阅读说明：本技术 一种用于水泥井盖的浇筑模具 (A pour mould for cement well lid ) 是由 游桂林 陈忠 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种用于水泥井盖的浇筑模具,涉及水泥井盖生产技术领域。本发明包括底模,中柱和上模,底模的底板连接有圆柱凸台和圆筒板；中柱与圆柱凸台、底板和圆筒板间形成用于浇筑井盖圈的井盖圈浇筑槽；上模上表面开设有阶梯孔,并通过阶梯孔套设于中柱上端,且阶梯孔内壁与中柱的上端面间形成用于井盖浇筑的井盖浇筑槽。本发明通过中柱与圆柱凸台、底板和圆筒板间形成井盖圈浇筑槽,以及中柱与上模的阶梯孔间形成井盖浇筑槽,使得制备的井盖和井盖圈均已中柱为基准,解决了现有井盖和井盖圈使用时的配合精度差的问题,同时,通过上模与中柱的活动连接,使得井盖与上模脱离更加便利,解决了现有井盖取出不便的问题。(The invention discloses a pouring mold for a cement well lid, and relates to the technical field of cement well lid production. The invention comprises a bottom die, a middle column and an upper die, wherein a bottom plate of the bottom die is connected with a cylindrical boss and a cylindrical plate; a manhole cover ring pouring groove for pouring a manhole cover ring is formed between the central column and the cylindrical boss as well as between the bottom plate and the cylindrical plate; go up the mould upper surface and seted up the shoulder hole to locate the center pillar upper end through the shoulder hole cover, and form the well lid that is used for the well lid to pour between the up end of shoulder hole inner wall and center pillar and pour the groove. According to the well lid and the well lid ring manufacturing method, the well lid ring pouring groove is formed between the center column and the cylindrical boss, between the bottom plate and the cylindrical plate, and between the center column and the stepped hole of the upper mold, the well lid and the well lid ring are manufactured on the basis of the center column, so that the problem that the matching precision is poor when the existing well lid and the well lid ring are used is solved, meanwhile, the well lid is more convenient to separate from the upper mold through the movable connection between the upper mold and the center column, and the problem that the existing well lid is inconvenient to take out is solved.)

1. The utility model provides a pour mould for cement well lid which characterized in that includes:

the bottom die (1), the bottom die (1) comprises a bottom plate (101); the upper surface of the bottom plate (101) is fixedly connected with a cylindrical boss (102) and a cylindrical plate (103) which is concentric with the cylindrical boss (102); the upper end surface of the cylindrical boss (102) is provided with a circular sinking groove (104) which is concentrically arranged;

the steel plate comprises a middle column (2), wherein a plurality of rectangular notches (201) are formed in the circumferential surface of the middle column (2); the lower end of the middle column (2) is matched with the circular sinking groove (104); well cover ring pouring grooves (21) for pouring well cover rings are formed among the middle columns (2), the cylindrical bosses (102), the bottom plate (101) and the cylindrical plates (103);

the upper die (3), the upper surface of the upper die (3) is provided with a stepped hole (301); the upper die (3) is sleeved at the upper end of the center pillar (2) through a stepped hole (301); the step surface of the stepped hole (301) is fixedly connected with two upright posts (305);

the lower surface of the upper die (3) is fixedly connected with a strip-shaped column (302) in clearance fit with the rectangular notch (201); bar post (302) lower surface is connected with compression spring (303), and compression spring (303) lower extreme offsets with rectangle notch (201) interior bottom surface for make through compression spring (303) to go up mould (3) and keep in center pillar (2) upper end position, and form between the up end of shoulder hole (301) inner wall and center pillar (2) and be used for the well lid that the well lid was pour groove (31).

2. Pouring mould for cement manhole covers according to claim 1, characterized in that the outer wall of said cylindrical plate (103) is provided with a flange (105); the flange (105) is provided with a connecting hole and is connected with the bottom plate (101) through a bolt; the lower surface of the bottom plate (101) is fixedly connected with a plurality of foot pads (106).

3. The pouring mold for cement manhole covers according to claim 2, wherein the cylindrical plate (103) comprises a plurality of arc-shaped plates, and is formed by splicing the arc-shaped plates.

