CN214871510U - Three-dimensional precast concrete spare production maintenance circulation operation platform - Google Patents
Three-dimensional precast concrete spare production maintenance circulation operation platform Download PDFInfo
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- CN214871510U CN214871510U CN202121140585.9U CN202121140585U CN214871510U CN 214871510 U CN214871510 U CN 214871510U CN 202121140585 U CN202121140585 U CN 202121140585U CN 214871510 U CN214871510 U CN 214871510U
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Abstract
The utility model provides a three-dimensional concrete prefabricated member production maintenance circulation operation platform, the operation platform includes: the pit comprises a first station, a second station, a third station and a fourth station which are used for placing the fixed mould table; wherein, the pit middle part is equipped with the barricade that is used for keeping apart third station and fourth station, the pit has the sealed skirtboard that is used for keeping apart first station and fourth station corresponding the top of fourth station, so that the fourth station forms sealed maintenance room, four stations are three-dimensional distribution, but the required space of greatly reduced muddy clean soil operation, the productivity in workshop has been released to the at utmost, four stations circulate the fixed mould platform, the assembly line operation, the production efficiency is greatly improved, set up independent maintenance room, can promote the maintenance effect. The maintenance cost is reduced, energy can be saved, thermal maintenance can be performed on part of components which cannot be subjected to thermal maintenance originally, and the production efficiency is accelerated.
Description
Technical Field
The utility model belongs to the technical field of the precast concrete unit operation, concretely relates to three-dimensional precast concrete spare production maintenance circulation operation platform.
Background
With the development of the market, the assembled building is hot and hot day by day, and in the prefabricated part production process, mainly include two kinds of production schemes: production line type production and fixed die table production.
The existing fixed die table occupies a large factory area, a layer of soft or hard thermal insulation material needs to be covered during maintenance, the labor cost during maintenance is additionally increased, the operation convenience is limited, the thermal insulation material cannot be too thick, the energy loss is large in the thermal maintenance process, and the maintenance cost is high. The maintenance cost occupies a large cost proportion in the pc products, and some pc products abandon thermal maintenance in order to reduce the maintenance cost, and adopt a natural maintenance method, so that the production period is long, the equipment turnover rate is low, the productivity is low, the uniform spreading cost is high, and the quality of the pc components cannot be guaranteed.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough among the above-mentioned prior art, provide an area is little, the convenient, can reduce the operation panel of maintenance cost of component operation circulation.
In order to achieve the above object, the present invention provides the following technical solutions:
a three-dimensional precast concrete production maintenance circulation operation platform, the operation platform includes:
the pit comprises a first station, a second station, a third station and a fourth station which are used for placing the fixed mould table;
the first station is arranged on the upper edge of one side of the pit and is provided with a first carrier roller group which can stretch into the inner wall of the pit so as to place the fixed die table when the first carrier roller group extends out;
the second station is arranged on the upper edge of one side of the pit, which is opposite to the first station, and is provided with a second carrier roller group which can stretch into the inner wall of the pit so as to place the fixed die table when the second carrier roller group stretches out;
the third station is arranged right below the second station, is provided with a third carrier roller group for placing the fixed mould table, and is provided with a first lifter which is arranged at the bottom of the pit and is used for lifting the fixed mould table to move between the second station and the third station;
the fourth station is arranged right below the first station, is provided with a fourth carrier roller group for placing the fixed mould table, and is arranged at the bottom of the pit;
the middle of the pit is provided with a retaining wall for isolating the third station and the fourth station, and a sealing apron board for isolating the first station and the fourth station is arranged above the pit corresponding to the fourth station so as to form a sealed curing chamber for the fourth station.
Preferably, the sealing skirt plate is distributed in the circumferential direction of the fourth station and abuts against the lower edge of the fixed die table at the first station to form a seal for the fourth station.
Preferably, one side of the sealing skirt plate is hinged to the inner wall of the pit, and the other side of the sealing skirt plate is driven by an air rod to abut against the lower edge of the fixed mold table located at the first station.
