Isolating switch safety locking structure

Abstract

The utility model provides an isolation switch safety locking structure, belonging to the locking structure technology field, the isolation switch safety locking structure comprises an L-shaped rotation hook, a fixed seat and a thread adjusting section, the L-shaped rotation hook is provided with a first straight section and a second straight section, the first straight section and the second straight section are mutually vertically connected to form an L-shaped structure; one end of the first straight section is hinged to the fixing seat through a pin shaft, the fixing seat is used for being installed on a fixing base body of the disconnecting switch, the thread adjusting section is arranged on the second straight section, continuous threads are arranged on the outer surface of the thread adjusting section, and the effective working length of the second straight section is changed by rotating the thread adjusting section. The first straight section and the fixing seat are provided with hinge holes, the hinge holes are connected with the pin shaft, the pin shaft is in clearance fit with the first straight section and the fixing seat, and the defects that a traditional disconnecting switch locking structure is inaccurate in locking and prone to being affected by the environment are overcome.

Description

Technical Field

[0001] This utility model belongs to the field of locking structure technology, specifically, it relates to a safety locking structure for a disconnecting switch. Background Technology

[0002] Disconnecting switches, as one of the important electrical devices in power systems, are mainly used for isolating power sources, switching operations, and ensuring a clearly visible break between electrical equipment and live parts during maintenance, thus protecting the safety of personnel and equipment. Their locking structure plays a crucial role, directly affecting the operational stability and safety of the disconnecting switch.

[0003] Traditional disconnector switch locking structures come in various forms, but most have some drawbacks. A common type is the ordinary padlock locking structure, which uses a mechanical lock attached to the disconnector switch's operating handle, with the lock cylinder and bolt working together to restrict the handle's rotation. However, this structure is too simple. Firstly, its locking position is limited, making it difficult to adapt to the precise opening and closing positions required by the disconnector switch under different operating conditions. For example, in some outdoor substations, due to large temperature variations, the disconnector switch's connecting rods and contacts may shift due to thermal expansion and contraction. The padlock lock cannot be flexibly adjusted, easily leading to locking failure, causing the disconnector switch to malfunction, and thus threatening the normal power supply of the power system. Another type of disconnector switch uses a pin-type locking structure, which relies on a pin inserted into a corresponding pin hole to restrict the movement of critical components. However, after long-term use, the pin and pin hole in this structure are prone to loosening due to wear and corrosion. Especially in harsh environments such as humid and dusty conditions, dust and moisture enter the gap between the pin and pin hole, accelerating component corrosion and reducing the reliability of the lock. Moreover, once the latch becomes deformed or stuck, unlocking and locking operations become extremely difficult, seriously affecting maintenance efficiency, increasing power outage maintenance time, and causing losses to the power supply. Utility Model Content

[0004] In view of this, the present invention provides a safety locking structure for disconnecting switches, which solves the drawbacks of traditional disconnecting switch locking structures, such as inaccurate locking and susceptibility to environmental influences, and provides a precise and reliable safety locking solution for disconnecting switches.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a safety locking structure for a disconnecting switch, comprising: an L-shaped rotary hook, a fixed base, and a threaded adjustment section. The L-shaped rotary hook has a first straight section and a second straight section, which are perpendicularly connected to each other to form an L-shaped structure. One end of the first straight section is hinged to the fixed base via a pin. The fixed base is used to install the disconnecting switch on its fixed base. The threaded adjustment section is disposed on the second straight section, and its outer surface has continuous threads. The effective working length of the second straight section can be changed by rotating the threaded adjustment section.

[0007] One end of the first straight section of the L-shaped rotary hook is hinged to the fixed base via a pin. This end connection allows the L-shaped rotary hook to rotate flexibly on the fixed base around the pin, enabling efficient locking and unlocking of the disconnector linkage. The threaded adjustment section is located in the main body of the second straight section of the L-shaped rotary hook, starting from the root near the connection with the first straight section and extending a certain length along the axial direction of the second straight section.

[0008] Based on the above technical solution, the safety locking structure of the disconnecting switch of this utility model can be further improved as follows:

[0009] Both the first straight section and the fixed base are provided with hinge holes, which are connected to the pin. The pin is clearance-fitted to the first straight section and the fixed base.

