CN217192660U - Fixing assembly for machining valve body accessories - Google Patents

Abstract

The utility model provides a valve body accessory processing is with fixed subassembly belongs to valve body accessory processing technical field, including three support piece, a plurality of cushion and a plurality of connecting piece, a plurality of connecting pieces are connected with three support piece on to it is fixed with a plurality of cushions, through the removal regulation of three jack catch, three support piece removes thereupon, and then the tight space of clamp that a plurality of cushions enclose adjusts thereupon, so that be suitable for the accessory of pressing from both sides tight different external diameters, cushion and accessory butt side and accessory appearance adaptation. The utility model provides a pair of valve body accessory processing is with fixed subassembly compares in current with the jack catch presss from both sides tight fixed accessory, and the increase is to the contact range of accessory, and it is tight firm to press from both sides, improves and presss from both sides tight stability, enlarges the clamping range, can press from both sides tightly to big external diameter accessory, prevents that the accessory from removing or crooked man-hour, helps promoting accessory processingquality and machining precision.

Description

Fixing assembly for machining valve body accessories

Technical Field

The utility model belongs to the technical field of valve body accessory processing, more specifically say, relate to a valve body accessory processing is with fixed subassembly.

Background

The valve body fittings are used or assembled on the valve body, some valve body fittings are of a revolving body structure, when the fittings are machined on a machine tool, the machining requirements are that the insides of the fittings are dug into hole-shaped round grooves or hollow types, and the stability of the fittings is kept in the machining process, so that the machining requirements can be met and the machining quality is met. Because this kind of accessory is the round platform type or similar round platform type usually, along the axial direction of this accessory promptly, one end external diameter is great, the other end external diameter is less, because three-jaw or four-jaw chuck that uses on the current lathe, the great one end of external diameter on the clamping fitting usually mainly, then the less one end of external diameter or the middle part of accessory on the accessory and chuck contactless, because the area of contact is less between jack catch and the accessory, the axial length of accessory is longer, consequently can have and press from both sides the fastening insecure to the accessory, the accessory phenomenon of skew or removal or vibrations easily takes place during processing, lead to accessory processingquality to descend. In addition, when a valve body fitting having a large size and a large outer diameter is mounted on a chuck of a machine tool, the conventional chuck is not easy to clamp and fix the fitting.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a valve body accessory processing is with fixed subassembly aims at solving the lathe chuck and presss from both sides tight fixed insecure technical problem to being round platform form valve body accessory.

In order to achieve the above object, the utility model adopts the following technical scheme: the fixing component for machining the valve body fitting comprises a plurality of supporting pieces, a plurality of cushion blocks and a plurality of connecting pieces, wherein the supporting pieces are respectively used for being matched and connected with a plurality of clamping jaws of a chuck on a machine tool; the plurality of cushion blocks are respectively connected to the inner side surfaces of the plurality of supporting pieces, the plurality of cushion blocks are respectively used for being matched and abutted with the outer wall of an accessory, at least one cushion block is abutted to the middle part of the outer wall of the accessory, the plurality of cushion blocks surround a clamping space suitable for clamping the accessory to be processed, and the range of the clamping space is adjusted by means of a plurality of clamping claws; the connecting pieces are respectively connected to the supporting pieces and the cushion blocks, and are used for fixing the cushion blocks to the supporting pieces.

In a possible implementation manner, the valve body fitting machining fixing assembly further comprises a plurality of extension pieces, the extension pieces are detachably connected to the support pieces respectively and located at one ends far away from the clamping jaws, the extension pieces are suitable for abutting against the outer wall of the fitting, and at least one of the extension pieces abuts against the middle of the outer wall of the fitting.

In a possible implementation manner, an extension pad suitable for abutting against the outer wall of the accessory is connected to the inner side face of the extension piece, and the shape of the extension pad is matched with the appearance of the accessory and is detachably connected with the extension piece.

In one possible implementation, an extension connector is connected to the extension member, the extension connector being adapted to connect and secure the extension pad to the extension member.

In a possible implementation manner, one end of the support far away from the clamping jaw is provided with a first wedge-shaped groove, one end of the extension piece, which is used for being in contact with the support, is provided with a second wedge-shaped groove, a first wedge can be inserted into a space enclosed by the second wedge-shaped groove and the first wedge after being aligned, and the first wedge is suitable for locking the extension piece to the support.

