CN216032648U - Sleeper - Google Patents
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- CN216032648U CN216032648U CN202023296250.4U CN202023296250U CN216032648U CN 216032648 U CN216032648 U CN 216032648U CN 202023296250 U CN202023296250 U CN 202023296250U CN 216032648 U CN216032648 U CN 216032648U
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Abstract
The application discloses a sleeper, which comprises a sleeper core material and a sleeper base material, wherein the sleeper core material is positioned in a position where a spike is installed in the sleeper, and the sleeper core material is positioned in the sleeper base material; the length of the sleeper core material is the same as that of the sleeper and is parallel to the sleeper; the density of the sleeper core material is greater than or equal to that of the sleeper; the sleeper core material comprises first fibers and first resin, the sleeper base material comprises second fibers and second resin, and the arrangement direction of the first fibers and the second fibers is parallel to the length direction of the sleeper. This application adopts the mode that increases the sleeper core, controls the glass fiber quantity that needs the flooding in the flooding stage to avoid rubbing the inequality, can realize again that the dull and stereotyped bonding of non-secondary and once big thickness is whole shaping, and product cross section fibre content and product density are steerable within the required scope.
Description
Technical Field
This document relates to, but is not limited to, the field of rail transit, and composite technology and articles, and more particularly, but not exclusively, to a non-laminated bonded one-shot composite sleeper.
Background
The synthetic sleeper is a general name of sleepers reinforced by short fibers or continuous fibers by using natural organic matters or artificially synthesized high polymer materials as a matrix, and commonly comprises glass fiber reinforced polyurethane foam material sleepers, polyethylene or polypropylene-based thermoplastic sleepers, rubber-based thermosetting sleepers, bamboo and wood and other natural fiber synthetic sleepers and the like. The synthetic sleeper has the density, the strength and the processing performance which are equivalent to those of a wooden sleeper, is convenient for engineering design, field construction, application and maintenance, has the advantages of no water absorption (or extremely low water absorption), strong aging corrosion resistance and the like, becomes an ideal wooden sleeper substitute material, and is increasingly applied to the field of rail transit.
When the sleeper is used for light axle load lines such as urban rail transit and the like, the thickness of the sleeper is generally 140mm to 160 mm, and the density is 640kg/m3To 840kg/m3(ii) a When a large-axle load line such as a state railway, a high-speed railway, a heavy haul railway and the like or a city railway with higher speed is used, the thickness of the sleeper is generally 230 to 260 millimeters, and the density is 1100kg/m3To 1300kg/m3. The number of sleeper fibers with the thickness of 70 mm used in light axle load lines such as urban rail transit is generally 700, and 1400 sleeper fibers with the thickness of 140mm are needed for forming the sleeper; big of forming iron, high-speed rail, heavy haul railway, etcThe number of sleeper fibers with the thickness of 260 mm used for the axle load line is up to more than 4500, which is 6 to 7 times of the amount of the sleeper fibers used for the conventional sleeper with the thickness of 70 mm.
Generally, composite sleepers are produced by first producing about 70 mm thin plates by pultrusion, and then bonding two or more layers to a thickness required by the site after processing. The process has the defects that the process is complicated, the bonding quality is not easy to control, and the condition that a product fails due to cracking of a bonding surface occurs during actual use, so that the driving safety is seriously influenced.
In order to realize the integral one-step molding without secondary bonding, the most important obstacle is that along with the increase of the content of the glass fiber, the conventional production processes such as manual kneading or mechanical simulation manual impregnation device and the like are adopted, the impregnation process is very difficult or even impossible to implement, and the impregnation effect of the resin and the fiber is poor.
SUMMERY OF THE UTILITY MODEL
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
In order to solve the problems that the bonding forming of the synthetic sleeper is complex in process and difficult to control the bonding quality, the bonding surface is cracked and the product is invalid in actual use, and the driving safety is seriously influenced, the application discloses a non-layered bonding once-forming synthetic sleeper and a manufacturing method thereof.
This application adopts the mode that increases the sleeper core, controls the glass fiber quantity that needs the flooding in the flooding stage to avoid rubbing the inequality, can realize again that the dull and stereotyped bonding of non-secondary and once big thickness is whole shaping, and product cross section fibre content and product density are steerable within the required scope.
