CN209953354U - Cleaning device for sand-stone separator - Google Patents
Cleaning device for sand-stone separator Download PDFInfo
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- CN209953354U CN209953354U CN201920413070.8U CN201920413070U CN209953354U CN 209953354 U CN209953354 U CN 209953354U CN 201920413070 U CN201920413070 U CN 201920413070U CN 209953354 U CN209953354 U CN 209953354U
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- cleaning device
- connecting rod
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- cleaning
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Abstract
The utility model is suitable for the technical field of sand separators, and provides a cleaning device for a sand separator, which comprises a guide device, a screening device, a cleaning device and a displacement device, wherein the guide device is positioned above the screening device and is connected with a water inlet pipe; the cleaning device comprises a plurality of drain pipes and a cleaning head, the cleaning head is movably connected with the drain pipes, a moving plate is sleeved on the cleaning head, circulating moving devices are mounted at two ends of the moving plate and comprise power parts and rotating wheels connected with the power parts, and symmetrical protruding structures are arranged on the rotating wheels; the displacement device comprises a moving block, an eccentric part, a first connecting rod and a second connecting rod, the first connecting rod is movably connected with the moving block, a limiting seat is sleeved on the moving block, an elastic part is installed between the moving block and the limiting seat, and the moving block is connected with the cleaning device through a synchronizing rod. Therefore, the utility model discloses can effectively wash the grit, improve the screening quality in the grit screening process.
Description
Technical Field
The utility model relates to a sand and stone separator technical field especially relates to a belt cleaning device for sand and stone separator.
Background
The sand-stone separator mainly comprises six parts, namely a feeding tank, a stirring separator, a water supply system, a screening system, a slurry-water homogenizing system, a recycling system and a waste slurry recycling system. And after the residual concrete and water enter the trough, continuously injecting circulating water, and allowing the mixed slurry to enter a separator along with a water feeding hole under the impact of water flow so as to sufficiently clean the residual concrete. The cement slurry water continuously flows out from a slurry outlet at the bottom of the separator and flows into the slurry pool through the slurry guide groove. The sand and the stones which are cleaned are pushed by the helical blades in the stirring separator, and then fall into the material pool through respective discharge ports after being separated. The cement slurry flowing into the slurry tank from the slurry tank is mixed with the concrete according to the specified proportion by an overlay method, and the separated sand, stone and slurry are reused. When separating sand and stone, enough water is needed for flushing. When washing the grit, generally adopt fixed water pipe to erode it, it is fixed to erode the area, and the grit of avris can't effectively wash.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
To foretell defect, the utility model aims to provide a belt cleaning device for grit separator, it can effectively wash the grit, guarantees grit separation quality.
In order to achieve the purpose, the utility model provides a cleaning device for a sand-stone separator, which comprises a material guiding device, a screening device, a cleaning device and a displacement device, wherein the material guiding device is positioned above the screening device and is connected with a water inlet pipe, and the water outlet end of the water inlet pipe is respectively connected with the material guiding device and the cleaning device; the cleaning device comprises a plurality of drain pipes and a plurality of cleaning heads positioned on the drain pipes, the cleaning heads are movably connected with the drain pipes, a movable plate is sleeved on the cleaning heads, circulating moving devices are installed at two ends of the movable plate and comprise power parts and rotating wheels connected with the power parts, symmetrical protruding structures are arranged on the rotating wheels, and the protruding structures positioned at two ends of the movable plate are distributed in a staggered mode; the displacement device comprises a moving block, an eccentric part, a first connecting rod and a second connecting rod which are movably connected with each other, the first connecting rod is movably connected with the moving block, the second connecting rod is abutted against the eccentric part, the eccentric part is connected with a motor, a limiting seat is sleeved on the moving block, an elastic part is installed between the moving block and the limiting seat, and the moving block is connected with a cleaning device through a synchronizing rod.
According to the utility model discloses a belt cleaning device for sand and stone separator, belt cleaning device still includes the casing, be equipped with the support column on the casing, just the support column is located the movable plate below.
