CN114498533A - Large-diameter cable joint - Google Patents
Large-diameter cable joint Download PDFInfo
- Publication number
- CN114498533A CN114498533A CN202210150135.0A CN202210150135A CN114498533A CN 114498533 A CN114498533 A CN 114498533A CN 202210150135 A CN202210150135 A CN 202210150135A CN 114498533 A CN114498533 A CN 114498533A
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- Prior art keywords
- pipe
- cable
- circular tube
- wall
- insulating layer
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Links
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims description 24
- 238000009413 insulation Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 38
- 239000004020 conductor Substances 0.000 description 20
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
-
- 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
- H02G15/00—Cable fittings
- H02G15/007—Devices for relieving mechanical stress
Landscapes
- Processing Of Terminals (AREA)
- Cable Accessories (AREA)
Abstract
The invention relates to a large-diameter cable joint, which effectively solves the problem that the large-diameter cable joint has poor capability of bearing axial tension; the technical scheme includes that the cable clamp comprises a groove grinding unit and a connecting unit, the groove grinding unit can grind an annular clamping groove with a wedge-shaped section on a cable insulating layer, the connecting unit comprises a second round pipe and two third round pipes, two radial compression screws are mounted on the side wall of the second round pipe and are symmetrically arranged along the axial direction, a clamping unit is arranged on the inner wall of each third round pipe, after the third round pipes are sleeved on the insulating layer of the cable, the clamping units are clamped into the annular clamping groove to axially limit the third round pipes, and the two third round pipes are connected with the second round pipes through screws; according to the invention, the clamping unit and the annular clamping groove are matched to bear the axial pulling force of the cable, so that the cable joint can be prevented from being disconnected, the joint can be effectively and stably jointed for a long time without falling off, and the failure rate of the joint is greatly reduced.
Description
Technical Field
The invention relates to the field of power transmission equipment, in particular to a large-diameter cable joint.
Background
In a power transmission line, large-diameter cables are often used, end-to-end connection between the cables cannot be avoided, joints of the large-diameter cables are not twisted together like a household power transmission line and are wound by using an insulating tape, the cables are required to be stripped layer by layer into a step shape, broken ends of conductors leak out, conductor heads at two ends are inserted into a circular tube and are pressed tightly by a compression screw, insulating layer protective layers and the like are wound and wrapped layer by layer from inside to outside, and some cables are required to be filled with glue and sealed finally; therefore, the joint of the large-diameter cable is a delicate and tedious work, even if the joint is carried out, the existing joint mode still has one defect that the joint position of the cable is lack of axial limit, the conductor head is compressed tightly only through a compression screw, and the adhesive force between the wrapped insulating adhesive tape and the cable bears axial tension, however, the overhead large-diameter cable is heavy due to self weight, and in addition, due to shaking under external forces such as strong wind, earthquake and the like, the generated axial tension is very large, even if the buried cable is also subjected to huge axial tension due to earthquake, soil layer creeping, soil body settlement and the like, the joint of the cable is easy to break again, and the joint is a weak point of the cable.
Disclosure of Invention
The invention provides a large-diameter cable joint, aiming at solving the problem that the large-diameter cable joint has poor capability of bearing axial tension.
The technical scheme for solving the problem is that the grinding device comprises a grinding groove unit and a connecting unit, wherein the grinding groove unit comprises a first circular tube, a radial first sliding rod penetrates through the side wall of the first circular tube, a first spring is arranged between the outer end of the first sliding rod and the outer wall of the first circular tube, a rotatable conical grinding head is arranged at the inner end of the first sliding rod, the axis of the grinding head is parallel to the axis of the first circular tube, and the grinding head is connected with a driving motor; when the first round pipe is sleeved on an insulating layer of a cable, under the action of a first spring, the polishing head presses the outer wall of the insulating layer, a driving motor is started to drive the polishing head to rotate, and meanwhile, the first round pipe is rotated, and the polishing head polishes an annular clamping groove with a wedge-shaped section on the insulating layer; the connecting unit comprises a second round pipe and two third round pipes, two radial compression screws are mounted on the side wall of the second round pipe, and the two compression screws are symmetrically arranged along the axial direction; the inner wall of every third pipe all is equipped with the joint unit, and the third pipe box back on the insulating layer of cable, joint unit card goes into to carry out the axial spacingly to the third pipe in the ring groove, all is equipped with axial screw rod in the lateral wall of every third pipe, and axial screw hole has all been opened at every end of second pipe, and the screw rod tip stretches out the third pipe outside and can rotate into the threaded hole of second pipe tip.
