CN115625322B

CN115625322B - Positioning casting device for steam turbine cylinder and positioning casting process thereof

Info

Publication number: CN115625322B
Application number: CN202211100167.6A
Authority: CN
Inventors: 杨建�; 曹峤; 郭锐; 杨茂海; 朱玮
Original assignee: Jiangsu Wanheng Casting Industry Co ltd
Current assignee: Jiangsu Wanheng Casting Industry Co ltd
Priority date: 2022-05-13
Filing date: 2022-09-08
Publication date: 2023-05-09
Anticipated expiration: 2042-09-08
Also published as: CN115625322A; CN114871421A

Abstract

The invention relates to a positioning casting device for a steam turbine cylinder and a positioning casting process thereof, and relates to the technical field of positioning casting of the steam turbine cylinder, and the positioning casting device comprises a forming mechanism for forming the steam turbine cylinder, wherein the forming mechanism comprises two supporting plates, the upper ends of the two supporting plates are horizontally and slidably inserted with T-shaped ejector rods through inserting holes, one ends of the two T-shaped ejector rods, which are close to each other, are fixedly provided with spherical seats, the outer wall of each spherical seat is symmetrically provided with two hinging rods, the end part of one hinging rod of each spherical seat is hinged with a forming die, and one ends of the two forming dies, which are far away from the hinging rods, are hinged, and the beneficial effects achieved by the positioning casting device are that: the forming mechanism is used for replacing manual bare-handed opening of the forming die to perform workpiece taking operation, the phenomenon that blank spare heat is brought to a worker for strong roasting sensation is avoided, the T-shaped ejector rod rotates in the inserting hole of the supporting plate, the forming die can be overturned to the lower side, the height of the forming die is reduced, and blank damage caused by clamping falling in the manual workpiece taking process is avoided.

Description

Positioning casting device for steam turbine cylinder and positioning casting process thereof

Technical Field

The invention relates to the technical field of positioning casting of steam turbine cylinders, in particular to a positioning casting device for a steam turbine cylinder and a positioning casting process thereof.

Background

The steam turbine cylinder is cast, and when the steam turbine cylinder is cast, metal liquid is poured into a casting cavity, needed parts or blanks are formed after the metal liquid is cooled, then the parts or the blanks are manually taken out, and because the blanks are left with residual temperature after cooling, the forming die is opened by bare hands to take out parts, the residual temperature of the blanks brings strong roasting feeling to workers, and in the process of taking out the blanks from the cavity, the blanks are damaged and cannot be subjected to the next process without clamping and falling.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a positioning casting device for a steam turbine cylinder, which solves the technical problem in the background art.

The technical scheme adopted for solving the technical problems is as follows: a positioning casting device for a steam turbine cylinder comprises a forming mechanism for forming the steam turbine cylinder, and the forming mechanism is used for performing forming operation on the steam turbine cylinder.

The forming mechanism comprises two supporting plates, the upper ends of the two supporting plates are respectively connected with T-shaped ejector rods in a sliding mode through inserting holes, one ends, close to each other, of the two T-shaped ejector rods are fixedly provided with spherical seats, two hinging rods are symmetrically arranged on the outer walls of the spherical seats, one end portion of one hinging rod of each spherical seat is hinged with a forming die, one ends, far away from the hinging rods, of each hinging rod of the two forming dies are hinged, forming cavities are formed in opposite side walls of the two forming dies, the two T-shaped ejector rods respectively slide along the inner portions of the inserting holes of the two supporting plates to one side, close to each other, of the two forming dies are driven to overturn around the hinging positions by the hinging rods until forming cavity openings of the two forming dies are right opposite to fit, and a closed forming cavity is formed for forming operation of a blank of a steam turbine cylinder.

