Built-in PT cabinet primary protective tube replacement device and method

Abstract

The invention belongs to the field of power equipment, and particularly relates to a built-in PT cabinet primary protective tube replacing device and method.The device comprises a driving structure, a mechanical arm and a control terminal, the driving structure is connected with the control terminal, the control terminal is used for controlling the driving structure to act, and the mechanical arm is connected with the driving structure. And the driving structure drives the manipulator to act. The mechanical touch hand completely replaces a human hand to directly extend into the electrified PT cabinet for operation, so that the electric shock risk caused by inconvenient operation or accidental contact when an operator works in a narrow and electrified space and the risk that the operator is cut by a sharp edge of a damaged protective tube are fundamentally avoided, and the operation safety is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a device and method for replacing a primary fuse of a built-in PT cabinet. Background Art

[0002] Operating substations face the risk of lightning strikes due to their unique environments. PT cabinets, or voltage transformer cabinets, are critical devices used to measure voltage in substations. Since the primary side of a PT cabinet is directly connected to high-voltage lines, overvoltage generated by lightning strikes can be transmitted through the lines to the windings, causing insulation breakdown, internal short circuits, or even explosions. As crucial protective devices in power facilities, the fuses within the PT cabinets are responsible for guiding lightning currents and safely dissipating energy.

[0003] During maintenance, replacing the primary fuse in a built-in PT cabinet is difficult. The fuse is located inside the switch trolley's contact arm, which is secured by a threaded bottom. Due to the limited space in the contact arm, maintenance personnel cannot reach the fuse with their fingers, making it difficult to manually unscrew and replace it. This creates significant challenges for maintenance personnel. Furthermore, under the existing operating process, a blown primary fuse requires the station's PT system to be shut down, impacting the stable operation of the power system. Failure to replace the fuse in a timely manner can easily cause system fluctuations, leading to voltage loss within the station and impacting power supply reliability.

[0004] Publication number CN110660625A discloses a 35kV high-altitude high-voltage fuse sleeve-type fuse replacement device, comprising a sleeve base, a movable cover, a locking portion, an unlocking portion, a base bracket, an insulating rod, and a fuse clamping unit. The 35kV high-altitude high-voltage fuse sleeve-type fuse replacement device of the present invention utilizes the interaction between the movable cover, the movable cover operating hole, and the unlocking operating unit to enable an operator to open and close the movable cover on the outside of the 35kV high-altitude high-voltage fuse on the ground using common tools, such as a pull rod. Furthermore, the provision of the fuse clamping unit and the insulating rod increases the operating height, and the provision of a lever arm with adjustable tension and angle of the fuse clamping unit allows operators to replace fuses on the ground. However, the device is designed for upward clamping of fuses at heights and is not suitable for clamping fuses in PT cabinets. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for replacing a primary fuse of a built-in PT cabinet, so as to solve the problem of inconvenience in replacing fuses of existing built-in PT cabinets in the background art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The device for replacing a primary fuse of a built-in PT cabinet comprises a drive structure, a manipulator and a control terminal. The drive structure is connected to the control terminal, the control terminal is used to control the movement of the drive structure, and the manipulator is connected to the drive structure, the drive structure drives the manipulator to move.

[0007] Preferably, the control terminal is provided with a clamping button for controlling the clamping action of the manipulator, a clockwise button for controlling the clockwise rotation of the manipulator, a counterclockwise button for controlling the counterclockwise rotation of the manipulator, and a pressure display.

[0008] Preferably, the driving structure includes a driving motor, an output end of the driving motor is connected to a transmission shaft, and one end of the transmission shaft is fixedly connected to the output end of the driving motor.

[0009] Preferably, a support rod is fixedly provided on the control terminal, and the support rod is fixedly connected to the drive motor.

[0010] Preferably, the manipulator includes a shell, a fixed plate, a first rotating arm, a second rotating arm, a pulling rod, a rotating shaft, and a pressure sensor. The fixed plate, the first rotating arm, the second rotating arm, the pulling rod, the rotating shaft, and the pressure sensor are arranged in the shell. There are two first rotating arms, which are symmetrically distributed. The first end of the first rotating arm is rotatably connected to the fixed plate. The first end of the first rotating arm is a circular plate with meshing teeth provided at the edge. The meshing teeth on the two first rotating arms are meshed and connected. The second end of the first rotating arm and the first end of the second rotating arm are rotatably connected. A pulling rod is provided between the second rotating arm and the fixed plate. The first end of the pulling rod is rotatably connected to the middle part of the second rotating arm. The second end of the pulling rod is rotatably connected to the fixed plate. A clamping motor is provided in the shell, and the clamping motor is used to drive the first rotating arm.

