CN112186670A - Cable testing bridge convenient to cable laying - Google Patents
Cable testing bridge convenient to cable laying Download PDFInfo
- Publication number
- CN112186670A CN112186670A CN202011102921.0A CN202011102921A CN112186670A CN 112186670 A CN112186670 A CN 112186670A CN 202011102921 A CN202011102921 A CN 202011102921A CN 112186670 A CN112186670 A CN 112186670A
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- Prior art keywords
- cable
- laying
- corner
- roller assembly
- vertical roller
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0406—Details thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0437—Channels
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a cable bridge convenient for cable laying, which belongs to the technical field of cable laying and comprises a linear part and a corner part, wherein the bottom of the linear part is provided with a horizontal roller assembly, the horizontal roller assembly comprises a horizontal roller, and the upper part of the horizontal roller protrudes out of the bottom surface of a channel of the linear part; a vertical roller assembly is arranged at the inner corner of the corner passage; the vertical roller assembly comprises a vertical roller, and the circumferential surface of the vertical roller protrudes out of the inner side surface of the channel of the corner part adjacent to the vertical roller assembly. The cable is supported and guided in a rolling way through the horizontal rollers on the horizontal roller assemblies in the linear part, and the cable is supported in a turning way and guided in a rolling way through the vertical rollers of the vertical roller assemblies in the inner corners of the corner parts, so that the friction force between the cable and the wall of the cable bridge channel can be greatly reduced, the dragging of construction operators is facilitated, the risk of abrasion of the cable in the cable bridge is reduced, and the safety is high; the construction efficiency of cable diversion laying is greatly improved, and labor cost is saved.
Description
Technical Field
The invention belongs to the technical field of cable laying, and particularly relates to a cable bridge convenient for cable laying.
Background
The cable bridge is a structural device for laying and wiring cables, is usually hung on buildings and pipe rack supports, has the characteristics of simple structure, easiness in construction, flexibility in configuration, convenience in maintenance and the like, and is widely applied to various wiring occasions.
Due to the increase of cell supporting projects in recent years, the frequency of laying cables in cable bridges such as underground parking lots is higher and higher, when the cables of the cable bridges are laid, the cables need to be dragged in the cable bridges, generally, due to the fact that cable wiring is long, the cables have large friction force with cable bridge channels, dragging is difficult, the risk of abrasion of cable sheaths is increased, and potential safety hazards exist; especially, the corner can't be directly dragged, greatly reduced efficiency of construction wastes time and energy.
Disclosure of Invention
The cable bridge aims to solve the problems that when the existing cable is laid, the cable needs to be dragged in a cable bridge, the cable and a cable bridge channel have large friction force and are difficult to drag, the risk of abrasion of a cable sheath is increased, and potential safety hazards exist; particularly, the corners can not be directly dragged, so that the construction efficiency is greatly reduced, and the problems of time and labor waste are solved.
The invention is realized by the following technical scheme.
A cable bridge convenient for cable laying comprises a straight line part and a corner part of a U-shaped channel section, wherein a horizontal roller assembly is installed at the bottom of the straight line part, the horizontal roller assembly comprises a horizontal roller, and the upper part of the horizontal roller protrudes out of the bottom surface of the straight line part channel; a vertical roller assembly is arranged at the inner corner of the corner part channel; the vertical roller assembly comprises a vertical roller, and the circumferential surface of the vertical roller protrudes out of the inner side surface of a corner part channel adjacent to the vertical roller assembly.
The invention is further improved, the horizontal roller assembly comprises a shell I connected with the bottom of the linear part, and the horizontal roller is horizontally and rotatably arranged in the shell I; the bottom of the straight line part is provided with a notch, and the upper part of the horizontal roller protrudes out of the bottom surface of the straight line part channel through the notch.
According to further improvement of the invention, clamping strips are arranged on two sides of the shell I, and a limiting plate clamped with the clamping strips is arranged at the bottom of the straight line part.
In a further improvement of the present invention, the housing i has a rectangular housing structure with an open upper portion.
The invention further improves the structure and also comprises a sealing plate which is detachably clamped with the limiting plate.
The invention is further improved that a gap is arranged at the inner corner of the corner part, and a vertical guard plate is arranged outside the gap; the vertical roller assembly comprises a shell II which is clamped between the protection plate and the side wall of the corner part in a sliding mode, and the vertical roller is vertically and rotatably installed inside the shell II.
