Wire lifting device and wire lifting method for 35kV-110kV power transmission line

Abstract

The invention discloses a wire lifting device and method for a 35kV-110kV power transmission line in the field of power maintenance, and the device comprises a wire lifting hook which comprises a hook handle and a hook body. And an expansion plate is arranged on the hook body. The cable lifting device has the advantages that the cable lifting device is more attached to a 35 kV to 110 kV power transmission line through the specially-made cable lifting hook, the power transmission line is not prone to slipping away when inclining too much, the cable lifting stability is ensured, meanwhile, the expansion board makes contact with the power transmission line, the stress area of the power transmission line during cable lifting is increased, the power transmission line is better protected, and the strand breaking phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to the field of power maintenance, in particular to a wire lifting device and a wire lifting method for 35kV to 110kV transmission lines. Background Art

[0002] With the popularization of 35kV and 110kV transmission lines, the maintenance work of 35kV and 110kV transmission lines is frequently carried out. When replacing the straight string insulators on 35kV to 110kV transmission lines, the operators directly use the electric hoist hook to pull the wire, and transfer all the loads on the wire to the pole tower through the electric hoist by winding the hoist, so that the insulator string is relaxed and not stressed, and the insulator is replaced.

[0003] However, when using an electric hoist to pull the conductor, the contact area between the hook and the conductor becomes smaller due to the small size of the electric hoist hook. The conductor may be easily broken when being pulled by the electric hoist hook, and there is even a risk of the conductor breaking, which will seriously affect the maintenance work. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is how to avoid the phenomenon of wire strand breakage during wire lifting.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a wire lifting device for 35kV to 110kV transmission lines, comprising a wire lifting hook including a hook handle and a hook body; an expansion plate is provided on the hook body.

[0008] As a preferred solution of the wire lifting device for 35kV to 110kV power transmission lines described in the present invention, the hook body includes an arc portion and a straight portion, and the straight portion is tangent to one end of the arc portion.

[0009] As a preferred embodiment of the wire lifting device for 35kV to 110kV transmission lines of the present invention, the arc portion is a semicircular structure, the hook handle is tangent to the other end of the arc portion, and the length L1 of the hook handle is greater than the length L2 of the straight portion.

[0010] As a preferred solution of the wire lifting device for 35kV to 110kV power transmission lines described in the present invention, a threaded hole is provided on the hook handle.

[0011] As a preferred solution of the wire lifting device for 35kV to 110kV transmission lines described in the present invention, the width W1 of the extension plate is greater than the width W2 of the hook body, and the lengths of the two sides of the extension plate extending out of the hook body are consistent.

[0012] As a preferred solution of the wire lifting device for 35kV to 110kV power transmission lines described in the present invention, an anti-slip pad is provided on the inner side of the expansion plate.

[0013] As a preferred solution of the wire lifting device for 35kV to 110kV power transmission lines described in the present invention, the length of the hook handle is L1=100mm, and the length of the straight part is L1=35mm.

[0014] As a preferred solution of the wire lifting device for 35kV to 110kV power transmission lines described in the present invention, the width of the expansion plate is W1=65mm, the width of the hook body is consistent with the width of the hook handle, W2=15mm.

[0015] The beneficial effects of the wire lifting device for 35kV to 110kV power transmission lines of the present invention are as follows: the wire lifting device can better fit the 35kV to 110kV power transmission lines through the specially made wire lifting hook, and is not easy to slip away when the power transmission line is tilted too much, thereby ensuring the stability of the wire lifting device; at the same time, the wire lifting device can contact the power transmission line through the expansion plate, thereby increasing the force area of ​​the power transmission line when lifting the wire, thereby better protecting the power transmission line and avoiding the occurrence of broken strands.

[0016] Another object of the present invention is to provide a wire lifting method, which aims to solve the problem of how to determine the traction force required for wire lifting to avoid the phenomenon that the wire cannot be lifted or the wire is broken.

[0017] As a preferred solution of the wire lifting device for 35kV to 110kV transmission lines of the present invention, wherein: the wire lifting hook is connected to the electric hoist of the external traction device;

[0018] The transmission line is placed in the arc portion of the transmission line, and the expansion plate is in contact with the transmission line;

[0019] Determine the vertical load G of the transmission line according to the model of the transmission line, and thus determine the size of the electric hoist traction force F;

[0020] The insulators on the transmission line are relaxed by the traction of the electric hoist so that the insulators can be replaced.

