JPS6140336Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a floating weight actuating device for an internal kneader.

Generally, in an internal kneading machine, as shown in Figs. 1 and 2, a predetermined amount of the material to be kneaded is fed into a hopper 2 connected to a kneading machine body 1 from an input port 3, and the material is fed into the hopper 2. The materials to be kneaded are pushed into the kneading chamber 5 by a floating weight 4 which can be raised and lowered freely, and a pair of rotors 6 are rotated in the direction of the arrow while the kneading chamber 5 is sealed to knead the material. The drop door 7 at the bottom is opened to discharge the material to be kneaded out of the machine.

In this type of internal kneading machine, in order to properly knead the materials to be kneaded, it is necessary for the floating weights 4 to have appropriate cushioning properties in the vertical direction, and the floating weights 4 must be used when the materials to be kneaded are introduced. , it is necessary to lift it to a position near the input port 3 so as not to interfere with its input.

Therefore, conventionally, a screw shaft support (ball screw nut) 10 rotatably supported by a support frame 8 on the kneading machine main body 1 via a bearing 9,
A mechanical up-and-down device 1 includes a screw shaft 11 screwed into the screw shaft for vertical movement, and a motor 13 that rotationally drives the screw shaft support 10 via a winding transmission mechanism 12.
4, a cushion cylinder 15 is connected to the lower end of the threaded shaft 11, and a piston rod 17 is connected to the piston 16 of the cushion cylinder 15.
Floating weight 4 is connected via. During kneading, the cushion cylinder 15
compressed air is supplied inside the floating weight 4, and the cushioning property of the floating weight 4 is ensured by the air pressure.
Further, when feeding the material to be kneaded, the screw shaft support 10 is rotated by the motor 13, and the floating weight 4 is moved up and down via the cushion cylinder 15 by the screw shaft 11 screwed thereto. This mechanical up-and-down device includes a rotatable screw shaft 11 mounted on the top of a hopper 2 with one end supported, and a screw shaft support 1 screwed into the screw shaft 11 that can be moved up and down.
0 is provided in the cushion cylinder 15, and the cushion cylinder 15 and the piston rod 17 are provided with a hole for accommodating the screw shaft 11, and the screw shaft support 10 is moved up and down by a drive means for rotating the screw shaft 11. It is also possible to configure the floating weight to be operated via the cushion cylinder 15.

In this case, the vertical movement range of the floating weight 4 is detected by limit switches 18 and 19 via the cushion cylinder 15, and when the limit switches 18 and 19 are activated, the motor 13 is stopped. At the lower limit position of the weight 4, at the upper end of the kneading machine main body 1,
A rubber-like protrusion is provided as a stopper 20 as a mechanical safety device, and the stopper 20 is used to restrict the movement. However, since the clogging of the materials to be kneaded from the hopper 2 to the kneading chamber 5 is not constant,
It is not determined at what position the floating weight 4, ie, the piston 16, stops. Therefore, in extreme cases, the force applied to the threaded shaft 11 will be only its own weight, or it will receive a large reaction force from the air pressure of the cushion cylinder 15. Therefore, even if the motor 13 is equipped with a brake, the position at which the cushion cylinder 15 is stopped by the limit switch 19 will not be constant because of the difference in inertia.
In particular, if the force applied to the screw shaft is only its own weight, the inertia will be large, and the cushion cylinder 15 will drop significantly and come into contact with the stopper 20, and the bearing 9 will move through the cushion cylinder 15, screw shaft 11, etc.
There was a risk of overload occurring. Furthermore, if the vertical position of the limit switch 19 is incorrectly adjusted, the cushion cylinder 15 will come into contact with the stopper 20, and the cushion cylinder 15 and screw shaft 11 will come into contact with the stopper 20.
Since overload occurs on the bearing 9 through the above, it is necessary to strictly control the mounting position of the limit switch 19. Furthermore, during kneading, the motor 13 is stopped at the lower limit position where the limit switch 19 detects the cushion cylinder 15, but the floating weight 4 accompanying the kneading action is
Since the impact of the vertical movement of the bearing 9 is always transmitted from the cushion cylinder 15 to the bearing 9 via the threaded shaft 11, etc., there is a risk that the bearing 9 will be damaged, which also poses a problem in terms of durability.

