JP6044957B2 - Wet sieving equipment - Google Patents

Description

  The present invention relates to a wet sieving apparatus for sorting sample powders such as silica and carbon black by particle size, or performing sieving while sprinkling water to measure the particle size.

  As such a wet sieving device, for example, as shown in Patent Document 1, a nozzle arm in which a plurality of jet nozzles are formed in parallel is placed above the sieve and ejected from a jet nozzle formed obliquely. A sprinkling mechanism has been used in which the nozzle arm is rotated by the reaction force of the water jet.

  In this wet sieving device, the water receiving tank below the nozzle arm is vibrated by air vibration to vibrate the sieve.

JP 49-64962 A

  However, since the above watering mechanism is simply rotated while jetting water in a shower-like manner, the water flow from each jet outlet hits the sieve surface while moving on a concentric circle around the rotation center. Sprinkling unevenness is likely to occur locally in the radial direction, and the sample powder may remain in a partial arc around the rotation center, resulting in sieving unevenness.

  The present invention has been made by paying attention to such a situation, and provides a wet sieving apparatus capable of performing sieving without sieving unevenness by spraying water sufficiently and uniformly over the entire sieving surface. This is the main purpose.

  In order to achieve the above object, the present invention is configured as follows.

(1) The present invention is a wet sieving device including a watering mechanism above a sieve that is vibrated by an excitation mechanism.
The water sprinkling mechanism includes a rotatable water sprinkling nozzle that spouts water in a conical annular shape downward from the spout, and the spout of the water sprinkling nozzle has a conical annular shape formed between an opening and a core. It is a spout .

  According to the present invention, the water sprayed in a conical shape from the watering nozzle collides with the sieve surface in an annular shape, and the sample powder on the sieve surface is diffused so as to be splashed outward from the water annular collision location. In addition, the annular diffusion moves in the circumferential direction along with the rotation of the watering nozzle, and the lump of the sample powder is also efficiently crushed and widely diffused on the sieve surface. receive.

  (2) In a preferred embodiment of the present invention, the watering mechanism is provided with the watering nozzles at two locations having different distances from the rotation center.

  According to this embodiment, since the annular diffusion operation acts and rotates at different positions in the radial direction, the water spray and the sample powder are more efficiently diffused over the entire sieve surface.

  (3) In another embodiment of the present invention, the rotation shaft is rotatably supported on a central support shaft fixedly arranged along the rotation center, and the above-described operation is performed via a water passage formed inside the central support shaft. Water for watering is supplied to the watering nozzle.

  According to this embodiment, the upper part of the central support shaft is protruded above the rotating shaft, and a water supply pipe or the like is connected to the protruding portion to supply water to the watering nozzle without using a bulky and expensive rotating joint. Can do.

  (4) In still another embodiment of the present invention, the upper portion of the rotating shaft is supported on the central support shaft via a rolling bearing, and the lower portion of the rotating shaft is supported on the central support shaft via a sliding bearing.

  According to this embodiment, a rolling bearing that has a low rotational resistance but may be adversely affected by water is provided at the top, and a sliding bearing that is inferior to a rolling bearing in terms of rotational resistance but is not easily affected by water is provided at the bottom. Therefore, the rotational resistance is lower than when both the upper and lower sides are made of sliding bearings, and compared with the case where both the upper and lower sides are made of rolling bearings, it is adversely affected by the leaked water from the lower end of the central support shaft. The rotating shaft can be supported in a difficult state.

  (5) In another embodiment of the present invention, the rotary shaft is formed with a drainage port facing between the rolling bearing and the sliding bearing.

  According to this embodiment, even if the water fed to the lower end of the central support shaft leaks upward through the sliding bearing, it can be drained out from the drain before reaching the upper rolling bearing, It is possible to perform uniform watering by always operating the rolling bearing properly and rotating the rotating shaft smoothly and rotating the watering nozzle for ejecting water in a conical ring shape at a stable speed.

  (6) In another embodiment of the present invention, the diaphragm driven by the excitation mechanism and the vibration case on which the sieve is detachably attached are directly connected by a plurality of connecting rods.

  According to this embodiment, the diaphragm and the vibration case are vibrated and driven integrally through the connecting rod, and the desired watering sieving process is accurately performed by vibrating the sieve attached to the vibration case with a predetermined amplitude. It can be carried out.