Preferably, the first carrier roller group and the second carrier roller group are located on the same horizontal plane and distributed in the same direction, so that the fixed mold platform located at the first station can move towards the second station under the driving of external force.
Preferably, the first carrier roller set comprises a plurality of horizontal oil cylinders respectively and correspondingly arranged at two ends of the first station, piston ends of the horizontal oil cylinders horizontally extend and retract to the inner wall of the pit, and the piston ends are provided with rolling sleeves to form carrier rollers;
correspondingly, the second carrier roller group comprises a plurality of horizontal oil cylinders which are respectively and correspondingly arranged at two ends of the second station, piston ends of the horizontal oil cylinders horizontally stretch out and draw back on the inner wall of the pit, and the piston ends are provided with rolling sleeves to form carrier rollers.
Preferably, the third carrier roller set comprises a plurality of fixed carrier rollers;
the fourth carrier roller group comprises a plurality of fixed carrier rollers, and the fourth carrier roller group and the third carrier roller group are located on the same horizontal plane, so that the fixed die table located at the third station can move towards the fourth station under the driving of external force.
In the above three-dimensional precast concrete production maintenance cycle workbench, preferably, the upper surface of the retaining wall is not higher than the upper surfaces of the first carrier roller group and the second carrier roller group;
and a folding door is arranged in the middle of the retaining wall, so that the retaining wall can be positioned at the third station and the fixed die table can move towards the fourth station.
Preferably, the first lifter is a plurality of longitudinal oil cylinders circumferentially distributed about the third station, and piston ends of the longitudinal oil cylinders can longitudinally reciprocate between the third station and the second station;
the second lifter is a plurality of longitudinal oil cylinders circumferentially distributed about the fourth station, and piston ends of the longitudinal oil cylinders can longitudinally reciprocate between the fourth station and the first station.
In the above three-dimensional concrete preform production, maintenance and cycle workbench, preferably, the sidewall of the pit corresponding to the fourth station is provided with an air hole, and the air hole is connected to a steam supply device to supply steam to the fourth station.
Preferably, the pit is provided with an insulating layer corresponding to the fourth station.
Has the advantages that: four stations are the three-dimensional distribution, but the required space of greatly reduced muddy clean soil operation, and the productivity in workshop has been released to the at utmost, and four stations circulate the fixed mould platform, and assembly line work has improved production efficiency greatly, sets up independent curing chamber, can promote the maintenance effect.
The maintenance cost is reduced, energy can be saved, thermal maintenance can be carried out on part of components which cannot be subjected to thermal maintenance originally, the production efficiency is accelerated, the overall productivity is greatly improved, and the profit of enterprises is increased.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of a workbench according to an embodiment of the present invention.
Illustration of the drawings: 1. a second lift; 2. air holes; 3. a folding door; 4. a first carrier roller set; 5. a second carrier roller set; 6. a third carrier roller set; 7. a fourth carrier roller set; 8. sealing the apron board; 9. a position sensor; 10. a gas lever; 11. fixing a mould table; 12. a first lift; 13. a first station; 14. a second station; 15. a third station; 16. and a fourth station.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", 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 of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1, a three-dimensional concrete prefabricated member production maintenance cycle operation platform comprises:
the pit comprises a first station 13, a second station 14, a third station 15 and a fourth station 16 for placing the fixed mould table 11;
the first station 13 is arranged on the upper edge of one side of the pit and is provided with a first carrier roller group 4 which can stretch into the inner wall of the pit so as to place the fixed die table 11 when the first carrier roller group 4 stretches out;
the second station 14 is arranged at the upper edge of one side of the pit, which is opposite to the first station 13, and is provided with a second carrier roller group 5 which can stretch into the inner wall of the pit so as to place the fixed die table 11 when the second carrier roller group 5 stretches out;
the third station 15 is arranged right below the second station 14, is provided with a third carrier roller group 6 for placing the fixed mould table 11 and a first lifter 12 which is arranged at the bottom of the pit and is used for lifting the fixed mould table 11 to move between the second station 14 and the third station 15;
the fourth station 16 is arranged right below the first station 13, is provided with a fourth carrier roller group 7 for placing the fixed mould table 11 and is arranged at the bottom of the pit, and is used for lifting the fixed mould table 11 to move between the first station 13 and the fourth station 16;
wherein, the middle part of the pit is provided with a retaining wall for isolating the third station 15 from the fourth station 16, and a sealing skirt board 8 for isolating the first station 13 from the fourth station 16 is arranged above the pit corresponding to the fourth station 16, so that the fourth station 16 forms a sealed curing chamber.
