JPS5825567B2 - Manufacturing method and manufacturing machine for cement molded products having protrusions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cement molded product having a protrusion, particularly a cement roof tile with arabesque beads, and a manufacturing machine therefor.

In the production of cement mortar molded products, automatic mass production was difficult because there was a problem with mold release when taking the molded product out of the mold in a molded state that had been compressed and squeezed before curing.

In particular, when cement mortar molded products that have a part that protrudes from the main body, such as arabesque beaded cement tiles, are compression molded using only the upper and lower molds, the protruding part will shift (displace) when the mold is released. Full automation was not possible due to residual adhesion of material.

The reason for this is thought to be that the four parts of the mold that form the protrusion are so small that the compressive force from the main press is not transmitted to these parts to the same extent as the product body, and at the same time this part is difficult to release from the mold.

Therefore, conventionally, a rough space larger than this protrusion was provided in the upper and lower molds, and a mold corresponding to the protrusion made of an iron plate was inserted into this space for each molding of one product. When the product was taken out, it remained attached to the product.

However, the quality of this product is also poor because the material of this protrusion does not receive the same compressive force as the main body.

Further, if the protrusion is removed before the upper and lower molds are separated, the entire mold can be released more smoothly.

However, such a structure that moves part of the mold surface must be able to withstand the pressure of a high-pressure press.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method and a manufacturing machine for manufacturing a cement molded product having a protruding portion that can withstand the operation of a high-pressure press, while maintaining uniformly good quality throughout the product and ensuring release from the mold. be.

In order to achieve the above object, the present invention first makes the wall defining the end face of the protrusion of a cement molded product having a protrusion movable in a direction perpendicular to the compression direction of the main press, and the movable wall moves between the final molding position and the final molding position. The main press is movable to and from a preforming position slightly outward from the final forming position, at which the main press is depressurized for a short period of time after completing preform compression and retreats a short distance. , the movable wall is moved from the preforming position to the final molding position in synchronization with that time, and the molding of the product is completed by final molding compression of the main press. The purpose is to provide a method.

While compression is being performed by the main press, it is impossible to apply a compressive force to the end face of the protrusion in a direction perpendicular to this.

Therefore, after preliminary forming, it is necessary to stop the operation of the green press, release the pressure, and retreat slightly upwards, and in this state, move the movable wall against the end face of the protrusion from the preliminary forming position to the final forming position while compressing the material. .

The reason for providing a temporary molding position is that it is difficult to uniformly distribute the material within the mold due to the compressive force of the main press, so a space larger than the space for final molding is created because it is difficult for the concave part to mold the protrusion. By pushing the material back to the final forming position, an even distribution of material is achieved and the final forming allows for homogeneous compaction.

Such molding also requires construction such that the moving walls are held in position against the high pressure main press compression forces during final molding.

In the embodiment of the present invention, the air cylinder that operates the movable wall is connected to the movable wall by a link mechanism, and when the movable wall is in the final molding position, the compressive force of the main press is applied to the link mechanism by the arrangement of the link mechanism. This can be solved by ensuring that the pressure is not applied to the air cylinder by the supporting mold, and that the pressing force of the main press is not applied to the air cylinder.

The present invention also provides a recess for molding a protrusion of a molded product, which is bored laterally from the main recess of one or both of the upper mold and the lower mold, and a recess that is reciprocally slidable in the recess. a movable wall provided therein; a device for reciprocating the movable wall between a molding position and a retracted position within the recess; a connecting link which is pivotally connected to the support rod of the wall body and the link means at both ends, and an air cylinder for reciprocating the support rod, the two links being connected in series by the link means; one end of an air cylinder is connected to one end of the air cylinder, the link means is arranged parallel to and in line with the support rod when the wall body is in the molding position, and when the air cylinder is actuated, the above-mentioned It is an object of the present invention to provide a manufacturing machine for a cement molded product having a protrusion, characterized in that the link means is angularly displaced to form an angular shape, and the wall is set back from the molding position.

With the above structure, when the wall corresponding to the end face of the protruding part is separated from the product after molding, the air cylinder is operated to ensure mold release at an initial low speed and gradually high speed. The compressive force of the high-pressure press can be received by the mold itself via a link mechanism, and this compressive force can be prevented from being applied to the air cylinder.

In the following, the features of the invention will be explained in more detail with reference to the drawings, which show one embodiment of an apparatus for carrying out the invention.

According to FIGS. 1 to 3, the mold structure of the cement molded product manufacturing machine of the present invention, particularly the arabesque beaded tile manufacturing machine, includes an upper mold 1 that can be freely attached to the lower end of the high-pressure press, and an old base of the lower mold. 2 and a formwork 3 that is movable up and down around the substrate 2, and a columnar recess of an appropriate cross-sectional shape is provided horizontally in the formwork 3 so as to form the side surface of the protrusion. A movable wall A for forming the end face of the protrusion, which is provided to reciprocally slide.
has.

