JPH03173627A - Rubber extrusion head - Google Patents

Abstract

PURPOSE:To perform the opening and closing of an upper head and a lower head and the clamping of both heads to a fixed head only by a single mechanism and to simplify a structure and operation by operating the upper and lower heads arranged above and below the fixing head by a fastening means consisting of the crank member and two connection levers pivotally supported by the fixing head. CONSTITUTION:A clamping means 5 has the crank member 21 pivotally supported by a fixing head 2 and two connection levers 22, 23 respectively connecting upper and lower heads 23, 4 to the fixing head in the vicinity of the dead point of the crank member in such a state that the upper and lower heads are in close contact with the fixing head and, therefore, the upper and lower heads can be pressed to the fixing head by the large tensile or compression force generated in the vicinity of a fulcrum to be brought into close contact therewith. Therefore, the upper and lower heads are fastened in the fixing head in continuation to the opening and closing operation thereof and pressed to the fixing head by the fastening force generated in the vicinity of the dead point and, as a result, even when rubber is injected from a nozzle passage, the close contact state of the upper and lower heads and the fixing head is held and rubber can be certainly and accurately injected.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a rubber extrusion head that is molded backwards with a nozzle passage in between, and the opening and closing of the molds and the crimping of the molds to each other are performed using a single crank mechanism. The present invention relates to a rubber extrusion head that has a simple structure and can strongly bring molds into close contact with each other by forming the head using a pressing means.

[Conventional technology]

1. In rubber extrusion 7, which injects the rubber sent from the extruder towards the outside of the machine, the cross-sectional shape of the injected rubber is diverse, and it tends to emit at the time of injection. A split mold that is divided along the nozzle passage is often used to easily deal with nozzle clogging.

Also, in order to extrude two types of rubber at the same time, move the Q-nozzle up and down.
LJ may be installed on the tier.

[Problem to be solved by the invention]

Such a split type extrusion head has conventionally been disclosed in Japanese Patent Publication No. 54-43549, and as shown in FIG. The upper head b and lower head C are opened and closed by opening/closing cylinders lpl and pl, respectively, while the upper head b and lower head C are tightened by wedge fittings d and d that sandwich the upper throat b and the lower head C from the sides. This was done by a wedge action in which cylinders p2 and p2 were used to press the cylinders p2 and p2.

In this way, conventional opening/closing operations that require a large stroke and tightening operations that require a strong pressing force are:
The structure of the device is complicated because different mechanisms are used for each purpose.

However, in the case of an extrusion head equipped with two nozzles, when the two movable types provided above and below δ are operated in approximately synchronized rotation and tightening, a control circuit for controlling each operation is also required. Due to its complexity, it was prone to many failures and was inconvenient to handle.

In order to solve the above problem, the inventor conducted intensive research and found that
By effectively utilizing the output near the dead center of the crank mechanism, the present invention was completed by discovering that the opening/closing of the movable type and the tightening of the movable type can be performed using a single mechanism.

The present invention provides a rubber extrusion head in which nozzle passages are formed in the upper and lower sides, and a tightening means that is arranged on the fixed head and includes a crank mechanism for the upper throat and the lower throat that are pivotally supported on the fixed head. Rubber extrusion allows for the opening and closing of the upper head, the lower part, and the tightening of the fixed head using only the single mechanism described above, which simplifies the structure and operation. The purpose is to provide heads.

[Means for solving problems]

In order to solve the above-mentioned problems, the rubber extrusion head of the present invention has notches at the top and bottom of the tip of the base body, which has upper and lower rubber passages leading from the upper rubber extruder and the lower rubber extruder arranged on the rear surface. A fixed head provided with a notch having upper and lower mating slopes disposed in a thin tapered shape by being bent, and a mating vertical surface extending from the rear end of the lower mating slope. an upper head having a split surface that is rotatably pivotally connected to and that is brought into close contact with the notch by rotation to form a nozzle passage that is connected to the rubber passage between the mating slope and opens at the tip; The lower head, the upper head, and the lower head are rotatable and are provided with tightening means for tightly contacting the fixed head,
The tightening means includes a crank member pivotally supported by a fixed head and rotated by a drive machine, and two screws connecting the crank member, the upper head, and the lower head in the close contact state, respectively, near the dead center of the crank member. and a connecting rod, and the tightening means are arranged on both sides of the fixed head.