4. The pouring mold for the cement well lid as claimed in claim 1, 2 or 3, wherein the lower end face of the central column (2) is provided with a top column hole (202) communicated with the rectangular notch (201), and a top column (4) is arranged in the top column hole (202); the inner bottom surface of the circular sinking groove (104) is provided with a blind hole (107) which is in clearance fit with the top column (4);

a pressing block (203) is rotationally connected in the rectangular notch (201); briquetting (203) one end offsets with fore-set (4) upper end, and the other end offsets with bar post (302) upper surface for push up briquetting (203) through fore-set (4) up for briquetting (203) other end pushes down and moves bar post (302), makes and goes up mould (3) position and moves down.

5. The pouring mold for the cement well lid as claimed in claim 4, wherein the top pillar (4) is provided with a connecting hole (401) at the upper end; a connecting column (402) is movably inserted into the connecting hole (401); the connecting column (402) is sleeved with a buffer spring (403), and the upper end of the connecting column (402) is fixedly connected with a top block (404);

the upper surface of the top block (404) is abutted against the pressing block (203); the upper end of the buffer spring (403) is abutted against the lower surface of the ejector block (404), and the lower end of the buffer spring is abutted against the upper end surface of the ejection column (4).

6. The pouring mold for the cement well lid as claimed in claim 5, wherein a top rod hole (204) is formed in the inner bottom surface of the rectangular notch (201); the lower surface of the strip-shaped column (302) is fixedly connected with a mandril (304) which is in clearance fit with the mandril hole (204), and the compression spring (303) is sleeved on the outer side of the mandril (304).

7. The pouring mold for the cement well lid as claimed in claim 6, wherein the circumferential surface of the center pillar (2) is provided with rectangular notches (201) and wedge notches (205) corresponding to each other one by one; the wedge notch (205) penetrates through the ejector rod hole (204) and is communicated with the ejector column hole (202);

a mounting block (5) is fixedly connected in the wedge block notch (205); the side surface of the mounting block (5) is connected with a plurality of springs (501), and the other ends of the springs (501) are connected with a wedge-shaped block (502); the wedge block (502) is provided with a through hole (503), and the wedge end of the wedge block (502) extends into the top column hole (202) and is used for supporting and fixing the upper die (3) by abutting against the upper surface of the wedge block (502) through the lower end of the top rod (304);

the upper end of the ejection column (4) is of a circular truncated cone-shaped structure, the conical surface is matched with the inclined surface of the wedge-shaped block (502) and used for moving upwards through the ejection column (4), extruding the wedge-shaped block (502) and generating position movement, the through hole (503) corresponds to the ejector rod hole (204) in position and is used for enabling the lower end of the ejector rod (304) to penetrate into the through hole (503) so as to realize downward movement of the upper die (3).

8. The casting mold for cement well lids as claimed in claim 7, wherein the lower end surface of the ejector rod (304) is of a spherical structure.

9. Pouring mould for cement manhole covers according to claim 7 or 8, characterized in that the outer port of the wedge notch (205) is a stepped groove structure; the mounting block (5) is of a T-shaped structure matched with the stepped groove structure.

10. Pouring mould for cement manhole covers according to claim 7 or 8, characterized in that the side of the mounting block (5) is an arc-shaped surface structure adapted to the circumferential surface of the center pillar (2).

Technical Field

The invention belongs to the technical field of cement well lid production, and particularly relates to a pouring mold for a cement well lid.

Background

The existing well covers generally comprise cast iron well covers, resin well covers and cement well covers. Cement mortar is poured in the mold during preparation of the cement well lid, the cement well lid is cured, and the shape and size of the well lid are adjusted through adjustment of the mold.

Like chinese utility model cn201520554878.x, discloses a cement well lid pouring mould, the body is equipped with the gas pocket in the bottom center department of body to and still weld the columnar body on the bottom surface of body. Therefore, the well lid mould of this structure is after cement well lid sclerosis shaping, and cement well lid takes out very inconveniently from this internal, or when the well lid takes out, needs overturn for the body back-off, so that the cement well lid drawing of patterns, this mode is not only intensity of labour great, also very easily causes cement well lid damage or fracture, seriously influences the life of cement well lid.

Simultaneously, current cement well lid need cooperate the well lid circle to use, and current cement well lid and well lid circle are for separately pouring, through mutually independent mould preparation, lead to when wearing and tearing or deformation appear in the mould, and well lid circle appear matching degree poor, or the condition that well lid circle can't be put into smoothly to the well lid for the cooperation precision when well lid and well lid circle use is poor.

