CN113696338A - Road and bridge construction cement mortar agitating unit - Google Patents
Road and bridge construction cement mortar agitating unit Download PDFInfo
- Publication number
- CN113696338A CN113696338A CN202111029971.5A CN202111029971A CN113696338A CN 113696338 A CN113696338 A CN 113696338A CN 202111029971 A CN202111029971 A CN 202111029971A CN 113696338 A CN113696338 A CN 113696338A
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- Prior art keywords
- seat
- stirring
- processing box
- road
- blade
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/10—Mixing in containers not actuated to effect the mixing
- B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
- B28C5/16—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a vertical or steeply inclined axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/0806—Details; Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/0806—Details; Accessories
- B28C5/0831—Drives or drive systems, e.g. toothed racks, winches
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention relates to the technical field of cement processing, in particular to a cement mortar stirring device for road and bridge construction, which comprises a processing box, a feeding hole and a discharging hole, wherein the feeding hole and the discharging hole are arranged on the processing box, and the cement mortar stirring device further comprises: the stirring system is arranged in the processing box and is used for stirring the mortar; the tank wall cleaning system is arranged in the processing tank and used for cleaning mortar attached to the inner wall of the processing tank; wherein the agitation system comprises: the power source is arranged on the processing box; the stirring shaft is movably arranged in the processing box and is connected with a power source; and stirring leaf subassembly, quantity be a plurality of and all set up on the outer wall of (mixing) shaft, for the stirring leaf of traditional fixed mode, this device can improve the stirring treatment effect to the mortar for the mortar stirring in the processing incasement is more abundant even, has improved later stage road bridge construction quality.
Description
Technical Field
The invention relates to the technical field of cement processing, in particular to a cement mortar stirring device for road and bridge construction.
Background
Along with the development of technology, the contact between each district is more and more intensive frequent, this just leads to constructing sufficient road bridge and supplies each district people's round trip, and during road bridge construction, cement mortar batching is indispensable, and cement mortar batching need use the agitator to stir it before using for intensive mixing between the raw materials, and strengthen changing some its physical characteristics.
The existing stirring device comprises a motor and a stirring roller, the motor drives the stirring roller to rotate, and the mortar raw materials in the box body are stirred and mixed, so that the construction raw materials are obtained.
Traditional stirring roller simple structure, the mode of fixing a plurality of stirring leaf on the (mixing) shaft mostly stirs the mixture through the stirring leaf to the mortar, but has the space region between the adjacent stirring leaf, appears stirring dead angle easily or mixes insufficient phenomenon, influences the road bridge construction quality in later stage.
Disclosure of Invention
The invention aims to provide a cement mortar stirring device for road and bridge construction, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a road bridge construction cement mortar agitating unit, includes process box, feed inlet and bin outlet set up on the process box, still include:
the stirring system is arranged in the processing box and is used for stirring the mortar; and
the tank wall cleaning system is arranged in the processing tank and used for cleaning mortar attached to the inner wall of the processing tank; wherein
The stirring system includes:
the power source is arranged on the processing box;
the stirring shaft is movably arranged in the processing box and is connected with a power source; and
the stirring blade assemblies are a plurality of and are all arranged on the outer wall of the stirring shaft.
The application further adopts the technical scheme that: the stirring blade assembly comprises a main blade, a plurality of auxiliary blades, a roller, a sliding rod and an adjusting seat;
the utility model discloses a stirring shaft, including main blade, gyro wheel, connecting arm, regulation seat, and main blade, the main blade sets up on the (mixing) shaft, and the slide bar activity sets up in the main blade and is connected with the gyro wheel, and the slide bar passes through the elastic component to be connected with the main blade, and a plurality of assists the blade all with main blade elastic connection, every all be connected with the linking arm on the assistance blade, the linking arm runs through main blade and both sliding fit, adjust the seat setting on the slide bar and contradict the cooperation with the linking arm.
The application further adopts the technical scheme that: and a resistance reducing piece is arranged between the connecting arm and the adjusting seat and used for reducing the frictional resistance between the connecting arm and the adjusting seat.