In addition to the reduction motor, the driving device can be formed by a hydraulic motor, a rotary actuator, etc., and the crank member can also be formed by a gear.

[Effect]

The upper head and the lower head are rotatably attached to the fixed head, and have mating slopes that come into close contact with the notch of the fixed head when rotated, so that the nozzle passages of the upper and lower heads are connected to the rubber passage by close contact. Rubber sent from a rubber extruder can then be introduced into the rubber passage.

Further, since the upper head and the lower head are each rotatable and are provided with a tightening means for bringing them into close contact, the upper head and the lower head can be opened, closed and tightened by a single means.

Moreover, the tightening means has a crank member that is pivotally supported by the fixed head, and when the upper head and the lower head are in close contact with the identification head, the upper head and the lower head are moved near the dead center of the crank member. Since it has two connecting rods that are respectively connected to the fixed head, the upper head and the lower head can be pressed tightly against the fixed head by a large tensile or compressive force generated near the fulcrum.

Therefore, the upper head and lower head are continuously tightened into the fixed head during opening and closing operations, and the large tightening that occurs near the dead center is fixed by force and is pressed against the rad, resulting in rubber being injected from the nozzle passage. Even when the upper head, the lower head and the fixed head are in close contact with each other,
Rubber can be injected reliably and accurately.

Further, since the upper head and the lower head are respectively connected to the crank member using two connecting rods, the operations of the upper head and the lower head can be easily synchronized. In addition, since the crank member is rotated by a drive machine, the opening and closing of the upper and lower heads and tightening are performed continuously. As a result, there is no need to separately install a hydraulic cylinder for tightening, and there is no need to provide an interlock. No longer needed. In this way, the present invention simplifies the mechanism for operating the upper and lower heads.

In addition, the tightening means are arranged on both sides of the fixed head and are synchronized so that the forces and speeds applied to the stile branches on both sides of the upper and lower heads are uniform. Therefore, even if a foreign object gets caught between the upper head, the lower head, and the fixed head, the upper and lower heads will not be twisted, and the upper and lower heads can be protected from damage. .

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

In the figure, the rubber extrusion head 1 of the present invention has an upper head 3 and a lower head 4 pivoted on the fixed head 2 above and below the fixed head 2, respectively, and the upper head 3 and the lower head 4 can be rotated. Tightening means 5 for tightly fitting the fixed head 2
has been established.

The fixed head 2 has an L-shaped support leg 26 connected to the center of the rear surface E, which has a seat plate that can be seated on a floor body, and forms the base body 6 of the rubber extrusion head 1. Further, the fixed head 2 connects the rubber extruder A1 and the lower rubber extruder A2 at the rear surface E and above and below the supporting legs 26, respectively.

In this embodiment, the upper rubber extruder A1 and the lower rubber extruder A2 are constructed by inserting a delivery screw 27 into the hole of a cylindrical outer cylinder having a hole in the center. By rotating, the rubber material charged into the hole can be sent forward while being refined.

The fixed head 2 is a block body whose both sides are finished substantially flat and whose top and bottom ends are cut off.

The cutout of the fixed head 2 allows the upper mating slope 7 and the lower mating slope 9 to be arranged in a light-extinction tapered shape, and the rear ends B1 from each of the upper mating slope 7 and the lower mating slope 9.
, upward and downward from B2 and the upper mating slope 7;
Upper mating elevation 1 rising approximately at right angles to lower mating slope 9
0, an upper notch 12 and a lower notch 13 having a lower mating vertical surface 11 are formed.

