JPH071432A - Form device for centrifugal molding - Google Patents

Abstract

PURPOSE:To eliminate the need for the attachment and detachment of a core at the time of demolding and assembling by installing front and rear end plates, right and left side panels, and a lid on a base equipped with a bottom part to be able to be opened and closed, supporting a specified expansion-contraction mechanism which is installed in the core which forms a hollow part with a support beam, and fixing the support beam on the shaft of a holding arm which is installed on the base extendingly to be able to swing upward. CONSTITUTION:Front and rear end plates 50, 60 and right and left panels are fixed to a base 10 with hinges, and a lid is fixed on the side panels with a hinge. A core 80 is divided into an upper core 81 and a lower core 88, and joints 81J, 88J are installed which can be sealed at the time of width expansion. Connection fixtures 82, 89 installed close to the upper joint 81J and the lower joint 88J are connected with the output terminal 260b of a core expansion-contraction mechanism 200 which converts the rotation of a screw shaft with a rotary head 210 installed at the end into horizontal expansion-contraction movement with a bell crank, and the screw shaft is supported on a fixture 84 installed hangingly to the upper core 81. A support frame 85 is fixed to the rotation center of the core of the fixture 84, and a support beam 20 fixed on the shaft of a support arm 15 which is installed on the base 10 is inserted into the support frame 85.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal force forming frame device useful for labor-saving production, in which, when centrifugally forming a hollow body block having an arbitrary shape, assembling and demolding can be easily performed in a short time.

[0002]

2. Description of the Related Art When centrifugally molding a hollow body block having a square cross section, a base provided with a bottom portion is hinged to front and rear gable plates, and left and right side plates and an upper lid are respectively screwed and provided. Since the core device with the expansion / contraction mechanism inserted into the front and rear end plates is used to form the formwork device, the core inserted through the front and back end plate is reduced at the time of demolding (when removing the product from the formwork device). When pulling out to the outside, the left and right side plates and the upper lid are individually released to remove the product, and at the time of placement (when driving the product), after assembling the formwork device excluding the core, attach the core to the front and rear grate plates. It is necessary to insert the core and widen and fix the core.
I investigated the prior art, which required 0 to 50 minutes, but could not find a mold device for centrifugal force molding that does not require the removal and attachment of the core.

[0003]

PROBLEM TO BE SOLVED BY THE INVENTION It is an object of the present invention to provide a mold device for centrifugal force molding, which can be easily demolded and placed in a short time and is useful for labor-saving and automated production.

[0004]

In order to solve the above-mentioned problems, according to claim 1, a front-rear end plate, left and right side plates, and an upper lid are provided so as to be openable and closable, and a centrifugal force forming device is provided with a core having an expansion / contraction mechanism inside. In a formwork device, a core of an arbitrary shape is divided into an upper core and a lower core having joints that can be sealed during widening, and upper and lower joints are provided near the inside of each of the upper and lower joints. The bell crank upper end connecting hole formed in a substantially L shape is pivotally attached to the upper connecting part, the bell crank intermediate connecting hole is pivotally attached to the lower connecting part, and the bell crank tip connecting hole is screwed. Connected to the output end of a core expansion / contraction mechanism that converts the rotational movement of the shaft into a lateral expansion / contraction motion, and pivotally supports the screw shaft on a mounting metal fitting hung on the upper core, near the center of rotation of the core of the mounting metal fitting. A support frame is fixed to the base, and it can be swung upwards on a support arm extending from the rear of the base. A core support 粱 which pivotally attached to said inserted through the right and left direction of the clearance (gap) is provided on the supporting frame constitutes a centrifugal molding form and wherein the.

According to a second aspect of the present invention, the core expanding / contracting mechanism has a screw shaft having a head for rotation and a plurality of sets of threaded parts having different phases.
Slide nuts each provided with a link connecting part are screwed together, and one end of the link is rotatably attached to the link connecting part of the slide nut, and the other end is assembled to be rotatably connected to the vertical shaft part of the cross joint. 2. The centrifugal force forming mold device according to claim 1, wherein the core expansion / contraction mechanism is formed by connecting a connecting portion orthogonal to the vertical axis of the cross joint to a tip connecting hole of the bell crank. ing.

