Vibratory sieving device and vibratory sieving method

Abstract

To provide a vibratory sieving device and a vibratory sieving method capable of stably improving processing capacity during sieving of powder.SOLUTION: A vibratory sieving device 100 comprises: an upper housing 10 surrounded by a peripheral wall 10a; a sieve mesh 11 provided inside the upper housing 10; a vibration mechanism 30 that imparts vibration to the upper housing 10; and a supply section 40 that supplies powder P to above the sieve mesh 11 through an inner cylinder. The inner cylinder can be filled with powder at least at a lower end portion thereof when the supply section 40 supplies the powder P to above the sieve mesh 11. A distance D from the sieve mesh 11 to a supply port 47b formed at the lower end portion of the inner cylinder is smaller than a height H from the sieve mesh 11 to an upper end portion of the peripheral wall 10a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibrating sieve device and a vibrating sieve method used for classifying and separating powders. [Background technology]

[0002] BACKGROUND ART Conventionally, a vibrating sieve device is known that is configured to sieve powder placed inside a sieve frame by applying vibration to the sieve frame on which a sieve mesh is provided (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-174495 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vibrating sieving device according to the conventional technology, there is a need for a configuration that suppresses variations in processing capacity when sieving powder. The present invention has been made in view of the above circumstances, and the problem that the present invention aims to solve is to provide a vibrating sieving device and a vibrating sieving method that can stably improve processing capacity when sieving powder. [Means for solving the problem]

[0005] Below, we will explain means for solving the above problems.

[0006] The vibrating screen device of the present invention comprises a housing surrounded by a peripheral wall, a sieve screen provided inside the housing, a vibration mechanism that imparts vibrations to the housing, and a supply unit that supplies powder above the sieve screen through an inner tube, wherein the inner tube is capable of being filled with powder at least at its lower end when the supply unit supplies powder above the sieve screen, and the distance from the sieve screen to a supply port formed at the lower end of the inner tube is formed to be shorter than the height from the sieve screen to the upper end of the peripheral wall.

[0007] In the vibrating screen device, it is preferable that the distance from the sieve screen to the supply port of the inner cylinder is adjustable.

[0008] Furthermore, in the vibrating screen device, it is preferable that the supply unit includes a speed adjustment unit that adjusts the speed at which powder is introduced into the inner cylinder, the inner cylinder is provided with a first sensor that detects the presence or absence of powder, and when the first sensor does not detect the powder, the speed adjustment unit increases the powder introduction speed.

[0009] In addition, in the vibrating screen device, it is preferable that a second sensor for detecting the presence or absence of powder is provided above the first sensor in the inner cylinder, and when the second sensor detects the powder, the speed adjustment unit reduces the powder feeding speed.

[0010] In addition, the vibrating screening method of the present invention is a vibrating screening method performed by a vibrating screening device comprising a housing, a sieve mesh provided inside the housing, a vibration mechanism that imparts vibrations to the housing, and a supply unit that supplies powder above the sieve mesh through an inner tube, wherein the supply unit supplies powder above the sieve mesh with the powder filled at least in the lower end of the inner tube.

[0011] Furthermore, in the vibrating screening method, it is preferable that the supply unit includes a speed adjustment unit that adjusts the speed at which powder is introduced into the inner cylinder, the inner cylinder is provided with a first sensor that detects the presence or absence of powder, and when the first sensor does not detect the powder, the speed adjustment unit increases the powder introduction speed.

[0012] In addition, in the vibrating screening method, it is preferable that a second sensor for detecting the presence or absence of powder is provided above the first sensor in the inner cylinder, and when the second sensor detects the powder, the speed adjustment unit reduces the powder feeding speed. [Effects of the Invention]

[0013] According to the vibrating sieve device and vibrating sieve method of the present invention, it is possible to stably improve the processing capacity when sieving powder. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an overall configuration diagram showing a vibrating screen device according to an embodiment; [Figure 2] FIG. [Figure 3] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] A vibrating sieving device 100 according to one embodiment of the present invention will be described with reference to the accompanying drawings. As shown in Figures 1 and 2, the vibrating sieving device 100 according to this embodiment is a device for sieving powder P, and includes a sieving unit 1, a supply unit 40, a control device 50, etc. as its main components. Each component will be described below in order.

