CN112275009A - Multistage variable-vibration rock debris cleaning, screening and filtering device - Google Patents

Multistage variable-vibration rock debris cleaning, screening and filtering device Download PDF

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Publication number
CN112275009A
CN112275009A CN201910669131.1A CN201910669131A CN112275009A CN 112275009 A CN112275009 A CN 112275009A CN 201910669131 A CN201910669131 A CN 201910669131A CN 112275009 A CN112275009 A CN 112275009A
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CN
China
Prior art keywords
vibration
water tank
rock debris
screen cloth
screening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910669131.1A
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Chinese (zh)
Inventor
张多文
明晓峰
赵明
刘沙
桂成梁
姬生震
孙道武
葛瑞全
王强
黄红涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinopec Oilfield Service Corp
Sinopec Shengli Petroleum Engineering Corp
Geological Logging Co of Sinopec Shengli Petroleum Engineering Corp
Original Assignee
Sinopec Oilfield Service Corp
Sinopec Shengli Petroleum Engineering Corp
Geological Logging Co of Sinopec Shengli Petroleum Engineering Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinopec Oilfield Service Corp, Sinopec Shengli Petroleum Engineering Corp, Geological Logging Co of Sinopec Shengli Petroleum Engineering Corp filed Critical Sinopec Oilfield Service Corp
Priority to CN201910669131.1A priority Critical patent/CN112275009A/en
Publication of CN112275009A publication Critical patent/CN112275009A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D33/00Filters with filtering elements which move during the filtering operation
    • B01D33/01Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
    • B01D33/03Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements
    • B01D33/0346Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements
    • B01D33/0376Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with vibrating filter elements with flat filtering elements supported
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D33/00Filters with filtering elements which move during the filtering operation
    • B01D33/58Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/60Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing

Abstract

The utility model provides a multistage variable vibration detritus cleaning sieve worry device, includes water tank, screen cloth, vibrating motor, shakes the board, and the water tank passes through the vibration vaulting pole to be set up in shaking the board top, and vibrating motor sets up on shaking the board, shakes the board below and is provided with damping support piece, it is protruding stupefied still to be provided with a plurality of supports of arranging along water tank length direction between screen cloth and the water tank bottom, and the screen cloth is placed on supporting protruding stupefied, it reduces in proper order to support protruding stupefied height and makes the screen cloth have certain slope, support protruding stupefied with the even division of space between screen cloth and the water tank bottom be a plurality of subregion. According to the invention, the vibration transmission efficiency and the adjustability are improved through the combination of the vibration base, the vibration support rod and the vibration variation column, the vibration excitation effect is improved through the wavy structure of the bottom surface of the water tank, rock debris with different particle diameters is screened, washed and classified, and the working efficiency is improved.