Pit area and 2 fixed mould platform 11 looks adaptations, simultaneously, place fixed mould platform 11 back on first station 13 and the second station 14, fixed mould platform 11 upper plane and ground parallel and level or be higher than ground slightly, the height so that the workman operates as the standard.
Through setting up half underground formula three-dimensional operation space, on 2 fixed mould platform 11's positions originally, set up four fixed mould platform 11 and put the station, put 3 fixed mould platform 11 on four stations, reach the mode increase equipment productivity that the unit area increases mould platform quantity.
In another alternative embodiment of the present application, there are a plurality of sealing skirts 8, and a plurality of sealing skirts 8 are distributed in the circumferential direction of the fourth station 16 and abut against the lower edge of the stationary mold table 11 located at the first station 13 to form a seal with the fourth station 16. Because the bottom of the fixed die table 11 is in a sealed state, when the apron plate at the sealed end and the fixed die table 11 positioned at the first station 13 are sealed with each other, the upper part of the fourth station 16 is sealed, and meanwhile, the side wall of the pit and the retaining wall seal the circumferential direction of the fourth station 16, so that the fourth station 16 forms an independent and closed curing chamber, the heat loss is effectively reduced, and the curing cost is saved.
In an alternative embodiment of the present application, the sealing skirt 8 is hinged on one side to the inner wall of the pit and on the other side is driven by a gas lever 10 to abut against the lower edge of a stationary mould table 11 located at a first station 13.
One end of the air rod 10 is hinged to the inner wall of the pit, the other end of the air rod is connected to the non-hinged side of the sealing skirt plate 8 in a connecting mode, and after the fixed die table 11 is placed at the first station 13, the sealing skirt plate 8 is driven to rotate upwards and abut against the lower edge of the fixed die plate, and therefore sealing is achieved.
In this embodiment, the number of the sealing skirt boards 8 is 4, the 4 sealing skirt boards 8 correspond to the inner walls of the pit around the fourth station 16 (one side of the inner walls is a retaining wall), sealing rubber strips can be arranged on the non-hinged ends of the sealing skirt boards 8, the fixed die table 11 is extruded and maintained through the driving sealing difference of the air rods 10, and the sealing effect is improved through the sealing rubber strips.
Correspondingly, when the fixed die table 11 at the fourth station 16 is moved upwards to the first station 13, the first idler group 4 is retracted, and the sealing skirt plate 8 is driven by the air rod 10 to be attached to the inner wall of the pit, so that a channel is provided for the fixed die table 11 to move upwards to the first station 13.
In an alternative embodiment of the present application, the first set of carrier rollers 4 is located at the same level as the second set of carrier rollers 5 and is distributed in the same direction so that the stationary mold table 11 located at the first station 13 can be moved towards the second station 14 by an external force. The fixed die table 11 located at the first station 13 can be moved to the second station 14 by means of manual pushing, hydraulic cylinder driving, motor driving and the like.
In this embodiment, the first idler set 4 includes a plurality of horizontal oil cylinders respectively and correspondingly disposed at two ends of the first station 13, piston ends of the horizontal oil cylinders horizontally extend and retract on an inner wall of the pit, and the piston ends are provided with roller sleeves to form idlers;
correspondingly, the second carrier roller group 5 comprises a plurality of horizontal oil cylinders which are respectively and correspondingly arranged at two ends of the second station 14, the piston ends of the horizontal oil cylinders horizontally stretch out and draw back on the inner wall of the pit, and the piston ends are provided with roller sleeves to form carrier rollers.
