JP2001278433A - Feed screw of screw press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten volume density, to improve processing efficiency, and to reduce a carrying cost by diametrally minimizing a cavity of a pressed mass inevitably generated in a screw press. SOLUTION: This feed screw of the screw press 1 is composed of a cylindrical casing 3 having a discharge port 31 of a pressing object on the shaft directional one end side and having a supply port of the pressing object in a side part, the feed screw 4 for forming a screw blade 42 on an outer peripheral surface of a screw shaft 41 for rotating by a driving shaft along a shaft surface of the casing, and a constricted part 21t being continuously formed from the discharge port of the casing and having a tapered inside surface gradually diametrally contracted up to a prescribed opening diameter. The feed screw is disposed by extending the screw shaft up to the constricted part inside, and a gradually diametrally contracted tapered part 43 is formed in the tip vicinity. This taper angle is made to almost coincide with a taper angle of the tapered inside surface of the constricted part, and the screw blade is also formed on an outer peripheral surface of the tapered part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of screw presses for condensing and reducing the size of waste fibrous waste such as cutting waste, waste tying cords or filter plug wastes. The present invention relates to the structure of a feed screw as a component.

[0002]

2. Description of the Related Art At present, cutting waste such as paper products, fabrics and cardboards, waste binding straps after unpacking, or fiber waste such as filter plug waste has a low volume ratio and low transport efficiency if stored in a wrapper as it is. Due to the bad situation, compression and reduction in size are performed. In order to efficiently treat a large amount of fiber wastes, various types of mechanized presses have been used, and a major one is a screw press.

The conventional screw press 6 is described with reference to FIG. 4 showing a conventional example. A casing 3 having a substantially cylindrical shape and a predetermined length is inclined on a base frame 11 installed on a floor F. The upper end is an outlet 31. The outlet 31 is provided with a squeezed portion 61 in which a constricted portion 62 having a tapered inner surface whose diameter is gradually reduced to a predetermined opening diameter is continuously formed. A supply port 32 is formed in a side portion of the casing 3.
1 is provided with a hopper 12 for accumulating and supplying squeezed materials (eg, waste fibrous waste). Casing 3
A feed screw 5 for extruding and transporting the compressed object conforming to the inner surface shape is rotatably axially held therein. The feed screw 5 includes a screw shaft 51 supported in a cantilever structure along the axis of the casing 3 and a screw blade 52 formed on the outer peripheral surface of the screw shaft so as to extend spirally along the axis. The shaft is rotated by the driving force of a motor 13 disposed at one lower end of the casing 3.

[0004] The screw press 6 constructed as described above
Is to convey the compressed material supplied from the supply port 32 through the hopper 12 forward (discharge port side) by rotation of the feed screw 5, and
In the above, the pushing force by the screw blade 52 and the resistance force by the constricted portion 62 provided in the outlet 31 are combined,
As shown in FIG. 3 (A), the object to be pressed is compressed and agglomerated into a continuous columnar lump (hereinafter, this is referred to as “pressed lump”).
It becomes I and is sequentially discharged.

[0005] In this way, waste such as fiber waste is coagulated and reduced in size to reduce the volume, mounted on a transport vehicle such as a truck, and transported to the next processing facility.

[0006]

By the way, the compressed lump I which has been processed and discharged by the screw pressing machine 6 having the above structure is
The screw shaft 52 is compressed in the axial direction by the axial force of the screw blade 52 and the constricted portion 62, and the screw shaft 5 is compressed.
1 and the axial direction component of the constriction 62 is compressed in the cross-sectional direction. And the screw shaft 51
Has a cylindrical or columnar shape, the discharged squeezed mass I has a continuous columnar cavity H formed along the center of the axis, so to speak, has a bamboo ring shape. Due to the presence of the cavity H at the center of the axis, the volume density was reduced and the pressed mass I was bulky. For this reason, there is a problem that the carrying weight of the transport vehicle is reduced and the overall transport cost is increased.

[0007] As shown in the figure, the feed screw 5 is connected to the motor 1 at one end of the casing 3 (at the lower side).
3 must be connected to the drive shaft 3 and held in a cantilever structure.
1 had to be designed with a large diameter. Due to such structural necessity, the cavity H of the pressed mass I had to be large.

[0008]

Accordingly, the present invention has been made in view of the above-mentioned problems, and the volume density is increased by reducing the diameter of the cavity of the pressed mass, which is inevitably generated in the screw press, as much as possible. The purpose of the present invention is to provide a feed screw of a screw press for the purpose of improving processing efficiency and reducing transport costs.