  In the conventional example of Patent Document 1 described above, the sieve is vibrated using air vibration, whereas in this embodiment, the sieve attached to the vibrating case is directly vibrated without using air vibration. Compared to the conventional example, the vibration is stronger and the remaining sample powder lump is crushed, and the water film on the sieve surface is broken to smoothly pass water and powder through the mesh to improve the sieving efficiency. Can be made.

  (7) In still another embodiment of the present invention, an adapter for attaching the small-diameter sieve that cannot be directly attached to the vibration case to the vibration case is provided, and the adapter sandwiches the sieve from above and below. A pair of upper and lower adapter rings supported by the connecting rod and the vibration case.

  According to this embodiment, the small-diameter sieve that cannot be directly attached to the vibration case can be supported and attached to the connecting rod and the vibration case while the sieve is sandwiched between the pair of adapter rings. As a result, a small amount of expensive sample powder can be sieved using a small-diameter sieve, the time required for the drying process after sieving can be shortened, and the amount of water spray can be reduced. Can do.

  (8) In another embodiment of the present invention, an ultrasonic vibration applying member for applying ultrasonic vibration is attached to the sieve.

  According to this embodiment, since vibration by an ultrasonic wave can be applied to the sieve in addition to vibration by an excitation mechanism, the remaining sample powder lump is further crushed and a water film on the sieve surface is formed. It can be broken to facilitate the passage of water and powder from the mesh, prevent clogging of the sieve, and further improve the sieving efficiency.

  According to the present invention, the water sprayed in a conical shape from the rotating watering nozzle is sprayed sufficiently and uniformly over the entire screen surface, so that sieving without sieving unevenness can be performed.

It is the whole front view which cut through some wet sieving devices. It is the whole side view which cut through some wet sieving devices. It is AA sectional drawing in FIG. It is a vertical front view of a watering mechanism. It is a longitudinal cross-sectional view which shows the assembly state (a) and disassembly state (b) of a watering nozzle. It is a perspective view of a watering mechanism. It is a vertical front view which shows the usage form of a small diameter sieve. It is a perspective view of the adapter utilized at the time of use of a small diameter sieve. It is a partially vertical front view which shows the watering nozzle of another embodiment. It is a partially vertical front view which shows the watering nozzle of another embodiment. It is a whole side view corresponding to FIG. 2 of another embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is an overall front view in which a part of a wet sieving apparatus according to an embodiment of the present invention is vertically cut, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view taken along line AA in FIG.

  The wet sieving apparatus according to this embodiment is configured to be placed on a table, and a ring that is driven and vibrated by the vibration mechanism 2 while the vibration mechanism 2 is housed and installed in a cast base 1. A vibrating case 3 is provided on the upper part of the base 1, and a sieve 4 formed by stretching a sieve screen 4 b of a predetermined mesh on a cylindrical sieve case 4 a is fitted and attached to the upper end of the vibrating case 3. It has become. The diameter of the sieve 4 is, for example, about φ200 mm.

  An intermediate bottom wall 1a is provided at the upper and lower intermediate portions of the base 1, and the vibration mechanism 2 is mounted on a support base 5 provided in a space below the intermediate bottom wall 1a, and the space above the intermediate bottom wall 1a. Is formed in a collection chamber 6 for the turbid solution of water and particles leaked from the sieve 4, and the turbid solution collected in the collection chamber 6 flows down to the discharge port 7 formed in the peripheral wall of the base 1 and is discharged. It has become so.

  Further, a strut 8 that can be extended and contracted is erected on the upper side of the base 1, and an operation box 9 that performs various input settings and watering control is directed above the strut 8 toward the upper center of the vibration case 3. While being provided in a cantilever manner, a watering mechanism 10 is provided below the free end of the operation box 9. The support column 8 may be attached to the base 1 via a hinge and cantilevered so that the entire operation box 9 and the watering mechanism 10 can be lifted. By doing so, the attachment and detachment of the watering mechanism 10 and the replacement of the sieve 4 and the like, and the maintenance and cleaning of the entire vibration case 3 can be easily performed.