[0011] Preferably, the shell is divided into two sections, the first section is made of hard material and fixedly connected to the second end of the transmission shaft, and the second section of the shell is made of elastic material.

[0012] Preferably, the first rotating arm is connected to the fixed plate via a rotating shaft, wherein a driven wheel is provided on the rotating shaft of one of the first rotating arms, a driving wheel is provided on the output shaft of the clamping motor, and the driving wheel and the driven wheel are connected via a belt.

[0013] Preferably, a clip strip is provided on the second end of the second rotating arm.

[0014] Preferably, the clamping strips are arc-shaped strips, and the arc-shaped concave surfaces of the two clamping strips are opposite to each other.

[0015] A second aspect of the present invention provides a method for replacing a primary fuse in a built-in PT cabinet, using the aforementioned device for replacing a primary fuse in a built-in PT cabinet, comprising the following specific steps: Step 1: Insert the robot into the built-in PT cabinet and pick up the damaged fuse; Step 2: The control terminal drives the driving structure, which drives the manipulator to rotate clockwise to unscrew the damaged fuse; Step 3: Hold the replaced fuse on the manipulator and insert it into the built-in PT cabinet; Step 4: The control terminal drives the driving structure, which drives the manipulator to rotate clockwise to install the replaced fuse; Step 5. Release the manipulator and remove the device from the built-in PT cabinet to complete the installation.

[0016] The beneficial effects of the present invention are as follows: The present invention is designed for built-in PT cabinet models from different manufacturers. Mechanical tentacles completely replace manual labor, allowing operators to directly reach into the energized PT cabinet for operation. This fundamentally avoids the risk of electric shock caused by awkward operation or accidental contact when operating personnel in narrow, energized spaces, as well as the risk of being cut by the sharp edges of damaged fuses, significantly improving operational safety. The direct-drive design features a compact, highly efficient drive shaft, making it easy to expand application scenarios or adapt to fuses of different sizes and working environments. This increases the versatility of the tool. Its compact size, strong operability, ease of use, and portability ensure the safety of on-site maintenance personnel, significantly improve the efficiency of PT fuse replacement, and facilitate use by operators. The integrated pressure sensor monitors and displays the clamping force in real time. Combined with the preset pressure threshold and alarm function, it ensures that the fuse is securely clamped and not damaged by excessive force, significantly improving the reliability and success rate of the assembly and disassembly process. An operating procedure for replacing special tools for PT primary insurance has been established, which has supplemented the operating methods for replacing PT primary insurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic structural diagram of a primary fuse replacement device for a built-in PT cabinet according to embodiment 1 of the present invention; Figure 2 This is a structural diagram of a control terminal for a primary fuse replacement device in a built-in PT cabinet according to embodiment 1 of the present invention; Figure 3 This is a schematic structural diagram of the housing of the primary fuse replacement device for a built-in PT cabinet according to embodiment 1 of the present invention; Figure 4This is a schematic diagram of the internal structure of the manipulator of the built-in PT cabinet primary fuse replacement device according to Example 1 of the present invention; Figure 5 This is a structural diagram of the back side of the fixing plate of the primary fuse replacement device for the built-in PT cabinet according to embodiment 1 of the present invention; Figure 6 This is a structural diagram of the clamping strip of the primary fuse replacement device for a built-in PT cabinet according to embodiment 1 of the present invention.

[0018] Among them: 1. Control terminal; 2. Operating handle; 3. Drive motor; 4. Support rod; 5. Transmission shaft; 6. Manipulator; 61. Fixed plate; 62. First rotating arm; 63. Second rotating arm; 64. Pulling rod; 65. Rotating shaft; 66. Clamping motor; 67. Belt; 68. Driven pulley; 69. Card strip; 610. Hard shell; 611. Soft shell; 7. Clamping button; 8. Clockwise button; 9. Counterclockwise button; 10. Charging port; 11. Pressure display. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0020] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example 1 like Figures 1-6 As shown, the device for replacing a single fuse in a built-in PT cabinet includes a control terminal 1, a drive structure, and a manipulator 6. The control terminal 1 drives the drive structure, thereby controlling the rotation of the manipulator 6, which is used to replace the operator's hand by reaching into the built-in PT cabinet to replace the fuse. The control terminal 1 is provided with a clamping button 7 for controlling the clamping action of the manipulator 6, a clockwise button 8 for controlling the clockwise rotation of the manipulator 6, a counterclockwise button 9 for controlling the counterclockwise rotation of the manipulator 6, a display for displaying the clamping pressure, and a release button for controlling the release action of the manipulator 6; these buttons can realize the effect of automatic clamping and rotation of the fuse tube, and the pressure value sensed by the pressure sensor is displayed on the pressure display 11. When the pressure reaches the threshold, the manipulator 6 will stop the pressure according to the self-sensing system. At this time, the operator uses the clockwise and counterclockwise buttons 9 to operate the drive shaft 5 to rotate 360° according to the on-site operation situation, and automatically rotates and replaces the PT fuse tube in the cabinet.