[0010] This range ensures both the necessary flexibility for the L-shaped slewing hook to rotate around the pin, preventing it from jamming due to excessive friction when manually operated or driven by an external drive device, thus ensuring smooth operation; and effectively limiting the radial displacement of the slewing hook to prevent excessive radial swaying during rotation due to interference factors such as vibrations from the disconnecting switch or accidental collisions from external forces. This would avoid unnecessary scraping or collisions with other peripheral components of the disconnecting switch, affecting the normal operation and service life of the entire disconnecting switch system.

[0011] Furthermore, the end of the second straight section is provided with a hook head, the inner side of which is an arc-shaped concave surface, and the arc-shaped concave surface is adapted to the outer diameter of the disconnecting switch connecting rod.

[0012] Furthermore, the thread of the threaded adjustment section is a trapezoidal thread, and the tooth profile of the trapezoidal thread is an isosceles trapezoid.

[0013] Furthermore, the clearance fit specifically means that the outer diameter of the pin is smaller than the inner diameter of the hinge hole on the first straight section and the inner diameter of the hinge hole corresponding to the fixed seat, forming a gap, the gap being 0.1mm-0.3mm.

[0014] Furthermore, a rubber anti-slip pad is affixed to the contact area between the hook and the disconnecting switch linkage.

[0015] Furthermore, the first straight segment and the second straight segment are integrally formed, and the ratio between the length of the first straight segment and the length of the second straight segment is 1:0.5-1:1.5.

[0016] A hinge hole is provided at the end of the first straight section of the L-shaped swivel hook. This hole is located at the center of the end to allow it to concentrically mate with a corresponding hinge hole on the fixed base, enabling smooth rotational movement via a pin. For the second straight section, a hinge hole is typically provided near the root where it connects to the first straight section.

[0017] Furthermore, the hook head and the second straight section are integrally formed.

[0018] The hook of the second straight section faces outward. When the L-shaped rotary hook is used to lock the disconnecting switch, the fixing base is installed on the fixing base of the disconnecting switch, the end of the first straight section is hinged to the fixing base, and the second straight section extends outward with its hook facing away from the fixing base so as to be able to hook the connecting rod of the disconnecting switch smoothly.

[0019] Furthermore, the mounting base is made of metal.

[0020] Furthermore, the bottom plane of the fixing base is attached to the upper surface of the fixing base of the disconnecting switch, and the two are connected by welding or bolts.

[0021] For example, Chinese utility model patent publication number CN118888372B (application number CN202411388097.8) discloses a power disconnect switch, including a base, multiple insulator supports fixed to the top of two horizontal plates, a contact fixed to the top of each insulator support, a conductive plate rotatably connected to one of the contacts, a common rotating shaft rotatably connected between the two vertical plates, a handle fixed to the end of the rotating shaft, multiple lifting rods fixedly sleeved on the rotating shaft, the other end of each lifting rod rotatably connected to a corresponding conductive plate, a fixing plate and a guide plate fixed to the top of the conductive plate, a shaft column rotatably connected inside the opening, an elastic strip fixed to the end of a rocker arm, and a toggle assembly connected to the rocker arm. In this invention, by periodically toggling the end of the rocker arm through the toggle assembly, the rocker arm rotates around the shaft column, and its end pulls the elastic strip to one side. Then, under the elastic force of the elastic strip, the elastic strip swings in the opposite direction, thereby driving away birds through the continuous swinging of the elastic strip, achieving a bird-repelling effect.

[0022] The rotary hook lock structure of this utility model can be applied to the rotating shaft operating part of the power disconnect switch. The working principle is as follows: The fixed base is installed on the longitudinal plate of the disconnect switch base or other stable support structure, and a tight connection is ensured by welding or bolts. The first straight section of the L-shaped rotary hook is hinged to the fixed base via a pin, and the hook head of the second straight section faces the conductive plate. When it is necessary to lock the disconnect switch, the operator rotates the L-shaped rotary hook. Based on the lever principle, with the pin as the fulcrum and the first straight section as the lever arm, the hook head approaches and hooks the lifting rod or other key transmission components that represent the open / closed state of the disconnect switch, which are linked to the rotating shaft. The tight contact between the inner arc-shaped concave surface of the hook head and the component generates sufficient friction to restrict its movement. Simultaneously, the threaded adjustment section can finely adjust the length of the second straight section as needed to adapt to changes in component position caused by equipment operation and environmental changes, ensuring that the disconnect switch is stably in the open or closed state, preventing misoperation, ensuring the safe operation of the power system, and complementing the functions of the original patent to jointly improve the overall performance of the power disconnect switch. Compared with the prior art, the beneficial effects of the safety locking structure for disconnecting switches provided by this utility model are:

