CN209810398U - Sand making machine - Google Patents
Sand making machine Download PDFInfo
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- CN209810398U CN209810398U CN201920597890.7U CN201920597890U CN209810398U CN 209810398 U CN209810398 U CN 209810398U CN 201920597890 U CN201920597890 U CN 201920597890U CN 209810398 U CN209810398 U CN 209810398U
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- filter cavity
- sand
- filtering
- cleaning
- scraper
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Abstract
The utility model relates to the technical field of sand making equipment, in particular to a sand making machine, which comprises a sand making machine body, wherein the sand making machine body comprises a feeding mechanism and a crushing mechanism; the feeding mechanism and the crushing mechanism are arranged on the front part and the rear part of the frame platform, and four wheels are correspondingly arranged on the front side and the rear side of the frame platform; the feeding mechanism is connected with the crushing mechanism through a first conveying belt assembly; one end of the feeding mechanism is hinged with an inclined plate ladder; it also includes a cleaning assembly; the cleaning assembly is arranged at the rear end of the crushing mechanism and consists of a graded screening pre-cleaning component and a multi-stage spiral conveying cleaning component; the sand washing mechanism is arranged behind the crushing mechanism of the sand making mechanism, so that sand grains are washed; the sand washing machine has the advantages of being convenient to use, fast in sand washing speed, capable of achieving the effect that two crushing and sand washing are combined into one, forming a flowing water effect and greatly improving the working efficiency.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a system husky equipment technical field, concretely relates to system husky machinery.
[ background of the invention ]
The sand making machine is a crushing device formed by combining the principle of a Bamark vertical shaft impact crusher on the basis of the experience of powder machine equipment, is widely used for fine crushing of various ores, replaces the traditional devices such as a hammer crusher, a double-roller crusher, a rod mill and the like, and becomes the mainstream equipment in the sand making industry. The working principle is that the material falls into the impeller rotating at high speed from the upper part of the machine, then collides with the material which is divided around the impeller in an umbrella shape with the other part under the action of high-speed centrifugal force, then mutually collides, rubs and crushes again or for many times in a strong vortex formed between the impeller and the casing, finally is discharged from a discharge port at the lower part of the sand making machine, and is controlled by a screening device to reach the required finished product granularity.
But traditional system husky machinery only has broken material effect, and the sand grain that forms after the material breakage is wrapped up by dust and the former surface attachment of material, and traditional system husky machinery does not have cleaning function, leads to the sand grain can't realize real-time cleaning, needs the later stage to carry out the secondary again and washs, and troublesome inconvenient, work efficiency is low, can not form the line production yet.
[ Utility model ] content
An object of the utility model is to provide a system husky machinery to prior art's defect and not enough.
The utility model relates to a sand making machine, which comprises a sand making machine body, wherein the sand making machine body comprises a feeding mechanism and a crushing mechanism; the feeding mechanism and the crushing mechanism are arranged on the front part and the rear part of the frame platform, and four wheels are correspondingly arranged on the front side and the rear side of the frame platform; the feeding mechanism is connected with the crushing mechanism through a first conveying belt assembly; one end of the feeding mechanism is hinged with an inclined plate ladder;
it also includes a cleaning assembly; the cleaning assembly is arranged at the rear end of the crushing mechanism and consists of a graded screening pre-cleaning component and a multi-stage spiral conveying cleaning component;
the classified screening pre-cleaning component comprises a screening box, and the top end and the bottom end of the screening box are in an open shape; the upper part, the middle part and the lower part in the screening box are respectively provided with a first filtering vibration screen, a second filtering vibration screen and a third filtering vibration screen which are used for separating a first filtering cavity, a second filtering cavity and a third filtering cavity; the inner walls of the two side surfaces of the first filter cavity, the second filter cavity and the third filter cavity are correspondingly provided with guide rails; a first scraper, a second scraper and a third scraper are respectively arranged on the guide rails of the first filter cavity, the second filter cavity and the third filter cavity; the top ends of the first scraper, the second scraper and the third scraper are horizontally arranged, and the bottom end shapes of the first scraper, the second scraper and the third scraper are matched with the shapes of the first filtering vibrating screen, the second filtering vibrating screen and the third filtering vibrating screen;
