CN114220605A - Fireproof and wear-resistant cable and preparation method thereof - Google Patents
Fireproof and wear-resistant cable and preparation method thereof Download PDFInfo
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- CN114220605A CN114220605A CN202111548092.3A CN202111548092A CN114220605A CN 114220605 A CN114220605 A CN 114220605A CN 202111548092 A CN202111548092 A CN 202111548092A CN 114220605 A CN114220605 A CN 114220605A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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Abstract
The invention belongs to the technical field of cable preparation, and particularly relates to a fireproof and wear-resistant cable and a preparation method thereof. According to the invention, the side limit frame, the sliding roller and the extrusion spring are arranged, in the process that the cable body is pressed into the experiment box, the cable bodies at two ends are clamped into the side limit frame, the cable body extrudes the sliding roller, so that the extrusion spring is compressed, the reaction force of the extrusion spring drives the sliding roller to limit two ends of the cable body, and the cable body can be smoothly slid into the bottom of the experiment box.
Description
Technical Field
The invention relates to the technical field of cable preparation, in particular to a fireproof and wear-resistant cable and a preparation method thereof.
Background
Cables are generally rope-like cables made by twisting several or groups of conductors (at least two per group), each group of conductors being insulated from each other and often twisted around a center, the entire outer surface being covered with a highly insulating covering; the cable has interior circular telegram, the characteristics of external insulation, and in actual life, to some high temperatures, when the laying of cable is carried out to the comparatively complicated position of environment, it needs this cable to possess the wear-resisting characteristic of fire prevention to ensure that this cable can use for a long time, reduce its change frequency.
Present cable preparation in-process, need carry out the water pressure experiment to it, during current water pressure experiment, generally place the cable in the experimental box, then with its inside partial water of packing, extrude the water through the force (forcing) pump, realize that the cable compressive property under the different pressure detects, however, current water pressure experimental apparatus is in operation process, the cable paves in the bottom of experimental box, the water extrudees it, in the single operation process, can only obtain the cable compressive data under a water pressure, can't carry out the cable actual conditions experiment under multiple water pressure simultaneously, and simultaneously, the cable is installed probably in the condition of buckling under water, this kind of mode still can't be tested, lead to this water pressure experimental apparatus to lack use value.
Disclosure of Invention
The invention provides a preparation method of a fireproof and wear-resistant cable, which comprises the following steps:
s1: the production process comprises the steps of adding a magnesium tube into a conductor, filling, adding magnesium powder, heading, compressing, drawing, continuously annealing under gas protection, drawing (repeating) and continuously annealing under gas protection (repeating);
s2: the testing process comprises a hydrostatic test and an electric withstand voltage test;
s3: the packaging process comprises the steps of adding an outer sheath, sealing, re-inspecting and packaging;
wherein, the water pressure experimental facilities includes the experimental box, the equal fixedly connected with mount of both sides outer wall of experimental box, and the equal fixedly connected with cylinder of outer wall of two mounts, two the same regulating plate of bottom outer wall fixedly connected with of cylinder, and the bottom outer wall fixedly connected with extrusion frame of regulating plate, the inner wall equidistance fixedly connected with installation pole of extrusion frame, every the impartial distance fixedly connected with pneumatic cylinder of outer wall of installation pole, and the equal fixedly connected with of outer wall of every pneumatic cylinder supports the contact, two the outer wall of mount has all opened the perforation, and two fenestrate inner walls are pegged graft and have same cable body.
As a further scheme of the invention, the inner walls of two sides of the experimental box are fixedly connected with side limit frames, and the inner walls of the two side limit frames are provided with extrusion limit components.
As a further scheme of the invention, the extrusion limiting assembly comprises an installation frame, the inner walls of two sides of the installation frame are connected with the same connecting shaft through bearings, and the outer wall of the connecting shaft is fixedly connected with a sliding roller.
As a further scheme of the invention, the outer walls of the mounting frames are fixedly connected with extrusion springs at equal intervals, the outer wall of each mounting frame between every two adjacent extrusion springs is fixedly connected with a connecting telescopic rod, and the connecting telescopic rods and the extrusion springs are fixedly connected to the inner wall of the side limit frame.
