JPH0513542U - Wet classifier - Google Patents

Abstract

(57) [Summary] [Purpose] A wet classifier that discharges product sand with a scraping bucket truck or sends it to the next tank accompanies a large amount of treated water with the product sand. The present invention aims to reduce the amount of this treated water that accompanies the product sand, reduce the water content of the product sand, reduce the amount of slurry and fine sand carried out with the treated water, and improve the handling of the product sand. Has an aim. [Constitution] Following the water permeable bucket 11 of the raking bucket truck 3, a water guide plate 13 is provided on the downstream side in the moving direction of the water permeable bucket 11.
Was established.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wet classifier that classifies sand by mixing water with a raw material for sand containing mud, wood chips, etc., stirring and washing the sand, and particularly equipped with a horizontal axis spiral impeller and a scraping bucket wheel. Wet classifier.

[0002]

[Prior Art]

 FIG. 7 is a vertical sectional view of the wet classifier. A spiral impeller 2 and a scraping bucket wheel 3 are provided in the processing tank 1 in common with a horizontal drive shaft 4, and the upper half of each of the processing tanks 1 has a liquid level determined near the lower half. It is submerged. A chute 9 having an upper end inserted into the raking bucket truck 3 is provided. The drive shaft 4 is supported by bearings 5 provided on both end walls of the processing tank 1, and the drive shaft 4 and the reduction motor 6 are connected by a chain transmission device 7. When the electric motor 6 is energized, the drive shaft 4 rotates via the chain transmission device 7, and the spiral impeller 2 and the scraping bucket wheel 3 rotate. When the raw sand is poured into the treatment tank 1 along with the wash water and poured, the water and the sand are agitated in the treatment tank 1, and the sand is washed and sent by the spiral impeller 2 in the direction of the arrow, and the raking bucket truck. The sand lifted in 3 is sent out of the machine by the chute 9. This sand is the sand of the grain size that is the intended product sand. Then, the remaining muddy water containing lighter and finer sand overflows from the upper edge of the treatment tank 1.

FIG. 8 is a vertical cross-sectional view of a conventional bucket bucket car seen from the side of FIG. 1, and a part thereof is shown. A plurality of water permeable buckets 11 are arranged on the drive shaft 4 in a circumferential direction of an annular bucket vehicle frame 8 supported by radial arms 12. The water-permeable bucket 11 has a net-like shape, and the eyes are 9 to 12 mm square. The sand sent toward the scraping bucket wheel 3 by the rotation of the spiral impeller 2 rotates the scraping bucket wheel 3 in the direction of the arrow A in the figure, so that the sand and water at the bottom of the processing tank 1 are stored in the bucket 11. Scoop up and lift up. When the bucket 11 separates from the liquid surface in the processing tank 1, water escapes from the mesh of the bucket 11 and the drained sand remains. When the sand reaches near the upper part of the scraping bucket truck 3, the sand in the bucket 11 is discharged outside the machine by the chute 9.

The above is a basic type of wet classifier. However, in the case of a raw material having a large amount of mud, since the sand is washed in two stages, there is a type in which the wet classifier is integrated into two in a skewered form. Also, as a means for enhancing the sand washing effect, Japanese Patent Application No. 2-417615 in which a partition plate is provided in the processing tank previously filed by the present applicant, Japanese Patent Application No. 3-126828 with a movable discharge chute, or There is a wet classifier disclosed in Japanese Utility Model Laid-Open No. 1-151847 in which a vibrating screen is provided at a discharge portion of product sand.

[0005]

[Problems to be solved by the device]

 The sand dropped from the raking bucket truck 3 to the chute 9 still contains a large amount of water even after being dehydrated in the permeable bucket, and it is necessary to further separate the water. There is a gutter for returning the muddy water mixed with water and slurry and fine sand separated from the product sand by the vibrating sieve to the treatment tank 1 (Japanese Utility Model Laid-Open No. 1-151847 mentioned above). It is provided.