the middle parts of the back surfaces of the first filter cavity, the second filter cavity and the third filter cavity are respectively provided with a first shaft hole, a second shaft hole and a third shaft hole; the middle parts of the back surfaces of the first filter cavity, the second filter cavity and the third filter cavity are respectively provided with a first air cylinder, a second air cylinder and a third air cylinder; piston rods of the first air cylinder, the second air cylinder and the third air cylinder respectively penetrate through the first shaft hole, the second shaft hole and the third shaft hole and are connected with the middle parts of the back surfaces of the first scraper blade, the second scraper blade and the third scraper blade; a first sand outlet, a second sand outlet and a third sand outlet are respectively arranged on the left side of the front of the first filter cavity, the middle part of the front of the second filter cavity and the right side of the front of the third filter cavity;
a square spraying plate is arranged above the screening box, and the right side end of the square spraying plate is connected with the left side end of the crushing mechanism; the bottom surface of the square spraying plate is provided with a plurality of first nozzles; the middle of the top surface of the square spraying plate is provided with a first water inlet, a first water inlet pipe is arranged on the first water inlet, a first ball valve is arranged on the first water inlet pipe, and the first water inlet pipe is communicated with a water delivery main pipe; a ball valve II is arranged on the water delivery main pipe;
the multi-stage spiral conveying cleaning component is arranged at the rear end of the graded screening pre-cleaning component; the multistage spiral conveying and cleaning component comprises an inclined bottom frame, wherein the left end of the inclined bottom frame is higher than the right end of the inclined bottom frame to form an inclined structure with a high left end and a low right end; an inclined box body is arranged on the inclined underframe; two partition plates are arranged in the inclined box body along the longitudinal direction, and the inclined box body is divided into a first cleaning bin, a second cleaning bin and a third cleaning bin; a first screw conveyor, a second screw conveyor and a second screw conveyor are arranged in the first cleaning bin, the second cleaning bin and the third cleaning bin; the inner ends of the first spiral conveyor, the second spiral conveyor and the second spiral conveyor are respectively provided with a first gear, a second gear and a third gear; the first gear, the second gear and the third gear are meshed with each other; the second gear is connected with the output end of the motor; the first sand outlet, the second sand outlet and the third sand outlet in front of the screening box are arranged above the inlets at the inner side ends of the first cleaning bin, the second cleaning bin and the third cleaning bin; the inner wall of the top surface of the inclined box body is provided with a water pipe shaped like a Chinese character feng, and the bottom surface of the water pipe shaped like a Chinese character feng is provided with a plurality of second nozzles; a plurality of water guide holes are formed in the inclined box body; and a second water inlet is formed in the middle of the top surface of the inclined box body, the second water inlet is connected with a second water conveying pipe, and the second water conveying pipe is connected with a main water conveying pipe.
Furthermore, the feeding mechanism comprises a supporting frame, the supporting frame consists of four supporting rods, and the four supporting rods are fixedly arranged at four corners of the front end of the surface of the frame platform and are fixed through screws; square frame fence is installed on braced frame's top, and it has the fence board to articulate on the four borders of square frame fence, and the feeder hopper is installed to square frame fence bottom.
Furthermore, the left end of the first filtering vibration screen is lower than the right end of the first filtering vibration screen to form a slant vibration screen with a structure of low left and high right.
Furthermore, the left side end and the right side end of the second filtering vibration screen are inclined towards the middle to form the vibration screen with a bidirectional opposite inclined structure.
Furthermore, the left end of the third filtering vibration screen is higher than the right end of the third filtering vibration screen to form an oblique vibration screen with a structure of being high at the left and low at the right.
After the structure is adopted, the utility model discloses beneficial effect does: the utility model relates to a sand making machine, which adopts a sand washing mechanism arranged behind a crushing mechanism of a sand making mechanism to realize the cleaning of sand grains; the sand washing machine has the advantages of being convenient to use, fast in sand washing speed, capable of achieving the effect that two crushing and sand washing are combined into one, forming a flowing water effect and greatly improving the working efficiency.