In the present application, the curing refers to heating, foaming, curing and shaping treatment (thermosetting reaction) of the mixture of the fiber and the resin by using a laminating conveying device;
in this application, the impregnation refers to the mixing of the fibers with the resin, so that the resin completely soaks the fibers;
the application discloses a sleeper, which comprises a sleeper core material and a sleeper base material, wherein the sleeper core material is positioned in a position where a spike is installed in the sleeper, and the sleeper core material is positioned in the sleeper base material;
the length of the sleeper core material is the same as that of the sleeper and is parallel to the sleeper; the density of the sleeper core material is greater than or equal to that of the sleeper;
the sleeper core material comprises first fibers and first resin, the sleeper base material comprises second fibers and second resin, and the arrangement direction of the first fibers and the second fibers is parallel to the length direction of the sleeper.
In one embodiment disclosed herein, the density ratio of the tie core to the tie is (1 to 3): 1.
In one embodiment disclosed herein, the volume ratio of the tie core to the tie is (0.8 to 0.2): 1;
in one embodiment disclosed herein, the sleeper core is any one of a polygonal prism, a pyramid, or a truncated cone; preferably, the sleeper core material comprises a hollow structure penetrating in the direction of elongation;
in one embodiment disclosed herein, the sleeper core surface is provided with grooves, protrusions, raised lines or spirals.
In one embodiment disclosed herein, the number of the tie core materials may be 1 or more.
In one embodiment disclosed herein, the tie cores are distributed in the body in a desired number and location. The location is generally at the spike mounting location for better nail grip of the tie.
In one embodiment disclosed herein, the raw material of the sleeper core further comprises reinforcing fibers;
in one embodiment disclosed herein, the weight ratio of the reinforcing fibers, the first fibers, and the first resin is (0.05 to 0.10): (0.40 to 0.60);
in one embodiment disclosed herein, the sleeper substrate further includes reinforcing fibers, preferably, the weight ratio of the reinforcing fibers, the second fibers and the second resin is (0.05 to 0.10): (0.40 to 0.60).
In one embodiment disclosed herein, the reinforcing fibers are selected from any one or more of chopped fibers and fiber fabrics;
in one embodiment of the present disclosure, the material of the reinforcing fiber is any one or more of glass fiber, basalt fiber, carbon fiber, and boron fiber.
In one embodiment of the present disclosure, the first fibers and the second fibers are arranged in a direction parallel to the length direction of the sleeper, and the first fibers and the second fibers have the same length as the sleeper.
In one embodiment disclosed herein, the first fibers and the second fibers are selected from any one or more of glass fibers, carbon fibers, basalt fibers, and boron fibers.
In one embodiment disclosed herein, the first and second resins are selected from any one or more of vinyl ester resins, epoxy resins, phenolic resins, and polyurethane resins.
In another aspect, the present application provides a method for manufacturing the sleeper, including the following steps:
1) preparing a sleeper core material by taking the first fibers, the first resin and the reinforcing fibers;
2) impregnating the sleeper core material and the second fibers in the second resin after the sleeper core material and the second fibers are arranged according to the design, so that the surfaces of the sleeper core material and the second fibers are covered by the second resin;
3) conveying the material obtained in the step 2) to a curing device, and curing and forming to obtain the sleeper. Alternatively, the preparation method consists of the steps described above.
In one embodiment disclosed by the application, the sleeper core material is arranged in a preset manner, the second fibers and the second resin are impregnated, and the sleeper core material and the second fibers and the second resin enter a cavity together according to a certain arrangement, and are subjected to pultrusion, curing and molding; cutting according to the length, and carrying out post-processing and treatment. Partial post-processing or treatment work may also be performed prior to cutting.
In one embodiment disclosed herein, the method for preparing the sleeper core material comprises the following steps:
a) impregnating the first fibers and the reinforcing fibers in the first resin after arranging the first fibers and the reinforcing fibers according to the design, so that the surfaces of the first fibers and the reinforcing fibers are covered by the first resin;
b) simultaneously conveying the first fibers and the reinforcing fibers obtained in the step a) and the first resin to a curing device, and curing and molding to obtain the sleeper core material.
