JPH0243530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention forms a spiral protrusion on the inner wall of a rotating drum having an axis inclined with respect to the horizontal,
The present invention relates to a fluid circulation device used, for example, in a barrel polishing device or a drying device, in which a circulating flow is formed within the drum while stirring and mixing particulate matter contained in the drum.

This type of fluid circulation device, which has a spiral protrusion inside the rotating drum, is installed with its axis horizontally,
The stored material flows in one direction in the spiral feeding direction, causing bias at one end, and in order to obtain the desired mixing effect, a long drum is required depending on the required time. The granules move along the bottom of the drum and are biased towards the top, then descend along the axis according to the inclination of the axis and rise again from the bottom, creating a circular flow. Since the granules are circulated, the length of the drum can be shortened. Examples of devices that perform such fluid circulation include devices that have a configuration like a mixer in a concrete mixer truck, for example. In addition, as in the applicant's earlier patent application No. 25731 filed in 1973, two drums each having a spiral protrusion are arranged parallel to each other in a plan view and intersecting in an X shape in a side view. There is a barrel polishing device. The former occurs because there is no separation between the upward flow along the bottom surface of the granular material and the downward flow along the axis, which occur within the drum, so the boundary between the two flows gets mixed up and the granular material is affected by differences in particle size and specific gravity. Separation may occur and the intended circulating flow may not occur. On the other hand, in the latter, the granules move in one direction and circulate within the two drums, so
Although it is possible to generate a unidirectional circulating flow in an orderly manner and perform processing with uniform precision, it has the disadvantage that it occupies a large installation floor space and increases manufacturing costs because two drums are placed side by side.

The present invention provides a cylindrical drum that is rotatably suspended horizontally on a machine base with its axis inclined upwardly at an appropriate angle with respect to the horizontal, and has an appropriate interval between it and the inner wall of the drum. In addition to inserting the inner cylinder, a helical partition wall having both side edges fixed to the outer peripheral surface of the inner cylinder and the inner wall of the drum is provided to form a continuous spiral chamber along the inner wall of the drum. By providing upper and lower circulation ports that communicate with the cylinder, and attaching to this drum a drive device that rotates the granular material housed in the spiral chamber in the direction in which it rises in the same chamber and enters the inner cylinder from the upper end. As a result, the granules are neatly separated into an upward flow along the bottom of the drum and a downward flow along the axis of the drum in a single drum installed at an angle, allowing one-way circulation without mixing with each other. The present invention provides a fluid circulation device as described above.

An example in which the present invention is applied to a barrel polishing device will be described below.

In the figure, 1 is a cylindrical drum that is rotatably suspended horizontally on a machine base F with its axis tilted upward at an appropriate angle with respect to the horizontal, and 2 is a cylindrical drum with an appropriate distance between it and the inner wall of the drum 1. 3 is a helical partition wall that extends over the entire length of the inner surface of the drum 1 by fixing both side edges to the outer peripheral surface of the inner cylinder 2 and the inner wall of the drum 1. By providing a spiral chamber continuously formed along the inner wall of the drum, 5a is an upper circulation port that communicates the spiral chamber 4 and the inner cylinder 2 at the upper end, and 5b is a spiral chamber 4 facing the upper circulation port 5a. The lower circulation port 6, which communicates with the inner cylinder 2 at its lower end, is composed of an annular chain foil 6a fixed to the outer periphery of the drum 1, and a chain foil 6 fixed to the output shaft of a motor M installed on the machine base F and capable of forward and reverse rotation.
7 is a ring rail fixed to the front and back of the outer periphery of the drum 1, and 8 is a drive device that connects the lower surface of the ring rail 7 from the left and right on the machine base F, respectively. A trochanter 9 that rotatably supports the drum 1 feeds a granular mixture of abrasive material and abrasive material into a material input port 10 opened at the center of the upper end plate of the drum 1 and inner cylinder 2 which are stacked together. A supply gutter 11 is a discharge lid slidably provided along the outer peripheral surface of the drum 1 to open and close a discharge port 12 opened on the lower side of the drum 1; 13 is a discharge lid for discharging from the discharge port 12; This is the discharge gutter that receives the granules.

