CN109898426A - A kind of road and bridge construction road smoothing device - Google Patents

A kind of road and bridge construction road smoothing device Download PDF

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Publication number
CN109898426A
CN109898426A CN201910261059.9A CN201910261059A CN109898426A CN 109898426 A CN109898426 A CN 109898426A CN 201910261059 A CN201910261059 A CN 201910261059A CN 109898426 A CN109898426 A CN 109898426A
Authority
CN
China
Prior art keywords
road
bracket
component
cylinder
driving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910261059.9A
Other languages
Chinese (zh)
Inventor
覃靖
蒋植洁
黄修贤
黄仕明
陆斌
陆贵超
陆桂仁
青志刚
李胜
王啸
王金龙
陈建宇
黄发
黎修旺
李金儒
周琪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGXI CHANGCHANG ROAD & BRIDGE CONSTRUCTION Co Ltd
Original Assignee
GUANGXI CHANGCHANG ROAD & BRIDGE CONSTRUCTION Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGXI CHANGCHANG ROAD & BRIDGE CONSTRUCTION Co Ltd filed Critical GUANGXI CHANGCHANG ROAD & BRIDGE CONSTRUCTION Co Ltd
Priority to CN201910261059.9A priority Critical patent/CN109898426A/en
Publication of CN109898426A publication Critical patent/CN109898426A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a kind of road and bridge construction road smoothing devices, including mobile bracket and the leveling driving wheel, the cleaning agency that are set to below mobile bracket, even mechanism, precompressed mechanism, hold-down mechanism, driven pressing roller and hoofing part component out;The hoofing part component is set to the lower section of mobile bracket by telescoping drive mechanism, when telescoping drive mechanism stretches out, leveling is driven wheel, cleaning agency, evens mechanism, precompressed mechanism, hold-down mechanism and driven pressing roller overhead out and ground disengaging by hoofing part component, and mobile bracket and hoofing part component constitute common trolley;When telescoping drive mechanism bounces back, hoofing part component disengaging ground, mobile bracket and leveling driving wheel, cleaning agency even mechanism, precompressed mechanism, hold-down mechanism and driven pressing roller composition road surface screed units out.Operation of the present invention is simple, without human intervention, high-efficient.

