CN211127032U - Sag adjusting device and tower - Google Patents
Sag adjusting device and tower Download PDFInfo
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- CN211127032U CN211127032U CN201921758450.1U CN201921758450U CN211127032U CN 211127032 U CN211127032 U CN 211127032U CN 201921758450 U CN201921758450 U CN 201921758450U CN 211127032 U CN211127032 U CN 211127032U
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- fixing mechanism
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- 230000007246 mechanism Effects 0.000 claims abstract description 190
- 238000013021 overheating Methods 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000036319 strand breaking Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a sag adjusting device and shaft tower relates to strain clamp field, include: the wire fixing mechanism and the fixing mechanism; the wire fixing mechanism is connected with the fixing mechanism through an adjusting mechanism; the wire fixing mechanism is used for fixing a cable; the adjusting mechanism is used for adjusting the distance between the wire fixing mechanism and the fixing mechanism. The problem that faults such as virtual connection and disconnection of the wire are easily caused by local overheating of the wire (cable) due to uneven stress of the wire (cable) caused by the old strain clamp and the problem that the sag of the wire (cable) cannot be adjusted due to the fact that the old strain clamp only plays a role in fixing the wire is solved.
Description
Technical Field
The utility model relates to a strain clamp field, a sag adjusting device and shaft tower specifically says so, especially a novel adjustable strain clamp of 6-10KV overhead line or cable common use instrument (gold utensil).
Background
The sag of the electric wire is also called sag, and is a sag phenomenon after the conducting wire and the lightning conductor of the overhead line or the cable are erected. Generally, when the transmission distance is long, a slight sag is formed due to the self weight of the conductor, so that the conductor is in the shape of a catenary. The wire has the maximum sag, and when the maximum sag is reached, the wire has the minimum distance to the ground, and if the wire meets the requirement on the distance to the ground during the maximum sag, the wire can meet the requirement under other meteorological conditions.
That is, the sag of the wire is the height of the falling arc of the wire, which must be within a certain range, otherwise the wire or cable may be short-circuited due to the swinging of the wire in the strong wind or under certain natural conditions.
In a common tool for 6-10KV overhead lines or cables, an old-fashioned strain clamp is a hardware tool for fixing a wire on the overhead lines or the cables and a strain tower of a substation in an electric power system, and the principle of the old-fashioned strain clamp is that the wire is fixed by means of extrusion of vertical pressure and the clamp of a plurality of U-shaped bolts and shoe-shaped gold ingots. The old strain clamp is a commonly-used hardware fitting for a line or a cable, is used for fixing the end of a wire, and is combined with an insulator string group to be hung on a tower so as to bear the tension of the wire, reduce the sag of the wire and play an important role in the safe operation of an electric power system.
Disclosure of Invention
In view of this, the utility model provides a sag adjusting device and shaft tower to solve old-fashioned strain clamp and make the atress of wire (cable) inhomogeneous, arouse that wire (cable) strand loosing, strand breaking, make wire (cable) local overheat cause the problem of trouble such as the wire virtual connection broken string easily to and old-fashioned strain clamp only plays the fixed action of wire, can not adjust the problem of the sag of wire (cable).
In a first aspect, the utility model provides a degree of relaxation adjusting device, include:
the wire fixing mechanism and the fixing mechanism;
the wire fixing mechanism is connected with the fixing mechanism through an adjusting mechanism;
the wire fixing mechanism is used for fixing a cable;
the adjusting mechanism is used for adjusting the distance between the wire fixing mechanism and the fixing mechanism.
Preferably, the thread fixing mechanism includes: a wire fixing main body;
the wire fixing main body is provided with a groove, and the cable is fixed in the groove.
Preferably, the groove includes: the wire inlet groove and the wire return groove; the wire inlet groove is arranged at the lower side of the wire fixing main body, and the wire return groove is arranged at the upper side of the wire fixing main body; one end of the cable sequentially passes through the wire inlet groove and the wire inlet groove.
Preferably, the left side or the right side of the wire fixing main body is provided with a guide groove; and/or
The left side or the right side of the wire fixing main body is provided with a convex structure, and the convex structure is provided with a guide groove;
one end of the cable sequentially passes through the wire inlet groove, the guide groove and the wire return groove.
Preferably, the sag adjustment device further comprises:
a lower pressing plate;
the lower pressing plate is used for further fixing the wire fixing main body.
Preferably, the lower pressing plate is provided with a through hole, and the wire fixing main body is provided with a pressing plate nut hole;
the through hole and the pressing plate nut hole are used for connecting the lower pressing plate and the wire fixing main body.