[0021] As a preferred solution of the wire lifting device for 35kV to 110kV transmission lines of the present invention, wherein: the cross-sectional area S of the conductor is measured;

[0022] Determine the vertical spacing ΔL of the conductor V ;

[0023] The vertical load of the conductor G = gSΔL V ;

[0024] The vertical load g of the conductor is the maximum vertical load measured when the conductor is covered with ice;

[0025] When the traction force of the electric hoist F>G, the insulators on the transmission line can be in a relaxed state and the replacement of the insulators can be completed.

[0026] The beneficial effects of the present invention are as follows: the vertical load G of the wire is calculated through various data of the wire, so as to determine the size of the traction force F required for lifting the wire, which is convenient for protecting the wire in the subsequent wire lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0028] Figure 1 A schematic structural diagram of a wire lifting device for a 35kV to 110kV transmission line according to an embodiment of the present invention;

[0029] Figure 2 A front view of a wire lifting device for a 35kV to 110kV transmission line according to an embodiment of the present invention;

[0030] Figure 3 A side view of a wire lifting device for a 35kV to 110kV transmission line according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a wire lifting device for a 35kV to 110kV transmission line according to an embodiment of the present invention;

[0032] Figure 5 A flow chart of a wire lifting method for a 35kV to 110kV transmission line according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0036] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] Example 1

[0038] Reference Figure 1 The present embodiment provides a wire lifting device for 35kV to 110kV transmission lines, including a wire lifting hook 100. During the wire lifting process, the wire lifting hook 100 is in direct contact with the transmission line. The wire lifting hook 100 includes a hook handle 101 and a hook body 102. The hook handle 101 is linear and connected to an external traction device electric hoist; the hook body 102 is arc-shaped, and the transmission line is embedded in the arc-shaped part of the hook body 102.

[0039] Specifically, the expansion board 103 is similar in shape to the hook body 102 . When connected, the outer wall of the expansion board 103 is in close contact with the inner wall of the hook body 102 . After the power transmission line is embedded in the hook body 102 , it will directly contact the expansion board 103 .

[0040] Preferably, the size of the wire lifting hook 100 is designed according to the size and type of the transmission line. Therefore, when the 35kV to 110kV transmission line is connected through the wire lifting hook 100, the wire lifting hook is not easy to slip away, which can ensure the safety of the maintenance work.

[0041] Example 2

[0042] Reference Figure 1-3, which is the second embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that a threaded hole 101a is provided on the top of the hook handle 101, and the electric hoist hook is connected to the wire lifting hook 100 through the threaded hole 101a, and the traction force of the electric hoist is transmitted to the wire lifting hook 100, ensuring that the power transmission line can be effectively lifted.

[0043] The arc portion 102a of the hook body 102 is semicircular, and the two ends of the arc portion 102a are respectively connected to the hook handle 101 and the straight portion 102b, and are both tangent to the arc portion 102a. It can be seen that the hook handle 101 and the straight portion 102b are arranged in parallel, so the shape of the wire lifting hook 100 is approximately U-shaped. When lifting the wire, the power transmission line will be placed in the recess formed by the U-shaped wire lifting hook 100. Since the depth of the recess is determined by the length of the straight portion 102b and the hook handle 101, and the length L1 of the hook handle 101 is greater than the length L2 of the straight portion 102b, the depth of the recess is mainly determined by the length L2 of the straight portion, and the diameter of the 35kV to 110kV power transmission line is less than L2=35mm, so when the power transmission line is placed on the arc portion 102a of the wire lifting hook 100, the power transmission line is not easy to slip out.

[0044] Specifically, in order to avoid the wire from breaking as much as possible during the wire lifting process and reduce the pressure of the wire lifting hook 100 on the wire, it is necessary to increase the contact area between the wire lifting hook and the wire as much as possible. By setting the expansion plate 103, the width W1 of which is much larger than the width W2 of the hook body, the contact area with the wire can be greatly increased, thereby reducing the risk of wire breaking.

[0045] Preferably, the expansion plate 103 can not only increase the contact area with the wire, but also slow down the shaking of the wire-lifting hook 100 during the wire-lifting process, thereby ensuring the smooth wire-lifting process. In addition, in order to further ensure the stability of wire-lifting by the wire-lifting hook 100, an anti-skid pad is added to the part of the expansion plate 103 that contacts the wire inside, thereby increasing the friction with the wire and preventing lateral displacement during the wire-lifting process.