[ description of the drawings ]
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a classifying screen precleaning member according to the present invention;
fig. 3 is a schematic structural view of the multi-stage screw conveying cleaning member of the present invention.
Description of reference numerals:
1. an inclined plate ladder; 2. a feeding mechanism; 3. the feeding mechanism passes through the first conveying belt assembly; 4. a frame platform; 5. a crushing mechanism; 6. screening the pre-cleaning component in a grading way; 7. a multi-stage screw conveying cleaning member; 8. a conveyor belt mechanism; 9. a square spray plate; 10. a water delivery main pipe.
[ detailed description ] embodiments
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and the description are only for the purpose of explanation, but not for the purpose of limitation.
As shown in fig. 1 to 3, the sand making machine according to the present embodiment includes a sand making machine body, which includes a feeding mechanism 2 and a crushing mechanism 5; the feeding mechanism and the crushing mechanism are arranged on the front part and the rear part of the frame platform 4, and four wheels are correspondingly arranged on the front side and the rear side of the frame platform 4; the feeding mechanism 2 is connected with the crushing mechanism 5 through a conveyor belt assembly I3; one end of the feeding mechanism 2 is hinged with an inclined plate ladder 1;
it also includes a cleaning assembly; the cleaning assembly is arranged at the rear end of the crushing mechanism and consists of a graded screening pre-cleaning component 6 and a multi-stage spiral conveying cleaning component 7;
as shown in fig. 2, the classifying screen pre-washing member 6 includes a screen box 601, and the top and bottom ends of the screen box 601 are open; a first filtering vibration screen 602, a second filtering vibration screen 604 and a third filtering vibration screen 605 are respectively arranged at the upper part, the middle part and the lower part in the screening box 601, and a first filtering cavity, a second filtering cavity and a third filtering cavity are separated; guide rails 612 are correspondingly arranged on the inner walls of the two side surfaces of the first filter cavity, the second filter cavity and the third filter cavity; a first scraper, a second scraper and a third scraper are respectively arranged on the guide rails 612 of the first filter cavity, the second filter cavity and the third filter cavity; the top ends of the first scraper, the second scraper and the third scraper are horizontally arranged, and the bottom end shapes of the first scraper, the second scraper and the third scraper are matched with the shapes of the first filtering vibrating screen 602, the second filtering vibrating screen 604 and the third filtering vibrating screen 605;
the middle parts of the back surfaces of the first filter cavity, the second filter cavity and the third filter cavity are respectively provided with a first shaft hole, a second shaft hole and a third shaft hole; the middle parts of the back surfaces of the first filter cavity, the second filter cavity and the third filter cavity are respectively provided with a first air cylinder 610, a second air cylinder 609 and a third air cylinder; piston rods of the first air cylinder 610, the second air cylinder 609 and the third air cylinder respectively penetrate through the first shaft hole, the second shaft hole and the third shaft hole and are connected with the middle parts of the back surfaces of the first scraper, the second scraper and the third scraper; a first sand outlet 603, a second sand outlet and a third sand outlet 606 are respectively arranged on the left side of the front of the first filter cavity, the middle part of the front of the second filter cavity and the right side of the front of the third filter cavity;
a square spray plate 9 is arranged above the screening box 601, and the right side end of the square spray plate 9 is connected with the left side end of the crushing mechanism 5; the bottom surface of the square spraying plate 9 is provided with a plurality of first nozzles; a first water inlet is formed in the middle of the top surface of the square spraying plate 9, a first water inlet pipe is mounted on the first water inlet, a first ball valve is mounted on the first water inlet pipe, and the first water inlet pipe is communicated with a main water delivery pipe 10; a ball valve II is arranged on the water delivery main pipe 10;
