CN214395266U - Injection molding mold with inverted buckle - Google Patents

Abstract

The utility model discloses an injection molding part injection mold with a back-off, which comprises a fixed mold, a movable mold, a left slider, a right slider, a left toggle assembly, a right toggle assembly, a left pushing assembly and a right pushing assembly; the fixed die is provided with a fixed die inner cavity with a downward opening; the top of the movable mould is provided with a movable mould core protruding upwards; the left sliding block and the right sliding block are respectively arranged on the left side and the right side of the movable mould core, and the left sliding block and the right sliding block are in sliding connection with the fixed mould; the movable die buckles the left sliding block and the right sliding block through the left shifting buckle component and the right shifting buckle component, and the left pushing component and the right pushing component respectively push the left sliding block and the right sliding block. The utility model discloses the drawing of patterns is efficient.

Description

Injection molding mold with inverted buckle

Technical Field

The utility model relates to a field of moulding plastics especially indicates a take back-off injection molding injection mold.

Background

At present, the outsides of many injection molding parts are provided with sunken inversed buckles, and the inversed buckles of the injection molding parts are generally formed by insert blocks; however, in the conventional injection mold for forming these injection-molded parts with undercuts, the insert blocks need to be taken out one by one when the mold is opened, which causes low demolding efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an efficient injection mold of taking back-off injection molding of drawing of patterns in order to solve not enough among the prior art.

In order to achieve the above purpose, the solution of the present invention is:

an injection mold for injection molding parts with back-off comprises a fixed mold, a movable mold, a left slide block, a right slide block, a left toggle assembly, a right toggle assembly, a left pushing assembly and a right pushing assembly; the fixed die is provided with a fixed die inner cavity with a downward opening; the top of the movable mould is provided with a movable mould core protruding upwards; the left sliding block and the right sliding block are respectively arranged on the left side and the right side of the movable mould core, and the right side of the left sliding block and the left side of the right sliding block are respectively provided with a left back-off forming block and a right back-off forming block; when the fixed die and the movable die are assembled, the movable die core, the left slide block and the right slide block penetrate into the inner cavity of the fixed die from bottom to bottom, and an injection molding part forming cavity is formed among the fixed die, the movable die, the left slide block and the right slide block; the front side and the rear side of the left sliding block are respectively provided with a left guiding through groove which is obliquely arranged from top to bottom to left, and the front side and the rear side of the right sliding block are respectively provided with a right guiding through groove which is obliquely arranged from top to bottom to right; two left guide blocks and two right guide blocks are matched in the cavity of the fixed die, the two left guide blocks are respectively provided with a left guide rail which is obliquely arranged leftwards from top to bottom, the left guide rails of the two left guide blocks are respectively in sliding connection with left guide through grooves on two sides of the front side of the left sliding block, the two right guide blocks are respectively provided with a right guide rail which is obliquely arranged rightwards from top to bottom, and the right guide rails of the two right guide blocks are respectively in sliding connection with right guide through grooves on two sides of the front side of the right sliding block; the left shifting buckle assembly comprises a left lower buckle block fixed at the bottom of the left sliding block and a left upper buckle block fixed on the left side of the top of the movable die, the left lower buckle block is provided with a left lower inclined guide surface inclined downwards from left to right, the left upper buckle block is provided with a left upper inclined guide surface inclined upwards from right to left, the left upper inclined guide surface of the left upper buckle block buckles the left lower inclined guide surface of the left lower buckle block from top to bottom, and the left upper inclined guide surface is in sliding connection with the left lower inclined guide surface; the right shifting buckle component comprises a right lower buckle block fixed at the bottom of the right sliding block and a right upper buckle block fixed at the right side of the top of the movable die, the right lower buckle block is provided with a right lower inclined guide surface inclined downwards from right to left, the right upper buckle block is provided with a right upper inclined guide surface inclined upwards from left to right, the right upper inclined guide surface of the right upper buckle block buckles the right lower inclined guide surface of the right lower buckle block from top to bottom, and the right upper inclined guide surface is in sliding connection with the right lower inclined guide surface; the left pushing assembly comprises a left guide pillar and a left spring sleeved with the left guide pillar; the left guide pillar is connected with the fixed mold, the left guide pillar is obliquely arranged from top to bottom to left, the lower end of the left guide pillar extends into the inner cavity of the fixed mold, the inner walls of the left sliding block and the inner cavity of the fixed mold are respectively provided with a left lower guide hole and a left upper guide hole which are obliquely arranged from top to bottom to left corresponding to the left guide pillar, the left guide pillar and a left spring sleeved on the left guide pillar are inserted into the left upper guide hole and the left lower guide hole corresponding to the left guide pillar, and the upper end and the lower end of the left spring are respectively abutted against the left sliding block and the fixed mold; the right pushing assembly comprises a right guide pillar and a right spring sleeved with the right guide pillar; the right guide pillar is connected with the fixed die, the right guide pillar is arranged in a right inclined mode from top to bottom, the lower end of the right guide pillar extends into the inner cavity of the fixed die, the right lower guide hole and the right upper guide hole which are arranged in a right inclined mode from top to bottom are formed in the inner wall of the inner cavity of the fixed die corresponding to the right guide pillar respectively, the right guide pillar and a right spring sleeved on the right guide pillar are inserted into the right upper guide hole and the right lower guide hole corresponding to the right guide pillar, and the upper end and the lower end of the right spring are abutted to the right slide block and the fixed die respectively.

