JP3542882B2 - Extrusion equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an extruder, and more particularly to an extruder of a molding machine that is effective for forming a piece of dough having a predetermined shape and size.
[0002]
[Prior art and its problems]
There are various types of extrusion devices of a molding machine. For example, a type as shown in FIG. 6 is generally known.
[0003]
That is, the extruder 51 includes a cylindrical tube 52, a disk-shaped base 53 for closing the lower end opening of the tube 52, and a heating plate 60 provided in close contact with the outer peripheral side of the tube 52. A cylindrical cavity (hereinafter, referred to as a pot 57) for accommodating a molding material is formed in a portion inside the tube 52, the piston 61 being provided so as to be able to protrude and retract in the tube 52; A gate 56 is formed at the center of the base 53 to serve as a passage for extruding the molding material from inside the pot 57.
[0004]
Then, when a molding material such as oil-containing rubber (NBR, silicon, etc.) is stored in the pot 57 and the heating plate 60 is operated, the tube 52 in close contact with the heating plate 60 is heated over the entire circumference. Then, the heat of the tube 52 is transmitted to the forming material in the pot 57, and the forming material is gradually heated from the outer peripheral side toward the center, and gradually becomes softer from the outer peripheral side toward the center.
[0005]
Then, when the piston 61 is immersed in the tube 52, the molding material kept in a moderate softness in the pot 57 is pressed and extruded out of the pot 57 through the gate 56, and according to the shape of the gate 56. Formed into the dough. The dough formed in this way is supplied to the molding die of a molding die insertion / removal device via a cutting device (not shown), a conveying device, or the like, and is formed into a molded product conforming to the shape of the molding die. It is.
[0006]
However, in the conventional extruder 51 configured as described above, the temperature distribution of the molded material heated in the pot 57 varies (the temperature of the outer peripheral portion near the tube 52 is high, and the temperature is far from the tube 52). (The temperature at the center is low), and the gate 56 is located at a portion corresponding to the central portion having a low temperature. Will be pushed out through the gate 56 first. For this reason, the extruded dispensed dough is deformed into a wavy shape by resistance or the like when passing through the gate 56, causing variations in shape and dimensions, and adversely affecting the next process.
[0007]
Further, after the extrusion, a sink occurs in the molded material in the pot 57 due to an internal stress (a movement of the material which is once compressed and tends to return to the original state immediately after the compression is stopped; hereinafter, referred to as an internal stress), and the sink causes the material to be dispensed. A part of the dough is sucked into the pot 57, and a so-called ear cut occurs at a portion corresponding to the gate 56. For example, when this weak edge part is dropped during the next extrusion, while it is attached to the tip of the dough once, it causes variations in dimensions and adversely affects the next process. (See FIG. 7).
[0008]
The present invention has solved the above-mentioned problems of the conventional art, and even if the temperature distribution of the molded dough stored in the pot varies, the shape and size of the dispensing dough will vary. There is no such problem, and the dispensing dough is not sucked into the pot due to the internal stress of the molding dough in the pot, and always forms the dispensing dough of a predetermined shape and size according to the gate. It is an object of the present invention to provide an extruder capable of performing the following.
[0009]
[Means for solving the problem]
In order to solve the above-mentioned problems, the present invention provides a pot having a gate in the center of the bottom surface, a piston provided to be able to protrude and retract in the pot, and provided outside the pot. together, the extrusion apparatus example Bei and heating means capable of heating the molding material housed in the said pot, a breaker plate is provided in said pot, with partitioning into two chambers the pot axially, the breaker only the outer portion of the axis of the gate of the peripheral portion of the plate is obtained by employing a means provided with at least one inlet hole communicated with each other between the two chambers therethrough in the axial direction .
[0010]
[Action]
According to the present invention, by adopting the above-described means, when the molding dough is stored in the pot and the pot is heated by the heating means, the molding dough in the pot gradually moves from the portion near the heating means toward the center. Heated. Then, when the piston is immersed in the pot and presses the molding dough, the molding dough flows from the portion near the inflow hole of the breaker plate into the chamber on the gate side through the inflow hole, and is extruded from there through the gate. , Is formed into a piece of dough having a predetermined shape and size.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
FIG. 1 shows an embodiment of an extrusion apparatus according to the present invention. The extrusion apparatus 1 shown in this embodiment includes a tube 2, a base 3 attached to a lower end opening of the tube 2, and a tube 3. 2, a breaker plate 14 provided in the tube 2, a heating plate 10 as heating means provided on the outer peripheral side of the tube 2, and a piston 11 provided to be able to protrude and retract in the tube 2.
[0012]
The tube 2 has a cylindrical shape, and a pot 7 for storing a molding material such as oil-impregnated rubber (NBR, silicon, or the like) is formed inside the tube 2.
