CN211035637U - Equipment for pretreating sludge - Google Patents

Abstract

The utility model provides an equipment for being directed at silt carries out preliminary treatment, include: the screening device comprises a plurality of screening screws which are arranged approximately in parallel, and screening gaps for discharging undersize materials are formed by the adjacent screening screws at intervals; the feeding device is positioned at the upstream of the screening device along the treatment process and is used for providing sludge materials to be treated for the screening device, and the feeding device comprises a receiving hopper used for receiving the sludge materials to be treated; the spraying component is communicated with a water source through a pipeline and is provided with a spraying outlet corresponding to the screening screw and the receiving hopper. The utility model discloses an equipment for being used for carrying out preliminary treatment to silt, the sieve mesh that appears when can effectual solution is present to carry out preliminary treatment to silt through drum sieve or shale shaker easily blocks up, sieve not fine enough and lead to the serious problem of equipment wearing and tearing because the drive load is great.

Description

Equipment for pretreating sludge

Technical Field

The utility model relates to a silt processing technology field especially relates to an equipment for being used for carrying out preliminary treatment to silt.

Background

The presence of sludge (including but not limited to trench sludge, box culvert sludge, river sludge, etc. in drainage network pipes/dredging pipes) can cause a number of undesirable effects. For example, the dredging sludge affects the drainage smoothness of a drainage pipe network, is very easy to cause blockage and sewage overflow, and is easy to cause urban waterlogging in flood season. The deposited sludge of the box culvert can affect the drainage capacity of the box culvert, and particularly affects the quick drainage function of the box culvert in the flood season. The river sludge can generate smell which causes people to feel uncomfortable and even dislike in smell, the phenomenon of sensory pollution of the water body occurs, and the living and working environments of people are worsened. Therefore, the deposited sludge needs to be removed periodically. Because the removed sludge usually has large water content and complex components, the direct stacking or landfill easily causes secondary pollution to the environment and occupies more land resources. Therefore, the removed deposited sludge is generally subjected to reduction, harmless and recycling treatment.

Sludge treatment is a systematic project, which comprises a plurality of process steps, and the process steps need to be matched and connected with each other to achieve the final treatment purpose. The pretreatment is a prior step of sludge treatment, and aims to remove garbage impurities including but not limited to stones, bricks, wood blocks, plastic bags, woven bags, wood strips, metal wires, bottles, glass slag and the like contained in the sludge, avoid the garbage impurities from damaging and winding equipment related to a subsequent treatment stage, and further form effective protection for the subsequent treatment stage.

At present, a sludge pretreatment process is mostly finished by adopting a drum screen or a vibrating screen. Practice proves that due to the fact that components of the sludge are complex, screening equipment such as a drum screen or a vibrating screen and the like provided with screen holes is poor in adaptability to materials, and the problems that the screen holes are prone to being blocked, screening efficiency is low, transmission parts of the equipment are prone to being worn and screening is not fine enough can be caused when the screening equipment is adopted to execute pretreatment of the sludge.

For example, solid waste mixed in sludge and having a particle size corresponding to the size of the opening of the screen tends to be stuck in the screen. Or, flexible or soft garbage including plastic bags, woven bags and the like can be easily hung or hooked. Specifically, when the flexible or soft garbage is hung or hooked by the sieve pores, the sieve pores are blocked; when the flexible or soft garbage is caught or hooked by other parts, the sieve holes are easily covered by the flexible or soft garbage, and the blockage of the sieve holes can also be caused. Because the screening equipment such as drum sieve or shale shaker that dispose the sieve mesh does not possess the self-cleaning function under the stifled condition of sieve mesh emergence card, in case above-mentioned problem appears, can only shut down, then clear up by the people, this very big reduction silt preliminary treatment's efficiency.

Also for example, elongated materials, including wood strands, wires, etc., are desirable as the output end material or oversize. In practice, however, some elongate material having an outer diameter smaller than the opening diameter of the screen holes will fall through the screen holes to form undersize. Therefore, the fineness of sieving is insufficient.

In addition, the screening equipment is mostly driven by a single point, so that the abrasion of an intermediate transmission part of the equipment is easily caused. For example, the trommel is supported by a shaft driven by a motor through a speed reducer. Therefore, the driving load of the drum screen is large, and the driving load is concentrated and unbalanced, so that the transmission part of the drum screen is seriously abraded.

