CN209786294U - Explosion-proof cable connector - Google Patents
Explosion-proof cable connector Download PDFInfo
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- CN209786294U CN209786294U CN201920931686.4U CN201920931686U CN209786294U CN 209786294 U CN209786294 U CN 209786294U CN 201920931686 U CN201920931686 U CN 201920931686U CN 209786294 U CN209786294 U CN 209786294U
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Abstract
The utility model discloses a flame-proof cable connector, which comprises a first shell and a second shell which can be mutually spliced, and a socket component and a plug component which can be mutually spliced, wherein both the plug component and the socket component can be matched with the first shell or the second shell; the plug component comprises a plurality of convex needle bodies, a convex needle seat for the insertion of the convex needle bodies and a needle cover for tightly abutting the convex needle bodies in the convex needle seat; the socket component comprises a plurality of concave needle bodies which can form insertion connection with corresponding convex needle bodies, a concave needle seat for inserting the plurality of concave needle bodies and a needle cover for tightly pressing the concave needle bodies in the concave needle seat; first mounting groove and second mounting groove have been seted up respectively to the one end that first casing and second casing are used for the installation, and first mounting groove and second mounting groove homoenergetic are used for the installation location to plug subassembly and socket subassembly. The utility model has the advantages that: the connector is more convenient for the staff to assemble, and is not easy to be misassembled, which is beneficial to improving the assembly efficiency.
Description
Technical Field
The utility model belongs to the technical field of the technique of cable connector and specifically relates to a flame proof type cable connector is related to.
Background
the explosion-proof cable connector is a cable connecting device with an explosion-proof structure.
The patent with publication number CN106129711A discloses a flameproof electrical connector, which includes an electrical connector housing, an insulator is arranged in an inner cavity of the electrical connector housing, the electrical connector housing is a cylindrical housing, the insulator is a columnar insulator adapted to the cylindrical housing, a housing flameproof surface extending along an axial direction of the cylindrical housing is arranged on an inner circumferential surface of the cylindrical housing, an insulator flameproof surface extending along the axial direction of the cylindrical insulator is arranged on an outer circumferential surface of the cylindrical insulator, and the housing flameproof surface is in clearance fit with the insulator flameproof surface to form an insulator flameproof clearance extending along the axial direction of the insulator by a first set length.
The connector is generally divided into a plug assembly and a socket assembly, the installation modes of the plug assembly and the socket assembly are different greatly, workers are required to have high familiarity with the structure, and the problem of low installation efficiency exists for new workers and needs to be improved.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model provides a flame-proof type cable connector through structural improvement, is favorable to improving the installation effectiveness.
In order to achieve the above purpose, the utility model provides a following technical scheme:
A flame-proof type cable connector comprises a first shell and a second shell which can be mutually inserted, and a socket assembly and a plug assembly which can be mutually inserted, wherein the plug assembly and the socket assembly can be matched with the first shell or the second shell; the plug component comprises a plurality of convex needle bodies, a convex needle seat for the insertion of the convex needle bodies and a needle cover for tightly abutting the convex needle bodies in the convex needle seat; the socket component comprises a plurality of concave needle bodies which can form insertion connection with corresponding convex needle bodies, a concave needle seat for inserting the plurality of concave needle bodies and a needle cover for tightly pressing the concave needle bodies in the concave needle seat; first mounting groove and second mounting groove have been seted up respectively to the one end that first casing and second casing are used for the installation, first mounting groove and second mounting groove homoenergetic are used for the installation location to plug subassembly and socket subassembly.
Through adopting above-mentioned technical scheme, among plug subassembly and the socket subassembly, protruding needle file and concave needle file can general assembly in first casing or second casing to can adopt the needle lid of the same specification to assemble protruding needle body and concave needle body fixed mounting in corresponding protruding needle file and concave needle file, the staff of being convenient for more assembles the connector, and is difficult for the wrong dress, is favorable to improving assembly efficiency.
The utility model discloses further set up to: the convex needle body comprises a wiring part, a transition part and a connection part, the concave needle body comprises a connection part and a wiring part, and a plurality of deformation grooves are formed in the side wall of the connection part.
By adopting the technical scheme, the deformation groove is formed in the side wall of the insertion part, so that the connection stability of the convex pin body and the concave pin body during insertion is improved under the elastic deformation effect of metal.
