CN109465663B

CN109465663B - Clamp tool for milling vortex plate and use method

Info

Publication number: CN109465663B
Application number: CN201811645965.0A
Authority: CN
Inventors: 梁稳; 袁佳山; 徐波
Original assignee: Nanjing Aotecar New Energy Technology Co ltd; NANJING AOTEJIA CHANGHENG CASTING CO Ltd; Ma'anshan Aotejia Electromechanical Co ltd
Current assignee: Nanjing Aotecar New Energy Technology Co ltd; NANJING AOTEJIA CHANGHENG CASTING CO Ltd; Ma'anshan Aotejia Electromechanical Co ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2023-08-29
Anticipated expiration: 2038-12-29
Also published as: CN109465663A

Abstract

The invention discloses a fixture tool for milling a vortex disc and a using method thereof, and belongs to the technical field of milling fixture tools. The expansion part comprises a first reference seat, a second reference seat and a clamping block, and the blank is clamped by the clamping block; the positioning part comprises a claw, a first positioning pin and a second positioning pin which are used for positioning; the first positioning plate comprises a first positioning plate groove and a second positioning plate groove which are distributed at equal intervals in a staggered manner; the second positioning plate comprises a first positioning plate hole and a second positioning plate hole which are distributed in an equidistant and staggered manner; the positioning plate grooves correspond to the positioning plate holes in position. The actuating part comprises a cylinder, a first fixed plate, a second fixed plate and a connecting rod mechanism, the connecting rod mechanism is connected with the clamping jaw through a piston rod of the cylinder, clamping from the bottom of the vortex plate is achieved, and the influence of cutting force and clamping example on machining errors of a machining surface is eliminated.

Description

Clamp tool for milling vortex plate and use method

Technical Field

The invention belongs to the technical field of milling fixture tools, and particularly relates to a fixture tool for milling a vortex disc and a use method thereof.

Background

The scroll compressor is a compressor with compressible volume comprising one fixed involute scroll and one eccentric orbiting scroll. The most important component is the vortex plate, the compressor has higher precision requirement on the vortex plate, and the machining error must be kept in a reasonable range to produce a qualified vortex plate.

Most of the existing vortex plate milling clamps adopt hydraulic or pneumatic or electric chucks, and the three chucks are used for clamping the bottom of the vortex plate, so that the clamping mode has the defects: when the cutter is milling the blank of the vortex disc, the cutter can apply larger cutting force to the inner wall or the outer wall of the vortex disc to cut allowance, the blank has a trend of moving along with the cutter, and the chuck applies acting force to the bottom of the vortex disc, so that larger machining errors exist on the machining surface of the blank of the vortex disc. And most of the existing clamps cannot realize quick conversion of clamp tools between the shapes of the bottoms of different vortex plates, and the clamps need to be replaced again for processing, so that the operation is inconvenient and the production efficiency is low. The need for a factory to produce a variety of scroll bottom structures cannot be met.

The problems are urgently needed to be solved, so that the clamp tool for milling the vortex plate and the using method are provided.

Disclosure of Invention

The method aims to solve the defects in the prior art, is used for further improving the production quality of the vortex plate, improving the efficiency, reducing the economic loss caused by large production and processing errors of enterprises, and can also realize the production requirements of factories on different structures of the vortex plate.

In order to achieve the above purpose, the present invention adopts the following scheme: the fixture tool for milling the vortex plate comprises an expanding part, a positioning part and an executing part.

The expansion part comprises a first reference seat, a second reference seat and a plurality of clamping blocks; a connecting rod is arranged between the first reference seat and the second reference seat and is fixedly connected into a whole; a stepped hole is formed in the middle of the first reference seat; the outer sides of the bottoms of the plurality of clamping blocks are provided with protrusions which are rotationally connected to the inside of the stepped holes; the sections of the bottoms of the inner side walls of the plurality of clamping blocks are arc-shaped; the top fixedly connected with fixture block of a plurality of press from both sides tight piece, the inside wall of fixture block is equipped with the tooth line.