Description

A kind of road and bridge construction road smoothing device
Technical field
The present invention relates to technical field of bridge construction, and in particular to a kind of road and bridge construction road smoothing device.
Background technique
The road traffic condition in China is complicated, may require that construction bridge, in bridge construction process, bridge sometimes when building Face and road surface require to have certain planarization, previous to need largely when concrete is laid on bridge floor or road surface Manpower come road pavement carry out it is smooth, working efficiency is not high, and the use of bridge can be seriously affected when flatness does not reach requirement.
Summary of the invention
It is without human intervention, high-efficient the purpose of the present invention is to provide a kind of road and bridge construction road smoothing device.
In order to solve the above technical problem, the present invention provides following technical solutions: road and bridge construction road smoothing device, packet The leveling for including mobile bracket and being set to below mobile bracket drives wheel, cleaning agency, evens mechanism out, precompressed mechanism, compresses Mechanism, driven pressing roller and hoofing part component;The hoofing part component is set to mobile branch by telescoping drive mechanism The lower section of frame, when telescoping drive mechanism stretches out, leveling is driven wheel, cleaning agency, evens mechanism, precompressed out by hoofing part component Mechanism, hold-down mechanism and driven pressing roller overhead and ground are detached from, and mobile bracket and hoofing part component constitute common trolley;When Telescoping drive mechanism retraction, hoofing part component are detached from ground, mobile bracket and leveling driving wheel, cleaning agency, Leveling machine Structure, precompressed mechanism, hold-down mechanism and driven pressing roller constitute road surface screed units;
The cleaning agency, evens mechanism, precompressed mechanism, hold-down mechanism, driven pressing roller out in the past at leveling driving wheel It is set gradually after;
The hoofing part component includes rectangular frame, two positive transport wheels for being set to rectangular frame front end and sets It is placed in two driven traveling wheels of rectangular frame rear end;
The telescoping drive mechanism includes telescopic cylinder body, damping spring, excessive connecting column;The telescopic cylinder body It is fixedly mounted on the top of mobile bracket, the piston rod of the telescopic cylinder body is across the pilot hole moved in bracket and excessively The top of connecting column is fixedly connected, and the bottom end of the excessive connecting column is connect by damping spring with rectangular frame;Described Buffer spring is additionally provided between mobile bracket and the rectangular frame;The buffer spring is set in damping spring, mistake Spend the outside of connecting column and cylinder piston rod.
Further, the cleaning agency includes the hollow tube closed at both ends being set on mobile bracket, described The both ends of hollow tube be welded on mobile bracket by connecting rod;Several circles are equidistantly provided on the hollow tube Hole;Horn-like air-exhausting duct is installed at the circular hole;Air inlet is arranged in the both ends of the hollow tube;The air inlet It is connect by air hose with air-introduced machine.
Further, the mechanism of evening out includes the linear drives component that scraper plate and driving scraper plate move back and forth;It is described Inclination setting, tilt angle be 60-75 °;The linear drives component includes traversing plate;The scraper plate is fixed It is mounted on the traversing plate, the nut seat with threaded hole is provided on the traversing plate, is set on the nut seat Set positioning plate;Locating slot is provided on the mobile bracket;The positioning plate is slidably connected on locating slot;The spiral shell Base is spirally connected with lead screw, and the lead screw is installed on mobile bracket by bearing and bearing block;The lead screw is by evening electricity out Machine driving.
Further, at least one vibration unit is arranged in the precompressed mechanism, and the vibration unit can mutually solely Vertical driving;The vibration unit includes vibrating compacting plate, pushes sheet frame, bolster, guiding trestle, lower air cylinder;It is described Lower air cylinder connect with the pushing sheet frame and the pushing sheet frame driven to move up and down along the guiding trestle, institute Guide groove is provided on the guiding trestle stated, the pushing sheet frame is inverted U framework, is provided with vibration in the pushing sheet frame Dynamic pressure solid plate, the vibrating compacting plate are mounted on by bolster and are pushed in sheet frame.
Further, the vibration unit is mounted on transversely-moving rack, and the transversely-moving rack is driven by traversing driving assembly Transverse shifting.