Disclosure of Invention

The invention aims to provide a pouring mold for a cement well lid, which is characterized in that a well lid ring pouring groove for pouring a well lid ring is formed between a center pillar and a cylindrical boss, between a bottom plate and a cylindrical plate, and between the center pillar and the inner wall of a stepped hole of an upper mold, the well lid ring pouring groove for pouring the well lid is formed, so that the prepared well lid and the well lid ring are both based on the center pillar, the problem of poor matching precision when the existing well lid and the well lid ring are used is solved, meanwhile, the well lid is more convenient to separate from the upper mold through the movable connection between the upper mold and the center pillar, and the problem of inconvenience in taking out the existing well lid is solved.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a pouring mold for a cement well lid, which comprises a bottom mold, a middle column and an upper mold, wherein the bottom mold comprises a bottom plate; the upper surface of the bottom plate is fixedly connected with a cylindrical boss and a cylindrical plate which is concentric with the cylindrical boss; the upper end surface of the cylindrical boss is provided with a circular sinking groove which is concentrically arranged; the circumferential surface of the central column is provided with a plurality of rectangular notches; the lower end of the middle column is matched with the circular sinking groove; and a manhole cover ring pouring groove used for pouring the manhole cover ring is formed between the central column and the cylindrical boss as well as between the bottom plate and the cylindrical plate.

The upper surface of the upper die is provided with a stepped hole; the upper die is sleeved at the upper end of the center pillar through a stepped hole; the step surface of the stepped hole is fixedly connected with two upright posts; the lower surface of the upper die is fixedly connected with a strip-shaped column in clearance fit with the rectangular notch; the bar post lower surface is connected with compression spring, and the compression spring lower extreme offsets with the interior bottom surface of rectangular channel for make through compression spring and go up the mould and keep in center pillar upper end position, and form the well lid that is used for the well lid to pour between the up end of shoulder hole inner wall and center pillar and pour the groove.

Further, a flange is arranged on the outer wall of the cylindrical plate; the flange is provided with a connecting hole and is connected with the bottom plate through a bolt; the lower surface of the bottom plate is fixedly connected with a plurality of foot pads.

Furthermore, the cylinder plate comprises a plurality of arc-shaped plates and is formed by splicing the arc-shaped plates.

Furthermore, a top column hole communicated with the rectangular notch is formed in the lower end face of the middle column, and a top column is arranged in the top column hole; the inner bottom surface of the circular sinking groove is provided with a blind hole in clearance fit with the top column; a pressing block is rotationally connected in the rectangular notch; one end of the pressing block is abutted to the upper end of the ejection column, and the other end of the pressing block is abutted to the upper surface of the bar-shaped column and used for pushing the pressing block upwards through the ejection column so that the other end of the pressing block presses the bar-shaped column downwards and the upper die moves downwards.

Furthermore, the upper end of the top column is provided with a connecting hole; a connecting column is movably inserted in the connecting hole; the connecting column is sleeved with a buffer spring, and the upper end of the connecting column is fixedly connected with a top block; the upper surface of the ejector block abuts against the pressing block; the upper end of the buffer spring is abutted against the lower surface of the ejector block, and the lower end of the buffer spring is abutted against the upper end face of the ejection column.

Furthermore, a top rod hole is formed in the inner bottom surface of the rectangular notch; the lower surface of the bar-shaped column is fixedly connected with a mandril which is in clearance fit with the mandril hole, and the compression spring is sleeved on the outer side of the mandril.

Furthermore, the circumferential surface of the center pillar is provided with wedge block notches corresponding to the rectangular notches one to one; the notch of the wedge block penetrates through the ejector rod hole and is communicated with the ejection column hole; the inside of the wedge block notch is fixedly connected with an installation block; the side surface of the mounting block is connected with a plurality of springs, and the other ends of the springs are connected with a wedge-shaped block; the wedge-shaped block is provided with a through hole, and the wedge-shaped end of the wedge-shaped block extends into the top column hole and is used for abutting against the upper surface of the wedge-shaped block through the lower end of the top rod so as to support and fix the upper die; the upper end of the ejection column is of a round table-shaped structure, the conical surface is matched with the inclined surface of the wedge block and used for moving up through the ejection column, extruding the wedge block and moving the position, the through hole corresponds to the ejector rod hole and the lower end of the ejector rod penetrates into the through hole, and the position of the upper die moves down.

Furthermore, the lower end face of the ejector rod is of a spherical structure.

Further, the outer port of the wedge block notch is of a stepped groove structure; the mounting block is of a T-shaped structure matched with the stepped groove structure.