Description

Multistage variable-vibration rock debris cleaning, screening and filtering device
Technical Field
The invention relates to the field of rock debris screening and filtering equipment, in particular to a multistage variable-vibration rock debris cleaning, screening and filtering device.
Background
The drilling fluid vibrating screen is an important solid control device, is also a foundation and fundamental device for carrying out rock debris fishing in geological logging, and can not fish rock debris when the drilling fluid is left from the geological logging of the vibrating screen in drilling with the drilling fluid as a medium. The drilling fluid carries the detritus broken through the shaft bottom drill bit and returns out the well head, then flows through the overhead tank and enters into the buffer tank, and the drilling fluid enters the buffer tank and is advanced high-altitude, just enters into on the shale shaker from the eminence outflow. The vibrating screen has screen cloth with various screen meshes for replacement according to the requirement of liquid-solid separation, but the screen cloth on the same surface is only provided with the screen meshes with the same rule, so that the aim of liquid-solid separation is realized by arranging the same screen meshes, and the vibrating screen is also arranged aiming at that the rock debris crushed by the conventional drill bit is basically uniform particles. The rock debris particles carried by the drilling fluid are filtered out of free drilling fluid after passing through the vibrating screen, only the rock debris particles and the drilling fluid coated on the surfaces of the particles are vibrated to fall into the sand receiving basin from the vibrating screen, and then the rock debris particles and the drilling fluid are cleaned and prepared by geological logging personnel, which is a basic flow of geological logging sand-pumping work. However, with the popularization and application of new drilling fluid technology, such as PDC (polycrystalline diamond compact) micro-coring technology, the returned rock debris is no longer uniform fine particles, and meanwhile, along with a cylindrical rock core column, in such a case, the conventional rock debris fishing mode cannot meet the requirements of the new drilling technology, and the existing defects are gradually revealed, so that the deep homing of the rock debris is influenced.
In summary, the conventional rock debris fishing and screening device has the following disadvantages:
(1) the common vibrating screen is only suitable for liquid-solid separation of rock debris particles with uniform particle size and similar shapes, and the application range of the liquid-solid separation is very limited;
(2) when the common vibrating screen is used for screening rock debris, the rock debris cannot be sorted and separated on the screen surface according to the rock debris return time sequence, and the rock debris is mixed on the vibrating screen and is not favorable for deep homing;
(3) the geological logging has no self debris screening device and has no selectivity in a special working environment;
(4) the rock debris is returned out without time sequence, and is stirred and cleaned without time sequence to be more mixed, so that the rock debris in the limited depth is not really identified;
(5) the rock debris fishing and cleaning procedures are discontinuous, organic unification is not realized, repeated labor is caused, the labor intensity is increased, and meanwhile, the efficient application of clear water resources is not facilitated;
(6) the conventional vibrating screen is a set device, has poor variability and adjustability, and cannot realize the combination on mechanical vibration;
(7) the equipment has high operation cost and is not beneficial to the conversion of new and old kinetic energy.
Disclosure of Invention
The invention aims to provide a multistage variable-vibration rock debris cleaning and screening device aiming at the problems in the prior art.
The technical scheme is as follows:
the utility model provides a multistage variable vibration detritus cleaning sieve worry device, includes water tank, screen cloth, vibrating motor, shakes the board, and the water tank passes through the vibration vaulting pole to be set up in shaking the board top, and vibrating motor sets up on shaking the board, shakes the board below and is provided with damping support piece, it is protruding stupefied still to be provided with a plurality of supports of arranging along water tank length direction between screen cloth and the water tank bottom, and the screen cloth is placed on supporting protruding stupefied, it reduces in proper order to support protruding stupefied height and makes the screen cloth have certain slope, support protruding stupefied with the even division of space between screen cloth and the water tank bottom be a plurality of subregion.