SUMMERY OF THE UTILITY MODEL

Based on aforementioned prior art defect, the embodiment of the utility model provides an equipment for being directed at silt carries out preliminary treatment, and it can effectively solve above-mentioned technical problem.

In order to achieve the above object, the present invention provides the following technical solutions.

An apparatus for pretreating sludge, comprising:

the screening device comprises a plurality of screening screws which are arranged in parallel, and screening gaps for discharging undersize materials are formed between every two adjacent screening screws at intervals;

the feeding device is positioned at the upstream of the screening device along the treatment process and is used for providing sludge materials to be treated for the screening device, and the feeding device comprises a receiving hopper used for receiving the sludge materials to be treated;

the spraying assembly is communicated with a water source through a pipeline and is provided with a spraying outlet, and the spraying outlet corresponds to the screening screw and the receiving hopper.

Preferably, the receiving hopper at least comprises two opposite side walls which are obliquely and outwardly expanded, and the spraying assembly comprises a first spraying pipe corresponding to at least part of the side walls and a second spraying pipe arranged above the sieving screw.

Preferably, the spraying outlet of the first spraying pipe is a plurality of first through holes which are arranged on the pipe wall of the first spraying pipe at intervals along the axial direction and point to the side wall; the spraying outlet of the second spraying pipe is a plurality of second through holes which are arranged on the pipe wall of the second spraying pipe at intervals along the axial direction and point to the screening screw, and nozzles are arranged in the second through holes.

Preferably, at least two inclined and outward-expanding side walls at the left end and the right end parallel to the conveying direction of the sludge material to be treated are respectively provided with the first spraying pipes at positions close to the upper ends of the side walls.

Preferably, the feeding device is a vibrating feeder and comprises two pairs of inclined outwardly-expanded side walls; the side wall with the smaller inclination angle in the rear end side wall far away from the screening device and the front end side wall close to the screening device is also provided with first spray pipes at the positions close to the upper ends of the side walls, and the three first spray pipes are connected in series end to end.

Preferably, the first spraying pipe correspondingly arranged on one of the left end side wall and the right end side wall is used for being communicated with a water source through a pipeline, and the tail end of the first spraying pipe correspondingly arranged on the other of the left end side wall and the right end side wall is closed or provided with a switch valve.

Preferably, the feeding device is a screw feeder, the bottoms of the two obliquely and outwardly expanded side walls at the left end and the right end parallel to the conveying direction of the sludge material to be treated are connected with a conveying channel, and a conveying screw rod driven by a motor is arranged in the conveying channel; the conveying channel penetrates through the side wall close to the front end of the screening device and extends to the upper part of the screening screw.

Preferably, the screening device and the feeding device are borne on a frame, a cover plate covering the screening device is arranged at the top of the frame, a side plate is arranged on the outer side of the frame, the cover plate and the side plate form an inner space for accommodating the screening device, and an observation window is arranged on the side plate.

Preferably, the top of frame is equipped with the striker plate of slope, the striker plate has and is close to the inner that the frame is connected and keep away from the outer end of frame, the outer end is higher than the inner, the inner extends to in the material receiving hopper.

Preferably, a detection element is arranged in the receiving hopper and used for detecting the water content of the sludge to be treated conveyed into the receiving hopper;

a pipeline for communicating the spraying assembly with a water source is provided with an on-off mechanism, and the on-off mechanism is connected with the detection element; and the detection element controls the on-off mechanism to be closed when detecting that the water content of the sludge to be treated reaches a preset threshold value.

The utility model discloses an equipment for being directed at silt carries out preliminary treatment is through setting up material feeding unit and screw screening plant to the cooperation spray assembly dilutes and washes the pending silt material in entering into material feeding unit and screening plant, can reduce the adhesion of pending silt material, makes less adhesion or even non-adhesion silt on the rubbish debris that obtains through the separation of screw screening plant, obtains comparatively clean rubbish debris. Therefore, the garbage sundries mixed in the sludge material to be treated can be removed efficiently, and the sludge can be effectively pretreated.