The fixed die comprises a fixed die top plate and a fixed die body; the upper end of the fixed die body is connected with the fixed die top plate, the fixed die inner cavity is formed in the fixed die body, and the fixed die top plate is provided with a material injection hole communicated with the fixed die inner cavity.

The injection molding part injection mold with the back-off function further comprises a plurality of guide pillars, each guide pillar is connected with the movable mold and arranged in the up-down direction, and the fixed mold is in sliding connection with each guide pillar.

The fixed die is provided with a plurality of fixed die sliding holes which are respectively sleeved with the guide pillars in a sliding manner, and fixed die sliding sleeves sleeved with the guide pillars are matched in the fixed die sliding holes.

The injection molding piece injection mold with the reverse buckle further comprises a base, and the base is connected with the bottom of the movable mold.

The base comprises a bottom plate and a plurality of supporting plates, the lower ends of the supporting plates are connected with the bottom plate, and the upper ends of the supporting plates are connected with the bottom of the movable mold.

After the scheme is adopted, the utility model discloses when carrying out the die sinking, move the movable mould down for the cover half, the movable mould moves down for the cover half can make the upper left inclined guide surface of the upper left knot piece that links to each other with the movable mould top oppress the lower left inclined guide surface of the lower left knot piece that links to each other with left slider bottom and order about left slider to move left, and meanwhile, the movable mould moves down for the cover half still can make the upper right inclined guide surface of the upper right knot piece that links to each other with the movable mould top oppress the lower right inclined guide surface of the lower right knot piece that links to each other with right slider bottom and order about right slider to move right, so in the process that the movable mould moves down for the cover half, left slider and right slider can move dorsad and make left slider and right slider break away from the back-off of injection molding, realize the back-off drawing of patterns; when the left slide block and the right slide block move back to the state that the left upper oblique guide surface of the left upper buckling block is separated from the left lower oblique guide surface of the left lower buckling block and the right upper oblique guide surface of the right upper buckling block is separated from the right lower oblique guide surface of the right lower buckling block, the left slide block and the right slide block are separated from the reverse buckle of the injection molding piece, and then the left slide block and the right slide block move obliquely downwards relative to the fixed die under the elastic force action of a left spring of the left pushing assembly and a right spring of the right pushing assembly respectively, so that the left slide block and the right slide block are completely separated from the injection molding piece, and the demolding is finished; wherein at the removal in-process of left slider and right slider, under the cooperation of the left guide through groove of left slider and the left guide rail of left guide block and under the cooperation of the right guide through groove of right slider and the right guide rail of right guide block, left slider and right slider can with the sliding connection of cover half for left slider and right slider remove smoothly.

By the way, the utility model discloses after the injection molding shaping, only need the movable mould to move down for the cover half just can make left slider and right slider break away from the back-off of injection molding earlier and break away from the injection molding again completely, whole drawing of patterns easy operation, the drawing of patterns is efficient.