Furthermore, the side surface of the mounting block is of an arc-shaped surface structure matched with the circumferential surface of the center pillar.

The invention has the following beneficial effects:

according to the well lid and the well lid ring, the well lid ring pouring groove for pouring the well lid ring is formed among the cylindrical bosses of the center column and the bottom die, the bottom plate and the cylindrical plate, and the well lid pouring groove for pouring the well lid is formed between the center column and the inner wall of the stepped hole of the upper die, so that the prepared well lid and the prepared well lid ring are both based on the center column, and the matching precision of the well lid and the well lid ring in use is effectively improved.

Simultaneously, establish on the center pillar through last mould cover, through pushing down the mould, utilize the support of center pillar for the well lid of pouring the preparation breaks away from with last mould, realizes the drawing of patterns of well lid, great improvement the convenience that the well lid was taken out in by the mould.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced 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 that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a pouring mold for a cement manhole cover according to the present invention;

FIG. 2 is a top view of the structure of FIG. 1;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is an enlarged view of the structure of the B part of the boss 3;

FIG. 5 is a schematic structural view of the bottom mold;

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

FIG. 7 is a schematic structural view of a center pillar;

FIG. 8 is a half sectional view of the center pillar;

FIG. 9 is a schematic structural view of a center pillar and an upper mold;

FIG. 10 is a schematic structural view of an upper die;

FIG. 11 is a schematic structural view of a top pillar;

FIG. 12 is a schematic view of the construction of the mounting block and wedge block;

FIG. 13 is a schematic view of the well lid and well lid ring poured structure in this application

Fig. 14 is a schematic structural view of the well lid and the upper die when the well lid is demolded;

in the drawings, the components represented by the respective reference numerals are listed below:

1-bottom die, 2-middle post, 3-upper die, 4-top post, 5-installation block, 6-well cover ring, 7-well cover, 21-well cover ring pouring groove, 31-well cover pouring groove, 101-bottom plate, 102-cylindrical boss, 103-cylindrical plate, 104-circular sinking groove, 105-flange, 106-pad, 107-blind hole, 201-rectangular notch, 202-top post hole, 203-pressing block, 204-top rod hole, 205-wedge notch, 301-stepped hole, 302-bar post, 303-compression spring, 304-top rod, 305-upright post, 401-connecting hole, 402-connecting post, 403-buffer spring, 404-top block, 501-spring, 502-wedge block and 503-through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Example one

Referring to fig. 1, 2, 5 and 6, the invention relates to a casting mold for a cement well lid, which comprises a bottom mold 1, a middle column 2 and an upper mold 3. The bottom die 1 comprises a bottom plate 101; the upper surface of the bottom plate 101 is fixedly connected with a cylindrical boss 102 and a cylindrical plate 103 which is concentric with the cylindrical boss 102; the upper end surface of the cylindrical boss 102 is provided with a circular sinking groove 104 which is concentrically arranged.

Wherein, the outer wall of the cylindrical plate 103 is provided with a flange 105; the flange 105 is provided with a connecting hole and is connected with the bottom plate 101 through a bolt; the lower surface of the bottom plate 101 is welded or screwed with a plurality of foot pads 106, and the bottom plate 101 of the bottom die 1 is spaced from the ground by the foot pads 106, so that the cylindrical plate 103 and the bottom plate 101 can be conveniently connected by bolts or screws.

Meanwhile, the cylindrical plate 103 comprises two to four arc plates, four arc plates are shown in the figure, and the cylindrical plate is formed by splicing the four arc plates, namely, each arc plate is a one-tenth circle of bending, and the four arc plates are spliced into a complete cylindrical plate 103, so that the arc plates can be conveniently detached after pouring is finished, and the manhole cover ring is easy to demould.

As shown in fig. 3, 7 and 8, the circumferential surface of the center pillar 2 is provided with four rectangular notches 201; the lower end of the center pillar 2 is matched with the circular sinking groove 104, and when the positioning device is used, the center pillar 2 is directly placed in the circular sinking groove 104 on the cylindrical boss 102, and the position of the center pillar 2 is easily positioned through the circular sinking groove 104. A manhole cover ring pouring groove 21 for pouring a manhole cover ring is formed among the center pillar 2, the cylindrical boss 102, the bottom plate 101 and the cylindrical plate 103.