The invention further improves that the shell II comprises a bottom plate and supporting plates which are arranged at two ends and are in right triangle shapes.
The invention is further improved, the straight line part and the corner part, and the adjacent straight line parts are in supporting connection through a connecting bracket; the bottom of the connecting bracket is screwed with a fastening screw, and the upper part of the connecting bracket is connected with a suspension rod.
In a further development of the invention, the connecting bracket is U-shaped in cross-section.
The invention is further improved in that the horizontal roller and the vertical roller are both in a shape of a structure with a thin middle part and thick two ends.
According to the technical scheme, the invention has the beneficial effects that: 1. the cable is supported and guided in a rolling way through the horizontal rollers on the horizontal roller assemblies in the linear part, and the cable is supported in a turning way and guided in a rolling way through the vertical rollers of the vertical roller assemblies in the inner corners of the corner parts, so that the friction force between the cable and the wall of the cable bridge channel can be greatly reduced, the dragging of construction operators is facilitated, the risk of abrasion of the cable in the cable bridge is reduced, and the safety is high; the construction efficiency of cable diversion laying is greatly improved, and labor cost is saved. 2. Casing I and notch bottom are outer along being connected the installation, and the bottom surface of notch slightly protrusion in sharp portion passageway is passed through to horizontal gyro wheel upper portion, can guarantee to the roll support direction of cable, can guarantee again that the cable tip is crossed horizontal gyro wheel smoothly, prevents that the cable card from going into in the notch gap. 3. Through card strip and limiting plate demountable installation, realize the convenient dismouting of horizontal roller assembly, can reduce the whole weight of cable testing bridge after the cabling is accomplished to can be to horizontal roller assembly used repeatedly, resource utilization is high, saves the cost. 4. Casing I can seal the notch bottom, and simple structure easily realizes. 5. After laying, the closing plate seals up the notch, prevents that the cable from dropping, and the security is good. 6. The vertical roller component is detachably and slidably mounted at the inner corner of the corner part, and supports, rolls and changes direction and guides the cable through the vertical roller. 7. The vertical roller wheel assemblies are stably and firmly clamped, can slide in and out from the upper parts of the corners, can be conveniently disassembled and assembled, can reduce the whole weight of a cable bridge after the cable is laid, can be repeatedly used, is high in resource utilization rate and saves cost. 8. Two ports of the corner part are connected with the linear parts through connecting brackets, and the adjacent linear parts are also connected through the connecting brackets and are limited and fixed through fastening screws so as to prevent the two linear parts from falling; hang through the suspension rod and hoist on building and piping lane support, holistic cable testing bridge construction structural stability is good. 9. The connecting bracket is tightly attached to the outer side surfaces of the two adjacent ports, so that the bearing and connecting effect is better, and the connection is stable and firm. 10. The cable is guided to the middle of the roller in a concentrated mode as far as possible, the cable is prevented from being extruded into an inner gap, concentrated dragging can be facilitated, and the practicability is good.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic top view of the structure of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a corner structure in embodiment 1 of the present invention.
Fig. 3 is a schematic view of the structure of the linear portion of the present invention.
Fig. 4 is a schematic view of the connection structure of adjacent straight line parts according to the present invention.
Fig. 5 is a schematic view of a connection structure between a straight portion and a corner portion according to the present invention.
FIG. 6 is a schematic view of the seal plate to slot seal structure of the present invention.
Fig. 7 is a schematic view of the sealing plate structure of the present invention.
Fig. 8 is a schematic view of the vertical roller assembly mounting structure of the present invention.
Fig. 9 is a schematic structural view of the vertical roller assembly of the present invention.
Fig. 10 is a schematic structural view of the horizontal roller assembly of the present invention.
Fig. 11 is a schematic top view of embodiment 2 of the present invention.
Fig. 12 is a schematic diagram of a corner structure in embodiment 2 of the present invention.
Fig. 13 is a schematic top view of embodiment 3 of the present invention.
Fig. 14 is a schematic diagram of a corner structure in embodiment 3 of the present invention.