As is clear from Fig. 1, the walls forming this columnar recess are mainly provided at the upper part in the upper mold 1 and at the lower part in the formwork 3, and the molded product is sucked into the upper mold and separated from the mold. In order to do this, it may be necessary to move the part indicated by B after molding.

Therefore, in such a case, this portion is used as an auxiliary wall B and is provided so that it can be retreated in the horizontal direction before lowering the formwork 3 after molding.

Of course, it is also conceivable to provide a portion corresponding to this auxiliary wall B on the upper mold.

For example, if the cross section of the protrusion is square or rectangular with horizontal and vertical sides, there is no need to use the auxiliary wall B as a separate member.

In the illustrated example, the protrusions stand up from the base of the molded tile, but by turning this upside down, the shape of the upper and lower inner surfaces of the mold is changed so that the protrusions, like arabesque beads, hang down from the base. It is also possible to select.

It is also possible to provide a moving aA for forming arabesque beads or other protrusions on the upper mold.

4 to 9 show a drive mechanism for the cylindrical moving wall A and the auxiliary wall B that form the end surface of the arabesque bead.

The movable wall A does not have to be cylindrical, and a cement molded product having a prismatic protrusion can be manufactured.

A rod is fixed to the back of the moving wall A, and this rod is attached to the formwork 3.
It penetrates the wall and protrudes outward, is rotatably supported by the block 4, and further extends to form a rotary arm 14 at the end.
is fixed to one end of the

The block 4 is rotatably connected around a vertical axis at one end of a link 5, and the link 5 is linked to a mounting part 13 provided at the left end of the formwork 3 (in FIGS. 1 to 3) at the middle. They are pivotally connected via 12.

The other end of the link 5 is pivotally connected to one of the three ends of the T-shaped link 7 via a link 6, and one of the other two ends of the T-shaped link is connected to the formwork 3. The third end (base end of the T-shape) is pivotally connected to a rod of a piston that is reciprocated within the air cylinder 9. Can be freely connected.

The air cylinder 9 is pivotally mounted in the middle of a link 11 whose one end is pivotally attached to a mounting portion 25 protruding from the right side of the mounting portion 8 on the front surface of the formwork 3.

The other end of the link 11 is pivotally connected to the piston rod end of the auxiliary air cylinder 10, and the other end of the auxiliary air cylinder 10 is pivotally connected to an arm fixed to the air cylinder 9.

As for the rotating arm 14, a block 24 is pivotally attached to a mounting portion protruding from the rear of the left end wall of the formwork 3 so as to rotate around a vertical axis, and the block 24 is rotatable around a horizontal axis. One end of the air cylinder 22 is pivotally connected to the
The other end of the rotating arm 14 is pivotally connected to the free end of the piston rod that protrudes from the other end of the air cylinder 22 .

The operating mechanism of the auxiliary wall B is similar to that of the cylindrical movable wall A, and is attached to the formwork 3 using a simpler mechanism.

That is, an operating rod is fixed to the auxiliary wall B that protrudes from the end face thereof and extends parallel to the operating rod of the cylindrical moving wall A.
A block provided at the other end of the actuating rod is pivotally connected to one end of the link 19 so as to rotate about a vertical axis, and the link 19
The middle part of the link 19 is connected to a mounting part 21 protruding from the left end wall of the formwork 3 via a link 20 which is pivoted at both ends, and the other end of the link 19 is connected to a link 15, and the other end of the link 15 and the formwork A triangular mounting portion 17 protruding from the rear wall and a piston rod end protruding from an air cylinder 18 are connected at three points by a T-shaped link 16, and the other end of the air cylinder 18 is attached to the rear wall of the formwork 3. It is pivotally attached to a mounting portion 23 that protrudes from another location.

Regarding the above-mentioned mechanism, first, the operation of the moving wall A will be explained. In FIG. 4, it is in the temporary forming position.

At this time, the air cylinder 9 that moves the movable wall A between the temporary forming position and the retreated position is in the position where the piston rod has been pushed out, and the auxiliary air cylinder 10 that moves the movable wall A to the final forming position is also in the position where the piston rod is pushed out. It is in the position where it is pushed out.

When the auxiliary air cylinder 10 is actuated to draw the piston rod into the cylinder, the state shown in FIG. 5 is achieved, and the movable wall A is pressed to the final molding position.

The main press piston that holds the upper mold of the cement molded product manufacturing machine is temporarily depressurized when preliminary molding is completed, and by synchronizing the movement of slightly lifting the upper mold, the movement uA is pressed to the final molding position. It becomes easier.

