CN216474350U - A pitch agitating unit for road surface construction - Google Patents
A pitch agitating unit for road surface construction Download PDFInfo
- Publication number
- CN216474350U CN216474350U CN202123102937.4U CN202123102937U CN216474350U CN 216474350 U CN216474350 U CN 216474350U CN 202123102937 U CN202123102937 U CN 202123102937U CN 216474350 U CN216474350 U CN 216474350U
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- fixedly connected
- bottom plate
- pipe
- stirring
- feeding
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 57
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims description 35
- 238000010521 absorption reaction Methods 0.000 claims description 30
- 239000010426 asphalt Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000011324 bead Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 3
- 238000007790 scraping Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model relates to an agitated vessel technical field provides a pitch agitating unit for road surface construction, comprising a base plate, drive arrangement is installed to bottom plate up end one end, rotating device is installed to bottom plate up end inner chamber, the equal fixedly connected with support column of bottom plate up end, support column up end fixedly connected with roof, agitating unit is installed to the drive arrangement up end, and loading attachment is installed to bottom plate up end one end, getter device is installed to roof up end one end, the terminal surface mid-mounting has discharging device under the rotating device, and through above-mentioned technical scheme, a pitch agitating unit for road surface construction among the solution prior art stirs inhomogeneous and inconvenient stirring material on the inner wall and strikes off and need artifical problem of making a round trip to transport the teeter chamber with pitch easily.
Description
Technical Field
The utility model relates to a agitated vessel technical field, it is specific, relate to a pitch agitating unit for road surface construction.
Background
Asphalt can be frequently used in the process of road construction, the asphalt needs to be stirred by a stirring device before being used, and when stirring, the inside of the stirring device still needs to be heated, because the fluidity of the asphalt is poor, the existing stirring device is easy to stir unevenly when being stirred and mixed, so that the produced product quality is poor, the inconvenience is brought to scraping of stirring materials remained on the inner wall, the long-term use of the device is influenced, workers need to manually transport the asphalt back and forth when transporting the asphalt into a stirring chamber, and the consumption of large labor force is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pitch agitating unit for road surface construction has solved a pitch agitating unit for road surface construction among the correlation technique and has stirred inhomogeneous and inconvenient stirring material on the inner wall easily and strike off and need artifical round trip to transport the problem of teeter chamber with pitch.
The technical scheme of the utility model as follows: the utility model provides a pitch agitating unit for road surface construction, includes the bottom plate, drive arrangement is installed to bottom plate up end one end, rotating device is installed to bottom plate up end inner chamber, the equal fixedly connected with support column of bottom plate up end, support column up end fixedly connected with roof, agitating unit is installed to the drive arrangement up end, and loading attachment is installed to bottom plate up end one end, getter device is installed to roof up end one end, the terminal surface mid-mounting has discharging device under the rotating device.
Preferably, the lower end face of the bottom plate is fixedly connected with supporting legs, and universal wheels are mounted in the middle of the lower end faces of the supporting legs.
Preferentially, drive arrangement comprises driving motor, actuating lever and driving gear, bottom plate up end one end fixedly connected with driving motor, driving motor output shaft fixedly connected with actuating lever, actuating lever surface fixed connection has the driving gear.
Preferentially, rotating device comprises rotation post, rotation pearl, teeter chamber, driven gear and hot plate, the bottom plate inner chamber all rotates and is connected with the rotation post, rotate the post inner chamber and install the rotation pearl, it contacts with bottom plate inner chamber bottom to rotate pearl surface, rotate post up end fixedly connected with teeter chamber, the outer fixed surface of teeter chamber is connected with driven gear, teeter chamber inner chamber fixedly connected with hot plate, driven gear is connected with driving gear engagement, the teeter chamber up end rotates with the roof and is connected.
Preferentially, agitating unit comprises action wheel, follow driving wheel, belt, fixed column, puddler and scraper blade, actuating lever up end fixedly connected with action wheel, roof up end middle part fixedly connected with follows the driving wheel, action wheel and follow driving wheel surface cover have the belt, be fixed with the fixed column from driving wheel down end middle part, the fixed column other end runs through the roof up end, the equal fixedly connected with puddler of fixed column surface, puddler one side fixedly connected with scraper blade.
Preferably, the feeding device comprises a supporting block, a feeding groove, a feeding pipe, a feeding motor and a spiral conveying blade, one end of the upper end face of the bottom plate is fixedly connected with the supporting block, the upper end face of the supporting block is fixedly connected with the feeding groove, one side of the feeding groove is fixedly connected with the feeding pipe, the lower end of the feeding pipe is fixedly connected with the feeding motor, the output shaft end of the feeding motor is fixedly connected with the spiral conveying blade, and the other end of the feeding pipe is communicated with the top plate.