The end of another articulated rod of ball-type seat articulates there is the articulated slab, and two articulated slabs are kept away from the one end of articulated rod and are articulated through the connecting rod, through the two articulated slabs that will articulate together around articulated position upset, be about two articulated slabs to one side adjustment that is kept away from each other, can drive two T type ejector pins respectively through two ball-type seats along the inside one side horizontal slip that is kept away from each other of spliced eye of two backup pads, thereby can assist to strut two laminating forming die together around articulated position to one side that is kept away from each other, need not the staff and contact forming die personally and carry out the drawing of patterns operation, make the staff can keep away from the turbine cylinder that just demold.

The outer wall of the T-shaped ejector rod is slidably sleeved with the spring between the spherical seat and the supporting plate, the T-shaped ejector rod can be jacked up in real time along the inside of the inserting hole by utilizing the elasticity of the spring, so that the spherical seats at the end parts of the two T-shaped ejector rods can be attached together in real time, the forming cavity openings of the two forming dies can be accurately aligned, and the effective forming operation is ensured.

As a preferable technical scheme of the invention, the opposite side walls of the two hinged plates are provided with the mounting grooves, the inside of the mounting grooves rotates a plurality of mounting plates positioned in the mounting grooves through the pin shafts, one end of each mounting plate far away from the pin shaft is provided with the hairbrush protruding out of the mounting groove, when the two forming dies are rotated and spread, the two forming dies are rotated and adjusted from being attached together to be distributed in a structure similar to a straight line shape, and simultaneously the two hinged plates are rotated and adjusted to be in a structure similar to the straight line shape, simultaneously, the forming cavities of the two forming dies are opposite to the hairbrush of each mounting plate, and the hairbrush can be driven to clean the forming cavities of the forming dies until the forming dies are completely cleaned.

The hinged plate not only can avoid the operation that the staff directly rotates two forming dies to carry out the drawing of patterns, but also can adjust the brush of mounting disc lateral wall to the forming cavity of forming die to clear up the operation.

As a preferable technical scheme of the invention, the outer wall of one end of the mounting plate, which is close to the pin shaft, is fixedly sleeved with the first fluted disc, two adjacent mounting plates in the same mounting groove are meshed through the two first fluted discs, and only one mounting plate in the same mounting groove is rotated, the two adjacent first fluted discs can be meshed to realize power transmission, so that all the mounting plates can synchronously rotate, and the cleaning efficiency of the inside of a forming cavity of the forming die is improved.

As a preferable technical scheme of the invention, a pin shaft of one mounting plate, which is close to one end of the hinging positions of two hinging plates, in the mounting groove rotates to penetrate through the mounting groove, a second fluted disc is fixedly connected, the side wall of a connecting rod at the hinging positions of the two hinging plates rotates to be provided with a limiting rod, the outer wall of the limiting rod is fixedly sleeved with a third fluted disc, the third fluted disc is meshed with the second fluted disc, when the two hinging plates rotate around the hinging positions of the hinging rods, the two hinging plates are simultaneously spread to one side far away from each other until the two hinging plates are adjusted to be close to a straight-line structure, a pin shaft which is rotated and extended to the outer side of the hinging plates is meshed with the third fluted disc on the outer wall of the limiting rod through the second fluted disc, the third fluted disc can be driven to rotate by bare hands, the second fluted disc on two sides can be driven to synchronously rotate, the corresponding mounting plates can be driven to synchronously rotate through the pin shaft, and the first fluted disc is driven to synchronously rotate, so that all the mounting plates can synchronously rotate, and the efficiency of impurities in the forming cavity of the forming die can be further improved.

As a preferable technical scheme of the invention, the supporting mechanism capable of supporting the forming mechanism is arranged below the forming mechanism, and the forming mechanism is stably supported by the supporting mechanism, so that the forming mechanism can conveniently perform forming operation, and simultaneously, demolding and cleaning operation after demolding are performed.