Preferably, the wire fixing main body is provided with a pressing plate nut limiting groove, and the pressing plate nut hole is formed in the pressing plate nut limiting groove.
Preferably, the adjustment mechanism comprises: a fixed mechanism connecting part and a distance fixing mechanism;
the fixing mechanism is connected with the adjusting mechanism through the fixing mechanism connecting part, and the distance between the fixing mechanism and the line fixing mechanism is fixed through the distance fixing mechanism; and/or the adjustment mechanism, comprising: a first adjustment mechanism and a second adjustment mechanism;
the first adjusting mechanism and the second adjusting mechanism are protruding structures on the upper side and the lower side of the wire fixing mechanism; the first adjusting mechanism and the second adjusting mechanism are used for adjusting the distance between the wire fixing mechanism and the fixing mechanism; and/or the fixing mechanism is of a U-shaped structure, and the opening of the U-shaped structure is connected with the wire fixing mechanism through the adjusting mechanism.
Preferably, the fixing mechanism connecting portion includes: a first adjustment mechanism through hole and a second adjustment mechanism through hole;
the distance fixing mechanism includes: an adjusting nut and a limiting nut; the first adjusting mechanism comprises a first adjusting mechanism main body and the limiting nut, wherein the first adjusting mechanism is provided with a first adjusting mechanism through hole;
the second adjusting mechanism comprises a second adjusting mechanism main body and the adjusting nut, and the second adjusting mechanism is provided with a second adjusting mechanism through hole; the adjusting nut and the limiting nut are used for adjusting the distance between the wire fixing mechanism and the fixing mechanism.
In a second aspect, the present invention provides a tower, comprising: the sag adjusting device is characterized in that:
one end of the fixing mechanism is fixed on the tower, and the other end of the fixing mechanism is connected with the wire fixing mechanism through the adjusting mechanism.
The utility model discloses following beneficial effect has at least:
the utility model provides a sag adjusting device and shaft tower to it is inhomogeneous to solve the atress that old-fashioned strain clamp made wire (cable), arouses that wire (cable) strand loosing, disconnected strand, makes wire (cable) local overheat cause the problem of trouble such as the wire virtual connection broken string easily, and old-fashioned strain clamp only plays the fixed action of wire, can not adjust the problem of the sag of wire (cable).
The utility model discloses convenient and fast more when adjusting wire (cable) sag has shortened the work efficiency that operating time improves.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a sag adjustment device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lower pressing plate according to an embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for parts not described in detail, those skilled in the art can fully understand the present invention.
Furthermore, those skilled in the art will appreciate that the drawings are provided for purposes of illustrating the objects, features, and advantages of the invention and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Nut and shoe-shaped gold ingot are more when old-fashioned strain clamp installs, lead to the installation to adjust more time-consuming, and the skew takes place easily in the shoe-shaped gold ingot position, makes the atress of wire (cable) inhomogeneous, arouses that the wire strand that looses, strand breaks, makes (cable) local overheat cause the wire to connect trouble such as broken string easily. And the old strain clamp only plays a role in fixing the wire, and the adjustment of the sag of the cable needs to be carried out by means of a double-hook wire clamping device.
Fig. 1 is a schematic structural diagram of a sag adjustment device according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a lower pressing plate according to an embodiment of the present invention. As shown in fig. 1 and 2, a sag adjustment device includes: the wire fixing mechanism 1 and the fixing mechanism; the wire fixing mechanism is connected with the fixing mechanism 1 through the adjusting mechanism; the wire fixing mechanism is used for fixing the cable; and the adjusting mechanism is used for adjusting the distance between the wire fixing mechanism and the fixing mechanism 1. The problem that faults such as virtual connection and disconnection of the wire are easily caused by local overheating of the wire (cable) due to uneven stress of the wire (cable) caused by the old strain clamp and the problem that the sag of the wire (cable) cannot be adjusted due to the fact that the old strain clamp only plays a role in fixing the wire is solved.
Specifically, one end of the cable is fixed, the other end of the cable is fixed on the cable fixing mechanism, the adjusting mechanism adjusts the distance between the cable fixing mechanism and the fixing mechanism, namely, the sag of the cable can be adjusted, if the adjusting mechanism drives the cable fixing mechanism to move towards one side of the fixing mechanism 1, the cable fixing mechanism drives the cable to move towards one side of the fixing mechanism 1, the cable is tensioned, and at the moment, the sag of the cable is reduced; if the adjusting mechanism drives the wire fixing mechanism to move towards the other side of the fixing mechanism 1, the wire fixing mechanism drives the cable to move towards the other side of the fixing mechanism 1, the cable is loosened, and the looseness of the cable is increased at the moment.