The positioning part is positioned at the inner side of the clamping block and comprises a first positioning plate, a plurality of clamping claws, a first positioning pin and a second positioning plate; the first positioning plate is fixedly connected with the second positioning plate; the section of the bottom of the outer side wall of the second positioning plate is arc-shaped and is matched with the inner side wall of the clamping block; a positioning plate groove is formed in the first positioning plate; a positioning plate hole is formed in the second positioning plate; the positioning plate grooves correspond to the positions of the positioning plate holes; the clamping claws are movably connected in the holes of the positioning plate; a positioning groove is formed in the middle of the first positioning plate; a positioning hole is formed in the middle of the second positioning plate; the positioning groove and the positioning hole are matched with the first positioning pin; the bottom of the second positioning plate is also provided with a second positioning pin;

the executing part comprises an air cylinder, a first fixed plate and a second fixed plate; the air cylinder is a secondary air cylinder; the cylinder is fixedly connected to the second reference seat; the second-stage piston rod of the air cylinder is fixedly connected with a first fixing plate and a second fixing plate from bottom to top in sequence; a first positioning plate and a first positioning pin are sequentially and fixedly connected with a first-stage piston rod of the air cylinder from bottom to top; a plurality of first connecting plates are distributed on the outer side wall of the first fixing plate at equal intervals; one side of the first connecting plate is provided with a first connecting rod, one end of the first connecting rod is rotationally connected with a first horizontal plate, and the other end of the first connecting rod is rotationally connected with the outer wall of one side of the first connecting plate; a plurality of second connecting plates are distributed on the outer side wall of the second fixing plate at equal intervals; one side of the second connecting plate is provided with a second connecting rod, one end of the second connecting rod is rotationally connected with a second horizontal plate, and the other end of the second connecting rod is rotationally connected with the outer wall of one side of the second connecting plate; the first horizontal plate and the second horizontal plate are both movably connected inside the positioning plate holes; the first horizontal plate and the second horizontal plate are respectively connected with corresponding clamping claws in a matched mode.

Further, the positioning plate grooves are provided with two groups, namely a first positioning plate groove and a second positioning plate groove; the opening directions of the first locating plate groove and the second locating plate groove are opposite, and the first locating plate groove and the second locating plate groove are distributed in an equidistant and staggered mode;

further, two groups of positioning plate holes are formed, and the two groups of holes are respectively a first positioning plate hole and a second positioning plate hole; the opening directions of the first positioning plate holes and the second positioning plate holes are opposite, and the first positioning plate holes and the second positioning plate holes are distributed at equal intervals in a staggered mode.

Further, the widths of the first locating plate hole and the second locating plate hole are larger than the widths of the first locating plate groove and the second locating plate groove.

Further, the first locating plate groove and the second locating plate groove are internally provided with track grooves matched with the first horizontal plate and the second horizontal plate respectively.

Further, T-shaped grooves are formed in the first horizontal plate and the second horizontal plate, and teeth are arranged on the inner walls of the T-shaped grooves.

Further, the clamping jaw comprises a fixed block and a base plate; the fixed block is fixedly connected with the base plate through a bolt rod, and a sand grinding layer is arranged at the top of the base plate.

Further, the top of the backing plate is matched with the inner wall of the T-shaped groove.

Further, the rotation direction of the first connecting rod is opposite to the rotation direction of the second connecting rod.

Further, torsion springs are arranged between the clamping blocks and the first reference seat.

The invention also discloses a using method of the fixture tool for milling the vortex plate, which comprises the following steps:

step one: the standard circular ring is placed between the fixed blocks on the first horizontal plate and the second horizontal plate, the first horizontal plate moves towards the inner side of the first positioning plate hole through upward movement of the adjusting cylinder, the second horizontal plate moves towards the outer side of the second positioning plate hole, and the standard circular ring is used for alignment and positioning through clamping;

step two: the cylinder is regulated to enable the clamping jaw of the cylinder to be positioned at a position required by design, and a blank piece with the bottom processed is placed above the second positioning plate, so that a shaft hole at the bottom of the blank piece is matched with the first positioning pin;

step three: the adjusting cylinder moves downwards, and the first positioning plate and the second positioning plate move downwards along with the adjusting cylinder, so that the clamping blocks clamp the blank;

step four: continuing to adjust the cylinder to move downwards, and respectively moving the fixed blocks on the first horizontal plate and the second horizontal plate to the inner side and the outer side to clamp the cylindrical hole at the bottom of the blank;

step five: starting a milling machine to mill the blank, moving an air cylinder of the milling machine upwards to an original position after finishing milling, and taking down the machined blank; reinstalling the blank, and repeating the second to fifth steps.

