CN211487412U - Modified asphalt strong shearing stirring device - Google Patents
Modified asphalt strong shearing stirring device Download PDFInfo
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- CN211487412U CN211487412U CN201921981550.0U CN201921981550U CN211487412U CN 211487412 U CN211487412 U CN 211487412U CN 201921981550 U CN201921981550 U CN 201921981550U CN 211487412 U CN211487412 U CN 211487412U
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Abstract
The utility model discloses a modified asphalt cuts agitating unit by force relates to pitch agitated vessel field. Be equipped with collection material jar, agitator tank and smoldering material jar, allotment to the proportion of pitch raw materials and modifier in the collection material jar during the use, pass through charge-in pipeline with the mixture of pitch raw materials and modifier inside the agitator tank after accomplishing the proportion allotment, drive the agitator tank through drive mechanism and carry out the rotation, stir the mixture of pitch raw materials and modifier in the agitator tank through rabbling mechanism, the direction of stirring of rabbling mechanism is opposite with the direction of rotation of agitator tank to carry out abundant strong shear stirring to the pitch raw materials and the modifier mixture in the agitator tank, make pitch raw materials and modifier intermixture form modified asphalt, the modified asphalt in the rethread ejection of compact pipeline with the agitator tank is carried to smoldering material jar in and is carried out smoldering, in order to increase modified asphalt's stability. The utility model discloses can improve the segregation phenomenon that modified asphalt takes place greatly, improve the storage stability of pitch.
Description
Technical Field
The utility model relates to a pitch agitated vessel field especially relates to a modified asphalt strong shear agitating unit.
Background
The asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetal derivatives thereof, is one of high-viscosity organic liquids, is in a liquid state, has a black surface, is soluble in carbon disulfide, is a waterproof, moistureproof and anticorrosive organic cementing material, and can be mainly divided into coal tar asphalt, petroleum asphalt and natural asphalt: among them, coal tar pitch is a by-product of coking. Petroleum asphalt is a residue after distillation of crude oil, natural asphalt is stored underground, some of which forms a mineral layer or is accumulated on the surface of the earth crust, and asphalt is mainly used in the industries of coatings, plastics, rubbers and the like, pavements and the like.
The modified asphalt is a polymer prepared by adding proper amount of different additives into common asphalt, and grinding, stirring and swelling the base asphalt and the additives for many times.
SUMMERY OF THE UTILITY MODEL
The utility model provides a modified asphalt cuts agitating unit by force to there is the technical problem of come-up or sinking phenomenon in pitch in the modifier when solving among the prior art preparation modified asphalt.
A modified asphalt strong shearing stirring device comprises a stirring tank, a material collecting tank, a material stewing tank, a feeding mechanical sealing cover, a discharging mechanical sealing cover, a stirring mechanism and a transmission mechanism, wherein the stirring tank is a cylinder penetrating through the middle part, two penetrating ports of the stirring tank are respectively provided with the feeding mechanical sealing cover and the discharging mechanical sealing cover, a sealed cavity is formed inside the stirring tank through the feeding mechanical sealing cover and the discharging mechanical sealing cover, the outer side of the stirring tank is provided with a circle of transmission tooth socket, the transmission mechanism is in transmission connection with the stirring tank through the transmission tooth socket, the stirring mechanism is transversely arranged inside the stirring tank through the feeding mechanical sealing cover and the discharging mechanical sealing cover, the material collecting tank is arranged beside the stirring tank and is positioned at one side provided with the feeding mechanical sealing cover, the bottom of the material collecting tank is provided with a feeding pipeline, the feeding pipeline is communicated to the inside of the stirring tank through, the side of collection material jar is equipped with two material ways, vexed material jar sets up in the agitator tank and is located the one side that is equipped with the sealed lid of ejection of compact machinery, the sealed lid department of ejection of compact machinery is equipped with the ejection of compact pipeline, ejection of compact pipeline intercommunication vexed material jar and agitator tank.
Further, the periphery of agitator tank is equipped with a heating enclosing cover, be equipped with the round heating rod in the heating enclosing cover, the heating rod is located between heating enclosing cover and the agitator tank.
Further, the bottom of the material collecting tank is provided with a first support frame, the bottom of the stirring tank is provided with a second support frame, and the first support frame is higher than the second support frame.
Further, rabbling mechanism comprises agitator motor, puddler, stirring leaf, agitator motor installs ejection of compact mechanical seal covers, the puddler passes feeding mechanical seal lid and ejection of compact mechanical seal lid respectively and is connected with the agitator motor transmission, the stirring leaf is equipped with a plurality ofly, and is a plurality of the stirring leaf sets up inside the agitator tank and is connected with the puddler transmission.