[0009]

In order to achieve the above object, a cylindrical casing (1) having a discharge port (31) for compressed material on one end in the axial direction and a supply port for compressed material on a side portion. 3), a feed screw (4) formed by forming a screw blade (42) on the outer peripheral surface of a screw shaft (41) that rotates along a shaft of the casing (3) with a drive shaft, and the casing (3). ), Which is formed continuously from the discharge port (31) and has a tapered inner surface (21t) having a tapered inner surface gradually reduced in diameter to a predetermined opening diameter. According to the present invention, a feed screw is provided by extending a screw shaft (41) to the inside of the constricted portion (21t), and the tip of the screw shaft is gradually reduced in the vicinity of the tip of the screw shaft (41). The tapered portion obtained by (43)
Is formed.

Further, the taper angle of the tapered portion (43) is substantially equal to the taper angle of the tapered inner surface of the constricted portion (21t).
The screw blade (42) is formed up to the outer peripheral surface of 3).

The reference numerals in parentheses described in the claims and in the section of "Means for Solving the Problems" are attached with reference numerals in the drawings for easy understanding of the structure of the invention. Of course, it is not limited to the form on the drawing.

[0012]

With the above construction, the squeezed object taken in from the supply port is conveyed through the casing to the discharge port by the rotation of the feed screw. The conveyed squeezed object is pressed against the pushing force of the screw blade provided on the outer peripheral surface of the tapered portion and the axial length direction (direction along the axis) of the constricted portion in the tapered portion near the tip of the screw shaft. In addition to being compressed by the force, the constriction is gradually reduced in diameter along the taper of the tapered portion by the reaction force in the axial direction (center direction of the cross section) of the constriction. As a result, the hollow of the center axis of the squeezed mass at the time of discharge is hardly seen.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a feed screw according to the present invention applied to a screw press will be described in detail with reference to the drawings. FIG. 1 is a partial vertical cross-sectional view showing the entire screw press including the pressing unit mechanism of the present embodiment, and FIG. 2 is a partial vertical cross-sectional view showing the vicinity of the tip of a feed screw of the present embodiment. FIG. 3 is a comparison diagram of a cross-sectional shape of a pressed mass squeezed by the conventional device (A) and the device of the present embodiment (B).

First, in the following description, among the components of the screw press 6 shown as a conventional device in FIG. 4, the configurations of the base frame 11, the casing 3, the hopper 12, and the motor 13 will be described. Since the configuration is the same as that of the screw press 1 including the feed screw 4 according to the above, the same reference numerals are given to the drawings, and detailed description thereof will be omitted.

Therefore, in the following, the feed screw 4 according to the present invention disposed in the casing 3 and the constricted portion 21t will be described in detail.

At the discharge port 31 side of the casing 3, a pressing unit 2 is provided.
Is provided, and the squeezing section 2 is constituted by a sleeve 21. The sleeve 21 has a constricted portion 21t having a tapered inner surface gradually reduced in diameter to a predetermined opening diameter, and a straight tube portion 21 having a cylindrical inner surface continuous from the constricted portion 21t.
s. A predetermined height (approximately 1 to 2 mm in the example) along one or more locations (four locations in the circumferentially equal area in the example) of the tapered inner surface of the constricted portion 21t along the discharge direction (general line direction). Peak-like rib 21r of length, 2
1r,... The rib 21r prevents rotation of the compressed mass I generated on the tapered inner surface, thereby suppressing generation of frictional heat. In addition, at a plurality of locations on the inner peripheral surface of the straight pipe portion 21s (4
In the part), a resistance plate 22 as a resistance means protruding inside is provided.
Has been arranged. The resistance plate 22 is formed in a band shape by an elastic material such as spring steel or reinforced resin, and the tip side 22c is cantilevered in the axial direction and the discharge direction in the straight pipe portion 21s, and Mounting base 21b with its trunk side 22b inclined
And is fixed by two screws 22a, 22a. Accordingly, when a working force in the direction of the inner circumferential surface acts on the distal end side 22c held apart from the inner circumferential surface of the straight pipe portion, a repulsive force (a suppressing force on the squeezed object) acts thereon. Will do. The acting force in the direction of the inner peripheral surface affects the inclination angle of the resistance plate 22 extending obliquely into the straight pipe portion 21s, and the inclination angle is changed by sandwiching the washer or the like on the mounting table 21b. In addition, the pressing force on the squeezed object can be appropriately changed.

Further, the constricted portion 21t of the sleeve 21
The portion of the screw shaft 41 of the feed screw 4 located inside the tapered portion continuously and integrally (or integrally) forms a tapered portion 43 whose diameter gradually decreases toward the distal end. The taper angle of the tapered portion 43 is smaller than that of the narrowed portion 2.
You may make it substantially correspond to the taper angle of the inner peripheral surface of 1t. Further, the screw blade 42 attached to the screw shaft 41 is arranged so as to extend to the tapered portion 43. Note that it is more realistic to form the tapered portion 43 as a separate body and to integrate it than to form the same integrally with the screw shaft 41, and this embodiment also employs this method.