Compared with the prior art, the invention can obtain the following technical effects:

(1) The invention is provided with a first reference seat which is hinged with a clamping block, and a torsion spring is arranged between the clamping block and the first reference seat. The clamping block clamps the outer side of the vortex plate and automatically returns to the initial position, so that the positioning accuracy of the clamping block can be effectively ensured, and larger machining errors are prevented when subsequent blanks are machined.

(2) The first locating pin, the first fixed disk and the second locating disk are fixed with the piston rod of the air cylinder, the clamping function of the clamping jaw can be achieved through adjusting the piston rod of the air cylinder, and the influence of the clamping block and the cutting force on the machining error of the blank is eliminated when the blank is milled. The first locating pin can fixedly connect the first locating plate and the second locating plate with the piston rod, and limit the degree of freedom of the vortex plate.

(3) The outer side wall of the second locating plate is provided with an arc matched with the inner side wall of the clamping block, the piston rod is adjusted to move downwards, and the piston rod and the arc interact with each other to enable a clamping block of the second locating plate to clamp the outer wall of the vortex disc, so that the outer side of a blank piece is effectively fixed.

(4) The locating plate hole width is greater than the width of locating plate groove, can be with the effectual restriction of jack catch in the locating plate hole, prevent that the jack catch from stretching out overlength, effectual assurance clamping effect and the movable range of piston rod.

(5) The jack catch is equipped with fixed block and backing plate, and the backing plate is fixed and first horizontal plate and second horizontal plate separation through the bolt pole with the fixed plate, and then is suitable for the vortex dish of different bottom structures.

(6) The first connecting rod and the second connecting rod are opposite in steering, and the claw is moved inwards or outwards through movement of the piston rod so as to clamp the blank, so that the influence of cutting force and clamping force on a machining surface is eliminated.

(7) The first locating plate grooves and the second locating grooves are distributed in an equidistant and staggered mode, strength of the first locating plate can be guaranteed, clamping is convenient, and after the first locating plate and the second locating plate are fixed, the first horizontal plate and the second horizontal plate are effectively fixed. The first locating plate holes and the second locating plate holes are distributed in an equidistant and staggered mode, the first locating plate holes and the second locating plate holes correspond to the first locating plate grooves and the second locating plate grooves, the first horizontal plate and the second horizontal plate are respectively fixed with corresponding clamping claws, the clamping claws are controlled to freely move in the locating plate holes, the force applied to the bottom of the vortex plate can be effectively dispersed, and large machining errors caused by concentration of one point are avoided.

(8) The cylinder adopts the second grade cylinder, through the motion of a second grade piston rod, accomplishes the work of clamp frock to the clamp of blank piece and inside clamp in proper order. The outside of blank is pressed from both sides tightly earlier, can realize pressing from both sides the automatic centering function of clamp block, and then guarantees the precision that the clamping jaw of inside pressed from both sides the clamp of blank bottom structure, and reverse process presss from both sides tight blank and can increase machining error.

(9) In the use method, the clamping block and the clamping jaw are milled for one time, so that the roundness of the clamping block and the clamping jaw is ensured, the influence of the clamp on the machining precision of the blank is greatly reduced, and the machining precision is further improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of a positioning portion according to the present invention;

FIG. 3 is a schematic diagram of an actuator according to the present invention;

FIG. 4 is a cross-sectional view of a positioning portion of the present invention;

FIG. 5 is a cross-sectional view of the locating plate slot, locating plate hole and pawl of the present invention;

FIG. 6 is a cross-sectional view of the post-installation clamping surface of the present invention;

fig. 7 is a cross-sectional view of the mounting blank of the present invention during processing.

In the figure: 1. the second datum seat, 2, the first datum seat, 3, the clamping block, 4, the connecting rod, 5, the cylinder, 6, the first locating plate hole, 7, the second locating plate hole, 8, the first locating pin, 9, the second locating plate, 10, the constant head tank, 11, the first locating plate, 12, the first locating plate groove, 13, the second locating plate groove, 14, the locating hole, 15, the fixture block, 16, the first connecting rod, 17, the first horizontal plate, 18, the first connecting plate, 19, the first fixed plate, 20, the second connecting rod, 21, the second fixed plate, 22, the second connecting plate, 23, the second horizontal plate, 24, the fixed block, 25, the backing plate, 26 and the second locating pin.

