A combined sleeve for double-cap bolts of power transmission tower and use method thereof

Abstract

The invention discloses a combined sleeve for double-cap bolts, which comprises a sleeve and a conversion chuck; the sleeve has an inner cavity for accommodating the conversion chuck; the outer surface of the conversion chuck matches the inner surface of the inner cavity of the sleeve, and the inner surface of the conversion chuck matches the outer surface of the nut to be constructed. The combined sleeve can be used for different double-cap bolt specifications of transmission towers, and the sleeve and the conversion chuck can be flexibly combined, and only a small number of components are needed to adapt to a wide range of bolt specifications; it can effectively solve the single nut construction problem of the double nut structure, and at the same time meet the reliable construction requirements of high-torque bolts; it has a simple structure, is easy to use, and is easy to carry.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission iron tower construction, and in particular to a combined sleeve for double-cap bolts of a power transmission iron tower and a use method thereof. Background Art

[0002] With the development of power grid, the voltage level of transmission lines is constantly increasing, and the types and number of transmission towers are increasing. At the same time, the society's demand for power supply reliability is increasing, and higher requirements are also put forward for the operation safety of transmission towers. Transmission towers are truss structures connected by bolts. Under the action of alternating loads such as dancing and strong gusts, the loosening and falling of bolts on the towers have become an important cause of transmission line failures.

[0003] In order to reduce the failure of transmission towers caused by loose bolts, double-cap bolts are often used for connection in tower construction. At present, when constructing new towers, the construction sequence is to tighten the lower nut first and then the upper nut. Since the nut is a hexagonal structure, when double-cap bolts are used, there is a misalignment of the corners of the upper and lower nuts, which makes it difficult to conduct random inspections of bolt tightening quality after construction is completed. In addition, when the transmission tower becomes loose after being subjected to alternating loads, there will also be a problem that the lower nut is difficult to re-tighten due to the misalignment of the upper and lower nuts. Figure 1 The schematic diagram shows the double nuts misaligned when connected with double cap bolts. In this case, it is difficult to re-tighten the lower nut with existing tools. In view of the above problems, a tool for double cap bolt construction of transmission towers is needed, which can realize the re-tightening construction, detection and testing of double cap bolts.

[0004] Chinese invention patent application CN110026930A discloses a socket wrench for the construction of double-cap bolts of power transmission towers, wherein a movable claw is arranged in the sleeve, and the movable claw can be moved until it matches the bolt according to the bolt specifications required for construction. Although the socket wrench can be used for a variety of bolt specifications, it has a complex structure and a long force transmission path, and has poor reliability when constructing high-torque bolts. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a combined sleeve structure for double-cap bolts of transmission towers and a method of using the same, which can be used for different double-cap bolt specifications of transmission towers. The sleeve and the conversion chuck can be flexibly combined, and only a small number of components are needed to adapt to a wide range of bolt specifications; the single nut construction problem of the double nut structure can be effectively solved, and the reliable construction requirements of high-torque bolts can be met; the structure is simple, easy to use, and easy to carry.

[0006] The present invention adopts the following technical solution:

[0007] A combined sleeve for double-cap bolts comprises a sleeve and a conversion chuck; the sleeve has an inner cavity for accommodating the conversion chuck; the outer surface of the conversion chuck matches the inner surface of the inner cavity of the sleeve, and the inner surface of the conversion chuck matches the outer surface of a nut to be constructed.

[0008] Preferably, the sleeve comprises a first body and a second body, wherein the diameter of the first body is smaller than the diameter of the second body; wherein the first body has a first inner cavity; the second body has a second inner cavity for accommodating and cooperating with the conversion chuck.

[0009] Preferably, the conversion chuck is a split structure, comprising a first part and a second part.

[0010] Preferably, the first part and the second part of the conversion chuck are connected by magnetic attraction, screw fastening or snap-on connection.

[0011] Preferably, one end of the first part and the second part of the conversion chuck are pivotally connected, and the other end is magnetically, screw-fastened or snap-connected together.

[0012] Preferably, the thickness of the sleeve is greater than the thickness of the double nuts of the double-cap bolt, and the thickness of the conversion chuck is less than the thickness of a single nut of the double-cap bolt.