The annular clamping grooves and the clamping units are all axially arranged in multiple groups, and the distance between the annular clamping grooves is equal to the distance between the clamping units.
The clamping unit comprises a radial mounting hole formed in the inner wall of the third circular tube, an elastic clamping block is mounted in the mounting hole, a second spring is mounted at the outer end of the elastic clamping block, the inner end of the elastic clamping block is in a wedge shape, and the inner end of the elastic clamping block can be clamped into the annular clamping groove under the action of the second spring.
The diameter of the inner port of the mounting hole is smaller than that of the hole body, the inner end of the elastic clamping block is smaller than the outer end of the elastic clamping block, the inner end of the elastic clamping block extends out of the inner port of the mounting hole, and the outer end of the mounting hole is screwed with a plug.
The clamping unit is an annular bulge arranged on the inner wall of the third circular tube, the cross section of the annular bulge is the same as that of the annular clamping groove, and the annular bulge is clamped into the annular clamping groove to perform axial limiting.
The third round pipe is split into two identical parts along the axis, the two parts are buckled on the outer wall of the cable insulating layer and are fixedly connected through a screw, and the buckled annular bulge is correspondingly clamped into the annular clamping groove.
The polishing head is uniformly distributed with a plurality of groups on the circumference of the first circular tube.
The lateral wall of first pipe on be equipped with two sets of units of holding, two sets of units of holding are put in the both sides of head of polishing separately, every group holds the unit and includes the second slide bar of three circumference equipartitions, the second slide bar radially wears to establish on the lateral wall of first pipe, be equipped with the third spring between the outer end of every second slide bar and the first pipe outer wall, a gyro wheel is installed to the inner of every second slide bar, under the effect of third spring, the gyro wheel compresses tightly on the outer wall of cable insulation layer and can follow the cable circumference and roll.
Each end of each polishing head is coaxially fixed with a limiting wheel, the diameter of each limiting wheel is smaller than that of the large end of each polishing head, and when the limiting wheels at the two ends are in contact with the insulating layer, the polishing heads cannot move towards the axis of the cable.
According to the invention, the clamping unit and the annular clamping groove are matched to bear the axial pulling force of the cable, so that the cable joint can be prevented from being disconnected, the joint can be effectively and stably jointed for a long time without falling off, and the failure rate of the joint is greatly reduced.
Drawings
Fig. 1 is a left side view of the sharpening unit.
Fig. 2 is a front sectional view of the inside of the wear groove unit.
FIG. 3 is a front cross-sectional view of the present invention when the clamping unit of the first embodiment is used.
FIG. 4 is a left side view of the present invention when the clamping unit of the first embodiment is used.
FIG. 5 is a front cross-sectional view of the present invention when the card-connecting unit according to the second embodiment is used.
FIG. 6 is a left side view of the present invention when the card-connecting unit according to the second embodiment is used.
Detailed Description
The following detailed description of the embodiments of the invention refers to the accompanying drawings.