  The vibration mechanism 2 includes a core 11 that is intermittently excited by an electromagnetic coil, a diaphragm 13 that is supported at four positions on the support base 5 via an elastic body 12 such as rubber, and can be displaced vertically. A magnetic body 14 such as an iron plate attached to 13 is provided, and the diaphragm 13 is attracted by the excitation of the core 11 and is displaced downward against the elastic body 12, and the diaphragm 13 is moved along with the release of excitation. The elastic body 12 is configured to be returned and displaced upward. A connecting rod 15 erected from both ends of the diaphragm 13 is projected through the base 1, and an upper protruding portion of the connecting rod 15 is inserted into a split boss 16 provided on the outer periphery of the vibration case 3 and tightened. The diaphragm 13 and the vibration case 3 are integrated with each other via the connecting rod 15 so as to be displaced up and down with a required small amplitude.

  The support base 5 on which the vibration mechanism 2 is mounted is elastically supported by the bottom plate 1b of the base 1 via a pair of upper and lower compression coil springs 17 so that the vibration of the vibration mechanism 2 is directly applied to the base 1. Generation of vibration noise is suppressed.

  At the upper end of each connecting rod 15, a connecting fitting 19 for connecting and fixing the sieve 4 and the anti-scattering case 18 fitted and mounted thereon to the vibrating case 3 is provided.

  The connecting bracket 19 is pivotally connected to the upper end portion of the connecting rod 15 so as to be pivotable up and down around the fulcrum p, and the lower end of the hanging bracket 21 formed of a spring steel wire in a bow shape is connected to the operating lever. 20 and is pivotally supported. With the operating lever 20 pivoted upward, the upper end of the hanging bracket 21 is locked from above to a receiving bracket 22 projecting from the outer surface of the anti-scattering case 18. Thereafter, by rotating the operating lever 20 downward to a position where the connecting point of the hanging bracket 21 to the operating lever 20 exceeds the lever fulcrum p, the receiving bracket 22 is strongly moved downward by the elasticity of the hanging bracket 21 that is elastically deformed. By pulling down, the scattering prevention case 18 and the sieve 4 are elastically pressed and fixed to the vibration case 3.

  The sprinkling mechanism 10 has a nozzle arm 26 mounted horizontally on the lower end of the rotary shaft 25 extending downward from the free end of the operation box 9, and rotating the nozzle arm 26 by rotating the rotary shaft 25. Water is jetted downward from the two water spray nozzles 27 provided in the nozzle arm 26, and the detailed structure thereof is as follows.

  4 is a longitudinal front view of the watering mechanism 10, FIG. 5 is a longitudinal sectional view showing an assembled state (a) and a disassembled state (b) of the watering nozzle 27, and FIG. 6 is a perspective view of the watering mechanism 10. .

  The rotating shaft 25 is configured as a cylindrical shaft, and is supported by an outer support 29 and 30 so as to be rotatable on a central support shaft 28 vertically suspended from the operation box 9. Here, a rolling bearing having a small rotational resistance is used for the upper bearing 29, and a sliding bearing composed of a pair of upper and lower bearing bushes that are not easily affected by water is used for the lower bearing 30. The bearing bushes are not necessarily used as a pair, and only one bush may be provided in the lower part.

  The center support shaft 28 is configured as a cylindrical shaft provided with a water passage 31 therein, and an upper portion of the center support shaft 28 protruding upward from the upper end of the rotary shaft 25 is fixed to the operation box 9. Pressurized water, which is fitted and fixed to the boss member 32 and supplied through the water supply pipe 33 connected to the shaft support boss member 32, is supplied to the nozzle arm 26 at the lower end of the rotation shaft via the water passage 31 of the center support shaft 28. It comes to lead.

  The nozzle arm 26 is press-fitted and fixed to both lateral ends of a connecting boss 34 screwed and connected to the lower end of the rotary shaft 25, and the water passage 31 formed in the center support shaft 28 and the water passage formed in the nozzle arm 26. 35 is in communication.

  The rotary shaft 25 has a drain port 36 formed between the upper and lower sliding bearings 30, and the water leaked upward through the sliding surface of the lower sliding bearing 30 is the drain port 36. Thus, the leaked water flows into the outside and the leaked water enters the upper rolling bearing 29 so that the bearing performance is not adversely affected.