At this point, the horizontal bar part of the T-shaped link and the link 6 are in line, so the high pressure of the press that performs the final forming on the moving wall A is stopped by the attachment part 8 of the formwork 3, and has no effect on the air cylinder. It is designed so that it does not affect the

Similarly, the final molding pressure applied to the auxiliary wall B is stopped by the mounting portion 17 because the links 16 and 15 are aligned by the same mechanism.

When the final molding compression is completed, the air cylinder 18 is operated as shown in Fig. 6, and when the piston rod is retracted, the link 1
6°15 is bent, and the auxiliary wall B retreats and separates from the molded product.

Next, as shown in FIG. 7, when the air cylinders 10 and 22 operate synchronously and retract their respective piston rods, the movable wall A retreats to the temporary forming position and a part of the molded product is removed from the end face of the protrusion. This can be released from the mold without peeling.

If the protrusion is cylindrical, it causes the rotary arm 14 to rotate synchronously.

The same can be said about the air cylinders 18 and 19, but since the air cylinders 22 and 10 actuate the rod of the moving wall A via a link mechanism, they can give it an initial low-speed gradual acceleration motion. , to ensure that molded products are kept clean.

When the air cylinder 9 operates from the state shown in FIG. 7 to the state shown in FIG. 8 and retracts the piston rod, the movable wall A further retreats.

If the end surface of the protrusion is flat, this step can be skipped.

Next, when the formwork 3 is lowered by the hydraulic cylinder,
The side wall of the cement molded product is exposed, and when the upper mold 1 is raised while applying suction force, the molded product is released from the substrate 2 of the lower mold and can be easily moved onto the receiving plate. can.

In the illustrated embodiment, the reciprocating movement of the movable wall A is performed in two stages, but this is because when the arabesque pressing end surface has a spherical convex surface, the thickness of this convex surface is greater than the distance between the preliminary forming position and the final forming position. Required if large.

In this case, if the movable wall A is not retreated from the temporary molding position, the convex end surface of the protrusion of the molded product lifted by the upper die will be scraped off by the periphery of the movable wall A.

If the shape of the end face of this protrusion is flat or the thickness is equal to or less than the distance between the temporary molding position and the final molding position, the same structure as the operating mechanism of the auxiliary wall B, which has a simpler structure, may be used.

Although an air cylinder was used as the drive device, operation by a hydraulic drive device is also possible.

[Brief explanation of the drawing]

Figure 1 shows the upper and lower molds of the device used in the method of the present invention.
2 is a sectional view taken along the line I--I in FIG. 1, FIG. 3 is a sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a sectional view taken along the line ■--■ in FIG. 4 to 8 are schematic perspective views showing the operating mechanism of the cylindrical wall body, respectively. FIG. 4 is the temporary forming position, FIG. 5 is the final forming position, and FIG. 6 is the auxiliary wall retracted position. The figure shows the position where the cylindrical wall has been retreated to the temporary forming position, and FIG. 8 shows the position where the cylindrical wall has been further retreated and the product can be picked up by the lower die. FIG. 9 is a plan view showing the attachment of the cylindrical wall body and the auxiliary wall to the lower die of the operating mechanism, and shows the final molding position. 1...Top mold, 2-...Bottom board, 3.
... lower formwork, A ... cylindrical wall, B
...Auxiliary wall, 9゜10.18,22...-
Air cylinder, 14...Rotating arm.

Claims (1)

[Scope of Claims] 1. A wall defining an end face of a protruding part of a cement molded product having a protruding part is movable in a direction perpendicular to the compression direction of the main press, and the movable wall can move between the final molding position and the final molding position. allowing movement between the preforming position and the slightly more outwardly located preforming position;
After the main press completes the preform compression at the preforming position, it is depressurized for a short period of time and retreats a small distance, and in synchronization with this time, the moving wall is moved from the preforming position to the final forming position. , a method for producing a cement molded article with protrusions, characterized in that the shaping of the product is completed by final shaping compression of the main press. 2. A recess for molding the protruding part of the molded product, which is bored laterally from the main recess of one or both of the upper mold, the lower mold, and a movable part provided to reciprocate in the recess. a wall, and a device for reciprocating the movable wall between a molding position and a retracted position within the recess, the wall reciprocating device including a link means pivotally connected to the mold; The connecting link is pivotally connected to the support rod of the wall body and the link means at both ends, and the air cylinder for reciprocating the support rod, and the link means is composed of two links connected in series, one of which one end of an air cylinder is connected to the air cylinder, and when the wall body is in the molding position, the link means is arranged parallel to and in line with the support rod, and when the air cylinder is actuated, the link means is angularly displaced. 1. A machine for producing a cement molded product having a protrusion, characterized in that the wall has an angular shape and is set back from a molding position.