CN111676778A - Narrow deep trench leveling device - Google Patents
Narrow deep trench leveling device Download PDFInfo
- Publication number
- CN111676778A CN111676778A CN202010593957.7A CN202010593957A CN111676778A CN 111676778 A CN111676778 A CN 111676778A CN 202010593957 A CN202010593957 A CN 202010593957A CN 111676778 A CN111676778 A CN 111676778A
- Authority
- CN
- China
- Prior art keywords
- piston
- piston cylinder
- cylinder
- bevel gear
- fixed
- 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.)
- Withdrawn
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
- E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
- E01C19/38—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight with means specifically for generating vibrations, e.g. vibrating plate compactors, immersion vibrators
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Soil Working Implements (AREA)
Abstract
The invention relates to a narrow deep trench leveling device, which effectively solves the problems of high labor intensity of workers, unsatisfactory leveling and compacting effects and long consumed time in the conventional roadside trench leveling and compacting operation; the technical scheme of its solution includes a dolly, be equipped with a support frame on the dolly, the left and right sides of support frame respectively is equipped with a riser, be equipped with a clamp plate of arranging the automobile body below in between two risers, be fixed with a pivot through motor drive on the dolly, be fixed with an incomplete bevel gear in the pivot, be fixed with the first bevel gear with incomplete bevel gear meshing in the dolly runner drive shaft, the in-process dolly that the pivot rotated a week is fixed two risers earlier and is moved backward extrusion irrigation canals and ditches lateral wall, drive clamp plate contact again and compress tightly irrigation canals and ditches bottom surface, the pivot is advanced forward through incomplete bevel gear meshing first bevel gear drive dolly behind the riser reverse separation irrigation canals and ditches lateral.
Description
Technical Field
The invention relates to the field of road construction, in particular to a leveling device for a narrow deep trench.
Background
The road need dig out escape canal and roadside stone ditch in the work progress both sides on the way, escape canal and roadside stone ditch are the ditch that the width is little but the degree of depth is big, the ditch of this type still need carry out the laying of concrete after digging the completion, need carry out flattening and compaction to irrigation canals and ditches side and bottom in laying earlier stage, because the little degree of depth of irrigation canals and ditches width of this type is big, traditional flattening compaction equipment is bulky can not the operation in this kind of irrigation canals and ditches, consequently, manual flattening and compaction are still adopted to this kind of irrigation canals and ditches of stage this kind, flattening compaction effect is poor, it is long consuming time, workman intensity of labour is big.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the invention provides a narrow deep trench leveling device, which effectively solves the problems of high labor intensity of workers, unsatisfactory leveling and compacting effects and long consumed time in the conventional roadside trench leveling and compacting operation.
The technical scheme for solving the problems comprises a trolley, wherein a support frame is arranged on the trolley, the left side and the right side of the support frame are respectively provided with a vertical plate, a pressing plate arranged below a trolley body is arranged between the two vertical plates, the middle position of the support frame is provided with two first piston cylinders which are arranged side by side in a front-back spaced mode and are provided with openings at the left end and the right end, a second piston cylinder capable of intermittently supplying air to the first piston cylinders is arranged above each first piston cylinder, two ends of each first piston cylinder are respectively provided with a first piston rod with an inward resetting trend, the free end of each first piston rod is fixed on the vertical plate at the corresponding side, a third piston cylinder with a downward opening is arranged below each first piston cylinder, a third piston rod with an upward resetting trend is arranged in each third piston cylinder, the free end of the third piston rod is fixedly connected with the pressing plate, the cylinder walls at the left side and, the other end of the air pipe is communicated with the bottom of the third piston cylinder, a Z-shaped channel is arranged on the part, arranged in the first piston cylinder, of each first piston rod, when the second piston supplies air to the first piston, the two first piston rods move outwards to drive the vertical plates to move outwards, and the air pipe and the pressing plate communicated with the inside of the third piston are moved downwards, when the second piston pumps air from the first piston, the two first piston rods move inwards, the two vertical plates move inwards to realize the communication of the air pipe and the outside through the Z-shaped through grooves, the third piston rod resets to drive the pressing plate to move upwards, the trolley stops when the second piston cylinder supplies air to the first piston cylinder, and the trolley advances when the second piston cylinder pumps air to the first piston cylinder.
The invention has novel conception, ingenious structure and strong practicability, and effectively solves the problems of high labor intensity of workers, unsatisfactory leveling and compacting effects and long consumed time in the existing roadside ditch leveling and compacting operation.
Drawings
Fig. 1 is a front sectional view of the present invention when walking.