The utility model discloses further set up to: the outside of connecting portion has cup jointed the elastic ring, the lateral wall of elastic ring is the open loop setting.
Through adopting above-mentioned technical scheme, through the setting of elastic ring, when the convex needle body of being convenient for inserts in the concave needle body, further improved the connection stability of both when pegging graft.
The utility model discloses further set up to: the end of the convex needle base is provided with a plurality of first convex rings wrapping the corresponding transition parts, and the end of the concave needle base is provided with a plurality of first slots for the first convex rings to be inserted into.
Through adopting above-mentioned technical scheme, the wiring portion of protruding needle body is through seting up the recess in order to insert the cable, and the problem that the lug connection grafting portion leads to structural strength not enough easily, and the setting through transition portion has then compensatied not enough in the intensity, and the setting of first bulge loop has then further improved the structural strength of protruding needle body. In addition, the plug-in fit between the first convex ring and the first slot effectively improves the connection stability between the plug assembly and the socket assembly.
The utility model discloses further set up to: the plug assembly and the socket assembly are arranged inside the first shell or the second shell, and the end part of the second shell is provided with a plug-in groove for inserting the end part of the first shell.
Through adopting above-mentioned technical scheme, plug subassembly and socket subassembly all set up in the inside of first casing or second casing, have guaranteed that plug subassembly and socket subassembly can obtain better protection after reverse installation in first casing or second casing, and in first casing can insert the second casing, are favorable to improving installation stability.
the utility model discloses further set up to: the spacing groove has all been seted up to the lateral wall of neilsbed and convex needle seat, the inner wall of first casing and second casing all is provided with the spacing arch with spacing groove matched with, the spacer pin is worn to be equipped with towards the tip of second casing by first casing, the one end of spacer pin and the outside wall parallel and level of first casing, other end protrusion in the inside wall of first casing, the one end of spacer pin in first casing can cooperate with the spacing groove of neilsbed or convex needle seat in the second casing.
By adopting the technical scheme, the arrangement of the limiting bulges in the first shell and the second shell ensures that the convex needle seat and the concave needle seat can be directionally installed, has good fool-proof effect, avoids the convex needle seat and the concave needle seat from rotating in the corresponding first shell or the second shell, and improves the stability. And through the setting of spacer pin, further improved prevent slow-witted effect, guaranteed the correct butt joint of plug subassembly and socket subassembly.
The utility model discloses further set up to: the lateral wall of first casing and second casing all is provided with first fixed plate and second fixed plate, first fixed plate is the fusiformis setting, the second fixed plate is the square setting, the both ends of first fixed plate respectively with the two diagonal position threaded connection of second fixed plate.
Through adopting above-mentioned technical scheme, through the both ends with first fixed plate and the two diagonal angle department threaded connection of second fixed plate, when guaranteeing both connection stability, the remaining two diagonal angle departments of second fixed plate can be used for fixing the second fixed plate on wall body or equipment, the installation of being convenient for.
The utility model discloses further set up to: the end portion threaded connection that first casing deviates from the second casing has two screwed joint, be provided with the sealing washer in two screwed joint and be used for supporting the clamping ring of tight sealing washer, the end portion threaded connection of two screwed joint has the gland that is used for supporting the clamping ring, the lateral wall of two screwed joint and gland all is provided with the hexagonal ring.
Through adopting above-mentioned technical scheme, through two screwed joint, for sealing washer and clamping ring provide installation space to the elastic action of cooperation sealing washer and the squeezing action of clamping ring to the sealing washer make the sealing washer can bunch many cables and form sealed effect earlier, accomplish the fixed to sealing washer and clamping ring through the gland at last.
the utility model discloses further set up to: the end part of the second shell, which is far away from the first shell, is in threaded connection with a threaded ring used for tightly abutting against the needle cover, and the end face of the threaded ring is provided with four control grooves which are uniformly arranged along the circumferential direction of the threaded ring.
Through adopting above-mentioned technical scheme, fix its simple structure through the threaded ring to plug subassembly or socket subassembly in the second casing. And the four control grooves are arranged, so that the working personnel can further reinforce the threaded ring through the screwdriver, and the reinforcing mode is simple and convenient.