[0016] The sieving unit 1 is composed of a storage unit 2 placed on the floor, a compression spring 3, a support plate 4, a lid 5, an upper housing 10 and a lower housing 20 which are hollow cylindrical bodies that store the powder P before and after sieving, and a vibration mechanism 30. The storage unit 2 is a hollow box body, and is supported on the floor by legs 2a equipped with casters. Note that the bottom plate of the storage unit 2 may be placed directly on the floor without using the legs 2a. The vibration mechanism 30 is housed inside the storage unit 2.

[0017] A support plate 4 is supported on the upper surface of the accommodation section 2 via a plurality of (eight in this embodiment) compression springs 3. A vibration mechanism 30 is attached to the support plate 4, and vibrations generated by driving the vibration mechanism 30 are transmitted to the support plate 4. An upper housing 10 and a lower housing 20, each of which has a hollow cylindrical shape with open top and bottom, are stacked one on top of the other and attached to the upper surface of the support plate 4.

[0018] The upper housing 10 is surrounded by a peripheral wall 10a, and the upper opening is closed by a lid 5. An opening 5a is formed in the center of the lid 5, for introducing powder P from a supply unit 40 into the upper housing 10. The lid 5 and the upper housing 10, the upper housing 10 and the lower housing 20, and the lower housing 20 and the support plate 4 are fastened to each other at their outer circumferential surfaces by fastening members 16. Note that, although the upper housing 10 and the lid 5 are formed as separate members in this embodiment, the lid may be formed integrally with the upper housing 10.

[0019] As shown in Fig. 3, a disk-shaped tray 12 is provided between the upper housing 10 and the lower housing 20. In other words, the upper housing 10 and the lower housing 20 are connected to each other with the periphery of the tray 12 sandwiched between them. As shown in Fig. 3, the tray 12 is formed in a disk shape and has a plurality of through-holes 13 that penetrate vertically. In addition, a plurality of spheres 14 are arranged on the upper surface of the tray 12.

[0020] As shown in Figure 3, an annular retaining plate 10b is fixed to the inner peripheral surface of the upper housing 10. An annular elastic member 15 is disposed on the outer peripheral edge of the receiving tray 12. A disk-shaped sieve screen 11 is sandwiched between the elastic member 15 and the retaining plate 10b inside the upper housing 10. A first discharge pipe 17, formed above the receiving tray 12, is fixed to the peripheral wall 10a of the upper housing 10.

[0021] In the sieve section 1, the spheres 14 arranged on the upper surface of the tray 12 receive vibrations from a vibration mechanism 30 (described later) and vibrate up and down so as to strike the sieve mesh 11 from below. The striking effect of the spheres 14 prevents clogging of the sieve mesh 11.

[0022] A conical umbrella member 21 is fixed to the inner peripheral surface of the lower housing 20 to cause the powder P to flow outward. A second discharge pipe 22 is fixed to the outer peripheral surface of the lower housing 20 so as to contact the upper surface of the umbrella member 21. Note that it is also possible to provide an inclined plate inclined toward the second discharge pipe 22 instead of the umbrella member 21, thereby increasing the discharge capacity.

[0023] The vibration mechanism 30 is composed of a drive motor 31 having output shafts extending in the vertical direction, a lower weight 32 connected to the lower output shaft, and an upper weight 33 connected to the upper output shaft. The drive motor 31 is fixed to the lower surface of the support plate 4, with the upper output shaft and upper weight 33 inserted into the lower housing 20 through an opening formed in the center of the support plate 4. The lower weight 32 and upper weight 33 are positioned so that their centers of gravity are eccentrically positioned radially outward from the center of the output shaft.