Furthermore, both ends of the cable are respectively provided with a wire fixing mechanism, and both ends of the cable are respectively fixed on 2 wire fixing mechanisms on the wire fixing mechanism, the sag of the cable can be adjusted by adjusting the distance between the 2 wire fixing mechanisms through an adjusting mechanism, and the principle is the same as the above description.
In fig. 1 and 2, a wire fixing mechanism includes: a thread fixing main body 4; the wire fixing main body 4 is provided with a groove, and the cable is fixed in the groove.
In fig. 1 and 2, the groove on the wire fixing body 4 comprises: a wire inlet groove 5 and a wire return groove 8; the wire inlet groove 5 is arranged at the lower side of the wire fixing main body 4, and the wire return groove 8 is arranged at the upper side of the wire fixing main body 4; one end of the cable passes through the wire inlet groove 5 and the wire inlet groove 5 in sequence. Specifically, the cable is crimped inside the inlet duct 5 and the return duct 8, and the outer wall of the cable is in contact with the inner walls of the inlet duct 5 and the return duct 8.
In fig. 1 and 2, the left or right side of the wire fixing body 4 has a guide groove 2; and/or the left side or the right side of the thread fixing main body 4 is provided with a convex structure, and the convex structure is provided with a guide groove 2; one end of the cable passes through the wire inlet groove 5, the guide groove 2 and the wire return groove 8 in sequence. Specifically, the cable is crimped inside the wire inlet groove 5, the wire return groove 8, and the guide groove 2, and the outer wall of the cable is in contact with the inner walls of the wire inlet groove 5, the wire return groove 8, and the guide groove 2.
In fig. 1 and 2, a sag adjustment device further comprises: a lower press plate 10; and the lower pressing plate 10 is used for further fixing the thread fixing main body 4. Specifically, only part of the cable is crimped on the inner sides of the wire inlet groove 5, the wire return groove 8 and the guide groove 2, the wire inlet groove 5 and the wire return groove 8 are groove bodies on one side of the wire fixing body 4, the cable may be separated or fall off from the wire inlet groove 5 and the wire return groove 8, and the wire fixing body 4 needs to be further fixed through the lower pressing plate 10.
In fig. 1 and 2, the lower press plate 10 has a lower press plate wire inlet slot and a lower press plate wire return slot, part of the outer wall of the cable is in the wire inlet slot 5 and the wire return slot 8, and the other part of the outer wall of the cable is in the lower press plate wire inlet slot and the lower press plate wire return slot. The wire inlet groove 5 and the pressing plate wire inlet groove wrap the wire inlet of the cable at the same time, and the wire return groove 8 and the pressing plate wire return groove wrap the wire outlet of the cable at the same time.
In fig. 1 and 2, the lower pressing plate 10 is provided with a through hole, and the wire fixing body 4 is provided with a pressing plate nut hole 7; and the through hole and the pressing plate nut hole 7 are used for connecting the lower pressing plate 10 and the wire fixing main body 4. Specifically, when the lower pressing plate 10 is buckled on the wire fixing main body 4, the wire inlet groove 5 and the pressing plate wire inlet groove simultaneously wrap the wire inlet of the cable, the wire outlet groove 8 and the lower pressing plate wire return groove simultaneously wrap the wire outlet of the cable, and at the moment, the lower pressing plate 10 is fixed on the wire fixing main body 4 through a screw passing through the pressing plate nut hole 7 and a through hole on the lower pressing plate 10.
In fig. 1 and 2, the wire fixing body 4 is provided with a pressing plate nut limiting groove 6, and a pressing plate nut hole 7 is arranged in the pressing plate nut limiting groove 6.
In fig. 1 and 2, an adjustment mechanism comprising: a fixed mechanism connecting part and a distance fixing mechanism; the fixing mechanism 1 is connected with the adjusting mechanism through a fixing mechanism connecting part, and the distance between the fixing mechanism 1 and the wire fixing mechanism is fixed through a distance fixing mechanism.
In fig. 1 and 2, an adjustment mechanism comprising: a first adjustment mechanism and a second adjustment mechanism; the first adjusting mechanism and the second adjusting mechanism are protruding structures on the upper side and the lower side of the wire fixing mechanism; the first adjusting mechanism and the second adjusting mechanism are used for adjusting the distance between the wire fixing mechanism and the fixing mechanism 1.