According to the utility model discloses a belt cleaning device for sand and stone separator, be equipped with the pulley on the support column, the pulley passes through rotation axis joint support post, just pulley butt movable plate.
According to the utility model discloses a belt cleaning device for sand and stone separator, five are installed to the swiveling wheel, and it passes through fixed axle connection power spare.
According to the utility model discloses a belt cleaning device for grit separator, the crisscross distribution of protruding structure of adjacent swiveling wheel.
According to the utility model discloses a belt cleaning device for sand and stone separator, be equipped with two protruding structures on the single swiveling wheel, just protruding structure is the arc setting.
According to the utility model discloses a belt cleaning device for sand and stone separator, the guide device is the toper setting, just inlet tube one end is located guide device top avris.
According to the utility model discloses a belt cleaning device for sand and stone separator, sieving mechanism includes the support frame and is located the screen cloth of support frame top, the fixing base is connected through the elastic component in the support frame both ends.
According to the utility model discloses a belt cleaning device for sand and stone separator, displacement device still includes the shell, the movable block below is equipped with the shifting chute, just spacing seat is equipped with the guide post that matches with the shifting chute, the elastic component cup joints the guide post, just the elastic component is the spring, spacing seat fixed connection shell.
According to the utility model discloses a belt cleaning device for sand and stone separator, a fixed block is connected through the third connecting rod to the second connecting rod, fixed block fixed connection shell, second connecting rod and third connecting rod junction both sides are equipped with left locating part and right locating part.
The utility model provides a cleaning device for a sand-stone separator, which comprises a guide device, a screening device, a cleaning device and a displacement device, wherein the guide device is positioned above the screening device, the guide device is connected with a water inlet pipe, the water outlet end of the water inlet pipe is respectively connected with the guide device and the cleaning device, sand-stone on the screening device is washed by the water inlet pipe, soil on the surface of the sand-stone is washed away, and the subsequent separation quality of the sand-stone is ensured; the belt cleaning device includes a plurality of drain pipe and is located a plurality of cleaning head on the drain pipe, cleaning head swing joint drain pipe, just the movable plate has been cup jointed on the cleaning head, circulation mobile device is installed at the movable plate both ends, circulation mobile device includes power spare and the swiveling wheel of being connected with power spare, be equipped with the protruding structure of symmetry on the swiveling wheel, and the protruding structure position that is located the movable plate both ends distributes in the staggering way, utilizes swing joint's cleaning head, guarantees that the cleaning head can realize removing in the cleaning process, can wash the grit of side position, reduces the water consumption when improving the cleaning efficiency. The displacement device comprises a moving block, an eccentric part, a first connecting rod and a second connecting rod which are movably connected with each other, the first connecting rod is movably connected with the moving block, the second connecting rod is abutted against the eccentric part, the eccentric part is connected with a motor, a limiting seat is sleeved on the moving block, an elastic part is installed between the moving block and the limiting seat, the moving block is connected with a cleaning device through a synchronizing rod, the first connecting rod and the second connecting rod are driven to move by the rotation of the eccentric part, and therefore the moving block drives the cleaning device connected with the moving block to move in the moving process along with the first connecting rod, the cleaning device realizes the cyclic movement in the front, back, left and right directions, and the sand cleaning efficiency is improved. The utility model has the advantages that: through adjusting the position to the cleaning head, make it realize the circulation and remove, be convenient for utilize the cleaning head to wash the grit to reduce the earth on grit surface, improve grit separation efficiency and separation quality.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of a cleaning device according to the present invention;
fig. 3 is a schematic view of a connection structure of the middle circulation moving device and the moving plate of the present invention;
FIG. 4 is a schematic view of the connection structure between the rotating wheel and the power member;
fig. 5 is a schematic structural view of the displacement device of the present invention;
fig. 6 is a schematic view of another state structure of the displacement device of the present invention;
FIG. 7 is a schematic view of the connection structure of the displacement device and the cleaning device according to the present invention;
in the figure, 1-a material guiding device, 21-a supporting frame, 22-a screen, 23-a fixed seat, 3-a cleaning device, 31-a drain pipe, 32-a cleaning head, 33-a shell, 4-a water inlet pipe, 5-an elastic component, 6-a circulating moving device, 61-a driving component, 62-a rotating wheel, 621-a protruding structure, 63-a fixed shaft, 7-a moving plate, 81-a supporting column, 82-a pulley, 91-a moving block, 92-an eccentric component, 931-a first connecting rod, 932-a second connecting rod, 933-a third connecting rod, 934-a roller, 94-a limiting seat, 95-a fixed block, 961-a left limiting component, 962-a right limiting component, 97-an elastic component and 98-a synchronous rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, it is to be understood that the specific embodiments described herein are only used for explaining the present invention, and are not used for limiting the present invention.