The application further adopts the technical scheme that: the tank wall cleaning system comprises:
the execution module is movably arranged in the processing box; and
and the driving module is connected with the stirring shaft, and the stirring shaft controls the execution module to work through the driving module when moving.
This application still further technical scheme: the execution module comprises a sliding ring, a wall scraping blade and a pull rod;
the slide ring is movably arranged in the processing box, the pull rod is movably arranged in the processing box and connected between the slide rod and the driving module, and the wall scraping blade is arranged on the slide ring and is in clearance fit with the inner wall of the processing box.
This application still further technical scheme: the driving module comprises a mounting seat, a moving seat, a driving rod and an adjusting unit;
the mounting seat is arranged in the processing box, the movable base is movably arranged on the mounting seat and is connected with the execution module through the driving rod, and the adjusting unit is arranged between the stirring shaft and the movable base and can adjust the position of the movable base.
This application still further technical scheme: the adjusting unit comprises a sleeve seat, a counterweight ball, a sliding seat, a collision block and a trigger piece;
the cover seat cover is established on the (mixing) shaft, and the sliding seat activity sets up on the cover seat and both elastic connection, and counter weight ball and touch multitouch all set up on the sliding seat to, remove the seat and be located the removal route of touch multitouch, trigger the piece setting between sliding seat and cover seat, when the sliding seat displacement reaches the settlement threshold value, trigger the actual operating power of the adjustable power supply of piece.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the actual working power of the stepping motor is changed intermittently by utilizing the action of centrifugal force, so that the rotating speed of the stirring shaft is adjusted, the main blade rotates along with the stirring shaft, the slide rod in the main blade reciprocates, and the auxiliary blade is driven to repeatedly open and close.
Drawings
FIG. 1 is a schematic structural diagram of a cement mortar stirring device for road and bridge construction in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a stirring blade assembly in a cement mortar stirring device for road and bridge construction in the embodiment of the invention;
FIG. 3 is an enlarged schematic structural view of a position A in the road and bridge construction cement mortar stirring device in the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a driving module in the road and bridge construction cement mortar stirring device in the embodiment of the invention;
FIG. 5 is a schematic structural diagram of rollers and sliding rods in a cement mortar stirring device for road and bridge construction in the embodiment of the invention.
The reference numerals in the schematic drawings illustrate:
1-processing box, 2-stepping motor, 3-feeding hole, 4-discharging hole, 5-stirring shaft, 6-stirring blade component, 61-main blade, 62-auxiliary blade, 63-roller, 64-sliding rod, 65-adjusting seat, 66-tension spring, 67-ball, 68-connecting arm, 7-driving module, 71-sleeve seat, 72-counterweight ball, 73-sliding seat, 74-contact block, 75-mounting seat, 76-driving rod, 77-moving seat, 78-conductive column, 79-conductive sheet, 8-slip ring, 9-wall scraping blade and 10-pull rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention, and the present invention is further described with reference to the embodiments below.
Referring to fig. 1-5, in an embodiment of the present application, a cement mortar mixing device for road and bridge construction includes a processing box 1, a feeding port 3, and a discharging port 4, where the feeding port 3 and the discharging port 4 are disposed on the processing box 1, and further includes:
the stirring system is arranged in the processing box 1 and is used for stirring the mortar; and
the tank wall cleaning system is arranged in the processing tank 1 and is used for cleaning mortar attached to the inner wall of the processing tank 1; wherein
The stirring system includes:
the power source is arranged on the processing box 1;
the stirring shaft 5 is movably arranged in the processing box 1 and is connected with a power source; and
the stirring blade assemblies 6 are a plurality of and are all arranged on the outer wall of the stirring shaft 5.
In this embodiment, the power source may be a stepping motor 2 or a servo motor, in this embodiment, the power source is preferably a stepping motor 2, and as for the specific model of the stepping motor 2, a corresponding selection may be made according to actual situations, and is not limited specifically herein.