The utility model discloses further set up to: the needle lid includes the faller, one side of faller is provided with a plurality of location archs, the faller all runs through the through-hole that supplies the cable to pass in every protruding department of location, the opposite side of faller all is provided with the strengthening rib between adjacent through-hole, and is a plurality of the one end interconnect of strengthening rib is radial setting.
Through adopting above-mentioned technical scheme, protruding through a plurality of location on the faller, carry on spacing fixedly to corresponding protruding needle body and concave needle body, assemble and interconnect the one end of a plurality of strengthening ribs, effectively improved the structural strength of needle lid, avoid the cable in the fracture of rotation or activity in-process needle lid.
To sum up, the utility model discloses following beneficial effect has:
1. In plug subassembly and socket subassembly, protruding needle file and concave needle file can general assembly in first casing or second casing to can adopt the needle lid of the same specification to assemble protruding needle body and concave needle body fixed mounting in corresponding protruding needle file and concave needle file, the staff of being convenient for more assembles the connector, and is difficult for the wrong dress, is favorable to improving assembly efficiency. In the occasion that the function of preventing the misplug is needed, especially when a plurality of sets of cable connectors are used simultaneously, different male needle bases, female needle bases, male needle bodies and female needle bodies can be installed in different plug assemblies and socket assemblies, the combination of the plug assemblies and the socket assemblies in different forms is realized, and the accident caused by the misplug of an operator can be effectively avoided;
2. Through the setting of spacing bellied in first casing and the second casing, guaranteed that convex needle seat and concave needle seat homoenergetic are installed by orientation, have good fool-proof effect, and avoided convex needle seat and concave needle seat to take place to rotate in corresponding first casing or second casing, improved stability. Due to the arrangement of the limiting pin, the fool-proof effect is further improved, and the plug assembly and the socket assembly are ensured to be correctly butted;
3. Through the both ends with first fixed plate and the two diagonal angle department threaded connection of second fixed plate, when guaranteeing both connection stability, the remaining two diagonal angle departments of second fixed plate can be used for fixing the second fixed plate on wall body or equipment, the installation of being convenient for.
Drawings
FIG. 1 is a schematic structural view of the present embodiment;
FIG. 2 is an exploded view of the present embodiment;
FIG. 3 is an exploded view of the plug assembly and receptacle assembly of this embodiment;
Fig. 4 is a schematic sectional view of the present embodiment.
Reference numerals: 1. a first housing; 1-1, a first connection; 1-2, a second connecting part; 2. a second housing; 3. a plug assembly; 3-1, a convex needle body; 3-11, a wiring part; 3-12, a transition portion; 3-13, a patch part; 3-2, a convex needle seat; 4. a receptacle assembly; 4-1, a concave needle body; 4-11, a plug part; 4-12, connecting line part; 4-2, a concave needle seat; 4-3, an elastic ring; 5. a needle cover; 5-1, needle plate; 5-2, positioning protrusions; 5-3, reinforcing ribs; 6. a first convex ring; 7. a deformation groove; 8. a limiting ring; 9. a first mounting groove; 10. a second mounting groove; 11. a limiting groove; 12. a spacing pin; 13. a first fixing plate; 14. a second fixing plate; 15. a threaded ring; 16. a control slot; 17. a double-screw joint; 18. a seal ring; 19. pressing a ring; 20. and (7) pressing the cover.
Detailed Description
the present invention will be described in further detail with reference to the accompanying drawings.
An explosion-proof cable connector is shown in fig. 1 and fig. 2, and is a nine-core connector, which includes a first housing 1 and a second housing 2 that can be plugged into each other, a socket assembly 4 and a plug assembly 3 that can be plugged into each other. The first shell 1 comprises a first connecting part 1-1 and a second connecting part 1-2 which are cylindrical, the outer diameter of the first connecting part 1-1 is larger than that of the second connecting part 1-2, the second shell 2 is also cylindrical, and an inserting groove for inserting the second connecting part 1-2 is formed in the end part of the second shell 2. After the first housing 1 and the second housing 2 are plugged into each other, the socket assembly 4 and the plug assembly 3 can be plugged into each other. Wherein, the plug assembly 3 and the socket assembly 4 can be matched with the first shell 1 or the second shell 2.