In the drawings: 1. the connecting device comprises a straight line part, a corner part, a connecting bracket, a horizontal roller assembly, a shell I, a shell 42, a horizontal roller, a 43, a notch, a 5, a vertical roller assembly, a 51, a shell II, a 52, a vertical roller, a 53, a protective plate, a 6, a limiting plate, a 7, a clamping strip, a 8, a fastening screw, a 9, a suspension rod, a 10 and a sealing plate.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
Example 1
1-10, a cable bridge for facilitating cable laying comprises a straight part 1 with a U-shaped channel section and an L-shaped corner part 2, wherein a horizontal roller assembly 4 is detachably mounted at the bottom of the straight part 1, the horizontal roller assembly 4 comprises a horizontal roller 42 vertical to the channel direction of the straight part 1, and the upper part of the horizontal roller 42 protrudes out of the bottom surface of the channel of the straight part 1; a vertical roller assembly 5 is arranged at the inner corner of the channel of the corner part 2; the vertical roller assembly 5 includes a vertical roller 52, and the circumferential surface of the vertical roller 52 protrudes from the inner side surface of the channel of the adjacent corner 2 of the vertical roller assembly 5.
The cable is laid in a right-angle turning mode, an L-shaped corner part 2 is adopted, and two ports of the L-shaped corner part are respectively in butt joint with a straight line part 1, so that the cable is laid in a turning mode; the cable is supported and guided in a rolling way through the horizontal roller 42 on the horizontal roller component 4 in the straight line part 1, and the cable is supported in a turning way and guided in a rolling way through the vertical roller 52 of the vertical roller component 5 in the inner corner part 2, so that the friction force between the cable and the wall of the cable bridge channel can be greatly reduced, the dragging of construction operation personnel is facilitated, the risk of abrasion of the cable in the cable bridge is reduced, and the safety is high; the construction efficiency of cable diversion laying is greatly improved, and labor cost is saved.
The vertical roller 52 with different curvatures can be selected according to the bending performance of different cables, so as to ensure the safety of cable laying.
The horizontal roller assembly 4 comprises a shell I41 connected with the bottom of the linear part 1, and the horizontal roller 42 is horizontally and rotatably arranged in the shell I41; the bottom of the channel of the linear part 1 is provided with a notch 43, and the upper part of the horizontal roller 42 protrudes out of the bottom surface of the channel of the linear part 1 through the notch 43. The casing I41 is connected with the outer edge of notch 43 bottom and is installed, and horizontal gyro wheel 42 upper portion passes through notch 43 and slightly protrudes in the bottom surface of 1 passageway of straight line portion, can guarantee the roll support direction to the cable, can guarantee again that the cable tip is crossed horizontal gyro wheel 42 smoothly, prevents that the cable card from going into in notch 43 gap, simple structure, the practicality is good.
The two sides of the shell I41 are provided with clamping strips 7, and the bottom of the straight line part 1 is provided with a limiting plate 6 clamped with the clamping strips 7. The bottom of the limiting plate 6 is provided with an inward bent barb, and the bottom surface of the limiting plate is an inward upward inclined surface; the upper surface of the clamping strip 7 is an inclined surface which faces outwards and downwards. Through card strip 7 and limiting plate 6 demountable installation, realize the convenient dismouting of horizontal roller assembly 4, can reduce the whole weight of cable testing bridge after the cabling is accomplished to can be to horizontal roller assembly 4 used repeatedly, resource utilization is high, saves the cost. The horizontal roller assembly 4 is convenient to disassemble and assemble, the two inclined planes are mutually matched, the sliding card is convenient to clamp, the structure is simple, and the realization is easy.
As shown in fig. 10, the housing i 41 has a rectangular housing structure with an open upper portion. The bottom of the notch 43 can be sealed, and the structure is simple and easy to realize.
After the laying is finished, the horizontal roller assembly 4 is detached, and the sealing plate 10 is inserted between the two limiting plates 6 to seal the notch 43, so that the cable is prevented from falling off, and the safety is good; the sealing plate 10 is characterized in that a limiting portion is arranged at one end of the sealing plate 10, a chamfer is formed in the bottom of the other end of the sealing plate, the limiting portion limits the insertion of the sealing plate 10 in an inserting mode, tight sealing and accurate insertion are guaranteed, the chamfer is arranged to be more beneficial to the insertion guiding of the sealing plate 10, and the practicability is good.
