CN215508079U - Highway aggregate screening and washing device - Google Patents
Highway aggregate screening and washing device Download PDFInfo
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- CN215508079U CN215508079U CN202120885724.4U CN202120885724U CN215508079U CN 215508079 U CN215508079 U CN 215508079U CN 202120885724 U CN202120885724 U CN 202120885724U CN 215508079 U CN215508079 U CN 215508079U
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- 238000005406 washing Methods 0.000 title claims abstract description 60
- 238000012216 screening Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 238000004140 cleaning Methods 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims description 5
- 241000883990 Flabellum Species 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract description 5
- 238000004506 ultrasonic cleaning Methods 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011012 sanitization Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses a highway aggregate screening and washing device which comprises a control box, a box cover, a washing water tank body and a washing equipment case. Wherein, a water filling port is arranged on the control box, and a drawable metal faucet is arranged at the bottom of the box cover; a screen assembly is arranged in the cleaning water tank body, and screen layers of the screen assembly are connected in a sealing manner; a motor and an ultrasonic generator are arranged in the cleaning equipment cabinet, one end of a bearing of the motor is arranged at the bottom of the cleaning water tank body in a penetrating manner, the other end of the bearing is provided with a plurality of fan blades, and the ultrasonic generator is arranged below the cleaning water tank body; an outlet observation pipe is arranged in the cleaning equipment case. By the device, automation of the aggregate washing test can be realized, manpower is greatly saved, and working efficiency is improved; the adoption is soaked, ultrasonic cleaning avoids a large amount of bath from to reach the water economy purpose, has avoided the loss that the sample was washed to the high pressure simultaneously, has improved the precision of sampling.
Description
Technical Field
The embodiment of the utility model belongs to the technical field of aggregate raw material washing and screening in highway engineering test detection, and particularly relates to a highway aggregate screening and washing device.
Background
Along with the national strong enhancement of infrastructure construction, the highway engineering construction strength is increased, and the detection of the aggregate mud content and the mud block content is of great importance. The aggregate washing and screening test includes setting dry aggregate in certain weight inside a clean container, adding water, stirring and washing, pouring the suspension mixed with fine powder into a set sieve, washing aggregate repeatedly until the water is clean, collecting the set sieve and the aggregate inside the container in an enamel tray, stoving in an oven and sieving the aggregate successively.
The existing related methods mostly adopt a manual washing method to wash the aggregate, are complex in operation, need professional and experienced personnel to operate, are low in efficiency, and have obvious influence on data precision by manual operation. Therefore, it is very important to develop a device capable of automatically screening and cleaning the aggregate.
Patent No. CN 212932133U's utility model provides a highway engineering test detects raw and other materials washing screening test device that gathers materials, the inside big shower nozzle that is equipped with in frame top portion, the relative both sides of frame are equipped with high-pressure buffering shower nozzle, big shower nozzle below is equipped with orifice plate one, orifice plate one below is equipped with orifice plate two, orifice plate two below is equipped with foraminiferous recess, the positive bottom of frame is equipped with the electricity machine of changeing, electricity machine upper end is connected with the connecting rod of wearing to establish foraminiferous recess, both ends fixedly connected with brush holder about the connecting rod, the brush holder below is connected with the brush, the brush below is equipped with the puddler of being connected with the connecting rod. However, the device is complex in structure, a plurality of high-buffer pressure spray heads need to be laid, water consumption is high, and the sample is easy to scour and adhere to the top end and the side wall, so that sampling is inaccurate, and test results are wrong.
Disclosure of Invention
Aiming at the defects of complex structure, high water consumption, inaccurate sampling and the like of the screening and washing device in the prior art, the utility model provides the screening and washing device which is simple in structure, convenient to operate, low in water consumption and accurate in sampling.
In order to achieve the purpose, the utility model provides a screening and washing device for highway aggregate, which comprises a control box, a box cover, a washing water tank body and a washing equipment case, wherein the control box, the box cover, the washing water tank body and the washing equipment case are sequentially arranged; the control box is provided with a water filling port, and the water filling port is connected with a drawable metal faucet arranged at the bottom of the box cover through a pipeline; a screen assembly is arranged in the cleaning water tank body, and screen layers of the screen assembly are connected in a sealing manner; the cleaning equipment machine is characterized in that a motor and an ultrasonic generator are arranged in the cleaning equipment machine case, one end of a bearing of the motor is penetrated and arranged at the bottom of the cleaning water tank body, a plurality of fan blades are arranged at the other end of the bearing, the ultrasonic generator is arranged at the bottom of the cleaning water tank body, the motor and the ultrasonic generator are communicated with a control box, a water outlet observation tube is arranged in the cleaning equipment machine case, one end of the water outlet observation tube is penetrated and arranged at the bottom of the cleaning water tank body, and the other end of the water outlet observation tube passes through the side wall opening of the cleaning equipment machine case and is arranged outside the case.