As shown in fig. 3, 9 and 10, a stepped hole 301 is formed on the upper surface of the upper die 3; the upper die 3 is sleeved at the upper end of the center pillar 2 through a stepped hole 301; two columns 305 are welded to the step surface of the stepped hole 301. The lower surface of the upper die 3 is in screw connection with a strip-shaped column 302 in clearance fit with the rectangular notch 201, and the end part of the strip-shaped column 302 extends into the rectangular notch 201. Bar post 302 lower surface is connected with compression spring 303, and compression spring 303 lower extreme offsets with the bottom surface in the rectangle notch 201, be used for the elasticity supporting role through compression spring 303, make and go up mould 3 and keep in 2 upper end positions of center pillar, and form the well lid that is used for the well lid to pour between the up end of shoulder hole 301 inner wall and center pillar 2 and pour groove 31, two stand 305 positions, even form two slotted holes on the well lid after pouring, be convenient for remove or overturn the well lid through the well lid drag hook.

As shown in fig. 13, after the bottom die 1, the center pillar 2 and the upper die 3 are connected with each other, cement is poured into the manhole cover ring pouring groove 21 and the manhole cover pouring groove 31, the manhole cover ring 6 and the manhole cover 7 can be obtained after the cement is hardened, and the prepared manhole cover 7 and the manhole cover ring 6 are both based on the center pillar 2, so that the matching precision of the manhole cover 7 and the manhole cover ring 6 in use is greatly improved.

As shown in fig. 14, during demolding, the upper mold 3 is pressed downward, so that the position of the upper mold 3 moves downward, the well lid 7 is separated from the upper mold 3 under the support of the upper end of the center pillar 2, the well lid 7 is more convenient to demold, the well lid 7 is sequentially lifted up, the upper mold 3 and the center pillar 2 are lifted up, the center pillar 2 is separated from the bottom mold 1, and the center pillar 2 is separated from the well lid ring 6.

Finally, dismantle the arc one by one, dismantle the back, can be convenient for lift up manhole cover circle 6 from bottom plate 101, realize the drawing of patterns to make the casting die of this application, great improvement the convenience that well lid 7 and manhole cover circle 6 were taken out in by the mould.

Example two

In the first embodiment, as shown in fig. 3, 4, 7 and 8, a top pillar hole 202 communicating with the rectangular notch 201 is formed in the lower end surface of the center pillar 2, the top pillar 4 is installed in the top pillar hole 202, the top pillar 4 is axially movable in the top pillar hole 202, and the lower end of the top pillar 4 extends out of the top pillar hole 202. The bottom surface in the circular sinking groove 104 is provided with a blind hole 107 in clearance fit with the top pillar 4, or the through hole can be formed, so that after the center pillar 2 is matched with the circular sinking groove 104, the lower end of the top pillar 4 is positioned in the blind hole 107, and upward extrusion on the top pillar 4 can not be generated.

The rectangular notch 201 is rotatably connected with a pressing block 203, one end of the pressing block 203 abuts against the upper end of the top column 4, and the other end of the pressing block 203 abuts against the upper surface of the bar-shaped column 302 and is used for pushing the pressing block 203 upwards through the top column 4, so that the other end of the pressing block 203 presses the bar-shaped column 302 downwards, and the position of the upper die 3 moves downwards.

As shown in fig. 14, specifically, when the well lid 7 needs to be demolded, the upper die 3 and the center pillar 2 are lifted away from the bottom die 1 together, the upper die 3 and the center pillar 2 are placed on the ground, under the action of self gravity, the top pillar 4 relatively moves towards the inside of the top pillar hole 202, namely, the top pillar 4 relatively moves upwards relative to the center pillar 2, so that the upper end of the top pillar 4 upwards pushes the pressing block 203, the pressing block 203 rotates, so that the bar-shaped pillar 302 is pressed downwards through the other end of the pressing block 203, so that the upper die 3 receives downward pulling force, the upper die 3 relatively moves downwards relative to the center pillar 2, so that the upper die 3 is separated from the well lid 7, and the demolding of the well lid 7 is facilitated through the actions of the top pillar 4 and the pressing block 203.

Meanwhile, as shown in fig. 4 and 11, the upper end of the top pillar 4 is provided with a connecting hole 401; a connecting column 402 is movably inserted into the connecting hole 401; the connecting column 402 is sleeved with a buffer spring 403, and the upper end of the connecting column 402 is fixedly connected with a top block 404. The upper surface of the top block 404 is abutted against the pressing block 203; the upper end of the buffer spring 403 abuts against the lower surface of the top block 404, and the lower end abuts against the upper end surface of the top pillar 4.

