JPH0643059B2 - Kneader gate device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gate device for a kneader.

(Prior Art) A kneading machine used when kneading various polymeric materials such as plastic and rubber and plastic materials is provided with a gate device in the flow direction of the material to be kneaded or in the vicinity of the discharge port to control the flow rate. The gate device may be adjusted. For example, there is a gate device disclosed in Japanese Patent Application Laid-Open No. 1-95308.

FIG. 4 shows the gate device. In the figure, reference numeral 35 denotes a housing, a kneading chamber 36 is formed in the housing 35, and two rotors 37, 37 are rotatably inserted in the kneading chamber 36.

38 and 39 are a pair of upper and lower gates, which are mounted from the upper and lower sides of the housing 35, and opposite end surfaces thereof are formed by cutting out into two substantially semicircular shapes so as to accommodate the rotors 37 and 37. There is. Reference numerals 40, 40 denote screw shafts, which are mounted by thrust bearings 41 projecting from the side of the housing 35 so as to be rotatable and immovable in the axial direction. This screw shaft 40,40
On the upper and lower sides in the axial direction, respectively, threaded portions 42 and 43 which are opposite to each other are formed, and the threaded portions 42 and 43 are respectively screwed into the left and right protruding portions 44 and 44 of the gates 38 and 39, respectively. There is. Further, 45 is a worm wheel, which is fixed to the upper ends of the screw shafts 40, 40, and a drive shaft 47 having worms 46 meshing with the wheel 45 on the left and right end sides is located above the upper gate 38 and left and right. Is installed between the screw shafts 40, 40 of. Reference numeral 48 is a drive source such as a motor for rotating the drive shaft 47.

Then, the rotation of the drive shaft 47 is converted into the rotation of the left and right screw shafts 40, 40 through the engagement of the worm 46 and the worm wheel 45, and the upper and lower gates 38, 39 are synchronously moved toward or away from each other. Kneading chamber by adjusting the opening
The flow rate of the material to be kneaded in the 36 is adjusted.

(Problems to be Solved by the Invention) In the conventional gate device described above, the upper and lower gates are driven by one driving source.
Although it is certainly preferable in that the 38 and 39 can be operated synchronously, it has the following drawbacks.

First, since the left and right protrusions 44 on the lower gate 39 provided to be screwed with the screw shaft 40 protrude more than the width of the housing 35, it takes a lot of time and effort to assemble and disassemble the gate device. That is, in the case of the gate device shown in FIG. 4, when the gate device is assembled, the lower gate 39 is placed before the housing 35.
However, it was necessary to install the upper gate 38 and the drive mechanism afterwards in the vicinity of the housing 35 while aligning with the lower gate 39. Further, at the time of disassembling, the lower gate 39 must be detached at least after the housing 35 is divided at a certain position of the gate device and one of the housings 35 is moved. It was a big work.

Furthermore, since the width of the gate device is increased due to the presence of the protrusion 44, for example, when the gate device is installed near the discharge port of the kneader and the gear pump is connected to the side thereof, the gear pump In some cases, the distance between the kneading machine and the kneading machine becomes large and the flow resistance of the resin between the gear pump and the kneading machine increases, which causes an increase in pressure in the kneading machine.

Also, the inner surface of the housing 35 and the gate 3 existing in the kneading chamber 36
The sliding guide surface S '(see FIG. 4) where 8 and 39 slide against each other is
From the viewpoint of preventing leakage of the material to be kneaded, etc., it is preferable that the amount is as small as possible.
The sliding guide surface S'is generated in both 38 and the lower gate 39.

The present invention has been made in view of the above circumstances, and provides a kneading machine gate device that is easy to assemble and disassemble into a kneading machine and is compact, and that can reduce sliding guide surfaces as much as possible. The purpose is to do.

(Means for Solving the Problem) In order to achieve the object, the present invention takes the following technical means.

That is, according to the present invention, a kneading chamber 2 is formed in a housing 1, a rotor is rotatably inserted in the kneading chamber 2, and a pair of upper and lower gates 3 protruding into the kneading chamber 2 are provided.
In the gate device of the kneading machine, in which the opening and closing of the kneading chamber 2 as the passage for the material to be kneaded is freely adjustable, the four gates 4 are arranged close to and away from each other. Lower gate arms 7 and 7 for guiding directional sliding are integrally provided so as to project upward, and the lower gate arms 7 and 7 are provided.
Is housed in the housing 1 together with the lower gate 4.

(Operation) In the present invention, the lower gate arms 7 and 7 are housed in the housing 1 together with the lower gate 4, and are vertically moved along the inner surface of the housing 1.

On the other hand, the upper gate 3 is housed between the lower gate arms 7 and 7 and is vertically moved by being guided by the arms 7 and 7.

(Example) Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 3, a housing 1 has a kneading chamber 2 inside, and two rotors (not shown) are rotatably inserted in the kneading chamber 2. Reference numerals 3 and 4 are a pair of upper and lower gates, and the end surfaces facing each other are cut into two substantially semicircular shapes so as to face the rotor, and the recesses 5 and 5 are formed.
5 is formed. In addition, a meshing claw 6 is formed at the joint between the gates 3 and 4, respectively.
Is a so-called interlocking type.

Reference numeral 7 denotes a lower gate arm, which is symmetrically fixed to the left and right ends of the lower gate 4 with bolts 8 and is housed together with the lower gate 4 in the housing 1. The arms 7 and 7 have a height about twice that of the lower gate 4 and are mounted so as to project above the lower gate 4 by the difference. The upper gate 3 is provided so as to be interposed between the lower gate arms 7 and 7, and is guided by the arms 7 and 7 to slide in the vertical direction.

Above the housing 1, a drive mechanism 9 for moving the gates 3 and 4 toward and away from each other is formed.