The supporting mechanism comprises two parallel backup plates, the two backup plates are respectively and vertically fixed to the upper end faces of the two backup plates, supporting legs are vertically and fixedly arranged at the two ends of the bottom end of each backup plate, the two backup plates are supported by the four supporting legs, and the whole forming mechanism is supported in a vacation mode.

The outer wall bottom end fixing of supporting leg has cup jointed the support horizontal pole, the fixed tray that is equipped with between the tip of four support horizontal poles, the upper end rotation of tray is equipped with the spacing seat, and rotation department is equipped with the torsional spring, rotate T type ejector pin along the spliced eye is inside, T type ejector pin is still along the inside slip of spliced eye simultaneously, until the shaping chamber opening of two forming die is just to laminating, and the gag lever post can overturn to the top of tray, the joint breach with gag lever post tip joint has been seted up to the lateral wall at the spacing simultaneously, rotate the spacing around the tray up end, the torsional spring produces torsion energy, make the joint breach of spacing can just right with the spacing pole tip, then with in the joint breach is blocked to the gag lever post tip, utilize the torsion potential energy of torsional spring afterwards, rotate the spacing seat in tray up end is reverse, thereby make T type ejector pin can' T overturn in the spliced eye, make two gag lever post positions no longer take place the upset operation.

As a preferable technical scheme of the invention, the radial side wall of the inner bottom end of the clamping notch is provided with the limit groove, the radial side wall of the end part of the limit rod is fixedly provided with the limit clamping block clamped with the inside of the limit groove, when the limit rod is clamped into the clamping notch of the limit seat, the limit clamping block is clamped into the limit groove in the clamping notch at the same time, and when the limit seat rotates on the upper end surface of the tray, the limit clamping block rotates in the limit groove, so that the limit rod is prevented from separating from the clamping notch along the axial direction of the clamping notch, and the two T-shaped ejector rods are prevented from sliding horizontally along the reverse direction of the inside of the inserting hole, so that the two forming dies can be prevented from reversely overturning around the hinging position, and the two forming dies are prevented from rotating and expanding to the side far away from each other, thereby causing errors in the forming process.

As a preferable technical scheme of the invention, the radial side wall of the limit seat is fixedly provided with the handle, and the handle is held by hands, so that the limit seat can be conveniently rotated around the rotation position by applying force, and the clamping notch of the limit seat is opposite to the limit rod.

The invention has the following advantages:

1. after the forming mechanism is used for forming the steam turbine cylinder, the two T-shaped ejector rods are separated to the side far away from each other, so that the two forming dies can be separated, the demoulding operation is realized, the forming dies are opened by hands instead of manpower to perform the workpiece taking operation, and the problem that the blank residual temperature brings strong roasting feeling to workers is avoided.

2. The T-shaped ejector rod rotates in the inserting hole of the supporting plate, the forming die can be overturned to the lower side, the height of the forming die is reduced, and therefore blank damage caused by clamping falling in the process of manually taking a workpiece is avoided when the workpiece is demolded, so that the next process is conveniently carried out, and the machining efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of the main structure of a preferred embodiment of the present invention;

FIG. 2 is a schematic view of a support mechanism according to a preferred embodiment of the present invention;

fig. 3 is a semi-sectional view of a stopper seat according to a preferred embodiment of the present invention.

FIG. 4 is a top view cross-section of a stop lever and stop seat in accordance with a preferred embodiment of the present invention;

FIG. 5 is a half cross-sectional view of a hinge plate of a preferred embodiment of the present invention;

FIG. 6 is an enlarged view of the structure of FIG. 1A in accordance with a preferred embodiment of the present invention;

FIG. 7 is a partial exploded view of a molding mechanism according to a preferred embodiment of the present invention;

fig. 8 is an enlarged view of the structure at B in fig. 1 according to a preferred embodiment of the present invention.