Preferentially, the getter device comprises a getter pump, a hose, an absorption box, a liquid inlet pipe, a pipe cover, a liquid discharge pipe and a liquid discharge valve, wherein the getter pump is fixedly connected with one end of the upper end face of the top plate, the getter pump suction port is communicated with the top plate through the hose, the gas transmission port of the getter pump is communicated with the absorption box through the hose, the liquid inlet pipe is communicated with one end of the upper end face of the absorption box, one end of the liquid inlet pipe is in threaded connection with the pipe cover, the liquid discharge pipe is communicated with one end of the rear end face of the absorption box, the liquid discharge valve is installed in the inner cavity of the liquid discharge pipe, and the lower end face of the absorption box is fixedly connected with the bottom plate.
Preferentially, discharging device comprises discharging pipe and ejection of compact valve, terminal surface middle part intercommunication has the discharging pipe under the teeter chamber, the discharging pipe other end runs through the bottom plate up end and rotates with the bottom plate to be connected, ejection of compact valve is installed to the discharging pipe inner chamber.
The utility model discloses a theory of operation and beneficial effect do:
1. in the utility model, the bottom plate is firstly pushed, the device is driven to move integrally through the matching of the supporting legs and the universal wheels, when the device moves to a designated position, the feeding motor is started, when the feeding motor is started, the spiral conveying blade is driven to rotate, then the asphalt to be stirred is put into the feeding groove, the asphalt to be stirred enters the feeding pipe through the feeding groove, the asphalt to be stirred is conveyed upwards into the stirring chamber through the spiral conveying blade, the labor intensity of people is reduced, when the asphalt is completely put into the stirring chamber, the driving motor is started, when the driving motor is started, the stirring chamber is driven to rotate through the matching of the driving gear and the driven gear, through the matching of the rotating column and the rotating bead, the resistance when the stirring chamber rotates is reduced, meanwhile, through the matching of the driving wheel, the belt and the driven wheel, the rotating column is driven to rotate, when the rotating column rotates, the stirring rod is driven to reversely stir the asphalt, when the stirring rod rotates, the scraper blade is driven to rotate to scrape the inner wall of the stirring chamber, so that asphalt is prevented from being adhered to the inner wall, when the driving motor is started, the driving motor rotates back and forth to avoid winding of an electric wire of the heating plate, when the asphalt is stirred, the heating plate is used for heating and heat preservation, the stirring efficiency of the asphalt is improved through the matching of the stirring chamber and the stirring rod, when the asphalt is heated and stirred again, pungent smell is usually generated, at the moment, the air suction pump is started, the pungent smell generated in the stirring chamber is sucked into the absorption box through the hose, the absorption liquid in the absorption box is treated, the harm to a human body is reduced, when the absorption liquid needs to be replaced, the liquid discharge valve is opened to discharge waste absorption liquid through the liquid discharge pipe, then the pipe cover is rotated to open, and new absorption liquid enters the absorption box through the liquid inlet pipe, after the stirring of pitch was accomplished, through opening discharge valve, discharge pitch from the discharging pipe, make things convenient for the staff to use.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a rear view of the overall structure of the present invention;
FIG. 3 is a schematic view of the internal structure of the half-section of the present invention;
fig. 4 is a schematic view of the structure of the rotating bead of the present invention.
In the figure: 1. a base plate; 2. supporting legs; 3. a universal wheel; 4. a drive device; 41. a drive motor; 42. a drive rod; 43 a drive gear; 5. a rotating device; 51. rotating the column; 52. rotating the beads; 53. a stirring chamber; 54. a driven gear; 55. heating plates; 6. a support pillar; 7. a top plate; 8. a stirring device; 81. a driving wheel; 82. a driven wheel; 83. a belt; 84. fixing a column; 85. a stirring rod; 86. a squeegee; 9. a feeding device; 91. a support block; 92. a feeding trough; 93. feeding pipes; 94. a feeding motor; 95. a spiral conveying blade; 10. a suction device; 101. a getter pump; 102. a hose; 103. an absorption box; 104. a liquid inlet pipe; 105. a tube cover; 106. a liquid discharge pipe; 107 drain valves; 11. a discharging device; 111. a discharge pipe; 112. and a discharge valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, are related to the scope of the present invention.