Further, drive mechanism installs on the second support frame, drive mechanism comprises drive motor, drive gear, transfer line and transmission location bearing, the transfer line is installed on the drive motor, the transfer line with the drive motor transmission is connected, drive gear fixes on the transfer line, transmission location bearing is equipped with two, two transmission location bearing is equipped with on the transfer line and is located drive gear's both sides, the bottom of transmission location bearing is fixed on the second support frame, drive gear with transmission tooth's socket intermeshing.
Further, be equipped with stop device on the second support frame, stop device includes and comprises spacing gyro wheel, gyro wheel location bearing and gag lever post, spacing gyro wheel is installed the centre of gag lever post, gyro wheel location bearing is equipped with two, two gyro wheel location bearing installs on the gag lever post and is located the both ends of spacing gyro wheel, stop device is equipped with four, four stop device installs on the second support frame, the periphery of agitator tank is equipped with two contact rings, four stop device and two contact ring contact each other.
Further, the top of the material collecting tank is provided with a first waste gas discharge pipeline, and the top of the mechanical sealing cover for discharging is provided with a second waste gas discharge pipeline.
Furthermore, a large number of convex blocks are arranged on the inner wall of the stirring tank.
Further, the agitator tank is the slope setting, the one end of installing the sealed lid of feeding machinery in the agitator tank is higher than the one end of the sealed lid of ejection of compact machinery.
Further, a heating device is arranged inside the stewing tank.
Compared with the prior art, the beneficial effects of the utility model reside in that:
one, the utility model is provided with a material collecting tank, a stirring tank and a stewing tank, when in use, the proportion of the asphalt raw material and the modifier is allocated in the material collecting tank, after the proportion allocation is completed, the mixture of the asphalt raw material and the modifier is conveyed to the inner part of the stirring tank through a feeding pipeline, the stirring tank is driven by the transmission mechanism to rotate, the mixture of the asphalt raw material and the modifier in the stirring tank is stirred by the stirring mechanism, the stirring direction of the stirring mechanism is opposite to the rotating direction of the stirring tank, thereby the mixture of the asphalt raw material and the modifier in the stirring tank is fully and forcibly sheared and stirred, the asphalt raw material and the modifier are mixed with each other to form modified asphalt, the modified asphalt in the stirring tank is conveyed to a material sealing tank through a discharge pipeline for material sealing, so as to increase the stability of the modified asphalt and effectively solve the technical problem that the modifier floats upwards or sinks in the asphalt when the modified asphalt is prepared in the prior art.
And secondly, the utility model discloses still be equipped with a plurality of protruding pieces on the inner wall of agitator tank, when the mixture of asphalt raw materials and modifier goes into agitator tank inside, the agitator tank rotated, and the asphalt raw materials constantly strikes with the protruding piece with the modifier in agitator tank inside to promote the abundant reaction fusion of asphalt raw materials and modifier, increased the utility model discloses a work efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a stirring tank of the present invention;
fig. 3 is a schematic sectional view of the heating cover of the present invention;
FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;
FIG. 5 is a schematic view of a split structure of the stirring tank of the present invention;
fig. 6 is a front view of the present invention;
FIG. 7 is a schematic structural view of the material collecting tank of the present invention;
fig. 8 is a schematic structural view of a second support frame of the present invention;
FIG. 9 is an enlarged view of the structure at B in FIG. 8;
reference numerals: the device comprises a stirring tank 1, a feeding mechanical sealing cover 11, a discharging mechanical sealing cover 12, a transmission tooth socket 13, a second support frame 14, a contact ring 15, a convex block 16, a material collecting tank 2, a feeding pipeline 21, a material channel 22, a first support frame 23, a material stewing tank 3, a discharging pipeline 31, a heating device 32, a stirring mechanism 4, a stirring motor 41, a stirring rod 42, a stirring blade 43, a transmission mechanism 5, a transmission motor 51, a transmission gear 52, a transmission rod 53, a transmission positioning bearing 54, a heating outer cover 6, a heating rod 61, a limiting device 7, a limiting roller 71, a roller positioning bearing 72, a limiting rod 73, a first waste gas discharge pipeline 81 and a second waste gas discharge pipeline 82.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.