In fig. 1 and 2, the fixing mechanism 1 is a U-shaped structure, and an opening of the U-shaped structure is connected with the wire fixing mechanism through an adjusting mechanism.
In fig. 1 and 2, a fixing mechanism connecting portion includes: a first adjustment mechanism through hole and a second adjustment mechanism through hole; distance fixed establishment includes: an adjusting nut 3 and a limiting nut 9; the first adjusting mechanism comprises a first adjusting mechanism main body and a limiting nut 9, wherein a first adjusting mechanism through hole is formed in the first adjusting mechanism; the second adjusting mechanism comprises a second adjusting mechanism main body and an adjusting nut 3, and a second adjusting mechanism through hole is formed in the second adjusting mechanism; and the adjusting nut 3 and the limiting nut 9 are used for adjusting the distance between the wire fixing mechanism and the fixing mechanism 1.
With reference to fig. 1 and 2, the assembly process of the present invention is briefly described: the cable is pressed on the inner sides of the wire inlet groove 5, the wire return groove 8 and the guide groove 2, the lower pressing plate 10 is pressed on the wire fixing main body 4, and the screw penetrates through the pressing plate nut hole 7 and the through hole in the lower pressing plate 10 to fix the lower pressing plate 10 on the wire fixing main body 4. Fixing mechanism 1 can choose U type structure for use, U type structure opening part passes through adjustment mechanism and is connected with solid line mechanism, specifically speaking, the upper and lower both sides of solid line mechanism have first adjustment mechanism through-hole and second adjustment mechanism respectively, fixing mechanism 1's U type arm has the external screw thread respectively, 2U type arms of fixing mechanism 1 pass first adjustment mechanism through-hole and second adjustment mechanism through-hole respectively, when the degree of speeding of cable is adjusted to setting for the degree of speeding, tighten adjusting nut 3 and stop nut 9 respectively, the distance between solid line mechanism and the fixing mechanism 1 is fixed this moment, the degree of speeding of cable also can not change.
And simultaneously, the utility model also provides a shaft tower, include: as for the sag adjusting device, one end of the fixing mechanism is fixed on the tower, and the other end of the fixing mechanism is connected with the wire fixing mechanism through the adjusting mechanism.
The utility model aims to solve the technical problem, be exactly to prior art exist not enough, and provide an adjustable novel strain clamp (promptly, the utility model provides a sag adjustment device), adjustable novel strain clamp is with wire (cable) from the inlet wire groove 5 of solidus mechanism through guiding groove 2 get back to return-wire groove 8, reinstallate head plate 10, utilize fastening bolt or screw to compress tightly 10 fixed wires (cable) of head plate. When the sag of the conducting wire (cable) is adjusted, the position of the nut (the adjusting nut 3 and the limiting nut 9) of the U-shaped ring can be adjusted to adjust the sag of the conducting wire (cable).
The utility model discloses simple to operate easy operation has still increased the function of adjusting the wire sag except the basic function of fixed wire. The self-regulation of the conductor sag can be realized without a double-hook wire clamping device according to the condition of a line or a cable. The time for adjusting the sag of the lead is shortened, and the working efficiency is effectively improved. In addition for the strain clamp of old-fashioned, the utility model has the advantages of it is following: (1) the utility model has high strength and reliable grip strength; (2) the utility model has uniform stress distribution to the wire, does not damage the wire, improves the anti-vibration capability and greatly prolongs the service life of the wire; (3) the utility model discloses the installation is simple, convenient operation, and the construction of being convenient for can shorten operating time greatly, improves work efficiency. (4) The utility model discloses corrosion resistance is good, chooses for use the quality material, guarantees the utility model discloses the ability that has stronger anti electrochemical corrosion.
The utility model discloses in the practical application of 6-10KV overhead line or cable, the installation is simple, convenient operation. The utility model discloses it is big with the area of contact of wire, stress distribution is even, does not harm the wire, can not take place the wire strand loosing, strand breaking, makes the local overheat of wire cause the wire fault such as disconnected line of virtual connection easily. When the split-pole type phase-locked loop is applied to the branch pole, the middle-phase hardware fitting of the lead, the lead and the side-phase lead have enough safety distance, and faults such as quick-break tripping and the like caused by insufficient safety distance of the middle-phase and the side-phase are effectively avoided. The utility model discloses convenient and fast more when adjusting the wire sag has shortened the work efficiency that operating time improves.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions, modifications, etc. can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A sag adjustment device, comprising:
the wire fixing mechanism and the fixing mechanism (1);
the wire fixing mechanism is connected with the fixing mechanism (1) through an adjusting mechanism;
the wire fixing mechanism is used for fixing a cable;
the adjusting mechanism is used for adjusting the distance between the wire fixing mechanism and the fixing mechanism (1).