Example 1
As shown in fig. 1 to 4, the present embodiment provides an asphalt mixing device for road surface construction, which includes a bottom plate 1, and is characterized in that: the automatic feeding device comprises a base plate 1, a driving device 4, a rotating device 5, a supporting column 6, a top plate 7, a stirring device 8, a feeding device 9, a gas suction device 10, a discharging device 11, a supporting leg 2, a universal wheel 3, a driving device 4, a driving motor 41, a driving rod 42 and a driving gear 43, wherein the driving device 4 is installed at one end of the upper end face of the base plate 1, the supporting column 6 is fixedly connected with the upper end face of the supporting column 6, the stirring device 8 is installed at the upper end face of the driving device 4, the feeding device 9 is installed at one end of the upper end face of the base plate 1, the gas suction device 10 is installed at one end of the upper end face of the top plate 7, the discharging device 11 is installed at the middle part of the lower end face of the rotating device 5, the supporting leg 2 is fixedly connected with the supporting leg 2, the universal wheel 3 is installed at the middle part of the lower end face of the supporting leg 2, the driving device 4 is composed of the driving motor 41, the driving rod 42 and the driving gear 43, the driving motor 41 is fixedly connected with the driving rod 42, the driving gear 42, the output shaft 42, the outer surface of the rotating device 5 is composed of a rotating column 51, a rotating column, The stirring device comprises a rotating ball 52, a stirring chamber 53, a driven gear 54 and a heating plate 55, wherein the inner cavity of the bottom plate 1 is rotatably connected with a rotating column 51, the rotating ball 52 is arranged in the inner cavity of the rotating column 51, the outer surface of the rotating ball 52 is contacted with the bottom of the inner cavity of the bottom plate 1, the stirring chamber 53 is fixedly connected with the upper end surface of the rotating column 51, the driven gear 54 is fixedly connected with the outer surface of the stirring chamber 53, the heating plate 55 is fixedly connected with the inner cavity of the stirring chamber 53, the driven gear 54 is meshed with the driving gear 43, the upper end surface of the stirring chamber 53 is rotatably connected with the top plate 7, the stirring device 8 comprises a driving wheel 81, a driven wheel 82, a belt 83, a fixed column 84, a stirring rod 85 and a scraping plate 86, the driving wheel 81 is fixedly connected with the upper end surface of the driving rod 42, the driven wheel 82 is fixedly connected with the middle part of the upper end surface of the top plate 7, the belt 83 is sleeved on the outer surfaces of the driving wheel 81 and the driven wheel 82, the fixed column 84 is fixed in the middle part of the lower end surface of the driven wheel 82, the other end of the fixing column 84 penetrates through the upper end face of the top plate 7, the outer surface of the fixing column 84 is fixedly connected with a stirring rod 85, and a scraper blade 86 is fixedly connected to one side of the stirring rod 85.
In the embodiment, the bottom plate 1 is firstly pushed, the device is driven to integrally move through the matching of the supporting legs 2 and the universal wheels 3, when the device moves to a designated position, when the driving motor 41 is started, the stirring chamber 53 is driven to rotate through the matching of the driving gear 43 and the driven gear 54, the resistance of the stirring chamber 53 in rotation is reduced through the matching of the rotating column 51 and the rotating bead 52, meanwhile, the fixing column 84 is driven to rotate through the matching of the driving wheel 81, the belt 83 and the driven wheel 82, when the fixing column 84 rotates, the stirring rod 85 is driven to rotate to reversely stir asphalt, when the stirring rod 85 rotates, the scraping plate 86 is driven to rotate, the inner wall of the stirring chamber 53 is scraped, the asphalt is prevented from being adhered to the inner wall, when the driving motor 41 is started, the reverse rotation is carried out back and forth, the electric wire of the heating plate 55 is prevented from being wound, when the asphalt is stirred, the heating plate 55 is used for heating and heat preservation, the mixing efficiency of the asphalt is increased by the cooperation of the mixing chamber 53 and the mixing rod 85.