Further, the mesh size of the screen is sequentially reduced along the decrease of the gradient of the screen. The lower end of the vibration support rod is also connected with an elastic support leg. The height of the supporting convex ribs is reduced along the length direction of the water tank in sequence. The height of the supporting convex edges is reduced along the diagonal direction of the water tank in sequence. A water inlet is formed in the side wall of the water tank close to the higher end of the screen, and a water outlet is formed in the side wall of the water tank close to the lower end of the screen. The water tank and the vibrating plate are also provided with a variable vibration column, the variable vibration column comprises a telescopic rod, an upper spring and a lower spring, the upper end of the telescopic rod is connected with the upper spring and then connected with the water tank, and the lower end of the telescopic rod is connected with the lower spring and then connected with the vibrating plate. The telescopic rod comprises a wire barrel, an upper wire rod and a lower wire rod, the upper wire rod and the lower wire rod are in threaded connection with the wire barrel, and the thread directions of the upper wire rod and the lower wire rod are opposite. And a rotating handle is arranged on the outer wall of the wire barrel. The upper spring is a tension spring, and the lower spring is a compression spring.
The invention has the beneficial effects that:
(1) the limitation that the common vibrating screen is only suitable for liquid-solid separation work of rock debris particles with uniform particle size and similar shapes is eliminated, and the application range of liquid-solid separation is expanded;
(2) the multistage variable-vibration rock debris cleaning, screening and filtering device can perform sequencing and separation on the screen surface according to the rock debris return time sequence when screening and filtering rock debris, so that the rock debris is not mixed on the vibrating screen any more, and deep homing is facilitated;
(3) the geological logging is provided with a self rock debris screening device, so that the selectivity in a special working environment is enriched;
(4) the multistage variable-vibration rock debris cleaning, screening and filtering device overcomes the defects that the rock debris of the common vibrating screen is not returned in a time sequence and is mixed more through the time sequence-free stirring and cleaning, and is beneficial to the real identification of the rock debris in a limited depth;
(5) the multistage variable-vibration rock debris cleaning and screening device realizes continuous rock debris fishing and cleaning procedures, organically unifies fishing and cleaning work, eliminates repeated labor, reduces labor intensity, and is beneficial to efficient application of clear water resources;
(6) the screen surface variability and the dynamic adjustability of the multistage variable-vibration rock debris cleaning and screening device are strong, and the combination is realized on the mechanical vibration;
(7) the equipment has low running cost and is beneficial to the conversion of new and old kinetic energy.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic of a screen slope;
FIG. 3 is a schematic illustration of a screen mesh partition;
FIG. 4 is a schematic view of the structure of the water inlet tank;
in the figure: 1-vibration motor, 2-vibration plate, 3-water tank, 4-screen, 41-coarse mesh, 42-middle mesh, 43-fine mesh, 5-support convex ridge, 6-water inlet, 61-water inlet groove, 611-square tube, 612-grid, 7-water outlet, 8-vibration support rod, 81-support rod, 82-vibration spring, 9-vibration-variable column, 91-tension spring, 92-telescopic rod, 93-pressure spring and 10-vibration-reduction support member.
Detailed Description
The first embodiment is as follows:
please refer to fig. 1, which illustrates a multi-stage vibration-variable debris cleaning, screening and filtering apparatus, comprising a rectangular water tank 3 with an open upper portion, a screen 4, a vibration motor 1, and a rectangular vibration plate 2.
Vibrating motor 1 sets up in 2 tops of shaking board through the bolt fastening, shakes the fixed damping support piece 10 that is provided with in four corners below of board 2, damping support piece 10 includes damping spring post or rubber column, and the fixed vibration vaulting pole 8 that is provided with in four corners below of water tank 3, vibration vaulting pole 8 is connected with the elasticity spike, elasticity spike and the board 2 fixed connection that shakes, the elasticity spike includes vibrating spring 82 or rubber column.
Still be provided with the protruding stupefied 5 of a plurality of supports of arranging along 3 length direction of water tank between screen cloth 4 and the 3 bottoms of water tank, screen cloth 4 places on supporting protruding stupefied 5, the height that supports protruding stupefied 5 reduces in proper order or reduces in proper order along 3 length direction of water tank, and the screen cloth 4 slope changes along with it, support protruding stupefied 5 simultaneously with the even partition of space between screen cloth 4 and the 3 bottoms of water tank be a plurality of subregion.
The size of the mesh on the screen 4 is reduced in accordance with the decrease in the gradient of the screen 4 in turn for each division, and is divided into three divisions including a coarse mesh 41, a middle mesh 42, and a fine mesh 43.
