JPH0245491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing device for powder and granular materials, and more particularly to a mixing device that mixes a certain amount of powder and granular materials in a mixing tank equipped with mixing blades.

In general, powder and granules made of different materials stored in a plurality of storage tanks are supplied in fixed amounts to a mixing device for mixing, and the mixed powder and granules are transported from the mixing tank. It is supplied to the weighing hopper of the weighing device through a quantitative feeding device such as a screw feeder, rotary leaf feeder or table feeder, and after being weighed by the weighing device, it is fed to the mixing tank of the mixing device. A transport tank is provided below, and the powder and granules mixed in the mixing device are discharged from the mixing tank to the transport tank of the pneumatic transport device, and the powder and granules are transported from the tank through an air transport pipe by an air pump. It was transported by air.

However, in such conventional cases, the measuring device,
Since separate tanks are provided for each mixing device and pneumatic transportation device, three tanks are required, which not only makes the equipment large-scale and expensive, but also requires that these devices be linked together. Since it is assembled three-dimensionally in the vertical direction, its height is quite high, and there are problems such as taking up a large space for the equipment.

Therefore, the present invention was devised to solve the above problems, and its purpose is to make it possible to quantitatively measure, mix, and pneumatically transport powder and granules using a single mixing tank. That's true.

Therefore, the configuration of the present invention is such that a mixing tank equipped with mixing vanes is supported on a base so as to be movable up and down, a measuring device is provided between the tank and the base, and a powder is added to the top of the tank. A granule supply port is provided at the bottom, a discharge port is provided at the bottom, a supply damper and a discharge damper are provided at the supply port and the discharge port, respectively, and an air transport pipe is connected to the discharge port. Related to this, an air pump is provided to pneumatically transport the mixed powder and granules from the tank.

The mixing apparatus of the present invention will be explained below based on embodiments shown in the drawings.

Reference numeral 1 denotes a mixing tank for powder and granular material, which is provided with a supply port 11 for the powder and granular material in its upper part, and a discharge port 12 in its lower part. 13a,1
A supply damper 13 and a discharge damper 14 are provided which are opened and closed by the tank 1, and a powder mixing blade 15 is rotatably supported inside the tank 1, and the mixing blade 15 is provided at the bottom of the tank 1. It is intended to be driven by a motor 16.

Accordingly, in the present invention, the mixing tank 1 of the mixing apparatus configured as described above is supported on a base 2 so as to be movable up and down, and a measuring device 3 is provided between the tank 1 and the base 2, and 1 is connected to the air transport pipe 4, and in connection with the air transport pipe 4, an air pump 5 for pneumatically transporting the mixed powder and granules from the tank 1 is connected to the tank 1 through a communication pipe 51. It was established through the 41 and 52 are on-off valves.

As a means for making the mixing tank 1 vertically movable with respect to the base 2 and for measuring, a through hole 21 is provided in the center of the base 2, and a through hole 21 is provided in the lower part of the tank 1 in the through hole 21. A plurality of support cylinders 17 are provided at the lower part of the outer periphery of the tank 1, and the base 2
Air cylinders 22 are disposed at locations corresponding to the support cylinders 17, and these air cylinders 22
... are inserted into the support cylinder 17 ... through a measuring device 3 such as a loadzel, and these air cylinders 2
2... lifts the tank 1 above the base 2 to enable measurement by the measuring device 3;
By shortening these air cylinders 22, the tank 1 is placed on the base 2 via the support tubes 17. 41 and 52 are on-off valves for the air transport pipe 4 and the communication pipe 51.

Further, above the tank 1, hoppers 6, 6 for storing powder and granular materials of different materials are arranged as a pedestal 7, and below these hoppers 6, 6, a screw feeder or the like is quantified by the rotation speed. Feeding devices 61, 61 are provided, and a shutter 62 for guiding the powder to the supply port 11 of the tank 1 is provided below these feeding devices.

A boot 63 is interposed between the shutter 62 and the supply port 11, and a flexible material is used at least near the tank 1 of the air transport pipe 4 and the communication pipe 51 to prevent the tank 1 from moving up and down. At the same time, the load on the hopper 6, 6 side and the load on the air transport pipe 4 and communication pipe 51 side are prevented from being affected.