As a further scheme of the invention, the inner walls of two sides of the experimental box are fixedly connected with the pressurizing plates, the outer walls of the bottoms of the two pressurizing plates are provided with pressurizing holes at equal distances, the outer wall of the experimental box close to the bottom end is provided with a water discharging hole, the inner wall of the water discharging hole is fixedly connected with a water discharging pipe, and the outer wall of the water discharging pipe is connected with a water valve through a flange.
As a further scheme of the invention, the outer walls of the two sides of the experimental box are fixedly connected with pump racks, the outer walls of the tops of the two pump racks are fixedly connected with pressure pumps, and the pressurizing ends of the pressure pumps are connected to the inside of the pressurizing plate through pipelines.
As a further scheme of the invention, vertical plates are fixedly connected to the outer walls of the tops of the two pressurizing plates, second hydraulic cylinders are fixedly connected to the outer walls of the opposite sides of the two vertical plates at equal distances, and the outer walls of the second hydraulic cylinders on the same vertical plate are fixedly connected with the same sealing plate.
As a further scheme of the invention, the outer walls of the two sealing plates are both provided with adaptive grooves, the outer wall of one side of one sealing plate is provided with sealing holes at equal intervals, the outer wall of the other sealing plate is fixedly connected with sealing rods at equal intervals, and the positions and the number of the sealing rods and the sealing holes are adaptive.
As a further scheme of the invention, pressure relief holes are arranged on the outer walls of the two sides of the experimental box at equal distances, the inner wall of each pressure relief hole is fixedly connected with a pressure relief pipe, and the inner wall of each pressure relief pipe is connected with an inner adjusting pipe in a sliding manner.
As a further scheme of the invention, the inner wall of the pressure relief pipe close to the opening end is fixedly connected with a limiting ring, the outer wall of the pressure relief pipe is fixedly connected with a fixing ring, the outer wall of the inner adjusting pipe is fixedly connected with an adjusting ring, the outer wall of the inner adjusting pipe close to the opening end is connected with a pressure relief valve through a flange, and the outer walls of the fixing ring and the adjusting ring on the opposite sides are fixedly connected with connecting springs at equal intervals.
The beneficial effects of the invention are as follows:
1. through the arrangement of the extrusion assembly, when the water pressure experiment operation of the cable body is carried out, the cable body penetrates through the through holes formed in the two fixing frames, then the adjusting cylinder drives the extrusion frame to extrude the cable body, in the extrusion process, the adjusting hydraulic cylinder drives the abutting head to be in contact with the cable body, then the abutting head is pressed into the bottom of the test box, so that the cable body is in contact with the inner wall of the bottom of the test box, then the hydraulic cylinder drives the abutting head to reset, the water pressure detection result error caused by the contact of the abutting head and the cable body is prevented, the cable body pressed into the test box is of a C-like structure, the cable body can be in contact with water bodies of different levels in the water pressure experiment process, the water pressures borne by all the positions are different, meanwhile, the cable body and the inner walls on the two sides of the test box are extruded to be in a bending state, and a plurality of groups of data are obtained in the single experiment process, the use value of the water pressure experimental device is improved.
2. Through being provided with the spacing frame of side, slip roller and extrusion spring, the in-process of the experimental box of impressing at this integument of cable, the cable body card that is located both ends is gone into inside the spacing frame of side, the cable body extrudees the slip roller, make the extrusion spring compressed, then the reaction force of extrusion spring drives the slip roller and prescribes a limit to the both ends of cable body, ensure its bottom that can smooth the income experimental box, and simultaneously, the cable body is at gliding in-process, the slip roller drives the connecting axle and is rotatory inside the installing frame, reduce the wearing and tearing that the cable body descends the in-process and receive, further improve the accuracy of water pressure experimental result.
3. Through being provided with the pressure release pipe, coupling spring and interior control tube, when exerting pressure to the inside water of proof box through the force pump, the inside pressure of proof box is great, then drive the outside removal of interior control tube, coupling spring is tensile, thereby prevent that the relief valve on the interior control tube from damaging because of pressure is too big to appear, and simultaneously, carrying out the pressure release in-process, with pressure release pipe and interior control tube length stretch, improve the security of pressure release in-process, ensure the security performance in this water pressure experimental apparatus use.