The horizontal oil cylinder is embedded into the inner wall of the pit and extends out when the fixed die table 11 needs to be supported, the piston end of the horizontal oil cylinder is provided with a rolling sleeve, the fixed die table 11 can move through the rolling sleeve, friction force is reduced, the horizontal oil cylinders of the first carrier roller group 4 and the second carrier roller group 5 are distributed in the same direction, and the fixed die table 11 can move freely between the first station 13 and the second station 14.
In another alternative embodiment of the present application, the third idler set 6 comprises a plurality of fixed idlers; the fourth carrier roller group 7 comprises a plurality of fixed carrier rollers, and the fourth carrier roller group 7 and the third carrier roller group 6 are positioned at the same horizontal plane, so that the fixed die table 11 positioned at the third station 15 can move towards the fourth station 16 under the driving of external force.
Wherein the fixed idlers may be conventional fixed, horizontally disposed idlers.
In this embodiment, the retaining wall upper surface is not higher than the upper surfaces of the first and second idler sets 4 and 5, thereby ensuring that the stationary die table 11 can move between the first and second stations 13 and 14.
The middle part of the retaining wall is provided with a folding door 3 which is provided with a driving motor to drive the folding door 3 to open and close (the folding door 3 can also be a sliding door, a rolling door and the like) so as to move the fixed mould platform 11 positioned at the third station 15 to the fourth station 16. A moving channel of the fixed die table 11 is formed by the folding door 3, and after the fixed die table 11 is moved from the third station 15 to the fourth station 16, the folding door 3 is closed, so that the fourth station 16 can be sealed.
In another alternative embodiment of the present application, the first lift 12 is a plurality of longitudinal cylinders circumferentially distributed about the third station 15, the piston ends of the longitudinal cylinders being longitudinally reciprocable between the third station 15 and the second station 14; stability in the moving process of the fixed die table 11 is ensured by a plurality of longitudinal oil cylinders, wherein the longitudinal oil cylinders penetrate through gaps between the carrier rollers of the third carrier roller group 6.
The second lift 1 is a plurality of longitudinal cylinders circumferentially distributed about the fourth station 16, the piston ends of which are longitudinally reciprocable between the fourth station 16 and the first station 13. The stability of the fixed die table 11 during movement is ensured by a plurality of longitudinal cylinders which pass through the gaps between the carrier rollers of the fourth carrier roller group 7.
In this embodiment, the number of the longitudinal cylinders in the first lifter 12 is four, and the four longitudinal cylinders correspond to four corners of the fixed die table 11 respectively. The number of the longitudinal oil cylinders in the second lifter 1 is four, and the four longitudinal oil cylinders correspond to four corners of the fixed die table 11 respectively.
In another alternative embodiment of the present application, the sidewall of the pit corresponding to the fourth station 16 is provided with an air hole 2, and the air hole 2 is connected with a steam supply device to supply steam to the fourth station 16. The pit is correspondingly provided with a heat insulation layer corresponding to the fourth station 16. Meanwhile, the heat insulation material is fixed in position and does not participate in movement, so that the heat insulation material can be thicker and is tightly sealed, heat loss is effectively reduced when thermal maintenance is carried out, and maintenance cost is saved.