Further, the traversing driving assembly includes the first driving cylinder and for being symmetrically disposed on transversely-moving rack two sides Two driving cylinders;The cylinder body of the first driving cylinder and the second driving cylinder is fixed on the fixation bracket below mobile bracket On, the piston rod of the first driving cylinder and the second driving cylinder is fixedly mounted on the two sides of transversely-moving rack by connector, and first Cylinder is driven to stretch out, then the second driving cylinder retraction, the first driving cylinder retraction, then the second driving cylinder stretches out.
Further, the hold-down mechanism is roller structure.
Further, the driven pressing roller includes roll shaft, roll body, fastening guide groove, fastening guide wheel, mounting bracket;Institute The two sides for the mobile frame bottom stated are symmetrically arranged with mounting bracket;It is provided in the mounting bracket and the matched axis of roll shaft Hole;The roll shaft is rotatablely connected by axis hole and mounting bracket;The roll body is set on the roll shaft, the roller Axis is provided with fastening guide wheel in the two sides of roll body, is provided with fastening guide groove above the fastening guide wheel, the fastening is led It takes turns and is rolled in the groove body of fastening guide groove, the fastening guide groove is fixedly connected in mounting bracket.
The beneficial effects obtained by the present invention are as follows being: the present invention is stretched out hoofing part mechanism by telescoping drive mechanism, is moved What dynamic bracket can be convenient is moved to the position of setting, and then telescoping drive mechanism withdraws hoofing part mechanism, passes through leveling Wheel is driven to drive mobile bracket mobile, while mobile, cleaning agency is purged the road surface in front of mobile bracket by blowing Completely, it evens mechanism reciprocating motion out, then road surface evening out tentatively is flattened concrete evened out etc. by hold-down mechanism, Hold-down mechanism and driven pressing roller further compress compacting road surface, and operation of the present invention is simple, without human intervention, high-efficient.
Detailed description of the invention
It, below will be to needed in the embodiment in order to more clearly illustrate the technical solution in the embodiment of the present invention Attached drawing is simply introduced, it should be apparent that, the accompanying drawings in the following description is only some embodiments recorded in the present invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing.
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the enlarged drawing of A in Fig. 1.
Fig. 3 is the structural schematic diagram of cleaning agency.
Fig. 4 is the structural schematic diagram for evening mechanism out.
Fig. 5 is the structural schematic diagram of driven pressing roller.
Fig. 6 is the structural schematic diagram of precompressed mechanism.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description.
As shown in figures 1 to 6, it is road and bridge construction road smoothing device of the invention, including moves bracket 1 and be set to shifting Leveling driving wheel 2, the cleaning agency 3 of dynamic 1 lower section of bracket even mechanism 4, precompressed mechanism 5, hold-down mechanism 6, driven pressing roller out 7 and hoofing part component 8;The hoofing part component 8 is set to the lower section of mobile bracket 1 by telescoping drive mechanism, when Telescoping drive mechanism stretch out, hoofing part component 8 will leveling driving wheel 2, cleaning agency 3, even out mechanism 4, precompressed mechanism 5, Hold-down mechanism 6 and 7 overhead of driven pressing roller and ground are detached from, and mobile bracket 1 and hoofing part component 8 constitute common trolley;When Telescoping drive mechanism retraction, hoofing part component 8 are detached from ground, mobile bracket 1 and leveling driving wheel 2, cleaning agency 3, shovel Flattening mechanism 4, precompressed mechanism 5, hold-down mechanism 6 and driven pressing roller 7 constitute road surface screed units;
The cleaning agency 3, evens mechanism 4, precompressed mechanism 5, hold-down mechanism 6, driven compression out at leveling driving wheel 2 Roller 7 is set gradually from front to back;
The hoofing part component 8 includes rectangular frame 81, two actively walkings for being set to 81 front end of rectangular frame Take turns and be set to two driven traveling wheels of 81 rear end of rectangular frame;
The telescoping drive mechanism includes telescopic cylinder body 91, damping spring 92, excessive connecting column 93;Described is flexible Cylinder block 91 is fixedly mounted on the top of mobile bracket 1, and the piston rod of the telescopic cylinder body 91 passes through in mobile bracket 1 Pilot hole is fixedly connected with the top of excessive connecting column 93, and the bottom end of the excessive connecting column 93 passes through damping spring 92 and square Shape frame 81 connects;Buffer spring 94 is additionally provided between the mobile bracket 1 and the rectangular frame 81;Described is slow Rush the outside that spring 94 is set in damping spring 92, excessive connecting column 93 and cylinder piston rod.