4. Through being provided with closing plate, sealing rod and sealed hole, bring the cable body into the bottom of experimental box through adjust cylinder after, adjust No. two pneumatic cylinders and drive the closing plate and remove for two closing plates contact, after two closing plates contact, during corresponding sealed hole was gone into to sealing rod card, further improved sealed effect, ensured the pressure pump working process, the condition that atmospheric pressure was revealed can not appear, further improved the accuracy of this water pressure experimental result.
Drawings
Fig. 1 is a schematic overall structure diagram of a fireproof and wear-resistant cable and a manufacturing method thereof according to the present invention;
FIG. 2 is a schematic diagram of an internal structure of an experimental box of a fireproof and wear-resistant cable and a preparation method thereof according to the present invention;
FIG. 3 is a schematic view of an extrusion assembly of a fireproof and abrasion-resistant cable and a method for manufacturing the same according to the present invention;
FIG. 4 is a schematic structural view of a sealing plate of a fireproof and wear-resistant cable and a method for manufacturing the same according to the present invention;
FIG. 5 is a schematic view of an internal structure of a side limiting frame of the fireproof and wear-resistant cable and the manufacturing method thereof according to the present invention;
fig. 6 is a sectional view of a structure of a pressure relief pipe of the fireproof and wear-resistant cable and the preparation method thereof.
In the figure: 1. an experimental box; 2. a water valve; 3. a drain pipe; 4. a pump frame; 5. a pressure pump; 6. a cable body; 7. a fixed mount; 8. an adjusting plate; 9. a cylinder; 10. a pressurizing hole; 11. an inner regulating tube; 12. a pressure relief pipe; 13. a side limit frame; 14. a connecting spring; 15. a pressurizing plate; 16. extruding the frame; 17. mounting a rod; 18. a hydraulic cylinder; 19. abutting against the contact; 20. a vertical plate; 21. an adaptation groove; 22. a sealing plate; 23. a second hydraulic cylinder; 24. sealing the hole; 25. a sealing rod; 26. installing a frame; 27. a connecting shaft; 28. a compression spring; 29. connecting a telescopic rod; 30. a slide roller; 31. a fixing ring; 32. an adjusting ring; 33. a pressure relief valve; 34. a limit ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-3, a preparation method of a fireproof and wear-resistant cable comprises the following steps:
s1: the production process comprises the steps of adding a magnesium tube into a conductor, filling, adding magnesium powder, heading, compressing, drawing, continuously annealing under gas protection, drawing (repeating) and continuously annealing under gas protection (repeating);
s2: the testing process comprises a hydrostatic test and an electric withstand voltage test;
s3: the packaging process comprises the steps of adding an outer sheath, sealing, re-inspecting and packaging;
wherein, the water pressure experiment equipment comprises an experiment box 1, the outer walls of two sides of the experiment box 1 are fixedly connected with fixed frames 7, the outer walls of the two fixed frames 7 are fixedly connected with air cylinders 9, the outer walls of the bottoms of the two air cylinders 9 are fixedly connected with the same adjusting plate 8, the outer walls of the bottoms of the adjusting plate 8 are fixedly connected with extrusion frames 16, the inner walls of the extrusion frames 16 are fixedly connected with installation rods 17 at equal intervals, the outer walls of each installation rod 17 are fixedly connected with hydraulic cylinders 18 at equal intervals, the outer walls of each hydraulic cylinder 18 are fixedly connected with abutting contacts 19, the outer walls of the two fixed frames 7 are provided with through holes, the inner walls of the two through holes are inserted with the same cable body 6, through arranging an extrusion assembly, when the water pressure experiment operation of the cable body is carried out, the cable body 6 passes through the through holes arranged on the two fixed frames 7, then the adjusting air cylinders 9 drive the extrusion frames 16 to extrude the cable body 6, extruded in-process, adjust pneumatic cylinder 18 and drive to contact 19 and the contact of cable body 6, then with its bottom of proof box 1 of impressing, make the contact of cable body 6 and proof box 1's bottom inner wall, then pneumatic cylinder 18 drives to contact 19 and resets, prevent to touch 19 and the contact of cable body 6 and cause its water pressure testing result mistake, the cable body 6 of being impressed proof box 1 inside presents a class C style of calligraphy structure, thereby ensure this cable body 6 in the water pressure experimentation, can contact with the water of different levels, the water pressure that its each position bore is all different, and simultaneously, the both sides inner wall extrusion of cable body 6 and proof box 1 presents crooked state, obtain multiunit data in the single experimentation, improve this water pressure experimental apparatus's use value.