In a possible implementation, the support comprises a fixing portion and a clamping portion, the fixing portion is used for being detachably connected to the clamping jaw and moving along with the clamping jaw; the clamping part can be detachably connected with the fixing part and is suitable for abutting against a clamping accessory along with the movement of the clamping jaw, the cushion block and the connecting piece are connected with the clamping part, the clamping part and the fixing part are combined to form an L shape, and the length direction of the clamping part is defined along the axial direction of the accessory.

In a possible implementation, be used for on the fixed part with the interval is equipped with a plurality of third wedge grooves on the terminal surface that clamping part connects, be used for on the clamping part with be equipped with the fourth wedge groove on the terminal surface that the fixed part is connected, the fourth wedge groove with the second wedge of pegging graft in the space that encloses after the alignment of third wedge groove, the second wedge is suitable for locking clamping part extremely on the fixed part, fourth wedge groove and different positions the alignment of third wedge groove passes through the second wedge is connected, in order to be suitable for the regulation press from both sides tight spatial scope.

In a possible implementation mode, the outer end of the fixing part can be dismantled and be connected with the auxiliary part along the moving direction of the jack catch, on the fixing part with the one end that the clamping part is connected is for keeping away from the one end of jack catch, on the auxiliary part keep away from the jack catch one end with on the fixing part keep away from the one end parallel and level of jack catch, but clamping part adapter coupling in the auxiliary part, in order to adjust press from both sides tight space range.

In a possible implementation manner, a plurality of fifth wedge-shaped grooves are formed in the auxiliary element at intervals at one end far away from the clamping jaws, and the fourth wedge-shaped grooves can be aligned with the fifth wedge-shaped grooves at different positions and connected through the second wedge so as to lock the clamping part to the auxiliary element.

In a possible implementation, the pad has a plurality of cushions on the side for abutment with the fitting, the cushions being adapted to cushion the pressure of the pad on the fitting.

The utility model provides a pair of valve body accessory processing lies in with fixed subassembly's beneficial effect: compared with the prior art, the utility model relates to a valve body accessory processing is with fixed subassembly includes a plurality of support piece, a plurality of cushion and a plurality of connecting piece, a plurality of connecting pieces are connected with a plurality of support piece on, and it is fixed with a plurality of cushion, removal through a plurality of jack catchs is adjusted, a plurality of support piece remove thereupon, then the tight space of clamp that a plurality of cushion enclose adjusts thereupon, so that be suitable for the accessory of pressing from both sides tight different external diameters, cushion and accessory butt side and accessory appearance adaptation, compare in the current tight fixed accessory of clamp with the jack catch clamp, the increase is to the contact range of accessory, it is tight to press from both sides, improve and press from both sides tight stability, enlarge and press from both sides tight scope, can press from both sides tight to big external diameter accessory, prevent to remove or skew man-hour, help promoting accessory processingquality and machining precision.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structural cross-sectional view of a fixing assembly for machining a valve body fitting according to an embodiment of the present invention in a state of clamping the valve body fitting (a schematic view of a connection structure of the fixing assembly of the present invention and four claws used on a machine tool);

fig. 2 is a perspective view of a valve body fitting structure provided in an embodiment of the present invention;

FIG. 3 is a schematic view of one of the support members of FIG. 1 in connection with a jaw;

FIG. 4 is a schematic view of the connection structure of the supporting member and the extension member shown in FIG. 3;

FIG. 5 is a schematic view of the connection structure of the supporting member, the spacer and the connecting member shown in FIG. 4;

FIG. 6 is a schematic view of the support structure of FIG. 5;

fig. 7 is a schematic view of a connection state between one of the supporting members and the clamping jaws of the fixing assembly for machining the valve body fitting according to the embodiment of the present invention;

FIG. 8 is a schematic view of the embodiment of FIG. 7 lacking the elongate member;

FIG. 9 is a schematic view of the auxiliary member of FIG. 7;

fig. 10 is a schematic view of a cushion block structure of a fixing assembly for machining a valve body fitting according to another embodiment of the present invention.