[0024] The control terminal 1 is provided with an operating handle 2 , and two operating handles 2 are provided and fixedly disposed at both ends of the control terminal 1 .

[0025] As a preferred example of the above embodiment, the operating handle 2 is provided with a groove for easy hand gripping.

[0026] As a preferred example of the above embodiment, an anti-slip rubber pad is provided on the operating handle 2 .

[0027] The driving structure includes a driving motor 3 , an output end of the driving motor 3 is connected to a transmission shaft 5 , and one end of the transmission shaft 5 is fixedly connected to the output end of the driving motor 3 .

[0028] A support rod 4 is fixedly provided on the control terminal 1 , and the support rod 4 is fixedly connected to the driving motor 3 .

[0029] The manipulator 6 includes a shell, a fixed plate 61, a first rotating arm 62, a second rotating arm 63, a pulling rod 64, a rotating shaft 65, and a pressure sensor. The fixed plate 61, the first rotating arm 62, the second rotating arm 63, the pulling rod 64, the rotating shaft 65, and the pressure sensor are arranged in the shell. There are two first rotating arms 62, which are symmetrically distributed. The first end of the first rotating arm 62 is rotatably connected to the fixed plate 61. The first end of the first rotating arm 62 is a circular plate with meshing teeth on the edge. The two meshing teeth on the first rotating arms 62 The teeth are engaged and connected, and the second end of the first rotating arm 62 and the first end of the second rotating arm 63 are rotatably connected. A clamping strip 69 is provided on the second end of the second rotating arm 63, and the clamping strip 69 is outside the shell. A pulling rod 64 is provided between the second rotating arm 63 and the fixed plate 61, and the first end of the pulling rod 64 is rotatably connected to the middle part of the second rotating arm 63, and the second end of the pulling rod 64 is rotatably connected to the fixed plate 61. A clamping motor 66 is provided in the shell, and the clamping motor 66 is used to drive the first rotating arm 62.

[0030] As a preferred example of the above embodiment, the clamping button 7 is used to control the forward and reverse rotation of the clamping motor 66 so that the clamping pressure of the manipulator 6 is maintained within a preset range.

[0031] As a preferred example of the above embodiment, the shell is divided into two sections. The first section is a hard shell 610, which is made of hard material. The hard shell 610 is fixedly connected to the second end of the transmission shaft 5. The second section of the shell is a soft shell 511, which is made of elastic material. The hard shell 610 and the soft shell 611 are adhered and fixed. The soft shell 611 can follow the movement and deformation of the first rotating arm 62 and the second rotating arm 63, and the clip 69 is located outside the shell.

[0032] As a preferred example of the above embodiment, the width of the first rotating arm 62 gradually decreases from the first end to the second end thereof.

[0033] As a preferred example of the above embodiment, the clamping strip 69 is an arc-shaped strip, and the arc-shaped concave surfaces of the two clamping strips 69 face each other to achieve clamping of the fuse.

[0034] As a preferred example of the above embodiment, the clip strip 69 is wrapped with a rubber layer.

[0035] As a preferred example of the above embodiment, the inner wall of the clamping strip 69 is provided with anti-slip grooves.

[0036] The pressure sensor is disposed on the card strip 69 . The pressure sensor is electrically connected to the pressure display 11 . The pressure detected by the pressure sensor is displayed by the pressure display 11 .

[0037] As a preferred example of the above embodiment, the first rotating arm 62 is connected to the fixed plate 61 through a connecting shaft, a driven wheel 68 is fixedly provided on one of the connecting shafts of the first rotating arm 62, a driving wheel is provided on the output shaft of the clamping motor 66, and the driving wheel and the driven wheel 68 are connected by a belt 67.