Further, 8 is a controller having a built-in memory circuit, a comparison circuit, an arithmetic circuit, an output circuit, etc., and the controller 8 includes a control device for the air cylinder 22, a metering device 3, and supply and discharge dampers 13, 1.
4 opening/closing devices 13a, 14a, feeding devices 61, 6
1, an opening/closing device for the on-off valves 41 and 52, a drive/stop device for the motor 16, and the air pump 5 are connected, respectively.

The mixing device of the present invention is constructed as described above, and when measuring, mixing, and transporting powder and granular materials made of different materials, by turning on the start switch of the controller 8, the air cylinder 22 is activated by a signal from the controller 8. ... extends and lifts the mixing tank 1 above the base 2, and the opening/closing device 1
3a operates to open the supply damper 13, and the feeding devices 61, 61 are further driven to supply the powder in each hopper 6, 6 to the tank 1 by rotation of the screw feeder 61a. When a certain amount is supplied, the weighing device 3 senses the weight, and at the same time, the controller 8
A stop signal is sent to the feeding devices 61, 61 to stop the supply of powder and granular material.

Next, the supply damper 13 is closed, the cylinders 22 are shortened, and the mixing tank 1 is placed on the base 1 via the support tube 17 by an output signal output from the controller 8, mainly from a timer. Then, the motor 16 is started to rotate the mixing blades 15, and the powder and granular material in the tank 1 is mixed for a certain period of time.

After detecting the end of this mixing mainly by a timer, with the mixing blade 15 still rotating,
The on-off valve 52 is opened by the output signal from the timer output from the controller 8, and the air pump 5
high-pressure air is sent from the tank 1 to pressurize the inside of the tank 1, and when the internal pressure reaches a predetermined pressure, the discharge damper 14 and the on-off valve 41 are opened to transfer the mixed powder from the tank 1 to the air transport pipe. 4 to a storage hopper of an extruder, for example.

In this transport machine, the motor 16 and the air pump 5 are activated by the output signal output from the controller 8 by the operation of the sensor that detects the end of the transport.
At the same time, the on-off valves 41 and 52 and the discharge damper 14 are closed.

In addition, although the pressurized air pump 5 was used as the air transport means in the previously described embodiments, the pump 5
Instead, a vacuum pump may be used.

In this case, it is preferable that the vacuum pump is not provided in the mixing tank 1, but is attached to the transport side end of the air transport pipe 4, for example, to a storage tank of an extruder via a filter.

As described above, the present invention supports a mixing tank equipped with mixing vanes internally on a base so as to be movable up and down, a measuring device is provided between the tank and the base, and a powder powder is placed on the top of the tank. A supply port and a discharge port are provided at the bottom of the body, and a supply damper and a discharge damper are provided at the supply port and the discharge port, respectively, and an air transport pipe is connected to the discharge port. Relatedly, since an air pump is provided to pneumatically transport the mixed powder and granular material from the tank, it is possible to quantitatively measure, mix, and pneumatically transport the powder and granular material using one mixing tank. This eliminates the need to separately provide a measuring tank for the measuring device, a transport tank for the pneumatic conveying device, etc. in addition to the mixing tank of the mixing device, and many conventional devices can be omitted. When performing mixing and transportation, the entire device can be configured extremely small, can be installed in a narrow space, and can be provided at low cost.

[Brief explanation of drawings]

The drawing is a partially cutaway front view showing an embodiment of the mixing device of the present invention. 1... Mixing tank, 11... Supply port, 12...
Discharge port, 13... Supply damper, 14... Discharge damper, 15... Mixing vane, 2... Base, 3... Metering device, 4... Air transport pipe, 5... Air pump.

Claims (1)

[Claims] 1. A mixing tank equipped with mixing vanes is supported on a base so that it can move up and down, and between the tank and the base,
In addition to providing a metering device, a supply port for powder and granular material is provided in the upper part of the tank, and a discharge port is provided in the lower part, and a supply damper and a discharge damper are respectively provided in the supply port and the discharge port, and air is supplied to the discharge port. 1. A mixing device for powder and granular material, characterized in that an air pump is connected to the transport pipe and is connected to the air transport pipe to pneumatically transport the mixed powder and granular material from the tank.