As shown in fig. 3 and 4, the plug component 3 includes nine needle bodies 3-1, a needle holder 3-2 into which the nine needle bodies 3-1 are inserted, and a needle cover 5 for tightly pressing the needle bodies 3-1 into the needle holder 3-2, the nine needle bodies 3-1 are mounted on the needle holder 3-2 in a manner that one needle body 3-1 axially disposed on the needle holder 3-2 is a circle center, and the other eight needle bodies 3-1 are uniformly arranged along a circumferential direction of the circle center.
The convex needle body 3-1 comprises a wiring part 3-11, a transition part 3-12 and a plug part 3-13, the diameters of which are sequentially reduced, and a through hole for the plug part 3-13 and the transition part 3-12 to pass through and a groove for limiting the wiring part 3-11 are formed in the convex needle base 3-2. The end face of the convex needle base 3-2 is integrally connected with nine first convex rings 6 covering the end parts of the corresponding transition parts 3-12, and the inserting part 3-13 of each convex needle body 3-1 is exposed out of the outer side of the first convex ring 6.
The socket component 4 comprises nine concave needle bodies 4-1, a concave needle seat 4-2 for inserting the nine concave needle bodies 4-1 and a needle cover 5 for tightly abutting the concave needle bodies 4-1 in the concave needle seat 4-2, and the mounting positions of the nine concave needle bodies 4-1 correspond to the mounting positions of the nine convex needle bodies 3-1. Each concave needle body 4-1 comprises an inserting part 4-11 and a connecting line part 4-12, the diameter of the connecting line part 4-12 is larger than that of the inserting part 4-11, a through hole for the inserting part 4-11 to pass through and a groove for limiting the connecting line part 4-12 are formed in the concave needle seat 4-2, and the inner diameters of the grooves of the convex needle seat 3-2 and the concave needle seat 4-2 are equal. The end of the concave needle seat 4-2 is provided with nine first slots for inserting the corresponding first convex rings 6, so that the butt joint stability is improved.
The inserting part 3-13 of the convex pin body 3-1 can be inserted into the inserting part 4-11 of the corresponding concave pin body 4-1, and the side wall of the inserting part 4-11 of the concave pin body 4-1 is provided with three deformation grooves 7 so as to improve the adaptability and inserting stability of the inserting part 4-11 to the concave pin body 4-1. In order to further improve the plugging stability, the outer side wall of the plugging part 4-11 is also sleeved with an elastic ring 4-3 made of elastic metal materials, and the side wall of each elastic ring 4-3 is in open-loop arrangement. The diameter of the inserting part 3-13 is larger than the inner diameter of the inserting part 4-11, after the deforming groove 7 and the elastic ring 4-3 are expanded by the inserting part 3-13, the inserting part 4-11 can generate stronger clamping force to the inserting part 3-13 under the elastic action, so that the stability is improved.
The specification and the structure of the needle cover 5 in the socket component 4 and the plug component 3 are the same, the needle cover 5 comprises a disc-shaped needle plate 5-1, one side of the needle plate 5-1 facing the corresponding convex needle seat 3-2 or the concave needle seat 4-2 is integrally connected with nine positioning bulges 5-2, and the nine positioning bulges 5-2 are matched with the corresponding grooves so as to tightly abut against the corresponding convex needle body 3-1 and the concave needle body 4-1. The needle plate 5-1 is provided with through holes for cables to pass through at the positions of the positioning bulges 5-2, and the positioning bulges 5-2 not only can play a role in positioning, but also can play a role in strengthening the structures of the through holes. Reinforcing ribs 5-3 are uniformly connected between every two adjacent through holes on the other side of the needle plate 5-1, and one end of each reinforcing rib 5-3 is mutually converged and connected, so that the plurality of reinforcing ribs 5-3 are radially arranged.