Further, the fixed head 2 is connected to the upper rubber extruder A on the rear surface E.
I, lower rubber extrusion fj! An upper rubber passage 14 having a circular cross section and conducting to the holes J and A2 respectively and extending to the rear end Bl of the upper mating elevation 7 and the rear end B2 of the lower mating elevation 9, respectively;
A lower rubber passage 15 is provided.

The upper head 3 is a block body disposed in the upper notch 12 and having approximately the same size of 11 as the fixed head 2,
It has a split surface 16 that fits into the notch 12 and comes into close contact with the upper mating surface 1 of the fixed blade 2, and a back surface 31 that comes into close contact with the upper mating surface 1o.

The upper head 3 is rotatably supported on the fixed head 2 at the intersection of a bracket 33 that rises from the identification head 2 and a bracket 34 that rises from the upper head 3 by a rotation pin 35 that passes through both brackets. , the pivot pin 35 forms the fulcrum 01 of the upper head 3 relative to the fixed head 2.

Further, when the upper head 3 is in close contact with the fixed head 2, it is disposed on the split surface 16, and one end is electrically connected to the upper rubber passage 14 at the back surface 31.
A nozzle flow path 19 whose other end extends to the tip F is provided.

In this embodiment, the nozzle flow path 19 has a semicircular shape matching the cross section of the upper half of the rubber passage 14 on the back surface 31, and forms a flat hole that widens laterally at the inlet. In this embodiment, the mating slope 7 on the fixed head 2 also has the same shape.
A nozzle groove 36 is formed by cutting off the mating slope 7 of H, and is symmetrical to the nozzle flow path 19.

The lower head 4 is formed symmetrically below the upper head 3, and has a split surface 17 that is in close contact with the lower mating surface 9 and a back surface that is in close contact with the mating vertical surface 11 of the lower part. A nozzle flow path 20 is provided on the split surface 17. Further, the nozzle flow path 20 faces the nozzle a37 of the lower mating slope 9.

Also, like the upper head 3, the lower head 4 can rotate about the rotation pin 35 arranged at the fulcrum 02 about U2.

The tightening means 5 consists of a crank member 21 that is pivotally supported on the fixed head 2, and two connecting rods 22, 23 that connect the crank member 21 to the upper head 3 and the lower head 4, respectively. The means 5 are arranged on each side of the fixed head 2.

The crank member 21 has a central hole attached to a crankshaft 41 that horizontally passes through the fixed head 2 at the intermediate height and rear of the fixed head 2 and is rotatably supported by the fixed head 2, and has toothed portions 42 on the circumferential surface. It is a gear body with Further, the tooth portion 42 is disposed in the hole of the support leg 26 and meshes with the luchinion 43. In this embodiment, the pinion 43 is attached to a drive shaft 44 that passes through the support leg 26 and is pivotally supported by the support leg 26, and the drive shaft 44 is connected to the reduction motor M.

One end of the connecting rod 22 is supported by a pin on a crank pin 46 that projects laterally from the crank member 21 while the upper head 3 is in close contact with the fixed head 2.
A center line passing through the center of the connecting rod 22 is the crankshaft 4.
1 , and the other end thereof is fitted into a connecting pin 47 protruding from the side surface 1 2 of the upper head 3 .

The other connecting rod 23 is formed in contact with the one connecting rod 22, and in order to avoid interference with the one connecting rod 22, the other connecting rod 23 is disposed symmetrically with its position shifted in the lateral direction. Therefore, the connecting rods 22 and 23 intersect near the center o3 of the crankshaft 41.

Each connecting rod 22, 23 has a sixth connecting rod at its other end.
As shown in the figure, by rotating the eccentric bushing 49 which is pivotally supported by the connecting pin 47 via the eccentric bushing 49,
The hole spacing of the connecting rods 22, 23, that is, the pinch length can be adjusted.

The crank member 21 rotates in the forward and reverse directions via the teeth 42 meshed with the pinion 43 by rotating the driving machine M connected to the pinion 43 in the forward and reverse directions. As the crank member 21 rotates as described above, the crank member 21 and one connecting rod 22 form a crank mechanism in which the upper head 3 can rotate around the fulcrum 01. The other connecting rod 23
A crank mechanism for rotating the lower head 4 about the fulcrum 02 is thus formed.

