A hardware and method for accurately adjusting the length of an insulator string

Abstract

The present invention relates to a hardware fitting suitable for accurately adjusting the length of an insulator string, comprising a connecting plate, a ring sleeve provided at the lower part of the connecting plate, a sliding adjustment rod coaxially inserted between the two ring sleeves, a scale provided on the connecting plate, and a marking line corresponding to the scale provided on the sliding adjustment rod. The present invention independently develops a hardware fitting suitable for accurately adjusting the length of an insulator string based on actual problems in actual 35kV and above overhead transmission line work, breaks through the fixed structure of the traditional DB plate or PT plate that cannot adjust the distance, and designs an adjustment hardware structure that can be accurately adjusted. The adjustment hardware is used to implement a method suitable for accurately adjusting the length of an insulator string, calculates the difference ΔX between the lengths of the insulator string of link 1 and the insulator string of link 2 through the line angle, and cooperates with the adjustment hardware of the present invention to perform accurate adjustment of any length, effectively and accurately solving the technical problem of inconsistent lengths of double-hanging-point double-insulator strings of angled tension towers.

Description

Technical Field

[0001] The present invention belongs to the field of electric power engineering and relates to an insulator string installation technology, in particular to a hardware and method suitable for accurately adjusting the length of an insulator string. Background Art

[0002] Currently, in the case of double hanging points on the crossarms of corner towers of 35kV and above overhead transmission lines, the towers can rotate at any angle between 0 and 90 degrees in actual applications, resulting in inconsistent lengths of the two insulator strings. This in turn causes uneven stress on the two insulator strings, and long-term stress exceeding the design load causes fatigue conditions, which not only affects the service life of the insulator strings, but also poses certain safety hazards.

[0003] In the prior art, adjusting hardware is used to adjust the length of insulator strings to meet the needs of power projects. Commonly used adjusting hardware is an adjustment plate (DB plate or PT plate), which consists of holes drilled at fixed intervals on a curved or rectangular steel plate, typically with fixed lengths of 25mm, 30mm, or 50mm. Each hole is located at a different distance from the top hanging point of the insulator string. The next hardware connected to the adjustment plate can change its hanging hole on the adjustment plate to achieve the purpose of changing the length of the entire insulator string. However, the holes in the existing DB adjustment plate are relatively large and fixed in spacing, making it impossible to accurately adjust the length of the insulator string, and their stability is also poor.

[0004] For two-piece insulator strings, the length difference between the two insulator strings varies within a certain range due to different tower rotation angles. In actual operation, it is difficult to accurately adjust the length difference between the two insulator strings, which means that the length of the hardware string cannot be accurately adjusted. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hardware and method suitable for accurately adjusting the length of an insulator string. The hardware can quickly and accurately calculate the length difference of two insulator strings, and use the hardware that can arbitrarily adjust the length to adjust the length of the two insulator strings. This can effectively avoid the occurrence of inconsistent lengths of the two tension strings and eliminate safety hazards.

[0006] The present invention solves the technical problem by adopting the following technical solutions:

[0007] The present invention provides a hardware fitting suitable for precise adjustment of the length of an insulator string, comprising a connecting plate, a first mounting hole being opened on the connecting plate, a ring sleeve being provided at the lower part of the connecting plate, a sliding adjustment rod being coaxially inserted between the two ring sleeves, a mounting piece being provided on one side of the sliding adjustment rod, a second mounting hole being provided on the mounting piece, a scale being provided on the connecting plate, and a marking line corresponding to the scale being provided on the sliding adjustment rod.

[0008] At the same time, the present invention also provides a method for accurately adjusting the length of an insulator string using the above-designed adjusting fitting, which specifically includes the following method steps:

[0009] (1) Connect the adjusting fitting to the movable end of the insulator string, install the movable end of the insulator string of link 1 in the first mounting hole of the corresponding adjusting fitting connecting plate, and temporarily fix the adjusting fitting through the second mounting hole. At this time, the length of the insulator string of link 1 is L1;

[0010] (2) Install the movable end of the insulator string of link 2 in the first mounting hole of another adjusting hardware connecting plate through the U-shaped hanging ring, and fix the adjusting hardware in the same manner as in step (1). At this time, the length of the insulator string of link 2 and the U-shaped hanging ring is L2;

[0011] (3) The difference in length between the insulator string of link 1 and the insulator string of link 2 is ΔX = L2 - L1 = d × tan(α / 2), where α is the line angle and d is the center distance between the insulator string of link 1 and the insulator string of link 2. After the value of ΔX is calculated, the sliding adjustment rod of the sliding adjustment hardware is used in conjunction with the scale on the connecting plate to achieve precise adjustment of L1 and L2.

[0012] The advantages and positive effects of the present invention are:

[0013] Based on practical problems encountered in the actual operation of 35kV and above overhead transmission lines, this invention independently developed a fitting suitable for precisely adjusting the length of insulator strings. This design breaks through the fixed structure of traditional DB or PT plates, which cannot adjust the distance, and designs a precisely adjustable fitting structure. This fitting also implements a method for precisely adjusting the length of insulator strings. The difference ΔX between the lengths of insulator strings in link 1 and link 2 is calculated based on the line angle. The fitting can then be used to precisely adjust the length to any desired value. This solves the problem of existing fittings that can only adjust fixed lengths, effectively resolving the technical issue of inconsistent lengths between two strings at two hanging points on angled tension towers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the adjusting hardware of the present invention;

[0015] Figure 2 This is a diagram showing the use of the adjusting hardware of the present invention;

[0016] Figure 3 This is a schematic diagram of an application of an embodiment of the method of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the scope of protection of the present invention cannot be limited thereto.