A water inlet 6 is arranged on the side wall of the water tank 3 close to the end with the higher gradient of the screen 4, and a water outlet 7 is arranged on the side wall of the water tank 3 close to the end with the lower gradient of the screen 4.
The water tank 3 and shake and still be connected with between the board 2 and become the post 9 that shakes, every is to setting up a post 9 that becomes to shake respectively in the middle of the vibration vaulting pole 8, including telescopic link 92, upper spring, lower spring, the upper spring is extension spring 91, the lower spring is pressure spring 93, is connected with water tank 3 after connecting the upper spring on telescopic link 92, and the lower spring is connected down to the lower extreme of telescopic link 92 after being connected with the board 2 that shakes.
The telescopic rod 92 comprises a wire barrel, an upper wire rod and a lower wire rod, a rotating handle is arranged on the outer wall of the wire barrel, the upper wire rod and the lower wire rod are in threaded connection with the wire barrel, the thread directions of the upper wire rod and the lower wire rod are opposite, and the upper wire rod and the lower wire rod are driven to move oppositely when the wire barrel rotates, so that the tension force between the water tank 3 and the vibrating plate 2 is adjusted, and the amplitude of the water tank 3 is adjusted.
Example two:
a multi-stage variable-vibration rock debris cleaning, screening and filtering device comprises an excitation device and a screening and washing device, and is integrally made of stainless steel.
The vibration excitation device comprises a vibration damping support piece 10, a vibration plate 2, a vibration motor 1, a vibration stay bar 8 and a vibration changing column 9.
The screening and washing device comprises a water tank 3 and a screen 4.
The vibrating plate 2 is a machine body for transmitting vibration, the vibrating plate 2 is a stainless steel plate, the length is 1000mm, the width is 500mm, the thickness is 6mm, and a vibration transmission part is arranged on the vibrating plate 2: the motor 1 is vibrated. The vibration motor 1 is an excitation motor and is arranged on a motor base, and the motor base is placed at the center of the vibration plate 2 and is fixed with the vibration plate 2 through screws; ② vibrating the brace rod 8. The vibration support rod 8 is arranged between the water tank 3 and the vibration plate 2, is respectively connected with four corners of the water tank 3 and the vibration plate 2 and is used for transmitting vibration and supporting the water tank 3, and is formed by welding a support rod 81 and a vibration spring 82. And thirdly, a vibration-variable column 9. A variable vibration column 9 is arranged between every two vibration support rods 8, four variable vibration columns 9 are mounted in total, and the variable vibration columns 9 are elastic force adjusting devices and are also used as connecting and separating devices of the vibration plate 2 and the water tank 3. The vibration-variable column 9 comprises a screw thread column, a screw thread cap and a vibration-variable spring. The screw column is an external screw of the steel column, the internal screw of the screw cap vehicle is screwed, the screw column and the screw cap are spirally matched, and the upper end and the lower end of the screw column are respectively and fixedly connected with a variable vibration spring. The vibration-variable spring comprises a pressure spring 93 and a tension spring 91, the positions can be changed up and down according to actual needs, the spinning columns are 150mm long and 40mm in diameter, the upper spinning column and the lower spinning column are screwed in and out of the spinning cap in a sleeved mode, the elastic force of the spring is changed, the upper portion and the lower portion of the spinning cap are respectively provided with a back cap, and the back caps are used for fixing the adjusted spinning cap. The maximum rotation distance of the screw cap is set to be 100mm, namely the total static height of the vibration changing column 9 is equal to the height of the vibration support rod 8, the heights of the vibration spring 82 and the vibration changing spring can be adjusted in real time according to needs, and the overall elastic change can be realized by selecting springs with different heights so as to increase or reduce the elastic force in each direction. Four corners of the bottom of the vibrating plate 2 are respectively provided with a vibration damping supporting piece 10.
Damping support piece 10, including damping spring, the whole board 2 that shakes of bearing, damping support piece 10 comprises fixed disk, seat bowl and damping spring. The diameter of the fixed disk is 120mm multiplied by the thickness of 10mm, and the fixed disk can be fixed on the base by drilling or welding according to the needs of a fixing mode. The seat bowl on the vibration reduction support piece 10 is welded and fixed with the base, the outer diameter of the seat bowl is 80mm, the wall thickness is 8mm, the height is 60mm, the upper seat bowl is welded with the vibration plate 2 or fixed through a screw hole, and the vibration spring 82 is placed in the seat bowl. The vibration damping support 10 is designed into an elastic structure, so that the overall elastic vibration can be increased, and the combination of the auxiliary vibration variation column 9 and the vibration stay bar 8 is beneficial to vibration distribution and transmission.