FIG. 2 is a front sectional view of the present invention when flattened.
FIG. 3 is a top view of the present invention.
FIG. 4 is a left side sectional view of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As can be seen from the figures 1 to 4, the trolley comprises a trolley 1, a support frame 2 is arranged on the trolley 1, a vertical plate 3 is respectively arranged at the left side and the right side of the support frame 2, a pressing plate 4 arranged below a trolley body is arranged between the two vertical plates 3, two first piston cylinders 5 which are arranged side by side in a spaced manner are arranged in the middle of the support frame, the left end and the right end of each first piston cylinder are both open, a second piston cylinder 6 which can intermittently supply air to the first piston cylinders 5 is arranged above the first piston cylinders 5, a first piston rod 7 with an inward resetting trend is respectively arranged at the two ends of each first piston cylinder 5, the free end of each first piston rod 7 is fixed on the vertical plate 3 at the corresponding side, a third piston cylinder 8 with a downward opening is arranged below each first piston cylinder 5, a third piston rod 9 with an upward resetting trend is arranged in each third piston cylinder 8, and the free end of each third piston, the cylinder walls of the left side and the right side of the first piston cylinder 5 are respectively provided with an air pipe 10 communicated with the inside of the first piston cylinder, the other end of the air pipe 10 is communicated with the bottom of the third piston cylinder 8, a Z-shaped channel 11 is arranged at the part, arranged in the first piston cylinder 5, of each first piston rod 7, when the second piston supplies air to the first piston, the two first piston rods 7 move outwards to drive the vertical plates 3 to move outwards, downward movement of the air pipes 10 and the pressing plates 4 communicated with the inside of the third piston is achieved, when the second piston pumps air from the first piston, the two first piston rods 7 move inwards, the two vertical plates 3 move inwards to achieve communication of the air pipes 10 with the outside through the Z-shaped through grooves, the third piston rods 9 reset to drive the pressing plates 4 to move upwards, when the second piston cylinder 6 supplies air to the first piston cylinder 5, the trolley 1 stops, and when the second piston cylinder 6 pumps air.
In order to realize that the second piston cylinders 6 can intermittently supply gas to the first piston cylinders 5, a piston driven by a second piston rod 12 is arranged in each second piston cylinder 6, a rotary table 13 which is rotatably connected to the support frame 2 is arranged above the second piston rod 12, a connecting rod 14 is eccentrically hinged on the rotary table 13, the free end of the connecting rod 14 is hinged with the second piston rod 12, and the rotary table 13, the connecting rod 14 and the second piston rods 12 form a crank rocker mechanism.
In order to realize that the trolley 1 stops when the second piston cylinder 6 supplies air to the first piston cylinder 5, the trolley 1 advances when the second piston cylinder 6 exhausts air to the first piston cylinder 5, a rotating shaft 15 driven by a motor is rotatably arranged on the trolley 1, the motor is connected with the rotating shaft 15 through a first gear transmission set, a first bevel gear 16 is arranged on a wheel transmission shaft of the trolley 1, an incomplete bevel gear 17 is meshed on the first bevel gear 16, the incomplete bevel gear 17 is connected with the rotating shaft 15 through a second gear transmission set, the two rotating wheels are connected through a fixed shaft, the fixed shaft is sleeved with a first chain wheel 18, a second chain wheel 19 identical to the first chain wheel 18 is sleeved on the rotating shaft 15, and the first chain wheel 18 is connected with the second chain wheel 19 through a chain.
In order to realize that two first piston rods 7 can reset to the interior of first piston cylinder 5, be fixed with the sleeve 20 of suit on first piston rod 7 on support frame 2, riser 3 and correspond and be equipped with a first extension spring 21 of suit on first piston rod 7 between the sleeve 20, the one end of first extension spring 21 is fixed on riser 3, and the other end is fixed on sleeve 20.
In order to realize that the third piston rod 9 can reset upwards, a second tension spring 22 is sleeved on the third piston rod 9, one end of the second tension spring 22 is fixed on the pressing plate 4, and the other end of the second tension spring is fixed on the cylinder body of the third piston cylinder 8.
In order to compensate the air suction quantity of the second piston cylinder 6, a through pipe is arranged on the side wall of the lower end of the second piston cylinder 6, and a check valve 23 which can only unidirectionally admit air from the outside into the second piston cylinder 6 is arranged on the through pipe.