[0024] In the sieve unit 1, when the drive motor 31 is rotated, the lower weight 32 and the upper weight 33 connected to the respective output shafts rotate. At this time, the drive motor 31 vibrates because the centers of gravity of the lower weight 32 and the upper weight 33 are eccentric toward the outside diameter from the center of rotation, and this vibration is transmitted to the support plate 4. Furthermore, the vibration is transmitted to the upper housing 10 and the lower housing 20 connected to the support plate 4 via the compression spring 3. In this way, the vibration mechanism 30 has the function of applying vibration to the upper housing 10 and the lower housing 20.

[0025] In the sieve unit 1, while the upper housing 10 and the lower housing 20 are vibrating, the powder P to be treated is fed from the supply unit 40 into the upper housing 10 through an opening 5a formed in the center of the lid 5. Then, the powder P fed into the upper housing 10 falls onto the sieve mesh 11 inside the upper housing 10.

[0026] The powder P is sieved into particles having a particle size larger than the mesh size of the sieve mesh 11 and particles having a particle size smaller than the mesh size. Particles having a particle size larger than the mesh size of the sieve mesh 11 move radially outward on the sieve mesh 11 and are discharged to the outside through the first discharge pipe 17. Particles having a particle size smaller than the mesh size of the sieve mesh 11 pass through the sieve mesh 11 and fall onto the receiving tray 12 below.

[0027] The powder with a small particle size that falls onto the tray 12 passes through the through holes 13 formed in the tray 12 and falls onto the umbrella member 21 below, flows radially outward on the upper surface of the umbrella member 21, and is discharged to the outside through the second discharge pipe 22. In this way, the sieve unit 1 can classify the powder P into two types of particle sizes: large and small.

[0028] 1, the vibrating screen device 100 is configured to include a supply unit 40. The supply unit 40 is configured with a support table 41, support columns 42, a hopper 43, an electromagnetic feeder 44, a trough 45, an upper inner cylinder 46, a lower inner cylinder 47, etc.

[0029] Support base 41 supports hopper 43 via support columns 42. An electromagnetic feeder 44 is placed on the upper surface of support base 41. Hopper 43 contains powder P therein to be sieved by sieving unit 1. A discharge outlet 43a is formed at the bottom of hopper 43, and powder P is discharged from discharge outlet 43a.

[0030] The powder P discharged from the discharge port 43a falls into the inside of a trough 45 provided at the top of the electromagnetic feeder 44. The electromagnetic feeder 44 vibrates the trough 45, which is formed in the shape of a hollow groove, using an electromagnet as a driving source. As a result, the electromagnetic feeder 44 transports the powder P that has fallen into the inside of the trough 45 to the tip side of the trough 45 (the left side in FIG. 1).

[0031] Inner cylinders (upper inner cylinder 46 and lower inner cylinder 47) that communicate with the interior of trough 45 hang down from the tip of trough 45 via flexible chute 49. The upper end of upper inner cylinder 46 is fixed to the tip of trough 45. As shown in FIG. 3, the lower end of the inner cylinder (the lower end of lower inner cylinder 47) is inserted into the interior of upper housing 10 through opening 5a of lid 5.

[0032] The powder P transported by the trough 45 is introduced into the upper housing 10 via the inner cylinder. In this manner, the supply unit 40 supplies the powder P via the inner cylinder to above the sieve screen 11 inside the upper housing 10. At this time, the lower end of the lower inner cylinder 47 functions as a supply port 47b for the powder P.

[0033] In the vibrating sieve device 100 according to this embodiment, the electromagnetic feeder 44 is electrically connected to the control device 50, and can adjust the conveying speed of the powder P (vibration speed of the trough 45) based on a signal from the control device 50. That is, the electromagnetic feeder 44 according to this embodiment functions as a speed adjusting unit that adjusts the charging speed of the powder P into the inner cylinder.