In addition, the side wall of one end of the convex needle seat 3-2 and the concave needle seat 4-2 which are deviated from each other is integrally connected with a limit ring 8. The first casing 1 and the second casing 2 are used for the one end of installation to offer respectively also has first mounting groove 9 and second mounting groove 10, and the internal diameter of first mounting groove 9 and second mounting groove 10 equals with the diameter of spacing ring 8. So that both the first housing 1 and the second housing 2 can be used for the positional mounting of the plug assembly 3 and the socket assembly 4.
as shown in fig. 2 and 3, the side walls of the female needle seat 4-2 and the male needle seat 3-2 are both provided with a limiting groove 11, and the inner walls of the first casing 1 and the second casing 2 are integrally connected with a limiting protrusion matched with the limiting groove 11, so that the female needle seat 4-2 and the male needle seat 3-2 can be installed in a specific direction, and a good fool-proof effect is achieved. The end part of the first shell 1 facing the second shell 2 is provided with a limit pin 12 in a penetrating way, one end of the limit pin 12 is flush with the outer side wall of the second shell 2, and the other end of the limit pin protrudes out of the inner side wall of the first shell 1, so that one end of the limit pin 12 in the first shell 1 can be matched with a limit groove 11 of a concave needle seat 4-2 or a convex needle seat 3-2 in the second shell 2, and the accuracy of butt joint between the plug component 3 and the socket component 4 is ensured.
As shown in fig. 1 and 2, a first fixing plate 13 and a second fixing plate 14 are integrally connected to the side walls of the first housing 1 and the second housing 2, respectively, the first fixing plate 13 is disposed in a shuttle shape, and the second fixing plate 14 is disposed in a square shape. Two ends of the first fixing plate 13 are respectively in threaded connection with two opposite corners of the second fixing plate 14, so as to fix the first casing 1 and the second casing 2 to each other. The other two pairs of corners of the second fixing plate 14 are provided with mounting holes, the second shell 2 can be mounted on the wall of a wall or equipment, and the second shell 2 can be fixedly mounted through the two mounting holes on the second fixing plate 14.
as shown in fig. 2 and 4, a threaded ring 15 for abutting against the needle cover 5 is connected to the end of the second housing 2 away from the first housing 1 in a threaded manner, four control grooves 16 are formed in the end surface of the threaded ring 15 and are uniformly arranged in the circumferential direction of the threaded ring, and an operator can fasten the threaded ring 15 to the end of the second housing 2 by using a straight screwdriver.
The end part of the first shell 1 departing from the second shell 2 is connected with a double-screw joint 17 in a circular tube shape in a threaded manner, and nine cables penetrate through the double-screw joint 17 and penetrate into the needle cover 5 to be connected with the corresponding convex needle body 3-1 or the concave needle body 4-1. The double-screw joint 17 is in threaded connection with the first shell 1, and the needle cover 5 can be tightly abutted to the convex needle seat 3-2 by screwing the double-screw joint 17. A sealing ring 18 is arranged in the double-screw connector 17, and the sealing ring 18 is sleeved outside nine cables at the same time, so that the wire bundling and sealing effects are good. In addition, a pressing ring 19 for extruding the sealing ring 18 is further arranged in the double-screw joint 17, and the sealing ring 18 will expand radially after being extruded, so that the wire bundling and sealing effects are further improved. The end part of the double-screw joint 17 is in threaded connection with a gland 20 which is used for abutting against and fixing the pressing ring 19, the gland 20 and the double-screw joint 17 can be screwed tightly by workers, the outer side walls of the gland 20 and the double-screw joint 17 are integrally connected with a hexagonal ring, and the workers can be fixed by a wrench conveniently.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.
Claims (10)
1. An explosion-proof cable connector is characterized in that: the plug assembly comprises a first shell (1) and a second shell (2) which can be mutually plugged, and a socket assembly (4) and a plug assembly (3) which can be mutually plugged, wherein the plug assembly (3) and the socket assembly (4) can be matched with the first shell (1) or the second shell (2);
The plug component (3) comprises a plurality of convex needle bodies (3-1), a convex needle seat (3-2) for the insertion of the convex needle bodies (3-1) and a needle cover (5) for tightly abutting the convex needle bodies (3-1) in the convex needle seat (3-2);
The socket component (4) comprises a plurality of concave needle bodies (4-1) which can be spliced with the corresponding convex needle bodies (3-1), a concave needle seat (4-2) into which the plurality of concave needle bodies (4-1) are inserted, and a needle cover (5) which tightly supports the concave needle bodies (4-1) in the concave needle seat (4-2);
First mounting groove (9) and second mounting groove (10) have been seted up respectively to the one end that first casing (1) and second casing (2) are used for the installation, first mounting groove (9) and second mounting groove (10) homoenergetic are used for the installation location to plug subassembly (3) and socket subassembly (4).
