Double-pulley hanger and double-pulley suspension system formed by the hanger

Abstract

The present invention discloses a double-pulley hanger and a double-pulley suspension system composed of the same, which solves the problem that there is no construction method that can be used to solve the problems of the passability of the board and the balanced force of each pulley in the double-pulley suspension method of the UHV line laying project. The present invention includes a supporting channel steel connecting the wheel cores of the two pulleys; it also includes a frame connected to the cross arm of the iron tower, the two pulleys are respectively hinged at the two ends of the bottom side of the frame, and the middle part of the top side of the frame is connected to the cross arm of the iron tower. The present invention adopts the principle of lever adaptation, which can effectively make the force of each pulley tend to be balanced, and improve the passability of the board and the hydraulic pipe protective cover during the deployment process.

Description

Technical Field

[0001] The invention belongs to the technical field of hangers, and in particular relates to a double-pulley hanger and a double-pulley suspension system constituted by the hanger. Background Art

[0002] In the construction of power lines, due to the various changes in the terrain of the transmission lines, the stress state of the wire-laying pulley and the passing state of the conductor vary greatly. The pulley suspension method is closely related to the laying quality of the wire and the safety control of the wire-laying process. Under normal circumstances, we use a single pulley suspension method. However, for towers with large spans, large height differences, and large turning angles, a single pulley suspension method cannot be used, and a double pulley is required for suspension. At present, the "Guidelines for Tension Wire Construction Technology" is basically used for suspension in engineering construction, but it is found that this suspension method has defects in actual engineering applications.

[0003] In actual engineering applications, the length of the hanger varies greatly due to the span of the project and the height difference of the tower. Although it can be calculated, the different length requirements of the hanger cannot be met on site, so the length of the hanger cannot be accurately controlled according to the calculation accuracy. This will cause the two pulleys to be unable to bear the force evenly, resulting in safety hazards during the wire deployment process. At the same time, the wire will be over-pressed on one of the pulleys, affecting the quality of the wire deployment, and failing to achieve the effect required by the suspension of double pulleys. The specific reasons are as follows:

[0004] When the engineering walkway passes through the pulley, since the pulley is connected to the tower crossarm with a steel wire rope, under the action of the pulley's own weight and the downward pressure exerted by the traction rope, the walkway needs to overcome great resistance when passing through the pulley. Figure 1 As shown in 1a, the moving trend of the pulley should be to move diagonally upward along the curve until it reaches the balance point. The travel board decreases after passing through the pulley, and the pulley moves in the opposite direction along the curve to the balance point. In this process, although the horizontal thrust T will be transmitted to the second pulley through the supporting channel steel between the first pulley and the second pulley, because the first pulley moves in front and the position of the moving curve is higher than the second pulley, when the travel board passes through the first pulley, the travel board tends to push the first pulley up, and the degree is greater than the second pulley, causing the first pulley to lift the travel board, and even the traction rope is separated from the wheel groove of the second pulley, as shown in Figure 1a. Figure 1 As shown in 1b, the first pulley is actually subjected to a single-wheel force during the process, and the double pulley group does not play a corresponding role. At the same time, the walking board often accumulates a certain amount of potential energy and passes through instantly, hitting the second pulley, causing the second pulley to be greatly impacted, which is easy to cause damage to the wheel piece and then damage the wire. In addition, after the walking board passes the balance point, due to the height difference between the first pulley and the second pulley and the tendency of the pulley to return along the curve after the horizontal thrust suddenly decreases, the walking board may directly cross the second pulley, or even jump.

[0005] The impact oscillation brought by the above mutation process to the entire pulley system and the wire-laying system is quite obvious, and there is no construction method that can be used to solve the problems of the board passability and the force balance of each pulley in the double pulley suspension method of the UHV line laying project. Summary of the invention

[0006] The technical problem to be solved by the present invention is that, in the double-pulley suspension method of the UHV line laying project, there is no construction method that can be used to solve the problems of the passability of the walking board and the balanced force of each pulley. The purpose is to provide a double-pulley hanger that solves the above problems. The hanger adopts the lever adaptive principle, which can effectively balance the force of each pulley, thereby improving the passability of the walking board and the hydraulic pipe protective cover during the deployment process.

