Sieve

Abstract

To provide a sieve capable of preventing loss of a vibration exciter for eliminating clogging while achieving weight reduction.SOLUTION: A sieve has an inner frame and an outer frame, and the inner frame includes a frame member constituted of a hollow pipe, a sieve net stretched on the frame member, and a vibrator built in the hollow pipe constituting the frame member and vibrating the frame member.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sieve having a vibrating function.

Background Art

[0002] In the process of grinding wheat into flour in a flour mill (grinding process), the processes of crushing wheat and various granular wheat stocks (semi-finished wheat products during grinding) with rolls, sieving with a sieve, and purifying with a purifier are repeated. As a result, the wheat stocks are separated into white flour and bran. Since sieves are installed for each of the above processes, the number of sieves can reach 1000 in the grinding process. Thus, sieves are very important equipment, and various improvements have been made so far.

[0003] The sieve frame of the sieve used in a flour mill consists of an outer frame and a middle frame. A sieve cloth (sieve silk) which is a sieve mesh is stretched on the upper surface of the middle frame, and the wheat particles that have passed through the sieve cloth are collected on the upper surface of the outer frame. In addition to the sieve cloth attached to the upper part of the middle frame, a coarse mesh such as a crimped net is stretched on the lower part of the middle frame, and members called a cleaner, a tapping ball, etc. are enclosed as vibrators in the space between the sieve cloth and the crimped net to eliminate clogging of the sieve cloth. This member prevents the sieve cloth from clogging by colliding with the sieve cloth every time the sieve vibrates (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The powder manufacturing plant operates 24 hours a day, and from the viewpoints of energy saving and maintenance, it is desirable that the sieve frame of the sieve be lightweight. Examples of the material of the sieve frame include wood and metal (for example, aluminum). Although the metallic sieve frame has high strength, it tends to be heavy. Therefore, consideration is being given to removing a coarse mesh such as a crimped mesh stretched below the middle frame that does not function as a sieve to reduce the weight. However, when the crimped mesh is removed, the vibrator cannot be enclosed in the middle frame, and there is a risk of loss of the member or its mixing into the product.

[0006] An object of the present invention is to provide a sieve that can prevent loss of a vibrator that eliminates clogging while achieving weight reduction.

Means for Solving the Problems

[0007] The sieve of the present invention is a sieve having a middle frame and an outer frame, wherein the middle frame includes a frame member constituted by a hollow pipe, a sieve mesh stretched on the frame member, and a vibrator built in the hollow pipe constituting the frame member for vibrating the frame member.

[0008] Further, the sieve of the present invention is characterized in that the frame member is made of an aluminum square pipe. Further, the sieve of the present invention has a plurality of outer frame bodies that constitute the outer side of the middle frame and a plurality of reinforcing bodies that are arranged inside the outer frame bodies and reinforce the outer frame bodies, and the vibrator is built in each of the outer frame bodies and the reinforcing bodies. Further, the sieve of the present invention is characterized in that the vibrator is spherical or chain-shaped.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a sieve that can prevent loss of a vibrator that eliminates clogging while achieving weight reduction.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0011] Hereinafter, a sieve according to an embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a sieve according to an embodiment, and FIG. 2 is a developed perspective view. The sieve 2 according to this embodiment is a sieve for sieving powders such as wheat stock into coarse powder and fine powder. As shown in FIGS. 1 and 2, it includes a middle frame 4 and an outer frame 6.

[0012] The middle frame 4 is rectangular and includes a frame member 8 made of a hollow pipe and a sieve cloth 10 which is a sieve mesh stretched over the upper part of the frame member 8. Note that, unlike a conventional middle frame, the middle frame 4 does not have a crimp net stretched over the lower part of the frame member 8. FIG. 3 is a cross-sectional plan view showing the configuration of the frame member 8 of the middle frame 4. The frame member 8 is made of an aluminum square pipe and has four outer frame bodies 8a to 8d that constitute the outer sides of the middle frame 4 as shown in FIGS. 2 and 3. The outer frame bodies 8a and 8b are square tubes with both ends closed, with the longitudinal direction oriented in the left-right direction of the paper surface in FIG. 4. The outer frame body 8a is located at the upper part of the paper surface, and the outer frame body 8b is located at the lower part of the paper surface. The outer frame bodies 8c and 8d are square tubes with both ends closed, with the longitudinal direction oriented in the up-down direction of the paper surface in FIG. 3. The outer frame body 8c is located at the left part of the paper surface, and the outer frame body 8d is located at the right part of the paper surface. One end of the outer frame body 8c is connected to one end of the outer frame body 8a, and the other end is connected to one end of the outer frame body 8b. By being connected, both ends of the outer frame body 8c are closed. Similarly, one end of the outer frame body 8d is connected to the other end of the outer frame body 8a, and the other end is connected to the other end of the outer frame body 8b. By being connected, both ends of the outer frame body 8d are closed.

