Special screening machine for wet separation
By designing a segmented frame, gold-collecting chute, and waterproof sealed bearings, the problem of low efficiency in wet material screening equipment was solved, achieving efficient gold recovery and extended equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-10
AI Technical Summary
Existing screening machinery and equipment are inefficient under wet material conditions and cannot effectively separate placer gold from silt, resulting in a large loss of placer gold and waste of resources.
A wet screening machine was designed, which adopts a segmented frame and a 25% slope structure. It combines segmented connection of gold chute, waterproof sealed bearing, spray pipe and water gun pipe, gold-absorbing felt and multi-level sealing barrier are added, and the design of screening hole and power transmission system are optimized to achieve efficient screening and cleaning.
It improves the recovery rate and resource utilization of placer gold, extends the service life of equipment, ensures screening efficiency and cleaning effect, and reduces maintenance frequency.
Smart Images
Figure CN224101143U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of screening equipment, and specifically relates to a wet separation special screening machine. BACKGROUND
[0002] The wet separation special screening machine is used in the mining process of placer gold and can screen placer gold from sand, stones and the like. Screening and separation is a key link and process.
[0003] At present, various types of screening mechanical equipment used in placer gold production are basically grafted from other industries and formed by a self-formed method. Since the ore body is wet material, it has inherent properties such as viscosity, adhesion, stickiness, damping, and difficulty in decomposition and separation. The mechanical equipment that is not professional and suitable for separation operation under wet material conditions has low production efficiency, and cannot completely remove mud, wash clean and completely screen. Incomplete mud removal and washing can cause mud, sand and gold to be unable to be effectively decomposed and separated, resulting in a large amount of placer gold being lost with tailings and muddy water, and the placer gold being unable to be completely precipitated. For a long time, due to the backwardness of screening mechanical equipment technology, the production efficiency is low, and at the same time, a large amount of gold resources is lost and wasted.
[0004] Therefore, a wet separation special screening machine with high efficiency and high recovery is urgently needed. SUMMARY
[0005] The utility model aims at solving at least the above-mentioned defects and providing advantages to be explained later.
[0006] In order to realize these purposes and other advantages of the utility model, the wet separation special screening machine is provided, which comprises an overall framework, a screening machine, a placer gold chute, a water supply system and a power device.
[0007] The overall framework is composed of a rear framework of a material receiving platform part and a front framework of a screening machine part, and the rear framework and the front framework are connected through the placer gold chute. The platform surface of the rear framework is a 25% slope structure with a rear high and a front low, and the low end discharge port is connected with the screen surface inlet of the front framework. The upper side of the front framework is provided with a spraying water support. The front framework is provided with the screening machine.
[0008] The screening machine is connected below the front framework. The screening machine comprises a rectangular compartment type screen body. The front frame of the screening machine is a discharge port, and the rear frame is a feeding port. The screen surface is composed of a plurality of parallel arranged screen shafts. The screen disc pieces and the protective bushings are installed on each screen shaft in an interval. The screen disc pieces of adjacent screen shafts are arranged in a staggered manner to form screen holes. The both ends of the screen shaft are driven to rotate through the chain wheels and double chains. Waterproof sealing bearings and protective covers are arranged at the connection position of the screen shaft and the frame body. The collection chute is arranged below the screening machine.
[0009] The gold sluicing chute is connected below the aggregate chute; the gold sluicing chute includes a front gold sluicing chute and a rear gold sluicing chute, the front gold sluicing chute and the rear gold sluicing chute are respectively arranged below the front frame and the rear frame, the front gold sluicing chute and the rear gold sluicing chute are connected in sections in a slope manner to form a continuous tail sand discharging channel, and a funnel collector is arranged at an outlet end of the rear gold sluicing chute; the gold sluicing chute is communicated with the aggregate chute.
[0010] The water supply system comprises a water distributor, a water control disc valve, a soft water belt, three spray pipes and a water gun pipe, the water distributor is connected with a water source through a high-pressure water pump, the water distributor is provided with three water inlets; the spray pipe is provided with a strip-shaped water outlet, and the water gun pipe is provided with a plurality of spray openings; the three spray pipes and the water gun pipe are installed on a spray water support, and the water gun pipe is aligned with the rear frame platform.