Cleaning agency 3 of the invention includes the hollow tube 31 closed at both ends that is set on mobile bracket 1, it is described in The both ends of blank pipe body 31 are welded on mobile bracket 1 by connecting rod 32;If being equidistantly provided on the hollow tube 31 Dry circular hole 33;Horn-like air-exhausting duct 34 is installed at the circular hole 33;Air inlet is arranged in the both ends of the hollow tube 31 35;The air inlet 35 is connect by air hose with air-introduced machine.
Even the linear drives component that mechanism 4 includes scraper plate 41 and scraper plate 41 is driven to move back and forth out;The scraper plate 41 inclines Tiltedly setting, tilt angle are 60-75 °;The linear drives component includes traversing plate 42;The scraper plate 41 is fixedly mounted On the traversing plate 42, the nut seat 43 with threaded hole, the nut seat 43 are provided on the traversing plate 42 Upper setting positioning plate 44;Locating slot 45 is provided on the mobile bracket 1;The positioning plate 44 is slidably connected at locating slot On 45;The nut seat 43 is spirally connected with lead screw 46, and the lead screw 46 is installed on mobile bracket 1 by bearing and bearing block On;The lead screw 46 is driven by evening motor 47 out.
At least one vibration unit 51 is arranged in precompressed mechanism 5 of the invention, and the vibration unit 51 can be mutually indepedent Driving;The vibration unit 51 include vibrating compacting plate 511, push sheet frame 512, bolster 513, guiding trestle 514, under Air cylinder 515;The lower air cylinder 515 connect with the pushing sheet frame 512 and drives the pushing sheet frame 512 along institute The guiding trestle 514 stated moves up and down, and guide groove is provided on the guiding trestle 514, and the pushing sheet frame 512 is to fall U-shaped frame body is provided with vibrating compacting plate 511 in the pushing sheet frame 512, and the vibrating compacting plate 511 passes through bolster 513 are mounted in pushing sheet frame 512.
Vibration unit 51 of the invention is mounted on transversely-moving rack 10, and the transversely-moving rack 10 is driven horizontal by traversing driving assembly To movement.
Traversing driving assembly of the invention includes the first driving cylinder 111 and second for being symmetrically disposed on 10 two sides of transversely-moving rack Drive cylinder 112;The cylinder body of the first driving cylinder 111 and the second driving cylinder 112 is fixed on mobile 1 lower section of bracket On fixed bracket, the piston rod of the first driving cylinder 111 and the second driving cylinder 112 is fixedly mounted on traversing by connector The two sides of frame 10, the first driving cylinder 111 stretch out, then the second driving cylinder 112 bounces back, and the first driving cylinder 111 bounces back, then and the Two driving cylinders 112 stretch out.
Hold-down mechanism 6 of the invention is roller structure.
Driven pressing roller 7 of the invention includes roll shaft 71, roll body 72, fastening guide groove 73, fastening guide wheel 74, mounting bracket 75;The two sides of 1 bottom of mobile bracket are symmetrically arranged with mounting bracket 75;It is provided in the mounting bracket 75 and roller The matched axis hole of axis 71;The roll shaft 71 is rotatablely connected by axis hole and mounting bracket 75;The roll body 72 is set in institute On the roll shaft 71 stated, the roll shaft 71 is provided with fastening guide wheel 74 in the two sides of roll body 72, and described fastens the upper of guide wheel 74 Side is provided with fastening guide groove 73, and the fastening guide wheel 74 rolls in the groove body of fastening guide groove 73, the fastening guide groove 73 It is fixedly connected in mounting bracket 75.
The working principle of the invention: when the invention works, first being stretched out hoofing part mechanism by telescoping drive mechanism, The position for being moved to setting that mobile bracket can be convenient, then telescoping drive mechanism withdraws hoofing part mechanism, by whole Flat driving wheel drives mobile bracket mobile, and while mobile, cleaning agency is blown the road surface in front of mobile bracket by drying It sweeps completely, evens mechanism reciprocating motion out, it is then by hold-down mechanism that the concrete evened out is isobaric by road surface evening out tentatively Flat, hold-down mechanism and driven pressing roller further compress compacting road surface, so that road surface be flattened.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to design of the invention It is defined with range, without departing from the design concept of the invention, ordinary engineering and technical personnel is to this hair in this field The all variations and modifications that bright technical solution is made should all fall into protection scope of the present invention, claimed skill of the invention Art content is all documented in technical requirements book.