In the present embodiment, for example, the stirring blade assembly 6 includes a main blade 61, a plurality of auxiliary blades 62, a roller 63, a sliding rod 64, and an adjusting seat 65;
It should be noted that the elastic member may be a spring, an elastic steel plate or an elastic rubber structure, and in this embodiment, the elastic member is preferably a tension spring 66, and the tension spring 66 is connected between the sliding rod 64 and the main blade 61.
It should be added that a resistance reducing member is provided between the connecting arm 68 and the adjusting seat 65 for reducing the frictional resistance therebetween.
Of course, the resistance reducing member may be a ball 67 or a rotating wheel, and in this embodiment, the resistance reducing member is preferably the ball 67, and the ball 67 is slidably embedded at one end of the connecting arm 68.
In practical application, cement mortar is poured into the processing box 1 along the feeding hole 3, the step motor 2 rotates to drive the stirring shaft 5 to rotate and the stirring blade assembly 6 to rotate, the actual working power of the step motor 2 is changed intermittently, the rotating speed of the step motor 2 is adjusted, under the action of centrifugal force and elastic restoring force of the tension spring 66, the idler wheel 63 and the slide rod 64 are driven to move towards the inner wall of the processing box 1 relative to the main blade 61, in the process, the auxiliary blade 62 is driven to reciprocate relative to the main blade 61 under the interference effect between the adjusting seat 65 and the connecting arm 68, the stirring effect on the mortar is improved, the mortar in the processing box 1 is stirred more fully and uniformly, the construction quality of a later road bridge is improved, and the inner wall of the processing box 1 is cleaned through the box wall cleaning system while the stirring shaft 5 moves, avoid the mortar to adhere to and influence the stirring work in later stage on 1 inner wall of processing case, avoid artifical manual clearance, reduced intensity of labour.
Referring to fig. 1, 3 and 4, as another preferred embodiment of the present application, the tank wall cleaning system includes:
the execution module is movably arranged in the processing box 1; and
and the driving module 7 is connected with the stirring shaft 5, and the stirring shaft 5 controls the execution module to work through the driving module 7 when moving.
In a particular case of the present embodiment, the actuating module comprises a slide ring 8, a scraping edge 9 and a pull rod 10;
the sliding ring 8 is movably arranged in the processing box 1, the pull rod 10 is movably arranged in the processing box 1 and connected between the sliding rod 64 and the driving module 7, and the wall scraping blade 9 is arranged on the sliding ring 8 and is in clearance fit with the inner wall of the processing box 1.
It should be noted that the driving module 7 in this embodiment may use a linear motor or a hydraulic cylinder to directly drive the pull rod 10 to adjust the position of the wall scraping edge 9, and is not limited in this respect.
When the stirring shaft 5 rotates along with the stepping motor 2, the driving module 7 drives the pull rod 10 to reciprocate up and down in the direction shown in fig. 1, so as to drive the sliding ring 8 and the wall scraping blade 9 to reciprocate in the vertical direction, and further realize the cleaning work on the inner wall of the processing box 1.
Referring to fig. 1, 3 and 4, as another preferred embodiment of the present application, the driving module 7 includes a mounting seat 75, a moving seat 77, a driving rod 76 and an adjusting unit;
the mounting seat 75 is arranged in the processing box 1, the moving seat 77 is movably arranged on the mounting seat 75 and is connected with the execution module through the driving rod 76, and the adjusting unit is arranged between the stirring shaft 5 and the moving seat 77 and can adjust the position of the moving seat 77.
In the present embodiment, the adjusting unit includes a socket 71, a weight ball 72, a sliding socket 73, an interference block 74 and a trigger;
the cover seat 71 is sleeved on the stirring shaft 5, the sliding seat 73 is movably arranged on the cover seat 71 and is elastically connected with the sliding seat 71, the counterweight ball 72 and the contact block 74 are arranged on the sliding seat 73, the moving seat 77 is positioned on a moving path of the contact block 74, the trigger is arranged between the sliding seat 73 and the cover seat 71, and when the moving distance of the sliding seat 73 reaches a set threshold value, the trigger can adjust the actual working power of the power source.