Referring to fig. 1, the utility model provides a cleaning device for a sand-stone separator, which comprises a material guiding device 1, a screening device, a cleaning device 3 and a displacement device, wherein the material guiding device 1 is positioned above the screening device 3, the material guiding device 1 is connected with a water inlet pipe 4, the water outlet end of the water inlet pipe 4 is respectively connected with the material guiding device 1 and the cleaning device 4, sand-stone on the screening device is washed by the water inlet pipe 4, soil on the surface of the sand-stone is washed away, and the subsequent separation quality of the sand-stone is ensured; belt cleaning device 3 includes a plurality of drain pipe 31 and is located a plurality of cleaning head 32 on the drain pipe 31, cleaning head 32 swing joint drain pipe 31, just movable plate 7 has been cup jointed on the cleaning head 32, circulation mobile device 6 is installed at 7 both ends of movable plate, circulation mobile device 6 includes power piece 61 and the swiveling wheel 62 of being connected with power piece 61, be equipped with the protruding structure 621 of symmetry on the swiveling wheel 62, and be located the protruding structure 621 crisscross distribution in position at 7 both ends of movable plate, utilize swing joint's cleaning head 32, guarantee that cleaning head 32 can realize removing in the cleaning process, can wash the grit of side position, reduce the water consumption when improving the cleaning efficiency. The displacement device comprises a moving block 91, an eccentric part 92, a first connecting rod 931 and a second connecting rod 932 which are movably connected with each other, the first connecting rod 931 is movably connected with the moving block 91, the second connecting rod 932 abuts against the eccentric part 92, the eccentric part 92 is connected with a motor, a limiting seat 94 is sleeved on the moving block 91, an elastic part 97 is installed between the moving block 91 and the limiting seat 94, the moving block 91 is connected with the cleaning device 3 through a synchronizing rod 98, the first connecting rod 931 and the second connecting rod 932 are driven to move by rotation of the eccentric part 92, and therefore the moving block 91 drives the cleaning device 3 connected with the moving block to move in the moving process along with the first connecting rod 931, the cleaning device 3 is enabled to realize circular movement in four directions, front and back and left and right, and the sand cleaning efficiency is improved.
Preferably, the utility model discloses a belt cleaning device 3 still includes casing 33, be equipped with support column 81 on casing 33, just support column 81 is located movable plate 7 below, utilizes support column 81 to support movable plate 7, makes movable plate 7 can have the fulcrum at the removal in-process, prevents that it from appearing the phenomenon of dropping at the removal in-process, influences the regulating action to cleaning head 32.
Additionally, the utility model discloses a be equipped with pulley 82 on the support column 81, pulley 82 passes through rotation axis connection support column 81, just pulley 82 butt movable plate 7 utilizes pulley 82 to make the friction between support column 81 and the movable plate 7 become rolling friction by sliding friction, reduces frictional force, improves the removal efficiency, prolongs the life of support column 81 and movable plate 7 simultaneously.
Further, the utility model discloses a swiveling wheel 62 installs five, and it connects power part 61 through fixed axle 63, utilizes fixed axle 63 to make five swiveling wheel 62 form synchronous revolution, is convenient for effectively adjust the position of movable plate 7, realizes the regulation to cleaning head 32 angle, improves work efficiency, and the adoption of being connected between fixed axle 63 and the swiveling wheel 62 sets up a through-hole in the middle of swiveling wheel 62, inserts fixed axle 63 in this through-hole, then welds fixed axle 63 and swiveling wheel 62.