Detailed Description

The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1:

as shown in fig. 1 to 6, the jig tool for milling the scroll comprises an expanding portion, a positioning portion and an executing portion.

The expansion part comprises a first reference seat 2, a second reference seat 1 and six clamping blocks 3; the first reference seat 2 and the second reference seat 1 are connected into a whole through four connecting rods 4 through bolts. The middle part of the first reference seat 2 is provided with a second-order stepped hole. The outer sides of the bottoms of the six clamping blocks 3 are provided with protrusions which are hinged and connected in the first step of stepped holes. The sections of the bottoms of the inner side walls of the six clamping blocks 3 are arc-shaped, so that the inner structure can conveniently act on the six clamping blocks to clamp the blank. The top of six clamping blocks 3 is connected with a clamping block through a 10mm hexagon bolt, and the clamping block is provided with tooth grains for clamping the outer ring of the blank.

The locating part is positioned at the inner side of a circular ring formed by the six clamping blocks 3 and comprises a first locating plate 11, six clamping jaws, an ultra-precise first locating pin 8 and an ultra-precise second locating plate 9. The first positioning plate 11, the first positioning pin 8 and the second positioning plate 9 are coaxial. The first positioning plate 11 is connected with the second positioning plate 9 through bolts. The cross section of the bottom of the outer side wall of the second positioning plate 9 is arc-shaped and is matched with the inner side walls of the six clamping blocks 3, and the distance between the outer side wall of the second positioning plate 9 and the inner side walls of the clamping blocks 3 is 4mm. The function of clamping the blank by the clamping block 3 is realized by the downward movement of the second positioning plate 9 acting on the arc-shaped inner side wall of the clamping block 3.

The first positioning plate 11 is provided with a positioning plate groove; the positioning plate grooves are provided with two groups, namely a first positioning plate groove 12 and a second positioning plate groove 13; the opening directions of the first locating plate groove 12 and the second locating plate groove 13 are opposite, and the first locating plate groove 12 and the second locating plate groove 13 are distributed in an equidistant and staggered mode, so that the influence of the locating plate groove on the strength of the locating plate is effectively avoided.

The second positioning plate 9 is provided with two groups of positioning plate holes, namely a first positioning plate hole 6 and a second positioning plate hole 7; the opening directions of the first positioning plate holes 6 and the second positioning plate holes 7 are opposite, and the first positioning plate holes 6 and the second positioning plate holes 7 are distributed at equal intervals in a staggered way. The locating plate groove corresponds with the position of locating plate hole, and locating plate groove can make things convenient for clamping first horizontal plate 17 and second horizontal plate 23, and the locating plate hole will restrict the jack catch and remove in locating plate hole inside, can not surpass its regional scope. At the same time, the connection strength of the clamping block 3 can be increased, and the second positioning plate 9 and the first positioning plate 11 are prevented from being crushed. Six claws can freely slide in the inside of locating plate holes, and when processing, radial cutting force of clamping block 3 and cutter to the blank is offset through the claw, effectively guarantees that machining error is in reasonable scope. A positioning groove 10 is formed in the middle of the first positioning plate 11; the middle part of the second positioning plate 9 is provided with a positioning hole 14; the positioning groove 10 and the positioning hole 14 are matched with the first positioning pin 8, so that the scroll is ensured to be positioned in the middle of the second positioning plate 9. When clamping the vortex plate, the error of post milling caused by movement is prevented from increasing. The bottom of the second positioning plate 9 is also provided with a second positioning pin 26 for restricting rotation of the blank of the scroll on the second positioning plate 9.