Further, according to the highway aggregate screening washing unit of claim, characterized in that, screen assembly includes sample layer, first can dismantle experimental screen layer and the experimental screen layer of second can dismantle, screen assembly's screen layer sets up from top to bottom according to the screen surface aperture in proper order from big to little, first can dismantle experimental screen layer sets up at screen assembly bottommost layer.
Furthermore, the detachable test sieve layer with different aperture sieve surfaces can be replaced below the sample layer according to the experimental needs, or a plurality of detachable test sieve layers are additionally arranged.
Further, the highway aggregate screening washing device as claimed in the claim, wherein the bottom of the sample layer is composed of a net woven by metal wires; the first detachable test screen layer comprises a screen outer frame, a screen surface arranged at the bottom of the first detachable test screen layer, a screen ring clamping hook arranged on the screen outer frame and a screen ring layer connected with the screen ring clamping hook. The first detachable test sieve layer screen mesh outer frame is externally and fixedly provided with an annular protruding part, and the annular protruding part is matched with the protruding part in the cleaning water tank body.
Furthermore, the test sieve mesh layer can be dismantled with the second to the sample layer, can dismantle through buckle mode sealing connection between test sieve mesh layer and the first test sieve mesh layer of dismantling to the second.
Further, the test sieve mesh layer can be dismantled with the second to the sample layer, can dismantle test sieve mesh layer and first can dismantle between the test sieve mesh layer through screw thread mode sealing connection.
Furthermore, an automatic water filling valve is arranged on the metal faucet; the water outlet observation tube penetrates through the bottom of the cleaning water tank body and is connected with an automatic water outlet valve arranged at the bottom in the cleaning water tank body; the automatic water filling valve and the automatic water outlet valve are in communication connection with the control box.
Furthermore, the water outlet observation tube is made of transparent materials.
Furthermore, a function button panel is arranged on the control box, a control circuit board is arranged inside the control box, and a function control module is arranged on the control circuit board.
Furthermore, a handrail is arranged on the outer side of the tank cover, and a connecting shaft of the tank body and the tank cover is arranged between the tank cover and the cleaning water tank body.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the washing device for screening the highway aggregate adopts an integrated design, and is sequentially provided with a water inlet, a control box, a box cover, a washing water tank body and a washing equipment case from top to bottom, wherein a screen assembly is arranged in the washing water tank body. The control box program sends out an instruction, the water outlet is controlled to inject water into the cleaning water tank body, and the cleaning equipment case carries out water cleaning and screening work on the sample in the screen assembly, so that the integration of cleaning and screening processes in an aggregate water cleaning and screening test is realized, and the structure is simple and the operation is convenient.
(2) The utility model discloses a washing device for screening highway aggregate, which adopts a mode of soaking a sample, can drive water in a washing water tank body to start rotating motion through a blade which is arranged at the bottom in the washing water tank body and is connected with a motor, and can screen and wash the sample under the drive of water flow; the ultrasonic generator arranged below the cleaning water tank body sends out ultrasonic waves into the cleaning water tank body, so that water in the water tank sends out strong vibration flow, the vibration flow forms water vibration, and dust and stains on a sample are cleaned more cleanly. By adopting the cleaning modes of soaking, blade-driven water flow rotation, ultrasonic cleaning and the like, the device avoids repeatedly washing the sample, and is more water-saving and environment-friendly.
(3) The utility model relates to a washing device for screening highway aggregate, wherein a screen assembly consists of a sample layer, a detachable test screen layer and a detachable test screen layer, which are hermetically connected with one another, so that the sample is prevented from being washed out and lost, the sample layer, the detachable test screen layer and the detachable test screen layer can be detached respectively after the screening and cleaning work is finished, and the sample adhered to the inner wall of the screen layer is washed to the screen surface by a drawable metal tap, so that the collection work of the sample is finished. Through this device, the effectual sample loss of having avoided ensures experimental data's accuracy.