According to a third aspect of the present invention, the front-rear gable plate provided on the base so as to be openable and closable is a front-and-back gable plate having a tire which can be rotatably supported on the outer peripheral portion thereof. It constitutes a frame device.

[0007]

Function When the head for rotating the core expansion / contraction mechanism is rotated to the right at the time of placing the product, the core that has been contracted and supported by the core support pad is expanded to the regular size. Outfit)
Raise the left and right side plates to raise the front and back girders, and operate the tightening means protruding to the front girder side to tighten the whole formwork, place concrete from the upper space and close the upper lid to centrifuge the next process. Force forming (inserting the centrifugal force forming frame device into the rotating cylinder and rotating it to compact and mold the concrete) becomes possible. At the time of demolding, pull out the centrifugal force forming frame device from the rotating cylinder, open the upper lid by opening it, and operate the tightening means protruding toward the front end plate side in reverse to release the front and rear end plates and left and right side plates. When the core expansion / contraction mechanism is rotated in the reverse direction, the bell crank is pulled toward the center of the core, and the lower core moves upward (inside the upper core) while reducing the width, Also, the width is reduced by following the lower core, the core cross-section (width and height) is reduced, and the cavity of the product (hollow body block) and the core outer skin are peeled off to create a gap. If you lift it up slightly with a crane or demolding machine and pull it out forward, you can easily demold it while leaving the core supported by the core support grits on the mold. INDUSTRIAL APPLICABILITY The present invention can also be used as a mold for ordinary pouring and casting without centrifugal force molding.

At the time of demolding, the core is supported with a left-right clearance (gap) provided between the core support grates and the support frame, and the core support beam is also connected to the support arm so as to be swingable upward. Therefore, the core moves naturally in the direction of less contact resistance, which facilitates demolding and reduces the deformation and wear of the core, and the concrete fine powder and dust that has peeled off during demolding. There is an action to reduce the invasion into the inner core (because the lower core is submerged inside the upper core).

Further, according to the third aspect of the present invention, if the front and rear end plates are raised (closed), they can be directly placed on the centrifugal force forming device, so that there is no need to insert them into the rotary cylinder for centrifugal force forming, which saves labor. The manufacturing time can be further shortened.

[0010]

1 to 9 show an embodiment of the present invention. FIG. 1 is a front view showing a schematic structure of the present invention, and FIG.
3 is a partially cutaway side view showing a schematic configuration of the present invention, FIG.
5 is an explanatory view of a core and a core expansion / contraction mechanism according to a second embodiment of the present invention; FIG. 4 is a front view of the core expansion / contraction mechanism according to the first embodiment;
Is a plan view of the first embodiment of the core expansion / contraction mechanism, FIG. 6 is an operation explanatory view at the time of core reduction, FIG. 7 is a plan view of the second embodiment of the core expansion / contraction mechanism, and FIG. 9 is an explanatory view of an embodiment according to the present invention.
FIG. 3 is a perspective view showing an outline of a hollow body block.

In no particular order, a hollow body block is schematically shown with reference to FIG. 9. In this hollow body block BL, required rebars are assembled and inserted in a hollow portion bh, and concrete is filled into the construction / civil engineering block. Centrifugal force molding that is advantageous for compaction of concrete because it is a square tube-shaped thin-walled concrete product that is used as a discarding form for pillar-shaped structures, etc., because it increases the compaction density to increase the product strength and finish the surface beautifully. Is used.

The configuration and operation of each embodiment will be described below with reference to FIGS.