Since a large amount of water containing slurry and fine sand is drained together to obtain product sand, a strong vibrating sieve is required, and the slurry and fine sand from the vibrating sieve are contained. The gutter that returns the falling water to the treatment tank must use a large amount of water. Since the product sand discharged from the chute 9 is dehydrated, the length of the dehydration vibrating conveyor becomes long even when a dehydration vibrating conveyor is installed, which requires an expensive and large floor area, and the amount of drainage from the dehydrating vibrating conveyor becomes large. Wastewater treatment becomes a problem.

[0007] The above is the case where the sand discharged from the raking bucket car becomes product sand. However, if there is a lot of mud, a unit equipped with a screw impeller and a raking bucket car is installed in series, When transferring the sand discharged from the raking bucket truck of the unit of the next unit to the unit of the next stage, the unit of the previous stage does not wash the sand sufficiently and contains a large amount of muddy water. Since a large amount of muddy water will be brought in and the sand will be washed sufficiently, the equipment will become even larger and a large amount of water will be required for washing the sand.

As described above, conventionally, the water contained in the sand discharged from the scraping bucket truck is left to be discharged from the scraping bucket truck, and when it becomes product sand, it is special after being discharged from the scraping bucket truck. It is performing dehydration.

An object of the present invention is to provide a wet classifier equipped with a raking bucket vehicle equipped with means for reducing the amount of treated water carried out together with the sand discharged.

[0010]

[Means for Solving the Problems]

 Looking at the behavior of the permeable bucket of the conventional bucket truck, it can be seen that a large amount of water falls from the permeable bucket from which the treatment tank has separated water. The water that falls from the permeable bucket preceding the permeable bucket where the water separates next enters. It can be observed that this state continues for about 45 ° at the rotation angle of the raking bucket after the water is removed from the permeable bucket. Therefore, the spillage containing slurry and fine sand from the preceding permeable bucket falls on the next permeable bucket, but the sand in the next permeable bucket acts as a filter element, It deposits slurry and fine sand in the fallen water, further impeding water permeability. Therefore, the amount of slurry and fine sand that should not be separated from muddy water is also increased in the permeable bucket. Therefore, in the present invention, a water guide plate is provided so that the falling water of the preceding permeable bucket does not enter the succeeding permeable bucket.

According to the present invention, in a wet classifier having a horizontal axis extrusion spiral impeller and a raking bucket wheel housed in a processing tank, the raking bucket wheel includes a plurality of water-permeable buckets arranged in the circumferential direction. It is a wet classifier characterized by having a water guide plate that immediately follows the falling direction of the permeable bucket and discharges it to the outside of the permeable bucket, immediately downstream of the moving direction of all or some of the permeable buckets. ..

[0012]

[Action]

 A large amount of water permeates and falls from the permeable bucket immediately after the water is released from the surface of the treatment tank. And even if the next permeable bucket releases water, the fall of the preceding permeable bucket does not enter the next permeable bucket due to the water guide plate. Therefore, since the permeable bucket does not bring in the falling water of the other permeable buckets only by the draining action after water separation, the product sand discharged has a small water content, and the content of slurry, fine sand, etc. is small.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The wet classifier to which the present invention is applied is the wet classifier equipped with the single spiral impeller 2 and the raking bucket wheel 3 described in FIG. 7, and the one equipped with the spiral impeller 2 and the raking bucket wheel 3. As a unit, it is composed of two stages of skewered shape, and it is a wet classifier in which rough sand is washed in the first stage and fine sand is washed in the second stage, or the processing tank that the present inventor applied earlier is partitioned by a partition plate and placed at the bottom of the partition plate. Wet classifier (Japanese Patent Application No. 2-417615) or shoot that connects the reprocessing tank with the spiral impeller in the front processing tank and the spiral impeller and scraping bucket wheel in the rear processing tank The present invention is applicable to any wet classifier such as the movable wet classifier of Japanese Patent Application No. 3-126828. What is described in the examples is an application example to a wet classifier equipped with the features of Japanese Patent Application No. 3-126828 previously proposed by the present inventor.