The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides a modified asphalt strong shear agitating unit, includes agitator tank 1, collection material jar 2, stifled material jar 3, feeding mechanical seal lid 11, ejection of compact mechanical seal lid 12, rabbling mechanism 4 and drive mechanism 5, agitator tank 1 is the cylinder that the middle part runs through, two through-hole departments of agitator tank 1 install feeding mechanical seal lid 11 and ejection of compact mechanical seal lid 12 respectively, make agitator tank 1 inside form a sealed cavity through feeding mechanical seal lid 11 and ejection of compact mechanical seal lid 12, the outside of agitator tank 1 is equipped with round transmission tooth's socket 13, drive mechanism 5 is connected with agitator tank 1 transmission through transmission tooth's socket 13, rabbling mechanism 4 transversely sets up in agitator tank 1's inside through feeding mechanical seal lid 11, ejection of compact mechanical seal lid 12, collection material jar 2 sets up by agitator tank 1 and is located the one side that is equipped with feeding mechanical seal lid 11, the bottom of collection material jar 2 is equipped with charge-in pipeline 21, charge-in pipeline 21 leads to 1 inside to the agitator tank through the sealed lid 11 of feeding machinery, the side of collection material jar 2 is equipped with two material ways 22, and two material ways 22 communicate pitch raw materials and modifier respectively, vexed material jar 3 sets up at agitator tank 1 and is located the one side that is equipped with the sealed lid 12 of ejection of compact machinery, the sealed lid 12 department of ejection of compact machinery is equipped with ejection of compact pipeline 31, ejection of compact pipeline 31 intercommunication vexed material jar 3 and agitator tank 1.
The utility model discloses when using, through two material way 22 to the asphalt raw materials and the modifier of the corresponding proportion of input in the material collecting tank 2 to feed pipe 21 through material collecting tank 2 bottom gets into agitator tank 1, starts drive mechanism 5, drives agitator tank 1 through drive mechanism 5 and carries out the rotation, restarts agitator mechanism 4, stirs through agitator mechanism 41 inside asphalt raw materials and modifier, makes the asphalt raw materials stir the modification with the modifier, agitator tank 1 is the opposite direction rotation with agitator mechanism 4 to make 1 inside asphalt of agitator tank and modifier carry out abundant fusion reaction, the modified asphalt after accomplishing the fusion reaction carries out through ejection of compact pipeline 31 and goes into to carry out the material processing in stifled material jar 3, with this modified operation of accomplishing the asphalt raw materials.
Preferably, agitator tank 1's periphery is equipped with a heating enclosing cover 6, be equipped with round heating rod 61 in the heating enclosing cover 6, heating rod 61 is located between heating enclosing cover 6 and the agitator tank 1, works as pitch raw materials and modifier start-up heating rod 61 after getting into agitator tank 1, heat 1 inside through heating rod 61 to the agitator tank, promote the fusion reaction of pitch raw materials and modifier, increase the utility model discloses a work efficiency.
Preferably, the bottom of the material collecting tank 2 is provided with a first support frame 23, the height of the material collecting tank 2 is increased through the first support frame 23, the bottom of the stirring tank 1 is provided with a second support frame 14, the height of the stirring tank 1 is increased through the second support frame 14, the first support frame 23 is higher than the second support frame 14, the effect of the material collecting tank 2, the stirring tank 1 and the stuffy material tank 3 are arranged in a sequence from top to bottom through the arrangement of the first support frame 23 and the second support frame 14, and the asphalt raw material can automatically flow from the material collecting tank 2 to the stirring tank 1 and then from the stirring tank 1 to the stuffy material tank 3 by utilizing the fluidity of the asphalt.
Preferably, rabbling mechanism 4 comprises agitator motor 41, puddler 42, stirring leaf 43, agitator motor 41 is installed on ejection of compact mechanical seal lid 12, puddler 42 passes feeding mechanical seal lid 11 and ejection of compact mechanical seal lid 12 respectively and is connected with agitator motor 41 transmission, stirring leaf 43 is equipped with a plurality ofly, and is a plurality of stirring leaf 43 sets up inside agitator tank 1 and is connected with puddler 42 transmission, during the use, starts agitator motor 41, drives a plurality of stirring leaves 43 and rotates when agitator motor 41 drives puddler 42 and carries out the rotation, stirs through a plurality of stirring leaves 43 to 1 inside pitch raw materials of agitator tank and modifier.