Further, when the upper head 3 and the lower head 4 are in close contact with the fixed head 2 as described above, the connecting rods 22 and 23 respectively pass through the center 03 of the crank member 21, and the upper head 3 and the lower head 4 are in close contact with the fixed head 2.
Therefore, in the close contact state, the two connecting rods 22 and 23 are joined near the far dead center 04 of the crank member 21.

In this way, near the far dead point 04 of the crank mechanism,
A large tensile force is generated in the connecting rods 22 and 23, and therefore, just before the upper head 3 and the lower head 4 are in close contact, the upper head 3 and the lower head 4 have a large pressing force and are pressed against the upper mating slope 7. The split surface 16 and the lower mating slope 9 and the split surface 17 come into contact with each other. In this embodiment, the center line connecting the hole centers of the connecting rods 22 in the upper head 3 and the upper mating slope 7 are arranged so as to intersect at an acute angle of 90 degrees or less on the front side, Moreover, the center line intersects the upper mating elevation 10 at an acute angle of 3 4 .

On the other hand, in the lower head 4 as well, the center IL of the connecting rod 23 intersects the lower mating slope 9 and the lower mating vertical surface 11, similarly to the upper head 3.

Therefore, due to the forward rotation of the driving machine M, the upper head 3 and the lower head 4 rotate simultaneously and at the same speed about the respective fulcrums 01.02, and the notch 12.
Close to 13.

As the upper head 3 and the lower head 4 approach the notch 12.13, the connecting rod 22.23 is located near each dead center 04 of the crank member 21, and as a result, the upper head 3 and the upper head 4 are subjected to a large push. This will create pressure and fit into the cutout 12.13.

Also, due to their fitting, each nozzle flow path 19, 20 of the upper nozzle 3 and lower head 4 is connected to the upper rubber extruder A1,
It communicates with the lower rubber passage 15 which leads to the lower rubber extruder A2.

Moreover, since each axis L of the connecting rod 22.23 intersects each mating slope 7.9 and mating elevation 10.11 at an acute angle of 90 degrees or less, the upper head 3, the lower head 4
The split surface 16.17 and the back surface 31.32 fit into each of the notches 12.13 in a curved manner, and in combination with the strong pressing near the fulcrum 04.05, firmly adhere to the fixed head 2. .

Therefore, even if rubber is extruded from the rubber extruders iAl and A2 with high pressure, the upper head 3 and the lower head 4
can reliably maintain a close contact state without coming loose from the fixed head 2.

Also, by rotating the driving machine M in the reverse direction, the crank member 21
rotates, and as shown in FIG. 4, the upper head 3 and lower head 4 rotate upward and downward, respectively, and the cutouts 12 and 13 are opened. When the upper and lower heads 3.4 are operated symmetrically by one crank member 21 as in the present invention, in which inspection and cleaning of the nozzle flow path 19.20 is facilitated by the opening, the crank member 21 The unbalanced load applied to 21 is canceled out, and the tightening means 5 can operate smoothly.

Furthermore, since the tightening means 5 are arranged on both sides of the fixed head 2, the upper head 3 and the lower belly button 56 can be moved smoothly, and also between the upper head 3, the lower head 4 and the fixed head 2. Even if foreign matter gets caught in the device, damage to the device can be prevented without dust forming on each member.

FIG. 8 shows another embodiment of the invention.

In this example, the upper head 3 is formed by a plurality of block pieces, in this example, upper and lower two block pieces 3a and 3b. The block pieces 3a, 3b have contact surfaces 51A, 51 that are in close contact with each other.
The contact surfaces 51A and 51B extend to the tip F. Further, the contact surfaces 51A and 51B are provided with a nozzle passage 19a that communicates with the rubber passage 14a connected to the rubber extruder A3 above and opens at the tip F.