[0011] The power device is arranged at the right side of the front frame; the power device comprises a single-cylinder diesel engine or an electric motor, a speed reducer and a shaft coupling, and drives the screen shaft to rotate synchronously.
[0012] In the above scheme, the segmented frame and the 25% slope design improve the material flow efficiency and avoid blockage; the gold sluicing chute is connected in sections to realize continuous discharge of tail sand. The screen shaft adopts waterproof sealing bearing and protective cover to reduce the intrusion of mud and water and prolong the service life of the bearing. The combination of the spray pipe and the water gun pipe expands the water flow coverage, which plays a role in water replenishment and cleaning. The gold suction felt is arranged in sections in the chute to slow down the water flow and increase the gold sluicing working surface to improve the recovery rate. Specifically, the single-cylinder diesel engine or the electric motor transmits torque to the speed reducer through a V-belt, the speed reducer outputs torque through the output shaft and the shaft coupling on the driving shaft of the screen machine after speed ratio, and drives the screen shaft to rotate synchronously. The water distributor and the power device are respectively connected on both sides of the front frame. The surface of the bushing is plated with a wear-resistant layer to improve the wear resistance, maintain the stable gap between the screen shaft and the screen disc, ensure the consistency of the screen hole size, reduce the maintenance frequency and reduce the operation cost.
[0013] Preferably, the gold sluicing chute is provided with a gold suction felt.
[0014] In the above scheme, the gold sluicing chute is additionally provided with a gold suction felt to increase the gold sand adsorption area, prolong the contact time and significantly improve the gold sand capture rate; in combination with the slope sectional design, the mud water flow rate is slowed down, the gold sand loss is reduced and the resource utilization rate is improved.
[0015] Preferably, the inner circle of the screen disc of the screen shaft is fixed with the key slot of the screen shaft through a key pin; the both ends of the screen shaft are provided with UCF212 maintenance-free bearings; a waterproof sealing ring is additionally arranged in the bearing seat; an O-ring is arranged at the middle part of the screen shaft penetrating through the side plate; rubber gaskets and waterproof plugs are arranged between the outer side surface of the side plate and the bearing and the side plate.
[0016] In the above scheme, the screen disc piece is fixed through the key pin and the key groove to enhance the connection stability and prevent the deformation of the screening hole. The UCF212 maintenance-free bearing is matched with the waterproof sealing ring, the rubber gasket and the waterproof O-shaped ring to form a multi-stage sealing barrier, effectively block the intrusion of mud and water, reduce the maintenance frequency and prolong the service life of the bearing. Specifically, all the side plates of the screen shaft are connected with the waterproof plug-in plate, thereby better prolonging the service life.
[0017] Preferably, the nozzles of the spray pipe are arranged at an angle of 45° with the pipeline; the spray ports of the water gun pipe cover the far, middle and near areas of the rear frame platform; the water distributor is provided with three independent water inlets and four controllable water outlets, and the water quantity is adjusted through the disc valve.
[0018] In the above scheme, the 45° inclination design of the spray nozzle of the spray pipe enlarges the spraying range and reduces the water pressure loss; the independent water inlet of the water distributor is matched with the controllable water outlet and the disc valve to realize accurate adjustment of the water quantity. The multiple spray ports of the water gun pipe cover the far, middle and near areas to improve the uniformity of the flushing and ensure sufficient cleaning of the materials.
[0019] Preferably, the screen surface of at least three screen shafts at the feed inlet of the screening machine is provided with a flow distribution toothed plate.
[0020] In the above scheme, the flow distribution toothed plate is arranged at the feed inlet to disperse the impact force of the large block materials, thereby reducing the impact of the stones on the screen shaft, protecting the screen shaft from damage, prolonging the service life of the screen shaft, maintaining the stability of the screening hole size and ensuring the consistency of the screening efficiency.
[0021] Preferably, the outer circle of the screen disc piece is provided with 8-9 diamonds.
[0022] In the above scheme, specifically, the screen disc is made of NM500∽NM600 material. The screen disc piece and the diamond are integrally formed, the outer circle of the screen disc piece is designed with 8-9 diamonds to enhance the stirring capacity of the materials, reduce the plugging of the screen hole and improve the screening efficiency; the diamond structure can delay the wear of the screen disc piece and prolong the replacement period.