Description of reference numerals:

1. a support member; 11. a fixed part; 12. a clamping portion; 13. a third wedge groove; 14. a fourth wedge groove; 15. a second wedge; 16. an auxiliary member; 17. a fifth wedge groove; 18. an avoidance groove; 2. cushion blocks; 21. a cushion pad; 3. a connecting member; 4. a claw; 5. an extension member; 6. an extension pad; 7. an extension connector; 8. a first wedge groove; 9. a second wedge-shaped groove; 10. a first wedge.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 10, a fixing assembly for machining a valve body fitting according to the present invention will now be described. The fixing assembly for machining the valve body fittings comprises a plurality of supporting pieces 1, a plurality of cushion blocks 2 and a plurality of connecting pieces 3, wherein the supporting pieces 1 are respectively used for being connected with a plurality of clamping jaws 4 of a chuck on a machine tool in an adaptive mode; the plurality of cushion blocks 2 are respectively connected to the inner side surfaces of the plurality of supporting pieces 1, the plurality of cushion blocks 2 are all used for being in adaptive butt joint with the outer wall of the accessory, at least one cushion block 2 is in butt joint with the middle part of the outer wall of the accessory, the plurality of cushion blocks 2 enclose a clamping space suitable for clamping the accessory to be processed, and the range of the clamping space is adjusted by means of the plurality of clamping jaws 4; the connecting members 3 are respectively connected to the supporting members 1 and the cushion blocks 2, so as to fix the cushion blocks 2 to the supporting members 1.

Compared with the prior art, the fixing component for processing the valve body fittings provided by the utility model comprises a plurality of supporting pieces 1, a plurality of cushion blocks 2 and a plurality of connecting pieces 3, wherein the connecting pieces 3 are connected with the supporting pieces 1, a plurality of cushion blocks 2 are fixed, a plurality of supporting pieces 1 move along with the movement adjustment of a plurality of claws 4, the clamping space surrounded by the cushion blocks 2 is adjusted along with the adjustment so as to be suitable for clamping accessories with different outer diameters, the abutting side surfaces of the cushion blocks 2 and the accessories are matched with the appearance of the accessories, and compared with the existing method that the accessories are clamped and fixed by the clamping jaws 4, the contact range of the accessories is enlarged, the clamping is firm, the clamping stability is improved, the clamping range is enlarged, the large-outer-diameter accessories can be clamped, the moving or deflection is prevented during processing, and the processing quality and the processing precision of the accessories are improved.

If a three-jaw chuck is used on the processing machine, three supporting pieces 1 are used, six cushion blocks 2 and twelve connecting pieces 3 are used in a matching way, wherein two connecting pieces 3 are connected with one cushion block 2, and two cushion blocks 2 are connected on one supporting piece 1, as shown in the figure.

Connecting piece 3 is connecting piece 3 such as bolt or screw, the interval is equipped with a plurality of through-holes on support piece 1, a plurality of connecting pieces 3 respectively one-to-one passes a plurality of through-holes, be equipped with the internal thread in the through-hole, the both ends of connecting piece 3 are located support piece 1's both sides respectively and keep stretching out the form, the one end of being connected with cushion 2 on connecting piece 3 is pegged graft in the blind hole on cushion 2, through revolving connecting piece 3, adjustable connecting piece 3 is in the position in the through-hole, and then the position that 3 ejector pad 2 removed of adjusting connecting piece, wherein the tip of connecting piece 3 is at the blind hole internal rotation, the rotatory 2 translations of ejector pad in limit. Before connecting piece 3 is not connected with support piece 1, cushion 2 also is not connected with support piece 1, after in the through-hole with connecting piece 3 spiro union (the through-hole also can be regarded as the screw), and guarantee that the inner of connecting piece 3 stretches out the through-hole, can install cushion 2 to connecting piece 3 tip (make connecting piece 3 tip peg graft in the blind hole) this moment, rethread screwed connection 3's outer end, adjustable clamp tight spatial dimension, also can press from both sides tight spatial dimension through the position control of regulation jack catch 4.

In the concrete application, support piece 1 with proper specification should be rationally selected according to specification isoparametric of the valve body accessory of processing, and then select and use cushion 2 with proper specification, install cushion 2 to connecting piece 3, the tight space of clamp in this embodiment is cylindrical, the space that a plurality of cushion 2 enclose, the cylindrical height is along the axial of accessory, the scope that the outer end that is located the cushion 2 at support piece 1 both ends encloses. At least one cushion 2 can with accessory middle part butt, also can understand to have at least one cushion 2 and accessory middle part butt on a plurality of support piece 1, the accessory middle part be real accessory middle part or intermediate position, can understand in this embodiment to be the accessory middle part except the position of accessory tip, other positions, or can understand as the position that is close to the accessory middle part, the utility model aims at comparing in the contact range of current jack catch 4 with the accessory, the increase is with the contact range of accessory, then the accessory is more stable by the course of working, can not rock, improves accessory machining precision and processingquality.