Drawings

Fig. 1 is an exploded view 1 of the present invention;

fig. 2 is an exploded view 2 of the present invention;

fig. 3 is a cross-sectional view 1 of the present invention;

fig. 4 is a cross-sectional view of the present invention 2;

fig. 5 is a cross-sectional view 3 of the present invention;

description of reference numerals:

the fixed die 1, the fixed die top plate 11, the fixed die body 12, the fixed die inner cavity 121, the left upper guide hole 122, the right upper guide hole 123, the fixed die sliding hole 124, the fixed die sliding sleeve 13, the left guide block 14, the left guide rail 141, the right guide block 15, the right guide rail 151,

the moving die 2, the moving die core 21,

a left slide block 3, a left back-off forming block 31, a left guide through groove 32, a left lower guide hole 33,

a right slide block 4, a right inverted buckle forming block 41, a right guide through groove 42, a right lower guide hole 43,

a left toggle component 5, a left lower buckle block 51, a left lower inclined guide surface 511, a left upper buckle block 52, a left upper inclined guide surface 521,

a right toggle component 6, a right lower buckle block 61, a right lower inclined guide surface 611, a right upper buckle block 62, a right upper inclined guide surface 621,

a left pushing component 7, a left guide post 71, a left spring 72,

a right pushing component 8, a right guide post 81, a right spring 82,

the guide post (9) is provided with a guide post,

the base 10, the bottom plate 101, the support plate 102,

injection-molded part A, undercut A1.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.

As shown in fig. 1 to 5, the utility model discloses a take back-off injection molding injection mold, it includes cover half 1, movable mould 2, left slider 3, right slider 4, a left side group's knot subassembly 5, a right side group's knot subassembly 6, a left side promotion subassembly 7 and a right side promotion subassembly 8.

As shown in fig. 1, the fixed die 1 is provided with a fixed die inner cavity 121 with a downward opening; the top of the movable mould 2 is provided with a movable mould core 21 protruding upwards; the left slide block 3 and the right slide block 4 are respectively arranged at the left side and the right side of the movable mould core 21, the right side of the left slide block 3 and the left side of the right slide block 4 are respectively provided with a left back-off forming block 31 and a right back-off forming block 41, and the left back-off forming block 31 and the right back-off forming block 41 are used for forming a back-off A1 of the injection molding piece A; when the fixed die 1 and the movable die 2 are closed, the movable die core 21, the left slider 3 and the right slider 4 penetrate into the fixed die inner cavity 121 from bottom to bottom, an injection molding part molding cavity is formed among the fixed die 1, the movable die 2, the left slider 3 and the right slider 4, the injection molding part molding cavity is used for forming an injection molding part A with an inverted buckle A1, and the inverted buckle of the injection molding part A is molded through the left inverted buckle molding block 31 and the right inverted buckle molding block 41.

As shown in fig. 1 to 5, the fixed die 1 may include a fixed die top plate 11, a fixed die body 12 and a fixed die body 12; the upper end of the fixed die body 12 is connected with the fixed die top plate 11, the fixed die inner cavity 121 is formed in the fixed die body 12, the fixed die top plate 11 is provided with a material injection hole communicated with the fixed die inner cavity 121, and a nozzle of the injection molding machine can inject injection molding material into an injection molding part molding cavity formed among the fixed die 1, the movable die 2, the left slider 3 and the right slider 4 through the material injection hole to mold an injection molding part A.

As shown in fig. 1, 2 and 5, the front and rear sides of the left slider 3 are respectively provided with a left guiding through groove 32 inclined from top to bottom to left, and the front and rear sides of the right slider 4 are respectively provided with a right guiding through groove 42 inclined from top to bottom to right; two left guide blocks 14 and two right guide blocks 15 are matched in a fixed die inner cavity 121 of the fixed die 1, the left guide blocks 14 and the right guide blocks 15 can be connected with the fixed die 1 in a welding or screw locking mode, the two left guide blocks 14 are respectively provided with a left guide rail 141 which is inclined leftwards from top to bottom, the left guide rails 141 of the two left guide blocks 14 are respectively in sliding connection with the left guide through grooves 32 on the two sides of the front side of the left sliding block 3, the two right guide blocks 15 are respectively provided with a right guide rail 151 which is inclined rightwards from top to bottom, and the right guide rails 151 of the two right guide blocks 15 are respectively in sliding connection with the right guide through grooves 42 on the two sides of the front side of the right sliding block 4.