[0013]
The base 3 is formed in a disk shape, and a concave portion 4 having an inner diameter substantially equal to the inner diameter of the tube 2 is drilled at a predetermined depth on the upper surface thereof. A step 5 having an inner diameter substantially equal to the outer diameter of the tube 2 is formed at a predetermined depth over the entire circumference. By fitting the lower end of the tube 2 into the step 5, a tubular pot 7 having a closed lower end is formed inside the tube 2.
[0014]
A through hole 6 having a predetermined shape (in this embodiment, an elliptical shape) penetrating the base 3 in the axial direction is formed in a central portion of the base 3, and a pot corresponding to the through hole 6 is formed in a pot. A gate 6 for extruding the molded dough stored in 7 out of the pot 7 is formed.
[0015]
On the outer peripheral side of the tube 2, a tubular heating plate 10 is provided in close contact with the tube 2. By operating the heating plate 10, the tube 2 can be heated over the entire circumference and the tube 2 can be heated. The heat can be transmitted to the molding dough stored in the pot 7.
[0016]
Above the tube 2, a piston 11 is provided so as to be able to move up and down with the axes thereof aligned. The piston 11 is integrally connected to a pressure cylinder 12 to be described later via a rod 13, and can be moved up and down by the operation of the pressure cylinder 12, and is slid into the tube 2 when descended. It is possible.
[0017]
A breaker plate 14 is provided in the tube 2, and the inside of the pot 7 inside the tube 2 is vertically partitioned into two chambers of an upper chamber 8 and a lower chamber 9 by the breaker plate 14.
[0018]
The breaker plate 14 has a cylindrical shape with an upper end closed, and has a flange 15 provided at the lower end and projecting radially outward in a ring shape, and a lower end of the tube 2 and a step 5 of the base 3. To be sandwiched between the bottom surface of the base. At least one location near the tube 2 (only the portion outside the axis of the gate 6) at the peripheral edge of the breaker plate 14 is provided with an inflow hole 16 vertically penetrating therethrough. The upper chamber 8 and the lower chamber 9 in the pot 7 communicate with each other via the intermediary.
[0019]
As shown in FIG. 2, inflow holes 16 penetrating between the upper and lower surfaces of the breaker plate 14 may be provided at a plurality of locations on two concentric circles, and in this case, the inner inflow holes 16 may be provided. Is made smaller than the hole diameter of the outer inflow hole 16 to provide a difference in the amount of the dough flowing between the outside and the inside, so that the swelling of the dough at the center can be prevented. As shown in FIG. 3, a concave portion 17 is provided on the upper surface of the breaker plate 14 and a concave portion 18 is also provided on the lower surface, so that an inflow hole communicating between the concave portions 17 and 18 is provided at a peripheral portion of the concave portions 17 and 18. 16 may be provided evenly.
[0020]
Next, a description will be given of a molding machine incorporating the extrusion apparatus 1 of the present embodiment configured as described above.
[0021]
FIGS. 4 and 5 show a molding machine 40 incorporating the extrusion apparatus 1 according to this embodiment. FIG. 4 is a side view showing the whole, and FIG. 5 is a front view of what is shown in FIG.
[0022]
That is, the molding machine 40 is configured to extrude a molding dough to form an extruded dough having a predetermined shape and size into an extruded dough according to this embodiment. And a transport device 35 for supplying the divided dough cut by the cutting device 25 into the molding die of the molding die loading / unloading device 39.
[0023]
As described above, the extrusion device 1 includes the tube 2, the base 3, the heating plate 10, the breaker plate 14, and the piston 11. And a replenishing device 20 for replenishing the pot 7 with molding dough is provided between the pressure cylinder 12 and the tube 2.
[0024]
A moving cylinder 22 is connected to the cylindrical portion 21 of the replenishing section device 20, and the cylinder 21 can be advanced and retracted in a direction orthogonal to the operating direction of the piston 11 by the operation of the moving cylinder 22.
[0025]
The cutting device 25 has a cutting member 26 having a cutting blade 27 for cutting the extruded dough extruded from the extruder 1, and supports the cutting member 26 so as to be able to advance and retreat in a direction orthogonal to the extruding direction of the extruded dough. It comprises a guide rail 28 and a moving cylinder 29 for moving the cutting member 26 forward and backward.
[0026]
A bearing 31 is attached to the cutting member 26 via a shaft 30, and the bearing 31 is capable of rolling in a groove 32 provided on the inner surface of each guide rail 28. The cutting member 26 is integrally connected to the moving cylinder 29 via a connecting member 33. By operating the moving cylinder 29, the cutting member 26 can advance and retreat along the shape of the groove 32 of the guide rail 28 via the shaft 30 and the bearing 31.