Because a plurality of screening screw rods that screening device contains are in the rotating state at the working process, therefore the condition of blockking up screening clearance can not appear in the silt material of treating, guarantees going on continuously of screening operation. And moreover, the screw type screening device is adopted, so that three-phase separation of garbage sundries mixed in the diluted sludge material to be treated can be realized based on the particle size according to the screw pitch and the screening gap of the screening screw. Thus, the fineness of sieving is high.

In addition, as the plurality of screening screws participate in the screening operation, the sludge material to be treated can be screened relatively uniformly by the plurality of screening screws. Therefore, the screening loads borne by the screening screws are smaller in difference, the problem of load concentration is avoided, and abrasion of intermediate transmission parts such as a speed reducer for driving the screening screws to rotate is reduced.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation. In the drawings:

fig. 1 is a front view of an apparatus for pretreating sludge according to a first embodiment of the present invention;

fig. 2 is a plan view of an apparatus for pretreating sludge according to a first embodiment of the present invention;

fig. 3 is a right side view of an apparatus for pretreating sludge according to a first embodiment of the present invention;

fig. 4 is a left side view of an apparatus for pretreating sludge according to a first embodiment of the present invention;

FIG. 5 is a cross-sectional view of section C-C of FIG. 1;

FIG. 6 is a cross-sectional view of section A-A of FIG. 3;

fig. 7 is a front view of an apparatus for pretreating sludge according to a second embodiment of the present invention;

fig. 8 is a plan view of an apparatus for pretreating sludge according to a second embodiment of the present invention;

fig. 9 is a right side view of an apparatus for pretreating sludge according to a second embodiment of the present invention.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The embodiment of the utility model provides an equipment for being directed at silt carries out preliminary treatment, it can be effectual among the solution prior art, the sieve mesh that appears when carrying out preliminary treatment to silt through screening equipment that disposes the sieve mesh such as drum sieve or shale shaker easily blocks up, sieve not fine enough and because the drive load is great and lead to the serious problem of middle drive disk assembly wearing and tearing of equipment, the realization of high efficiency and lower loss is to the preliminary treatment of silt.

As shown in fig. 1 to 9, the apparatus for pretreating sludge according to the embodiment of the present invention mainly includes a screening device 1, a feeding device 2, and a spraying assembly disposed on the screening device 1 and the feeding device 2. The screening device 1 and the feeding device 2 are carried on a frame 3, which frame 3 is arranged on a base 4 by means of a number of uprights, whereby the screening device 1 and the feeding device 2 are lifted off the ground.

The frame 3 is substantially rectangular, a cover plate covering the upper part of the screening device 1 can be arranged on the top of the frame 3, and a side plate 5 is arranged on the outer side of the frame 3. The side plates 5 and the cover plate form an inner space in which the screening device 1 is accommodated to facilitate collection of odor and subsequent deodorization, prevent the odor from overflowing during pretreatment of sludge, and prevent water mist generated during washing from diffusing and splashing outward. Further, as shown in fig. 4 and 6, the side plate 5 may be provided with a window 501 for observation so as to facilitate the operator to observe the operation of the internal screening device 1 without opening the side plate 5 during the operation of the apparatus. The window 501 may be opened on the side plates 5 in three directions, respectively left, right, and front side plates 5, and may include a window opened on the side plates 5 and a transparent material such as glass embedded in the window.

The screening device 1 comprises a plurality of substantially parallel arranged screening screws 101, adjacent screening screws 101 being arranged at a distance so as to form a screening gap for undersize discharge. Every screening screw 101 is all including being shaft-like and the transmission shaft of level setting and setting up the helical blade at the outer wall of transmission shaft, and helical blade can follow archimedes' spiral line, the embodiment of the utility model provides a do not do the restriction to this. The screw pitch is arranged between the spiral blades and can be used as a basis for measuring the size of the garbage materials mixed in the sludge materials to be treated so as to sieve the garbage materials based on the inherent characteristics of the garbage materials. Since the screening device 1 comprises a plurality of screening screws 101, there is correspondingly a plurality of helical blades. Therefore, the rotating directions of all the spiral blades are the same, so that the material screening can be continuously carried out.