[0013] Preferably, the cross-sectional shape of the inner cavity of the sleeve accommodating the conversion chuck is hexagonal, square, star-shaped or gear-shaped, and the cross-sectional shape of the outer surface of the conversion chuck matches the cross-sectional shape of the inner cavity, which is hexagonal, square, star-shaped or gear-shaped; the cross-sectional shape of the inner surface of the conversion chuck matches the nut to be constructed.

[0014] Preferably, the corners of the inner surface of the conversion chuck are all provided with circular root cleaning structures.

[0015] Preferably, there are more than two conversion chucks, the outer surface of the nut to be constructed matches the inner surface of the first conversion chuck, the outer surface of the first conversion chuck matches the inner surface of the second conversion chuck, until the outer surface of the last-level conversion chuck matches the inner surface of the inner cavity of the sleeve that accommodates the conversion chuck.

[0016] Preferably, the sleeve and the conversion chuck are both designed in series.

[0017] A method for using a combined sleeve for double-cap bolts using the aforementioned technical solution is characterized in that it comprises the following steps: Step 1, selecting a sleeve and a conversion chuck of appropriate size according to the type of the bolt to be constructed; Step 2, connecting the conversion chuck according to the position of the bolt to be constructed (such as the upper nut or the lower nut), and clamping the conversion chuck on the nut to be constructed of the bolt to be constructed; Step 3, putting the sleeve on the conversion chuck and tightening the bolt to be constructed.

[0018] Preferably, there are more than two conversion chucks. In step 2, the conversion chucks of each level are connected, the first conversion chuck is clamped on the nut to be constructed of the constructed bolt, and the second conversion chuck is clamped on the first conversion chuck, until the last conversion chuck; in step 3, the sleeve is put on the last conversion chuck.

[0019] The beneficial effects of the present invention are as follows:

[0020] The combined sleeve structure for double-cap bolts of a transmission tower of the present invention can be used for different double-cap bolt specifications of transmission towers. The sleeve and the conversion chuck can be flexibly combined, and only a small number of components are needed to adapt to a wide range of bolt specifications; it can effectively solve the single nut construction problem of the double nut structure, and at the same time can meet the reliable construction requirements of large torque bolts; it has a simple structure, is easy to use, and is easy to carry.

[0021] Specifically, the combined sleeve of the present invention adopts a sleeve-converting chuck mode, which has a simple and convenient structure and high reliability; the thickness of the conversion chuck is less than the thickness of a single nut, and the thickness of the inner cavity of the sleeve for accommodating the conversion chuck is greater than the thickness of the double nuts. In the construction of double-capped bolts, any one of the nuts can be tightened separately; the conversion chuck adopts a split structure, which solves the problem that the lower nut cannot be constructed when the corners of the upper and lower nuts of the double-capped bolts are misaligned; the conversion chuck is connected by magnetic suction or screw fastening methods, and the split chuck is combined into a whole, which is convenient for the matching connection between the split conversion chuck and the sleeve; the root cleaning structure design is adopted at the joint surface of the inner surface of the conversion chuck, which is convenient for the close matching of the conversion chuck and the nut; the sleeve and the conversion chuck are both serialized designs. In order to reduce the number of sleeves and improve the versatility and universality of the sleeve, each sleeve can be adapted to multiple conversion chucks, which can be applicable to nuts within a size range; the sleeve combination structure can use one sleeve and more than two conversion chucks in specific use, further improving the versatility of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the up-and-down misalignment of double nuts in a double-cap bolt structure;

[0023] Figure 2 It is a schematic diagram of the overall connection of a combined sleeve for double-cap bolts of a power transmission tower according to the present invention;

[0024] Figure 3 It is an exploded view of the components of the combined sleeve for the double-cap bolt of the power transmission tower after being assembled according to the present invention;

[0025] Figure 4 It is a schematic diagram of the combined sleeve for the double-cap bolt of the power transmission tower of the present invention when only the conversion chuck is installed;

[0026] Figure 5 is a schematic diagram of a sleeve of the combined sleeve of the present invention;

[0027] Figure 6 is a schematic diagram of the cross-sectional shape of the sleeve of the combined sleeve of the present invention;

[0028] Figure 7 It is a schematic diagram of a conversion chuck of a combined sleeve of the present invention;

[0029] Figure 8 It is a schematic diagram of the cross-sectional shape of the conversion chuck of the combined sleeve of the present invention;

[0030] Fig. 9 It is a schematic diagram of other embodiments of the combined sleeve of the present invention including more than two conversion chucks. DETAILED DESCRIPTION

[0031] The present application is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and cannot be used to limit the protection scope of the present application.