[0038] As a preferred example of the above embodiment, an alarm is provided within the control terminal 1, and the pressure sensor is provided with a maximum pressure threshold and a minimum pressure threshold. When the pressure value detected by the pressure sensor is less than the minimum threshold or greater than the maximum threshold, the alarm is triggered. A pressure value less than the minimum threshold indicates that the fuse is not clamped, and disassembly and assembly should not be performed at this time; a pressure value greater than the maximum threshold indicates that the clamping force is too strong, which may damage the fuse, or that the fuse has been installed. The pressure threshold alarm function can provide real-time indication of the clamping status, preventing the fuse from falling off or being damaged due to insufficient clamping force or overload.

[0039] The other end of the transmission shaft 5 is fixedly connected to the first section of the housing.

[0040] Specifically, the other end of the transmission shaft 5 and the first section of the housing are connected by bolts.

[0041] As a preferred example of the above embodiment, a rotating shaft 65 is provided on the fixed plate 61, and both ends of the rotating shaft 65 are fixedly connected to the inner wall of the first end section of the shell. The fixed plate 61 and the rotating shaft 65 are rotatably connected. A coil spring is provided between the fixed plate 61 and the rotating shaft 65, and the first end of the coil spring is fixedly connected to the fixed plate 61, and the second end of the coil spring is fixedly connected to the rotating shaft 65. When clamping the fuse tube, the fixed plate 61 can rotate along the rotating shaft 65 within a certain angle, and has an anti-shake function to prevent the operator from bumping into the fuse tube due to excessive hand movements.

[0042] During use, the operator holds the operating handle 2 with both hands, extends the manipulator 6 into the contact of the switch trolley, clamps the outer wall of the fuse tube with the double manipulator 6, places the support rod 4 horizontally, and keeps the transmission shaft 5 still. Press the clamping button 7 on the control terminal 1, the clamping motor 66 starts, and drives the manipulator 6 to clamp the fuse tube. When the pressure sensor transmits the pressure information to the pressure display 11 on the operation terminal, the pressure display 11 shows that the pressure reaches the specified range, confirming that the clamping is completed, press the counterclockwise button on the control terminal 1, and the counterclockwise button issues a command to rotate the transmission shaft 5 counterclockwise. The needle rotates, driving the manipulator 6 to rotate. The double manipulators 6 of the tool clamp the fuse in a direction perpendicular to the central axis of the fuse. Since the central axis of the fuse and the central axis of the support rod 4 are on the same horizontal line, the pressure applied by the double manipulators 6 clamps the top of the fuse, driving the fuse to rotate counterclockwise. The fuse is loosened under the action of the manipulator 6. After confirming that it has been unscrewed, hold the operating handle 2 to take out the damaged fuse. After taking it out, control the clamping motor 66 to reverse, so that the manipulator 6 releases and puts down the damaged fuse. This process is to control the angle pressure of the manipulator 6 to replace the fuse of the built-in PT cabinet.

[0043] After removing the damaged fuse tube and replacing it with a new one, the operator uses the manipulator 6 to clamp the fuse tube. According to the pressure displayed by the pressure display 11, the operator confirms that the clamping is completed, aligns it with the internal thread of the trolley switch contact, presses the clockwise button of the control terminal 1, and transmits the force from the support rod 4 to the drive motor 3. The drive motor 3 drives the transmission shaft 5 to drive the manipulator 6 to rotate and tighten the fuse tube. The manipulator 6 senses that the fuse tube has been installed in place, automatically stops rotating, and releases the manipulator 6. At this time, the tool is taken out as a whole using the operating handle 2.

[0044] The transmission shaft 5 can be extended to other working areas, allowing the manipulator 6 to have greater flexibility and a higher degree of freedom. In order to enable the manipulator 6 to be well installed on the actuator part, a direct-drive design method is adopted. This method can maximize the performance of the motor of the driving part, and the working size and gripping force can be flexibly adjusted according to the working environment in the station, solving the problem of clamping the fuse tube in a simple and efficient way. The present invention frees operators from complex and narrow working environments, reduces the risk of personnel being cut by broken fuse tubes, and improves work safety and reliability.

[0045] Example 2 Example 2 As a preferred embodiment, a method for replacing a primary fuse of a built-in PT cabinet is provided, using the aforementioned device for replacing a primary fuse of a built-in PT cabinet, and includes the following specific steps: Step 1: Insert the manipulator 6 into the built-in PT cabinet and pick up the damaged fuse; Step 2: The control terminal 1 drives the driving structure, which drives the manipulator 6 to rotate clockwise to unscrew the damaged fuse; Step 3: Clamp the replaced fuse on the manipulator 6 and insert it into the built-in PT cabinet; Step 4: The control terminal 1 drives the driving structure, which drives the manipulator 6 to rotate clockwise to install the replaced fuse; Step 5: Release the manipulator 6 and take it out of the built-in PT cabinet to complete the installation.