FIG. 1 is a front view showing a schematic structure of the present invention, in which a front end plate 50 and a rear end plate 60 (not shown) which are hinged to a base 10 are opened to open left and right side plates 70, 70 '.
And the upper lid 100 is opened and shown, and the core 80 is a core expansion / contraction mechanism 2
The figure shows a case where 00 is operated to widen the width to the normal state. A partially cutaway side view showing the schematic configuration of the present invention in FIG.
The expansion / contraction mechanism 200 and the core support beam 20 in which the front and rear end plates 50′60 are opened and the right side plate 70 ′ (front side) and the upper lid 80 are omitted and a part of the core 80 is broken and partly omitted are shown.

First, a schematic configuration will be described with reference to FIGS. 1 and 2, from the rear of a rectangular base 10 to an L-shaped bearing arm 1.
5 is extended, and the core support beam 20 is pivotally attached to the hinge portion 16 above the support arm 15 so as to be swingable only upward.
0 A front gable board 50 is hinged so that it can be tilted up and down, a core support beam 20 is penetrated through a rear part of the base, and a rear gable board is also hinged so that it can be tilted up and down. Is a hinge that can be opened and closed, and one end of the upper lid 100 is hinged to the upper part of the right side plate 70 ′ so that the core expansion / contraction mechanism 200 is internally installed. The upper core 81 having the portion 81J and the lower core 88 having the lower joining portion 88J are provided separately, and the flexible portions be are provided at the four corners of the core.
A support frame 85 suspended from the inside of the upper core 81 is provided at a substantially center of rotation of the core, and left and right clearances (gap) are provided in the support frame 85 so that the core support beam 20 is press-fitted. There is. In the figure, a base 10, both side plates 70, 70 ', and an upper lid 10
The chain line at 0 indicates the spacer / reinforcing rib KL (provided at a proper position in the longitudinal direction) when it is inserted into the rotary cylinder for centrifugal force molding.
Raise 0'and connect the front and rear gable plates 50, 60 to the chain double-dashed line 50 ',
After raising to the 60 'position and operating the rotating head 30 of the tightening means 33 to tighten the form, concrete is poured from the opening in the direction of arrow A, and the upper lid 100 is closed to perform the vibration compaction process. After that, insert into a rotating cylinder and rotate to perform centrifugal force molding. When removing the mold, the upper lid 100 and the side plates 70, 70 '
Open, the front and rear gable plates 50, 60 are opened, and the core expansion / contraction mechanism 20 is opened.
The core 80 is reduced by 0, and the hollow block BL is demolded in the arrow B direction while leaving the core on the mold.

FIG. 3 is an explanatory view of the core and the core expansion / contraction mechanism according to claim 2, and the others are omitted. The core 80 is an upper core 81 formed in a slightly shallow cross-section of a substantially U-shape. And a lower core 88 that is deeper than the upper core and has a substantially U-shaped cross section, and is divided into hollow core blocks B shown in FIG.
It is formed so as to have a substantially inner cross-sectional shape of the hollow portion BH of L, and the core outer skin portion, which is the shortest distance from the center of rotation of the core, is compacted by centrifugal compaction to reduce the volume, and the shortest distance from the center of rotation. In order to prevent an arcuate portion bulging outward from forming on the inner cross section of the portion, a concave portion 86 (concave shape may be any other arbitrary shape) for accommodating extra concrete in advance is provided.
Reinforcing ribs L1 are provided at different locations, avoiding the flexible parts be provided at the four corners of the core, and the mounting metal fitting 84 is hung from the inside of the upper core 81 to axially support the expansion / contraction mechanism 200. Then, a support frame 85 for fitting the core support slag 20 is fixed near the center of rotation of the core of the mounting bracket 84, and the left and right upper joints 8 of the upper core 81 are fixed.
An upper connecting fitting 82 is provided near the inner side of 1J, and the lower core 8
The lower connecting metal fitting 8 is provided near the inside of the left and right lower joints 88J of
9 is provided, and between the upper connecting fitting 82 and the lower connecting fitting 89,
The bell crank 180 is rotatably connected to the upper end connecting hole 182 of the bell crank 180 shown in the right side of the drawing, and the intermediate connecting hole 188 of the bell crank 180 is rotatably connected to the lower connecting fitting 89. The upper and lower cores 81 and 88 are connected to each other, and the tip connecting hole 190 of the bell crank is connected to the horizontal shaft portion 260b of the cross joint 260 (joint provided with an orthogonal connecting portion) which is the output end of the core expanding and contracting mechanism 200. By the widening operation of the expansion / contraction mechanism 200 (the rotating head 21
(0 is rotated right) The upper and lower joints 81J of the upper and lower cores 81, 88
88J is configured so that it can be sealed (becomes watertight at the time of contact). In the figure, p is a sharp positioning pin, which fits into the positioning holes of the front and rear end plates that contact the core end faces when the mold is assembled, and fixes the core that was moving during demolding to an appropriate position. .