(4) According to the washing device for screening the highway aggregate, the screen assembly is detachably arranged, the detachable test screen layer and the detachable test screen layer can be combined and replaced according to different aggregate requirements, a plurality of test screen layers can be added, and the washing device is wide in application range.
Drawings
FIG. 1 is a schematic diagram of the internal cross-sectional structure of a water washing device for screening road aggregate according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a plane structure of a detachable test screen layer of a washing device for screening highway aggregate according to an embodiment of the utility model;
fig. 3 is a plan view of a control box of a water washing device for screening highway aggregate according to an embodiment of the utility model.
In all the figures, the same reference numerals denote the same features, in particular: 1-water filling port, 2-control box, 3-handrail, 4-drawable metal tap, 5-box and box cover connecting shaft, 6-screen component, 61-first detachable test screen layer, 611-screen surface, 612-screen hanging ring hook, 613-screen hanging ring, 614-screen outer frame, 615-annular bulge, 62-second detachable test screen layer, 7-blade, 8-motor, 9-ultrasonic generator, 10-cleaning equipment cabinet, 11-cleaning water tank body, 12-box cover, 13-water outlet observation tube, 14-sample layer, 15-water filling port automatic valve and 16-water outlet automatic valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in FIG. 1, the embodiment of the utility model provides a washing device for screening road aggregate, which comprises a control box 2, a box cover 12, a washing water tank body 11 and a washing equipment case 10 which are sequentially arranged. The water filling port 1 arranged on the control box 2 is connected with the drawable metal water tap 4 arranged below the box cover 12 through a pipeline; the cleaning equipment case 10 is internally provided with a cleaning device which can drive water in the cleaning water tank body 11 to flow and screen and ultrasonically clean samples of the screen component 6, and the cleaning equipment case 10 is internally provided with a cleaning device which can drive the water in the cleaning water tank body 11 to flow; after the cleaning work is finished, the sewage is automatically discharged from the water outlet observation pipe 13; the box cover 12 is opened, the sample adhered to the inner wall of the screen assembly 6 is flushed to the screen surface by the drawable metal tap 4, and then collected in a tray in sequence for subsequent testing. By the device, automation of the aggregate washing test can be realized, manpower is greatly saved, and working efficiency is improved; the adoption is soaked, ultrasonic cleaning avoids a large amount of bath from to reach the water economy purpose, has avoided the loss that the sample was washed to the high pressure simultaneously, has improved the precision of sampling.
As shown in fig. 1, in the embodiment of the present invention, a handrail 3 is disposed on an outer side of a tank cover 12, a tank cover and tank cover connecting shaft 5 is disposed between the tank cover 12 and a cleaning tank 11, and the tank cover 12 can be opened upward along the tank cover and tank cover connecting shaft 5 by the handrail 3; the bottom of the box cover 12 is provided with a drawable metal tap 4 connected with the water outlet 1 in a penetrating way, the metal tap 4 is provided with a water filling port automatic valve 15, and the water filling port automatic valve 15 is in communication connection with the control box 2 and can automatically control the on-off of water outlet.
As shown in fig. 1, in an embodiment of the present invention, the screen assembly 6 comprises a specimen layer 14, a first removable test screen layer 61, a second removable test screen layer 62; wherein, the bottom of the sample layer 14 is composed of a net woven by metal wires. The experimental screen layer of dismantling of different aperture siftings can be changed according to the experiment needs in sample layer 14 below, or add a plurality of experimental screen layers of dismantling, and further, can dismantle experimental screen layer and set up from the top down according to sifting surface aperture from big to little in proper order. A removable test screen layer 61 is provided at the lowermost layer of the screen assembly 6.
The sample layer 14 and the detachable test sieve layer 61 and 62 have the same diameter and are similar in structure, the layers are connected in a sealing mode, preferably, the lower edges of the outer frames of the sample layer 14 and the detachable test sieve layer can be arranged to be small-angle outward along the vertical direction of the outer frame along the opening direction, the upper edge direction of the outer frame of the detachable test sieve layer is arranged to be small-angle inward along the vertical direction of the outer frame along the opening direction, the upper edge and the lower edge of the outer frame form buckles, the upper edge and the lower edge of the outer frame are both made of elastic materials, when the test sieve layer is used, the lower edge of the upper sieve layer is buckled into the upper edge of the lower sieve layer to form a sealing part, and water seepage can be prevented; preferably, the upper edge and the lower edge of the screen layer can be provided with matched internal threads and external threads, and the upper screen layer is connected with the lower screen layer through screwing.