[0023] Thanks to the unique design of the L-shaped rotary hook, the inner arc-shaped concave surface of its hook head can tightly fit the outer diameter of the disconnector switch connecting rod. Regardless of changes in the position or size of the connecting rod due to environmental factors (such as thermal expansion and contraction) or changes in equipment operating conditions (such as minor deformation caused by long-term frequent operation), rotating the L-shaped rotary hook can precisely find the optimal locking position, ensuring that the disconnector switch is always in the predetermined opening and closing state. For example, in high-temperature environments, the disconnector switch connecting rod expands, increasing its diameter by 2-3mm. The threaded adjustment section can quickly adjust the length of the second straight section, ensuring that the hook head still firmly locks the connecting rod, preventing malfunctions caused by loose locking and ensuring a continuous and stable power supply to the power system.

[0024] The mounting base and the disconnector's fixing body are connected by welding or bolts, ensuring a firm and reliable connection. The deep weld penetration guarantees the stability of the mounting base, and the evenly distributed bolts bear the tensile force, effectively preventing overall displacement of the hook-lock structure due to vibration, external impact, or other factors. For example, in substations in earthquake-prone areas, even under strong vibrations, the rotary hook-lock structure remains firmly fixed to the disconnector, maintaining the locking of the linkage, preventing malfunctions of the disconnector, and ensuring the safety of the power system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] Figure 1 This is an example diagram of a safety locking structure for a disconnector switch;

[0028] Figure 2 A perspective view of a cross-section of a safety locking structure for a disconnector switch;

[0029] 10. L-shaped slewing hook; 11. First straight section; 12. Second straight section; 121. Hook head; 20. Fixed base; 30. Threaded adjustment section. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] like Figure 1 The diagram shows a first embodiment of a safety locking structure for a disconnecting switch provided by this utility model. In this embodiment, it includes an L-shaped rotary hook 10, a fixed base 20, and a threaded adjustment section 30. The L-shaped rotary hook 10 has a first straight section 11 and a second straight section 12, which are perpendicularly connected to each other to form an L-shaped structure. One end of the first straight section 11 is hinged to the fixed base 20 by a pin. The fixed base 20 is used to install on the fixed base of the disconnecting switch. The threaded adjustment section 30 is disposed on the second straight section 12. The outer surface of the threaded adjustment section 30 is provided with continuous threads. The effective working length of the second straight section 12 can be changed by rotating the threaded adjustment section 30.

[0032] In the above technical solution, both the first straight section 11 and the fixed base 20 are provided with hinge holes, which are connected to the pin shaft. The pin shaft and the first straight section 11 and the fixed base 20 are in clearance fit.

[0033] Furthermore, in the above technical solution, the end of the second straight section 12 is provided with a hook head 121, the inner side of the hook head 121 is an arc-shaped concave surface, and the arc-shaped concave surface is adapted to the outer diameter of the disconnecting switch connecting rod.

[0034] like Figure 2 As shown, further, in the above technical solution, the thread of the thread adjustment section 30 is a trapezoidal thread, and the tooth profile of the trapezoidal thread is an isosceles trapezoid.

[0035] Furthermore, in the above technical solution, the clearance fit specifically means that the outer diameter of the pin is smaller than the inner diameter of the hinge hole on the first straight section 11 and the inner diameter of the hinge hole corresponding to the fixed seat 20, forming a gap of 0.1mm-0.3mm.

[0036] Furthermore, in the above technical solution, a rubber anti-slip pad is attached to the contact part between the hook 121 and the disconnecting switch connecting rod.

[0037] Furthermore, in the above technical solution, the first straight segment 11 and the second straight segment 12 are integrally formed, and the ratio between the length of the first straight segment 11 and the length of the second straight segment 12 is 1:0.5-1:1.5.

[0038] Furthermore, in the above technical solution, the hook head 121 and the second straight section 12 are integrally formed.

[0039] Furthermore, in the above technical solution, the fixing base 20 is made of metal.

[0040] Furthermore, in the above technical solution, the bottom plane of the fixing seat 20 is attached to the upper surface of the fixing base of the disconnecting switch, and the two are connected by welding or bolts.

[0041] Specifically, the principle of this utility model is as follows:

[0042] The L-shaped rotary hook is hinged to the fixed base via a pin, forming a rotary mechanism with the pin as its axis. When the operator applies external force, according to the lever principle, with the pin as the fulcrum and the first straight section of the L-shaped rotary hook as the lever arm, the external force acts on the first straight section, generating a torque that causes the L-shaped rotary hook to rotate around the pin. This rotary motion allows the hook head to quickly approach or move away from the isolating switch linkage, achieving efficient locking and unlocking operations.