[0046] Example 3

[0047] Reference Figure 3-5, which is the third embodiment of the present invention, and this embodiment provides a wire lifting device for 35kV to 110kV transmission lines. This embodiment is based on the previous embodiment, and is different from the previous embodiment in that: before lifting the transmission line, it is first necessary to calculate the vertical load G of the transmission line, and then determine the size of the electric hoist traction force F according to the vertical load G. When the traction force F is too small, the transmission line cannot be effectively lifted, and the insulators on the transmission line cannot be in a relaxed state, and the insulators cannot be replaced; when the traction force F is too large, the amplitude of lifting the transmission line is too large, even if the contact surface with the conductor is increased by the expansion plate 103, it is easy for the conductor to break.

[0048] Specifically, the vertical load G of the transmission line is mainly related to the size and model of the transmission line. Generally speaking, the model of the conductor on the 35kV line is JKLGYJ--120 / 25. The vertical load g1 of the conductor in the ice-covered state is 15.2682N / m 2 , conductor cross-sectional area S1 = 146.73 mm 2 , vertical distance ΔL V1 =500m; According to the calculation formula of vertical load:

[0049] G1=g1S1ΔL V1 =15.2682×10 -3 ×146.73×500=1340N

[0050] The model of the conductor on the 110kV line is LGJ-185 / 30. The vertical load g2 of the conductor under ice-covered condition is 16.5894N / m. 2 , conductor cross-sectional area S2 = 210.93 mm 2 , vertical distance ΔL V2 =500m; According to the calculation formula of vertical load:

[0051] G2=g2S2ΔL V2 =16.5894×10 -3 ×210.93×500=1749N

[0052] In summary, on a 35kV transmission line, the traction force F1 required for lifting the wire needs to be at least greater than the vertical load G1=1340N of the 35kV conductor, but at the same time it cannot exceed too much; on a 110kV transmission line, the traction force F2 required for lifting the wire needs to be at least greater than the vertical load G2=1749N of the 110kV conductor, but also cannot exceed this force too much.

[0053] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0054] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0055] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A wire lifting device for 35kV to 110kV transmission lines, characterized in that: include, A line lifting hook (100), comprising a hook handle (101) and a hook body (102); An expansion plate (103) is provided on the hook body (102).

2. The wire lifting device for 35kV to 110kV transmission lines according to claim 1, characterized in that: The hook body (102) comprises a circular arc portion (102a) and a straight line portion (102b), and the straight line portion (102b) is tangent to one end of the circular arc portion (102a).

3. The wire lifting device for 35kV to 110kV transmission lines according to claim 2, characterized in that: The arc portion (102a) is a semicircular structure, the hook handle (101) is tangent to the other end of the arc portion (102a), and the length L1 of the hook handle (101) is greater than the length L2 of the straight portion (102b).

4. The wire lifting device for 35kV to 110kV power transmission lines according to claim 3, characterized in that: The hook handle (101) is provided with a threaded hole (101a).

5. The wire lifting device for 35kV to 110kV power transmission line according to claim 4, characterized in that: The width W1 of the extension plate (103) is greater than the width W2 of the hook body (102), and the lengths of the two sides of the extension plate (103) extending beyond the hook body (102) are consistent.

6. The wire lifting device for 35kV to 110kV transmission lines according to claim 5, characterized in that: An anti-slip pad (103a) is provided on the inner side of the expansion plate (103).

7. The wire lifting device for 35kV to 110kV power transmission line according to claim 6, characterized in that: The length of the hook handle (101) is L1=100 mm, and the length of the straight portion (102b) is L1=35 mm.

8. The wire lifting device for 35kV to 110kV power transmission lines according to claim 7, characterized in that: The width of the expansion plate (103) is W1=65 mm, and the width of the hook body (102) is consistent with the width of the hook handle (101), W2=15 mm.

9. A thread lifting method, characterized in that: The invention comprises a wire lifting device for a 35kV to 110kV transmission line according to any one of claims 1 to 8, and Connecting the wire lifting hook (100) to the electric hoist of the external traction device; Determine the vertical load G of the transmission line and the traction force F of the electric hoist according to the model of the transmission line; The transmission line is lifted by the electric hoist to replace the insulator.

10. The wire lifting device for 35kV to 110kV power transmission lines according to claim 9, characterized in that: Determine the vertical load g of the conductor by the model of the transmission line; Measure the cross-sectional area S of the conductor; Determine the vertical spacing ΔL of the conductor V ; The vertical load of the conductor G = gSΔL V ; The vertical load g of the conductor is the maximum vertical load measured when the conductor is covered with ice; When the traction force of the electric hoist F>G, the insulators on the transmission line are in a relaxed state, and the replacement of the insulators is completed.

Images