[0023] Preferably, the screen surface includes a first screen surface and a second screen surface; the power device includes a first power device and a second power device; the first screen surface and the second screen surface are in a staggered structure with the rear high and the front low, and the end screen shaft of the first screen surface is located above the second screen surface; the screen shafts of the first screen surface and the second screen surface are connected with the first power device and the second power device, respectively.
[0024] In the scheme, the first screen surface and the second screen surface are staggered and arranged with the rear high and the front low, the material is naturally dropped into the second screen surface for secondary screening after being preliminarily screened by the first screen surface, the separation effect of gold sand and impurities is significantly improved, and the screening blind area is reduced; the first power device and the second power device can independently adjust the screen surface rotating speed or the screening parameter, flexibly cope with the material with different particle sizes or humidity, and enhance the adaptability of the equipment to different working conditions; the staggered structure optimizes the material flow path, avoids the problem of blockage caused by overload of a single screen surface; meanwhile, the double screen surfaces share the load, prolong the service life of the screen shaft and the screen disc piece; the secondary screening ensures that the gold sand is fully captured, reduces the loss of gold sand caused by incomplete single screening, and significantly improves the resource recovery rate.
[0025] Preferably, the gold sluicing chute is divided into two or three parallel chute bodies.
[0026] In the scheme, the gold sluicing chute is divided into 2-3 parallel chute bodies, the slurry treatment capacity is improved, and overflow is avoided.
[0027] Preferably, a cross coupling is arranged at the driving end of the screen shaft, and the cross coupling is connected with the speed reducer.
[0028] In the scheme, the cross coupling is arranged at the driving end of the screen shaft to connect the speed reducer, the rigidity of the transmission system is enhanced, the load change is adapted, the power transmission is avoided to be interrupted, and the stability of synchronous rotation of the screen shaft is ensured.
[0029] Preferably, protective covers are arranged outside the chain wheels and the chains at both ends of the screen shaft.
[0030] In the scheme, the protective covers are arranged outside the chain wheels and the chains, the slurry and dust are blocked from invading, the rust and wear are reduced, the service life of the transmission components is prolonged, and the operation safety is improved.
[0031] The advantages of the utility model are as follows:
[0032] Firstly, the receiving platform of the wet separation special screening machine is designed with a 25% slope, the material flow efficiency is properly maintained, and blockage is avoided; the gold sluicing chute is connected in sections to realize continuous discharge of tail sand. The screen shaft adopts waterproof sealing bearing and protective cover, the slurry invasion is reduced, and the service life of the bearing is prolonged. The spray pipe and the water gun pipe work cooperatively to expand the water flow coverage range and improve the material cleaning uniformity. The sluicing chute is provided with gold suction felt in sections, the gold sand contact time is increased, and the recovery rate is improved.
[0033] Secondly, the gold sluicing chute of the wet separation special screening machine is additionally provided with gold suction felt, the gold sand adsorption area is increased, the contact time is prolonged, and the gold sand capture rate is significantly improved; in combination with the slope sectional design, the slurry flow rate is slowed down, the gold sand loss is reduced, and the resource utilization rate is improved.
[0034] Moreover, the screen disc piece of the wet screening special screening machine is fixed through the key pin and the key groove, the connection stability is enhanced, and the screening hole is prevented from deforming.
[0035] Moreover, the spraying pipe nozzle of the wet screening special screening machine is designed to be inclined by 45 degrees to expand the spraying range and reduce water pressure loss; the water distributor independent water inlet is matched with the controllable water outlet and the disc valve to realize accurate water quantity adjustment. BRIEF DESCRIPTION OF DRAWINGS
[0036] Fig. 1 It is a front structure schematic view of the wet screening special screening machine of the utility model;
[0037] Fig. 2 It is a side structure schematic view of the wet screening special screening machine of the utility model;
[0038] Fig. 3 It is a top view of the wet screening special screening machine of the utility model;
[0039] Fig. 4 It is a connection structure schematic view of the screen shaft, the screen disc piece and the protection bushing in the wet screening special screening machine of the utility model;
[0040] Fig. 5 It is another front structure schematic view of the wet screening special screening machine of the utility model;
[0041] Fig. 6 It is another side structure schematic view of the wet screening special screening machine of the utility model;
[0042] The overall framework 1, the rear framework 11, the front framework 12, the spraying water support 121, the screening machine 2, the first screen surface A, the second screen surface B, the screen shaft 21, the screen disc piece 22, the protection bushing 23, the material collecting chute 24, the gold collecting chute 3, the front gold collecting chute 31, the rear gold collecting chute 32, the water supply system 4 and the power device 5. DETAILED DESCRIPTION
[0043] The utility model will be further explained in detail below, so that the person skilled in the art can implement according to the description text. EMBODIMENT
[0044] Figs. 1-4 An implementation form of the utility model is shown, and the wet screening special screening machine comprises an overall framework 1, a screening machine 2, a gold collecting chute 3, a water supply system 4 and a power device 5.