Specifically, the triggering member includes a conductive post 78 and a conductive plate 79, the conductive plate 79 is disposed on the sliding seat 73, the conductive post 78 is disposed on the sleeve seat 71, and the conductive plate 79 is located on a moving path of the conductive post 78, as shown in fig. 4;
of course, the triggering member in this embodiment is not limited to the above-mentioned alternative mechanical structure, and may be replaced by an infrared distance measuring sensor or a laser distance measuring sensor, for example, the moving distance of the sliding seat 73 is measured by the infrared distance measuring sensor, and when the moving distance of the sliding seat 73 reaches a desired position, the infrared distance measuring sensor controls the speed of the stepping motor 2 to adjust, which is not specifically described herein.
When the step motor 2 drives the stirring shaft 5 and the sleeve seat 71 to rotate together, the step motor 2 drives the counterweight ball 72 and the sliding seat 73 to move towards the inner wall of the processing box 1 under the action of centrifugal force, in the process, the abutting block 74 meets the moving seat 77 and drives the moving seat 77 to move, under the action of the driving rod 76, the pull rod 10 is driven to move upwards as shown in fig. 1, and further the wall scraping blade 9 is driven to move upwards to clean mortar attached to the inner wall of the processing box 1, when the conducting strip 79 contacts with the conducting post 78, the step motor 2 is triggered to reduce the speed, and further under the action of elastic restoring force between the sliding seat 73 and the sleeve seat 71, the sliding seat 73 and the moving seat 77 are driven to reset, so that the wall scraping blade 9 moves downwards to reset and reciprocate, the up and down reciprocating motion of the wall scraping blade 9 is realized, and it needs to be added that the counterweight ball 72 just beats the inner wall of the processing box 1 when moving to the limit position, thereby make the mortar of processing case 1 inner wall shake and fall, further improve the clearance effect to processing case 1 inner wall.
The working principle of the application is as follows:
cement mortar is poured into the processing box 1 along the feeding hole 3, the step motor 2 rotates to drive the stirring shaft 5 to rotate and the stirring blade assembly 6 to rotate, the actual working power of the step motor 2 is changed intermittently, so that the rotating speed of the step motor 2 is adjusted, under the action of centrifugal force and elastic restoring force of the tension spring 66, the roller 63 and the slide rod 64 are driven to move towards the inner wall of the processing box 1 relative to the main blade 61, in the process, the auxiliary blade 62 is driven to reciprocate relative to the main blade 61 under the action of interference between the adjusting seat 65 and the connecting arm 68, so that the stirring effect on the mortar is improved, the mortar in the processing box 1 is stirred more fully and uniformly, the construction quality of a later road bridge is improved, the sleeve seat 71 is driven to synchronously rotate while the stirring shaft 5 moves, and the counterweight ball 72 and the slide seat 73 are driven to move towards the inner wall of the processing box 1 under the action of the centrifugal force, in the process, the abutting block 74 meets the moving seat 77 and drives the moving seat 77 to move, under the action of the driving rod 76, the pull rod 10 is driven to move upwards as shown in fig. 1, so as to drive the wall scraping blade 9 to move upwards to clean mortar attached to the inner wall of the processing box 1, when the conducting strip 79 is contacted with the conducting column 78, the stepping motor 2 is triggered to reduce the speed, and further under the action of elastic restoring force between the sliding seat 73 and the sleeve seat 71, the sliding seat 73 and the moving seat 77 are driven to reset, so that the wall scraping blade 9 moves downwards to reset and reciprocates in a circle manner, so that the wall scraping blade 9 reciprocates up and down, the fact that the counterweight ball 72 just strikes the inner wall of the processing box 1 when moving to a limit position needs to be supplemented, so that the mortar on the inner wall of the processing box 1 falls, the cleaning effect on the inner wall of the processing box 1 is further improved, and the mortar is prevented from attaching to the inner wall of the processing box 1 to influence later-stage stirring work, manual cleaning is avoided, and labor intensity is reduced.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a road bridge construction cement mortar agitating unit, includes processing case, feed inlet and bin outlet set up on the processing case, its characterized in that still includes:
the stirring system is arranged in the processing box and is used for stirring the mortar; and
the tank wall cleaning system is arranged in the processing tank and used for cleaning mortar attached to the inner wall of the processing tank; wherein
The stirring system includes:
the power source is arranged on the processing box;
the stirring shaft is movably arranged in the processing box and is connected with a power source; and
the stirring blade assemblies are a plurality of and are all arranged on the outer wall of the stirring shaft.