The outer ends of the helical blades of the sifting screws 101 extend close to the drive shaft of the adjacent sifting screw 101 and between the helical blades of the adjacent sifting screws 101, i.e. the helical blades of the adjacent sifting screws 101 are staggered. Thus, the spaced arrangement of adjacent sifting screws 101 includes: the spacing between the drive shafts of adjacent sifting screws 101 and the staggered spacing between the helical blades of adjacent sifting screws 101. The transmission shafts of the adjacent screening screws 101 are spaced to form a screening gap in one direction (perpendicular to the transmission shafts or in the transverse direction), and the staggered spacing between the helical blades of the adjacent screening screws 101 forms a screening gap in the other direction (parallel to the transmission shafts or in the longitudinal direction). Thus, the adjustment of the screening gap between adjacent screening screws 101 may be achieved by changing the distance of separation between the drive shafts of adjacent screening screws 101 and/or by adjusting the relative position between the helical blades of adjacent screening screws 101. Thereby, longitudinal and transverse screening gaps are formed, so that the screening of the material is finer.

The sifting screw 101 is driven in rotation by a power unit (not shown) through a reducer, which may together constitute a drive assembly, both of which may be housed in a casing and fixed to the frame 3. The power unit may be specifically a motor or a motor, and the output rotation speed of the power unit may be reduced by a speed reducer and then transmitted to the sieving screw 101, so that the sieving screw 101 obtains rotational power.

One end of the sifting screw 101 is drivingly connected to the drive assembly and is fixed so that one end of the sifting screw 101 is fixed and the other end extends to the outside to form a free end. The plurality of sifting screws 101 are arranged substantially in parallel and the plurality of sifting screws 101 are located in the same plane, i.e. horizontal plane. Said "substantially" may be understood as approaching or that the difference in the included angle between the axial directions of the sieving screws 101 is within a predetermined range. For example, the angle between the axial directions of any two sieving screws 101 is between [0 °, 10 ° ].

The end of the sifting screw 101 remote from the power unit, i.e. the free end, may form a lateral end. The plurality of sifting screws 101 rotate in the same direction, so that the material is transported on the plurality of sifting screws 101 in the incoming material direction, and the ends of the plurality of sifting screws 101 in the incoming material direction form the output end.

The spraying assembly can wash and dilute sludge materials to be treated, and slurry formed in the diluted sludge materials to be treated and large-proportion materials such as broken muck, small stones, sand grains and the like which are washed out and have the size smaller than the screening gaps are used as undersize materials and discharged from the screening gaps. The bottom of the screening device 1 may be provided with a blanking hopper 102 for collecting the discharged undersize and discharging it to the next stage for disposal.

And the materials mixed in the sludge materials to be treated and having the size larger than the screening gap are exposed after being washed by water sprayed by the spraying assembly and can be discharged from a side surface end or an output end. In particular, the lateral ends are intended for the discharge of material having a particle size larger than the screening gap but smaller than the pitch of the screening screw 101, for example comprising stones, bricks, etc. The material is pushed gradually to the side end under the stopping and driving action of the rotating helical blade and finally discharged. The output end is used for discharging materials with the particle size larger than the screw pitch of the sieving screw 101, and most of the materials are large massive heavy materials or long strip light materials, such as large stones, bricks, wood strips, metal wires, various garbage materials and the like.

In order to facilitate discharging, the side end of the screening device 1 may be provided with a slide plate inclined downward, the frame 3 may be provided with a flexible soft curtain 14 corresponding to the slide plate, and the flexible soft curtain 14 may droop and be located outside the slide plate. Therefore, the materials discharged from the side surface end can slide down along the sliding plate, and the flexible soft curtain 14 can shield the materials sliding down from the sliding plate, so that the materials are prevented from splashing.

The feeding device 2 is located upstream of the screening device 1 along the process flow for supplying sludge material to be treated to the screening device 1, and comprises a receiving hopper 201 for receiving sludge material to be treated. The upper end of the material receiving hopper 201 can be provided with an enclosing baffle 202 which is inclined and expanded outwards, and the enclosing baffle 202 is higher than the upper end of the frame 3 so as to increase the area of the feeding hole and ensure that the feeding is carried out smoothly.