In the actual production operation, three fixed mould platforms 11 are arranged on the operation platform for circulation, namely, a first station 13, a third station 15 and a fourth station 16 have the fixed mould platforms 11 in the initial state, after the operation of the fixed mould platforms 11 at the first station 13 is finished, a sealing apron plate 8 rotates downwards to be separated from the lower edge of the fixed mould platforms 11, the fixed mould platforms 11 are pushed to move towards a second station 14 through driving equipment (which can be a horizontally arranged oil cylinder) or manpower, the fixed mould platforms 11 are transported to the second station 14 for temporary storage, at the moment, the first station 13 is left, a first carrier roller group 4 is retracted into the inner wall of a ground through hydraulic equipment to form a transportation channel from the fourth station 16 to the first station 13, the fixed mould platforms 11 which are completely thermally cured at the fourth station 16 are lifted to the upper part of the first station 13 through a second lifter 1, and then the first carrier roller group 4 extends out of the inner wall of the ground to support the fixed mould platforms 11, the fixed mold table 11 of the fourth station 16 is transferred to the first station 13; the first lifter 12 retracts to the bottom of the pit, the sealing skirt plate 8 is upwards abutted and transferred to the lower edge of the fixed die table 11 of the first station 13 to seal the upper part of the fourth station 16, heat is guaranteed not to be dissipated through the upper part of the fourth station 16, and the first station 13 can start normal process operation at the moment.
The folding door 3 between the third station 15 and the fourth station 16 is opened, the fixed mold table 11 positioned at the third station 15 is moved to the fourth station 16 through manpower or driving equipment (can be a horizontally arranged oil cylinder), the folding door 3 between the third station 15 and the fourth station 16 is closed, the fixed mold table 11 is moved to the fourth station 16, and steam can be supplied for thermal curing.
Raise the fixed mould platform 11 that first lift 12 upwards supported second station 14 department, the horizontal hydro-cylinder of second bearing roller group 5 retracts the pit inner wall, will temporarily exist on the second station 14 fixed mould platform 11 move down to the third bearing roller group 6 of third station 15 department, and retract first lift 12 pit bottom, can accomplish once operation circulation, wait for the operation completion of first station 13 department can realize next circulation, whole process cooperation maintenance, can realize 3 mould platforms reach the complete cycle within 1 day, realize that the position product of 2 mould platforms reaches the output of 3 mould platforms every day.
In some embodiments, the first station 13, the second station 14, the third station 15 and the fourth station 16 are provided with position sensors 9 corresponding to the fixed mold table 11, so as to ensure the accuracy of the position movement of the fixed mold table 11.
In some embodiments, power devices may also be provided on the first, second, third and fourth idler sets 4, 5, 6, 7 to drive the stationary die table 11 to circulate.
In some embodiments, the drives of the air rods 10, the horizontal oil cylinder, the longitudinal oil cylinder and the driving device are all controlled through the control cabinet, so that the electric automation is realized, and the labor intensity of workers is reduced.
To sum up, this application provides a three-dimensional precast concrete spare production maintenance circulation operation platform, and four stations are three-dimensional and distribute, but the required space of greatly reduced muddy clean soil operation, the at utmost has released the productivity in workshop, and four stations circulate fixed die platform 11, and assembly line operation has improved production efficiency greatly, sets up independent maintenance room, can promote the maintenance effect. The maintenance cost is reduced, energy can be saved, thermal maintenance can be carried out on part of components which cannot be subjected to thermal maintenance originally, the production efficiency is accelerated, the overall productivity is greatly improved, and the profit of enterprises is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the following claims are intended to cover all modifications, equivalents, and improvements falling within the spirit and principles of the present invention.
Claims (10)
1. The utility model provides a three-dimensional precast concrete production maintenance circulation operation platform which characterized in that, the operation platform includes:
the pit comprises a first station, a second station, a third station and a fourth station which are used for placing the fixed mould table;
the first station is arranged on the upper edge of one side of the pit and is provided with a first carrier roller group which can stretch into the inner wall of the pit so as to place the fixed die table when the first carrier roller group extends out;
the second station is arranged on the upper edge of one side of the pit, which is opposite to the first station, and is provided with a second carrier roller group which can stretch into the inner wall of the pit so as to place the fixed die table when the second carrier roller group stretches out;
the third station is arranged right below the second station, is provided with a third carrier roller group for placing the fixed mould table, and is provided with a first lifter which is arranged at the bottom of the pit and is used for lifting the fixed mould table to move between the second station and the third station;
the fourth station is arranged right below the first station, is provided with a fourth carrier roller group for placing the fixed mould table, and is arranged at the bottom of the pit;
the middle of the pit is provided with a retaining wall for isolating the third station and the fourth station, and a sealing apron board for isolating the first station and the fourth station is arranged above the pit corresponding to the fourth station so as to form a sealed curing chamber for the fourth station.