[0013] Further, as shown in FIG. 3, the frame member 8 is located within a rectangular frame composed of outer frame bodies 8a to 8d and has five reinforcing members 8e to 8i that reinforce the outer frame bodies 8a to 8d. The reinforcing member 8e is a square tube with both ends closed, with its longitudinal direction oriented in the left - right direction of the paper surface of FIG. 3, and is located between the outer frame bodies 8a and 8b. One end of the reinforcing member 8e is connected to the central portion of the outer frame body 8c, and the other end is connected to the central portion of the outer frame body 8d. By being connected, both ends of the reinforcing member 8e are closed. The reinforcing members 8f to 8i are square tubes with both ends closed, with their longitudinal directions oriented in the up - down direction of the paper surface of FIG. 3. The reinforcing members 8f and 8g are located within a rectangular frame composed of the outer frame bodies 8a, 8c, 8d and the reinforcing member 8e, and the reinforcing members 8h and 8i are located within a rectangular frame composed of the outer frame bodies 8b, 8c, 8d and the reinforcing member 8e. The reinforcing member 8f is on the side of the outer frame body 8c, the reinforcing member 8g is on the side of the outer frame body 8d. One end is connected to the outer frame body 8a, and the other end is connected to the reinforcing member 8e. By being connected, both ends of the reinforcing members 8f and 8g are closed. The reinforcing member 8h is on the side of the outer frame body 8c, the reinforcing member 8i is on the side of the outer frame body 8d. One end is connected to the reinforcing member 8e, and the other end is connected to the outer frame body 8b. By being connected, both ends of the reinforcing members 8h and 8i are closed.

[0014] Moreover, the middle frame 4 includes vibration elements 12a to 12i that are built into the hollow pipes forming the frame member 8 and vibrate the frame member 8. As shown in FIG. 3, the vibration elements 12a to 12i are spherical with a diameter smaller than the width and height of the inner space of the frame member 8. By vibrating the frame member 8, the vibration elements 12a to 12i vibrate the sieve mesh 10 stretched on the frame member 8 to prevent clogging of the sieve mesh 10. The vibration element 12a moves freely in all directions within the hollow pipe forming the outer frame body 8a and vibrates the outer frame body 8a by repeatedly colliding with the inner wall surface of the outer frame body 8a.

[0015] Similarly, the vibrator 12b moves freely in all directions within the hollow pipe forming the outer frame body 8b and repeatedly collides with the inner wall surface of the outer frame body 8b to vibrate the outer frame body 8b. The vibrator 12c moves freely in all directions within the hollow pipe forming the outer frame body 8c and repeatedly collides with the inner wall surface of the outer frame body 8c to vibrate the outer frame body 8c. The vibrator 12d moves freely in all directions within the hollow pipe forming the outer frame body 8d and repeatedly collides with the inner wall surface of the outer frame body 8d to vibrate the outer frame body 8d. The vibrator 12e moves freely in all directions within the hollow pipe forming the reinforcing body 8e and repeatedly collides with the inner wall surface of the reinforcing body 8e to vibrate the reinforcing body 8e. The vibrator 12f moves freely in all directions within the hollow pipe forming the reinforcing body 8f and repeatedly collides with the inner wall surface of the reinforcing body 8f to vibrate the reinforcing body 8f. The vibrator 12g moves freely in all directions within the hollow pipe forming the reinforcing body 8g and repeatedly collides with the inner wall surface of the reinforcing body 8g to vibrate the reinforcing body 8g. The vibrator 12h moves freely in all directions within the hollow pipe forming the reinforcing body 8h and repeatedly collides with the inner wall surface of the reinforcing body 8h to vibrate the reinforcing body 8h. The vibrator 12i moves freely in all directions within the hollow pipe forming the reinforcing body 8i and repeatedly collides with the inner wall surface of the reinforcing body 8i to vibrate the reinforcing body 8i.

[0016] As shown in FIGS. 1 and 2, the outer frame 6 is formed by outer walls 16a to 16d and the fine powder receiving plate 18. The outer frame 6 has inner walls 20a to 20c, and the middle frame 4 is fitted into the region formed by the outer wall 16d and the inner walls 20a to 20c of the outer frame 6. Further, a slit-shaped discharge port 24a is provided in the inner wall 20a, and a slit-shaped discharge port 24b is provided in the inner wall 20b. An opening 26a is provided between the outer wall 16a and the inner wall 20a, and an opening 26b is provided between the outer wall 16b and the inner wall 20b. The fine powder sieved onto the fine powder receiving plate 18 by the sieve mesh 10 of the middle frame 4 falls from the openings 26a and 26b through the discharge ports 24a and 24b and is collected. Further, the outer frame 6 has an opening 28 between the outer wall 16c and the inner wall 20c. The coarse powder that has not passed through the sieve mesh 10 of the middle frame 4 falls from the opening 28 and is collected.