In view of these conventional problems, the present invention prevents the cushion cylinder from lowering too much due to inertia by receiving the piston of the cushion cylinder with a stopper, and at the same time prevents the cushion cylinder from lowering too much due to inertia. It was provided with the aim of eliminating the impact on the vertical device of the impact caused by the vertical movement of the floating weight during kneading. A floating weight provided vertically movably in the hopper of the cushion cylinder is connected to a piston that is vertically slidably fitted into the cushion cylinder and is prevented from falling out by a retaining ring at the lower end of the cushion cylinder. In a floating weight actuating device for a closed kneading machine equipped with a mechanical up-and-down device for moving the floating weight up and down through the A lower limit stopper that fits inside the retaining ring and contacts the piston from below is provided on a support plate mounted on the kneading machine body, and when the lower limit stopper contacts the piston, the retainer ring and support plate are connected. The point is that there is a gap between them.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 3, 21 is a kneading machine main body, and a support frame 23 is erected thereon with a support plate 22 interposed therebetween. 24 is the hopper 2 of the kneading machine main body 21
5 is a floating weight arranged vertically movably, and is connected to a piston 28 of a cushion cylinder 27 via a piston rod 26. The piston rod 26 is inserted into the support plate 22 so as to be able to slide up and down, and a stopper 29 is provided in the center of the support plate 22 concentrically with the piston rod 26, and the upper surface of this stopper 29 is equipped with a cushioning rubber or spring. An elastic body 30 such as the above is attached. The height of this stopper 29 is determined so that the floating weight 4 stops at the lower limit position. The cushion cylinder 27 has a head cover 31 at the upper end and a retaining ring 32 at the lower end. The retaining ring 32 is configured to have a size that fits over the stopper 29 when the cushion cylinder 27 is lowered, so that the floating At the lower limit position of the weight 24, the piston 28 contacts the stopper 29 via the elastic body 30. 34 is a floating weight 24 via a cushion cylinder 27.
A screw shaft support 35 disposed on the axis of the piston rod 26.
, a screw shaft 36 screwed into the screw shaft support 35 via a ball so as to be movable up and down, and the screw shaft support 35
It has a motor 37 that rotates. The screw shaft support 35 is the support plate 3 on the upper end side of the support frame 23.
The threaded shaft 36 is rotatably held by the shafts 8 and 39 via bearings 40 and 41, and the screw shaft 36 is connected to the head cover 31 of the cushion cylinder 27 at its lower end. The motor 37 is equipped with an electromagnetic brake and is attached to the support frame 23 via a bracket 42, and is operatively connected to the screw shaft support 35 via a pulley 43, a belt 44, and a pulley 45. . A cooling pipe 46 is connected and fixed to the floating weight 24, and is slidably inserted into the support plates 22, 39, the head cover 31, and the retaining ring 32. The cushion cylinder 27 is guided so as to slide in a groove in the frame 23. 47 is a limit switch for detecting the lower limit, and the retaining ring 3 is installed so that the piston 28 stops at the position where it contacts the stopper 29.
It is activated by 2. Reference numeral 48 denotes a limit switch for abnormality detection, which is operated by a projection 49 of the piston 28 via a swinging rod 50.

Next, the operation of the above configuration will be explained. When feeding the material to be kneaded, the floating weight 24 is raised to the upper limit position as shown in the figure, and the material is introduced into the hopper 25. Next, start the motor 37,
When the screw shaft support 35 is rotated, the screw shaft 36 screwed thereon is sent downward, and the floating weight 24 and cushion cylinder 27 are lowered together. The limit switch 47 is operated by the retaining ring 32, the motor 37 is stopped, and when the retaining ring 32 of the cushion cylinder 27 reaches the position where it fits onto the stopper 29, that is, the lower limit position of the floating weight 24, the imaginary line As shown in FIG. 2, the piston 28 of the cushion cylinder 27 comes into contact with the stopper 29, and the floating weight 24 stops descending at the lower limit position. in this case,
When the piston 28 contacts the stopper 29,
The pneumatic pressure of the cushion cylinder 27 acts as a reaction force on the screw shaft, increasing the inertia and preventing the cushion cylinder from overrunning. Also, since there is a gap between the retaining link 32 and the support plate 22, the limit switch Even if there is slight variation in the mounting position of 47, the two will not come into direct contact.
Therefore, the permissible range of positional accuracy of the mounting position of the limit switch 47 is wide, and strict management of positional accuracy is not necessary.

During kneading, the floating weight 24 repeatedly moves up and down, and at its lower limit, the piston 28 comes into contact with the stopper 29, so that the impact caused by the up and down movement can be received by the kneading machine main body 21 via the stopper 29. , the vibration is not transmitted to the vertical device 34 via the cushion cylinder 27, and the influence on the vertical device 34, especially damage to the bearing 41, can be prevented.

As detailed in the embodiments above, according to the present invention,
The cushion cylinder 27 is moved by the up/down device 34 so that the floating weight 24 is located at the lower limit position.
A lower limit stopper 29 is provided on the support plate 22 mounted on the kneading machine main body 21, which fits into the retaining ring 32 at the lower end of the cushion cylinder 27 and contacts the piston 28 from below when the kneader is lowered. Therefore, it is possible to prevent the cushion cylinder 27 from overrunning when descending, and the impact caused by the vertical movement of the floating weight during kneading does not directly affect the vertical movement, thereby significantly improving durability.

Furthermore, the piston 2 of this lower limit stopper 29
8, the retaining ring 32 and the support plate 22
Since there is a gap between the cushion cylinder 27 and the lower limit position, even if a detector is installed to detect the lower limit position when the cushion cylinder 27 is lowered, the positional accuracy of the mounting position is not required, and the tolerance range is can be made larger.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a conventional example, FIG. 2 is a sectional view of the main body of the kneading machine, and FIG. 3 is a sectional view showing an embodiment of the present invention. 21...Kneading machine main body, 22...Support plate, 23...
...Support frame, 24...Floating weight, 25...Hopper, 26...Piston rod,
27...Cushion cylinder, 28...Piston, 29...Stopper, 34...Mechanical up and down device, 35...Screw shaft support, 36...Screw shaft.

Claims (1)

[Scope of utility model registration request] A floating weight 24 provided vertically movably in the hopper 25 of the kneading machine main body 21 is fitted inside the cushion cylinder 27 so as to be vertically slidable, and a retaining ring 3 at the lower end of the cushion cylinder 27 is fitted.
In a floating weight operating device for a closed kneading machine, the floating weight actuating device for a closed kneading machine is provided with a mechanical up and down device 34 for connecting a piston 28 which is prevented from coming out by a cylinder 27 and moving the floating weight 24 up and down via a cushion cylinder 27. When the cushion cylinder 27 is lowered so that the floating weight 24 is located at the lower limit position, the retaining ring 32
A lower limit stopper 29 that fits inside and contacts the piston 28 from below is provided on the support plate 22 mounted on the kneader main body 21, and this lower limit stopper 2
9. A floating weight actuating device for an internal kneading machine, characterized in that a gap is provided between a retaining ring 32 and a support plate 22 when the ring 9 is in contact with a piston 28.