[0027]
The vicinity of the center of one of the grooves 32 of the guide rail 28 is slightly inclined. Therefore, when the cutting member 26 advances and retreats along the shape of the groove 32, the cutting member 26 rotates about the one shaft 30 as a fulcrum. At the position A in the drawing, the cutting blade 27 of the cutting member 26 moves in the traveling direction. On the other hand, in the position B shown in the figure, by turning about one shaft 30 as a fulcrum, the cutting blade 27 faces upward at the same angle, that is, upward. is there.
[0028]
The cutting member 26 cuts the extruded dough extruded from the extruder 1 in a state where the cutting blade 27 is inclined at about 45 ° with respect to the traveling direction, and after the cutting, the groove 32 of the guide rail 28 is cut. Revolves along the shape of (1), rotates about one shaft 30 as a fulcrum, and holds the dispensed cloth inside the cutting blade 27 with the cutting blade 27 facing upward at the position B in the figure. It is.
[0029]
The transporting device 35 includes an adsorbing member 36 that adsorbs the dough cut by the cutting device 25, a horizontal moving cylinder 37 that moves the adsorbing member 36 in the horizontal direction, and a vertical movement that moves the adsorbing member 36 in the vertical direction. And the use cylinder 38. The suction member 36 is connected to a vacuum pump or a vacuum generator (not shown), and operates so as to vacuum suction the dispensed dough.
[0030]
Next, the operation of the molding machine 40 configured as described above will be described.
First, the molding dough is stored in the upper chamber 8 of the pot 7 of the extruder 1, and the heating plate 10 is operated to heat the tube 2. The heat of the tube 2 is transmitted to the molding dough in the upper chamber 8, Is gradually heated from the outer peripheral portion near the tube 2 toward the central portion.
[0031]
Then, when the pressure cylinder 12 is operated to lower the piston 11 to be immersed in the upper chamber 8 of the pot 7, the molding material in the upper chamber 8 is pressed and located near the inflow hole 16 of the breaker plate 14. The material flows into the lower chamber 9 through the inflow hole 16 and is pushed out of the lower chamber 9 through the gate 6 to the outside of the pot 7 to form a divided dough having a predetermined shape and size according to the shape of the gate 6. Will be done.
[0032]
In this case, since the inflow hole 16 of the breaker plate 14 is provided at a portion near the inner peripheral surface of the tube 2, the molding material flowing first from the upper chamber 8 into the lower chamber 9 is located near the tube 2. It is a part with high softness and high fluidity. Therefore, the extruded dough after extrusion is not deformed by the resistance when passing through the gate 6, and the extruded dough having a predetermined shape and size can be formed. Also, even if an internal stress is generated in the molding dough remaining in the pot 7 after the extrusion, the internal stress is received by the breaker plate 14 provided in the pot 7, so that the divided dough is removed from the pot 7. So that there is no so-called ear break at the portion corresponding to the gate 6.
[0033]
Then, the cutting member 26 is moved by operating the moving cylinder 29 of the cutting device 25, and the extruded dough extruded from the extruder 1 is cut by the cutting blade 27 of the cutting member 26. Is moved while being rotated about the axis 30 as a fulcrum, and is positioned at the position B in the figure. The cutting blade 27 is directed upward in the figure and the dough is held inside the cutting blade 27.
[0034]
Next, the vertical movement cylinder 38 and the horizontal movement cylinder 37 of the transport device 35 are operated to bring the suction surface of the suction member 36 into contact with the upper surface of the dough positioned inside the cutting blade 27 of the cutting member 26. At the same time, a vacuum pump or a vacuum generator (not shown) is operated to vacuum-suck the dispensed dough, and then the horizontal moving cylinder 37 and the vertical moving cylinder 38 are operated to move the adsorbing member 36, thereby dispensing the dispensed dough. Is supplied into the molding die of the molding die insertion / removal device 39 to form a molded product having a desired shape in the molding die.
[0035]
In the extruding apparatus 1 according to this embodiment configured as described above, the breaker plate 14 is provided in the tube 2 so that the inside of the pot 7 formed inside the tube 2 is divided into the upper chamber 8 and the lower chamber 9. Since the inflow hole 16 communicating between the upper and lower chambers 8 and 9 is formed in a portion of the breaker plate 14 close to the inner peripheral surface of the tube 2, the molding dough accommodated in the pot 7 is formed. Will flow from the high temperature soft part into the lower chamber 9 from the upper chamber 8 through the inflow hole 16 of the breaker plate 14. Then, the molding material in the vicinity of the central portion where the temperature is low flows toward the inner peripheral surface of the tube 2 and is heated, and finally moves into the lower chamber 9 through the inflow hole 16 of the breaker plate 14. Therefore, in the lower chamber 9, a soft molding material having a high temperature is always located, so that the dispensed dough extruded from the lower chamber 9 through the gate 6 has a low temperature, so that the shape and dimensions are reduced. Variation does not occur, and it is possible to always form a divided dough having a predetermined shape and size.