[0018]

According to the above-described structure, the squeezed material such as fiber waste taken in from the supply port 32 is conveyed toward the discharge port 31 by the action of the feed screw 4 as in the prior art. The conveyed squeezed object (fiber waste group) receives the movement resistance (hereinafter referred to as “discharge resistance”) due to the constricted portion 21t of the sleeve 21 and the resistance plate 22 as it approaches the discharge port 31. The compressed lumps I are gradually compressed by the pushing force of the opposed screw blades 42, become compressed lumps I, and are discharged through the straight pipe portion 21 s so as to push away the resistance plate 22.

At this time, the discharge resistance is formed by the constricted portion 21t and the resistance plate 22. The discharge resistance generated by the constricted portion 21t is fixedly determined by the setting of the taper angle, whereas the discharge resistance by the resistance plate 22 is determined. Is determined by the elastic force and the amount of extension of the resistance plate 22 and the set extension inclination angle. Therefore, the pressing force increases due to changes in the properties of the material to be pressed and the supply amount, and when the pressure exceeds a certain pressure, the resistance plate 22 is bent and pushed away.

In the tapered portion 43 near the distal end of the screw shaft 41, the pressing force of the screw blade 42 provided on the outer peripheral surface of the tapered portion 43 and the axial length of the constricted portion 21t are conveyed. In the direction (along the axis) and the constriction 21
The diameter gradually decreases along the taper of the tapered portion 43 due to the reaction force in the axial direction of t (the center of the cross section). As a result, almost no hollow on the axis of the pressed mass I at the time of discharge is observed.

[0021]

[Possibility of Other Embodiments] In the above embodiment,
The straight tube portion 21s is continuously arranged in front of the stenosis portion 21t, and the resistance means is arranged in the straight tube portion 21s.
Depending on the properties of the material to be pressed, the straight pipe portion 21s and the resistance means may be omitted. In addition, it is preferable to provide the screw blade 42 provided on the outer peripheral surface of the tapered portion 43, but the mounting position is appropriate, and it is possible to omit it when the taper angle is set large.

[0022]

According to the present invention having the above-described structure, it is possible to form a squeezed mass in which almost no hollow of the central shaft is seen, to increase the volume density, improve the processing efficiency, and reduce the transportation cost. be able to.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an entire screw press including a press section mechanism of the present embodiment.

FIG. 2 is a partial longitudinal sectional view showing the vicinity of the tip of a feed screw according to an embodiment of the present invention.

FIG. 3 is a comparison diagram of a cross-sectional shape of a pressed mass squeezed by the conventional device (A) and the device of the present embodiment (B).

FIG. 4 is a partial vertical sectional view showing the entire screw press of the conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw press (Example of this application) 11 Base frame 12 Hopper 13 Motor 2 Pressing part 21 Sleeve 21t Narrow part 21s Straight pipe part 21b Mounting stand 21r Rib 22 Resistance plate 22a Screw 22b Trunk side 22c Tip side 3 Casing 31 Discharge port 32 supply port 4 feed screw 41 screw shaft 42 screw blade 43 taper portion 5 feed screw (conventional device) 51 screw shaft (conventional device) 52 screw blade (conventional device) 6 screw pressing machine (conventional device) 61 pressing portion 62 constriction portion I crushed mass H cavity F floor

Claims (3)

[Claims] A squeezed material discharge port (31) at one end in the axial direction.
A cylindrical casing (3) having a supply port for a compressed object on a side portion thereof; and a screw on an outer peripheral surface of a screw shaft (41) that rotates along a shaft of the casing (3). A feed screw (4) having blades (42) formed therein; and a constriction portion formed continuously from a discharge port (31) of the casing (3) and having a tapered inner surface gradually reduced in diameter to a predetermined opening diameter. (21t), the feed screw (4) of the screw press (1) comprising the screw shaft (4) up to the inside of the constriction (21t).
A feed screw for a screw press, wherein 1) is extended and a tapered portion (43) whose diameter is gradually reduced toward the tip is formed near the tip of the screw shaft (41). 2. A feed screw for a screw press according to claim 1, wherein the taper angle of the tapered portion (43) is substantially equal to the taper angle of the tapered inner surface of the constricted portion (21t). 3. A screw blade (42) is formed up to an outer peripheral surface of a tapered portion (43).
Or a feed screw of the screw press according to 2 above.