In practice, a grab bucket may be used to feed the receiving hopper 201 of the feeding device 2. In the process of conveying sludge materials to be treated to the upper part of the receiving hopper 201, liquid such as sewage may flow out of the grab bucket and drip near the feeding device 2, so that the vicinity of the feeding device 2 is polluted. In view of this, as shown in fig. 3 and 4, an inclined striker plate 13 is disposed at a top end of one side of the frame 3, and the receiving hopper 201 may not be provided with the containment plate 202 corresponding to the striker plate 13 side. The striker plate 13 has the inner that is close to the frame 3 connection and keeps away from the outer end of frame 3, and the outer end is higher than the inner, and the striker plate 13 is the slope situation that the outer end is high the inner low promptly. And the inner end extends into the receiving hopper 201. Thus, the inner end of the striker plate 13 communicates with the receiving hopper 201. When the grab bucket is used for conveying sludge materials to be treated to the position above the material baffle plate 13, sewage liquid seeped out of the grab bucket drops on the material baffle plate 13 and finally flows into the material receiving hopper 201, so that pollution caused by the fact that the sewage liquid flowing out of the grab bucket drops near the feeding device 2 can be avoided.

A support member 6 (which can be a hydraulic cylinder or a pneumatic cylinder) is arranged between the striker plate 13 and the frame 3, and the support member 6 props the striker plate 13 to maintain the striker plate in an inclined state with a high outer end and a low inner end, so that the striker plate 13 is prevented from falling.

The spraying assembly is used for being communicated with a water source through a pipeline and is provided with a spraying outlet corresponding to the screening screw 101 and the receiving hopper 201 so as to spray liquid (for example, water) to dilute and flush sludge materials to be treated entering the receiving hopper 201 and the screening device 1. The sprayed liquid can play a role in diluting the sludge, reduce the adhesion of the sludge, avoid the adhesion of materials on the side wall of the receiving hopper 201 or the screening screw 101 as much as possible and ensure that the pretreatment can be continuously carried out. On the other hand, the garbage sundries mixed in the sludge material to be treated can be washed clean, so that the finally separated garbage sundries have better cleanliness.

Spray water may be used to obtain water in situ, including but not limited to river water, pond water, swimming pool water, treated reuse water, tap water, reclaimed water, and the like. When the water source is pressurized (such as tap water), the spraying component can be directly connected with the water source through a pipeline, and a switch valve can be arranged on the pipeline to control the on-off of the spraying component. When the water source has no pressure or insufficient pressure, a pump body can be arranged on a pipeline connecting the spray assembly and the water source to supply pump output pressure to the water.

To conserve water resources, in one embodiment, the determination of whether to activate the spray assembly may be based on the water content of the sludge to be treated. Specifically, the receiving hopper 201 is provided with a detection element for detecting the moisture content of the sludge to be treated conveyed into the receiving hopper 201. And the pipeline for communicating the spraying assembly with the water source is provided with an on-off mechanism, and the on-off mechanism is connected with the detection element. And when the detection element detects that the water content of the sludge to be treated reaches a preset threshold value, controlling the on-off mechanism to be closed.

In the present embodiment, the detecting element may be any suitable conventional structure, such as a moisture content detector, a microwave moisture meter, a near-infrared moisture meter, etc., and may be fixed to the bottom or the side wall of the receiving hopper 201. The on-off mechanism may be a solenoid valve and the predetermined threshold may be set according to actual conditions, for example 70%. When the detection element detects that the water content of the sludge to be treated reaches a preset threshold value, the sludge to be treated is relatively thin, good in flowability and relatively small in adhesion. At the moment, the sludge material to be treated does not need to be diluted and washed by using the spraying assembly, and the separation of large solid garbage sundries such as stones and bricks can be realized, so that the water resource is saved.

On the contrary, if the detection element detects that the water content of the sludge to be treated is less than the preset threshold value, the condition that the sludge material to be treated is thick, the fluidity is poor and the adhesion is large is indicated. At the moment, the on-off mechanism can be controlled by the detection element to be opened, the connection between the spraying assembly and the water source is switched on, and water is sprayed to the feeding receiving hopper 201 and the screening screw 101 so as to dilute and wash sludge materials to be treated.