[0045] The overall frame 1 consists of a rear frame 11 of the receiving platform and a front frame 12 of the screening machine. The rear frame 11 and the front frame 12 are connected by a gold-lubricating chute 3. The platform surface of the rear frame 11 has a 25% slope structure with the rear higher than the front, and the lower end of the discharge port is connected to the screen inlet of the front frame 12. Spray water supports 121 are provided on both sides above the front frame 12. The screening machine 2 is installed inside the front frame 12.
[0046] Screening machine 2 is connected below the front frame 12; screening machine 2 includes a rectangular box-type screen body; the front frame of the screening machine is the discharge port and the rear frame is the inlet; the screen surface is composed of multiple parallel screen shafts 21; each screen shaft 21 is equipped with screen discs 22 and protective sleeves 23 at intervals, and the screen discs 22 of adjacent screen shafts 21 are staggered to form screening holes; the two ends of the screen shafts 21 are driven to rotate by sprockets and double chains; the two ends of the screen shafts 21 are connected to several double sprocket structures, and the several double sprocket structures respectively connect the two ends of adjacent screen shafts 21 in pairs; the connection between the screen shafts 21 and the frame is provided with waterproof sealed bearings and protective covers; a material collection chute 24 is provided below the screening machine 2.
[0047] The tailings sluice 3 is connected below the aggregate sluice 24; it includes a front tailings sluice 31 and a rear tailings sluice 32, which are respectively located on the lower layer of the front frame 12 and the rear frame 11. The front tailings sluice 31 and the rear tailings sluice 32 are connected in sloping sections to form a continuous tailings discharge channel. The outlet end of the rear tailings sluice 32 is equipped with a funnel collector; the tailings sluice 3 is connected to the aggregate sluice 24.
[0048] Water supply system 4 includes a water distributor, a water control disc valve, a soft water hose, three spray pipes and a water gun pipe. The water distributor is connected to the water source through a high-pressure water pump and has three water inlets. The spray pipes have strip-shaped spray nozzles and the water gun pipes have multiple spray nozzles. The three spray pipes and the water gun pipes are installed on the spray water support, and the water gun pipes are aligned with the rear frame platform.
[0049] The power unit 5 is located on the right side of the front frame; the power unit includes a single-cylinder diesel engine or electric motor, a reducer and a coupling, and the coupling is connected to a double sprocket structure to drive the screen shaft to rotate synchronously.
[0050] This implementation scheme improves material flow efficiency and prevents blockages through a segmented structure and a 25% slope design; the segmented connection of the gold-filling chute enables continuous discharge of tailings. The screen shaft uses waterproof sealed bearings and protective covers to reduce mud and water intrusion and extend bearing life. The combination of spray pipes and water gun pipes expands the water flow coverage, replenishing water for the mud and sand while also cleaning it. The gold-absorbing felt installed in the segments of the chute slows down the water flow and increases the working surface for gold filling, thereby improving the recovery rate.
[0051] Furthermore, each of the gold-collecting chute 3 is equipped with a gold-absorbing felt.
[0052] The embodiment adds the gold suction felt to the gold sluice to increase the gold sand adsorption area, prolong the contact time, and significantly improve the gold sand capture rate.
[0053] Further, the inner circle of the screen disc piece 22 of the screen shaft is fixed by a key pin and a key groove of the screen shaft; the two ends of the screen shaft 21 are provided with UCF212 maintenance-free bearings; a waterproof sealing ring is additionally installed in the bearing seat of the bearing; the screen shaft 21 is provided with an O-ring at the middle of the side plate, and rubber pads and waterproof plugs are arranged between the outer side of the side plate and the bearing and the side plate, and the corresponding side also has a waterproof plug.
