Broadsword card for live replacement of strain double-string insulators of 220kV and below

Abstract

The utility model relates to the technical field of live-line replacement of strain double-string insulators, and provides a broadsword card for live-line replacement of strain double-string insulators of 220kV and below. A worm drives a worm gear, and the operating force required by an operator for replacing the insulators is reduced by utilizing the high transmission ratio of the worm gear and the worm; the driving block is designed to be in a hexagonal prism shape, a handle or an electric wrench can be used for operation, the labor intensity of operators is reduced, and the comfort and safety of operation are improved. The worm gear is designed to be in a circular arc shape in the tooth width direction, so that linear contact between the worm gear and the worm is achieved, and instability caused by point contact is avoided. Through bearing connection, shaking of the lead screw and the worm gear in the operation process is reduced, and the broadsword clamp is stably stressed in the use process; the operation part is arranged on the main body of the broadsword card, so that the problem that an insulator is easily short-circuited when the traditional broadsword card and the lead screw are connected and preposed is solved, and the operation efficiency and the operation safety are improved.

Description

Technical Field

[0001] This utility model relates to the field of live replacement technology for tension double-string insulators, and in particular to a large knife clamp for live replacement of tension double-string insulators of 220kV and below. Background Technology

[0002] Currently, the tools used for live-line replacement of double-string tension insulators of 220kV and below are large-blade clamps, single-pulling plates, and insulator support frames. These tools are categorized by voltage level, and the connection methods between the screw rod and the large-blade clamp are diverse, including front-mounted (which short-circuits the insulator if the connection is front-mounted) and rear-mounted. The large-blade clamps themselves are also categorized as bent-plate clamps, double-plate clamps, and square-plate clamps. The main problems with using these tools for insulator replacement are as follows: the large-blade clamps used for replacing double-string tension insulators employ a mechanical screw-tightening mechanism. To transfer the load on the insulator string, the operator must manually crank the screw rod, which is time-consuming and labor-intensive, causing numerous inconveniences to the operation.

[0003] Therefore, there is an urgent need for a large knife clamp for live replacement of 220kV and below tension double-string insulators to reduce the labor intensity of operators operating the screw rod during insulator replacement operations. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a large knife clamp for live replacement of 220kV and below tension double-string insulators, thereby reducing the labor intensity of operators of the screw rod during insulator replacement operations.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A large-blade clamp for live-line replacement of 220kV and below tension double-string insulators includes: a clamp body, a worm gear sleeved at the top of the clamp body, a lead screw sleeved inside the worm gear, and a worm shaft sleeved outside the worm gear, the two axes of the worm gear and the worm shaft intersecting at an angle of 90°, and the worm gear meshing with the worm shaft; a driving block is provided at one end of the worm shaft, the driving block extending out of the clamp body; and an internal thread matching the external thread of the lead screw is provided at the position where the worm gear and the lead screw are sleeved.

[0007] Preferably, the worm gear and the lead screw are integrally provided with connecting sleeves at both ends of the sleeve position, and the connecting sleeves are rotatably connected to the main body of the large tool holder through bearings.

[0008] Preferably, the outer periphery of the driving block is hexagonal prism.

[0009] Preferably, the bottom of the large knife card body is provided with a hook portion.

[0010] Preferably, one end of the lead screw is provided with a connecting hole, which is connected to the tension insulator string bearing tool.

[0011] Preferably, the worm gear and the main body of the large blade are rotatably connected by a bearing.

[0012] Preferably, the worm gear is arc-shaped along the tooth width direction, and the worm gear and the worm are in line contact.

[0013] This utility model discloses a large knife clamp for live replacement of 220kV and below tension double-string insulators, which has the following beneficial effects.

[0014] This utility model is achieved through...

[0015] This embodiment provides a large-blade clamp for live-line replacement of 220kV and below tension double-string insulators, which has the following beneficial effects:

[0016] The worm gear drives the worm wheel, utilizing the high transmission ratio between the worm and the worm to reduce the operating force required by operators when replacing insulators. The drive block is designed in a hexagonal prism shape, allowing operation with a handle or electric wrench, reducing the labor intensity of operators and improving comfort and safety. The worm wheel is designed with an arc shape along the tooth width to achieve line contact between the worm wheel and the worm, avoiding the instability caused by point contact. The bearing connection reduces vibration of the lead screw and worm wheel during operation, ensuring stable force distribution during use. The operating part is located on the main body of the large knife clamp, solving the problem of short-circuiting the insulator when the traditional large knife clamp is connected to the lead screw in the front, improving operating efficiency and safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of this utility model after the handle is removed.

[0019] Figure 3 This is a schematic diagram of the worm gear arrangement of this utility model.

[0020] Figure 4 This is a schematic diagram of the worm gear arrangement of this utility model.

[0021] Figure 5 This is a schematic diagram of the worm gear and worm wheel of this utility model.