As shown in fig. 2, 5 to 8, in the present embodiment, the spray assembly may include a first spray pipe 7 corresponding to the receiving hopper 201 and a second spray pipe 8 corresponding to the sieving screw 101, and the first spray pipe 7 and the second spray pipe 8 may be respectively fixed to the receiving hopper 201 and the frame 3. Wherein, the spraying outlet of the first spraying pipe 7 can be aligned with the side wall and/or the bottom of the receiving hopper 201 for washing the side wall and/or the bottom of the receiving hopper 201, and can dilute the material entering the receiving hopper 201 to prevent the sludge material to be treated from adhering to the side wall and/or the bottom of the receiving hopper 201.

Since the water flowing out of the spray outlet of the first spray pipe 7 is mainly used for diluting the sludge material to be treated entering the receiving hopper 201, the water flowing out of the spray outlet of the first spray pipe 7 may not have to have a high flow rate. Then, the shower outlet of the first shower pipe 7 is designed to allow the liquid to naturally flow out. Therefore, the spraying outlet of the first spraying pipe 7 can be a plurality of first through holes which are arranged on the pipe wall along the axial direction at intervals and point to the side wall of the receiving hopper 201, and the first through holes do not need to be provided with a nozzle and other structures for improving the flow rate of the liquid.

The second spray pipe 8 is positioned above the sieving screw 101, and the spray outlet of the second spray pipe faces downwards and is used for washing away the sludge adhered to the surface of the garbage impurities. Therefore, the water flowing out from the spraying outlet of the second spraying pipe 8 is mainly used for washing the sludge material to be treated discharged onto the sieving screw 101 so as to expose the garbage impurities mixed therein. The spray outlets of the second spray pipes 8 should then be designed such that the liquid is sprayed out at a high speed. Therefore, the spraying outlet of the second spraying pipe 8 may be a plurality of second through holes arranged at intervals along the axial direction and directed to the sieving screw 101, and the second through holes are provided with nozzles. The nozzle is provided with a throttling structure, so that the flow speed is increased when liquid passes through the throttling structure, and sludge materials to be treated are washed better. Moreover, the spray range of the second spray pipe 8 can be expanded by installing the spray nozzles, so that the spray water can cover the screening screw 101 as much as possible, and the garbage sundries mixed in the sludge material passing through the screening screw 101 can be washed.

In the present embodiment, the position of the first shower pipe 7 is mainly related to the structural configuration of the receiving hopper 201. The receiving hopper 201 is a funnel shape with a large top and a small bottom to facilitate feeding, and is provided with a feeding hole for sludge material to be treated to enter, and a discharging hole for sludge material to be treated to be discharged onto the sieving screw 101 is arranged on the side wall close to the sieving device 1. In one embodiment, the upper end of the receiving hopper 201 is open to form the feeding port, the receiving hopper 201 is provided with an opening near the side wall of the sieving device 1, or the receiving hopper 201 is arranged near the side wall and the bottom wall of the sieving device 1 at a distance to form the discharging port.

The receiving hopper 201 at least comprises two opposite side walls which are inclined and expanded outwards. The sludge is easy to adhere due to the small gradient of the inclined flaring side wall. Therefore, the first shower pipes 7 are preferably provided at positions of the corresponding side walls near the upper ends, and the shower outlets of the first shower pipes 7 are aligned with the side walls. The liquid sprayed through the spray outlet may spray the sidewall so that the sludge adhered to the sidewall may be washed away, thereby preventing the sludge from being adhered.

In order to avoid interference with the screening device 1, the two side walls at the left end and the right end which are parallel to the conveying direction of the sludge material to be treated are at least designed into an inclined outward-expanding structure. And the two side walls at the front end and the rear end which are vertical to the conveying direction of the sludge material to be treated can adopt an inclined outward-expanding structural design or a vertical structural design. Therefore, at least the left and right end two obliquely flared side walls are provided with the first shower pipes 7 at positions near the upper ends thereof.

As shown in fig. 1 to 6, in one embodiment, the feeding device 2 may be a vibrating feeder, which includes a bottom wall and two pairs of side walls inclined and expanding outward on the bottom wall, a left end side wall and a right end side wall parallel to the conveying direction of the sludge material to be treated, and a front end side wall and a rear end side wall perpendicular to the conveying direction of the sludge material to be treated. Wherein, the lateral wall with smaller inclination angle in the rear end lateral wall far away from the screening device 1 and the front end lateral wall close to the screening device 1 is also provided with a first spray pipe 7 at the position close to the upper end thereof, and the three first spray pipes 7 are connected in series end to end.