The sleeper core material is relatively simple in impregnation process, the fiber content can be consistent with the body, and can be far higher than the synthetic sleeper body.
This application adopts the mode that increases the combined material strengthening rib, has reduced the fibre quantity that the flooding stage needs the flooding to avoid rubbing the inequality, realized non-secondary flat board bonding and one shot forming, and product cross section fibre content and product density are steerable within the required scope, can also carry out serialization production.
The produced non-secondary flat plate is bonded and integrally formed into the sleeper in one step, the bonding link is not needed, the processing efficiency is improved, and the problems that the bonding surface is cracked, the product is invalid and the driving safety is seriously influenced are solved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and methods described in the specification.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic illustration of the production of a prior art composite tie.
Fig. 2 is a schematic illustration of prior art composite tie bonding.
Fig. 3 is a schematic diagram of a sleeper core structure.
Fig. 4 is a schematic view of a non-laminated bonded one-shot composite tie.
FIG. 5 is a schematic view of fiber, sleeper core impregnation.
Fig. 6 is a schematic illustration of the production of a non-laminated bonded one-shot composite tie.
Fig. 7 is a cross-sectional schematic view of a non-laminated bonded one shot synthetic sleeper.
Fig. 8 is a schematic illustration of a composite tie application.
In the figure, 1, a creel, 2, continuous fibers, 3, a pouring mixed infiltration area, 4, a laminating machine, 5, a sawing machine, 6, a sleeper substrate, 7, a sleeper bonding layer, 8, a bonding and fixing device, 9, a sleeper core material, 9-1, a first sleeper core material, 9-2, a second sleeper core material, 9-3, a third sleeper core material, 10, a steel rail, 11, a spring buckle pressing strip, 12, a rail nail, 13 and a fastener plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application discloses a sleeper, which comprises a sleeper core material and a sleeper base material, wherein the sleeper core material is positioned in a position where a spike is installed in the sleeper, and the sleeper core material is positioned in the sleeper base material;
the length of the sleeper core material is the same as that of the sleeper and is parallel to the sleeper; the density of the sleeper core material is greater than or equal to that of the sleeper;
the sleeper core material comprises first fibers and first resin, the sleeper base material comprises second fibers and second resin, and the arrangement direction of the first fibers and the second fibers is parallel to the length direction of the sleeper.
In the examples of the present application, the density ratio of the tie core to the tie is (1 to 3): 1.
In the embodiments of the present application, the volume ratio of the tie core material to the tie is (0.8 to 0.2): 1;
in the embodiment of the application, the sleeper core material is any one of a polygonal prism, a cone or a circular truncated cone; preferably, the sleeper core material comprises a hollow structure penetrating in the direction of elongation;
in the embodiment of the application, the surface of the sleeper core material is provided with grooves, bulges, concave-convex lines or spirals.
In the embodiment of the present application, the number of the tie core materials may be 1 or more.
In the embodiments of the present application, the tie cores are distributed in the body in the desired number and location. The location is generally at the spike mounting location for better nail grip of the tie.
In the embodiment of the application, the raw material of the sleeper core material further comprises reinforcing fibers;
in the present embodiment, the weight ratio of the reinforcing fibers, the first fibers and the first resin is (0.05 to 0.10): (0.40 to 0.60);
in the embodiment of the application, the sleeper base material further comprises reinforcing fibers, and preferably, the weight ratio of the reinforcing fibers, the second fibers and the second resin is (0.05-0.10): (0.40-0.60): (0.40-0.60).
In embodiments herein, the reinforcing fibers are selected from any one or more of chopped fibers and fiber fabrics;
in an embodiment of the present application, the reinforcing fibers are made of any one or more of glass fiber, basalt fiber, carbon fiber, and boron fiber.
In the embodiment of the application, the arrangement direction of the first fibers and the second fibers is parallel to the length direction of the sleeper, and the lengths of the first fibers and the second fibers are the same as the sleeper.
In an embodiment of the present application, the first fibers and the second fibers are selected from any one or more of glass fibers, carbon fibers, basalt fibers, and boron fibers.