In the figure: 1. a handle; 11. support legs; 12. a backup plate; 13. a support rail; 14. a tray; 15. a limit seat; 2. a first toothed disc; 21. a support plate; 22. t-shaped ejector rod; 23. a ball-shaped seat; 24. a forming die; 25. a hinged plate; 26. a limit rod; 27. a second toothed disc; 28. a third toothed disc; 29. a spring; 210. a brush; 211. a limit clamping block; 212. a pin shaft; 213. and (5) mounting a disc.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of 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 "third" are used for descriptive purposes only and are not to be construed as indicating or implying positive importance.

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 will be understood in specific cases by those of ordinary skill in the art.

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1-8, the present embodiment provides a positioning casting device for a steam turbine cylinder and a positioning casting process thereof, including a forming mechanism for forming the steam turbine cylinder, and the forming mechanism is used for forming the steam turbine cylinder.

The forming mechanism comprises two supporting plates 21, T-shaped ejector rods 22 are horizontally and slidably inserted into the upper ends of the two supporting plates 21 through inserting holes, spherical seats 23 are fixedly arranged at one ends, close to each other, of the two T-shaped ejector rods 22, two hinging rods are symmetrically arranged on the outer walls of the spherical seats 23, forming dies 24 are hinged to the end portions of one hinging rod of the spherical seats 23, one ends, far away from the hinging rods, of the two hinging rods are hinged, forming cavities are formed in opposite side walls of the two forming dies 24, the two T-shaped ejector rods 22 respectively slide along the inner portions of the inserting holes of the two supporting plates 21 to one side, close to each other, of the two forming dies 24 are turned around the hinging positions through the hinging rods, until forming cavity openings of the two forming dies 24 are opposite to each other, and a closed forming cavity is formed for forming operation of a blank of a steam turbine cylinder.

After the steam turbine cylinder blank is formed, demolding operation can be carried out by separating the two forming dies 24, but after cooling, blank is also provided with residual heat, the forming dies 24 are opened by bare hands to take out a piece, the residual heat of the blank is brought to the strong roasting feeling of workers, therefore, the end part of the other hinging rod of the spherical seat 23 is hinged with the hinged plate 25, one end of the two hinged plates 25 far away from the hinging rod is hinged through the connecting rod, the two hinged plates 25 hinged together are turned around the hinging position, namely, the two hinged plates 25 are adjusted to the side far away from each other, the two T-shaped ejector rods 22 can be respectively driven by the two spherical seats 23 to horizontally slide to the side far away from each other along the inside of the inserting holes of the two supporting plates 21, so that the two forming dies 24 attached together can be assisted to prop open to the side far away from each other around the hinging position, the workers do not need to personally contact the forming dies 24 to carry out demolding operation, and the workers can be far away from the steam turbine cylinder just demolded.

In addition, in the demolding process, in the process of taking out from the cavity, the blank is damaged due to the fact that the turbine blank directly falls down, the next process cannot be performed, in order to avoid damage to the blank, the T-shaped ejector rod 22 rotates in the inserting hole of the supporting plate 21, the forming die 24 can be overturned to the lower side, the height of the forming die 24 is reduced, the forming die is close to the ground or a receiving table for receiving the blank is arranged, and therefore when demolding, the blank damage caused by the fact that the blank is not clamped and falls down in the manual workpiece taking process is avoided, and the defective rate is reduced.

The outer wall of the T-shaped ejector rod 22 is slidably sleeved with the spring 29 between the ball-shaped seat 23 and the supporting plate 21, the T-shaped ejector rod 22 can be jacked up in real time along the inside of the inserting hole by utilizing the elasticity of the spring 29, so that the ball-shaped seats 23 at the end parts of the two T-shaped ejector rods 22 can be attached together in real time, the opening of the forming cavity of the two forming dies 24 can be accurately aligned, the effective forming operation is ensured, the random separation of the two forming dies 24 is avoided in the forming process, the forming cavity of the two forming dies 24 cannot be closed, and a blank cannot be formed.