The groove grinding device comprises a groove grinding unit and a connecting unit, wherein the groove grinding unit comprises a first circular tube 1, a radial first sliding rod 2 penetrates through the side wall of the first circular tube 1, a first spring 3 is arranged between the outer end of the first sliding rod 2 and the outer wall of the first circular tube 1, a rotatable conical grinding head 4 is arranged at the inner end of the first sliding rod 2, the axis of the grinding head 4 is parallel to the axis of the first circular tube 1, and the grinding head 4 is connected with a driving motor 5; when the first round pipe 1 is sleeved on an insulating layer of a cable, under the action of the first spring 3, the polishing head 4 presses the outer wall of the insulating layer, the driving motor 5 is started to drive the polishing head 4 to rotate, the first round pipe 1 is rotated at the same time, and the polishing head 4 polishes an annular clamping groove 6 with a wedge-shaped section on the insulating layer; the connecting unit comprises a second round pipe 7 and two third round pipes 8, two radial compression screws 9 are mounted on the side wall of the second round pipe 7, the two compression screws 9 are symmetrically arranged along the axial direction, the end parts of the conductors of the two cables to be jointed are inserted into the second round pipe 7 from two ends, and then the compression screws 9 are screwed down to fix the end parts of the conductors in the second round pipe 7; the inner wall of each third circular tube 8 is provided with a clamping unit, after the third circular tubes 8 are sleeved on the insulating layer of the cable, the clamping unit is clamped into the annular clamping groove 6 to axially limit the third circular tubes 8, the side wall of each third circular tube 8 is internally provided with an axial screw rod 10, each end of the second circular tube 7 is provided with an axial threaded hole 11, and the end parts of the screw rods 10 extend out of the third circular tubes 8 and can be screwed into the threaded holes 11 at the end parts of the second circular tubes 7; before the conductor core of fixed cable breaks, establish two third pipes 8 respectively on the insulating layer at conductor core broken rear, then insert two conductor broken ends in second pipe 7 and fixed, screw hole 11 with the screw rod 10 tip screw in second pipe 7 tip on the third pipe 8 of both sides is interior and taut again, be connected two second pipes 7 and third pipe 8 fixedly, the joint unit carries out the axial with 6 cooperations of ring groove to the cable spacing, avoid the conductor tip to pull out in the second pipe 7.
First embodiment of the clamping unit: the clamping unit comprises a radial mounting hole 12 formed in the inner wall of the third circular tube 8, an elastic clamping block 13 is arranged in the mounting hole 12, a second spring 14 is arranged at the outer end of the elastic clamping block 13, the inner end of the elastic clamping block 13 is wedge-shaped, and under the action of the second spring 14, the inner end of the elastic clamping block 13 can be clamped into the annular clamping groove 6.
In order to avoid the elastic clamping block 13 from falling off from the mounting hole 12, the diameter of the inner port of the mounting hole 12 is reduced compared with the diameter of the hole body, the inner end of the elastic clamping block 13 is smaller than the outer end, the inner end extends out of the inner port of the mounting hole 12, and after the elastic clamping block 13 and the second spring 14 are installed into the mounting hole 12 from the outer port of the mounting hole 12, the outer end of the mounting hole 12 is screwed into a plug 15 for plugging.
Second embodiment of the clamping unit: the clamping unit is an annular protrusion 16 arranged on the inner wall of the third circular tube 8, the cross section of the annular protrusion 16 is the same as that of the annular clamping groove 6, and the annular protrusion 16 is clamped into the annular clamping groove 6 for axial limiting.
Because annular bulge 16 can not be deformed, consequently the unable cover of integral third pipe 8 is on the insulating layer of cable, consequently third pipe 8 divide into same two parts along the axis, two parts lock is connected fixedly at cable insulating layer outer wall and with a screw 17, annular bulge 16 corresponds the card and goes into in annular groove 6 after the lock.
The polishing heads 4 are uniformly distributed on the circumference of the first circular tube 1, so that the groove polishing efficiency can be improved.
The lateral wall of first pipe 1 on be equipped with two sets of units of holding, two sets of units of holding are put in the both sides of head 4 respectively, every group holds the unit and includes the second slide bar 18 of three circumference equipartitions, second slide bar 18 radially wears to establish on the lateral wall of first pipe 1, be equipped with third spring 19 between the outer end of every second slide bar 18 and the 1 outer wall of first pipe, gyro wheel 20 is installed to the inner of every second slide bar 18, under the effect of third spring 19, gyro wheel 20 compresses tightly on the outer wall of cable insulation layer and can follow the cable circumference and roll, two sets of units of holding hold the cable and support first pipe 1, and make first pipe 1 can rotate around the axis.