2. The flameproof cable connector of claim 1, characterized in that: the convex needle body (3-1) comprises a wiring part (3-11), a transition part (3-12) and a connection part (3-13), the concave needle body (4-1) comprises a connection part (4-11) and a connection part (4-12), and the side wall of the connection part (4-11) is provided with a plurality of deformation grooves (7).
3. The flameproof cable connector of claim 2, characterized in that: the outer side of the insertion part (4-11) is sleeved with an elastic ring (4-3), and the side wall of the elastic ring (4-3) is in open-loop arrangement.
4. The flameproof cable connector of claim 2, characterized in that: the end part of the convex needle seat (3-2) is provided with a plurality of first convex rings (6) wrapping the corresponding transition parts (3-12), and the end part of the concave needle seat (4-2) is provided with a plurality of first slots for the first convex rings (6) to be inserted into.
5. The flameproof cable connector of claim 1, characterized in that: the plug assembly (3) and the socket assembly (4) are arranged inside the first shell (1) or the second shell (2), and the end part of the second shell (2) is provided with a plug-in groove for inserting the end part of the first shell (1).
6. The flameproof cable connector of claim 5, characterized in that: spacing groove (11) have all been seted up to the lateral wall of concave needle seat (4-2) and convex needle seat (3-2), the inner wall of first casing (1) and second casing (2) all is provided with spacing groove (11) matched with spacing arch, spacer pin (12) are worn to be equipped with by first casing (1) towards the tip of second casing (2), the one end of spacer pin (12) and the outside wall looks parallel and level of first casing (1), other end protrusion in the inside wall of first casing (1), one end of spacer pin (12) in first casing (1) can cooperate with spacing groove (11) of concave needle seat (4-2) or convex needle seat (3-2) in second casing (2).
7. The flameproof cable connector of claim 5, characterized in that: the side walls of the first shell (1) and the second shell (2) are provided with a first fixing plate (13) and a second fixing plate (14), the first fixing plate (13) is arranged in a shuttle shape, the second fixing plate (14) is arranged in a square shape, and two ends of the first fixing plate (13) are respectively in threaded connection with two opposite corners of the second fixing plate (14).
8. The flameproof cable connector of claim 1, characterized in that: the end part thread of deviating from second casing (2) of first casing (1) has double screw joint (17), be provided with sealing washer (18) in double screw joint (17) and be used for supporting clamping ring (19) of tight sealing washer (18), the end part thread connection of double screw joint (17) has gland (20) that are used for supporting clamping ring (19), the lateral wall of double screw joint (17) and gland (20) all is provided with the hexagonal ring.
9. The flameproof cable connector of claim 8, wherein: the end part of the second shell (2) departing from the first shell (1) is in threaded connection with a threaded ring (15) used for tightly abutting against the needle cover (5), and the end face of the threaded ring (15) is provided with four control grooves (16) which are uniformly arranged along the circumferential direction of the threaded ring.
10. The flameproof cable connector of claim 1, characterized in that: the needle cover (5) comprises a needle plate (5-1), a plurality of positioning protrusions (5-2) are arranged on one side of the needle plate (5-1), through holes for cables to pass through are formed in the positions of the positioning protrusions (5-2) of the needle plate (5-1), reinforcing ribs (5-3) are arranged between adjacent through holes on the other side of the needle plate (5-1), and one ends of the reinforcing ribs (5-3) are connected with each other in a radial mode.
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CN201920931686.4U CN209786294U (en) | 2019-06-19 | 2019-06-19 | Explosion-proof cable connector |
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CN201920931686.4U CN209786294U (en) | 2019-06-19 | 2019-06-19 | Explosion-proof cable connector |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110165487A (en) * | 2019-06-19 | 2019-08-23 | 浙江旭通智能科技有限公司 | A kind of bolted flame-proof cable coupling device for mine |
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2019
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110165487A (en) * | 2019-06-19 | 2019-08-23 | 浙江旭通智能科技有限公司 | A kind of bolted flame-proof cable coupling device for mine |
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