In order to increase the contact range or area between the cushion block 2 and the fitting, in some embodiments, referring to fig. 1, 3-4 and 10, the valve body fitting processing fixing assembly further includes a plurality of extension pieces 5, the plurality of extension pieces 5 are detachably connected to the plurality of supporting pieces 1 respectively and are located at one ends far away from the claws 4, the extension pieces 5 are adapted to abut against the outer wall of the fitting, and at least one of the extension pieces 5 abuts against the middle part of the outer wall of the fitting. On the basis of the contact area of the original cushion block 2 and the accessory, the contact range of the accessory can be enlarged again by using the extension piece 5, the larger the contact range is, the more stable the clamping of the accessory is, and the processing quality of the accessory is higher. If the accessory with longer axial length is machined, the extension piece 5 is needed, in actual operation, the extension piece 5 is easily connected with the support piece 1, the extension piece is installed when needed and can be detached when not needed, and meanwhile, the clamping stability of the support piece 1 on the accessory cannot be influenced. By using the extension piece 5, the middle part of the fitting can be clamped, which also does not interfere with the machining on the machine tool, but also the fitting can be clamped.

Specifically, the extension piece 5 is equivalent to an extension of a contact position of the support piece 1 to the fitting in the axial direction of the fitting, so that the contact area or range with the fitting is increased, and the processing stability of the fitting is improved. Present through three jack catch 4 or four jack catch 4 clamp tightly the accessory, especially the longer accessory of axial length, the defect that exists is less with the area of contact of accessory, and through the utility model discloses just can overcome this defect, improve processingquality and precision.

In some embodiments, referring to figures 1, 3-4 and 10, an extension pad 6 adapted to abut an outer wall of the fitting is attached to an inner side of the extension 5, the extension pad 6 being shaped to conform to the outer shape of the fitting and being removably attached to the extension 5. If the accessory is the round platform type, then a side design of extension pad 6 becomes the inclined plane type, and extension pad 6 can fully contact with the accessory outer wall, increases contact range or area, and extension piece 5 is connected the back with support piece 1, can regard both as integral type structure, and extension pad 6 contact supports and leans on the accessory outer wall. The extension pad 6 is removably attached to the extension 5 and may be attached to the extension 5 when desired.

In some embodiments, referring to fig. 1, 3-4 and 10, an extension connector 7 is coupled to the extension piece 5, the extension connector 7 being adapted to couple and secure the extension pad 6 to the extension piece 5. The extension connecting piece 7 has the same structure as the connecting piece 3, all are bolts or screws, etc., a screw hole is also arranged on the extension piece 5, the extension connecting piece 7 penetrates into the screw hole and is in screw connection with the screw hole, the inner end of the extension connecting piece 7 is inserted into a blind hole on the extension pad 6, and the contact pressure between the extension pad 6 and the accessory can be adjusted by screwing the extension connecting piece 7, so that the accessory is clamped. Wherein the inner end of the extension link 7 rotates within the blind hole of the extension pad 6 during adjustment.

In order to realize the detachable connection of the extension piece 5 and the support 1, in some embodiments, referring to fig. 1 to 8, an end of the support 1 away from the claw 4 is provided with a first wedge-shaped groove 8, an end of the extension piece 5 for contacting with the support 1 is provided with a second wedge-shaped groove 9, the second wedge-shaped groove 9 is aligned with the first wedge-shaped groove 8 and encloses a space in which a first wedge 10 can be inserted, and the first wedge 10 is suitable for locking the extension piece 5 to the support 1. The first wedge 10 penetrates into and out of the side part of the support member 1, and the first wedge 10 can be inserted into a space enclosed by the first wedge groove 8 and the second wedge groove 9 after being aligned, so that the support member 1 and the extension member 5 can be connected and fixed after being inserted. When the first wedge 10 is removed, the extension 5 can be removed from the support 1.