As shown in fig. 1 to 3, the left toggle assembly 5 includes a left lower buckle block 51 fixed at the bottom of the left slider 3 and a left upper buckle block 52 fixed at the left side of the top of the moving die 2, the left lower buckle block 51 is provided with a left lower inclined guide surface 511 inclined downward from left to right, the left upper buckle block 52 is provided with a left upper inclined guide surface 521 inclined upward from right to left, the left upper inclined guide surface 521 of the left upper buckle block 52 buckles the left lower inclined guide surface 511 of the left lower buckle block 51 from top to bottom, and the left upper inclined guide surface 521 is in sliding connection with the left lower inclined guide surface 511; the right toggle assembly 6 includes a right lower toggle block 61 fixed at the bottom of the right slider 4 and a right upper toggle block 62 fixed at the right side of the top of the movable mold 2, the right lower toggle block 61 is provided with a right lower inclined guide surface 611 inclined downward from right to left, the right upper toggle block 62 is provided with a right upper inclined guide surface 621 inclined upward from left to right, the right upper inclined guide surface 621 of the right upper toggle block 62 buckles the right lower inclined guide surface 611 of the right lower toggle block 61 from top to bottom, and the right upper inclined guide surface 621 is in sliding connection with the right lower inclined guide surface 611.

As shown in fig. 1, 2 and 4, the left pushing assembly 7 includes a left guide post 71 and a left spring 72 sleeved on the left guide post 71; the left guide pillar 71 is connected with the fixed die 1, the left guide pillar 71 is obliquely arranged from top to bottom to left, the lower end 71 of the left guide pillar extends into the inner cavity 121 of the fixed die, the inner walls of the left slider 3 and the inner cavity 121 of the fixed die are respectively provided with a left lower guide hole 33 and a left upper guide hole 122 which are obliquely arranged from top to bottom to left corresponding to the left guide pillar 71, the left guide pillar 71 and the left spring 72 sleeved on the left guide pillar 71 are both inserted into the left upper guide hole 122 and the left lower guide hole 33 corresponding to the left guide pillar 71, the upper end and the lower end of the left spring 72 are respectively abutted against the left slider 3 and the fixed die 1, the left spring 72 can apply pressure to the left slider 3 to enable the left slider 3 to be tightly abutted against the inner cavity 121 of the fixed die and the top of the movable die 2, meanwhile, the pressure applied to the left lower fastening block 51 by the left upper fastening block 52 is reduced to prevent the left lower fastening block 51 from being damaged, and the left spring 72 is sleeved on the left guide pillar 71 to prevent the left spring 72 from deflecting. The right pushing assembly 8 comprises a right guide post 81 and a right spring 82 sleeved on the right guide post 81; the right guide post 81 is connected with the fixed die 1, the right guide post 81 is arranged obliquely rightwards from top to bottom, the lower end of the right guide post 81 extends into the inner cavity 121 of the fixed die, the inner walls of the right sliding block 4 and the inner cavity 121 of the fixed die are respectively provided with a right lower guide hole 43 and a right upper guide hole 123 which are arranged obliquely rightwards from top to bottom corresponding to the right guide post 81, the right guide post 81 and a right spring 82 sleeved with the right guide post 81 are both inserted into the right upper guide hole 123 and the right lower guide hole 43 corresponding to the right guide post 81, the upper end and the lower end of the right spring 82 respectively abut against the right sliding block 4 and the fixed die 1, the right spring 82 can apply pressure to the right sliding block 4 to enable the right sliding block 4 to tightly abut against the inner cavity 141 of the fixed die and the top of the movable die 2, meanwhile, the pressure applied to the right lower buckling block 61 by the right upper buckling block 62 is reduced to avoid the damage of the right lower buckling block 61, and the right spring 82 is sleeved with the right guide post 81 to avoid the deflection of the right spring 82.