A water tank 3. The water tank 3 is fixed on the fixed disks at the tops of the four support rods 81 and the four vibration changing columns 9 by welding or screw holes. The water tank 3 is 1000mm long, 500mm wide, 6mm thick and 200mm high, the bottom is corrugated plate, the middle part of the cavity is welded with support convex ribs 5 which are used as the foundation for the cushion of the screen 4, and the cavity below the support plate is used as the cleaning water cavity. The length of the bottom plate of the water tank 3 is 800mm and is corrugated, and the other 200mm is a flat plate. (ii) a water inlet 6. A water inlet groove 61 is arranged at the position of the water inlet 6, the water inlet groove 61 is arranged at the bottom of one side surface of the water tank 3 and comprises a square pipe 611 and a grid 612, and the outer length is 400mm, the width is 30mm, the height is 30mm, the wall thickness is 3 mm. One side surface of the square pipe 611 is open, a grille 612 is welded on the open, corresponding to the water inlet 6 of the water tank 3, one end of the square pipe 611 is provided with a cleaning water inlet, the other end of the square pipe 611 is sealed by a welding seal plate, high-pressure cleaning water enters the square pipe 611 from the cleaning water inlet, the high-pressure cleaning water flows into the water tank 3 after being crushed by the grille 612, the undulation force of the flow fluctuation of the corrugated plate is increased, the vibrating cleaning water flow is formed under the action of vibration, and the cleaning water flows out from the water outlet; ② a water outlet 7. The water outlet 7 is arranged in the middle of the flat plate and is funnel-shaped, the diameter of an upper opening is 100mm, the diameter of a lower opening is 60mm, the height of the lower opening is 100mm, the lower opening can be welded with a section of steel pipe, a valve is installed on the steel pipe, then a drain pipe is connected to the steel pipe, the water outlet speed can be controlled through the valve, and washing sewage is drained and concentrated through the drain pipe; and thirdly, a valve. The other side surface of the water tank 3 is designed to be a valve structure, the height of the valve is 100mm, the lower 100mm is a water cavity body, and the hinge folding lock pin is fixed to be used for cleaning and collecting rock debris on the screen 4 after screening and cleaning.
The screen 4 is 988mm long by 488mm wide, the edge of the screen is attached to the inner wall of the water tank 3 and is irregularly inclined according to one direction, and meshes with different apertures and different shapes are arranged on the screen 4 according to the irregular inclined plane in different inclined intervals so as to realize directional vibration separation and sequencing of different particles. The screen cloth 4 is placed on the supporting plate, the four sides are pressed and fixed by the pressing plates, the shape of the pressing plates and the inclined surface of the screen cloth 4 are sewn, and the pressing plates are fixed by wing nuts and screw threads in screw holes in the surrounding frame.
A seat bowl is installed below the vibration reduction supporting piece 10, the vibration support rod 8 and the vibration changing column 9, and a spring is fixed through the seat bowl and can be welded and fixed in the seat bowl. The seat bowl comprises circular bowl seat and cylindrical spring sleeve, the spring of damping support piece 10, vibration vaulting pole 8, variable vibration post 9 can fixed mounting in the spring sleeve.
The vibration damping support piece 10, the vibration support rod 8 and the variable vibration column 9 are all welded with a fixed disc, and are fixedly connected with the vibration plate 2 or the water tank 3 through the fixed disc. The fixed disk is a steel disk, and the surrounding edge is provided with four screw holes.
The working principle is as follows:
the vibration plate 2 is supported by the vibration reduction supporting piece 10, so that the vibration motor 1 is maximally excited, the vibration is transmitted to the whole water tank 3 through the combined vibration and transmission of the vibration plate 2, the vibration reduction supporting piece 10, the supporting rod 81 and the vibration variation column 9, and the whole vibration amplitude change can be realized by adjusting the tightness of the vibration variation column 9; the combined application of the tension spring 91 and the compression spring 93 enriches the vibration mechanism; the corrugated plate has an excitation effect on cleaning water flow, the screen 4 structure with multi-stage mesh diameters is arranged to enable rock debris to be cleaned and then to be sequenced in a certain way, and the multi-stage variable-vibration rock debris cleaning and screening device realizes a novel rock debris cleaning and screening process and method through linkage and combined excitation.