[0034] The upper part of the lower inner cylinder 47 is assembled to the lower part of the upper inner cylinder 46 so as to be slidable in the longitudinal direction (up and down direction). Specifically, as shown in Fig. 3, the lower inner cylinder 47 has an elongated hole 47a opened along the longitudinal direction, and a fixing screw 48 is threaded into the upper inner cylinder 46 through this elongated hole 47a. This allows the vertical position of the lower inner cylinder 47 to be changed relative to the upper inner cylinder 46, making it possible to adjust the distance D (see Fig. 3) from the sieve screen 11 to the supply port 47b.

[0035] 3, the distance from the sieve mesh 11 to the supply port 47b of the inner cylinder is set to be smaller than the height H (see FIG. 3) from the sieve mesh 11 to the upper end of the peripheral wall 10a. In other words, the supply port 47b of the inner cylinder is disposed in the inner space surrounded by the peripheral wall 10a of the upper housing 10.

[0036] In the vibrating sieve device 100 according to this embodiment, the inner cylinders (upper inner cylinder 46 and lower inner cylinder 47) are capable of being filled with powder P at least at their lower ends when the supply unit 40 supplies powder P above the sieve screen 11. In other words, according to the vibrating sieve method performed by the vibrating sieve device 100, the supply unit 40 supplies powder P above the sieve screen 11 in a state where at least the lower ends of the inner cylinders are filled with powder P. As a result, the mesh top layer height of powder P above the sieve screen 11 (the thickness of powder P located above the sieve screen 11) is kept constant at a size close to the distance D as shown in FIG.

[0037] In the vibrating sieving device 100, the processing capacity when sieving powder P is determined by the layer height of powder P on the screen. That is, by making the layer height of powder on the screen of the sieve constant, it is possible to improve the processing capacity of the vibrating sieving device. In the vibrating sieving device 100 according to this embodiment, the influence of variations in supply capacity is eliminated and the layer height of powder P on the screen can be kept constant at a size close to the distance D from the sieve screen 11 to the supply port 47b, so it is possible to stably improve the processing capacity of sieving. In other words, in the vibrating sieving device 100, it is possible to maximize the capacity of the sieving unit 1 (to perform sieving at a level close to the maximum sieving capacity of the sieving unit 1).

[0038] Furthermore, in the vibrating sieve device 100, the distance D from the sieve screen 11 to the supply port 47b can be adjusted, thereby changing the processing capacity when sieving the powder P. In other words, by adjusting the distance D by changing the vertical position of the lower inner cylinder 47 relative to the upper inner cylinder 46, the processing capacity of the vibrating sieve device 100 can be adjusted.

[0039] In the vibrating sieve device 100 according to this embodiment, the supply unit 40 that supplies the powder P to the sieve unit 1 is configured to include a hopper 43 and an electromagnetic feeder 44, but it is also possible to configure the hopper 43 to be located directly above the sieve unit 1. In this case, an inner cylinder extending downward from the hopper 43 is inserted into the upper housing 10. Furthermore, the supply unit 40 can also be configured to include other supply devices such as a rotary valve, a screw feeder, or a table feeder instead of the electromagnetic feeder 44.

[0040] 3, a first sensor 51 is provided in the lower inner cylinder 47 of the vibrating sieve device 100 to detect the presence or absence of powder P filled inside the lower inner cylinder 47. The first sensor 51 is electrically connected to the control device 50.

[0041] Then, in the vibrating sieve device 100, when the first sensor 51 does not detect the powder P (when the height of the filled powder P is lower than the position of the first sensor 51), the speed at which the electromagnetic feeder 44 feeds the powder P is adjusted to be faster via the control device 50. In this way, according to the vibrating sieve method performed by the vibrating sieve device 100, the amount of powder P fed into the inner cylinder can be increased, so that the state in which the powder P is filled at the lower end of the inner cylinder can be maintained.

[0042] 3, a second sensor 52 is provided in the upper inner cylinder 46 (above the first sensor 51) of the vibrating sieve device 100 to detect the presence or absence of powder P filled inside the upper inner cylinder 44. The second sensor 52 is electrically connected to the control device 50.