On the upper part of the mounting metal fitting 84 which pivotally supports the expansion / contraction mechanism 200, a pivoting head 30 has a tip end which is pivotally supported by a fastening means 33 for tightly fitting the entire formwork through front and rear end plates. The left screw 33L and the right screw 3 are provided on the front and rear portions of the screw rod 33 provided on the
3R is threaded respectively, and a left screw nut 33N with a rectangular cross section
When the L and right screw nuts 33NR are provided by screwing respectively, and the front and rear end plates are closed and the turning head 30 at the tip of the screw rod is rotated to the right, the front and rear nuts 33NL and 33NR are shown as indicated by the lead lines.
Stand upright and approach each other in the direction of the arrow, and when they rotate in the opposite direction, they separate from each other, the front and rear nuts 33NL and 33NR become horizontal as shown in the drawing, and they dive through the rectangular insertion holes formed in the front and rear end plates 50 and 60. The gable plate is configured to be releasable. In addition, the limiting pin 34 protruding from the front and rear nuts 33NL and 33NR is 1 /
The four-circumferential limit groove 34C is constantly fitted to the front and rear nuts 33
The rotation range of NL and 33NR is limited to horizontal and vertical.

FIG. 4 is a front view of the first embodiment of the core expansion / contraction mechanism, and FIG. 5 is a plan view of the first embodiment of the core expansion / contraction mechanism. Referring to both figures, the core expansion / contraction mechanism 200 is shown. The core expansion / contraction mechanism 200, which describes in detail the configuration of FIG.
And a left screw portion 220L and a right screw portion 220R are threaded in series to form a screw shaft 220, and the link connecting shaft 2 is vertically provided.
The left ridge clevis portion 251 of the left side link connecting member 250a and the double clevis portion 252 of the right side link connecting member 250b, which are respectively provided with 55, are fitted with a slide nut NL of a left screw having a cylindrical outer surface to connect the left and right links. Member 250a,
250b is swingably connected, the slide nut NL is screwed into the left screw portion 220L of the screw shaft, and the right screw portion 220R.
In the same manner as described above, the single clevis portion 251 of the link connecting member 250a provided with the link connecting shafts 255 in the vertical direction, respectively.
And the double clevis portion 252 of the link connecting member 250b,
A slide nut NR having a right-hand screw having an outer cylindrical shape is fitted and the left and right link connecting members 250a and 250b are swingably connected to each other, and the slide nut NR is screwed into the right screw portion 220R to form the respective link connecting members 250a, One end of each link 240 is pivotally attached to the link connecting shaft 255 of 250b, the other ends of the links 240 are gathered, and the other end of the link 240 is pivotally attached to a vertical shaft 260a of a cross joint 260 provided with orthogonal connecting shafts. The horizontal shaft 260b of 260 is connected to the tip connecting hole 190 of the bell crank 180 indicated by the chain double-dashed line.
The core expansion / contraction mechanism 200, which constitutes the core expansion / contraction mechanism of the unit and is assembled by connecting a plurality of screw shaft 220 ends by a coupling 280, is rotatably supported on the bearing portion 84b of the mounting bracket 84. ing.