In this embodiment, the inclination angle is an included angle between the side wall and the horizontal plane. The smaller the angle of inclination, the smaller the sidewall slope and the easier the sludge adheres. Therefore, the first shower pipes 7 are provided correspondingly to the one of the rear end side wall and the front end side wall having the smaller inclination angle. In the embodiment illustrated in figure 2 the angle of inclination of the rear end side wall remote from the screening device 1 is smaller and the angle of inclination of the front end side wall close to the screening device 1 is larger. Therefore, the first shower pipe 7 is provided at a position near the upper end of the rear end side wall. Thus, the inclination angle of the front end side wall is designed to be larger, and the interference with the screening device 1 can be avoided. And the inclination angle design of the rear end side wall far away from the screening device 1 is smaller, the opening degree of the material receiving hopper 201 can be improved, and the feeding smoothness is further ensured.

The three first spray pipes 7 are fixed at the position of the side wall of the receiving hopper 201 close to the upper end, wherein the first spray pipe 7 correspondingly arranged with one of the left end side wall or the right end side wall is used for being communicated with a water source through a pipeline, and the tail end of the first spray pipe 7 correspondingly arranged with the other of the left end side wall or the right end side wall is closed or provided with a switch valve. In the embodiment illustrated in fig. 2, the first shower pipe 7 provided in correspondence with the left end side wall is used to communicate with a water source through a pipe, as a water inlet pipe, and an on-off valve is provided at the end of the first shower pipe 7 provided in correspondence with the right end side wall. Of course, the above arrangement may be reversed. The end of the first spray pipe 7 which is correspondingly arranged with the other of the left end side wall or the right end side wall is closed or provided with a switch valve which is in a normally closed state, so that the water flowing in the three first spray pipes 7 connected in series can only flow out through the spray outlet. When the switch valve is opened, the three first spray pipes 7 connected in series can be dredged, so that the blockage of the first spray pipes 7 to cause unsmooth water flow is avoided.

As shown in fig. 6 to 9, in another embodiment, the feeding device 2 may be a screw feeder, the bottom of the two side walls at the left and right ends are connected with a conveying channel 9, and a conveying screw 10 driven by a motor 11 is arranged in the conveying channel 9. In this embodiment, the left and right side walls parallel to the direction of conveyance of the sludge material to be treated are obliquely extended outward, while the front and rear side walls perpendicular to the direction of conveyance of the sludge material to be treated are vertically disposed, the motor 11 is fixed to the rear side wall, and the conveyance channel 9 passes through the front side wall and extends to above the sieving device 1. In this way, the sludge material to be treated moves forward in the conveying passage 9 by the driving action of the conveying screw 10 and falls down from the front end outlet.

Likewise, the second shower 8 may be one or more. In the embodiment where the second spraying pipe 8 is plural as shown in fig. 2, the plural second spraying pipes 8 may be arranged in parallel and extend in the moving direction of the sludge material on the sieving apparatus 2 (the left and right direction as shown in fig. 2). One end (left end as shown in fig. 2) of the plurality of second shower pipes 8 is connected to one trunk pipe, and the other end (right end as shown in fig. 2) is closed or provided with an on-off valve in a normally closed state.

As shown in fig. 8, in the embodiment where the second spraying pipe 8 is one, one end (left end as shown in fig. 8) of the second spraying pipe 8 is communicated with a main pipe, which can also be used for connecting the first spraying pipe 7, and the other end (left end as shown in fig. 8) is closed or provided with an on-off valve in a normally closed state.

The utility model discloses an equipment for being directed at silt carries out preliminary treatment is through setting up material feeding unit 2 and screw screening plant 1 to the cooperation spray assembly dilutes and washes the pending silt material in entering into material feeding unit 2 and screening plant 1, can reduce the adhesion of pending silt material, makes less adhesion even not adhere silt on the rubbish debris that obtains through the separation of screw screening plant 1, obtains comparatively clean rubbish debris. Therefore, the garbage sundries mixed in the sludge material to be treated can be removed efficiently, and the sludge can be effectively pretreated.