[0036]
A breaker plate 14 is located in the pot 7, and can receive internal stress generated in the molding dough in the pot 7 after being extruded by the breaker plate 14. Nothing is sucked into the chamber 9. Therefore, a so-called cut-off does not occur at a portion corresponding to the gate 6, and a variation in dimensions due to the dropping of the dispensed dough from the cut-off portion does not occur. Accordingly, the process after the extrusion molding is not adversely affected, and the molded product having a desired shape can be formed by the molding die of the molding die insertion / removal device 39.
[0037]
【The invention's effect】
The present invention is configured as described above, a breaker plate is provided in the pot, and the inside of the pot is partitioned into two chambers in the axial direction, and only the portion of the peripheral edge of the breaker plate outside the axis of the gate is provided. By providing at least one inflow hole penetrating therethrough in the axial direction and communicating the two chambers with each other, the molding dough stored in the chamber above the breaker plate in the pot has a peripheral portion close to the heating means. From the high temperature soft part , flows into the lower chamber of the breaker plate through the inflow hole at the periphery of the breaker plate, and is pushed out of the pot through the gate at the center of the bottom of the lower chamber. .
Then, in the upper chamber of the breaker plate, the hard part having a lower temperature at the central portion far from the heating means of the forming dough moves in the direction of the heating means, and the temperature is increased by being heated by the heating means, so that the softness increases. The softened molding material flows into the lower chamber of the breaker plate through the inflow hole at the peripheral edge of the breaker plate, and is pushed out of the pot through the gate at the center of the bottom surface of the lower chamber. .
Therefore, since the soft molding material having a high temperature is always located in the lower chamber of the breaker plate, the resistance when the molding material passes through the gate can be reduced. As a result, the extruded dough is not deformed in a wave shape, and the shape and dimensions do not vary, and a dispensed dough having a predetermined shape and size can be obtained .
Further, since the internal stress generated in the molding dough in the pot after the extrusion is received by the breaker plate located in the pot, sinking occurs in the molding dough due to the internal stress of the molding dough. The dough will not be sucked into the pot. Therefore, since the portion corresponding to the gate never as called ear breakage occurs, the coming off Thus the dimension from the ear Broken portions of minute out dough variations occur such that not a predetermined shape, dimensions The dispensed dough can be reliably formed.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of an extrusion apparatus according to the present invention.
FIG. 2 is a sectional view showing another example of the breaker plate shown in FIG.
FIG. 3 is a sectional view showing another example of the breaker plate shown in FIG.
FIG. 4 is a side view (partial cross section) showing an example of a molding machine incorporating the extrusion device shown in FIG.
FIG. 5 is a front view of what is shown in FIG.
FIG. 6 is a cross-sectional view showing an example of a conventional extruder, and is a cross-sectional view showing a state in which the dispensing dough is deformed.
FIG. 7 is a cross-sectional view showing an example of a conventional extruder, and is a cross-sectional view showing a state in which ear cuts are attached to a dispensing dough.
[Explanation of symbols]
1, 51 Extrusion device 2, 52 Tube 3, 53 Tubes 4, 17, 18 Recess 5 Step 6, 56 Gate 7, 57 Pot 8 Upper chamber 9 ... Lower chambers 10 and 60 Heating boards 11 and 61 Pistons 12 Pressurizing cylinders 13 Rods 14 Breaker plates 15 Flanges 16 Inlet holes 20 Replenishing devices 21 Cylindrical portions 22, 29 Moving cylinder 25 Cutting device 26 Cutting member 27 Cutting blade 28 Guide rail 30 Shaft 31 Bearing 32 Groove 33 Connecting member 35 Conveying device 36 Adsorbing member 37 Horizontal moving cylinder 38 Vertical moving cylinder 39 Mold moving device 40 Molding machine

Claims (1)

A pot having a gate in the center of the bottom surface capable of storing the molding dough, a piston provided to be able to protrude and retract in the pot, and a molding dough provided outside the pot and accommodated in the pot is heated. in the extrusion apparatus example Bei and heating means for obtaining, by providing a breaker plate into the pot, as well as divided into two chambers of the inner pot axially outer than the axis of the gate of the periphery of the breaker plate only the portion, extrusion apparatus characterized by comprising at least one inlet hole communicated with each other between the two chambers therethrough in the axial direction.

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