FIG. 6 is a diagram for explaining the operation when the core is reduced.
The operation of the core and the core expansion / contraction mechanism will be described below with reference to the drawings.

With the above-described structure, when the turning head 210 of the core expanding / contracting mechanism 200, which has been expanded to the normal state, is rotated counterclockwise, the left screw part 220L and the right screw part 220R of the screw shaft 220 are rotated.
The slide nut NL of the left screw and the slide nut NR of the right screw, which were screwed to and approached to each other, slid in the directions away from each other, and the cross joint 260 was moved through the link 240 pivotally attached to the slide nuts NL and NR. The horizontal shaft 260 of the cross joint 260 advances toward the center of the screw shaft.
Tip connection holes 1 of the left and right bell cranks 180 connected to b
90 is attracted, but because the bell crank 180 is bent and the lower core has a longer bending moment and the flexible portion be easily bent, the bell crank 180
The intermediate connecting hole 188 of the
When the screw shaft advances, the lower core 88 bends at the flexible part be to reduce the overall width and the upper part of the upper connecting hole 182 is rotated. When the upper end connecting hole 182 moves closer to the axial line of the tip connecting hole 190 that has moved to the upper inside of the core and moved with the screw shaft,
The upper end connecting hole 182 (which is connected to the upper connecting fitting 82) that has been stopped begins to be drawn, and is driven by the lower core 88 to bend the flexible portion be of the upper core 81 and the overall width is reduced. As shown in the figure, the height width of the entire core is reduced, which facilitates demolding. In the figure, the two-dot chain line shows the core size before reduction.

At the time of assembling the mold, if the rotating head 210 of the core expansion / contraction mechanism 200 that has been reduced is rotated clockwise, the screw shaft 22
The left screw slide nut NL and the right screw slide nut NR, which were screwed into the left screw part 220L and the right screw part 220R of 0 and separated from each other, slide toward each other and are pivotally attached to both the slide nuts NL and NR. The cross joint 260 advances in the direction opposite to the center of the screw shaft via the linked link 240, and urges the tip connection holes 190 of the left and right bell cranks 180 connected to the horizontal shaft 260b of the cross joint 260 outward. Bell crank 180 intermediate connection hole 188
If the lower core 88 connected to the lower part first descends and begins to widen, and then the upper core 81 also follows and the right rotation of the screw shaft progresses, the lower core 88 is lower than the upper joint 81J. The joint portion 88J abuts and closely contacts with a locus that draws an arc, and restores the core to the normal size shown in FIG.

Next, FIG. 7 is a plan view of the second embodiment of the core expanding / contracting mechanism, which is a screw shaft 220 provided with a rotating head 210.
The left screw portion 220L and the right screw portion 220R are threaded on the left side, and the left screw slide nut NL on the left side and the slide nut N on the right screw are provided with link connecting shafts 255 in the vertical direction.
L'is screwed into the left screw part 220L at a predetermined interval, and a left screw slide nut NR on the left side and a slide nut NR 'on the right screw on the right side, which are also respectively provided with link connecting shafts 255 in the vertical direction, are spaced at a predetermined interval. Screwed to the right screw part 220L,
Link 2 to the link connecting shaft 255 of each slide nut
40 is pivoted at one end and the other ends of the links 240 are pivotally attached to a vertical shaft 260a of a cross joint 260 provided with a connecting shaft orthogonal to each other, and a horizontal shaft 260b of the cross joint 260 is connected to the bell crank described above. 1 unit core expansion / contraction mechanism is connected to the tip connection hole 190 of 180,
A plurality of sets of screw shaft 220 ends are coupled by a coupling 280, and the assembled expansion / contraction mechanism 200 is mounted on the bearing portion 84 of the mounting bracket 84.
It is rotatably supported on b.