In order to realize that one end of the Z-shaped channel 11 can be communicated with the air pipe 10 and the other end is communicated with the outside when the two first pistons are reset towards the middle, the air pipe 10 is communicated with the first piston cylinder 5 from the lower part of the outer circular surface of the first piston cylinder 5, and the upper part of the outer circular surface of the first piston cylinder 5 is provided with a through hole which can be communicated with the upper end of the Z-shaped channel 11.
The specific working process of the invention is as follows: when the device is used, a vehicle body is placed in a ditch so that a vertical plate 3 and a pressing plate 4 are not contacted with the bottom surface and the side surface of the ditch at first, at the moment, a connecting rod 14 on a rotating disk 13 is hinged at the uppermost position of the rotating disk 13, an incomplete bevel gear 17 and a first bevel gear 16 are in a meshed state, after the meshing is completed, a driving switch of a motor is turned on to realize that the motor drives a rotating shaft 15 to rotate through a first gear set, at the moment, the incomplete bevel gear 17 is meshed with the first bevel gear 16, so that the rotating shaft 15 drives a trolley 1 to move forwards for a certain distance through the incomplete bevel gear 17 and the first bevel gear 16 until a non-toothed part on the incomplete bevel gear 17 corresponds to the first bevel gear 16, at the moment, the trolley 1 stops moving, two rotating disks 13 are driven to rotate through a first chain wheel 18 and a second chain wheel 19 along with the rotation, the crank rocker mechanism drives the second piston rod 12 to move downwards and the piston and enables gas in the second piston cylinder 6 to be extruded and enter the first piston cylinder 5 in the moving process, the first piston cylinder 5 is inflated, the two first piston rods 7 move outwards under the action of air pressure, the air pipe 10 on the third piston cylinder 8 is communicated with the outside through the Z-shaped channel 11 in the initial state, the vertical plate 3 moves outwards along with the first piston rods 7 along with the outwards movement of the first piston rods 7, the first tension spring 21 is stretched and enables the first tension spring to have the rebounding trend and the elastic potential energy in the process, meanwhile, the lower end opening of the Z-shaped channel 11 is staggered with the air pipe 10 along with the outwards movement of the first piston rods 7, the vertical plate 3 continuously moves towards two sides and extrudes the side wall of the ditch in the process, when the first piston rods 7 move to the end part which is arranged outside the air pipe 10, the air pipe 10 is communicated with the third piston cylinder, the third piston supplies air to realize that the third piston rod 9 drives the pressing plate 4 to extrude downwards, and in the process, the second tension spring 22 is stretched and has a rebound tendency and elastic potential energy, so that the pressing plate 4 gradually contacts the bottom of the ditch, extrudes and hammers the bottom of the ditch.
Along with the rotation of the crank rocker, the second piston rod 12 finishes downward extrusion and starts upward movement reset, in the process, the second piston cylinder 6 starts to suck air from the first piston cylinder 5, the two first piston rods 7 reset towards the middle under the action of the first tension spring 21, the end part of the air pipe 10 communicated with the first piston cylinder 5 is firstly plugged in the reset process, at the moment, the two vertical plates 3 reset towards the middle firstly, the reset process enables the end part of the air pipe 10 communicated with the first piston cylinder 5 to be communicated with the lower end part of the Z-shaped channel 11, the air in the third piston cylinder 8 is discharged to the outside through the Z-shaped channel 11, the upward reset of the pressure plate 4 is realized under the reset action of the second tension spring 22, at the moment, along with the continuous air suction of the second piston cylinder 6, the air in the first piston cylinder 5 is not enough to realize the reset of the crank rocker mechanism, the required additional air is supplied to the second piston, so that the second piston cylinder 6 can complete the reciprocating motion, when the pressure plate 4 is separated from the ground, the lower trolley 1 moves forwards again when the toothed part of the incomplete bevel gear 17 is meshed with the first bevel gear 16 again.
Compared with the traditional equipment, the device has the following advantages:
1. this device realizes through 6 intermittent type of second piston cylinder air supplies to first piston cylinder 5 in the air feed realize that first piston rod 7 drives riser 3 to the both sides motion, supply air again and give third piston cylinder 8 after riser 3 compresses tightly the irrigation canals and ditches lateral wall simultaneously, drive 4 extrudees downwards and carry out the compaction to the irrigation canals and ditches bottom through third piston rod 9, realize that second piston air supply cycle can drive two risers 3 and can also drive 4 extrudees downwards when outwards extrudeing, thereby realize the synchronous flattening to irrigation canals and ditches bottom and lateral wall.