[0054] The embodiment fixes the screen disc piece by a key pin and a key groove to enhance the connection stability and prevent the screen hole from deforming. The UCF212 maintenance-free bearing is matched with a waterproof sealing ring, rubber pads, and a waterproof O-ring to form a multi-stage sealing barrier, effectively block the intrusion of slurry, reduce the maintenance frequency, and prolong the service life of the bearing.
[0055] Further, the nozzles of the spray pipe are arranged at an inclination of 45° to the pipeline; the spray ports of the water gun pipe cover the far, middle, and near regions of the rear frame platform; the water distributor is provided with three independent water inlets and four controllable water outlets, and the water volume is adjusted by a disc valve.
[0056] The embodiment of the spray pipe nozzle is designed at an inclination of 45° to expand the spraying range and reduce the water pressure loss; the independent water inlets of the water distributor are matched with the controllable water outlets and a disc valve to realize accurate adjustment of the water volume. The multiple spray ports of the water gun pipe cover the far, middle, and near regions to improve the uniformity of the flushing and ensure sufficient cleaning of the materials.
[0057] Further, the screen surface of at least three screen shafts at the feed inlet of the screening machine 2 is provided with a flow distribution toothed plate.
[0058] The embodiment sets the flow distribution toothed plate at the feed inlet to disperse the impact force of the large block materials, thereby reducing the impact of the stones on the screen shaft, protecting the screen shaft from damage, prolonging the service life of the screen shaft, maintaining the stability of the screen hole size, and ensuring the consistency of the screening efficiency.
[0059] Further, the outer circle of the screen disc piece 22 is provided with 8-9 diamonds.
[0060] The embodiment, in particular, the screen disc is made of NM500∽NM600 material. The screen disc piece and the diamonds are integrally formed, the outer circle of the screen disc piece is designed with 8-9 diamonds to enhance the stirring capacity of the materials, reduce the blockage of the screen holes, and improve the screening efficiency; the diamond structure can delay the wear of the screen disc piece and prolong the replacement cycle.
[0061] Further, the screen surface comprises a first screen surface A and a second screen surface B; the power device 5 comprises a first power device 51 and a second power device 52; the first screen surface A and the second screen surface B are staggered structures with the rear high and the front low, and the end screen shaft of the first screen surface A is located above the second screen surface B; the screen shafts of the first screen surface A and the second screen surface B are connected with the first power device 51 and the second power device 52 respectively.
[0062] In this embodiment, the first screen surface and the second screen surface are staggered with the rear high and the front low, the material is naturally dropped into the second screen surface for secondary screening after being preliminarily screened by the first screen surface, the separation effect of gold and impurities is significantly improved, and the screening blind area is reduced; the first power device and the second power device can independently adjust the screen speed or the screening parameter, flexibly cope with the material with different particle sizes or humidity, and enhance the adaptability of the equipment to different working conditions; the staggered structure optimizes the material flow path, avoids the problem of blockage caused by overload of a single screen surface; at the same time, the double screen surfaces share the load, prolong the service life of the screen shaft and the screen disc piece; the secondary screening ensures that the gold is fully captured, reduces the loss of gold caused by incomplete single screening, and significantly improves the resource recovery rate.
[0063] In this embodiment, the gold sluicing chute is divided into two or three parallel groove bodies, the slurry treatment capacity is improved, and overflow is avoided.
[0064] Further, the cross coupling is arranged at the driving end of the screen shaft 21, and the cross coupling is connected with the speed reducer.
[0065] In this embodiment, the cross coupling is arranged at the driving end of the screen shaft, and the cross coupling is connected with the speed reducer, the rigidity of the transmission system is enhanced, the load change is adapted, the power transmission is avoided to be interrupted, and the stability of synchronous rotation of the screen shaft is ensured.
[0066] Further, the outer sides of the chain wheels and the chains at both ends of the screen shaft 21 are respectively provided with protective covers.
[0067] In this embodiment, the protective covers are additionally arranged at the outer sides of the chain wheels and the chains, the slurry and dust are blocked from invading, the rust and wear are reduced, the service life of the transmission components is prolonged, and the operation safety is improved.
[0068] Although the embodiments of the utility model have been disclosed as above, it is not limited to the application listed in the specification and the embodiments. It can be fully applied to various fields suitable for the utility model. For those skilled in the art, other modifications can be easily realized. Therefore, the utility model is not limited to specific details without departing from the general concept defined by the claims and the equivalent range.