Preferably, the transmission mechanism 5 is installed on the second support frame 14, the transmission mechanism 5 is composed of a transmission motor 51, a transmission gear 52, a transmission rod 53 and two transmission positioning bearings 54, the transmission rod 53 is installed on the transmission motor 51, the transmission rod 53 is in transmission connection with the transmission motor 51, the transmission gear 52 is fixed on the transmission rod 53, the two transmission positioning bearings 54 are arranged on the transmission rod 53 and located at two sides of the transmission gear 52, the bottom of the transmission positioning bearing 54 is fixed on the second support frame 14, the transmission gear 52 is meshed with the transmission tooth socket 13, when in use, the transmission motor 51 is started, the transmission rod 53 is driven to rotate by the transmission motor 51 and the transmission gear 52 fixed on the transmission rod 53 is driven to synchronously rotate, the stirring tank 1 is rotated by matching the transmission gear 52 with the transmission tooth groove 13, and the position of the transmission rod 53 is fixed by arranging two transmission positioning bearings 54, so that the transmission rod 53 is prevented from being deformed after being stressed to cause equipment damage.
Preferably, the second support frame 14 is provided with a limiting device 7, the limiting device 7 comprises a limiting roller 71, two roller positioning bearings 72 and a limiting rod 73, the limiting roller 71 is installed in the middle of the limiting rod 73, the number of the roller positioning bearings 72 is two, the two roller positioning bearings 72 are installed on the limiting rod 73 and located at two ends of the limiting roller 71, the number of the limiting devices 7 is four, the four limiting devices 7 are installed on the second support frame 14, the periphery of the stirring tank 1 is provided with two contact rings 15, the four limiting devices 7 are in contact with the two contact rings 15, the position of the stirring tank 1 is limited by the four limiting devices 7, so that the stirring tank 1 can rotate on the second support frame 14, and meanwhile, the friction resistance of the stirring tank 1 in the rotating process is reduced by the mutual matching of the limiting roller 71, the roller positioning bearings 72 and the limiting rod 73 on the limiting device 7, improve the working efficiency of the utility model.
Preferably, a first waste gas discharge pipeline 81 is arranged at the top of the material collecting tank 2, a second waste gas discharge pipeline 82 is arranged at the top of the mechanical discharging sealing cover 12, waste gas in the material collecting tank 2 is collected and processed in a centralized manner through the arranged first waste gas discharge pipeline 81, and waste gas in the stirring tank 1 is collected and processed in a centralized manner through the arranged second waste gas discharge pipeline 82.
Preferably, be equipped with a large amount of protruding pieces 16 on agitator tank 1's the inner wall, its effect lies in, goes into agitator tank 1 when inside when asphalt raw materials and modifier, and agitator tank 1 rotates, and asphalt raw materials and modifier constantly bump with protruding piece 16 in agitator tank 1 is inside to promote the abundant reaction of asphalt raw materials and modifier to fuse, increased the utility model discloses a work efficiency.
Preferably, agitator tank 1 is the slope setting, the one end that installs feeding mechanical seal lid 11 in agitator tank 1 is higher than the one end of ejection of compact mechanical seal lid 12, and its effect lies in, and modified asphalt can flow to ejection of compact mechanical seal lid 12 department under the effect of gravity after the stirring is accomplished with the modifier to the asphalt starting material, and rethread discharge pipe 31 makes modified asphalt flow in stuffy material jar 3, the outflow of the modified asphalt of being convenient for, and the sedimentary phenomenon can not appear.
Preferably, the stuffy tank 3 is internally provided with a heating device 32, and when the modified asphalt flows into the stuffy tank 3 for stuffy, the stuffy tank 3 is heated by the heating device 32 to promote the sufficient fusion of the asphalt raw material and the modifier.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a modified asphalt strong shear agitating unit, a serial communication port, including agitator tank (1), collection material jar (2), stifled material jar (3), feeding mechanical seal lid (11), ejection of compact mechanical seal lid (12), rabbling mechanism (4) and drive mechanism (5), the cylinder that agitator tank (1) run through for the middle part, feeding mechanical seal lid (11) and ejection of compact mechanical seal lid (12) are installed respectively to the opening part at agitator tank (1) both ends, make agitator tank (1) inside form a sealed cavity through feeding mechanical seal lid (11) and ejection of compact mechanical seal lid (12), be equipped with round transmission tooth's socket (13) on the outer wall of agitator tank (1), drive mechanism (5) are connected with agitator tank (1) transmission through transmission tooth's socket (13), rabbling mechanism (4) are through feeding mechanical seal lid (11) Ejection of compact mechanical seal lid (12) transversely sets up the inside in agitator tank (1), collection material jar (2) set up by agitator tank (1) and be located the one side that is equipped with feeding mechanical seal lid (11), the bottom of collection material jar (2) is equipped with charge-in pipeline (21), charge-in pipeline (21) pass feeding mechanical seal lid (11) and lead to inside agitator tank (1), the side of collection material jar (2) is equipped with two material ways (22), vexed material jar (3) set up in agitator tank (1) and be located the one side that is equipped with ejection of compact mechanical seal lid (12), the sealed lid of ejection of compact mechanical seal (12) department is equipped with ejection of compact pipeline (31), ejection of compact pipeline (31) intercommunication vexed material jar (3) and agitator tank (1).