A gap is formed at the inner corner of the corner part 2, and a vertical guard plate 53 is fixedly connected to the outer side of the gap; the vertical roller assembly 5 comprises a shell II 51 which is vertically slidably clamped between the guard plate 53 and the side wall of the corner part 2, and the vertical roller 52 is vertically and rotatably installed inside the shell II 51. The vertical roller assembly 5 is detachably and slidably mounted at the inner corner of the corner part 2, and the cable is supported, rolled, turned and guided by the vertical roller 52, so that the structure is simple and the realization is easy.
As shown in fig. 8 and 9, the case ii 51 includes a bottom plate and support plates having right triangle-shaped ends, the bottom plate is engaged with the inner side surface of the guard plate 53, the support plates are engaged with the side walls of the corner portion 2, and the support plates at the bottom are supported by the bottom surface of the corner portion 2. The vertical roller wheel assemblies 5 are stably and firmly clamped, the vertical roller wheel assemblies 5 can slide in and out from the upper portions of the corners, the vertical roller wheel assemblies 5 are convenient to disassemble and assemble, the overall weight of a cable bridge frame after cable laying is finished can be reduced, the vertical roller wheel assemblies 5 can be repeatedly used, the resource utilization rate is high, and the cost is saved.
The straight line parts 1 and the corner parts 2 and the adjacent straight line parts 1 are in supporting connection through connecting brackets 3; the bottom of the connecting bracket 3 is screwed with a fastening screw 8, and the upper part of the connecting bracket 3 is connected with a suspension rod 9. Two ports of the corner part 2 are connected with the linear parts 1 through connecting brackets 3, the adjacent linear parts 1 are also connected through the connecting brackets 3, and the two linear parts are limited and fixed through fastening screws 8 to prevent falling; hang through the suspension pole 9 and hoist on building and piping lane support, holistic cable testing bridge construction structural stability is good.
The cross section of the connecting bracket 3 is U-shaped. The outer side surfaces of the two adjacent ports are tightly attached, the bearing and connecting effect is better, and the connection is stable and firm.
The horizontal roller 42 and the vertical roller 52 are both in the shape of a structure with a thin middle part and thick two ends. The cable is guided to the middle of the roller in a concentrated mode as far as possible, the cable is prevented from being extruded into an inner gap, concentrated dragging can be facilitated, and the practicability is good.
Example 2
As shown in fig. 11 and 12, the present embodiment is different from embodiment 1 in that: the corner part 2 is T-shaped and is provided with three passage openings, and vertical roller assemblies 5 are symmetrically arranged at two corners. According to the working condition of laying the cable, the shunting and turning guide of the cable is realized, and the application range is wide.
Example 3
As shown in fig. 13 and 14, the present embodiment is different from embodiment 1 in that: the corner part 2 is cross-shaped and is provided with four passage openings, and vertical roller assemblies 5 are arranged at the four inner corners. According to the working condition of laying the cable, the shunting and turning guide of the cable is realized, and the application range is wide.
The cable bridge convenient for cable laying has the advantages of simple structure and flexible use, and the straight line part can be freely and flexibly matched and installed with the corner parts of the three structural forms; the cable is supported and guided in a rolling way through the horizontal rollers on the horizontal roller assemblies in the linear part, and the cable is supported in a turning way and guided in a rolling way through the vertical rollers of the vertical roller assemblies in the inner corners of the corner parts, so that the friction force between the cable and the wall of the cable bridge channel can be greatly reduced, the dragging of construction operators is facilitated, the risk of abrasion of the cable in the cable bridge is reduced, and the safety is high; the construction efficiency of cable diversion laying is greatly improved, and labor cost is saved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative positions if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A cable bridge convenient for cable laying is characterized by comprising a straight part (1) and a corner part (2) with U-shaped channel sections, wherein a horizontal roller assembly (4) is installed at the bottom of the straight part (1), the horizontal roller assembly (4) comprises a horizontal roller (42), and the upper part of the horizontal roller (42) protrudes out of the bottom surface of a channel of the straight part (1); a vertical roller assembly (5) is arranged at the inner corner of the channel of the corner part (2); the vertical roller assembly (5) comprises a vertical roller (52), and the circumferential surface of the vertical roller (52) protrudes out of the inner side surface of a channel of the adjacent corner part (2) of the vertical roller assembly (5).
2. The cable tray for facilitating cable laying according to claim 1, wherein the horizontal roller assembly (4) comprises a housing I (41) connected to the bottom of the linear portion (1), and the horizontal roller (42) is horizontally rotatably mounted inside the housing I (41); the bottom of the straight line part (1) is provided with a notch (43), and the upper part of the horizontal roller (42) protrudes out of the bottom surface of the channel of the straight line part (1) through the notch (43).