The actuator comprises a secondary cylinder 5, a first fixing plate 19 and a second fixing plate 21. The first fixing plate 19 and the second fixing plate 21 are coaxial with the first positioning pin 8. The air cylinder 5 is connected to the second reference seat 1 through bolts, and a second-stage piston rod of the air cylinder 5 is sequentially sleeved with a first fixing plate 19 and a second fixing plate 21 from bottom to top; the second-stage piston rod of the air cylinder 5 is sequentially connected with a first positioning plate 11 and a first positioning pin 8 from bottom to top through bolts. The outer wall of the blank can be sequentially clamped through the step-by-step operation of the two-stage piston rod, the inside of the blank is clamped, and the influence of cutting force and clamping force of the blank in the machining process is further ensured. The outside of blank is pressed from both sides tightly earlier, can realize pressing from both sides the automatic centering function of clamp block, and then guarantees the precision that the clamping jaw of inside pressed from both sides the clamp of blank bottom structure, and reverse process presss from both sides tight blank and can increase machining error.

Three first connection plates 18 are arranged at equal intervals on the outer side wall of the first fixing plate 19. One side of the first connecting plate 18 is provided with a first connecting rod 16, one end of the first connecting rod 16 is hinged with a first horizontal plate 17, the other end of the first connecting rod 16 is hinged with the outer wall of one side of the first connecting plate 18 to form a connecting rod structure, the first horizontal plate 17 freely slides in a locating plate groove through the air cylinder 5, and radial stress is more uniform in the process of clamping a blank.

Three second connecting plates 22 are distributed on the outer side wall of the second fixing plate 21 at equal intervals; one side of the second connecting plate 22 is provided with a second connecting rod 20, one end of the second connecting rod 20 is rotationally connected with a second horizontal plate 23, the other end of the second connecting rod 20 is rotationally connected with the outer wall of one side of the second connecting plate 22 to form a connecting rod structure, the second horizontal plate 23 freely slides in a locating plate groove through the air cylinder 5, and the stress is more uniform in the process of clamping a blank.

The first horizontal plate 17 and the second horizontal plate 23 slide freely in the positioning plate groove, and the three first horizontal plates 17 and the three second horizontal plates 23 are respectively connected with corresponding clamping claws in a clamping way. The movement of the first horizontal plate 17 and the second horizontal plate 23 is indirectly controlled by the action of the air cylinder 5 to position the clamped blank while eliminating the influence of the clamping block 3 and the cutter on the blank during milling.

The width of first locating plate hole 6 and second locating plate hole 7 is greater than the width of first locating plate groove 12 and second locating plate groove 13, can restrict the jack catch in the inside of locating plate hole, prevents that the jack catch from protruding in transition, influences the clamping effect, causes the too big machining error of machined surface.

The first positioning plate groove 12 and the second positioning plate groove 13 are respectively provided with a track groove matched with the first horizontal plate 17 and the second horizontal plate 23, so that the first horizontal plate 17 and the second horizontal plate 23 can be clamped and freely moved conveniently.

T-shaped grooves are formed in the first horizontal plate 17 and the second horizontal plate 23, and teeth are arranged on the inner walls of the T-shaped grooves.

The jack catch includes fixed block 24 and backing plate 25, and fixed block 24 passes through bolt shank and backing plate 25 fixed connection, and the top of backing plate 25 is equipped with the frosting layer.

The sand grinding layer is matched with the teeth, and the backing plate 25 and the first horizontal plate 17 or the second horizontal plate 23 are separated from each other to move independently through the adjusting bolt rod, so that the clamping jaw can realize the function of positioning and clamping various shapes.

The rotation direction of the first connecting rod 16 is opposite to that of the second connecting rod 20, so that the first horizontal plate 17 and the second horizontal plate 23 are effectively guaranteed to move in opposite directions, and the influence of cutting force and radial clamping force on the blank is eliminated.

And torsion springs are arranged between the six clamping blocks 3 and the first reference seat 2 and used for automatically returning to the initial position after the clamping blocks 3 finish machining the blank, so that the clamping blocks 3 are prevented from shifting and the machining of the following blank is prevented from being influenced.

After the fixture tool is installed on the machine tool, and before the fixture tool is used for the first time, the milling machine is used for milling the clamping block 3 and the clamping jaw for one time respectively, so that the roundness of the clamping block 3 and the clamping jaw is guaranteed, and the machining precision is effectively improved.

Example 2:

unlike example 1, the following is:

the clamping jaw, the positioning plate groove and the positioning plate holes are four in number, and the clamping function of the scroll blank can be realized.

Example 3:

unlike example 2, the following is:

the number of the clamping claws, the positioning plate grooves and the positioning plate holes is eight, and the clamping function of the scroll blank can be realized.