Referring to fig. 1, 2 and 5, the inner walls of the two sides of the experimental box 1 are fixedly connected with side limit frames 13, and the inner walls of the two side limit frames 13 are provided with extrusion limit components.
In the invention, the extrusion limiting assembly comprises an installation frame 26, the inner walls of two sides of the installation frame 26 are connected with the same connecting shaft 27 through bearings, and the outer wall of the connecting shaft 27 is fixedly connected with a sliding roller 30.
In the invention, the outer walls of the mounting frames 26 are fixedly connected with the extrusion springs 28 at equal intervals, the outer wall of each mounting frame 26 between every two adjacent extrusion springs 28 is fixedly connected with the connecting telescopic rod 29, and the connecting telescopic rod 29 and the extrusion springs 28 are fixedly connected with the inner wall of the side limit frame 13.
Referring to fig. 1, 2 and 4, the inner walls of the two sides of the experimental box 1 are fixedly connected with the pressure plates 15, the outer walls of the bottoms of the two pressure plates 15 are provided with the pressure holes 10 at equal distances, the outer wall of the experimental box 1 close to the bottom end is provided with a drain hole, the inner wall of the drain hole is fixedly connected with a drain pipe 3, and the outer wall of the drain pipe 3 is connected with a water valve 2 through a flange.
In the invention, the outer walls of two sides of the experiment box 1 are fixedly connected with pump frames 4, the outer walls of the tops of the two pump frames 4 are fixedly connected with pressure pumps 5, and the pressurizing ends of the pressure pumps 5 are connected to the inside of a pressurizing plate 15 through pipelines.
In the invention, the outer walls of the tops of the two pressurizing plates 15 are fixedly connected with the vertical plates 20, the outer walls of the opposite sides of the two vertical plates 20 are fixedly connected with the second hydraulic cylinders 23 at equal distances, and the outer walls of the second hydraulic cylinders 23 on the same vertical plate 20 are fixedly connected with the same sealing plate 22.
In the invention, the outer walls of two sealing plates 22 are both provided with adaptive grooves 21, the outer wall of one side of one sealing plate 22 is provided with sealing holes 24 at equal intervals, the outer wall of the other sealing plate 22 is fixedly connected with sealing rods 25 at equal intervals, and the positions and the number of the sealing rods 25 and the sealing holes 24 are all adaptive.
Referring to fig. 1, 2 and 6, the outer walls of the two sides of the experimental box 1 are equally spaced with pressure relief holes, the inner wall of each pressure relief hole is fixedly connected with a pressure relief pipe 12, and the inner wall of each pressure relief pipe 12 is slidably connected with an inner adjusting pipe 11.
In the invention, the inner wall of the pressure relief pipe 12 close to the opening end is fixedly connected with a limiting ring 34, the outer wall of the pressure relief pipe 12 is fixedly connected with a fixed ring 31, the outer wall of the inner adjusting pipe 11 is fixedly connected with an adjusting ring 32, the outer wall of the inner adjusting pipe 11 close to the opening end is connected with a pressure relief valve 33 through a flange, the outer walls of the fixed ring 31 and the adjusting ring 32 at the opposite sides are fixedly connected with connecting springs 14 at equal intervals, and by arranging the pressure relief pipe 12, the connecting springs 14 and the inner adjusting pipe 11, when the pressure pump 5 applies pressure to the water body in the test box 1, the inner adjusting pipe 11 is driven to move outwards when the pressure in the test box 1 is larger, the connecting spring 14 is stretched, thereby preventing the pressure relief valve 33 on the inner regulation pipe 11 from being damaged due to excessive pressure, and at the same time, in the pressure relief process, the length of the pressure relief pipe 12 and the length of the inner adjusting pipe 11 are stretched, so that the safety in the pressure relief process is improved.