Other limiting parts can be adopted, so long as the forming process is met, the forming cavity openings of the two forming dies 24 can be just opposite to and attached to each other in real time, the forming cavities of the two forming dies 24 are ensured to be in a relatively closed state, and therefore the packaging blank is formed, and the increase of the defective rate is avoided.

Once the turbine cylinder is demolded, dust or other impurity particles are easy to remain in the molding cavities of the two molding dies 24, when molding operation is performed again, the surface of a molded blank is easy to cause a pothole phenomenon, post-treatment is needed, the production efficiency of the finished turbine cylinder is affected, and therefore cleaning is needed in the molding cavities before casting each time, working hours are consumed, and the production efficiency of the finished turbine cylinder is also affected.

Through having seted up the mounting groove at two articulated plates 25 relative lateral wall, the inside of mounting groove rotates a plurality of in mounting groove internal mounting dish 213 through round pin axle 212, the one end that the round pin axle 212 was kept away from to the mounting dish 213 is equipped with the brush 210 of protrusion mounting groove, when two forming die 24 rotate and prop up, rotate from laminating together and adjust to be nearly the style of calligraphy structural distribution, two articulated plates 25 rotate simultaneously and adjust to nearly the style of calligraphy structural, simultaneously, can make the shaping chamber of two forming die 24 just right with the brush 210 of every mounting dish 213 like this, as long as rotate every mounting dish 213, just can drive the brush 210 and clear up the shaping chamber of forming die 24 operation, until totally cleanly.

The hinge plate 25 not only can avoid the operation of directly rotating the two molding dies 24 by a worker to perform demolding, but also can adjust the hairbrush 210 on the side wall of the mounting plate 213 to the molding cavity of the molding die 24 to perform cleaning operation.

The first fluted disc 2 is fixedly sleeved on the outer wall of one end of the mounting disc 213 close to the pin shaft 212, two adjacent mounting discs 213 in the same mounting groove are meshed through the two first fluted discs 2, and as long as any one mounting disc 213 in the same mounting groove is rotated, the two adjacent first fluted discs 2 can be meshed, so that power transmission is realized, synchronous rotation of all the mounting discs 213 is realized, and the cleaning efficiency of the inside of a forming cavity of the forming die 24 is improved.

The pin shaft 212 of one mounting plate 213 inside the mounting groove, which is close to one end of the hinge joint positions of the two hinge plates 25, rotates to penetrate through the mounting groove, the second fluted disc 27 is fixedly connected, the side wall of the connecting rod at the hinge joint positions of the two hinge plates 25 rotates to be provided with the limiting rod 26, the outer wall of the limiting rod 26 is fixedly sleeved with the third fluted disc 28, the third fluted disc 28 is meshed with the second fluted disc 27, when the two hinge plates 25 rotate around the hinge joint positions of the hinge joint rods, the two hinge plates 25 are simultaneously spread towards one sides far away from each other until the hinge joint plates are adjusted to be close to a straight-line structure, and meanwhile, the pin shaft 212 extending to the outer side of the hinge plates 25 rotates to be meshed with the third fluted disc 28 on the outer wall of the limiting rod 26 through the second fluted disc 27.

The third fluted disc 28 can be driven to rotate only by rotating the limiting rod 26 by bare hands, the second fluted discs 27 on two sides can be driven to synchronously rotate by the third fluted disc 28 which rotates, the corresponding mounting discs 213 can be driven to synchronously rotate by the pin shafts 212, and all the mounting discs 213 can synchronously rotate by the transmission of the first fluted disc 2, so that the efficiency of impurities in the forming cavity of the forming die 24 is further improved.

The supporting mechanism capable of supporting the forming mechanism is arranged below the forming mechanism, the forming mechanism is stably supported by the supporting mechanism, the forming mechanism is convenient to perform forming operation, and meanwhile, demolding and cleaning operation after demolding are performed.