[0007] The present invention is achieved through the following technical solutions:

[0008] A double pulley hanger includes a supporting channel steel connecting the wheel cores of two pulleys; it also includes a frame connected to the cross arm of an iron tower, the two pulleys are respectively hinged at the two ends of the bottom side of the frame, and the middle part of the top side of the frame is connected to the cross arm of the iron tower.

[0009] First, the pulleys are connected by supporting channel steel to control and maintain the distance between the pulleys to avoid collision of the pulleys.

[0010] Secondly, by adding the setting method of the frame, the adaptive principle of the lever can be effectively utilized, thereby effectively solving the problems of the board passability and the balanced force of each pulley. The specific solution principle and process are as follows:

[0011] Under normal circumstances, the two pulleys are in a balanced state, the two pulleys are evenly stressed, and the pulleys are vertically hung on the frame. During the wire laying process, when the walking board passes through the double pulley, the walking board drives the first pulley to tilt. Under the combined effect of the friction between the walking board and the pulley and the vertical load, the double pulley group will deflect. At this time, due to the hinged method, the first pulley and the second pulley generate an unbalanced torque relative to the hinge point of the frame, so they will rotate around the hinge point to balance the torque of the two pulleys, that is, the second pulley is driven to rotate on the frame through the supporting channel steel, causing the frame to always be parallel to the supporting channel steel. Therefore, the second pulley can be effectively lifted automatically through the action of the frame. Finally, according to the friction between the walking board and the pulley, the suspension system as a whole is effectively deflected, and automatically deflected to the direction of the combined force of the wire traction system acting on the pulley, realizing the lever self-adaptation method.

[0012] It can be seen from the above state changes that in the double-pulley suspension system using a hanger, during the process of laying out the wires and the process of the board passing through the double-pulley system, the system will automatically adjust the envelope angle of the pulley to balance the forces on the two pulleys, thereby meeting the purpose of using the double pulleys.

[0013] In order to achieve the best connection, the connection positions of the two pulleys and the frame are symmetrically arranged along the connection positions of the frame and the tower crossarm.

[0014] In order to improve stability and effectively increase service life, the frame includes a triangle with an isosceles triangle structure, a top hinged buckle fixed on the top angle of the triangle and connected to the crossarm of the iron tower, and two bottom hinged buckles fixed on the bottom edge of the triangle and used to hang two pulleys respectively.

[0015] In order to further increase the service life, a reinforcing rod is also arranged on the triangle.

[0016] Preferably, the two bottom hinge buckles are symmetrically arranged along the bisector of the vertex angle of the triangle.

[0017] Furthermore, the top hinge buckle and the bottom hinge buckle are both composed of a hinge plate located in the same plane as the triangle and fixed on the triangle; the hinge plate is also provided with a hinge hole and a hinge shaft passing through the hinge hole. The central axis of the hinge shaft is perpendicular to the plane where the triangle is located.

[0018] In order to improve stability and increase service life, the number of triangles in the frame is two, and they are arranged overlappingly. The top hinge buckle and the bottom hinge buckle are fixed between the two overlapping triangles with 8.8 grade high-strength bolts.

[0019] Furthermore, the angle of the vertex of the triangle is 90 to 160. Preferably, the frame is made of low alloy steel.

[0020] The present invention also provides a double pulley suspension system, including a suspension string butterfly-shaped sheet metal fitting hung on the cross arm of an iron tower, one or more adjustment plates connected to the suspension string butterfly-shaped sheet metal fittings, the above-mentioned hanger arranged on the adjustment plate, a pulley hung on the hanger, and a supporting channel steel arranged between two pulleys on the same hanger.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. The present invention has the function of adaptively adjusting the envelope angle, which makes the force of each pulley tend to be balanced during the deployment process, and improves the passability of the walking board and the hydraulic pipe protective cover during the deployment process;

[0023] 2. The present invention does not change the structure of the suspension pulley, and can still use a pulley with a large wheel diameter for deployment, thereby ensuring the contact surface between the wire and the pulley and ensuring the deployment quality of the wire;

[0024] 3. The present invention has the characteristics of simple structure and good stability. The weight of the whole truss is 53.5kg, which is light and convenient to install compared with the hardware and matching tools of the UHV project. It does not require the on-site operators to have special installation skills.