Reference numeral 14 denotes a sub-projection provided inside the spiral chamber 4 along the inner wall of the drum 1. The auxiliary protrusion 14 extends in the feeding direction of the helical partition wall 3 and has a downward slope with respect to the horizontal, contrary to the upward slope of the axis of the drum 1 which is inclined.
They are arranged at multiple locations within the pitch, each having a length of about 2/3 of the pitch.

In this fluid circulation device configured as described above, when the drive device 6 is operated and granules containing abrasive material and abrasive material are supplied from the material input port 10, they roll in the rotating inner cylinder 2. The mixture descends as a mixture and enters the lower end of the spiral chamber 4 through the lower circulation port 5b, and at the same time, due to the feeding action of the spiral partition wall 3 and the sub-projection 14 that rotate together with the drum 1, the mixture is tilted upward. The liquid then rises sequentially while rolling along the bottom surface of the drum 1, enters the inner cylinder 2 again through the upper circulation port 5a, and flows down.

As described above, the inner cylinder 2 is inserted into the drum 1 that rotates with an upward slope, the spiral partition wall 3 is provided between the drum 1 and the inner cylinder 2, and the spiral chamber 4 is continuous along the inner wall of the drum. and an inner cylinder 2 at both ends.
According to the present invention, in which upper and lower circulation ports 5a and 5b are provided which communicate with the drum, and a sub-projection 14 is provided between the spiral partition walls 3 along the inner wall of the drum, the drum that rotates while accommodating the granular material is in one tank. However, the movement of the granules that occurs inside the drum is continuous only at the top and bottom of the drum, as the upward flow that rises in one direction along the bottom of the drum and the downward flow that descends inside the inner cylinder are blocked by the inner cylinder. Since it produces an orderly and complete one-way circulation flow, it does not produce mixed flows unlike conventional mixer types, and it is possible to suppress unnecessary collisions between granules during operation as much as possible. In addition, since there is no need to place two tanks side by side to create a one-way circulating flow within the drum, the installation floor space can be reduced, and
It has the advantage of being inexpensive to manufacture. Further, by providing a sub-projection along the inner wall of the drum, the contained granules can be completely circulated to a very small amount and can be discharged to the end, allowing use without creating any residual amount.

It should be noted that if the drum 1 of the illustrated embodiment is made of a perforated plate with ventilation, and the outside of the drum 1 is surrounded by a fixed cover having an air pipe and an exhaust hole to supply hot air, the present invention can be realized. The invention can also be used as a drying device for granular materials such as grains.

[Brief explanation of the drawing]

The drawing schematically shows an embodiment of the invention,
FIG. 1 is a partially cutaway side view thereof, FIG. 2 is a cross-sectional view of the vicinity of the upper circulation port with the sub-projections omitted, and FIG. 3 is a cross-sectional view of the vicinity of the lower circulation port. 1...Drum, 2...Inner cylinder, 3...Spiral partition, 4...Spiral chamber, 5a, 5b...Circulation port, 6
... Drive device, M ... Motor, 6a, 6b ... Chain wheel, 7 ... Ring rail, 8 ... Trochanter,
F... Machine base, 9... Supply gutter, 10... Material inlet, 11... Discharge lid, 12... Discharge port, 13...
...Discharge gutter, 14...Sub-projection.

Claims (1)

[Scope of Claims] 1. A cylindrical drum that is rotatably suspended horizontally on a machine base with its axis inclined at an upward slope at an appropriate angle with respect to the horizontal, with an appropriate interval between it and the inner wall of the drum. At the same time, a helical partition wall having both side edges fixed to the outer peripheral surface of the inner cylinder and the inner wall of the drum is provided to form a continuous helical chamber along the inner wall of the drum. Upper and lower circulation ports are provided that communicate with the inner cylinder, respectively, and a drive device is attached to the drum to rotate the granular material housed in the spiral chamber in a direction in which the particles rise within the same chamber and enter the inner cylinder from the upper end. A fluid circulation device characterized by: 2. Claim No. 2, characterized in that a sub-projection extending in the feeding direction of the helical partition wall and having a downward slope with respect to the horizontal is arranged on the inner wall of the drum forming the helical chamber. The fluid circulation device according to item 1.