2. The sag adjustment device according to claim 1, wherein:
the solidus mechanism includes: a thread fixing main body (4);
the wire fixing main body (4) is provided with a groove, and the cable is fixed in the groove.
3. The sag adjustment device according to claim 2, wherein:
the groove, including: the wire inlet groove (5) and the wire return groove (8); the wire inlet groove (5) is arranged at the lower side of the wire fixing main body (4), and the wire return groove (8) is arranged at the upper side of the wire fixing main body (4); one end of the cable sequentially passes through the wire inlet groove (5) and the wire return groove (8).
4. The sag adjustment device according to claim 3, wherein:
the left side or the right side of the wire fixing main body (4) is provided with a guide groove (2); and/or
The left side or the right side of the wire fixing main body (4) is provided with a convex structure, and the convex structure is provided with a guide groove (2);
one end of the cable sequentially passes through the wire inlet groove (5), the guide groove (2) and the wire inlet groove (5).
5. The sag adjustment device according to any one of claims 1 to 4, further comprising:
a lower platen (10);
the lower pressing plate (10) is used for further fixing the thread fixing main body (4).
6. The sag adjustment device according to claim 5, wherein:
the lower pressing plate (10) is provided with a through hole, and the wire fixing main body (4) is provided with a pressing plate nut hole (7);
the through hole and the pressing plate nut hole (7) are used for connecting the lower pressing plate (10) and the wire fixing main body (4).
7. The sag adjustment device according to claim 6, wherein:
the wire fixing main body (4) is provided with a pressing plate nut limiting groove (6), and the pressing plate nut hole (7) is formed in the pressing plate nut limiting groove (6).
8. The sag adjusting apparatus according to any one of claims 1 to 4, 6 and 7, wherein:
the adjustment mechanism includes: a fixed mechanism connecting part and a distance fixing mechanism;
the fixing mechanism is connected with the adjusting mechanism through the fixing mechanism connecting part, and the distance between the fixing mechanism (1) and the thread fixing mechanism is fixed through the distance fixing mechanism; and/or
The adjustment mechanism includes: a first adjustment mechanism and a second adjustment mechanism;
the first adjusting mechanism and the second adjusting mechanism are protruding structures on the upper side and the lower side of the wire fixing mechanism; the first adjusting mechanism and the second adjusting mechanism are used for adjusting the distance between the wire fixing mechanism and the fixing mechanism (1); and/or
The fixing mechanism (1) is of a U-shaped structure, and the opening of the U-shaped structure is connected with the wire fixing mechanism through the adjusting mechanism.
9. The sag adjustment device according to claim 8, wherein:
the fixing mechanism connecting portion includes: a first adjustment mechanism through hole and a second adjustment mechanism through hole;
the distance fixing mechanism includes: an adjusting nut (3) and a limiting nut (9); the first adjusting mechanism comprises a first adjusting mechanism main body and the limiting nut (9), wherein the first adjusting mechanism is provided with a first adjusting mechanism through hole;
the second adjusting mechanism comprises a second adjusting mechanism main body and the adjusting nut (3), and the second adjusting mechanism is provided with a second adjusting mechanism through hole; the adjusting nut (3) and the limiting nut (9) are used for adjusting the distance between the wire fixing mechanism and the fixing mechanism.
10. A tower, comprising: a sag adjustment device according to any one of claims 1 to 9, wherein:
one end of the fixing mechanism (1) is fixed on a tower, and the other end of the fixing mechanism (1) is connected with the wire fixing mechanism through the adjusting mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921758450.1U CN211127032U (en) | 2019-10-21 | 2019-10-21 | Sag adjusting device and tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921758450.1U CN211127032U (en) | 2019-10-21 | 2019-10-21 | Sag adjusting device and tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211127032U true CN211127032U (en) | 2020-07-28 |
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ID=71699279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921758450.1U Active CN211127032U (en) | 2019-10-21 | 2019-10-21 | Sag adjusting device and tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211127032U (en) |
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2019
- 2019-10-21 CN CN201921758450.1U patent/CN211127032U/en active Active
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Effective date of registration: 20211228 Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Patentee after: Daqing Oilfield Co.,Ltd. Patentee after: PetroChina Company Limited Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 233 South Central Avenue Patentee before: Daqing Oilfield Co.,Ltd. |