As shown in fig. 2, in the embodiment of the present invention, the detachable test screen layer 61 includes a screen surface 611, a screen ring hook 612, a screen ring 613, a screen frame 614, and an annular protrusion 615. Wherein, the screen surface 611 is arranged at the bottom of the detachable test screen layer 61; the screen lifting ring clamping hook 612 is arranged on the screen outer frame 614 along the two ends of the diameter of the detachable test screen layer 61, the screen lifting ring 613 is connected with the screen lifting ring clamping hook 612, and the detachable test screen layer 61 can be conveniently lifted out of or placed into the cleaning water tank body 11 through the screen lifting ring 613; the screen frame 614 is externally fixed with a ring-shaped protrusion 615, and the screen assembly 6 is limited on the protrusion arranged inside the water tank body 11 by matching with the protrusion arranged inside the water tank body 11.
As shown in fig. 1, in the embodiment of the present invention, a motor 8, an ultrasonic generator 9, and an effluent observation tube 13 are disposed in a cabinet 10 of the cleaning apparatus, and the motor 8 and the ultrasonic generator 9 are in communication connection with a control box 2. Wherein motor 8's bearing one end runs through the setting and is wasing water tank box 11 bottom, and the portion of running through adopts waterproof design, and the bearing sets up along wasing 11 vertical the central axes of water tank box, is equipped with a plurality of flabellums in the one end of not being connected with motor 8, and motor 8 during operation, bearing drive flabellum work for wash the water rotary motion of beginning in the water tank box 11, under the drive of rivers, can sieve, cleaning work to the sample. A plurality of ultrasonic generators 9 are arranged below a cleaning water tank 11, the ultrasonic generators 9 send ultrasonic waves into the cleaning water tank 11, so that water in the water tank sends strong vibration flow, the vibration flow forms water vibration, and dust and stains on a sample are cleaned. The side wall of the cleaning equipment cabinet 11 is provided with an opening, the water outlet observation pipe 13 penetrates through the bottom of the cleaning water tank body 11 through the opening and is connected with a water outlet automatic valve 16 arranged at the bottom in the water tank body 11, and the water outlet observation pipe 13 is made of transparent materials and used for discharging and observing sewage.
As shown in fig. 3, in the embodiment of the present invention, the control box 2 is provided with a function button panel, a control circuit board is arranged inside the control box, and a function control module is arranged on the control circuit board, so that the control box can have functions of controlling the water adding time, the standing time, the blade rotation cleaning time, the fixed period program of the ultrasonic generator operation, setting the program operation times, automatically turning on the drainage switch, and the like.
In another embodiment of the utility model, a method for washing device for screening road aggregate is provided, a power switch on a control box 2 is turned on, coarse aggregate or fine aggregate is selected according to aggregate sample specification, washing times are selected, a start button is clicked, the control box 2 opens an automatic water injection port valve 15 to inject water to a washing water tank body 11 through a drawable metal faucet 4, the water injection amount is recorded, the washing water stops automatically after a sample in a sample layer is soaked in water, a motor 8 in a washing equipment case 10 starts to work after the sample is soaked for a certain time, a blade 7 is driven to start to rotate at a certain speed determined by the type of the aggregate, the sample starts to be washed through the flow of water, the rotation is carried out for 3 minutes, the motor 8 stops working, an ultrasonic generator 9 starts to work, dust adhered to the surface of the aggregate is washed through ultrasonic waves, the sample is cleaner, and after the sample is washed for 1 minute, ultrasonic generrator 9 stop work, 7 minutes after the secondary rotation blade stop rotation, make the sample sink and fall on sifting surface 611, 2 minutes after stewing, open delivery port automatic valve 16 and observe the inside water of pipe 11 discharge through going out water, treat that the water discharge finishes the back, delivery port automatic valve 16 closes, so for washing once, until reaching the experimental number of times that sets up, whether the experimental back accessible 13 play water observation pipe (transparent) discharged water observation sample sanitization, if not the sanitization, can set up the number of times of washing once more and continue to wash. After cleaning, a water injection switch on the control box 2 is pressed, the drawable metal faucet 4 is pulled open, so that samples adhered to the inner frame of the sample layer inner part 14 and the detachable sieve layer 61 and the inner frame of the sample layer inner part 62 are flushed onto the sieve surface, and then the samples are sequentially collected to a tray for subsequent tests.