[0022] In the attached diagram: 1-lead screw; 2-large blade holder body; 3-worm gear; 4-bearing; 5-worm wheel; 6-connecting hole; 7-drive block; 8-handle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0025] Reference Figures 1 to 5 A large-blade clamp for live-line replacement of 220kV and below tension double-string insulators includes: a clamp body 2, a worm gear 5 sleeved at the top of the clamp body 2, a lead screw 1 sleeved inside the worm gear 5, and a worm 3 sleeved outside the worm gear 5, as shown below. Figure 5 As shown, the worm gear 5 and worm 3 have a 90° intersection angle, and the worm gear 5 meshes with the worm 3. One end of the worm 3 is provided with a drive block 7, which extends out of the large tool holder body 2. The worm gear 5 has an internal thread matching the external thread of the lead screw 1 at its sleeve position. In this embodiment, the worm 3 is the main power transmission component. During operation, the teeth of the worm gear 5 slide and roll along the helical surface of the worm 3. Because the helical surface of the worm gear 5 meshes with the helical groove of the worm 3, an axial force is generated, causing the worm gear 5 to rotate relative to the lead screw 1. Since the worm gear 5 has an internal thread matching the external thread of the lead screw 1 at its sleeve position, and the lead screw 1 is fixed at both ends during use, the worm gear 5 is displaced along the lead screw 1, driving the large tool holder body 2 to move along the lead screw 1. Using the worm 3 to drive the worm gear 5 can produce a large transmission ratio, saving effort. In this embodiment, the rated load of the large tool holder body 2 is 40kN, it is made of high-strength alloy material, and its weight is controlled within 5kg. The adjustable stroke range of lead screw 1 is 0-25cm.

[0026] like Figure 4 As shown, in this embodiment, as a preferred embodiment, the worm gear 5 and the lead screw 1 are integrally provided with connecting sleeves at both ends of the sleeve position, and the connecting sleeves are rotatably connected to the main body 2 of the large knife clamp through the bearing 4.

[0027] like Figure 1 As shown, in this embodiment, one end of the lead screw 1 is provided with a connecting hole 6, which is connected to the tension insulator string bearing tool.

[0028] like Figure 1 and 2As shown, in this embodiment, the drive block 7 is hexagonal prism in shape. In order to facilitate the rotation of the worm gear 3 to shorten the distance between the tightening knife clamp body 2 and another clamp when replacing the tension double string insulator, the drive block 7 is rotated using the handle 8 or an electric wrench, which drives the worm gear 3 to rotate. This reduces the labor intensity of the operators and saves the operation time.

[0029] Preferably, in this embodiment, the bottom of the large knife card body 2 is provided with a hook portion.

[0030] like Figure 3 As shown, preferably, in this embodiment, the worm gear 3 and the large knife clamp body 2 are rotatably connected by a bearing 4.

[0031] To improve the contact between the worm gear 5 and the worm 3, such as Figure 5 As shown, preferably, in this embodiment, the worm wheel 5 is arc-shaped along the tooth width direction, so that it partially covers the worm 3. In this way, when the worm 3 and the worm wheel 5 mesh, it is a line contact rather than a point contact. By using a bearing 4 sleeve, vibration is avoided when the lead screw 1, worm 3 and worm wheel 5 rotate, so that the main body of the large tool clamp remains under stable force.

[0032] This embodiment solves several long-standing problems encountered in live-line replacement of 220kV and below tension double-string insulators. These problems include: short-circuiting the insulator when the large clamp and lead screw 1 are connected in the front position; relying on manual cranking of lead screw 1 to transfer the insulator load; and the time-consuming and laborious process of tightening lead screw 1 when the tension of the replaced insulator exceeds 20kN. This effectively improves the safety, reliability, and efficiency of live-line work, reduces the labor intensity of workers, and injects new vitality into the company's live-line work development.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Substitutions may include replacements for some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the scope of protection of this utility model.

Claims

1. A large knife clamp for live-line replacement of 220kV and below tension double-string insulators, characterized in that, include: The large knife card body (2) has a worm wheel (5) sleeved on the top end, a lead screw (1) sleeved inside the worm wheel (5), and a worm (3) sleeved on the outside of the worm wheel (5). The two axes of the worm wheel (5) and the worm (3) have an intersecting angle of 90°, and the worm wheel (5) meshes with the worm (3). One end of the worm (3) is provided with a drive block (7), and the drive block (7) passes through the large knife card body (2). The worm wheel (5) and the lead screw (1) sleeved position are provided with an internal thread that matches the external thread of the lead screw (1).

2. The large knife clamp for live-line replacement of 220kV and below tension double-string insulators according to claim 1, characterized in that, The worm gear (5) and the lead screw (1) are fitted with connecting sleeves at both ends, and the connecting sleeves are rotatably connected to the main body (2) of the large knife card through bearings (4).

3. The large knife clamp for live-line replacement of 220kV and below tension double-string insulators according to claim 1, characterized in that, The outer periphery of the drive block (7) is hexagonal prism.

4. A large knife clamp for live-line replacement of 220kV and below tension double-string insulators according to claim 1, characterized in that, The bottom of the large knife card body (2) is provided with a hook.

5. A large knife clamp for live-line replacement of 220kV and below tension double-string insulators according to claim 1, characterized in that, One end of the lead screw (1) is provided with a connecting hole (6), which is connected to the tension insulator string bearing tool.

6. A large knife clamp for live-line replacement of 220kV and below tension double-string insulators according to claim 1, characterized in that, The worm (3) is rotatably connected to the main body (2) of the large knife card through a bearing (4).

7. A large knife clamp for live-line replacement of 220kV and below tension double-string insulators according to claim 1, characterized in that, The worm wheel (5) is arc-shaped along the tooth width direction, and the worm wheel (5) and the worm (3) are in line contact.

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