1 to 3 show three views of the present invention, FIG. 1 is a side view, FIG. 2 is a front view, and FIG. 3 is a plan view. The description is omitted. As shown in FIG. 1, the raking bucket truck 3 has a bucket truck frame 8 arranged at equal intervals in the circumferential direction, and a water permeable bucket 11 is provided in the bucket truck frame 8. A water guide plate 13 is continuously provided on the downstream side of the moving direction b of the water permeable bucket 11. FIG. 4 is a partially enlarged detailed view of FIG. 1, and FIG. 5 is a perspective view showing the details of the water permeable bucket 11 and the water guide plate 13. The bucket vehicle frame 8 forms the outer circumference of the bucket vehicle frame 8 between a front side plate 8a in the shape of a hollow disk fixed to the arm 12 and a rear side plate 8b in the shape of a hollow disk that is not supported by the drive shaft 4 on the inner peripheral side. Are joined together by an outer peripheral plate 8c, which has an annular shape as a whole. The front and rear side plates 8a and 8b are made of perforated plates. As shown in FIG. 4, the outer peripheral plate 8c is related to the moving direction b around the scraping bucket vehicle 3, and the radius from the drive shaft 4 is reduced as it moves, and the reduced radius portion is the back of the permeable bucket 11. It is a plate 11a. The water-permeable bucket 11 is surrounded by a front plate 11b, side plates 11c, a bottom plate 11d, and a back plate 11a, and has a container shape. Both side plates 11c are fixed to the bucket car frame front side plate 8a and rear side plate 8b. In the above, the water-permeable bucket 11 is water-permeable except for the back plate 11a, and is made of a perforated plate, a wire net, or the like. In the case of a wire net, the water-permeable bucket 11 is supported by frames provided along the edges and edges of the water-permeable bucket 11. Carried (not shown). The hole diameter of the perforated plate of the water permeable bucket 11 and the size of the wire mesh may be those conventionally used. The water guide plate 13 has its rear end fixed to the front and rear side plates 8a and 8b of the bucket vehicle frame, and its front end fixed to a mounting base 16 which is joined by a pin 15 to a bracket 11e fixed to the side plate 11c of the water permeable bucket. The upper edges of the bottom plate 11d and the side plates 11c of the water permeable bucket face the radial direction of the scraping bucket truck 3. The water guide plate 13 is non-perforated, and is in parallel with the bottom plate 11d of the water permeable bucket. The water guide plate 13 has a size that covers the upper surface opening of the water permeable bucket 11 on the downstream side with respect to the moving direction b of the peripheral surface of the raking bucket vehicle 3, and is substantially rectangular. It should be noted that the water guide plate 13 may be a perforated plate in order to reduce the weight, but in that case, the holes of the perforated plate need to be small enough to prevent the permeation of foreign matter in the muddy water, and thus the perforated plate is substantially non-perforated. It has the same effect as a board.

In the above description, the water guide plate 13 is preferably provided in each of the water permeable buckets 11, but may be provided in a part thereof.

FIG. 6 is a partially enlarged view of FIG. 1 and is an enlarged view of the product discharge device. A bearing 18 is fixed on a chute support frame 17 fixed to the rear end side of the processing tank 1. A chute 9 is swingably supported by a swing shaft 19 supported by the bearing 18. The processing tank 1 is provided with a lower stopper 21 which defines a clockwise rotation limit position around the swing shaft 19 of the shout 9. The chute 9 is provided with shrouds 9a directed upwards on both sides to prevent sand from escaping to the left and right. The shroud 9a is provided with a portion having a width narrowed downwards and an upper end at the upper part. Made of perforated plate. The upper end of the shoe 9 is located inside the scraping bucket truck 3.