3. The cable bridge rack convenient for cable laying according to claim 2, wherein clamping strips (7) are arranged on two sides of the shell I (41), and a limiting plate (6) clamped with the clamping strips (7) is arranged at the bottom of the straight line part (1).
4. The cable tray for facilitating cable laying as claimed in claim 2, wherein the housing i (41) has a rectangular housing structure opened at an upper portion.
5. A cable tray for facilitating the laying of cables, according to claim 3, characterized in that it comprises a sealing plate (10) removably engaged with said limiting plate (6).
6. A cable tray for facilitating the laying of cables, according to claim 1, characterized in that the inner corner of said corner (2) is notched, and outside said notch is provided with a standing shield (53); the vertical roller assembly (5) comprises a shell II (51) which is clamped between the protective plate (53) and the side wall of the corner part (2) in a sliding mode, and the vertical roller (52) is vertically installed inside the shell II (51) in a rotating mode.
7. The cable tray for facilitating the laying of cables as claimed in claim 6, characterized in that said housing II (51) comprises a bottom plate and supporting plates at both ends in the shape of right triangles.
8. Cable tray for facilitating the laying of cables, according to claim 1, characterized in that the straight portions (1) and the corner portions (2), and the adjacent straight portions (1), are in bearing connection by means of a connecting bracket (3); the bottom of the connecting bracket (3) is screwed with a fastening screw (8), and the upper part of the connecting bracket is connected with a suspension rod (9).
9. Cable tray for facilitating the laying of cables, according to claim 8, characterized in that said connection brackets (3) are U-shaped in cross-section.
10. The cable tray for facilitating cable laying as defined in claim 1, wherein said horizontal rollers (42) and vertical rollers (52) are each in the shape of a thin middle and thick two ends structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011102921.0A CN112186670A (en) | 2020-10-15 | 2020-10-15 | Cable testing bridge convenient to cable laying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011102921.0A CN112186670A (en) | 2020-10-15 | 2020-10-15 | Cable testing bridge convenient to cable laying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112186670A true CN112186670A (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011102921.0A Pending CN112186670A (en) | 2020-10-15 | 2020-10-15 | Cable testing bridge convenient to cable laying |
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| Country | Link |
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| CN (1) | CN112186670A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116971608A (en) * | 2023-07-31 | 2023-10-31 | 陕西建工第三建设集团有限公司 | Construction method of groove box installation system for overhauling horse way |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896398A (en) * | 2016-05-18 | 2016-08-24 | 中国十九冶集团有限公司 | Large-section cable laying method |
| CN208571457U (en) * | 2018-07-13 | 2019-03-01 | 贵州电网有限责任公司 | A kind of vertical right-angled corner cable laying coaster |
| CN210443961U (en) * | 2019-09-02 | 2020-05-01 | 成都市建筑设计研究院 | Cable bridge with rollers |
| CN210577549U (en) * | 2019-10-17 | 2020-05-19 | 镇江市英雄电器成套有限公司 | Cable bridge convenient to cable installation |
| CN111711131A (en) * | 2020-03-13 | 2020-09-25 | 五冶集团上海有限公司 | Cable guiding device in bridge and cable laying method |
-
2020
- 2020-10-15 CN CN202011102921.0A patent/CN112186670A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896398A (en) * | 2016-05-18 | 2016-08-24 | 中国十九冶集团有限公司 | Large-section cable laying method |
| CN208571457U (en) * | 2018-07-13 | 2019-03-01 | 贵州电网有限责任公司 | A kind of vertical right-angled corner cable laying coaster |
| CN210443961U (en) * | 2019-09-02 | 2020-05-01 | 成都市建筑设计研究院 | Cable bridge with rollers |
| CN210577549U (en) * | 2019-10-17 | 2020-05-19 | 镇江市英雄电器成套有限公司 | Cable bridge convenient to cable installation |
| CN111711131A (en) * | 2020-03-13 | 2020-09-25 | 五冶集团上海有限公司 | Cable guiding device in bridge and cable laying method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116971608A (en) * | 2023-07-31 | 2023-10-31 | 陕西建工第三建设集团有限公司 | Construction method of groove box installation system for overhauling horse way |
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Application publication date: 20210105 |