[0032] The specific implementation of the portable combined sleeve of the present invention, which can be used for bolts of various specifications and is suitable for the construction of power transmission iron double-cap bolts, is as follows:

[0033] Figure 2 This is a schematic diagram of the overall connection of the combined sleeve for the double-cap bolt of the transmission tower of the present invention. Figure 3 This is an exploded view of the components of the combined sleeve for the double-cap bolt of the power transmission tower after being assembled. Figure 4 It is a schematic diagram of the combined sleeve for the double-cap bolt of the power transmission tower of the present invention when only the conversion clamp is installed.

[0034] See also Figure 2-4 The combined sleeve for the double-cap bolts of the power transmission tower of the present invention comprises a sleeve 1 and a conversion chuck 2. The sleeve 1 is used to cooperate with a torque wrench to transfer the force of the constructor from the torque wrench to the conversion chuck 2, and the interior of the sleeve 1 is used to accommodate the conversion chuck 2. The conversion chuck 2 is used to be placed inside the sleeve 1, and its outer surface corresponds to the inner surface of the sleeve 1, and its inner surface corresponds to the outer surface of the bolt to be constructed. The conversion chuck 2 transfers the force applied by the sleeve 1 to the nut, thereby performing operations such as retightening construction, inspection and testing on the bolt.

[0035] Figure 5 The sleeve 1 of the combined sleeve of the present invention is shown. The sleeve 1 includes a first body 1-1 and a second body 1-2, wherein the diameter of the first body 1-1 is smaller than the diameter of the second body. The first body 1-1 has a first inner cavity 1-3, which is used to cooperate with a torque wrench; the second body 1-2 has a second inner cavity 1-4, which is used to cooperate with a conversion chuck. Preferably, the cross-sectional shape of the second inner cavity 1-4 can be hexagonal, square, star-shaped, gear-shaped, etc. Figure 6 The shapes of the second body 1 - 2 and the second inner cavity 1 - 4 of the sleeve 1 of the combined sleeve of the present invention are shown, (a) is a square, (b) is a hexagon, and (c) is a gear shape.

[0036] Figure 7 The conversion chuck 2 of the combined sleeve of the present invention is shown. In order to achieve the clamping of the lower nut or the upper nut separately without being clamped by another misplaced nut, the conversion chuck 2 adopts a split structure. Figure 7 As shown, the conversion chuck 2 includes a first part 2-1 and a second part 2-2. The first part 2-1 and the second part 2-2 are symmetrical structures. The first part 2-1 and the second part 2-2 both have end faces that contact each other. In order to facilitate on-site construction, it is preferred that the end faces of the first part 2-1 and the second part 2-2 are connected together by magnetic attraction, screw fastening or snap-on. In one embodiment of the present invention, the end face of the first part 2-1 has a dovetail groove / dovetail boss, and the end face of the second part 2-2 has a dovetail boss / dovetail groove correspondingly. In another embodiment of the present invention, one connection of the first part 2-1 and the second part 2-2 is pivotally connected, and the other connection is connected together by magnetic attraction, screw fastening or snap-on.

[0037] During on-site construction operations, Figure 4 As shown, firstly, the conversion chuck 2 is clamped to the nut to be constructed. Due to the clamping of the nut by the conversion chuck 2, the sleeve 1 can avoid the influence of the other misaligned nut in the double nut on the nut to be constructed, and can be smoothly sleeved on the conversion chuck 2, so that the torque wrench performs a tightening operation on the nut to be constructed through the sleeve and the conversion chuck 2. Preferably, the thickness of the conversion chuck 2 should be less than the thickness of a single nut, and the thickness of the second body 1-2 of the sleeve 1 should be greater than the thickness of the double nut, so that when the double-cap bolt is constructed, the tightening operation of any one of the nuts can be realized separately.