Each end of each polishing head 4 is coaxially fixed with a limiting wheel 21, the diameter of each limiting wheel 21 is smaller than the diameter of the large end of each polishing head 4, and when the limiting wheels 21 at the two ends are in contact with the insulating layer, the polishing heads 4 cannot move towards the axis of the cable, so that the insulating layer is prevented from being abraded, or the abrasion grooves are too deep, so that the strength of the annular clamping grooves 6 is prevented from being influenced when the axial tension is borne.
When the invention is used for jointing large-diameter cables, firstly, a skinning knife is used for peeling off the skin insulating layer, the metal mesh shielding layer and the like at the end parts of two cables to be jointed to expose the insulating layer close to the conductor, then the insulating layer is peeled off a broken end leaking out of the conductor, then a groove grinding unit is sleeved at the end part of the exposed insulating layer close to the conductor, under the action of a third spring 19, rollers 20 of two groups of holding units support the first circular tube 1 by supporting the insulating layer, under the action of the first spring 3, the large end of a grinding head 4 is pressed on the insulating layer, a driving motor 5 of the grinding head 4 is started, the first circular tube 1 is rotated, the grinding head 4 grinds the insulating layer, meanwhile, under the action of the first spring 3, the grinding depth is gradually deepened until limiting wheels 21 at the two ends of the grinding head 4 are contacted with the insulating layer, the annular clamping groove 6 at the position is ground, the groove grinding unit is moved a distance along the axial direction of the cable to continue to grind the next annular clamping groove 6, the moving distance is equal to the distance between the clamping units in the third round pipe 8 until the annular clamping grooves 6 with the same number as the clamping units in the third round pipe 8 are ground.
After the annular clamping grooves 6 on the two cable ends are ground, two third circular tubes 8 are respectively arranged on the two cable ends; if the clamping unit is in the structure of the first embodiment, the third circular tube 8 can be directly sleeved on the insulating layer because the inner end of the elastic clamping block 13 is wedge-shaped, and the third circular tube 8 cannot be pulled out of the insulating layer after the elastic clamping block 13 is clamped in the annular clamping groove 6; if the clamping unit is the structure of the second embodiment, the two parts of the third round pipe 8 are buckled on the insulating layer, the annular protrusion 16 is correspondingly clamped in the annular clamping groove 6, and then the two parts are screwed and fixed by the screw 17.
After two third pipes 8 all established on the cable end, insert the second pipe 7 with the conductor end of two cables from the both ends of second pipe 7 in, thereby it fixes the conductor head in second pipe 7 to screw up two conductor heads with housing screw 9, then rotate third pipe 8 and make screw rod 10 on the third pipe 8 adjust well with the screw hole 11 of 7 tip of second pipe, it makes screw rod 10 screw in the screw hole 11 of 7 tip of second pipe and will be taut with second pipe 7 and third pipe 8 gradually to rotate screw rod 10 at both ends, the axial that receives of cable is dragged the power and is born by multiunit ring groove 6 and joint unit, and can not drag the conductor head, can avoid the conductor head to deviate from in the second pipe 7.
After the second round pipe 7 and the third round pipe 8 are installed, conventional operations such as winding, wrapping, glue pouring and sealing can be conducted outwards layer by layer.
According to the invention, the annular clamping groove 6 is formed on the insulating layer by grinding, the axial pulling force of the cable is borne by the clamping unit on the third circular tube 8 and the annular clamping groove 6 in a matching manner, and the two third circular tubes 8 and the cable are pulled towards the middle by the screw 10 so as to release the pre-pulling force when the conductor head is fixed, so that the conductor head is in a loose and compressed state, the phenomenon that the conductor head is pulled away from the second circular tube 7 by the axial pulling force generated when the cable is subjected to dead weight or shaking by wind power, earthquake and the like to break the cable joint is avoided, the long-term effective stable joint at the joint can be ensured, and the failure rate at the joint is greatly reduced.