Claims (8)

1. a kind of road and bridge construction road smoothing device, it is characterised in that: including mobile bracket (1) and be set to mobile bracket (1) leveling driving wheel (2), cleaning agency (3) below even mechanism (4) out, are precompressed mechanism (5), hold-down mechanism (6), driven Pressing roller (7) and hoofing part component (8);The hoofing part component (8) is set to mobile branch by telescoping drive mechanism The lower section of frame (1), when telescoping drive mechanism stretch out, hoofing part component (8) will leveling driving wheel (2), cleaning agency (3), It evens mechanism (4), precompressed mechanism (5), hold-down mechanism (6) and driven pressing roller (7) overhead out and ground is detached from, mobile bracket (1) Common trolley is constituted with hoofing part component (8);When telescoping drive mechanism bounces back, hoofing part component (8) is detached from ground, mobile Bracket (1) and leveling driving wheel (2), cleaning agency (3), even out mechanism (4), precompressed mechanism (5), hold-down mechanism (6) and from Dynamic pressing roller (7) constitute road surface screed units;
The cleaning agency (3), leveling driving wheel (2), even out mechanism (4), precompressed mechanism (5), hold-down mechanism (6), from Dynamic pressing roller (7) are set gradually from front to back;
The hoofing part component (8) includes rectangular frame (81), two active rows for being set to rectangular frame (81) front end The two driven traveling wheels walked wheel and be set to rectangular frame (81) rear end;
The telescoping drive mechanism includes telescopic cylinder body (91), damping spring (92), excessive connecting column (93);Described stretches Contracting cylinder block (91) is fixedly mounted on the top of mobile bracket (1), and the piston rod of the telescopic cylinder body (91) passes through movement Pilot hole in bracket (1) is fixedly connected with the top of excessive connecting column (93), and the bottom end of the excessive connecting column (93) is logical Damping spring (92) is crossed to connect with rectangular frame (81);Between the mobile bracket (1) and the rectangular frame (81) also It is provided with buffer spring (94);The buffer spring (94) is set in damping spring (92), excessive connecting column (93) and cylinder The outside of piston rod.
2. a kind of road and bridge construction road smoothing device according to claim 1, it is characterised in that: the cleaning agency It (3) include the hollow tube (31) closed at both ends being set on mobile bracket (1), the both ends of the hollow tube (31) are logical Connecting rod (32) is crossed to be welded on mobile bracket (1);Several circular holes (33) are equidistantly provided on the hollow tube (31); Horn-like air-exhausting duct (34) are installed at the circular hole (33);Air inlet is arranged in the both ends of the hollow tube (31) (35);The air inlet (35) is connect by air hose with air-introduced machine.
3. a kind of road and bridge construction road smoothing device according to claim 1, it is characterised in that: described evens mechanism out It (4) include scraper plate (41) and the linear drives component that driving scraper plate (41) moves back and forth;The scraper plate (41) is obliquely installed, Tilt angle is 60-75 °;The linear drives component includes traversing plate (42);The scraper plate (41) is fixedly mounted on institute On the traversing plate (42) stated, the nut seat (43) with threaded hole, the nut seat are provided on the traversing plate (42) (43) positioning plate (44) are set on;Locating slot (45) are provided on the mobile bracket (1);Positioning plate (44) sliding It is connected on locating slot (45);The nut seat (43) is spirally connected with lead screw (46), and the lead screw (46) passes through bearing and axis Seat is held to be installed on mobile bracket (1);The lead screw (46) is by evening motor (47) driving out.
4. a kind of road and bridge construction road smoothing device according to claim 1, it is characterised in that: the precompressed mechanism (5) at least one vibration unit (51) is set, and the vibration unit (51) mutually independent can drive;The vibration list First (51) include vibrating compacting plate (511), push sheet frame (512), bolster (513), guiding trestle (514), lower air cylinder (515);The lower air cylinder (515) connect with the pushing sheet frame (512) and drives described pushing sheet frame (512) edge The guiding trestle (514) moves up and down, and guide groove, the pushing sheet frame are provided on the guiding trestle (514) (512) it is inverted U framework, is provided with vibrating compacting plate (511) in the pushing sheet frame (512), the vibrating compacting plate (511) it is mounted on and is pushed in sheet frame (512) by bolster (513).
5. a kind of road and bridge construction road smoothing device according to claim 4, it is characterised in that: the vibration unit (51) it is mounted on transversely-moving rack (10), the transversely-moving rack (10) drives transverse shifting by traversing driving assembly.
6. a kind of road and bridge construction road smoothing device according to claim 5, it is characterised in that: the traversing driving Component includes the first driving cylinder (111) and the second driving cylinder (112) for being symmetrically disposed on transversely-moving rack (10) two sides;Described The cylinder body of first driving cylinder (111) and the second driving cylinder (112) is fixed on the fixation bracket below mobile bracket (1), The piston rod of first driving cylinder (111) and the second driving cylinder (112) is fixedly mounted on transversely-moving rack (10) by connector Two sides, first driving cylinder (111) stretch out, then second driving cylinder (112) retraction, first driving cylinder (111) retraction, then Second driving cylinder (112) is stretched out.
7. a kind of road and bridge construction road smoothing device according to claim 1, it is characterised in that: the hold-down mechanism It (6) is roller structure.
8. a kind of road and bridge construction road smoothing device according to claim 1, it is characterised in that: the driven compression Roller (7) includes roll shaft (71), roll body (72), fastening guide groove (73), fastening guide wheel (74), mounting bracket (75);The movement The two sides of bracket (1) bottom are symmetrically arranged with mounting bracket (75);It is provided in the mounting bracket (75) and roll shaft (71) Matched axis hole;The roll shaft (71) is rotatablely connected by axis hole and mounting bracket (75);The roll body (72) is set in On the roll shaft (71), the roll shaft (71) is provided with fastening guide wheel (74), the fastening in the two sides of roll body (72) Fastening guide groove (73), the fastening guide wheel (74) rolling in the groove body of fastening guide groove (73) are provided with above guide wheel (74) Dynamic, the fastening guide groove (73) is fixedly connected on mounting bracket (75).
CN201910261059.9A 2019-04-02 2019-04-02 A kind of road and bridge construction road smoothing device Pending CN109898426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910261059.9A CN109898426A (en) 2019-04-02 2019-04-02 A kind of road and bridge construction road smoothing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910261059.9A CN109898426A (en) 2019-04-02 2019-04-02 A kind of road and bridge construction road smoothing device