Among them, 10 is a drive base, which is fixed to the housing 1 with a fixed distance via a fixing rod 11 which is screwed onto the upper surface of the housing 1 and is provided upright.
A motor 13 is installed on the upper surface of the bali base 10 via a bracket 12, and a speed reducer 14 and a gear box 15 which are linked with the motor 13 are further provided.

Reference numeral 16 denotes a screw shaft, which is inserted through the gear box 15 and the drive base 10 at the center and is attached so as to be located on the center line of the gate device. In the gear box 15, the drive shaft (not shown) from the motor 13 and the screw shaft 16 are worm meshed with each other. Since the worm and the screw shaft 16 are connected by the key 50, the screw shaft 16 Is rotatable with respect to the drive base 10 and is immovable in the axial direction.

Threaded portions 17 and 18 in directions opposite to each other are formed on both axial ends of the screw shaft 16, and the upper screw portion 17 is a guide arm 1
9 in the center, the lower screw part 18 in the center of the upper gate 3,
They are screwed together via screw bearings 20 and 21, respectively.

Reference numerals 22 and 22 denote guide rods, which are connected to the left and right ends of the guide arm 19 via nuts 23 so as to extend downward.
It penetrates through the drive base 10 and is screwed and coupled to the upper end side of the lower gate arm 7 at the lower end. A stopper collar 24 regulates the upper limit position of the lower gate 4 and is provided between the lower gate arm 7 and the drive arm 10.

Reference numeral 25 is a sliding shoe, which is interposed between the lower gate arm 7 and the housing 1 and is pressed from the outside of the housing 1 by a pivot pin 26 as shown in FIG. That is, a tightening bolt 29 is screwed into a socket 28 attached to the side surface of the housing 1 via a bolt 27, and the tightening bolt 29 causes the pivot pin 26 to rotate.
The head portion of the gate is pressed, and the lateral pressing force on the gates 3 and 4 can be changed.

In addition, 30 is a cooling water passage and 31 is a thermocouple, and these are for keeping the temperature of the gates 3 and 3 suitable, respectively. Reference numeral 32 denotes a potentiometer, which is provided above the screw shaft 16 via a bracket 33 which is erected from the base 10 and which detects the vertical position of the lower gate 4.

In this embodiment, the assembly of the gate device itself having the above-mentioned configuration can be carried out at a kneading machine, that is, at another work place separated from the housing 1, and the assembly to the housing 1 can be carried out after the assembly is completed.

That is, in the gate apparatus, the lower gate arms 7 and 7 are housed together with the lower gate 4 in the housing 1, and the upper gate 3 is housed between the lower gate arms 7 and 7. Since 4 can also be removed from above the housing 1 together with the upper gate 3, after assembling the drive mechanism 9 and the like, the gate device is lifted by a crane or the like (not shown) and the housing 1
It can be built in. As for the work around the housing 1, it is sufficient to fix the drive base 10 to the housing 1 with the fixing rod 11, and there is no need to align the upper and lower gates 3 and 4 as in the conventional case.
Assembly can be performed very simply and quickly.

Further, when disassembling the gate device for maintenance or the like, contrary to the above, the fixing rod 11 can be removed and the entire gate device can be directly pierced upward from the housing 1 as it is. You don't have to.

Further, in this embodiment, since the upper and lower gates 3 and 4 are all housed in the housing 1 and the drive mechanism 9 thereof is also entirely arranged above the housing 1, the entire apparatus is very compact especially in the width direction. It has become. Therefore, even when a gear pump is provided on the side of the gate device, for example, the horizontal distance from the pump is reduced, and the pressure increase in the kneading chamber 2 can be effectively prevented.

Further, in the present embodiment, the sliding guide surface S existing in the kneading chamber 2 of the housing 1 has the lower gate arm 7 and the upper gate 3
Exists only where they abut (see FIG. 1),
The possibility that the material to be kneaded leaks out from the guide surface S is much less than in the conventional case. Therefore, the material to be kneaded solidifies near the guide surface S and the gates 3 and 4 do not move. Very few fears.

The present invention is not limited to the above embodiment, but may be formed by integrally molding the lower gate arm 7 and the lower gate 4, for example.

Needless to say, it can be applied to kneaders other than the twin-screw type.

(Effects of the Invention) As described above, according to the present invention, the lower gate arms 7 and 7 are housed together with the lower gate 4 in the housing 1, and the upper gate 3 is further included in the lower gate arms 7 and 7.
Since it is housed between them, both gates 3 and 4
Can be inserted and removed at once from above the housing 1,
Assembling and disassembling the kneading machine is very simple, and the gate device as a whole can be made compact.

Further, according to the present invention, the sliding guide surface S in the kneading chamber 2 can be reduced as much as possible, and leakage of the material to be kneaded can be prevented.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a partially cutaway front view of a gate device, FIG. 2 is a side view of the same, and FIG. 3 is a line III-III of FIG. A sectional view and FIG. 4 are front views of a conventional gate device. 1 ... Housing, 2 ... Kneading room, 3 ... Upper gate,
4 ... Lower gate, 7 ... Lower gate arm.

Claims (1)

[Claims] 1. A kneading chamber (2) is formed in the housing (1),
A rotor is rotatably inserted in the kneading chamber (2), and a pair of upper and lower gates (3) projecting into the kneading chamber (2).
In the gate device of the kneading machine, in which the opening of the kneading chamber (2) as the material passage to be kneaded is provided so as to be able to approach and separate from each other (4), on the left and right ends of the lower gate (4). , A lower gate arm (7) (7) for guiding the vertical sliding of the upper gate (3) is integrally provided in a projecting upward shape, and the lower gate arm (7) (7)
Is a gate device for a kneader, which is housed in the housing (1) together with the lower gate (4).