Claims (9)
1. The large-diameter cable joint is characterized by comprising a grinding groove unit and a connecting unit, wherein the grinding groove unit comprises a first circular tube (1), a radial first sliding rod (2) penetrates through the side wall of the first circular tube (1), a first spring (3) is arranged between the outer end of the first sliding rod (2) and the outer wall of the first circular tube (1), a rotatable conical grinding head (4) is arranged at the inner end of the first sliding rod (2), the axis of the grinding head (4) is parallel to the axis of the first circular tube (1), and the grinding head (4) is connected with a driving motor (5); when the first round pipe (1) is sleeved on an insulating layer of a cable, under the action of the first spring (3), the polishing head (4) presses the outer wall of the insulating layer, the driving motor (5) is started to drive the polishing head (4) to rotate, the first round pipe (1) is rotated at the same time, and the polishing head (4) polishes an annular clamping groove (6) with a wedge-shaped section on the insulating layer; the connecting unit comprises a second round pipe (7) and two third round pipes (8), two radial compression screws (179) are mounted on the side wall of the second round pipe (7), and the two compression screws (179) are symmetrically arranged along the axial direction; the inner wall of every third pipe (8) all is equipped with the joint unit, third pipe (8) cover back on the insulating layer of cable, joint unit card goes into to carry out the axial spacing to third pipe (8) in ring groove (6), all be equipped with axial screw rod (10) in the lateral wall of every third pipe (8), axial screw hole (11) have all been opened at every end of second pipe (7), but screw rod (10) tip stretch out the screw hole (11) of the outer just screw in second pipe (7) tip of third pipe (8).
2. The large-diameter cable joint according to claim 1, wherein the ring-shaped clamping grooves (6) and the clamping units are axially arranged in multiple groups, and the distance between the ring-shaped clamping grooves (6) is equal to the distance between the clamping units.
3. The large-diameter cable joint according to claim 1, wherein the clamping unit comprises a radial mounting hole (12) formed in the inner wall of the third circular tube (8), an elastic clamping block (13) is arranged in the mounting hole (12), a second spring (14) is arranged at the outer end of the elastic clamping block (13), the inner end of the elastic clamping block (13) is wedge-shaped, and the inner end of the elastic clamping block (13) can be clamped into the annular clamping groove (6) under the action of the second spring (14).
4. A large-diameter cable joint as claimed in claim 4, wherein the diameter of the inner port of the mounting hole (12) is smaller than that of the hole body, the inner end of the elastic latch (13) is smaller than the outer end, the inner end extends out of the inner port of the mounting hole (12), and the outer end of the mounting hole (12) is screwed with a screw plug (15).
5. The large-diameter cable joint according to claim 1, wherein the clamping unit is an annular protrusion (16) arranged on the inner wall of the third circular tube (8), the cross section of the annular protrusion (16) is the same as that of the annular clamping groove (6), and the annular protrusion (16) is clamped in the annular clamping groove (6) for axial limiting.
6. The large-diameter cable joint according to claim 1, wherein the third circular tube (8) is divided into two identical parts along the axis, the two parts are buckled on the outer wall of the cable insulation layer and are connected and fixed by a screw (17), and the buckled annular protrusion (16) is correspondingly clamped into the annular clamping groove (6).
7. A large-diameter cable joint as claimed in claim 1, wherein the polishing head (4) is provided with a plurality of groups uniformly distributed on the circumference of the first circular tube (1).