[0046] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. Built-in PT cabinet primary fuse replacement device, characterized by: The invention comprises a driving structure, a manipulator (6) and a control terminal (1), wherein the driving structure and the control terminal (1) are connected, the control terminal (1) is used to control the movement of the driving structure, the manipulator (6) is connected to the driving structure, and the driving structure drives the manipulator (6) to move.

2. The built-in PT cabinet primary fuse replacement device according to claim 1, characterized in that: The control terminal (1) is provided with a clamping button (7) for controlling the clamping action of the manipulator (6), a clockwise button (8) for controlling the clockwise rotation of the manipulator (6), a counterclockwise button (9) for controlling the counterclockwise rotation of the manipulator (6), a release button for controlling the release action of the manipulator 6, and a pressure display (11).

3. The built-in PT cabinet primary fuse replacement device according to claim 1, characterized in that: The driving structure comprises a driving motor (3), the output end of the driving motor (3) is connected to a transmission shaft (5), and one end of the transmission shaft (5) is fixedly connected to the output end of the driving motor (3).

4. The device for replacing a primary fuse of a built-in PT cabinet according to claim 3, characterized in that: A support rod (4) is fixedly provided on the control terminal (1), and the support rod (4) is fixedly connected to the drive motor (3).

5. The built-in PT cabinet primary fuse replacement device according to claim 1, characterized in that: The manipulator (6) includes a housing, a fixed plate (61), a first rotating arm (62), a second rotating arm (63), a pulling rod (64), a rotating shaft (65), and a pressure sensor. The fixed plate (61), the first rotating arm (62), the second rotating arm (63), the pulling rod (64), the rotating shaft (65), and the pressure sensor are arranged in the housing. Two first rotating arms (62) are provided and are symmetrically distributed. The first end of the first rotating arm (62) is rotatably connected to the fixed plate (61). The first end of the first rotating arm (62) is a circular plate with a peripheral edge. There are meshing teeth, and the meshing teeth on the two first rotating arms (62) are meshed and connected, the second end of the first rotating arm (62) and the first end of the second rotating arm (63) are rotatably connected, and a pulling rod (64) is provided between the second rotating arm (63) and the fixed plate (61), the first end of the pulling rod (64) and the middle part of the second rotating arm (63) are rotatably connected, and the second end of the pulling rod (64) and the fixed plate (61) are rotatably connected, and a clamping motor (66) is provided in the shell, and the clamping motor (66) is used to drive the first rotating arm (62).

6. The built-in PT cabinet primary fuse replacement device according to claim 5, characterized in that: The housing is divided into two sections, the first section is made of a hard material and is fixedly connected to the second end of the transmission shaft (5), and the second section of the housing is made of an elastic material.

7. The device for replacing a primary fuse of a built-in PT cabinet according to claim 5, characterized in that: The first rotating arm (62) is connected to the fixed plate (61) via a rotating shaft (65), a driven wheel (68) is provided on the rotating shaft (65) of one of the first rotating arms (62), a driving wheel is provided on the output shaft of the clamping motor (66), and the driving wheel and the driven wheel (68) are connected via a belt (67).

8. The device for replacing a primary fuse of a built-in PT cabinet according to claim 5, characterized in that: A clip strip is provided on the second end of the second rotating arm (63).

9. The device for replacing a primary fuse of a built-in PT cabinet according to claim 8, characterized in that: The clamping strips are arc-shaped strips, and the arc-shaped concave surfaces of the two clamping strips are opposite to each other.

10. A method for replacing a fuse in a built-in PT cabinet, characterized in that: The above-mentioned built-in PT cabinet primary fuse replacement device includes the following specific steps: Step 1: Insert the manipulator (6) into the built-in PT cabinet and pick up the damaged fuse; Step 2: The control terminal (1) drives the driving structure, which drives the manipulator (6) to rotate clockwise to unscrew the damaged fuse; Step 3: Clamp the replaced fuse on the manipulator (6) and insert it into the built-in PT cabinet; Step 4: The control terminal (1) drives the driving structure, which drives the manipulator (6) to rotate clockwise to install the replaced fuse; Step 5: Release the manipulator (6) and take the device out of the built-in PT cabinet to complete the installation.

Images