[0043] Then, in the vibrating sieve device 100, when the second sensor 52 detects the powder P (when the height of the filled powder P is higher than the position of the second sensor 52), the speed at which the electromagnetic feeder 44 feeds the powder P is adjusted to be slower via the control device 50. In this way, according to the vibrating sieve method performed by the vibrating sieve device 100, the amount of powder P fed into the inner cylinder can be reduced, and therefore, it is possible to prevent the inner cylinder from being filled with more powder P than necessary.

[0044] As described above, the vibrating sieve device 100 according to this embodiment makes it possible to appropriately maintain the filling height of the powder P in the inner cylinder by detecting the presence or absence of the powder P filled inside the inner cylinder using the first sensor 51 and the second sensor 52. In other words, by keeping the filling height of the powder P in the inner cylinder within a predetermined range, it becomes possible to appropriately sift the powder P in the vibrating sieve device 100 (preventing the inner cylinder from becoming empty or the powder P from overflowing from the inner cylinder). [Explanation of symbols]

[0045] 1. Sieve section 2. Storage section 2a Leg 3 Compression spring 4 Support plate 5 Lid 5a opening 10 Upper housing 10a Peripheral wall 10b Holding plate 11 Sieve mesh 12 tray 13 through hole 14 sphere 15 elastic member 16 Fastening member 17 First discharge pipe 20 Lower housing 21 Umbrella member 22 Second discharge pipe 30 vibration mechanism 31 drive motor 32 Upper weight 33 Lower weight 40 Supply section 41 Support stand 42 Support column 43 Hopper 43a Discharge port 44 Electromagnetic feeder (speed adjustment part) 45 Trough 46 Upper inner cylinder 47 Lower inner cylinder 47a Long hole 47b Supply port 48 Fixing screw 49 Flexible Shoot 50 control device 51 first sensor 52 Second Sensor 100 Vibrating Screen Device D Distance H Height P powder

Claims

1. a housing surrounded by a peripheral wall; a sieve mesh provided inside the housing; a vibration mechanism that applies vibration to the housing; a supply unit that supplies powder above the sieve mesh through an inner cylinder, The inner cylinder is capable of being filled with powder at least at a lower end portion when the supply unit supplies powder above the sieve screen, A vibrating screening device, wherein the distance from the sieve screen to a supply port formed at the lower end of the inner cylinder is smaller than the height from the sieve screen to an upper end of the peripheral wall.

2. The vibrating screen device according to claim 1 , wherein the inner cylinder is configured so that the distance from the sieve screen to the supply port is adjustable.

3. the supply unit includes a speed adjusting unit that adjusts the speed at which the powder is introduced into the inner cylinder, a first sensor for detecting the presence or absence of powder is provided in the inner cylinder; 3. The vibrating sieve device according to claim 1, wherein the speed adjusting unit increases the powder charging speed when the first sensor does not detect the powder.

4. a second sensor for detecting the presence or absence of powder is provided above the first sensor in the inner cylinder; The vibrating screen device according to claim 3 , wherein the speed adjusting unit reduces the speed at which the powder is introduced when the second sensor detects the powder.

5. A vibrating screening method using a vibrating screening device including a housing, a sieve mesh provided inside the housing, a vibration mechanism that applies vibration to the housing, and a supply unit that supplies powder above the sieve mesh through an inner cylinder, A vibrating sieve method, wherein the supply unit supplies powder above the sieve mesh while the powder is filled at least in the lower end of the inner cylinder.

6. the supply unit includes a speed adjusting unit that adjusts the speed at which the powder is introduced into the inner cylinder, a first sensor for detecting the presence or absence of powder is provided in the inner cylinder; The vibrating sieve method according to claim 5 , wherein the speed adjusting unit increases the powder charging speed when the first sensor does not detect the powder.

7. a second sensor for detecting the presence or absence of powder is provided above the first sensor in the inner cylinder; The vibrating sieve method according to claim 6, wherein the speed adjusting unit reduces the speed at which the powder is introduced when the second sensor detects the powder.

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