In embodiments herein, the first and second resins are selected from any one or more of vinyl ester resins, epoxy resins, phenolic resins, and polyurethane resins.
The embodiment of the application also provides a preparation method of the sleeper, which comprises the following steps:
1) preparing a sleeper core material by taking the first fibers, the first resin and the reinforcing fibers;
2) impregnating the sleeper core material and the second fibers in the second resin after the sleeper core material and the second fibers are arranged according to the design, so that the surfaces of the sleeper core material and the second fibers are covered by the second resin;
3) conveying the material obtained in the step 2) to a curing device, and curing and forming to obtain the sleeper. Alternatively, the preparation method consists of the steps described above.
In the embodiment of the application, the sleeper core material is arranged in a preset way, the second fibers and the second resin are impregnated, and the sleeper core material and the second fibers and the second resin enter a cavity together according to a certain arrangement and are subjected to pultrusion and curing molding; cutting according to the length, and carrying out post-processing and treatment. Partial post-processing or treatment work may also be performed prior to cutting.
In an embodiment of the application, the preparation method of the sleeper core material comprises the following steps:
a) impregnating the first fibers and the reinforcing fibers in the first resin after arranging the first fibers and the reinforcing fibers according to the design, so that the surfaces of the first fibers and the reinforcing fibers are covered by the first resin;
b) simultaneously conveying the first fibers and the reinforcing fibers obtained in the step a) and the first resin to a curing device, and curing and molding to obtain the sleeper core material.
The creel 1 is used for distributing and dividing yarns, and the continuous fibers 2 can be pre-distributed and arranged according to the density distribution condition of the sleeper. The creel 1 corresponds to a cross section of the sleeper of enlarged dimensions, the hole distribution of the creel 1 being the same as the distribution of the fibres in the sleeper. In contrast, in order to facilitate the laying of the fibre tows during the manufacturing process, the distance between the fibre holes in the creel 1 is greater than the actual distance of the fibre tows in the sleeper. Depending on the production line differences, the distance between the fibre holes in the creel 1 is typically about 5-20 times the actual distance of the fibre bundles in the sleepers. If the distance between two adjacent bundles in the sleeper can be 3mm, the distance between the corresponding fibre holes on creel 1 is 15mm-60mm (obtained from 3mm x (5-20 times)). In production, after the second fiber content is determined, the fiber content of the fibers on the creel 1 can be calculated according to the multiple of the distance between the fiber holes on the creel 1 and the actual distance of the fiber bundles in the sleeper.
Moreover, the sleeper core material has certain rigidity and stiffness, and is easier to arrange through the guiding and positioning device, so that the sleeper is uniform inside, or is easy to arrange according to a preset area.
The structure is similar to a reinforced concrete structure, and is formed at a curing stage in one step, the performance, the number and the position arrangement of the 'reinforcing steel bar' can be designed, the performance is stable, and the integrity is good. But also can continuously produce with high production efficiency.
Example 1
Embodiments of the present invention will be described with reference to the accompanying drawings.
In this example, the dimensions of the sleeper are 230mm wide by 140mm high by 4.5m long and 800kg/m density3The first fiber is glass fiber and is purchased from Chongqing International corporation under the mark of ECT467 HT; the first resin was a polyurethane resin available from henseme, inc, under the 5005 designation; the second fiber is glass fiber, available from owens corning, PS 4100; the second resin is polyurethane available from Wanhua company under the PM200 brand;
the sleeper core material is prepared from first fibers and first resin, the sleeper core material is cuboid, the size of the sleeper core material is 100mm in width and 50mm in height, the density ratio of the sleeper core material to a sleeper is 1:1, the volume ratio of the sleeper core material to the sleeper is 1:3.22, the number of the sleeper core material is 2, the length of the sleeper core material is equal to that of the sleeper and is arranged in parallel, the arrangement mode of the sleeper core material in the sleeper is that the sleeper core material is arranged at the position where a composite sleeper rail nail is installed, and grooves are formed in the surface of the sleeper core material (the grooves are rectangular, the width of the grooves is 10mm, the depth of the grooves is 2mm, and the grooves are uniformly distributed in the surface of the sleeper core material). The weight ratio of the first fibers to the first resin in the sleeper core material is 1:1 (the first fiber specification is 9600tex, and the required number is 210). The direction of the first fibers in the sleeper core material is parallel to the length direction of the sleeper core material.