2. Consequently, move through first piston rod 7 and compress tightly the intercommunication position of lateral wall after 3 risers of riser in the realization opening trachea 10 and first piston cylinder 5, realize earlier the extrusion lateral wall and carrying out the compressing tightly of irrigation canals and ditches bottom, this precedence satisfies effectively to have solved because the irrigation canals and ditches width is little degree of depth big, traditional leveling device quality is light, when vibrations compaction irrigation canals and ditches bottom, the device appears jumping easily, and through pressing from both sides tight irrigation canals and ditches lateral wall with riser 3 earlier, make the device monolithic stationary, then carry out the bottom vibration at ordinary times then can not appear the device beat and the not good problem of leveling effect that leads to, still satisfy the effect that irrigation canals and ditches bottom.
3. Through same drive arrangement drive leveling device and running gear, effectively save space to reduce this device volume, make this device accord with the construction requirement more, have the motion precedence order between drive arrangement and the leveling device simultaneously, dolly 1 can not remove during the vibrations compaction, riser 3 and clamp plate 4 do not contact with the irrigation canals and ditches when dolly 1 removes, two kinds of motions are mutually supported, the effectual automation of realizing the irrigation canals and ditches flattening, workman intensity of labour has been reduced, leveling efficiency has been improved.
The invention has novel conception, ingenious structure and strong practicability, and effectively solves the problems of high labor intensity of workers, unsatisfactory leveling and compacting effects and long consumed time in the existing roadside ditch leveling and compacting operation.
Claims (7)
1. A narrow deep trench leveling device comprises a trolley (1), wherein a support frame (2) is arranged on the trolley (1), and the narrow deep trench leveling device is characterized in that the left side and the right side of the support frame (2) are respectively provided with a vertical plate (3), a pressing plate (4) arranged below a trolley body is arranged between the two vertical plates (3), two first piston cylinders (5) which are arranged in a front-back side-by-side spaced manner and are provided with openings at the left end and the right end are arranged in the middle of the support frame, a second piston cylinder (6) capable of intermittently supplying air to the first piston cylinders (5) is arranged above the first piston cylinders (5), two ends of each first piston cylinder (5) are respectively provided with a first piston rod (7) with an inward resetting trend, the free end of each first piston rod (7) is fixed on the vertical plate (3) at the corresponding side, a third piston cylinder (8) with a downward opening is, a third piston rod (9) with upward resetting trend is installed in the third piston cylinder (8), the free end of the third piston rod (9) is fixedly connected with the pressing plate (4), the cylinder walls on the left side and the right side of the first piston cylinder (5) are respectively provided with an air pipe (10) communicated with the interior of the first piston cylinder, the other end of the air pipe (10) is communicated with the bottom of the third piston cylinder (8), a Z-shaped channel (11) is arranged at the part of each first piston rod (7) arranged in the first piston cylinder (5), when the second piston supplies air to the first piston, the two first piston rods (7) move outwards to drive the vertical plates (3) to move outwards, the air pipes (10) and the interior of the third piston to be communicated with the pressing plate (4) to move downwards, when the second piston sucks air from the first piston, the two first piston rods (7) move inwards, the two vertical plates (3) move inwards to realize the communication of the air pipes (10) with the outside through the Z-shaped, the third piston rod (9) resets and drives the pressing plate (4) to move upwards, the trolley (1) stops when the second piston cylinder (6) supplies air to the first piston cylinder (5), and the trolley (1) advances when the second piston cylinder (6) exhausts air to the first piston cylinder (5).
2. The narrow deep trench leveling device according to claim 1, wherein a piston driven by a second piston rod (12) is arranged in each second piston cylinder (6), a rotary table (13) rotatably connected to the support frame (2) is arranged above the second piston rod (12), a connecting rod (14) is eccentrically hinged to the rotary table (13), the free end of the connecting rod (14) is hinged to the second piston rod (12), and the rotary table (13), the connecting rod (14) and the second piston rod (12) form a crank-rocker mechanism.
3. The narrow deep trench leveling device according to claim 1, wherein a rotating shaft (15) driven by a motor is rotatably mounted on the trolley (1), the motor is connected with the rotating shaft (15) through a first gear transmission set, a first bevel gear (16) is arranged on a wheel transmission shaft of the trolley (1), an incomplete bevel gear (17) is meshed on the first bevel gear (16), the incomplete bevel gear (17) is connected with the rotating shaft (15) through a second gear transmission set, the two rotating wheels are connected through a fixed shaft, a first chain wheel (18) is sleeved on the fixed shaft, a second chain wheel (19) identical to the first chain wheel (18) is sleeved on the rotating shaft (15), and the first chain wheel (18) is connected with the second chain wheel (19) through a chain.