Because a plurality of screening screws 101 that screening plant 1 contains are in the rotating condition in the course of the work, therefore the silt material that awaits processing can not appear blockking up the condition in screening clearance, guarantees the continuation of screening operation. And, adopt screw screening plant 1, can be according to the pitch and the screening clearance of screening screw 101, come to realize the three-phase separation based on the particle size to the rubbish debris that mix in the pending silt material after diluting. Therefore, the fineness of the screening and the refining is higher.

Furthermore, since a plurality of sieving screws 101 are all involved in the sieving operation, the sludge material to be treated can be sieved relatively uniformly by the plurality of sieving screws 101. Therefore, the screening loads borne by the plurality of screening screws 101 are different by a small amount, and the problem of load concentration is avoided, thereby reducing the wear of intermediate transmission components such as a speed reducer for driving the screening screws 101 to rotate.

It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no order is shown between the two, and no indication or suggestion of relative importance is understood. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Claims (10)

1. An apparatus for pretreating sludge, comprising:

the screening device comprises a plurality of screening screws which are arranged in parallel, and screening gaps for discharging undersize materials are formed between every two adjacent screening screws at intervals;

the feeding device is positioned at the upstream of the screening device along the treatment process and is used for providing sludge materials to be treated for the screening device, and the feeding device comprises a receiving hopper used for receiving the sludge materials to be treated;

the spraying assembly is communicated with a water source through a pipeline and is provided with a spraying outlet, and the spraying outlet corresponds to the screening screw and the receiving hopper.

2. The apparatus of claim 1, wherein said receiving hopper comprises at least two oppositely disposed and angularly diverging sidewalls, and said spray assembly comprises a first spray pipe corresponding to at least a portion of said sidewalls and a second spray pipe disposed above said sifting screw.

3. The apparatus according to claim 2, wherein the spray outlet of the first spray pipe is a plurality of first through holes which are arranged at intervals along the axial direction and are directed to the side wall; the spraying outlet of the second spraying pipe is a plurality of second through holes which are arranged on the pipe wall of the second spraying pipe at intervals along the axial direction and point to the screening screw, and nozzles are arranged in the second through holes.

4. The apparatus according to claim 2, wherein at least two obliquely outwardly-flared side walls at left and right ends parallel to a conveying direction of the sludge material to be treated are provided with the first shower pipes, respectively, at positions near upper ends thereof.

5. The apparatus defined in claim 4 wherein the feeder means is a vibratory feeder comprising two pairs of inclined flared side walls; the side wall with the smaller inclination angle in the rear end side wall far away from the screening device and the front end side wall close to the screening device is also provided with first spray pipes at the positions close to the upper ends of the side walls, and the three first spray pipes are connected in series end to end.

6. The apparatus as claimed in claim 5, wherein the first shower pipe provided in correspondence with one of the left end side wall or the right end side wall is adapted to communicate with a water source through a pipe, and an end of the first shower pipe provided in correspondence with the other of the left end side wall or the right end side wall is closed or provided with an on-off valve.

7. The equipment as claimed in claim 2, characterized in that the feeding device is a screw feeder, a conveying channel is connected with the bottoms of two side walls which are obliquely and outwardly expanded at the left end and the right end which are parallel to the conveying direction of the sludge material to be treated, and a conveying screw rod driven by a motor is arranged in the conveying channel; the conveying channel penetrates through the side wall close to the front end of the screening device and extends to the upper part of the screening screw.

8. The apparatus of claim 1, wherein the screening device and the feeding device are carried on a frame, the frame having a cover plate at a top thereof for covering the screening device, the frame having side plates at an outer side thereof, the cover plate and the side plates forming an interior space for receiving the screening device therein, the side plates having viewing windows therein.

9. The apparatus of claim 8, wherein the top end of the frame is provided with an inclined striker plate having an inner end near the frame connection and an outer end remote from the frame, the outer end being higher than the inner end, the inner end extending into the receiving hopper.

10. The apparatus according to claim 1, wherein the receiving hopper is provided with a detecting element for detecting the moisture content of the sludge to be treated fed into the receiving hopper;

a pipeline for communicating the spraying assembly with a water source is provided with an on-off mechanism, and the on-off mechanism is connected with the detection element; and the detection element controls the on-off mechanism to be closed when detecting that the water content of the sludge to be treated reaches a preset threshold value.

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