In some embodiments, referring to fig. 7 to 8, the supporting member 1 includes a fixing portion 11 and a clamping portion 12, the fixing portion 11 is configured to be detachably connected to the jaw 4 and move with the jaw 4; the clamping portion 12 is detachably connected to the fixing portion 11 and adapted to abut against a clamping fitting as the jaws 4 are moved, the head block 2 and the connecting member 3 are both connected to the clamping portion 12, the clamping portion 12 and the fixing portion 11 are combined to form an L-shape, defining the length direction of the clamping portion 12 as being along the axial direction of the fitting. The supporting member 1 can be an integral body, or a combination of two components, and after the fixing portion 11 and the clamping portion 12 are connected, the connecting position of the clamping portion 12 on the fixing portion 11 can be adjusted, so that the clamping space range can be adjusted on the supporting member 1. The extension 5 is located in the longitudinal direction of the clamp 12.

In some embodiments, referring to fig. 7 to 8, a plurality of third wedge grooves 13 are spaced apart from one end surface of the fixing portion 11 for connecting with the clamping portion 12, a fourth wedge groove 14 is disposed on one end surface of the clamping portion 12 for connecting with the fixing portion 11, a second wedge 15 is inserted into a space enclosed by the fourth wedge groove 14 and the third wedge grooves 13 after being aligned, the second wedge 15 is adapted to lock the clamping portion 12 to the fixing portion 11, and the fourth wedge groove 14 is aligned with the third wedge grooves 13 at different positions and connected through the second wedge 15 so as to be adapted to adjust a range of a clamping space. The connection and fixation manner of the fourth wedge groove 14 and the third wedge groove 13 is the same as the connection and fixation manner of the first wedge groove 8 and the second wedge groove 9, and the description is omitted here. In the present embodiment, there are two third wedge grooves 13, and the fourth wedge groove 14 may be connected in alignment with one of the third wedge grooves 13.

For clamping a fitting with a larger outer diameter, in order to increase the clamping stability of the fitting, in some embodiments, referring to fig. 7 to 9, an auxiliary member 16 is detachably connected to an outer end of the fixing portion 11 in the moving direction of the jaws 4, an end of the fixing portion 11 connected to the clamping portion 12 is an end away from the jaws 4, an end of the auxiliary member 16 away from the jaws 4 is flush with an end of the fixing portion 11 away from the jaws 4, and the clamping portion 12 is fittingly connected to the auxiliary member 16 to adjust the clamping space range. The auxiliary piece 16 can enlarge the clamping range of the clamping part 12 to the accessory, increase the clamping space range and meet the clamping requirement of the accessory. For the tight mode of clamp of three-jaw chuck or four-jaw chuck among the prior art, the utility model discloses a press from both sides tight stability height, big external diameter accessory can not take place crooked or rock in the course of working, does not influence processingquality.

In some embodiments, referring to fig. 7 to 9, a plurality of fifth wedge grooves 17 are spaced apart from one end of the auxiliary member 16 away from the jaws 4, and the fourth wedge grooves 14 can be aligned with the fifth wedge grooves 17 at different positions and connected by the second wedge 15 to lock the clamping portion 12 to the auxiliary member 16. The auxiliary member 16 in this embodiment corresponds to an extension of the fixing portion 11 in the radial direction of the fitting, and the clamping portion 12 is connected to the auxiliary member 16 to expand the range of the clamping space. Two fifth wedge grooves 17 are formed in the auxiliary member 16, and the clamping portion 12 is fixedly coupled to the auxiliary member 16 by the second wedge 15. The auxiliary element 16 can be removed when it is not needed. Wherein the auxiliary element 16 is also connected to the anchoring portion 11 by means of a wedge-shaped groove and wedge, or, with reference to the clamping portion 12, to the anchoring portion 11.

In some embodiments, referring to fig. 10, the cushion block 2 has a plurality of cushions 21 on the side for abutting against the fitting, the cushions 21 adapted to cushion the pressure of the cushion block 2 on the fitting. The cushions 21 can be contacted with each other or not, the cushions 21 are adhered to the cushion block 2, and can be adhered to the cushion block 2 when in use, and the thickness of the cushions 21 is less than that of the cushion block 2 or is one third of that of the cushion block 2. Can prevent behind the use blotter 21 at the in-process of adjusting jack catch 4, pressure is great in the twinkling of an eye to the outer wall of accessory, causes the damage etc. to the accessory outer wall, after blotter 21 butt on the accessory outer wall, adjusts jack catch 4 once more, can make cushion 2 stably compress tightly the accessory, then the accessory can not take place to rock by the course of working, does not influence processingquality.