The operation of the core expansion / contraction mechanism of the second embodiment is performed by the rotating head 21 of the core expansion / contraction mechanism 200 which has been expanded to the normal state.
If 0 is rotated counterclockwise, the left and right left-screw slide nuts NL and NL 'and the right-screw slide nut N that are screwed into the left-hand screw portion 220L and the right-hand screw portion 220R of the screw shaft 220 and are approaching each other.
R and NR 'slide in directions away from each other, and the cross joint 260 advances toward the center of the screw axis through the link 240 pivotally attached to both slide nuts NL and NL' and NR and NR '. Horizontal axis 2 of joint 260
The tip connection holes 190 of the left and right bell cranks 180 connected to the 60b are drawn, but the bell crank 180 is bent, and the lower core has a longer bending moment and the flexible portion be easily bent. Bell crank 1 because it is easy
The intermediate connecting hole 188 of 80 starts to be attracted first with the upper end connecting hole 182 (to which the lower connecting fitting 89 of the lower core is connected) as the center of rotation, and if the rotation of the screw shaft advances, the lower middle As the flexible portion be bends and the overall width of the child 88 is reduced, the child 88 moves upward inward of the upper core and stays when the upper end connecting hole 182 approaches the axis line of the tip connecting hole 190 that has moved with the screw shaft. Upper end connecting hole 182 (upper connecting fitting 8
2) starts to be attracted, and the upper core 81 is driven by the lower core 88 to bend the flexible part be and the overall width is reduced, which is the same as the first embodiment described with reference to FIG. Do the same.

At the time of assembling the mold, if the rotating head 210 of the core expansion / contraction mechanism 200 that has been reduced is rotated clockwise, the screw shaft 22
The left screw slide nut NL and the right screw slide nut NR, which were screwed into the left screw part 220L and the right screw part 220R of 0 and separated from each other, slide toward each other and are pivotally attached to both the slide nuts NL and NR. The cross joint 260 advances in the direction opposite to the center of the screw shaft via the linked link 240, and urges the tip connection holes 190 of the left and right bell cranks 180 connected to the horizontal shaft 260b of the cross joint 260 outward. Bell crank 180 intermediate connection hole 188
If the lower core 88 connected to the lower part first descends and begins to widen, and then the upper core 81 also follows and the right rotation of the screw shaft progresses, the lower core 88 is lower than the upper joint 81J. The joint portion 88J abuts and closely contacts with a locus that draws an arc, and restores the core to the normal size shown in FIG. The same operation as in the case of the first embodiment described above is performed.

FIG. 8 is an explanatory view of an embodiment according to claim 3, in which the front and rear end plates 50, 6 provided on the base 10 to be openable and closable.
In the outer peripheral portion of 0, the front gable plate 50 hinged to the base 10 is provided so that it can be erected up and down to a substantially horizontal position, and the rear gable plate 60 is arranged so as not to hinder the release of both side plates.
It is attached to a hinge on the back and can be tilted several tens of degrees back and forth.
Both tires can be pivoted by closing 0,60.

According to the above construction, it is possible to omit the step of transporting the heavy centrifugal force forming frame device by a crane or the like and inserting it into the rotary cylinder, and it is possible to directly rotate the centrifugal force forming machine in a rotating manner. , Labor saving and manufacturing time can be shortened.

[0026]

When the present invention is applied to a hollow body block centrifugal force forming frame device, the core cross section is restored to the normal size by rotating the rotating head of the expansion / contraction mechanism to the right at the time of placing. When the head for rotation of the expansion / contraction mechanism is rotated counterclockwise during demolding, the lower joining member moves while shrinking upward inside the upper core, and the upper joining portion is also chased and displaced inward. The width and height of the core are reduced, and the core can be swung upwards and is supported with a clearance in the left and right directions, so the product can be raised several millimeters by vacuum pad (by vacuum suction) etc. By pulling it forward, the core will naturally move to a position with less frictional resistance while being supported by the support beam, allowing easy mold release and reducing damage such as abrasion and deformation of the core outer skin. Or, it can be prevented, and the inside of the core of concrete fine powder, dust, etc. Since the amount of insertion can be reduced, durability is improved, maintenance is less, the danger associated with core attachment / detachment can be prevented, labor saving and time reduction can be achieved, and demolding / placement work, which conventionally took 40 to 50 minutes, Since it can be done in 10 minutes, it has the effect of dramatically improving productivity. Since the core expansion / contraction mechanism operates by a simple turning operation, there is an effect that the introduction of an automatic machine becomes easy.