The supporting mechanism comprises two backup plates 12 which are distributed in parallel, the two supporting plates 21 are respectively and vertically fixed on the upper end surfaces of the two backup plates 12, supporting legs 11 are vertically and fixedly arranged at the two ends of the bottom end of each backup plate 12, and the four supporting legs 11 are used for supporting the two backup plates 12, namely, the whole forming mechanism is vacated and supported.

The outer wall bottom end fixing of supporting leg 11 has cup jointed support horizontal pole 13, the fixed tray 14 that is equipped with between the tip of four support horizontal poles 13, the upper end rotation of tray 14 is equipped with spacing seat 15, and the department of rotating is equipped with the torsional spring, rotate T type ejector pin 22 along the spliced eye is inside, T type ejector pin 22 still slides along the spliced eye is inside simultaneously, until the shaping chamber opening of two shaping moulds 24 is just right laminating, and gag lever post 26 can overturn to the top of tray 14, the lateral wall at spacing seat 15 has seted up the joint breach with gag lever post 26 tip joint simultaneously, rotate spacing seat 15 around tray 14 up end, the torsional spring produces torsion potential energy, make spacing seat 15 just right with gag lever post 26 tip, then in the joint breach is blocked to gag lever 26 tip, then utilize the torsion potential energy of torsional spring, reverse rotation of spacing seat 15 at tray 14 up end, thereby make T type ejector pin 22 unable upset in the spliced eye, make two gag lever post 26 positions no longer take place the upset operation.

In addition, the radial lateral wall in the inside bottom of joint breach has seted up the spacing groove, the radial lateral wall of tip of gag lever post 26 is fixed be equipped with the spacing fixture block 211 of the inside joint of spacing groove, after the joint breach of gag lever post 26 card in spacing seat 15, spacing fixture block 211 card is in the inside spacing groove of joint breach simultaneously, spacing seat 15 rotates at tray 14 up end, spacing fixture block 211 rotates in the spacing inslot portion, avoid gag lever post 26 to break away from the joint breach along joint breach axial direction like this, thereby avoid two T type ejector pins 22 along the inside reverse horizontal slip of spliced eye, just so can avoid two forming die 24 to overturn around articulated position backward, lead to two forming die 24 to rotate to the one side that keeps away from each other and prop up, cause the error in the shaping process.

The handle 1 is fixedly arranged on the radial side wall of the limit seat 15, and the handle 1 is held by hands, so that the limit seat 15 can be conveniently rotated around the rotation position by applying force, and the clamping notch of the limit seat 15 is opposite to the limiting rod 26.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Other parts of the present invention not described in detail are all of the prior art, and are not described in detail herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The positioning casting device for the steam turbine cylinder is characterized by comprising a forming mechanism for forming the steam turbine cylinder, wherein the forming mechanism comprises two supporting plates (21), the upper ends of the two supporting plates (21) are horizontally and slidably inserted with T-shaped ejector rods (22) through insertion holes, one ends, close to each other, of the two T-shaped ejector rods (22) are fixedly provided with spherical seats (23), the outer wall of each spherical seat (23) is symmetrically provided with two hinging rods, the end part of one hinging rod of each spherical seat (23) is hinged with a forming die (24), one end, far away from the hinging rod, of each forming die (24) is hinged, and the opposite side walls of the two forming dies (24) are provided with forming cavities;

the end part of the other hinging rod of the spherical seat (23) is hinged with a hinging plate (25), and one end of the two hinging plates (25) far away from the hinging rod is hinged through a connecting rod;