Example 2
As shown in fig. 1 to 3, based on the same concept as that of the above embodiment 1, this embodiment further proposes that the feeding device 9 is composed of a supporting block 91, a feeding groove 92, a feeding pipe 93, a feeding motor 94 and a spiral conveying blade 95, one end of the upper end surface of the bottom plate 1 is fixedly connected with the supporting block 91, the upper end surface of the supporting block 91 is fixedly connected with the feeding groove 92, one side of the feeding groove 92 is fixedly connected with the feeding pipe 93, the lower end of the feeding pipe 93 is fixedly connected with the feeding motor 94, the output shaft of the feeding motor 94 is fixedly connected with the spiral conveying blade 95, the other end of the feeding pipe 93 is connected with the top plate 7 in a communicating manner, the suction device 10 is composed of a suction pump 101, a hose 102, an absorption box 103, a liquid inlet pipe 104, a pipe cover 105, a liquid outlet pipe 106 and a liquid outlet valve 107, one end of the upper end surface of the top plate 7 is fixedly connected with the suction pump 101, the suction port of the suction pump 101 is communicated with the top plate 7 through the hose 102, the suction port is communicated with the absorption box 103 through the hose 102, absorption box 103 up end one end intercommunication has feed liquor pipe 104, feed liquor pipe 104 one end threaded connection has tube cap 105, absorption box 103 rear end face one end intercommunication has fluid-discharge tube 106, fluid-discharge valve 107 is installed to fluid-discharge tube 106 inner chamber, absorption box 103 lower extreme face and bottom plate 1 fixed connection, discharging device 11 comprises discharging pipe 111 and discharge valve 112, terminal surface middle part intercommunication has discharging pipe 111 under the teeter chamber 53, the discharging pipe 111 other end runs through bottom plate 1 up end and is connected with bottom plate 1 rotation, discharge valve 112 is installed to discharging pipe 111 inner chamber.
In this embodiment, the feeding motor 94 is started, when the feeding motor 94 is started, the screw conveying blade 95 is driven to rotate, at this time, the asphalt to be stirred is placed in the feeding groove 92, enters the feeding pipe 93 through the feeding groove 92, is conveyed upwards into the stirring chamber 53 through the screw conveying blade 95, the labor intensity of people is reduced, when the asphalt is heated and stirred, pungent odor is usually generated, at this time, the air suction pump 101 is started, the pungent odor generated in the stirring chamber 53 is sucked into the absorption box 103 through the hose 102, the absorption liquid in the absorption box 103 is treated, the harm to human bodies is reduced, when the absorption liquid needs to be replaced, the liquid discharge valve 107 is opened to discharge the waste absorption liquid through the liquid discharge pipe 106, then the pipe cover 105 is rotated to open, and new absorption liquid enters the absorption box 103 through the liquid inlet pipe 104, after the stirring of pitch is accomplished, through opening discharge valve 112, discharge pitch from discharging pipe 111, make things convenient for the staff to use.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an asphalt mixing device for road surface construction, includes bottom plate (1), its characterized in that: drive arrangement (4) are installed to bottom plate (1) up end one end, rotating device (5) are installed to bottom plate (1) up end inner chamber, equal fixedly connected with support column (6) of bottom plate (1) up end, support column (6) up end fixedly connected with roof (7), agitating unit (8) are installed to drive arrangement (4) up end, and loading attachment (9) are installed to bottom plate (1) up end one end, getter device (10) are installed to roof (7) up end one end, terminal surface mid-mounting has discharging device (11) under rotating device (5).
2. An asphalt mixing device for road surface construction according to claim 1, wherein the lower end surfaces of the bottom plates (1) are fixedly connected with supporting legs (2), and universal wheels (3) are arranged in the middle of the lower end surfaces of the supporting legs (2).
3. The asphalt mixing device for road surface construction according to claim 1, wherein the driving device (4) is composed of a driving motor (41), a driving rod (42) and a driving gear (43), one end of the upper end surface of the base plate (1) is fixedly connected with the driving motor (41), the output shaft end of the driving motor (41) is fixedly connected with the driving rod (42), and the outer surface of the driving rod (42) is fixedly connected with the driving gear (43).
4. The asphalt mixing device for road surface construction according to claim 3, the rotating device (5) consists of a rotating column (51), a rotating bead (52), a stirring chamber (53), a driven gear (54) and a heating plate (55), the inner cavities of the bottom plates (1) are respectively and rotatably connected with a rotating column (51), the inner cavity of the rotating column (51) is provided with a rotating bead (52), the outer surface of the rotating ball (52) is contacted with the bottom of the inner cavity of the bottom plate (1), the upper end surface of the rotating column (51) is fixedly connected with a stirring chamber (53), the outer surface of the stirring chamber (53) is fixedly connected with a driven gear (54), stirring room (53) inner chamber fixedly connected with hot plate (55), driven gear (54) are connected with driving gear (43) meshing, stirring room (53) up end is rotated with roof (7) and is connected.
5. The asphalt stirring device for pavement construction according to claim 3, wherein the stirring device (8) is composed of a driving wheel (81), a driven wheel (82), a belt (83), a fixing column (84), a stirring rod (85) and a scraper (86), the driving wheel (81) is fixedly connected to the upper end face of the driving rod (42), the driven wheel (82) is fixedly connected to the middle of the upper end face of the top plate (7), the belt (83) is sleeved on the outer surfaces of the driving wheel (81) and the driven wheel (82), the fixing column (84) is fixedly connected to the middle of the lower end face of the driven wheel (82), the other end of the fixing column (84) penetrates through the upper end face of the top plate (7), the stirring rod (85) is fixedly connected to the outer surface of the fixing column (84), and the scraper (86) is fixedly connected to one side of the stirring rod (85).