[0018] A hardware for precise adjustment of the length of an insulator string, such as Figure 1 As shown, it includes a connecting plate 1, a first mounting hole 3 is opened on the connecting plate, a ring sleeve 5 is provided at the lower part of the connecting plate, a sliding adjustment rod 6 is coaxially inserted between the two ring sleeves, a mounting member 8 is provided on one side of the sliding adjustment rod, a second mounting hole is provided on the mounting member, nuts 4 for fixing and locking the sliding adjustment rod are coaxially installed at both ends of the ring sleeve, a scale 2 is provided on the connecting plate, and a marking line 7 corresponding to the scale is provided on the sliding adjustment rod. The straight-line distance between the centers of the first mounting hole and the second mounting hole is recorded as L', the effective length of L' is 150-200mm, and the adjustable length is 0-50mm.

[0019] The connecting plate is a triangular steel plate, the ring sleeve is welded to the lower part of the triangular steel plate, and the mounting piece is also welded to one side of the sliding adjustment rod. There is no thread in the ring sleeve, and the sliding adjustment rod can be slidably adjusted in the two sleeves.

[0020] This adjusting hardware is connected to other hardware through the first mounting hole and the second mounting hole and is used in conjunction with the insulator string. The first mounting hole is a fixed mounting hole, and the second mounting hole is a movable mounting hole. When the second mounting hole moves left and right, the length of the effective distance L' between the two holes also changes accordingly (between 150-200mm), achieving the purpose of arbitrary length adjustment. When the length is adjusted, the sliding adjustment rod is fixed by the nut, and the position of the second mounting hole is fixed so that it no longer moves left and right.

[0021] A method for accurately adjusting the length of an insulator string using the above-mentioned adjusting fittings specifically includes the following steps:

[0022] (1) Connect the adjusting fitting to the movable end of the insulator string, such as Figure 2 As shown, the movable end of the insulator string of link 1 is installed in the first mounting hole of the corresponding adjustment fitting connecting plate, and the adjustment fitting is temporarily fixed through the second mounting hole. At this time, the length of the insulator string of link 1 is measured as L1;

[0023] (2) Install the movable end of the insulator string of link 2 into the first mounting hole of another adjusting hardware connecting plate through the U-shaped hanging ring 9, and fix the adjusting hardware in the same manner as in step (1). At this time, the length of the insulator string of link 2 and the U-shaped hanging ring is L2;

[0024] (3) Figure 3 , knowing that α is the line angle, the difference in length between the insulator strings of link 1 and link 2 is ΔX = L2 - L1 = d × tan(α / 2), where d is the center distance between the insulator strings of link 1 and link 2. After the value of ΔX is calculated, the adjusting hardware developed by the present invention can be used to accurately adjust L1 and L2, while the DB plate in the prior art cannot achieve precise adjustment.

[0025] Taking a line angle of 50° as an example, the center distance between the insulator string of link 1 and the insulator string of link 2 is 400mm, then ΔX=L2-L1=d×tan(α / 2)=400×tan25°=186.5mm. At this time, the value of L2-L1 needs to be adjusted to 186.5mm, that is, it can be precisely adjusted by sliding the sliding adjustment rod of this adjustment hardware.

[0026] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A method for accurately adjusting the length of an insulator string, characterized by: The method comprises the following steps: (1) Connect the adjusting fitting to the movable end of the insulator string, install the movable end of the insulator string of link 1 in the first mounting hole of the corresponding adjusting fitting connecting plate, and temporarily fix the adjusting fitting through the second mounting hole. At this time, the length of the insulator string of link 1 is L1; (2) Install the movable end of the insulator string of link 2 in the first mounting hole of another adjusting hardware connecting plate through the U-shaped hanging ring, and fix the adjusting hardware in the same manner as in step (1). At this time, the length of the insulator string of link 2 and the U-shaped hanging ring is L2; (3) The difference in length between the insulator string of link 1 and the insulator string of link 2 is ΔX = L2 - L1 = d × tan(α / 2), where α is the line angle and d is the center distance between the insulator string of link 1 and the insulator string of link 2. After the value of ΔX is calculated, the sliding adjustment rod of the sliding adjustment hardware is used in conjunction with the scale on the connecting plate to achieve precise adjustment of L1 and L2. The adjusting hardware includes a connecting plate, a first mounting hole is opened on the connecting plate, a ring sleeve is provided at the lower part of the connecting plate, a sliding adjustment rod is coaxially inserted between the two ring sleeves, a mounting piece is provided on one side of the sliding adjustment rod, a second mounting hole is provided on the mounting piece, a scale is provided on the connecting plate, and a marking line corresponding to the scale is provided on the sliding adjustment rod. The straight-line distance between the center of the first mounting hole and the second mounting hole is recorded as L', the effective length of L' is 150-200mm, and the adjustable length is 0-50mm.

2. The method for accurately adjusting the length of an insulator string according to claim 1, characterized in that: Nuts for fixing and locking the sliding adjustment rod are coaxially mounted on both ends of the ring sleeve.

3. The method for accurately adjusting the length of an insulator string according to claim 1, characterized in that: The connecting plate is a triangular steel plate, the ring sleeve is welded to the lower part of the triangular steel plate, and the mounting piece is welded to one side of the sliding adjustment rod.

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