as shown in fig. 3, the multistage screw conveying cleaning member 7 is installed at the rear end of the classifying screen pre-cleaning member 6; the multi-stage spiral conveying and cleaning member 7 comprises an inclined bottom frame 708, wherein the left end of the inclined bottom frame 708 is higher than the right end, so that an inclined structure with a high left end and a low right end is formed; an inclined box body 701 is arranged on the inclined underframe 708; two partition plates 702 are arranged in the inclined box body 701 along the longitudinal direction, and the inclined box body 701 is divided into a first cleaning bin, a second cleaning bin and a third cleaning bin; a first screw conveyor 703, a second screw conveyor 704 and a second screw conveyor 705 are arranged in the first cleaning bin, the second cleaning bin and the third cleaning bin; the inner ends of the first screw conveyor 703, the second screw conveyor 704 and the second screw conveyor 705 are respectively provided with a first gear 706, a second gear 707 and a third gear 708; the first gear 706, the second gear 707 and the third gear 708 are meshed with each other; the second gear 707 is connected with the output end of the motor 709; a first sand outlet 603, a second sand outlet and a third sand outlet 606 in front of the screening box 601 are arranged above inlets at the inner side ends of the first cleaning bin, the second cleaning bin and the third cleaning bin; a water pipe shaped like a Chinese character feng is arranged on the inner wall of the top surface of the inclined box body 701, and a plurality of second nozzles are arranged on the bottom surface of the water pipe shaped like a Chinese character feng; a plurality of water guide holes are formed in the inclined box body 701; and a second water inlet is formed in the middle of the top surface of the inclined box body 701 and is connected with a second water delivery pipe, and the second water delivery pipe is connected with the main water delivery pipe 10.
Further, the feeding mechanism 2 comprises a supporting frame, the supporting frame is composed of four supporting rods 202, and the four supporting rods 202 are fixedly arranged at four corners of the front end of the surface of the frame platform 4 and fixed through screws; square frame fence 201 is installed on braced frame's top, and articulated on square frame fence 201's the four sides have a fence board, and feeder hopper 203 is installed to square frame fence 201 bottom.
Further, the left end of the first filtering vibration screen 602 is lower than the right end, so that an oblique vibration screen with a structure that the left end is lower than the right end is formed.
Furthermore, the left and right side ends of the second filtering vibrating screen 604 are inclined towards the middle to form a vibrating screen with a bidirectional opposite inclined structure.
Further, the left end of the third filtering vibrating screen 605 is higher than the right end, so as to form an oblique vibrating screen with a structure of high left and low right.
The working principle of the utility model is as follows:
in the design, the sand making machine body comprises a feeding mechanism and a crushing mechanism; the feeding mechanism is connected with the crushing mechanism 5 through a conveyor belt assembly I3; it also includes a cleaning assembly; the cleaning assembly is arranged at the rear end of the crushing mechanism; the cleaning component consists of a grading screening pre-cleaning component 6 and a multi-stage spiral conveying cleaning component 7; the classified screening pre-cleaning component 6 is arranged at the rear end of the crushing mechanism 5, and the multistage spiral conveying cleaning component 7 is arranged at the rear end of the classified screening pre-cleaning component 6; the rear end of the multi-stage spiral conveying and cleaning component 7 is provided with three horizontally arranged conveying belt mechanisms 8.
When the crusher is used, materials reach the crushing mechanism through the feeding mechanism to be crushed; the feeding mechanism and the crushing mechanism in the design are conventional equipment in sand making machinery.
After the material is crushed by the crushing mechanism, sand grains with different sizes are formed, and dirt and dust are wrapped on the sand grains. The sand grains with different sizes are guided into a classifying and screening pre-cleaning component 6, classified and screened by a first filtering vibration screen 602, a second filtering vibration screen 604 and a third filtering vibration screen 605, and respectively guided into a first filtering cavity, a second filtering cavity and a third filtering cavity.
In the design, the meshes of the first filtering and vibrating screen 602 are circular, and the diameter is 0.5-1 mm; the meshes of the second filtering and vibrating screen 604 are circular, and the diameter is 0.25-0.5 mm; the meshes of the third filtering and vibrating screen 605 are circular, and the diameter is 0.125-0.25 mm; thereby forming classification of coarse sand, medium sand and fine sand. Meanwhile, the water inlet of the water delivery main pipe 10 is controlled, the water is guided into the square spraying plate 9 and is sprayed out from the first nozzle to clean the first filter cavity, the second filter cavity and the third filter cavity, so that primary cleaning is formed, and the cleaned sewage passes through the sewage outlet 613 on one side of the bottom surface of the screening box 601 and is discharged through the sewage discharge pipe 611.