Better, the utility model discloses a protruding structure 621 of adjacent swiveling wheel 62 distributes in the staggered way, makes the protruding structure 621 of adjacent swiveling wheel distribute in the staggered way, is convenient for make adjacent movable plate 7 the moving time stagger to form the crisscross removal of cleaning head 32 and rinse, improve cleaning efficiency and cleaning quality.
The utility model discloses in the implementation: through pouring into grit waste residue through guide device 1, then filter the grit through the sieving mechanism, in the screening process, belt cleaning device 3 washs the grit in the screening process, reduces the debris of adhesion on the grit, the follow-up effective screening to the grit of being convenient for. Guide device 1 is the toper setting, just 4 one ends of inlet tube are located 1 top avris of guide device, utilize conical guide device 1 to lead the grit, then erode the grit in guide device 1 through inlet tube 4, make it realize removing, carry out preliminary washing to the grit moving the in-process. The sieving mechanism includes support frame 21 and the screen cloth 22 that is located the support frame 21 top, fixing base 23 is connected through elastic component 5 at support frame 21 both ends, utilizes elastic component 5 to make the grit contact with screen cloth 22 at the in-process that flows, utilizes grit self gravity and elastic component 5's elasticity, makes support frame 21 realize the shake, is convenient for utilize screen cloth 22 to filter the grit, guarantees the effective separation of grit.
As shown in fig. 2-4, be equipped with two protruding structures 621 on single swiveling wheel 62, just protruding structure 621 is the arc setting, utilizes the protruding structure 621 that the arc set up in grit shake separation process, can reduce the contact point between moving plate 7 and the protruding structure 621 to the protruding structure 621 who utilizes the arc structure is when carrying out the top to the moving plate 7, realizes the buffer power between protruding structure 621 and the moving plate 7, thereby prolongs its life. The power part 61 drives the fixed shaft 63 to rotate, the power part 61 adopts a motor, the output end of the motor is connected with the fixed shaft 63, and the fixed shaft 63 and the rotating wheel 62 fixedly connected with the fixed shaft 63 are driven to synchronously rotate. During the rotation, the moving plate 7 is pushed by the rotation wheel 62 and the protruding structure 621 on the rotation wheel 62, so that the moving plate 7 is moved. The number of the moving plates 7 corresponds to the number of the drain pipes 31, and support columns 81 and pulleys 82 are installed below the moving plates 7. In order to realize the left-right circular movement of the moving plate 7, the convex structures 621 on the rotating wheels 62 on both sides of the moving plate 7 are arranged in a staggered manner, when the convex structure 621 on the left side contacts with the moving plate 7, the convex structure 621 on the right side is separated from the contact of the moving plate 7, at this time, the moving plate 7 moves to the right, and otherwise, the moving plate moves to the left. In the moving process of the moving plate 7, the moving plate 7 is sleeved with the cleaning head 32, so that the cleaning head 32 is driven to move left and right, and sand on the left side and the right side of the screen 22 can be cleaned. In order to improve the cleaning efficiency, the moving directions of the adjacent moving plates 7 are opposite, that is, when the moving plate 7 in front moves to the left, the moving plate 7 in the back moves to the right, and the cleaning heads 32 are driven by the moving plates 7 moving in a staggered manner to realize the staggered movement, so that the sand and the stone are effectively cleaned, and the cleaning efficiency is improved. The cleaning head 32 is movably connected with the drain pipe 31 by a plastic rubber pipe or a folding guide pipe, so that the cleaning head 32 can be ensured to incline along with the movement of the moving plate 7.