2. The road and bridge construction cement mortar stirring device of claim 1, wherein the stirring blade assembly comprises a main blade, a plurality of auxiliary blades, a roller, a sliding rod and an adjusting seat;
the utility model discloses a stirring shaft, including main blade, gyro wheel, connecting arm, regulation seat, and main blade, the main blade sets up on the (mixing) shaft, and the slide bar activity sets up in the main blade and is connected with the gyro wheel, and the slide bar passes through the elastic component to be connected with the main blade, and a plurality of assists the blade all with main blade elastic connection, every all be connected with the linking arm on the assistance blade, the linking arm runs through main blade and both sliding fit, adjust the seat setting on the slide bar and contradict the cooperation with the linking arm.
3. The road and bridge construction cement mortar mixing device of claim 2, wherein a resistance reducing member is provided between the connecting arm and the adjusting seat for reducing frictional resistance therebetween.
4. The road and bridge construction cement mortar mixing device of claim 1, wherein the box wall cleaning system comprises:
the execution module is movably arranged in the processing box; and
and the driving module is connected with the stirring shaft, and the stirring shaft controls the execution module to work through the driving module when moving.
5. The road and bridge construction cement mortar mixing device of claim 4, wherein the execution module comprises a slip ring, a wall scraping blade and a pull rod;
the slide ring is movably arranged in the processing box, the pull rod is movably arranged in the processing box and connected between the slide rod and the driving module, and the wall scraping blade is arranged on the slide ring and is in clearance fit with the inner wall of the processing box.
6. The road and bridge construction cement mortar mixing device according to claim 4 or 5, wherein the driving module comprises a mounting seat, a moving seat, a driving rod and an adjusting unit;
the mounting seat is arranged in the processing box, the movable base is movably arranged on the mounting seat and is connected with the execution module through the driving rod, and the adjusting unit is arranged between the stirring shaft and the movable base and can adjust the position of the movable base.
7. The road and bridge construction cement mortar mixing device according to claim 6, wherein the adjusting unit comprises a sleeve seat, a counterweight ball, a sliding seat, an interference block and a trigger piece;
the cover seat cover is established on the (mixing) shaft, and the sliding seat activity sets up on the cover seat and both elastic connection, and counter weight ball and touch multitouch all set up on the sliding seat to, remove the seat and be located the removal route of touch multitouch, trigger the piece setting between sliding seat and cover seat, when the sliding seat displacement reaches the settlement threshold value, trigger the actual operating power of the adjustable power supply of piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029971.5A CN113696338A (en) | 2021-09-03 | 2021-09-03 | Road and bridge construction cement mortar agitating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029971.5A CN113696338A (en) | 2021-09-03 | 2021-09-03 | Road and bridge construction cement mortar agitating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113696338A true CN113696338A (en) | 2021-11-26 |
Family
ID=78658996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111029971.5A Withdrawn CN113696338A (en) | 2021-09-03 | 2021-09-03 | Road and bridge construction cement mortar agitating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113696338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290519A (en) * | 2021-12-30 | 2022-04-08 | 穆俊丽 | Concrete mixer is used in road and bridge construction |
-
2021
- 2021-09-03 CN CN202111029971.5A patent/CN113696338A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290519A (en) * | 2021-12-30 | 2022-04-08 | 穆俊丽 | Concrete mixer is used in road and bridge construction |
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Application publication date: 20211126 |
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| WW01 | Invention patent application withdrawn after publication |