[0025] 4. The present invention does not require the use of new materials, and ordinary low-alloy steel (Q345) can be used, which is low in price. The series hanger set does not exceed 1,000 yuan / set, and the supporting channel steel does not exceed 120 yuan / piece, so the engineering cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the stress structure of the existing structure during the laying-out process.

[0028] Figure 2 It is a schematic structural diagram of the double pulley hanger in the present invention.

[0029] Figure 3 The structure of the double pulley suspension system of the present invention is shown in FIG. Figure 1 .

[0030] Figure 4 The structure of the double pulley suspension system of the present invention is shown in FIG. Figure 2 .

[0031] Figure 5 It is a schematic diagram of the state structure of the walking board when passing through the double pulleys in the present invention.

[0032] Marks and corresponding parts names in the attached drawings:

[0033] 1- pulley, 2- supporting channel steel, 3- frame, 4- tower cross arm, 5- hanging string butterfly plate fittings, 6- adjusting plate, 7- hanging angle steel;

[0034] 31-triangle, 32-top hinge buckle, 33-bottom hinge buckle, 34-hinge hole, 35-reinforcement rod. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0036] Example 1

[0037] A double pulley hanger, comprising a supporting channel steel 2 for connecting the wheel cores of two pulleys 1; characterized in that it also comprises a frame body 3 connected to a tower cross arm 4, wherein the two pulleys 1 are respectively hinged at both ends of the bottom side of the frame body 3, and the middle part of the top side of the frame body 3 is connected to the tower cross arm 4. The connection positions of the two pulleys 1 and the frame body 3 are symmetrically arranged along the connection positions of the frame body 3 and the tower cross arm 4, such as Figure 2-Figure 4 shown.

[0038] In this embodiment, the overall shape of the frame 3 can be a rectangle, a square or a triangle. This embodiment takes a triangle as an example. This embodiment adopts a triangular truss structure, which can give full play to the material properties, improve the connection stability and extend the service life, and can reduce the weight of the structure. The specific settings are as follows:

[0039] The frame 3 includes a triangular body 31 in an isosceles triangle structure, a top hinge buckle 32 fixed on the top corner of the triangular body 31 and connected to the tower cross arm 4, and two bottom hinge buckles 33 fixed on the bottom side of the triangular body 31 for hanging two pulleys 1 respectively. Figure 2 As shown, at the same time, a reinforcing rod 35 is also provided on the triangular body 31. Figure 3 and Figure 4 shown.

[0040] In this embodiment, the triangular body 31 is made of angle steel. In this embodiment, there are two triangular bodies 31 and they are overlapped. The top hinge buckle 32 and the bottom hinge buckle 33 are fixed between the two overlapping triangular bodies 31 with 8.8 grade high-strength bolts. Figure 2 shown.

[0041] At the same time, the top hinge buckle 32 and the bottom hinge buckle 33 are both composed of hinge plates located in the same plane as the triangle 31 and fixed on the triangle 31; the hinge plate is also provided with a hinge hole 34 and a hinge axis passing through the hinge hole 34.

[0042] The central axis of the hinge shaft is arranged perpendicular to the plane where the triangle 31 is located. Figure 2 shown.

[0043] This embodiment also provides a double pulley suspension system based on the double pulley hanger, such as Figure 3 and Figure 4 As shown, the specific configuration of the double-pulley suspension system is as follows:

[0044] In order to realize the hanging of multiple sets of double pulley hangers, the present invention connects the hanging angle steel 7 with the suspension string butterfly type plate metal fitting 5 with bolts, connects 4 points, and uses adjustment plates 6 at both ends to connect with the double pulley hanger at the lower end. Another adjustment plate 6 is used in the middle to connect with the lower end eyelet of the suspension string butterfly type plate metal fitting 5. When connecting, it should be noted that the eyelet at the lower end of the adjustment plate 6 should be adjusted to the same height, such as Figure 4 As shown, the eyelet at the lower end of the adjusting plate 6 is connected to the double pulley hanger with bolts to form the suspension system of the present invention.