[0043] Clearance fit plays a crucial role in rotary motion. The minute clearance between the pin, the first straight section of the L-shaped rotary hook, and the fixed base ensures smooth rotation. When the L-shaped rotary hook rotates, the clearance provides sufficient space for its radial displacement, preventing friction caused by interference fit from hindering rotation. Simultaneously, this clearance limits the radial wobble amplitude. Based on the principles of mechanical kinematics, by appropriately setting the clearance value, the motion trajectory of the L-shaped rotary hook during rotation is constrained within a stable range, preventing collisions and interference with other components of the disconnecting switch and ensuring operational accuracy.

[0044] The adjusting section uses a trapezoidal thread, achieving length adjustment based on the principle of helical transmission. When the adjusting nut on the adjusting section is rotated, the rotational motion of the nut is converted into linear motion of the adjusting section according to the helix angle and tooth profile of the thread. Because the trapezoidal thread has excellent self-locking properties, its tooth profile angle and thread parameter design ensure that the friction between the threads prevents the thread from reversing on its own when subjected to axial force, thus guaranteeing a stable adjusted length.

[0045] When the L-shaped slewing hook rotates to the locked position, the inner arc-shaped concave surface of the hook head contacts the disconnector switch connecting rod. At this time, according to the principle of friction, the tight contact between the arc-shaped concave surface and the connecting rod generates a large static friction force. This friction force is in the opposite direction to the possible displacement direction of the connecting rod, effectively preventing the connecting rod from moving unexpectedly during the operation of the disconnector switch. At the same time, the hook head applies a certain radial pressure to the connecting rod, further enhancing the locking effect and mechanically ensuring that the disconnector switch is in a stable opening and closing state.

Claims

1. A safety locking structure for a disconnecting switch, characterized in that, include: The L-shaped rotary hook (10), the fixed seat (20), and the threaded adjustment section (30) are provided. The L-shaped rotary hook (10) has a first straight section (11) and a second straight section (12). The first straight section (11) and the second straight section (12) are perpendicularly connected to each other to form an L-shaped structure. One end of the first straight section (11) is hinged to the fixed seat (20) by a pin. The fixed seat (20) is used to install on the fixed base of the disconnecting switch. The threaded adjustment section (30) is provided on the second straight section (12). The outer surface of the threaded adjustment section (30) is provided with a continuous thread. The effective working length of the second straight section (12) can be changed by rotating the threaded adjustment section (30). The end of the second straight section (12) is provided with a hook head (121). The inner side of the hook head (121) is an arc-shaped concave surface. The arc-shaped concave surface is adapted to the outer diameter of the disconnecting switch connecting rod. A rubber anti-slip pad is attached to the contact part between the hook head (121) and the disconnecting switch connecting rod.

2. The safety locking structure for a disconnecting switch according to claim 1, characterized in that, Both the first straight section (11) and the fixed seat (20) are provided with hinge holes, which are connected to the pin. The pin is clearance-fitted with the first straight section (11) and the fixed seat (20).

3. The safety locking structure for a disconnecting switch according to claim 2, characterized in that, The thread of the threaded adjustment section (30) is a trapezoidal thread, and the tooth profile of the trapezoidal thread is an isosceles trapezoid.

4. The safety locking structure for a disconnecting switch according to claim 3, characterized in that, The clearance fit specifically means that the outer diameter of the pin is smaller than the inner diameter of the hinge hole on the first straight section (11) and the inner diameter of the hinge hole corresponding to the fixed seat (20), forming a gap, the gap being 0.1mm-0.3mm.

5. The safety locking structure for a disconnecting switch according to claim 4, characterized in that, The first straight segment (11) and the second straight segment (12) are integrally formed, and the ratio between the length of the first straight segment (11) and the length of the second straight segment (12) is 1:0.5-1:1.

5.

6. The safety locking structure for a disconnecting switch according to claim 5, characterized in that, The hook head (121) and the second straight section (12) are integrally formed.

7. The safety locking structure for a disconnecting switch according to claim 6, characterized in that, The mounting base (20) is made of metal.

8. The safety locking structure for a disconnecting switch according to claim 7, characterized in that, The bottom plane of the fixing base (20) is attached to the upper surface of the fixing base of the disconnecting switch, and the two are connected by welding or bolts.

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