Further, according to the third aspect of the present invention, the step of transporting the heavy centrifugal force forming frame device by a crane or the like and inserting it into the rotary cylinder can be omitted, and the centrifugal force forming machine can be directly supported and rotated. It is possible to save labor, shorten the manufacturing time, and dramatically improve the production.

[0028]

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of the present invention.

FIG. 2 is a partially cutaway side view showing a schematic configuration of the present invention.

FIG. 3 is an explanatory diagram of a core and a core expansion / contraction mechanism according to a second embodiment of the present invention.

FIG. 4 is a front view of the first embodiment of the core expansion / contraction mechanism.

FIG. 5 is a plan view of the first embodiment of the core expansion / contraction mechanism.

FIG. 6 is a diagram for explaining the operation when the core is reduced.

FIG. 7 is a plan view of a second embodiment of the core expansion / contraction mechanism.

FIG. 8 is an explanatory diagram of an embodiment according to claim 3.

FIG. 9 is a perspective view showing the outline of a hollow body block.

[Explanation of symbols]

 Placing direction A Demolding direction B Flexible part be Left screw slide nut NL Right screw slide nut NR Base 10 Core support beam 20 Front gable plate 50 Rear gable plate 60 Core 80 Upper core 81 Upper joint 81J Upper part Connecting fitting 82 Support frame 85 Lower core 88 Lower joint 88J Lower connecting fitting 89 Bell crank 180 Upper end connecting hole 182 Intermediate connecting hole 188 Tip connecting hole 190 Core expansion / contraction mechanism 200 Screw shaft 220 Left screw part 220L Right screw part 220R Link 240 Cross joint 260 Tire 400

Claims (3)

[Claims] 1. A centrifugal force forming form device comprising a core having a bottom part provided with front and rear girder plates, left and right side plates, and an upper lid which are freely openable and closable, and a core having an expansion / contraction mechanism. The core is divided into an upper core and a lower core having joints that can be sealed when widened, and upper and lower joints are provided near the inside of each of the upper and lower joints, forming a substantially L-shape. The upper connecting hole of the bell crank is axially attached to the upper connecting portion, the intermediate connecting hole of the bell crank is axially attached to the lower connecting portion, and the tip connecting hole of the bell crank is expanded and contracted by turning the screw shaft to the left and right. Connected to the output end of the core expansion and contraction mechanism that converts into motion,
The screw shaft is axially supported by a mounting metal fitting hung on an upper core, a supporting frame is fixed near the center of rotation of the core of the mounting metal, and a shaft is swingable upward on a supporting arm extending from the rear part of the base. A mold device for centrifugal force molding, wherein the attached core support beam is inserted through the support frame with a left-right clearance. 2. The core expansion / contraction mechanism is configured such that a slide nut having a link connecting portion is screwed into a screw shaft having a plurality of screw portions having a rotating head and having different phases, and the slide nuts are screwed together. One end of the link is rotatably attached to the link connecting part of and the other end is gathered and rotatably connected to the vertical shaft part of the cross joint, and the connecting part orthogonal to the vertical shaft part of the cross joint is bell cranked. The mold device for centrifugal force molding according to claim 1, which is a core expansion / contraction mechanism connected to the distal end connection hole. 3. The front and rear gable plates provided on the base so as to be openable and closable,
The mold device for centrifugal force molding according to claim 2, wherein the front and rear end plates are provided with a tire that can be rotatably supported on the outer peripheral portion.