Each block piece 3a, 3b is pivotally supported by the fulcrum 01, and the connecting rod 22 is connected to the upper block piece 3a of the upper and lower block pieces 3a, 3b.

Therefore, the crank member 2
By connecting the connecting rods 22 near the dead center of the head 1, the upper block piece 3a presses the fixed head 2 with the lower block piece 3b in between.

The upper head 3 is divided in this way, and the nozzle passages 19.1 each communicate with a plurality of extruders and can be opened.
9a, it is possible to press the block pieces 3a and 3b at the same time by using the crank member and the connecting rod of the present invention.

Note that in this example, the lower head 4 also has the same functions as the upper head 3.
It is formed by two block pieces 4a and 4b that are divided into upper and lower parts and have nozzle passages 20a on their contact surfaces.

〔Effect of the invention〕

Like soft soil, the rubber extrusion head of the present invention operates the upper head and lower head disposed above and below the fixed head by tightening means consisting of a crank member and two connecting rods that are pivotally supported by the fixed head. Therefore, the upper head and the lower head can be operated simultaneously and synchronously with a simple configuration consisting of a single tightening means, and even if the rubber extrusion head is formed in multiple stages, , its structure can be simplified.

In addition, when the upper head and lower head are in close contact with the fixed head, since the connecting rod is connected near the dead center of the crank member, a large pressing force is applied to the upper head and lower head just before they come into close contact with the fixed head. It can be applied and firmly adhered. Therefore, it is possible to open, close, and seal the upper and lower heads with a single mechanism, which simplifies the configuration compared to the conventional structure in which opening, closing, and sealing were operated using separate 'AH's. , and since an ink lock is not required, significant cost reductions can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a right side view with the drive machine omitted, Fig. 3 is a sectional view taken along line A-A, and Fig. 4 is a sectional view taken along line A-A.
The figure shows the right side view with the upper and lower heads open.
Figure 5 is a perspective view showing the main parts in the state shown in Figure 4;
The figure is a cross-sectional view schematically showing the connection between the connecting rod and the upper head and the lower head, Figure 7 is a line diagram showing the action, Figure 8 is a side view showing another embodiment, and Figure 9 is a diagram showing the prior art. FIG. 2 is a schematic front view. 2-Fixed head, 3-Upper head, 4-Lower head, 6-Base, 7-Upper mating slope, 9-Lower mating slope, 10-Upper mating elevation, 11-Lower Combined elevation, 12.13
- notch, 14 - upper rubber passage, 15 - lower rubber passage, 16. 17 - split surface, 19. 20 - nozzle passage,
21-crank member, 22.23 series of knots, AI-upper rubber extruder, A2-lower rubber extruder, E-rear, F--tip, M-driver.

Claims (1)

[Claims] 1. The upper and lower ends of the base body, which has upper and lower rubber passages leading from an upper rubber extruder and a lower rubber extruder disposed on the rear surface, are cut out so that the base body is arranged in a thin tapered shape. On top of that,
a fixed head provided with a notch having a lower mating slope and a mating elevation extending from the rear ends of the upper and lower mating slopes; a fixed head rotatably pivoted to the fixed head; An upper head and a lower head each having a split surface that forms a nozzle passage that conducts to the rubber passage and opens at the tip between the mating slope and the upper head and the lower head can be rotated and fixed. The tightening means includes a crank member which is pivotally supported by a fixed head and rotated by a drive machine, and which connects the crank member, the upper head, and the lower head to the head. A rubber extrusion head consisting of two connecting rods that are connected to each other near the dead center of the crank member when in a close contact state, and furthermore, the tightening means are arranged on both sides of the fixed head. 2. The upper head or the lower head is divided into a plurality of upper and lower block pieces each having a contact surface that closely contacts each other, and the contact surface is connected to a rubber passage and is open at the tip. 1. The connecting rod connects the crank member and the outermost block piece near the dead center of the crank member when the block pieces are in close contact with each other. Rubber extrusion head as described. 3. The rubber extrusion head according to claim 1, wherein the crank member is a gear.