  In addition, a pulley portion 37 is provided on the outer periphery of the upper portion of the rotary shaft 25, and is linked to a belt by a motor 38 with a speed reducer (see FIG. 2) provided in the operation box 9. It is rotated at a set speed for a set time.

  The watering nozzles 27 are provided on the nozzle arm 26 at two locations with different distances from the rotation center x that is the axis of the rotation shaft 25. Then, as shown in FIG. 5, the watering nozzle 27 is driven and fixed to a conical opening 40 formed in the lower surface of the nozzle arm 26 with a core 41 formed in a conical cone shape having a small diameter. A conical annular spout 42 is formed between the opening 40 and the core 41, and water is ejected from the spout 42 downward in a conical shape. By ejecting water into a conical ring in this way, it is possible to effectively disintegrate the powder on the sieving surface and perform smooth sieving with a small amount of water.

  A sleeve 43 divided into two along the diametrical direction is externally fitted to the lower portion of the shaft supporting boss member 32 that fixes and supports the upper portion of the center supporting shaft 28, and is clamped and fixed by a ring-shaped spring clamp 44. The central boss 45a of the cover plate 45 made of transparent resin divided into two is fitted into the groove formed on the outer periphery of the lower end of the sleeve 43 so that the ring-shaped spring clamp 46 can be held and fixed in the same manner. It has become. Therefore, when the height of the sieve 4 or the scattering prevention case 18 is changed, the sleeve 43 is replaced with a different height according to this, and the installation height of the cover plate 45 is changed to the upper end of the scattering prevention case 18. It can be adapted to the height of the opening.

  The wet sieving apparatus according to this embodiment is configured as described above, and the sprinkling nozzle 27 is rotated to sprinkle water while vibrating the sieve 4 containing the sample powder, so that a conical annular shape is formed from the watering nozzle 27. The water sprayed on the screen collides with the sieving screen 4b in an annular manner, and the sample powder on the screen is diffused so as to be splashed outward from the water annular collision location, and as the water spray nozzle 27 rotates. The annular diffusion moves in the circumferential direction, and the lump of sample powder is also efficiently crushed and diffused widely on the sieve surface, and is subjected to a leakage action from the sieve surface.

  In addition, since the annular diffusion operation acts at different positions in the radial direction and pivots, the water spray and the sample powder are more efficiently diffused over the entire sieve surface.

  FIG. 7 and FIG. 8 show an embodiment in which a small amount of sample powder is sieved with a sieve 4 (s) having a small diameter, for example, about φ75 mm, using the same wet sieving device.

  When the small-diameter sieve 4 (s) is used, an adapter is used instead of the large-diameter sieve 4. This adapter is composed of a lower adapter ring 52 formed by connecting inner and outer ring members 52a and 52b with radial stays 52c into a double ring shape, an upper adapter ring 51 having a similar structure, and a small diameter cylindrical shape. The lower adapter ring 52 is fitted and connected to the vibration case 3, and the sieve 4 (s) is fitted and connected to the central ring portion 52b of the lower adapter ring 52; Further, the scattering prevention case 53 is fitted and connected to the connected sieve 4 (s), and the center ring portion 51 b of the upper adapter ring 51 is inserted into the scattering prevention case 53. Next, the hanging bracket 21 of the connecting bracket 19 is locked to the upper edge of the upper adapter ring 51, and the operation lever 20 is rotated downward. The stacked lower adapter ring 52, the sieve 4 (s), and the scattering prevention. The case 53 and the upper adapter ring 51 are pressed and fixed to the vibration case 3.

  In this case, the nozzle part of the watering mechanism 10 is replaced with one corresponding to the diameter of the sieve 4 (s). For example, as shown in FIG. 7, the watering nozzle 27 is located at a position away from the rotation center x. May be provided with only one.

  Thus, since the sieving can be performed by the small-diameter sieve 4 (s), the sample powder to be used can be reduced, and it is effective for sieving the expensive sample powder.

  In addition, the amount of water used for sieving can be reduced, and the time required for the drying process after sieving can be shortened.

(Other embodiments)
The present invention can also be implemented in the following forms.