The utility model discloses when carrying out the die sinking, move movable mould 2 down for cover half 1, movable mould 2 moves down for cover half 1 and can make the upper left inclined guide surface 521 of the upper left knot piece 52 that links to each other with movable mould 2 top oppress the lower left inclined guide surface 511 of the lower left knot piece 51 that links to each other with left slider 3 bottom and order about left slider 3 to move left, and meanwhile, movable mould 2 moves down for cover half 1 still can make the upper right inclined guide surface 621 of the upper right knot piece 62 that links to each other with movable mould 2 top oppress the lower right inclined guide surface 611 of the lower right knot piece 61 that links to each other with right slider 4 bottom and order about right slider 61 to move right, in-process that movable mould 2 moved down for cover half 1 like this, left slider 3 and right slider 4 can move dorsad and make left slider 3 and right slider 4 break away from the back-off of injection molding, realize the back-off drawing of patterns; when the left slide block 3 and the right slide block 4 move back to the position where the left upper inclined guide surface 521 of the left upper buckling block 52 is separated from the left lower inclined guide surface 511 of the left lower buckling block 51 and the right upper inclined guide surface 621 of the right upper buckling block 62 is separated from the right lower inclined guide surface 611 of the right lower buckling block 61, both the left slide block 3 and the right slide block 4 are separated from the inverted buckle a1 of the injection molding piece a, and then the left slide block 3 and the right slide block 4 move obliquely downwards relative to the fixed mold 1 under the elastic force action of the left spring 72 of the left pushing assembly 7 and the right spring 82 of the right pushing assembly 8 respectively, so that the left slide block 3 and the right slide block 4 are completely separated from the injection molding piece a, thereby completing the demolding; in the moving process of the left slider 3 and the right slider 4, under the matching of the left guiding through groove 32 of the left slider 3 and the left guide rail 141 of the left guide block 14 and under the matching of the right guiding through groove 42 of the right slider 4 and the right guide rail 151 of the right guide block 15, the left slider 3 and the right slider 4 can keep sliding connection with the fixed die 1, so that the left slider 3 and the right slider 4 can move smoothly.

By the way, the utility model discloses after injection molding A shaping, only need move down movable mould 2 for cover half 1 and just can make left slider 3 and right slider 4 take off injection molding A's back-off A1 earlier and break away from injection molding A again completely, whole drawing of patterns easy operation, the drawing of patterns is efficient.

The utility model can also comprise a plurality of guide pillars 9, each guide pillar 9 is connected with the movable mold 1, and each guide pillar 9 is arranged along the up-down direction, the fixed mold body 12 of the fixed mold 1 is connected with each guide pillar 5 in a sliding way, so that the movable mold 2 can accurately move up and down, and meanwhile, the fixed mold 1 and the movable mold 2 are accurately positioned; specifically, the fixed mold body 12 of the fixed mold 1 is provided with a plurality of fixed mold sliding holes 124 for respectively slidably sleeving the guide pillars 5, the fixed mold sliding holes 124 are matched with the fixed mold sliding sleeve 13 for sleeving the guide pillars 5, and the friction force between the fixed mold sliding sleeve 13 and the guide pillars 5 is small, so that the fixed mold 1 can smoothly move up and down.

As shown in fig. 1, the utility model may further comprise a base 10, wherein the base 10 is connected with the bottom of the movable mold 2, the movable mold 2 can be stably placed through the base 10, and the space between the base 10 and the fixed mold 2 can limit the stroke of the left slider 3 and the right slider 4; the base 10 includes a bottom plate 101 and a plurality of support plates 102 connected to the bottom plate 101 at their lower ends, and each support plate 102 is connected to the bottom of the movable mold 2 at its upper end.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.

Claims (6)

1. The utility model provides a take back-off injection molding injection mold which characterized in that: the device comprises a fixed die, a movable die, a left sliding block, a right sliding block, a left toggle assembly, a right toggle assembly, a left pushing assembly and a right pushing assembly;

the fixed die is provided with a fixed die inner cavity with a downward opening; the top of the movable mould is provided with a movable mould core protruding upwards; the left sliding block and the right sliding block are respectively arranged on the left side and the right side of the movable mould core, and the right side of the left sliding block and the left side of the right sliding block are respectively provided with a left back-off forming block and a right back-off forming block; when the fixed die and the movable die are assembled, the movable die core, the left slide block and the right slide block penetrate into the inner cavity of the fixed die from bottom to bottom, and an injection molding part forming cavity is formed among the fixed die, the movable die, the left slide block and the right slide block;