As shown in fig. 5 to 7, the eccentric member 92 is driven by the motor to rotate, so as to push the second connecting rod 932 to move back and forth, in the moving process, the upper end of the second connecting rod 932 is movably connected with the first connecting rod 931, the lower end of the second connecting rod 932 is connected with the fixing block 95 through the third connecting rod 933, so as to drive the first connecting rod 931 and the moving block 91 connected with the first connecting rod 931 to move, in the moving process, the moving block 91 is connected with the casing 33 of the cleaning device 3 through the synchronizing rod 98, so as to drive the cleaning device 3 to move back and forth, and the position of the cleaning head 32 is conveniently and effectively adjusted. Displacement device still includes the shell, the movable block 91 below is equipped with the shifting chute, just spacing seat 94 is equipped with the guide post that matches with the shifting chute, the guide post is cup jointed to elastic component 97, just elastic component 97 is the spring, spacing seat 94 fixed connection shell utilizes elastic component 97 to provide the elasticity that resets to the removal of movable block 91, guarantees that movable block 91 realizes reciprocating motion under the effect of head rod 931 and elastic component 97, and then effectively adjusts belt cleaning device 3 of being connected with it. The second connecting rod 932 is connected with a fixing block 95 through a third connecting rod 933, the fixing block 95 is fixedly connected with the shell, a left limiting piece 961 and a right limiting piece 962 are arranged on two sides of the joint of the second connecting rod 932 and the third connecting rod 933, a fulcrum is provided for the movement of the second connecting rod 932 and the first connecting rod 931 through the fixing block 95, the second connecting rod 932 is enabled to effectively move, meanwhile, the position of the second connecting rod 932 is limited through the left limiting piece 961 and the right limiting piece 962, and the phenomenon that the second connecting rod 932 is moved too much is prevented from occurring, and the working quality is influenced. In order to guarantee the working quality, the size and the material of each part of the displacement device all need to be set according to actual conditions, and the phenomenon that the displacement device is immovable in adjustment due to the overlarge weight of the cleaning device 3 is prevented. In order to ensure that the cleaning device 3 can effectively move, a sliding connection mode of a groove and a convex groove is adopted between the shell 33 of the cleaning device 3 and the support frame 21, namely, the shell 33 of the cleaning device 3 is provided with the groove, the position of the support frame 21 corresponding to the groove is provided with the convex groove, the length of the convex groove is smaller than that of the groove, and the cleaning device 3 can effectively move under the driving of the displacement device. In the moving process, the water inlet pipe 4 and the cleaning device 3 need to be connected through a hose, so that the cleaning device 3 is prevented from driving the water inlet pipe 4 to move in the moving process to influence normal water inlet. The displacement device housing is fixed on the support frame 21, and each part composing the displacement device is positioned in the housing, so that the displacement device can provide a fulcrum and moving power for the movement of the cleaning device 3.
To sum up, the utility model provides a cleaning device for a sand-stone separator, which comprises a guide device, a screening device, a cleaning device and a displacement device, wherein the guide device is positioned above the screening device and is connected with a water inlet pipe, the water outlet end of the water inlet pipe is respectively connected with the guide device and the cleaning device, sand-stone on the screening device is washed by the water inlet pipe, soil on the surface of the sand-stone is washed away, and the subsequent separation quality of the sand-stone is ensured; the belt cleaning device includes a plurality of drain pipe and is located a plurality of cleaning head on the drain pipe, cleaning head swing joint drain pipe, just the movable plate has been cup jointed on the cleaning head, circulation mobile device is installed at the movable plate both ends, circulation mobile device includes power spare and the swiveling wheel of being connected with power spare, be equipped with the protruding structure of symmetry on the swiveling wheel, and the protruding structure position that is located the movable plate both ends distributes in the staggering way, utilizes swing joint's cleaning head, guarantees that the cleaning head can realize removing in the cleaning process, can wash the grit of side position, reduces the water consumption when improving the cleaning efficiency. The displacement device comprises a moving block, an eccentric part, a first connecting rod and a second connecting rod which are movably connected with each other, the first connecting rod is movably connected with the moving block, the second connecting rod is abutted against the eccentric part, the eccentric part is connected with a motor, a limiting seat is sleeved on the moving block, an elastic part is installed between the moving block and the limiting seat, the moving block is connected with a cleaning device through a synchronizing rod, the first connecting rod and the second connecting rod are driven to move by the rotation of the eccentric part, and therefore the moving block drives the cleaning device connected with the moving block to move in the moving process along with the first connecting rod, the cleaning device realizes the cyclic movement in the front, back, left and right directions, and the sand cleaning efficiency is improved. The utility model has the advantages that: through adjusting the position to the cleaning head, make it realize the circulation and remove, be convenient for utilize the cleaning head to wash the grit to reduce the earth on grit surface, improve grit separation efficiency and separation quality.
Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.
Claims (10)
1. A cleaning device for a sand-stone separator is characterized by comprising a material guide device, a screening device, a cleaning device and a displacement device, wherein the material guide device is positioned above the screening device and is connected with a water inlet pipe, and the water outlet end of the water inlet pipe is respectively connected with the material guide device and the cleaning device;
the cleaning device comprises a plurality of drain pipes and a plurality of cleaning heads positioned on the drain pipes, the cleaning heads are movably connected with the drain pipes, a movable plate is sleeved on the cleaning heads, circulating moving devices are installed at two ends of the movable plate and comprise power parts and rotating wheels connected with the power parts, symmetrical protruding structures are arranged on the rotating wheels, and the protruding structures positioned at two ends of the movable plate are distributed in a staggered mode;
the displacement device comprises a moving block, an eccentric part, a first connecting rod and a second connecting rod which are movably connected with each other, the first connecting rod is movably connected with the moving block, the second connecting rod is abutted against the eccentric part, the eccentric part is connected with a motor, a limiting seat is sleeved on the moving block, an elastic part is installed between the moving block and the limiting seat, and the moving block is connected with a cleaning device through a synchronizing rod.
2. The cleaning device for a sand separator according to claim 1, further comprising a housing, wherein a support column is provided on the housing, and the support column is located below the moving plate.
3. The cleaning device for a sand and stone separator according to claim 2, wherein a pulley is provided on the support column, the pulley is connected to the support column through a rotating shaft, and the pulley abuts against the moving plate.
4. The cleaning apparatus for a sand separator according to claim 1, wherein five rotary wheels are mounted and connected to the power member by a fixed shaft.
5. A cleaning apparatus for a sand separator according to claim 4, wherein the raised formations of adjacent wheels are staggered.
6. The cleaning device for a sand separator according to claim 5, wherein two convex structures are provided on said single rotating wheel, and said convex structures are arranged in an arc shape.
7. The cleaning device for the sand-gravel separator as claimed in claim 1, wherein the material guiding device is arranged in a conical shape, and one end of the water inlet pipe is positioned at the upper side of the material guiding device.
8. The cleaning device for the sand-stone separator as claimed in claim 1, wherein the screening device comprises a support frame and a screen mesh positioned above the support frame, and two ends of the support frame are connected with the fixed seat through elastic members.
9. The sand and stone separator cleaning device as claimed in claim 1, wherein the displacement device further comprises a housing, a moving groove is arranged below the moving block, the limiting seat is provided with a guide post matched with the moving groove, the elastic member is sleeved with the guide post and is a spring, and the limiting seat is fixedly connected with the housing.
10. The cleaning device for a sand and stone separator according to claim 9, wherein the second connecting rod is connected to a fixed block through a third connecting rod, the fixed block is fixedly connected to the housing, and a left stopper and a right stopper are provided on both sides of a joint of the second connecting rod and the third connecting rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920413070.8U CN209953354U (en) | 2019-03-28 | 2019-03-28 | Cleaning device for sand-stone separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920413070.8U CN209953354U (en) | 2019-03-28 | 2019-03-28 | Cleaning device for sand-stone separator |
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| Publication Number | Publication Date |
|---|---|
| CN209953354U true CN209953354U (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920413070.8U Expired - Fee Related CN209953354U (en) | 2019-03-28 | 2019-03-28 | Cleaning device for sand-stone separator |
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| Country | Link |
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| CN (1) | CN209953354U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921853A (en) * | 2020-08-05 | 2020-11-13 | 陈小英 | Straw is retrieved and is used screening plant |
-
2019
- 2019-03-28 CN CN201920413070.8U patent/CN209953354U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921853A (en) * | 2020-08-05 | 2020-11-13 | 陈小英 | Straw is retrieved and is used screening plant |
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Granted publication date: 20200117 Termination date: 20210328 |