2. The stereoscopic precast concrete production and maintenance cycle workbench according to claim 1, wherein the sealing skirt panels are distributed in the circumferential direction of the fourth station and abut against the lower edge of the fixed mold platform of the first station to form a seal with the fourth station.
3. A stereoscopic precast concrete production and maintenance cycle workbench according to claim 2, wherein the sealing skirt board is hinged on one side to the inner wall of the pit, and the other side is driven by an air lever to abut against the lower edge of the fixed mold platform at the first station.
4. A stereoscopic precast concrete production and maintenance cycle table according to claim 1, wherein the first idler set and the second idler set are positioned on the same horizontal plane and distributed in the same direction, so that the fixed mold table at the first station can move towards the second station under the driving of external force.
5. The stereoscopic concrete precast member production, maintenance and cycle operation table according to claim 4, wherein the first carrier roller set comprises a plurality of horizontal oil cylinders respectively and correspondingly arranged at two ends of the first station, piston ends of the horizontal oil cylinders horizontally extend and retract to the inner wall of the pit, and the piston ends are provided with roller sleeves to form carrier rollers;
correspondingly, the second carrier roller group comprises a plurality of horizontal oil cylinders which are respectively and correspondingly arranged at two ends of the second station, piston ends of the horizontal oil cylinders horizontally stretch out and draw back on the inner wall of the pit, and the piston ends are provided with rolling sleeves to form carrier rollers.
6. The stereoscopic concrete precast member production and maintenance cycle work table according to claim 1, wherein the third carrier roller set comprises a plurality of fixed carrier rollers;
the fourth carrier roller group comprises a plurality of fixed carrier rollers, and the fourth carrier roller group and the third carrier roller group are located on the same horizontal plane, so that the fixed die table located at the third station can move towards the fourth station under the driving of external force.
7. The three-dimensional precast concrete production and curing cycle workbench according to claim 6, wherein,
the upper surface of the baffle wall is not higher than the upper surfaces of the first carrier roller group and the second carrier roller group;
and a folding door is arranged in the middle of the retaining wall, so that the retaining wall can be positioned at the third station and the fixed die table can move towards the fourth station.
8. A stereoscopic precast concrete production and maintenance cycle workbench according to claim 1, wherein the first lifter is a plurality of longitudinal cylinders circumferentially distributed about the third station, piston ends of the longitudinal cylinders being longitudinally reciprocable between the third station and the second station;
the second lifter is a plurality of longitudinal oil cylinders circumferentially distributed about the fourth station, and piston ends of the longitudinal oil cylinders can longitudinally reciprocate between the fourth station and the first station.
9. A stereoscopic precast concrete production and maintenance cycle workbench according to claim 1, wherein the side wall of the pit corresponding to the fourth station is provided with air holes, and the air holes are connected with steam supply equipment to supply steam to the fourth station.
10. A three-dimensional precast concrete production, maintenance and cycle operation platform according to claim 9, wherein the pit is provided with an insulating layer corresponding to the fourth station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121140585.9U CN214871510U (en) | 2021-05-21 | 2021-05-21 | Three-dimensional precast concrete spare production maintenance circulation operation platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121140585.9U CN214871510U (en) | 2021-05-21 | 2021-05-21 | Three-dimensional precast concrete spare production maintenance circulation operation platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214871510U true CN214871510U (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121140585.9U Active CN214871510U (en) | 2021-05-21 | 2021-05-21 | Three-dimensional precast concrete spare production maintenance circulation operation platform |
Country Status (1)
| Country | Link |
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| CN (1) | CN214871510U (en) |
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2021
- 2021-05-21 CN CN202121140585.9U patent/CN214871510U/en active Active
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