the front side and the rear side of the left sliding block are respectively provided with a left guiding through groove which is obliquely arranged from top to bottom to left, and the front side and the rear side of the right sliding block are respectively provided with a right guiding through groove which is obliquely arranged from top to bottom to right; two left guide blocks and two right guide blocks are matched in the cavity of the fixed die, the two left guide blocks are respectively provided with a left guide rail which is obliquely arranged leftwards from top to bottom, the left guide rails of the two left guide blocks are respectively in sliding connection with left guide through grooves on two sides of the front side of the left sliding block, the two right guide blocks are respectively provided with a right guide rail which is obliquely arranged rightwards from top to bottom, and the right guide rails of the two right guide blocks are respectively in sliding connection with right guide through grooves on two sides of the front side of the right sliding block;

the left shifting buckle assembly comprises a left lower buckle block fixed at the bottom of the left sliding block and a left upper buckle block fixed on the left side of the top of the movable die, the left lower buckle block is provided with a left lower inclined guide surface inclined downwards from left to right, the left upper buckle block is provided with a left upper inclined guide surface inclined upwards from right to left, the left upper inclined guide surface of the left upper buckle block buckles the left lower inclined guide surface of the left lower buckle block from top to bottom, and the left upper inclined guide surface is in sliding connection with the left lower inclined guide surface;

the right shifting buckle component comprises a right lower buckle block fixed at the bottom of the right sliding block and a right upper buckle block fixed at the right side of the top of the movable die, the right lower buckle block is provided with a right lower inclined guide surface inclined downwards from right to left, the right upper buckle block is provided with a right upper inclined guide surface inclined upwards from left to right, the right upper inclined guide surface of the right upper buckle block buckles the right lower inclined guide surface of the right lower buckle block from top to bottom, and the right upper inclined guide surface is in sliding connection with the right lower inclined guide surface;

the left pushing assembly comprises a left guide pillar and a left spring sleeved with the left guide pillar; the left guide pillar is connected with the fixed mold, the left guide pillar is obliquely arranged from top to bottom to left, the lower end of the left guide pillar extends into the inner cavity of the fixed mold, the inner walls of the left sliding block and the inner cavity of the fixed mold are respectively provided with a left lower guide hole and a left upper guide hole which are obliquely arranged from top to bottom to left corresponding to the left guide pillar, the left guide pillar and a left spring sleeved on the left guide pillar are inserted into the left upper guide hole and the left lower guide hole corresponding to the left guide pillar, and the upper end and the lower end of the left spring are respectively abutted against the left sliding block and the fixed mold;

the right pushing assembly comprises a right guide pillar and a right spring sleeved with the right guide pillar; the right guide pillar is connected with the fixed die, the right guide pillar is arranged in a right inclined mode from top to bottom, the lower end of the right guide pillar extends into the inner cavity of the fixed die, the right lower guide hole and the right upper guide hole which are arranged in a right inclined mode from top to bottom are formed in the inner wall of the inner cavity of the fixed die corresponding to the right guide pillar respectively, the right guide pillar and a right spring sleeved on the right guide pillar are inserted into the right upper guide hole and the right lower guide hole corresponding to the right guide pillar, and the upper end and the lower end of the right spring are abutted to the right slide block and the fixed die respectively.

2. The injection mold of claim 1, wherein: the fixed die comprises a fixed die top plate and a fixed die body;

the upper end of the fixed die body is connected with the fixed die top plate, the fixed die inner cavity is formed in the fixed die body, and the fixed die top plate is provided with a material injection hole communicated with the fixed die inner cavity.

3. The injection mold of claim 1, wherein: the fixed die is connected with the movable die in a sliding mode, and the fixed die is connected with the guide posts in a sliding mode.

4. The injection mold of claim 3, wherein: the fixed die is provided with a plurality of fixed die sliding holes which are respectively sleeved with the guide pillars in a sliding manner, and fixed die sliding sleeves sleeved with the guide pillars are matched in the fixed die sliding holes.

5. The injection mold of claim 1, wherein: the base is connected with the bottom of the movable die.

6. The injection mold of claim 5, wherein: the base comprises a bottom plate and a plurality of supporting plates, the lower ends of the supporting plates are connected with the bottom plate, and the upper ends of the supporting plates are connected with the bottom of the movable mold.

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