Claims (10)

1. The utility model provides a multistage variable vibration detritus cleaning sieve worry device, includes water tank, screen cloth, vibrating motor, shakes the board, and the water tank passes through the vibration vaulting pole to be set up in the board top of shaking, and vibrating motor sets up on shaking the board, shakes the board below and is provided with damping support piece, characterized by, it is stupefied still to be provided with a plurality of supports of arranging along water tank length direction between screen cloth and the water tank bottom, and the screen cloth is placed on supporting protruding stupefied, the protruding stupefied height of support reduces in proper order and makes the screen cloth have certain slope, support protruding stupefied with the even division of space between screen cloth and the water tank bottom be a plurality of subregion.
2. The apparatus as claimed in claim 1, wherein the screen mesh size is reduced in order of decreasing screen slope.
3. The multi-stage variable vibration rock debris cleaning, screening and filtering device as claimed in claim 1, wherein the lower end of the vibration stay bar is further connected with an elastic supporting leg.
4. The multistage vibration rock debris cleaning, screening and filtering device as claimed in claim 1, 2 or 3, wherein the heights of the supporting ribs are sequentially reduced along the length direction of the water tank.
5. The multistage vibration rock debris cleaning and screening device as claimed in claim 1, 2 or 3, wherein the heights of the supporting ribs are sequentially reduced along the diagonal direction of the water tank.
6. The apparatus as claimed in claim 5, wherein the water inlet is formed on the sidewall of the water tank near the higher end of the screen, and the water outlet is formed on the sidewall of the water tank near the lower end of the screen.
7. The multi-stage variable-vibration rock debris cleaning, screening and filtering device as claimed in claim 6, wherein a variable-vibration column is further arranged between the water tank and the vibrating plate, the variable-vibration column comprises a telescopic rod, an upper spring and a lower spring, the upper end of the telescopic rod is connected with the upper spring and then connected with the water tank, and the lower end of the telescopic rod is connected with the lower spring and then connected with the vibrating plate.
8. The multi-stage variable-vibration rock debris cleaning, screening and filtering device as claimed in claim 7, wherein the telescopic rod comprises a wire barrel, an upper wire rod and a lower wire rod, the upper wire rod and the lower wire rod are in threaded connection with the wire barrel, and the thread directions of the upper wire rod and the lower wire rod are opposite.
9. The apparatus as claimed in claim 8, wherein the outer wall of the screw cylinder is provided with a rotary handle.
10. The multi-stage vibration-variable rock debris cleaning, screening and filtering device as claimed in any one of claims 6 to 8, wherein the upper spring is a tension spring, and the lower spring is a compression spring.
CN201910669131.1A 2019-07-24 2019-07-24 Multistage variable-vibration rock debris cleaning, screening and filtering device Pending CN112275009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910669131.1A CN112275009A (en) 2019-07-24 2019-07-24 Multistage variable-vibration rock debris cleaning, screening and filtering device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910669131.1A CN112275009A (en) 2019-07-24 2019-07-24 Multistage variable-vibration rock debris cleaning, screening and filtering device

Publications (1)

Publication Number Publication Date
CN112275009A true CN112275009A (en) 2021-01-29

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ID=74418648

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910669131.1A Pending CN112275009A (en) 2019-07-24 2019-07-24 Multistage variable-vibration rock debris cleaning, screening and filtering device

Country Status (1)

Country Link
CN (1) CN112275009A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113680668A (en) * 2021-10-20 2021-11-23 湖州师范学院 Multilayer pulse environment-friendly vibration cleaning sieve for grains

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113680668A (en) * 2021-10-20 2021-11-23 湖州师范学院 Multilayer pulse environment-friendly vibration cleaning sieve for grains

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