Specifically, the support member 1 is provided with an avoiding groove 18 on one end surface for being connected with the jaw 4, the avoiding groove 18 is suitable for avoiding or accommodating locking members such as bolts for connecting a machine tool on the jaw 4, the support member 1 can be tightly attached to the jaw 4 after being mounted on the jaw 4, the two are stably connected, and the connection strength is high.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a valve body accessory processing is with fixed subassembly which characterized in that includes:

the supporting pieces are respectively used for being matched and connected with a plurality of clamping jaws of a chuck on the machine tool;

the plurality of cushion blocks are respectively connected to the inner side surfaces of the plurality of supporting pieces, the plurality of cushion blocks are all used for being matched and abutted with the outer wall of an accessory, at least one cushion block abuts against the middle part of the outer wall of the accessory, the plurality of cushion blocks surround a clamping space suitable for clamping the accessory to be processed, and the range of the clamping space is adjusted by means of a plurality of clamping claws; and

and the connecting pieces are respectively connected to the supporting pieces and the cushion blocks and are used for fixing the cushion blocks to the supporting pieces.

2. A valve body fitting machining fixture assembly as claimed in claim 1 further comprising a plurality of extensions removably attached to a plurality of said supports at respective ends thereof remote from the jaws, said extensions adapted to abut an outer wall of the fitting, at least one of said extensions abutting a middle portion of the outer wall of the fitting.

3. The valve body fitting machining fixing assembly as claimed in claim 2, wherein an extension pad adapted to abut against an outer wall of the fitting is connected to an inner side surface of the extension piece, and the extension pad is shaped to fit the fitting outer shape and is detachably connected to the extension piece.

4. A valve body fitting processing fixture assembly of claim 3 wherein an extension connector is attached to said extension member, said extension connector adapted to attach and secure said extension pad to said extension member.

5. A valve body fitting machining fixture assembly as claimed in claim 2 wherein said support member has a first wedge groove at an end thereof remote from said jaw, said extension member has a second wedge groove at an end thereof for contacting said support member, said second wedge groove being aligned with said first wedge groove to receive a first wedge therein, said first wedge being adapted to lock said extension member to said support member.

6. A valve body fitting machining fixture assembly of claim 1 wherein said support member comprises:

the fixing part is detachably connected with the clamping jaw and moves along with the clamping jaw; and

the clamping part is detachably connected to the fixing part and is suitable for abutting against a clamping accessory along with the movement of the clamping jaw, the cushion block and the connecting piece are connected to the clamping part, the clamping part and the fixing part are combined to form an L shape, and the length direction of the clamping part is defined along the axial direction of the accessory.

7. The fixing component for machining the valve body fitting as claimed in claim 6, wherein a plurality of third wedge grooves are formed in an end face, used for being connected with the clamping portion, of the fixing portion at intervals, a fourth wedge groove is formed in an end face, used for being connected with the fixing portion, of the clamping portion, a second wedge is inserted into a space defined by the fourth wedge groove and the third wedge grooves after being aligned, the second wedge is suitable for locking the clamping portion to the fixing portion, and the fourth wedge groove is aligned with the third wedge grooves at different positions and connected through the second wedge so as to be suitable for adjusting the range of the clamping space.

8. The valve body fitting machining fixing assembly according to claim 7, wherein an auxiliary member is detachably connected to an outer end of the fixing portion in a moving direction of the jaw, an end of the fixing portion connected to the clamping portion is an end away from the jaw, an end of the auxiliary member away from the jaw is flush with an end of the fixing portion away from the jaw, and the clamping portion is fittable to the auxiliary member to adjust the clamping space range.

9. A valve body fitting machining fixture assembly as claimed in claim 8 wherein a plurality of fifth wedge grooves are spaced apart on an end of said auxiliary member remote from said jaws, said fourth wedge grooves being alignable with said fifth wedge grooves at different locations and connected by said second wedge to lock said clamp portion to said auxiliary member.

10. The valve body fitting machining fixing assembly of claim 1, wherein a plurality of cushion pads are provided on a side of the cushion block for abutting against the fitting, the cushion pads being adapted to cushion pressure of the cushion block on the fitting.

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