8. The large-diameter cable joint according to claim 1, wherein two groups of holding units are arranged on the side wall of the first circular tube (1), the two groups of holding units are respectively arranged on two sides of the polishing head (4), each group of holding unit comprises three second sliding rods (18) which are uniformly distributed circumferentially, the second sliding rods (18) radially penetrate through the side wall of the first circular tube (1), a third spring (19) is arranged between the outer end of each second sliding rod (18) and the outer wall of the first circular tube (1), a roller (20) is arranged at the inner end of each second sliding rod (18), and under the action of the third spring (19), the roller (20) is tightly pressed on the outer wall of the cable insulation layer and can roll along the circumference of the cable.
9. A large-diameter cable joint according to claim 1, wherein each end of each polishing head (4) is coaxially fixed with a limiting wheel (21), the diameter of the limiting wheel (21) is smaller than that of the large end of the polishing head (4), and when the limiting wheels (21) at the two ends are in contact with the insulating layer, the polishing head (4) cannot move towards the cable axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210150135.0A CN114498533B (en) | 2022-02-18 | 2022-02-18 | Large-diameter cable connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210150135.0A CN114498533B (en) | 2022-02-18 | 2022-02-18 | Large-diameter cable connector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114498533A true CN114498533A (en) | 2022-05-13 |
| CN114498533B CN114498533B (en) | 2024-03-12 |
Family
ID=81482620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210150135.0A Active CN114498533B (en) | 2022-02-18 | 2022-02-18 | Large-diameter cable connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114498533B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2360804A1 (en) * | 2009-12-02 | 2011-08-24 | Nexans | Assembly for linking two energy cables |
| CN108538486A (en) * | 2018-05-21 | 2018-09-14 | 安徽国电电缆集团有限公司 | A kind of wind energy power cable that resistance to twisting can be good |
| CN209805396U (en) * | 2019-07-01 | 2019-12-17 | 郑州工业应用技术学院 | Cable joint of quick installation for electric power transportation |
| CN209804918U (en) * | 2019-05-07 | 2019-12-17 | 山东泰开电缆有限公司 | Insulating tubular busbar end connecting device based on spring pieces |
| CN110635281A (en) * | 2019-09-25 | 2019-12-31 | 国网山东省电力公司济南市历城区供电公司 | One drags many types electric power connecting device |
| CN212849004U (en) * | 2020-10-15 | 2021-03-30 | 河南简跃电气设备有限公司 | Cable winding joint |
| CN213660026U (en) * | 2020-11-26 | 2021-07-09 | 杭州普天乐电缆有限公司 | External cable protection sleeve with insulating layer and shielding layer |
| CN215674104U (en) * | 2021-06-15 | 2022-01-28 | 长垣盾安节能热力有限公司 | Novel heat insulation pipeline for remote heat supply |
-
2022
- 2022-02-18 CN CN202210150135.0A patent/CN114498533B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2360804A1 (en) * | 2009-12-02 | 2011-08-24 | Nexans | Assembly for linking two energy cables |
| CN108538486A (en) * | 2018-05-21 | 2018-09-14 | 安徽国电电缆集团有限公司 | A kind of wind energy power cable that resistance to twisting can be good |
| CN209804918U (en) * | 2019-05-07 | 2019-12-17 | 山东泰开电缆有限公司 | Insulating tubular busbar end connecting device based on spring pieces |
| CN209805396U (en) * | 2019-07-01 | 2019-12-17 | 郑州工业应用技术学院 | Cable joint of quick installation for electric power transportation |
| CN110635281A (en) * | 2019-09-25 | 2019-12-31 | 国网山东省电力公司济南市历城区供电公司 | One drags many types electric power connecting device |
| CN212849004U (en) * | 2020-10-15 | 2021-03-30 | 河南简跃电气设备有限公司 | Cable winding joint |
| CN213660026U (en) * | 2020-11-26 | 2021-07-09 | 杭州普天乐电缆有限公司 | External cable protection sleeve with insulating layer and shielding layer |
| CN215674104U (en) * | 2021-06-15 | 2022-01-28 | 长垣盾安节能热力有限公司 | Novel heat insulation pipeline for remote heat supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114498533B (en) | 2024-03-12 |
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