When the test box is used, the cable body 6 penetrates through the through holes formed in the two fixing frames 7, then the adjusting cylinder 9 drives the extrusion frame 16 to extrude the cable body 6, in the extrusion process, the adjusting hydraulic cylinder 18 drives the abutting contact 19 to be in contact with the cable body 6, then the abutting contact is pressed into the bottom of the test box 1, so that the cable body 6 is in contact with the inner wall of the bottom of the test box 1, then the hydraulic cylinder 18 drives the abutting contact 19 to reset, the water pressure detection result error caused by the contact between the abutting contact 19 and the cable body 6 is prevented, the cable body 6 pressed into the test box 1 is of a C-like structure, the cable body 6 can be in contact with water bodies at different levels in the water pressure experiment process, the water pressure borne by each position is different, meanwhile, the cable body 6 and the inner walls on two sides of the test box 1 are extruded to be in a bending state, and a plurality of groups of data are obtained in a single experiment process, in the process that the cable body 6 is pressed into the experiment box 1, the cable bodies 6 at two ends are clamped into the side limit frames 13, the cable body 6 extrudes the sliding roller 30, so that the extrusion spring 28 is compressed, the reaction force of the extrusion spring 28 drives the sliding roller 30 to limit two ends of the cable body 6, and the cable body can smoothly slide into the bottom of the experiment box 1, meanwhile, in the process that the cable body 6 slides, the sliding roller 30 drives the connecting shaft 27 to rotate in the installation frame 26, so that the abrasion of the cable body 6 in the descending process is reduced, after the cable body 6 is fixed, the second hydraulic cylinder 23 is adjusted to drive the sealing plates 22 to move, so that the two sealing plates 22 are contacted, after the two sealing plates 22 are contacted, the sealing rods 25 are clamped into the corresponding sealing holes 24, the sealing effect is further improved, and the working process of the pressure pump 5 is ensured, the condition that atmospheric pressure revealed can not appear, then start force pump 5, force pump 5 is with the leading-in 15 inner walls of external gaseous pressure plate, discharge through pressure boost hole 10, thereby exert pressure to the water, when exerting pressure to the water of proof box 1 inside through force pump 5, the pressure of 1 inside of proof box is great, then drive interior control tube 11 and outwards remove, coupling spring 14 is stretched, thereby prevent that relief valve 33 on interior control tube 11 from appearing damaging because of pressure is too big, and simultaneously, carrying out the pressure release in-process, with 12 and 11 length extensions of interior control tube of pressure release pipe, improve the security of pressure release in-process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The preparation method of the fireproof and wear-resistant cable is characterized by comprising the following steps:
s1: the production process comprises the steps of adding a magnesium tube into a conductor, filling, adding magnesium powder, heading, compressing, drawing, continuously annealing under gas protection, drawing (repeating) and continuously annealing under gas protection (repeating);
s2: the testing process comprises a hydrostatic test and an electric withstand voltage test;
s3: the packaging process comprises the steps of adding an outer sheath, sealing, re-inspecting and packaging;
wherein, the water pressure experimental facilities includes experimental box (1), its characterized in that, the equal fixedly connected with mount (7) of both sides outer wall of experimental box (1), and the equal fixedly connected with cylinder (9) of outer wall of two mounts (7), two the same regulating plate (8) of bottom outer wall fixedly connected with of cylinder (9), and the equal fixedly connected with of bottom outer wall of regulating plate (8) extrudes frame (16), the inner wall equidistance fixedly connected with installation pole (17) of extrusion frame (16), every the impartial distance fixedly connected with pneumatic cylinder (18) of outer wall of installation pole (17), and the equal fixedly connected with of outer wall of every pneumatic cylinder (18) supports contact (19), two the outer wall of mount (7) all opens and has the perforation, and two fenestrate inner walls are pegged graft and have same cable body (6).
2. The preparation method of the fireproof and wear-resistant cable according to claim 1, wherein the inner walls of the two sides of the experimental box (1) are fixedly connected with the side limiting frames (13), and the inner walls of the two side limiting frames (13) are provided with the extrusion limiting assemblies.
3. A method for preparing a fireproof and wear-resistant cable according to claim 2, wherein the extrusion limiting assembly comprises a mounting frame (26), the inner walls of the two sides of the mounting frame (26) are connected with the same connecting shaft (27) through bearings, and the outer wall of the connecting shaft (27) is fixedly connected with a sliding roller (30).