The sleeper core material is prepared by impregnating the first fibers in the first resin after the first fibers are arranged according to a design (uniformly distributed in the sleeper core material), so that the surfaces of the first fibers and the first reinforcing fibers are covered by the first resin; and then conveying the obtained first fibers and the first reinforcing fibers and the first resin to curing equipment simultaneously, and curing and molding to obtain the sleeper core material.
The second fibers have a linear density of 9600 tex.
In this embodiment, the non-layered bonded one-step molded composite sleeper and the manufacturing method thereof specifically operate as follows:
based on the specification, the number and the arrangement of sleeper core materials (the number of the sleeper core materials is 2, the length of the rail pillow core materials is equal to that of a sleeper, the sleeper core materials are arranged in parallel, the arrangement mode of the sleeper core materials in the sleeper is the installation position of a synthetic sleeper spike), and then the use amounts of the second fibers and the second resin are determined (the weight ratio of the second fibers to the second resin is 1: 1). During production, the raw materials are arranged according to the preset, the sleeper core material, the second fiber and the second resin are impregnated, the surfaces of the sleeper core material and the second fiber are covered by the second resin, then the raw materials are arranged according to the proportion and the preset arrangement and enter a curing machine cavity together, and continuous pultrusion curing molding or die pressing curing molding is adopted.
The synthetic sleeper is shown in fig. 4, the sleeper adopts a mode of increasing sleeper core materials as reinforcing ribs, the number of second fibers needing to be impregnated in an impregnation stage is reduced, the actual number of the second fibers is only 925, the number of the fibers can be reduced by 420 under the same density, the infiltration difficulty of the fibers during forming is reduced, so that the rubbing is avoided, the non-secondary flat plate bonding and one-time integral forming are realized, the fiber content of the cross section of a product and the density of the product can be controlled within a required range, and the continuous production can be carried out.
TABLE 1
| Bulk density/(g/cm)3) | Content of yarn% | Test results/kN |
| 0.784 | 0.513 | 63.5 |
According to the standard of Chinese building material industry standard CJ/T399-2012 polyurethane foam synthetic sleeper, the appearance quality of the sleeper, the bending load resistance and the fatigue performance of the measured sleeper are shown in Table 2:
table 2 other performance data
| Quality of sleeper appearance | Bending load resistance of finished product | Fatigue performance |
| No abnormality | ≥ |
105No abnormality |
Example 2
In this example, the dimensions of the sleeper are 230mm wide by 140mm high by 4.5m long, and the density of the sleeper is 800kg/m3The first fiber is glass fiber and is purchased from Chongqing International corporation under the mark of ECT467 HT; the first resin was a polyurethane resin available from henseme, inc, under the 5005 designation; the second fiber is glass fiber, available from owens corning, PS 4100; the second resin is polyurethane available from Wanhua company under the PM200 brand; the sleeper core material is prepared from first fibers and first resin, the sleeper core material is cuboid, the size of the sleeper core material is 100mm in width and 50mm in height, the density ratio of the sleeper core material to a sleeper is 1:0.8, the volume ratio of the sleeper core material to the sleeper is 1:3.22, the number of the sleeper core material is 2, the length of the sleeper core material is equal to that of the sleeper and is arranged in parallel, the arrangement mode of the sleeper core material in the sleeper is that the sleeper core material is arranged at the position where a composite sleeper rail nail is installed, and grooves are formed in the surface of the sleeper core material (the grooves in the surface of the sleeper core material are formed in a mechanical preprocessing mode, the cross section of the grooves is rectangular and penetrates through the length direction of the sleeper core material, the width of the grooves is 10mm, the depth of the grooves is 2mm, and the grooves are uniformly distributed on the surface of the sleeper core material). The weight ratio of the first fibers, the first resin and the first reinforcing fibers in the sleeper core material is 6: 4. The direction of the first fibers in the sleeper core material is parallel to the length direction of the sleeper core material.