Then guiding the coarse sand in the first cleaning cavity, the medium sand in the second cleaning cavity and the fine sand in the third cleaning cavity to the first cleaning bin, the second cleaning bin and the third cleaning bin through the first sand outlet 603, the second sand outlet and the third sand outlet 606 respectively, controlling the motor to work, driving the second gear to rotate, driving the first gear and the third gear which are meshed with each other to work, controlling the first spiral conveyor 703, the second spiral conveyor 704 and the second spiral conveyor 705 to convey, controlling the second nozzle on the bottom surface of the 'feng' shaped water pipe while conveying, and performing secondary cleaning on the coarse sand, the medium sand and the fine sand in the first cleaning bin, the second cleaning bin and the third cleaning bin, wherein the cleaned sewage is discharged from a water guide pipe inclined to the bottom surface of the box body 701. The front end and the rear end of the inclined box body 701 are open ends, so that sand can be conveniently fed and discharged; this design adopts the design of second grade washing to guarantee clear laundry quality, can grade the grains of sand simultaneously again, carry to ground storage point through three horizontally arranged's conveyer belt mechanism 8 at last and save.
The utility model relates to a sand making machine, which adopts a sand washing mechanism arranged behind a crushing mechanism of a sand making mechanism to realize the cleaning of sand grains; the sand washing machine has the advantages of being convenient to use, fast in sand washing speed, capable of achieving the effect that two crushing and sand washing are combined into one, forming a flowing water effect and greatly improving the working efficiency.
The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.
Claims (5)
1. A sand making machine comprises a sand making machine body, wherein the sand making machine body comprises a feeding mechanism and a crushing mechanism; the feeding mechanism and the crushing mechanism are arranged on the front part and the rear part of the frame platform, and four wheels are correspondingly arranged on the front side and the rear side of the frame platform; the feeding mechanism is connected with the crushing mechanism through a first conveying belt assembly; one end of the feeding mechanism is hinged with an inclined plate ladder;
the method is characterized in that: it also includes a cleaning assembly; the cleaning assembly is arranged at the rear end of the crushing mechanism and consists of a graded screening pre-cleaning component and a multi-stage spiral conveying cleaning component;
the classified screening pre-cleaning component comprises a screening box, and the top end and the bottom end of the screening box are in an open shape; the upper part, the middle part and the lower part in the screening box are respectively provided with a first filtering vibration screen, a second filtering vibration screen and a third filtering vibration screen which are used for separating a first filtering cavity, a second filtering cavity and a third filtering cavity; the inner walls of the two side surfaces of the first filter cavity, the second filter cavity and the third filter cavity are correspondingly provided with guide rails; a first scraper, a second scraper and a third scraper are respectively arranged on the guide rails of the first filter cavity, the second filter cavity and the third filter cavity; the top ends of the first scraper, the second scraper and the third scraper are horizontally arranged, and the bottom end shapes of the first scraper, the second scraper and the third scraper are matched with the shapes of the first filtering vibrating screen, the second filtering vibrating screen and the third filtering vibrating screen;
the middle parts of the back surfaces of the first filter cavity, the second filter cavity and the third filter cavity are respectively provided with a first shaft hole, a second shaft hole and a third shaft hole; the middle parts of the back surfaces of the first filter cavity, the second filter cavity and the third filter cavity are respectively provided with a first air cylinder, a second air cylinder and a third air cylinder; piston rods of the first air cylinder, the second air cylinder and the third air cylinder respectively penetrate through the first shaft hole, the second shaft hole and the third shaft hole and are connected with the middle parts of the back surfaces of the first scraper blade, the second scraper blade and the third scraper blade; a first sand outlet, a second sand outlet and a third sand outlet are respectively arranged on the left side of the front of the first filter cavity, the middle part of the front of the second filter cavity and the right side of the front of the third filter cavity;