Publications (1)

Publication Number Publication Date
CN109898426A true CN109898426A (en) 2019-06-18

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137407A1 (en) * 2001-07-31 2003-02-20 Duevelsdorf Handelsgmbh Drum-shaped roller as used in agriculture or road works, comprising separate towing units for transport and use
CN201924259U (en) * 2010-12-17 2011-08-10 徐工集团工程机械股份有限公司科技分公司 Road roller
CN203807918U (en) * 2014-04-18 2014-09-03 中工国际工程股份有限公司 Compacting and flattening device
US9476169B1 (en) * 2012-08-14 2016-10-25 Ronald A. Knapp Concrete finishing machine
CN106193558A (en) * 2016-08-09 2016-12-07 郭颂怡 Concrete screed
CN206655067U (en) * 2017-02-27 2017-11-21 中铁机械装备研究设计院(成都)有限公司 One kind is vibrated and integer construction equipment for the straight shop fixtures seat of subway
CN207295386U (en) * 2017-08-25 2018-05-01 何方华 A kind of municipal road construction concrete jolt ramming and paving device
CN207525583U (en) * 2017-11-17 2018-06-22 史海飞 A kind of civic building asphalt paving device
CN208559403U (en) * 2018-06-25 2019-03-01 山东职业学院 A kind of all-around mobile trolley

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137407A1 (en) * 2001-07-31 2003-02-20 Duevelsdorf Handelsgmbh Drum-shaped roller as used in agriculture or road works, comprising separate towing units for transport and use
CN201924259U (en) * 2010-12-17 2011-08-10 徐工集团工程机械股份有限公司科技分公司 Road roller
US9476169B1 (en) * 2012-08-14 2016-10-25 Ronald A. Knapp Concrete finishing machine
CN203807918U (en) * 2014-04-18 2014-09-03 中工国际工程股份有限公司 Compacting and flattening device
CN106193558A (en) * 2016-08-09 2016-12-07 郭颂怡 Concrete screed
CN206655067U (en) * 2017-02-27 2017-11-21 中铁机械装备研究设计院(成都)有限公司 One kind is vibrated and integer construction equipment for the straight shop fixtures seat of subway
CN207295386U (en) * 2017-08-25 2018-05-01 何方华 A kind of municipal road construction concrete jolt ramming and paving device
CN207525583U (en) * 2017-11-17 2018-06-22 史海飞 A kind of civic building asphalt paving device
CN208559403U (en) * 2018-06-25 2019-03-01 山东职业学院 A kind of all-around mobile trolley

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