserved hole groove in the valve body (3).

6. The valve positioning tool according to claim 5, wherein the positioning mechanism (5) further comprises a connecting rod (54), one end of the sliding rod (51) is fixedly connected with the connecting rod (54), one end of the connecting rod (54) is fixedly connected with a toothed bar (55), two toothed bars (55) are in sliding connection with the inside of the shell (1), a first gear (57) is meshed between the two toothed bars (55), a positioning motor (56) is installed in the interior of the shell (1), and a motor shaft of the positioning motor (56) drives the first gear (57) to rotate.

7. A valve positioning tool according to claim 2, wherein the clamping mechanism (6) comprises a supporting frame (61), two supporting frames (61) are fixedly connected to the top end of the lifting plate (42), a deflection plate (62) is rotatably connected between the two supporting frames (61), a plurality of movable clamping blocks (65) are mounted on the bottom side of the deflection plate (62), and the movable clamping blocks (65) are in contact with the valve body (3).

8. The valve positioning tool according to claim 7, wherein the clamping mechanism (6) further comprises a protruding block (63), two protruding blocks (63) are fixedly connected to the bottom end of the lifting plate (42), the two protruding blocks (63) are symmetrically arranged, a second hydraulic rod (64) is rotationally connected between the two protruding blocks (63), a piston rod of the second hydraulic rod (64) is rotationally connected with the deflection plate (62), and the second hydraulic rod (64) drives the deflection plate (62) to deflect and clamp the valve body (3).

9. A valve positioning tool according to claim 3, wherein the switching mechanism (7) comprises a switching motor (71), the switching motor (71) is mounted at the bottom end of the frame body (2), a motor shaft of the switching motor (71) penetrates through the frame body (2) and is fixedly connected with a second gear (72) at the top end, the second gear (72) is fixedly connected with the bottom end of the first shaft sleeve (49), the thickness of the second gear (72) is larger than that of the second gear (72), the second gear (72) is meshed with the third gear (73), and the switching motor (71) drives the lifting plate (42) to deflect by means of the second gear (72) and the third gear (73).

10. The valve positioning tool and the valve processing method according to any one of claims 1-9, comprising the steps of:

a: firstly, mounting a shell (1) on a machine tool to be processed, putting a valve body (3) to be processed into a frame (2), and placing the valve body at the top end of a lifting mechanism (4);

b: then starting a lifting mechanism (4) to lift the height of the valve body (3) so that the horizontal height of the valve body (3) corresponds to the height position of the positioning mechanism (5);

c: starting a positioning mechanism (5), and precisely identifying and finding out the reference position of the valve body (3) through the positioning cone (52) in the inner hole of the positioning cone (52) for positioning;

d: then, the lifting mechanism (4) continuously moves to be in contact with the valve body (3) according to the height of the positioned valve body (3), the clamping mechanism (6) is started to clamp the valve body (3), and the positioning mechanism (5) is removed after clamping is finished;

e: finally, after the end face of the current valve body (3) is required to be machined, the switching mechanism (7) is started to switch the angle of the valve body (3), and other unprocessed end faces of the valve body (3) are switched to the outside of the shell (1) for machining.