The standing time, the blade rotating and cleaning time, the fixed period program of the ultrasonic generator work and the working times of the setting program can be set by an operator according to actual needs.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A screening and washing device for highway aggregate is characterized by comprising a control box (2), a box cover (12), a washing water tank body (11) and a washing equipment case (10) which are sequentially arranged; wherein,
a water filling port (1) is arranged on the control box (2), and the water filling port (1) is connected with a drawable metal faucet (4) arranged at the bottom of the box cover (12) through a pipeline;
a screen assembly (6) is arranged in the cleaning water tank body (11), and screen layers of the screen assembly (6) are connected in a sealing manner;
be equipped with motor (8), supersonic generator (9) in cleaning equipment machine case (10), the bearing one end of motor (8) is run through and is located and wash water tank box (11) bottom, and the other end is equipped with a plurality of flabellums, supersonic generator (9) are located and are washed water tank box (11) bottom, motor (8), supersonic generator (9) link to each other with control box (2) communication, be equipped with out water observation tube (13) in cleaning equipment machine case (10), go out water observation tube (13) one end and run through and locate wash water tank box (11) bottom, the other end passes through cleaning equipment machine case (10) lateral wall opening sets up outside the case.
2. The highway aggregate screening washing device of claim 1, wherein the screen assembly (6) comprises a sample layer (14), a first detachable test screen layer (61) and a second detachable test screen layer (62), the screen layers of the screen assembly (6) are sequentially arranged from top to bottom according to the screen surface aperture from large to small, and the first detachable test screen layer (61) is arranged at the bottommost layer of the screen assembly (6).
3. The highway aggregate screening washing device of claim 2, wherein a plurality of detachable test screen layers with different screen surfaces can be replaced or additionally arranged below the sample layer (14) according to the experiment requirement.
4. The highway aggregate screening washing device as claimed in claim 2, wherein the bottom of the sample layer (14) is composed of a net woven by metal wires;
the first detachable test sieve layer (61) comprises a sieve screen outer frame (614), a sieve surface (611) arranged at the bottom of the first detachable test sieve layer (61), a sieve screen lifting ring clamping hook (612) arranged on the sieve screen outer frame (614) and a sieve screen lifting ring (613) connected with the sieve screen lifting ring clamping hook (612);
an annular protruding part (615) is fixedly arranged outside a screen outer frame (614) of the first detachable test screen layer (61), and the annular protruding part (615) is matched with a protruding part arranged inside the cleaning water tank body (11).
5. A road aggregate screening water washing device according to any one of claims 2-4, characterized in that the sample layer (14) and the second detachable test screen layer (62) are hermetically connected through a snap-fit manner, and the second detachable test screen layer (62) and the first detachable test screen layer (61) are hermetically connected through a snap-fit manner.
6. A road aggregate screening water washing device according to any one of claims 2-4, characterized in that the sample layer (14) is hermetically connected with the second detachable test screen layer (62), the second detachable test screen layer (62) and the first detachable test screen layer (61) in a threaded manner.
7. The highway aggregate screening washing device according to any one of claims 1-4, characterized in that an automatic water filling valve (15) is arranged on the metal water faucet (4);
the water outlet observation pipe (13) penetrates through the bottom of the cleaning water tank body (11) and is connected with an automatic water outlet valve (16) arranged at the bottom in the water tank body (11);
the automatic water filling valve (15) and the automatic water outlet valve (16) are in communication connection with the control box (2).
8. A road aggregate screening and washing device according to any one of claims 1 to 4, characterized in that the outlet observation pipe (13) is made of transparent material.
9. A screening and washing device for road aggregate according to any one of claims 1-4, characterized in that a function button panel is arranged on the control box (2), a control circuit board is arranged inside the control box, and a function control module is arranged on the control circuit board.
10. A road aggregate screening and washing device as claimed in any one of claims 1 to 4, characterized in that handrails (3) are arranged on the outer side of the tank cover (12), and a tank cover and tank cover connecting shaft (5) is arranged between the tank cover (12) and the washing water tank body (11).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202120885724.4U CN215508079U (en) | 2021-04-27 | 2021-04-27 | Highway aggregate screening and washing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN202120885724.4U CN215508079U (en) | 2021-04-27 | 2021-04-27 | Highway aggregate screening and washing device |
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Publication Number | Publication Date |
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CN215508079U true CN215508079U (en) | 2022-01-14 |
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CN202120885724.4U Active CN215508079U (en) | 2021-04-27 | 2021-04-27 | Highway aggregate screening and washing device |
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2021
- 2021-04-27 CN CN202120885724.4U patent/CN215508079U/en active Active
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