Example 4:

unlike example 1, the following is:

the rotation direction of the first connecting rod 16 is the same as that of the second connecting rod 20, so that the clamping of the revolving body or the thin-wall part is realized.

Example 5:

as shown in fig. 7, the bottom of the blank member is pre-cast with a shaft hole, a cylindrical hole and a positioning hole.

step one: after the fixture tool is arranged on a milling machine, milling the clamping block (3) and the clamping jaw for one time by using a milling machine when the fixture tool is used for the first time, so that the roundness of the clamping block 3 and the clamping jaw is ensured;

step two: the cylinder 5 is regulated to enable the clamping jaw of the cylinder to be positioned at a position required by design, a blank with the bottom processed is placed above the second positioning plate 9, the shaft hole at the bottom of the blank is matched with the first positioning pin 8, and the positioning hole is matched with the second positioning pin 26;

step three: the adjusting cylinder 5 moves downwards, and the first positioning plate 11 and the second positioning plate 9 move downwards along with the adjusting cylinder, so that the clamping block 3 clamps the blank;

step four: continuing to adjust the cylinder 5 to move downwards, and respectively moving the fixed blocks 24 on the first horizontal plate 17 and the second horizontal plate 23 to the inner side and the outer side to clamp the cylindrical hole at the bottom of the blank;

Example 6:

as shown in fig. 5 and 7, unlike embodiment 4, there is:

the following changes are only required for different specifications of scrolls:

step one: the blank of the specification bottom structure is placed between the clamping block 3 and the fixing block 24, the blank of the specification bottom structure is clamped by moving upwards through the adjusting air cylinder 5, the clamping jaw is not clamped, the clamping jaw and the blank of the specification bottom structure are used for calibrating and positioning through the adjusting bolt rod, and clamping of the blank of the specification bottom structure is achieved.

The invention is suitable for vortex disc blanks with various bottom structures, the positions of the clamping jaws of the vortex disc blanks are adjusted by adjusting the bolt rods, then the clamping jaws are respectively clamped inwards or outwards by the air cylinders through the connecting rod mechanisms, the influence of cutting force and clamping force on machining errors during machining is counteracted, and the vortex disc blanks are not suitable for large-diameter blanks. 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.

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 fixture tool for milling the vortex plate is characterized by comprising an expanding part, a positioning part and an executing part;

the expanding part comprises a first reference seat (2), a second reference seat (1) and a plurality of clamping blocks (3); a connecting rod (4) is arranged between the first reference seat (2) and the second reference seat (1) and is fixedly connected into a whole; a stepped hole is formed in the middle of the first reference seat (2); the outer sides of the bottoms of the plurality of clamping blocks (3) are respectively provided with a protrusion, and the protrusions are rotationally connected inside the stepped holes; the sections of the bottoms of the inner side walls of the plurality of clamping blocks (3) are all arc-shaped; the top of the plurality of clamping blocks (3) is fixedly connected with a clamping block (15), and the inner side wall of the clamping block (15) is provided with teeth;

the positioning part is positioned at the inner side of the clamping block (3) and comprises a first positioning plate (11), a plurality of clamping claws, a first positioning pin (8) and a second positioning plate (9); the first positioning plate (11) is fixedly connected with the second positioning plate (9); the section of the bottom of the outer side wall of the second positioning plate (9) is arc-shaped and is matched with the inner side wall of the clamping block (3); a positioning plate groove is formed in the first positioning plate (11); a positioning plate hole is formed in the second positioning plate (9); the positioning plate grooves correspond to the positions of the positioning plate holes; the clamping claws are movably connected in the holes of the positioning plate; a positioning groove (10) is formed in the middle of the first positioning plate (11); a positioning hole (14) is formed in the middle of the second positioning plate (9); the positioning groove (10) and the positioning hole (14) are matched with the first positioning pin (8); the bottom of the second positioning plate (9) is also provided with a second positioning pin (26);