a square spraying plate is arranged above the screening box, and the right side end of the square spraying plate is connected with the left side end of the crushing mechanism; the bottom surface of the square spraying plate is provided with a plurality of first nozzles; the middle of the top surface of the square spraying plate is provided with a first water inlet, a first water inlet pipe is arranged on the first water inlet, a first ball valve is arranged on the first water inlet pipe, and the first water inlet pipe is communicated with a water delivery main pipe; a ball valve II is arranged on the water delivery main pipe;
the multi-stage spiral conveying cleaning component is arranged at the rear end of the graded screening pre-cleaning component; the multistage spiral conveying and cleaning component comprises an inclined bottom frame, wherein the left end of the inclined bottom frame is higher than the right end of the inclined bottom frame to form an inclined structure with a high left end and a low right end; an inclined box body is arranged on the inclined underframe; two partition plates are arranged in the inclined box body along the longitudinal direction, and the inclined box body is divided into a first cleaning bin, a second cleaning bin and a third cleaning bin; a first screw conveyor, a second screw conveyor and a second screw conveyor are arranged in the first cleaning bin, the second cleaning bin and the third cleaning bin; the inner ends of the first spiral conveyor, the second spiral conveyor and the second spiral conveyor are respectively provided with a first gear, a second gear and a third gear; the first gear, the second gear and the third gear are meshed with each other; the second gear is connected with the output end of the motor; the first sand outlet, the second sand outlet and the third sand outlet in front of the screening box are arranged above the inlets at the inner side ends of the first cleaning bin, the second cleaning bin and the third cleaning bin; the inner wall of the top surface of the inclined box body is provided with a water pipe shaped like a Chinese character feng, and the bottom surface of the water pipe shaped like a Chinese character feng is provided with a plurality of second nozzles; a plurality of water guide holes are formed in the inclined box body; and a second water inlet is formed in the middle of the top surface of the inclined box body, the second water inlet is connected with a second water conveying pipe, and the second water conveying pipe is connected with a main water conveying pipe.
2. A sand making machine according to claim 1, wherein: the feeding mechanism comprises a supporting frame, the supporting frame consists of four supporting rods, and the four supporting rods are fixedly arranged at four corners of the front end of the surface of the frame platform and are fixed through screws; square frame fence is installed on braced frame's top, and it has the fence board to articulate on the four borders of square frame fence, and the feeder hopper is installed to square frame fence bottom.
3. A sand making machine according to claim 1, wherein: and the left end of the first filtering vibration screen is lower than the right end to form a slant vibration screen with a structure of low left and high right.
4. A sand making machine according to claim 1, wherein: and the left side end and the right side end of the second filtering vibration screen are inclined towards the middle to form the vibration screen with a bidirectional opposite inclined structure.
5. A sand making machine according to claim 1, wherein: and the left end of the filtering vibrating screen III is higher than the right end to form an oblique vibrating screen with a structure of high left and low right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920597890.7U CN209810398U (en) | 2019-04-28 | 2019-04-28 | Sand making machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920597890.7U CN209810398U (en) | 2019-04-28 | 2019-04-28 | Sand making machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209810398U true CN209810398U (en) | 2019-12-20 |
Family
ID=68881979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920597890.7U Expired - Fee Related CN209810398U (en) | 2019-04-28 | 2019-04-28 | Sand making machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209810398U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112742595A (en) * | 2020-12-29 | 2021-05-04 | 浙江林龙物流有限公司 | Clean high-efficient sand washing device |
| CN114082517A (en) * | 2021-10-19 | 2022-02-25 | 怀化市正诚建材有限公司 | Multistage efficient sand washing device |
-
2019
- 2019-04-28 CN CN201920597890.7U patent/CN209810398U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112742595A (en) * | 2020-12-29 | 2021-05-04 | 浙江林龙物流有限公司 | Clean high-efficient sand washing device |
| CN114082517A (en) * | 2021-10-19 | 2022-02-25 | 怀化市正诚建材有限公司 | Multistage efficient sand washing device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191220 Termination date: 20200428 |
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| CF01 | Termination of patent right due to non-payment of annual fee |