Claims
1. A wet sorting dedicated screening machine, characterized in that, The utility model relates to a kind of sand screening machine, including: Integral framework, by the rear frame of material receiving platform part and the front frame of screen machine part, the rear frame is connected with the front frame by gold slide chute;The platform surface of rear frame is 25% slope structure of rear high front low, low end discharge port is connected with the screen surface entrance of front frame;The upper side of front frame is equipped with spray water support; Screen machine, which is connected below the front frame;Screen machine includes rectangular compartment type screen body;The front frame of screen machine is discharge port, and the rear frame is feed inlet;Screen surface is composed of multiple parallel arranged screen shafts;Screen disc piece and protection bushing are installed on each screen shaft with interval;Screen disc piece of adjacent screen shafts is staggered arrangement and forms screening hole;The both ends of screen shaft are driven to rotate by chain wheel and double chain;The both ends of screen shaft are matched and connected with several double chain wheel structures, and several double chain wheel structures are connected with the both ends of adjacent screen shafts two by two;Waterproof sealed bearing and protective cover are arranged at the connection between screen shaft and frame body;Collecting chute is arranged below screen machine; Gold slide chute, which is connected below collecting chute;Including front gold slide chute and rear gold slide chute, front gold slide chute and rear gold slide chute are arranged in lower layer of front frame and rear frame respectively, front gold slide chute and rear gold slide chute are connected in slope section, and continuous tail sand discharge channel is formed, and outlet end of rear gold slide chute is equipped with hopper collector;Gold slide chute is communicated with collecting chute; Water supply system, including water distributor, water control disc valve, soft water belt, 3 spray pipes and water gun pipe, water distributor is connected with water source by high-pressure water pump, and water distributor is equipped with three water inlets;Spray pipe is equipped with strip-shaped water outlet, and water gun pipe is equipped with multiple spray openings;3 spray pipes and water gun pipe are installed on spray water support, and water gun pipe is aimed at rear frame platform; Power device, which is arranged on the right side of front frame;Power device includes single-cylinder diesel engine or motor, speed reducer and coupling, coupling is connected with double chain wheel structure to drive screen shaft to rotate synchronously.
2. The wet-only, dedicated screening machine of claim 1, wherein, The gold slide chute is equipped with gold suction felt.
3. The wet-only, dedicated screening machine of claim 1, wherein, The inner circle of screen disc piece of screen shaft is fixed with key pin and key groove of screen shaft;UCF212 maintenance-free bearing is arranged at both ends of screen shaft;Waterproof sealing ring is arranged in bearing seat of bearing;O-ring is arranged at the middle of screen shaft penetrating side plate, and rubber pad and waterproof plugboard are arranged between the outer side of side plate and bearing and side plate.
4. The wet-only, dedicated screening machine of claim 1, wherein, The nozzle of spray pipe is arranged at 45° inclination with pipeline;The spray opening of water gun pipe covers far, middle and near areas of rear frame platform;Water distributor is equipped with three independent water inlets and four controllable water outlets, and water amount is adjusted by disc valve.
5. The wet-only, dedicated screening machine of claim 1, wherein, The screen surface of at least three screen shafts at feed inlet of screen machine is equipped with shunt toothed plate.
6. The wet-only, dedicated screening machine of claim 1, wherein, The outer circle of screen disc piece is equipped with 8-9 rhombuses.
7. The wet-only, dedicated screening machine of claim 1, wherein, The screen surface includes first screen surface and second screen surface;Power device includes first power device and second power device; The first screen surface and the second screen surface are staggered structure of rear high front low, and the terminal screen shaft of the first screen surface is above the second screen surface; The screen shafts of the first screen surface and the second screen surface are connected with the first power device and the second power device respectively.
8. The wet-only, dedicated screening machine of claim 1, wherein, The gold slide chute is divided into two or three parallel groove bodies.
9. The wet-only, dedicated screening machine of claim 1, wherein, The driving shaft end of screen shaft is equipped with cross coupling, and the cross coupling is connected with speed reducer.
10. The wet-only, dedicated screening machine of claim 1, wherein, Protective cover is arranged at the outside of chain wheel and chain at both ends of screen shaft.