the execution part comprises a cylinder (5), a first fixed plate (19) and a second fixed plate (21); the air cylinder (5) is a secondary air cylinder; the air cylinder (5) is fixedly connected to the second reference seat (1); a first fixing plate (19) and a second fixing plate (21) are sequentially and fixedly connected with a second-stage piston rod of the air cylinder (5) from bottom to top; a first positioning plate (11) and a first positioning pin (8) are sequentially and fixedly connected with a first-stage piston rod of the air cylinder (5) from bottom to top; a plurality of first connecting plates (18) are distributed on the outer side wall of the first fixing plate (19) at equal intervals; one side of the first connecting plate (18) is provided with a first connecting rod (16), one end of the first connecting rod (16) is rotationally connected with a first horizontal plate (17), and the other end of the first connecting rod (16) is rotationally connected with the outer wall of one side of the first connecting plate (18); a plurality of second connecting plates (22) are distributed on the outer side wall of the second fixing plate (21) at equal intervals; a second connecting rod (20) is arranged on one side of the second connecting plate (22), one end of the second connecting rod (20) is rotatably connected with a second horizontal plate (23), and the other end of the second connecting rod (20) is rotatably connected with the outer wall of one side of the second connecting plate (22); the first horizontal plate (17) and the second horizontal plate (23) are both movably connected to the inside of the positioning plate hole; the first horizontal plate (17) and the second horizontal plate (23) are respectively connected with corresponding clamping jaws in a matching way.

2. The fixture tool for milling the vortex plate according to claim 1, wherein two groups of locating plate grooves are provided, namely a first locating plate groove (12) and a second locating plate groove (13); the opening directions of the first positioning plate groove (12) and the second positioning plate groove (13) are opposite, and the first positioning plate groove (12) and the second positioning plate groove (13) are distributed in an equidistant and staggered manner;

the two groups of holes are respectively a first positioning plate hole (6) and a second positioning plate hole (7); the opening directions of the first positioning plate holes (6) and the second positioning plate holes (7) are opposite, and the first positioning plate holes (6) and the second positioning plate holes (7) are distributed at equal intervals in a staggered mode.

3. The jig tool for milling a scroll according to claim 2, wherein the widths of the first positioning plate hole (6) and the second positioning plate hole (7) are larger than the widths of the first positioning plate groove (12) and the second positioning plate groove (13).

4. The fixture tool for milling the vortex plate according to claim 2, wherein the first positioning plate groove (12) and the second positioning plate groove (13) are respectively provided with an orbit groove matched with the first horizontal plate (17) and the second horizontal plate (23).

5. The fixture tool for milling the vortex plate according to claim 1, wherein the first horizontal plate (17) and the second horizontal plate (23) are provided with T-shaped grooves, and teeth are arranged on the inner walls of the T-shaped grooves.

6. The fixture tool for milling a scroll according to claim 1, wherein the claw comprises a fixed block (24) and a backing plate (25); the fixed block (24) is fixedly connected with the base plate (25) through a bolt rod, and a sand grinding layer is arranged at the top of the base plate (25).

7. The fixture tool for milling the vortex plate according to claim 6, wherein the top of the backing plate (25) is matched with the inner wall of the T-shaped groove.

8. The jig tool for milling a scroll according to claim 1, wherein the rotation direction of the first link (16) is opposite to the rotation direction of the second link (20).

9. The fixture tool for milling the vortex plate according to claim 1, wherein torsion springs are arranged between the clamping blocks (3) and the first reference seat (2).

10. The method of using a jig tool for milling a scroll, according to any one of claims 1 to 9, characterized by comprising the steps of:

step one: after the fixture tool is arranged on a milling machine, milling the clamping block (3) and the clamping jaw for one time by using a milling machine when the fixture tool is used for the first time, so that the roundness of the clamping block (3) and the clamping jaw is ensured;

step two: the cylinder (5) is regulated to enable the clamping jaw of the cylinder to be positioned at a position required by design, and a blank piece with the bottom processed is placed above the second positioning plate (9) so that a shaft hole at the bottom of the blank piece is matched with the first positioning pin (8);

step three: the adjusting cylinder (5) moves downwards, and the first positioning plate (11) and the second positioning plate (9) move downwards along with the adjusting cylinder, so that the clamping block (3) clamps the blank;

step four: continuing to adjust the downward movement of the air cylinder (5), and respectively moving the fixed blocks (24) on the first horizontal plate (17) and the second horizontal plate (23) to the inner side and the outer side to clamp the cylindrical hole at the bottom of the blank;