4. A method for preparing a fireproof and wear-resistant cable according to claim 3, wherein the outer wall of the installation frame (26) is fixedly connected with the extrusion springs (28) at equal intervals, the outer wall of the installation frame (26) between every two adjacent extrusion springs (28) is fixedly connected with the connection telescopic rod (29), and the connection telescopic rod (29) and the extrusion springs (28) are fixedly connected to the inner wall of the side limiting frame (13).
5. The preparation method of the fireproof and wear-resistant cable according to claim 1, wherein the inner walls of two sides of the experimental box (1) are fixedly connected with the pressure plates (15), the outer walls of the bottoms of the two pressure plates (15) are provided with the pressure holes (10) at equal distances, the outer wall of the experimental box (1) close to the bottom end is provided with the drainage hole, the inner wall of the drainage hole is fixedly connected with the drainage pipe (3), and the outer wall of the drainage pipe (3) is connected with the water valve (2) through the flange.
6. A preparation method of a fireproof and wear-resistant cable according to claim 5, wherein the outer walls of two sides of the experimental box (1) are fixedly connected with the pump racks (4), the outer walls of the top parts of the two pump racks (4) are fixedly connected with the pressure pumps (5), and the pressurizing ends of the pressure pumps (5) are connected to the inside of the pressurizing plate (15) through pipelines.
7. The preparation method of the fireproof and wear-resistant cable according to claim 6, wherein vertical plates (20) are fixedly connected to the outer walls of the tops of the two pressure plates (15), second hydraulic cylinders (23) are fixedly connected to the outer walls of the two vertical plates (20) at equal distances, and the same sealing plate (22) is fixedly connected to the outer walls of the second hydraulic cylinders (23) on the same vertical plate (20).
8. A method for preparing a fireproof and wear-resistant cable according to claim 7, wherein the outer walls of the two sealing plates (22) are provided with adaptive grooves (21), one side of the outer wall of one sealing plate (22) is provided with sealing holes (24) at equal intervals, the outer wall of the other sealing plate (22) is fixedly connected with sealing rods (25) at equal intervals, and the positions and the number of the sealing rods (25) and the sealing holes (24) are adaptive.
9. The preparation method of the fireproof and wear-resistant cable according to claim 1, wherein pressure relief holes are formed in the outer walls of the two sides of the experimental box (1) at equal distances, a pressure relief pipe (12) is fixedly connected to the inner wall of each pressure relief hole, and an inner adjusting pipe (11) is slidably connected to the inner wall of each pressure relief pipe (12).
10. The preparation method of the fireproof and wear-resistant cable according to claim 9, wherein a limiting ring (34) is fixedly connected to the inner wall of the pressure relief pipe (12) close to the opening end, a fixing ring (31) is fixedly connected to the outer wall of the pressure relief pipe (12), an adjusting ring (32) is fixedly connected to the outer wall of the inner adjusting pipe (11), a pressure relief valve (33) is connected to the outer wall of the inner adjusting pipe (11) close to the opening end through a flange, and connecting springs (14) are fixedly connected to the outer walls of the fixing ring (31) and the adjusting ring (32) on the opposite sides at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111548092.3A CN114220605A (en) | 2021-12-17 | 2021-12-17 | Fireproof and wear-resistant cable and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111548092.3A CN114220605A (en) | 2021-12-17 | 2021-12-17 | Fireproof and wear-resistant cable and preparation method thereof |
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| CN114220605A true CN114220605A (en) | 2022-03-22 |
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| CN114628089A (en) * | 2022-04-11 | 2022-06-14 | 安徽省众和电仪科技有限公司 | Production process of field bus cable with long transmission distance and low attenuation |
| CN114751036A (en) * | 2022-04-25 | 2022-07-15 | 重庆科宝电缆股份有限公司 | Filling magnesium oxide powder feeding hopper and insulating fireproof cable magnesium oxide filling method |
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| CN114751036B (en) * | 2022-04-25 | 2024-03-15 | 重庆科宝电缆股份有限公司 | Magnesia powder filling hopper and magnesia filling method for insulated fireproof cable |
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