[0017] According to the sieve 2 according to this embodiment, it is possible to prevent the loss of the vibrators 12a to 12i that eliminate clogging while achieving weight reduction. That is, different from the conventional sieve, the sieve 2 according to this embodiment does not have a crimped net in the middle frame 4, so the weight of the crimped net can be reduced and the weight can be reduced. Further, in the case of a conventional sieve, a vibrator is enclosed between the sieve cloth and the crimped net. However, since the sieve 2 does not have a crimped net, the vibrator cannot be enclosed between the sieve cloth and the crimped net. When the vibrator is housed between the sieve cloth and the upper surface of the outer frame, there is a risk of losing the vibrator when the middle frame is removed from the outer frame during maintenance or the like. However, according to the sieve 2 according to this embodiment, since the vibrators 12a to 12i are built in the hollow pipes constituting the frame member 8, there is no risk of loss.

[0018] In the sieve 2 according to the above-described embodiment, the case where the middle frame 4 includes the spherical vibrators 12a to 12i has been described as an example. However, instead of the spherical vibrators 12a to 12i, chain-shaped vibrators may be provided. FIG. 4 is a cross-sectional plan view showing the configuration of the chain-shaped vibrators 14a and 14f incorporated in the hollow pipes constituting the outer frame body 8a and the reinforcing body 8f of the frame member 8 of the middle frame 4. One end of the vibrator 14a is fixed to one end of the outer frame body 8a, and the other end is fixed to the other end of the outer frame body 8a. The vibrator 14a vibrates within the hollow pipe constituting the outer frame body 8a to vibrate the outer frame body 8a. Similarly, one end of the vibrator 14f is fixed to one end of the reinforcing body 8f, and the other end is fixed to the other end of the reinforcing body 8f. The vibrator 14f vibrates within the hollow pipe constituting the reinforcing body 8f to vibrate the reinforcing body 8f. Although not shown, the hollow pipes constituting the outer frame bodies 8b to 8d and the reinforcing bodies 8e, 8g to 8i also contain chain-shaped vibrators similar to the vibrators 14a and 14f, similar to the outer frame body 8a and the reinforcing body 8f. Further, one end of each of the vibrators (not shown) is fixed to one end of each of the outer frame bodies 8b to 8d and the reinforcing bodies 8e, 8g to 8i, and the other ends are fixed to the other ends of each of the outer frame bodies 8b to 8d and the reinforcing bodies 8e, 8g to 8i. Each of the vibrators vibrates within the hollow pipes constituting each of the outer frame bodies 8b to 8d and the reinforcing bodies 8e, 8g to 8i to vibrate each of the outer frame bodies 8b to 8d and the reinforcing bodies 8e, 8g to 8i. Note that the vibrators 14a and 14f shown in FIG. 4 are link chains, but it goes without saying that chains other than link chains (such as ball chains) may be employed as the chain-shaped vibrators.

Explanation of Reference Numerals

[0019] 2... sieve, 4... middle frame, 6... outer frame, 8... frame member, 8a to 8d... outer frame bodies, 8e to 8i... reinforcing bodies, 10... sieve cloth, 12a to 12i, 14a, 14f... vibrators, 16a to 16d... outer walls, 18... fine powder receiving plate, 20a to 20c... inner walls, 24a, 24b... discharge ports, 26a, 26b, 28... openings.

Claims

1. A sieve having a middle frame and an outer frame, wherein the middle frame comprises a frame member formed by a hollow pipe, a sieve mesh stretched over the frame member, and a vibrator built into the hollow pipe constituting the frame member for vibrating the frame member characterized in that it is provided with the vibrator.

2. The sieve according to claim 1, characterized in that the frame member is made of an aluminum square pipe.

3. The frame member comprises a plurality of outer frame bodies constituting the outer sides of the middle frame, and a plurality of reinforcing bodies arranged inside the outer frame bodies for reinforcing the outer frame bodies, wherein the vibrator is built into each of the outer frame bodies and the reinforcing bodies, characterized in that the sieve according to claim 1 or claim 2.

4. The sieve according to claim 1 or claim 2, characterized in that the vibrator is spherical.

5. The sieve according to claim 1 or claim 2, characterized in that the vibrator is chain-shaped.

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