the outer wall of the T-shaped ejector rod (22) is sleeved with a spring (29) between the spherical seat (23) and the supporting plate (21) in a sliding manner; the two hinge plates (25) are provided with mounting grooves on the opposite side walls, a plurality of mounting plates (213) are rotatably mounted in the mounting grooves through pin shafts (212), and brushes (210) protruding out of the mounting grooves are arranged at one ends of the mounting plates (213) away from the pin shafts (212); the outer wall of one end, close to the pin shaft (212), of the mounting disc (213) is fixedly sleeved with a first fluted disc (2), and two adjacent mounting discs (213) in the same mounting groove are meshed through the two first fluted discs (2); the hinge pin (212) of a mounting plate (213) which is close to one end of the hinge plate (25) at the hinge position inside the mounting groove rotates to penetrate the mounting groove, the second fluted disc (27) is fixedly connected, the side wall of the connecting rod at the hinge position of the two hinge plates (25) rotates to be provided with the limiting rod (26), the outer wall of the limiting rod (26) is fixedly sleeved with the third fluted disc (28), when the two hinge plates (25) rotate around the hinge position of the hinge rod, the two hinge plates (25) are spread to one sides far away from each other until the hinge plate is adjusted to be close to a straight-line structure, the hinge pin (212) which is extended to the outer side of the hinge plates (25) rotates to be meshed with the third fluted disc (28) on the outer wall of the limiting rod (26) through the second fluted disc (27), the third fluted disc (28) can be driven to rotate only by hands, the second fluted disc (27) on two sides can be driven to synchronously rotate, the corresponding mounting plate (213) can be driven to synchronously rotate through the hinge pin (212), and all the mounting plates (213) can be synchronously rotated through the transmission of the first fluted disc (2).

2. The positioning casting device for a steam turbine cylinder according to claim 1, wherein a supporting mechanism capable of supporting the forming mechanism is arranged below the forming mechanism;

the supporting mechanism comprises two backup plates (12) which are distributed in parallel, and two supporting plates (21) are respectively and vertically fixed on the upper end surfaces of the two backup plates (12).

3. The positioning casting device for the steam turbine cylinder according to claim 2, wherein supporting legs (11) are vertically and fixedly arranged at two ends of the bottom end of the backup plate (12), supporting cross bars (13) are fixedly sleeved at the bottom ends of the outer walls of the supporting legs (11), a tray (14) is fixedly arranged between the ends of the four supporting cross bars (13), a limiting seat (15) is rotatably arranged at the upper end of the tray (14), and a torsion spring is arranged at the rotating position;

the side wall of the limit seat (15) is provided with a clamping notch which is clamped with the end part of the limit rod (26).

4. A positioning casting device for a steam turbine cylinder according to claim 3, wherein a limit groove is formed in the radial side wall of the inner bottom end of the clamping notch, and a limit clamping block (211) clamped with the inside of the limit groove is fixedly arranged on the radial side wall of the end part of the limit rod (26).

5. A positioning casting device for a steam turbine cylinder according to claim 3, characterized in that the radial side wall of the limit seat (15) is fixedly provided with a handle (1).

6. A positioning casting process for a positioning casting device for a steam turbine cylinder, employing a positioning casting device for a steam turbine cylinder as claimed in claim 1, characterized by comprising the steps of:

firstly, forming cavities are formed in opposite side walls of two forming dies (24), two T-shaped ejector rods (22) respectively slide horizontally along the insides of inserting holes of two supporting plates (21) towards one sides which are mutually gathered, two spherical seats (23) drive the two forming dies (24) to overturn around a hinging position through hinging rods until forming cavity openings of the two forming dies (24) are opposite to fit, so that a closed forming cavity is formed for forming operation of a steam turbine cylinder blank;

then through the two articulated plates (25) that will hinge together around articulated position upset, namely two articulated plates (25) are to the one side adjustment that is kept away from each other, can drive two T type ejector pins (22) respectively through two ball-type seat (23) and slide along the inside one side horizontal slip that is kept away from each other of spliced eye of two backup pad (21), thereby can assist to strut two forming die (24) that laminating together around articulated position to one side that is kept away from each other, need not staff's contact forming die (24) personally and carry out the drawing of patterns operation, make the staff can keep away from just the steam turbine cylinder of drawing of patterns.