The sleeper core material is prepared by impregnating the first fibers in the first resin after arranging the first fibers according to a design (the uniform arrangement of 312 first fibers is 100mm wide by 50mm high), so that the surfaces of the first fibers and the first reinforcing fibers are covered by the first resin; and then conveying the obtained first fibers and the first reinforcing fibers and the first resin to curing equipment simultaneously, and curing and molding to obtain the sleeper core material.
The second fibers have a linear density of 9600 tex;
in this embodiment, the non-layered bonded one-step molded composite sleeper and the manufacturing method thereof specifically operate as follows:
based on the specification, the number and the arrangement of sleeper core materials (the number of the sleeper core materials is 2, the length of the rail pillow core materials is equal to that of a sleeper, the sleeper core materials are arranged in parallel, the arrangement mode of the sleeper core materials in the sleeper is the installation position of a synthetic sleeper spike), and then the use amounts of the second fibers and the second resin are determined (the weight use amount ratio of the second fibers to the second resin is 1: 1). During production, the raw materials are arranged according to the preset, the sleeper core material, the second fiber and the second resin are impregnated, the surfaces of the sleeper core material and the second fiber are covered by the second resin, then the raw materials are arranged according to the proportion and the preset arrangement and enter a curing machine cavity together, and continuous pultrusion curing molding or die pressing curing molding is adopted.
3) The composite sleeper is shown in FIG. 8, with an actual second fiber count of 820 (example 2 composite sleeper overall density of 800 kg/m)3Wherein the density of the sleeper core material is 1000kg/m3According to the section proportion and the density of the sleeper core material, the density of the sleeper core material except the sleeper core material is calculated to be 710kg/m3). The sleeper nail fastening position is a position where the synthetic sleeper is embedded into a high-performance sleeper core material, and the synthetic sleeper mainly has the functions of bearing the pressure of a steel rail and connecting the steel rail with a fastener to fix the steel rail, so that the firmness of the synthetic sleeper to the connecting fastener, namely the nail holding force of the sleeper nail is a very important performance index.
TABLE 3
| Sampling area | Density/(g/cm)3) | Content of yarn% | Test results/kN |
| Sleeper core area | 0.986 | 0.615 | 75.6 |
| Other regions | 0.783 | 0.509 | 54.8 |
According to the standard of Chinese building material industry standard CJ/T399-2012 polyurethane foam synthetic sleeper, the appearance quality of the sleeper, the bending load resistance and the fatigue performance of the measured sleeper are shown in Table 4:
table 4 other Performance data
| Quality of sleeper appearance | Bending load resistance of finished product | Fatigue performance |
| No abnormality | ≥ |
105No abnormality |
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (5)
1. A sleeper is characterized by comprising a sleeper core material and a sleeper base material, wherein the sleeper core material is positioned in the sleeper at the position where a railway spike is installed, and the sleeper core material is positioned in the sleeper base material;
the length of the sleeper core material is the same as that of the sleeper and is parallel to the sleeper; the density of the sleeper core material is greater than or equal to that of the sleeper;
the sleeper core material comprises first fibers, the sleeper base material comprises second fibers, and the arrangement direction of the first fibers and the arrangement direction of the second fibers are parallel to the length direction of the sleeper.
2. The tie as claimed in claim 1 wherein the density ratio of said tie core to said tie is (1 to 3): 1.
3. The tie as claimed in claim 1 wherein the volume ratio of said tie core to said tie is (0.8 to 0.2): 1.
4. The tie as claimed in claim 1 wherein said tie core is a polygonal prism.
5. The tie as claimed in claim 1 wherein said tie core surface is provided with grooves or protrusions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023296250.4U CN216032648U (en) | 2020-12-31 | 2020-12-31 | Sleeper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023296250.4U CN216032648U (en) | 2020-12-31 | 2020-12-31 | Sleeper |
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| Publication Number | Publication Date |
|---|---|
| CN216032648U true CN216032648U (en) | 2022-03-15 |
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| CN202023296250.4U Active CN216032648U (en) | 2020-12-31 | 2020-12-31 | Sleeper |
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