4. The narrow deep trench leveling device as claimed in claim 1, wherein a sleeve (20) sleeved on the first piston rod (7) is fixed on the support frame (2), a first tension spring (21) sleeved on the first piston rod (7) is arranged between the vertical plate (3) and the corresponding sleeve (20), one end of the first tension spring (21) is fixed on the vertical plate (3), and the other end of the first tension spring is fixed on the sleeve (20).
5. The narrow deep trench leveling device as claimed in claim 1, wherein a second tension spring (22) is sleeved on the third piston rod (9), one end of the second tension spring (22) is fixed on the pressure plate (4), and the other end of the second tension spring is fixed on a cylinder body of the third piston cylinder (8).
6. The narrow deep trench leveling device as claimed in claim 1, wherein a through pipe is installed on the side wall of the lower end of the second piston cylinder (6), and a check valve (23) which can only allow air to enter the second piston cylinder (6) from the outside in a one-way manner is arranged on the through pipe.
7. The apparatus for smoothing narrow deep trench as claimed in claim 1, wherein the air pipe (10) is connected to the first piston cylinder (5) from the lower part of the outer circumferential surface of the first piston cylinder (5), and the upper part of the outer circumferential surface of the first piston cylinder (5) is provided with a through hole which can be connected to the upper end of the Z-shaped channel (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010593957.7A CN111676778A (en) | 2020-06-24 | 2020-06-24 | Narrow deep trench leveling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010593957.7A CN111676778A (en) | 2020-06-24 | 2020-06-24 | Narrow deep trench leveling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111676778A true CN111676778A (en) | 2020-09-18 |
Family
ID=72437050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010593957.7A Withdrawn CN111676778A (en) | 2020-06-24 | 2020-06-24 | Narrow deep trench leveling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111676778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112900203A (en) * | 2021-01-20 | 2021-06-04 | 张卫兵 | Road surface tamping device for highway engineering construction |
| CN113605317A (en) * | 2021-08-03 | 2021-11-05 | 陈家光 | Trench reinforcement apparatus for land reclamation |
-
2020
- 2020-06-24 CN CN202010593957.7A patent/CN111676778A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112900203A (en) * | 2021-01-20 | 2021-06-04 | 张卫兵 | Road surface tamping device for highway engineering construction |
| CN113605317A (en) * | 2021-08-03 | 2021-11-05 | 陈家光 | Trench reinforcement apparatus for land reclamation |
| CN113605317B (en) * | 2021-08-03 | 2022-11-08 | 浙江长兴市政建设有限公司 | Trench reinforcement apparatus for land reclamation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111501723A (en) | Roadside ditch leveling device | |
| CN111676778A (en) | Narrow deep trench leveling device | |
| CN113547629B (en) | Automatic pouring device for aerated concrete building blocks | |
| CN216341897U (en) | A combination formula drilling equipment for water conservancy construction | |
| CN111068393A (en) | Gravel and sand filter equipment for oil development | |
| CN216445762U (en) | Crack repairing device for highway construction | |
| CN206525652U (en) | A kind of self-dust-suction full-automatic drilling machine | |
| CN213107423U (en) | Adobe forming device for bricklaying preparation | |
| CN112177079A (en) | Excavation type cable laying vehicle with adjustable tightness | |
| CN111997117A (en) | High-efficient equipment that levels of ground for construction | |
| CN114319027B (en) | Highway construction concrete road surface levels device | |
| CN213681596U (en) | Compaction device for mechanical engineering | |
| CN1038776C (en) | Method and apparatus for foundation treatment | |
| CN115419128A (en) | Foundation local collapse repair equipment | |
| CN213530694U (en) | Automatic compaction device convenient for founding and casting of foam mould base | |
| CN213978468U (en) | Traffic engineering highway construction extrusion device | |
| CN213001020U (en) | Fragment of brick and concrete piece separator | |
| CN111945527B (en) | Integral type silica sand permeable material device of mating formation | |
| CN114150554A (en) | Road surface spreading and leveling machine | |
| CN220150274U (en) | Foundation leveling device | |
| CN111271067A (en) | Ore road wall miscellaneous stone scavenging machine | |
| CN220150016U (en) | Highway road surface leveling device | |
| CN112538849A (en) | Flat pressing assembly and engineering ground tamping equipment | |
| CN218148278U (en) | Longitudinal tamping device for building foundation tamping vehicle | |
| CN218345891U (en) | Road brick paving device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200918 |
|
| WW01 | Invention patent application withdrawn after publication |