[0038] Continue to see Figure 7. The conversion chuck 2 has an outer surface 2-3 and an inner surface 2-4. During operation, the conversion chuck 2 is placed in the second inner cavity 1-4 of the second body 1-2 of the sleeve 1. The outer surface 2-3 of the conversion chuck 2 matches the inner surface of the second inner cavity 1-4 of the sleeve 1, and the cross-sectional shapes correspond. Preferably, the cross-sectional shape of the outer surface 2-3 of the conversion chuck 2 can be hexagonal, or square, star-shaped or gear-shaped. The inner surface 2-4 of the conversion chuck 2 matches the outer surface of the nut to be constructed, and the cross-sectional shapes correspond, usually hexagonal. Figure 8 The cross-sectional shapes of the inner and outer surfaces of the conversion chuck 2 of the present invention are shown.

[0039] Preferably, during machining, the six corners of the inner surface of the conversion chuck 2 usually have rounded corners at the junction of the two surfaces, which will interfere with the outer corners of the construction nut. In order to prevent possible interference, the conversion chuck 2 is subjected to root cleaning. The hexagonal corners of the inner surface of the conversion chuck 2 are all provided with circular root cleaning structures 2-5 to facilitate the close fit between the conversion chuck and the nut.

[0040] There are various types of double-cap bolts used in transmission towers. In order to minimize the number of sleeves used in the construction process and improve the versatility and universality of the sleeves, it is preferred to design the sleeve 1 in series according to the size of the bolts, and set the sleeve to be suitable for a certain number of bolt models in combination with the bolt models commonly used in transmission towers. For example, every 5 groups of adjacent bolt models can be adapted to the same sleeve, such as bolts M16 (bolts with a nominal diameter of 16 mm), M17, M18, M19, and M20 models are uniformly adapted to T-16 / 20 sleeves.

[0041] Correspondingly, the conversion chuck 2 is also designed in series, and the size of its outer surface is suitable for different types of sleeves, and the size of its inner surface is suitable for different types of bolts. For example, for bolts M16, M17, M18, M19, M20 and T-16 / 20 sleeves, conversion chucks with inner and outer surface sizes corresponding to the bolts and sleeves are respectively provided.

[0042] In one embodiment of the present invention, the combined sleeve only includes a sleeve and a conversion chuck, and the sizes of the conversion chuck correspond to those of the sleeve and the nut, respectively.

[0043] In this embodiment, the specific method of using the combined sleeve structure for double-cap bolts of a transmission tower of the present invention for the construction operation of double-cap bolts is as follows:

[0044] Step 1: Select the sleeve and conversion chuck of appropriate size according to the type of bolt to be constructed;

[0045] Step 2, according to the position of the bolt to be constructed (such as the upper nut or the lower nut), connect the two main bodies of the conversion chuck, and clamp the conversion chuck on the nut to be constructed of the bolt to be constructed;

[0046] Step 3: Put the sleeve on the conversion chuck and tighten the bolt to be constructed.

[0047] In other embodiments of the present invention, the combined sleeve may include a sleeve and more than two conversion chucks. Fig. 9 As shown, when in use, the inner surface of the sleeve 1 cooperates with the outer surface of the conversion chuck 2, the inner surface of the conversion chuck 2 cooperates with the outer surface of the conversion chuck 2', and so on, until the inner surface of the last conversion joint cooperates with the nut to be constructed. Preferably, the number of conversion chucks is 2-5. Since multiple conversion chucks can be used in combination according to specific needs, the versatility and universality of the conversion chucks can be further improved, the number of size specifications of the conversion chuck serial design can be reduced, and it is easy to use.