2. A modified asphalt strong shear mixing device according to claim 1, wherein a heating outer cover (6) is arranged on the periphery of the mixing tank (1), a ring of heating rods (61) is arranged in the heating outer cover (6), and the heating rods (61) are positioned between the heating outer cover (6) and the mixing tank (1).
3. A modified asphalt strong-shear mixing device according to claim 1, wherein the bottom of the aggregate tank (2) is provided with a first support frame (23), the bottom of the mixing tank (1) is provided with a second support frame (14), and the first support frame (23) is higher than the second support frame (14).
4. The modified asphalt strong-shearing stirring device as claimed in claim 1, wherein the stirring mechanism (4) is composed of a stirring motor (41), a stirring rod (42) and stirring blades (43), the stirring motor (41) is installed on the discharging mechanical sealing cover (12), the stirring rod (42) respectively penetrates through the feeding mechanical sealing cover (11) and the discharging mechanical sealing cover (12) and is in transmission connection with the stirring motor (41), the stirring blades (43) are provided in plurality, and the stirring blades (43) are arranged inside the stirring tank (1) and are in transmission connection with the stirring rod (42).
5. The modified asphalt strong-shear stirring device of claim 3, the transmission mechanism (5) is arranged on the second support frame (14), the transmission mechanism (5) consists of a transmission motor (51), a transmission gear (52), a transmission rod (53) and a transmission positioning bearing (54), the transmission rod (53) is arranged on the transmission motor (51), the transmission rod (53) is in transmission connection with the transmission motor (51), the transmission gear (52) is fixed on the transmission rod (53), two transmission positioning bearings (54) are arranged, the two transmission positioning bearings (54) are arranged on the transmission rod (53) and positioned at two sides of the transmission gear (52), the bottom of the transmission positioning bearing (54) is fixed on the second support frame (14), the transmission gear (52) is meshed with the transmission tooth groove (13).
6. A modified asphalt strong shearing stirring device as defined in claim 3, wherein a limiting device (7) is arranged on the second supporting frame (14), the limiting device (7) comprises a limiting roller (71), roller positioning bearings (72) and a limiting rod (73), the limiting roller (71) is arranged in the middle of the limiting rod (73), the roller positioning bearings (72) are two, the roller positioning bearings (72) are arranged on the limiting rod (73) and located at two ends of the limiting roller (71), the limiting device (7) is four, the limiting device (7) is arranged on the second supporting frame (14), the periphery of the stirring tank (1) is provided with two contact rings (15), and the four limiting devices (7) are in mutual contact with the two contact rings (15).
7. A modified asphalt strong-shear mixing device as defined in claim 1, wherein a first waste gas discharge pipe (81) is arranged on the top of the material collecting tank (2), and a second waste gas discharge pipe (82) is arranged on the top of the discharging mechanical sealing cover (12).
8. A modified asphalt strong shear mixing device according to claim 1, wherein the inner wall of the mixing tank (1) is provided with a plurality of bumps (16).
9. A modified asphalt strong-shear mixing device as defined in claim 1, wherein said mixing tank (1) is inclined, and the end of said mixing tank (1) where said feeding mechanical sealing cover (11) is installed is higher than the end of said discharging mechanical sealing cover (12).
10. A modified asphalt strong-shear mixing device as defined in claim 1, wherein a heating device (32) is arranged inside the stuffy tank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921981550.0U CN211487412U (en) | 2019-11-15 | 2019-11-15 | Modified asphalt strong shearing stirring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921981550.0U CN211487412U (en) | 2019-11-15 | 2019-11-15 | Modified asphalt strong shearing stirring device |
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| CN211487412U true CN211487412U (en) | 2020-09-15 |
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| CN201921981550.0U Active CN211487412U (en) | 2019-11-15 | 2019-11-15 | Modified asphalt strong shearing stirring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351098A (en) * | 2021-07-22 | 2021-09-07 | 左重全 | Deep processing equipment for hydraulic modified asphalt |
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2019
- 2019-11-15 CN CN201921981550.0U patent/CN211487412U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351098A (en) * | 2021-07-22 | 2021-09-07 | 左重全 | Deep processing equipment for hydraulic modified asphalt |
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