Go up mould 3 and center pillar 2 and place subaerial in-process, the fore-set 4 realizes the buffering through buffer spring 403 at the removal in-process for the ejecting piece 404 pushes away the effect more mitigately downwards that produces briquetting 203, avoids causing the condition emergence that produces between mould 3 and well lid 7 and draw the wound. And after the shore 4 got into in the shore hole 202 completely, go up mould 3 and well lid 7 under the condition that still does not break away from, accessible external force will go up mould 3 and push down, supplementary mould 3 and well lid 7 break away from for go up mould 3 and well lid 7 break away from the process more controlled, can effectually avoid going up the condition emergence that produces between mould 3 and well lid 7 and draw or damage.

EXAMPLE III

On the basis of the second embodiment, a mandril hole 204 is formed in the inner bottom surface of the rectangular notch 201; the lower surface of the bar-shaped column 302 is welded or connected with the ejector rod 304 in a threaded manner, the ejector rod hole 204 is in clearance fit with the ejector rod 304, the compression spring 303 is sleeved on the outer side of the ejector rod 304, and the compression spring 303 is sleeved on the ejector rod 304, so that the supporting acting force of the compression spring 303 is more stable and reliable.

Meanwhile, the circumferential surface of the center pillar 2 is provided with rectangular notches 201 and wedge notches 205 corresponding to each other one by one, the wedge notches 205 are located below the rectangular notches 201, and the wedge notches 205 penetrate through the ejector rod hole 204 and are communicated with the ejector pillar hole 202. A mounting block 5 is fixedly connected within the wedge pocket 205.

Specifically, the outer port of voussoir notch 205 is the ladder groove structure to set up threaded hole on the ladder face, installation piece 5 be with the T shape structure of ladder groove structure adaptation, set up the through hole that corresponds with the screw hole on the installation piece 5, thereby make installation piece 5 fix in voussoir notch 205 through the screw.

Moreover, the side surface of the mounting block 5 is an arc surface structure matched with the circumferential surface of the center pillar 2, so that the circumferential surface of the center pillar 2 is kept completely flush after the mounting block 5 is mounted with the wedge notch 205.

Two springs 501 are connected to the side of the mounting block 5, and a wedge block 502 is connected to the other ends of the two springs 501. Specifically, the side surface of the mounting block 5 is welded or screwed with two guide posts, and the guide posts are sleeved with springs 501. The side of the wedge-shaped block 502 is provided with a guide hole matched with the guide post, so that the connection between the mounting block 5 and the wedge-shaped block 502 and the relative movement of the wedge-shaped block 502 are more stable and reliable.

As shown in fig. 3 and 4, the wedge block 502 is provided with a through hole 503, and a wedge end of the wedge block 502 extends into the top column hole 202, so as to support and fix the upper die 3 by abutting a lower end of the top rod 304 against an upper surface of the wedge block 502.

During pouring, the lower end of the top post 4 is located in the blind hole 107, the upper die 3 is kept at the upper end of the middle post 2 under the action of the compression spring 303, at the moment, the lower end of the ejector rod 304 is located above the wedge-shaped block 502, the wedge-shaped end of the wedge-shaped block 502 extends into the top post hole 202 under the action of the spring 501, and the through hole 503 is staggered with the ejector rod hole 204, namely, when the upper die 3 is pressed down, the lower end of the ejector rod 304 abuts against the upper surface of the wedge-shaped block 502, so that the supporting effect on the upper die 3 is realized, and the stability of the upper die 3 during pouring is ensured.

The upper end of the ejection column 4 is of a circular truncated cone-shaped structure, the conical surface is matched with the inclined surface of the wedge block 502, the wedge block 502 is extruded by moving the ejection column 4 upwards, the wedge block 502 moves, the wedge end of the wedge block 502 retracts into the wedge block notch 205, the through hole 503 corresponds to the ejection rod hole 204 at the moment, the pressing block 203 is pushed downwards to push the strip-shaped column 302 downwards under the action of pushing the ejection column 4 upwards, the lower end of the ejection rod 304 is inserted into the through hole 503, and the downward movement of the position of the upper die 3 is achieved.

Meanwhile, the lower end surface of the ejector rod 304 is of a spherical structure, and the spherical structure is in contact with the upper surface of the wedge block 502, so that the friction force between the wedge block 502 and the ejector column 4 can be effectively reduced, and the wedge block 502 can conveniently move under the extrusion action of the ejector column 4.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.