[0048] In this embodiment, the specific method of using the combined sleeve structure for double-cap bolts of a transmission tower of the present invention for the construction operation of double-cap bolts is as follows:

[0049] Step 1: Select a sleeve of appropriate size and two or more matching conversion chucks according to the type of bolt to be constructed;

[0050] Step 2, according to the position of the bolt to be constructed (such as the upper nut or the lower nut), sequentially connect the conversion chucks of various levels, and clamp the conversion chucks on the nut to be constructed of the bolt to be constructed; specifically, clamp the first conversion chuck on the nut to be constructed of the bolt to be constructed, and clamp the second conversion chuck on the first conversion chuck until the outer surface size of the conversion chuck matches the inner size of the sleeve;

[0051] Step 3, put the sleeve on the last-stage conversion chuck and tighten the bolts to be constructed.

[0052] The beneficial effect of the present application is that, compared with the prior art, the combined sleeve structure for double-cap bolts of transmission towers of the present invention can be used for different double-cap bolt specifications of transmission towers, the sleeve and the conversion chuck can be flexibly combined, and only a small number of components are needed to adapt to a wide range of bolt specifications; it can effectively solve the single nut construction problem of the double nut structure, and at the same time can meet the reliable construction requirements of high-torque bolts; it has a simple structure, is easy to use, and is easy to carry.

[0053] The applicant has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation schemes of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, but not to limit the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A combined sleeve for double cap bolts, characterized in that: The combined sleeve comprises a sleeve and a conversion chuck; The sleeve has an inner cavity for accommodating the conversion chuck; The outer surface of the conversion chuck matches the inner surface of the inner cavity of the sleeve, and the inner surface of the conversion chuck matches the outer surface of the nut to be constructed; The conversion chuck is a split structure, comprising a first part and a second part; The first part and the second part of the conversion chuck are connected by pivoting at one end and connected together by magnetic attraction, screw fastening or snap-fitting at the other end; The sleeve comprises a first body and a second body, wherein the diameter of the first body is smaller than the diameter of the second body; wherein the first body has a first inner cavity; and the second body has a second inner cavity for accommodating a conversion chuck and cooperating with the conversion chuck.

2. The combined sleeve for double cap bolts according to claim 1, characterized in that: The thickness of the sleeve is greater than the thickness of the double nuts of the double-cap bolt, and the thickness of the conversion chuck is less than the thickness of the single nut of the double-cap bolt.

3. The combined sleeve for double cap bolts according to claim 1, characterized in that: The cross-sectional shape of the inner cavity of the sleeve that accommodates the conversion chuck is hexagonal, square, star-shaped or gear-shaped, and the cross-sectional shape of the outer surface of the conversion chuck matches the cross-sectional shape of the inner cavity, which is hexagonal, square, star-shaped or gear-shaped; the cross-sectional shape of the inner surface of the conversion chuck matches the nut to be constructed.

4. The combined sleeve for double cap bolts according to claim 1, characterized in that: The corners of the inner surface of the conversion chuck are all provided with circular root cleaning structures.

5. The combined sleeve for double cap bolts according to claim 1, characterized in that: There are more than two conversion chucks, the outer surface of the nut to be constructed matches the inner surface of the first conversion chuck, the outer surface of the first conversion chuck matches the inner surface of the second conversion chuck, until the outer surface of the last-level conversion chuck matches the inner surface of the inner cavity of the sleeve that accommodates the conversion chuck.

6. The combined sleeve for double cap bolts according to claim 1, characterized in that: The sleeve and the conversion chuck are both designed in series.

7. The method for using the combined sleeve for double-cap bolts according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Select the sleeve and conversion chuck of appropriate size according to the type of bolt to be constructed; Step 2, according to the position of the bolt to be constructed, connect the conversion chuck, and clamp the conversion chuck on the nut to be constructed of the bolt to be constructed; Step 3: Put the sleeve on the conversion chuck and tighten the bolt to be constructed.

8. The method for using the combined sleeve for double-cap bolts according to claim 7, characterized in that: There are more than two conversion chucks. In step 2, the conversion chucks of each level are connected, the first conversion chuck is clamped on the nut to be constructed of the constructed bolt, and the second conversion chuck is clamped on the first conversion chuck until the last conversion chuck is reached; in step 3, the sleeve is put on the last conversion chuck.

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