6. The asphalt mixing device for road surface construction according to claim 1, wherein the feeding device (9) is composed of a supporting block (91), a feeding groove (92), a feeding pipe (93), a feeding motor (94) and a spiral conveying blade (95), one end of the upper end surface of the base plate (1) is fixedly connected with the supporting block (91), the upper end surface of the supporting block (91) is fixedly connected with the feeding groove (92), one side of the feeding groove (92) is fixedly connected with the feeding pipe (93), the lower end of the feeding pipe (93) is fixedly connected with the feeding motor (94), the output shaft end of the feeding motor (94) is fixedly connected with the spiral conveying blade (95), and the other end of the feeding pipe (93) is communicated with the top plate (7).
7. The asphalt mixing device for road surface construction according to claim 1, wherein the air suction device (10) is composed of an air suction pump (101), a hose (102), an absorption box (103), a liquid inlet pipe (104), a pipe cover (105), a liquid discharge pipe (106) and a liquid discharge valve (107), one end of the upper end surface of the top plate (7) is fixedly connected with the air suction pump (101), the air suction port of the air suction pump (101) is communicated with the top plate (7) through the hose (102), the air delivery port of the air suction pump (101) is communicated with the absorption box (103) through the hose (102), one end of the upper end surface of the absorption box (103) is communicated with the liquid inlet pipe (104), one end of the liquid inlet pipe (104) is in threaded connection with the pipe cover (105), one end of the rear end surface of the absorption box (103) is communicated with the liquid discharge pipe (106), and the liquid discharge valve (107) is installed in the inner cavity of the liquid discharge pipe (106), the lower end face of the absorption box (103) is fixedly connected with the bottom plate (1).
8. The asphalt mixing device for road surface construction according to claim 4, wherein the discharging device (11) is composed of a discharging pipe (111) and a discharging valve (112), the middle part of the lower end surface of the mixing chamber (53) is communicated with the discharging pipe (111), the other end of the discharging pipe (111) penetrates through the upper end surface of the bottom plate (1) and is rotatably connected with the bottom plate (1), and the discharging valve (112) is installed in the inner cavity of the discharging pipe (111).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123102937.4U CN216474350U (en) | 2021-12-07 | 2021-12-07 | A pitch agitating unit for road surface construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123102937.4U CN216474350U (en) | 2021-12-07 | 2021-12-07 | A pitch agitating unit for road surface construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216474350U true CN216474350U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123102937.4U Active CN216474350U (en) | 2021-12-07 | 2021-12-07 | A pitch agitating unit for road surface construction |
Country Status (1)
| Country | Link |
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| CN (1) | CN216474350U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116219830A (en) * | 2023-03-22 | 2023-06-06 | 重庆市江北区建设工程质量检测有限责任公司 | Automatic mixer for asphalt mixture |
-
2021
- 2021-12-07 CN CN202123102937.4U patent/CN216474350U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116219830A (en) * | 2023-03-22 | 2023-06-06 | 重庆市江北区建设工程质量检测有限责任公司 | Automatic mixer for asphalt mixture |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Shaojie Inventor after: Gao Xiang Inventor after: Guo Shijie Inventor after: Guo Zhen Inventor after: Shang Futao Inventor after: Zhang Jing Inventor after: Lu Degang Inventor after: Fu Shaohua Inventor after: Wang Hui Inventor after: Ji Jianmin Inventor after: Ren Mei Inventor after: Wang Dandan Inventor after: Lu Guanghui Inventor after: Liu Tao Inventor before: Wang Shaojie Inventor before: Gao Xiang Inventor before: Guo Shijie Inventor before: Guo Zhen Inventor before: Shang Futao Inventor before: Zhang Jing Inventor before: Lu Degang Inventor before: Fu Shaohua Inventor before: Wang Hui Inventor before: Ji Jianmin Inventor before: Ren Mei Inventor before: Wang Dandan Inventor before: Lu Guanghui Inventor before: Liu Tao |
|
| CB03 | Change of inventor or designer information | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An asphalt mixing device for road construction Granted publication date: 20220510 Pledgee: Handan Transportation Investment Group Co.,Ltd. Pledgor: HEBEI GUANGTAI ROAD AND BRIDGE ENGINEERING GROUP CO.,LTD. Registration number: Y2024980040519 |