[0045] The stress conditions of the suspension system of the present invention are as follows: Figure 5 As shown, the specific process is:

[0046] During the wire laying process, when the walking board passes through the double pulley, the entire double pulley suspension system will Figure 5 As shown in the figure, the two pulleys are in a balanced state. Figure 5 As shown in 5a in the figure, the two pulleys are under balanced forces. Figure 5 As shown in 5b in FIG, under the combined effect of the friction between the walking board and the pulley and the vertical load, the double pulley group will deflect; at this time, the first pulley and the second pulley generate an unbalanced torque relative to the hinge point of the hanger, so they will rotate around the hinge point to balance the torque of the two pulleys, as shown in FIG. Figure 5 After the rotation, the suspension system of the present invention will deflect as a whole, automatically deflecting to the direction of the combined force of the wire traction system acting on the pulley, as shown in FIG. Figure 5 As shown in Figure 5d.

[0047] Through the four states of the double-pulley suspension system, it can be seen that during the line-laying and unrolling process of the double-pulley suspension system using a hanger and the process of the board passing through the double-pulley system, the system will automatically adjust the envelope angle of the pulley to balance the forces on the two pulleys, thereby meeting the purpose of using the double pulley.

[0048] Example 2

[0049] The difference between this embodiment and embodiment 1 is that the specific structure of a double pulley hanger is optimized in this embodiment, and the specific configuration is as follows:

[0050] The angle of the top angle of the triangle 31 is 90 to 160. In this embodiment, the angle of the top angle of the triangle 31 is preferably set to 150 degrees. At the same time, the frame 3 is made of low alloy steel, and in this embodiment, it is preferably made of Q345 steel.

[0051] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double pulley hanger, comprising a supporting channel steel (2) for connecting the wheel cores of two pulleys (1); characterized in that: It also includes a frame (3) connected to the iron tower cross arm (4), the two pulleys (1) are respectively hinged at the two ends of the bottom side of the frame (3), and the middle part of the top side of the frame (3) is connected to the iron tower cross arm (4); The connection positions of the two pulleys (1) and the frame (3) are symmetrically arranged along the positions where the frame (3) and the tower crossarm (4) are connected; the frame (3) comprises a triangular body (31) in an isosceles triangle structure, a top hinge buckle (32) fixed on the top angle of the triangular body (31) and connected to the tower crossarm (4), and two bottom hinge buckles (33) fixed on the bottom edge of the triangular body (31) and used to hang the two pulleys (1) respectively; the triangular body (31) is also provided with a reinforcing rod (35); the top hinge buckle (32) and the bottom hinge buckle (33) are both composed of hinge plates located in the same plane as the triangular body (31) and fixed on the triangular body (31); the hinge plates are also provided with hinge holes (34) and hinge shafts passing through the hinge holes (34).

2. A double pulley hanger according to claim 1, characterized in that: The central axis of the hinge shaft is arranged perpendicular to the plane where the triangle (31) is located.

3. A double pulley hanger according to claim 1, characterized in that: The number of the triangular bodies (31) is two and they are arranged in an overlapping manner. The top hinge buckle (32) and the bottom hinge buckle (33) are both fixed between the two overlapping triangular bodies (31) by using 8.8 grade high-strength bolts.

4. A double pulley hanger according to claim 1, characterized in that: The vertex angle of the triangle (31) is 90 to 160 degrees.

5. A double pulley hanger according to claim 1, characterized in that: The frame (3) is made of low alloy steel.

6. A double pulley suspension system, characterized in that: It comprises a suspension string butterfly-shaped sheet metal fitting (5) hung on a tower cross arm (4), one or more adjustment plates (6) connected to the suspension string butterfly-shaped sheet metal fitting (5), a bracket as described in any one of claims 1 to 5 arranged on the adjustment plate (6), a pulley (1) hung on the bracket, and a supporting channel steel (2) arranged between two pulleys (1) on the same bracket.

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