  (1) As shown in FIG. 9, the nozzle arm 26 can be configured to be able to be expanded and contracted and fixed in a tightening set, and the position of the watering nozzle 27 can be changed in the rotational radius direction. In this case, it is convenient for the position adjustment operation to provide a scale or mark indicating the position of the watering nozzle 27 on the outer peripheral surface of the nozzle arm 26.

  (2) As shown in FIG. 10, a nozzle arm 26 having a water spray nozzle 27 is detachably screwed and connected to a connecting boss 34 provided at the lower end of the rotary shaft 25 to replace the nozzle arm 26 with a different length. Thus, the rotation radius of the watering nozzle 27 can be changed. In this case, water can be sprayed by a single water spray nozzle 27 by attaching a plug instead of the one nozzle arm 26.

  (3) In the above-described embodiment, the water spray nozzle 27 is rotationally moved by driving and rotating the rotary shaft 25, but the spray axis of the water spray nozzle 27 is inclined obliquely rearward and downward and ejected from the water spray nozzle 27. It is also possible to rotate the nozzle arm 26 in a certain direction by the horizontal component of the water jet reaction force. Further, the nozzle arm 26 can be provided with an auxiliary jet opening that opens in the direction opposite to the nozzle rotation direction, and the rotational force can be generated by the jetting reaction force of water jetted from the auxiliary jet outlet.

  (4) The vibration mechanism 2 is not limited to the electromagnetic type as described above, and a mechanical vibrator that vibrates and drives the diaphragm 13 with an eccentric weight that rotates at high speed can also be used.

  (5) As another embodiment of the present invention, as shown by an imaginary line in FIG. Then, in addition to the vibration by the vibration mechanism 2, ultrasonic vibration may be applied. An ultrasonic wave is applied to the ultrasonic vibration band 60 via an ultrasonic oscillator and a converter (not shown). As an apparatus for applying this ultrasonic vibration, for example, an ultrasonic vibration apparatus manufactured by Artech Systems is suitable.

  By applying such ultrasonic vibration, the remaining sample powder lump is further crushed and the water film on the sieve surface is broken from the mesh as compared with the case of only the vibration by the vibration mechanism 2. The passage of water and powder can be made smooth, clogging of the sieve can be prevented, and the sieving efficiency can be further improved.

DESCRIPTION OF SYMBOLS 2 Excitation mechanism 3 Vibration case 4 Sieve 10 Sprinkling mechanism 13 Diaphragm 15 Connecting rod 25 Rotating shaft 26 Nozzle arm 27 Sprinkling nozzle 28 Center support shaft 29 Rolling bearing 30 Sliding bearing 36 Drain outlet 42 Spout port x Rotation center

Claims (8)

In the wet sieving device provided with a watering mechanism above the sieve vibrated by the vibration mechanism,
The water sprinkling mechanism comprises a rotatable water sprinkling nozzle that spouts water in a conical ring shape downward from a spout ,
The spout of the watering nozzle is a conical annular spout formed between the opening and the core.
A wet sieving device characterized by that. The watering mechanism is provided with the watering nozzles at two locations with different distances from the rotation center, respectively.
The wet sieving device according to claim 1. A rotation shaft is rotatably supported on a central support shaft fixedly arranged along the center of rotation, and water for sprinkling is supplied to the watering nozzle through a water passage formed inside the center support shaft.
The wet sieving device according to claim 1 or 2. The upper part of the rotating shaft is supported on the central support shaft via a rolling bearing, and the lower portion of the rotating shaft is supported on the central support shaft via a sliding bearing.
The wet sieving device according to claim 3. The rotary shaft is formed with a drain port facing between the rolling bearing and the sliding bearing.
The wet sieving device according to claim 4. Directly connecting a diaphragm driven by the excitation mechanism and a vibration case on which a sieve is detachably mounted with a plurality of connecting rods,
The wet sieving device according to any one of claims 1 to 5. An adapter for mounting the small-diameter sieve that cannot be directly mounted on the vibrating case to the vibrating case is provided, and the adapter sandwiches the sieve from above and below and is supported by the connecting rod and the vibrating case. Having an adapter ring,
The wet sieving device according to claim 6. An ultrasonic vibration application member that applies ultrasonic vibration is attached to the sieve.
The wet sieving device according to any one of claims 1 to 7.

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