A weight 20 is provided at the lower end of the chute 9 and a roller follower 22 is provided on the lower surface of the chute 9 on the same side as the weight 20 with respect to the swing shaft 19, and a rotary cam for lifting the roller follower 22. 23 is provided. The rotary cam 23 is fixed to a cam shaft 26 driven by a chain transmission device 25 from a shout reduction motor 24, and the shaft 26 is supported by a bearing 27 fixed to a shout support frame 17.

Next, the operation of the above configuration will be described. When the reduction motor 6 is energized, the drive shaft 4 is rotated via the chain transmission device 7, and the spiral impeller 2 and the scraping bucket wheel 3 are rotated. Raw sand and cleaning water are put into the processing tank 1. The spiral impeller 2 scrubs the raw sand in the treatment tank 1 and sends it to the scraping bucket wheel 3. When reaching the raking bucket car 3, the water-permeable bucket 11 that rotates and goes upward from below scoops up sand containing a large amount of water. Water containing slurry fine sand falls from the water-permeable bucket 11 that has separated from the water surface of the treatment tank 1. The dropped water falls mainly on the inside of the scraping bucket truck 3 at the water guide plate 13 and returns to the treatment tank 1. As shown in FIG. 4, some of the falling water from the permeable bucket 11 that has moved upward does not fall onto the water guide plate 13, but at that position, the next permeable bucket 11 following the preceding permeable bucket 11 is out of the falling position. It When the permeable bucket 11 reaches the uppermost position of the scraping bucket truck 3 near C in FIG. 1, the product sand is dropped to the shout 9, but the water content is lower than in the conventional case. On the other hand, the rotating cam 23 fixed to the rotating cam shaft 26 from the shutter reduction motor 24 rotates via the chain transmission device 25.

By the rotation of the rotary cam 23, the shout 9 is lifted counterclockwise about the swing shaft 19 from the lower end, and the shout 9 is urged clockwise by the gravity of the weight 20 about the swing shaft 19. It swings and collides with the lower stopper 21. By this collision, the sand surely flows over the shout 9, the clogging of the perforated plate is prevented, and the product sand is further drained from the shout 9.

In the present embodiment, the product sand discharged from the raking bucket car is shocked by the shock of the perforated plate that further rocks to prevent clogging, and is discharged, and the water guide plate is mounted on the raking bucket car. It is suitable because the water content is removed at almost the position of the wet classifier in addition to the fact that the product sand content is small due to the installation, but even if a dewatering vibration conveyor is provided after the shout 9, Well, in this case, the length of the dehydration vibration conveyor can be shortened.

[0021]

[Effect of the device]

 In the present invention, since the water guide plate is provided between the permeable buckets of the raking bucket truck as described above, the water falling from the preceding permeable bucket does not fall into the permeable bucket, which reduces the water content of the product sand. In addition, mixing of slurry and fine sand into the product sand is reduced. Further, since the water content of the product sand is small, the subsequent product discharging device has good transportability of the product sand, and the equipment can be shortened.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a partially enlarged detailed view of FIG. 1 showing a characteristic part of the present invention.

FIG. 5 is a partial perspective view of FIG.

FIG. 6 is an enlarged detailed view of the product discharge device of FIG.

FIG. 7 is a front view of a wet classifier.

FIG. 8 is a side view of a conventional bucket truck.

[Explanation of symbols]

 1 treatment tank 2 spiral impeller 3 scraping bucket wheel 11 water-permeable bucket 13 water guide plate

Claims (1)

[Scope of utility model registration request] 1. A wet classifier having a horizontal-axis extrusion spiral impeller and a raking bucket wheel housed in a processing tank, wherein the raking bucket wheel has a plurality of water-permeable buckets arranged in the circumferential direction. The wet classifier is characterized in that a water guide plate is provided immediately following the downstream side of the moving direction of all or some of the water-permeable buckets to receive the falling water of the water-permeable buckets and drain the water to the outside of the water-permeable buckets.