Underground coal mine electrical switch three-phase short circuit grounding device
By designing a three-phase short-circuit grounding device suitable for underground electrical switches, the safety hazards during the maintenance of high-voltage equipment were solved, a stable and reliable grounding connection was achieved, and the safety of underground workers and the continuity of production were ensured.
Patent Information
- Application Number
- CN202520160423.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-23
AI Technical Summary
During the maintenance of existing underground high-voltage equipment, the high-voltage three-phase short-circuit grounding device cannot be installed inside the underground switch due to the large size of the conductor contact head. The low-voltage short-circuit grounding device has poor insulation and is prone to falling off, posing a safety hazard and failing to guarantee the safety of the workers.
A three-phase short-circuit grounding device for underground electrical switches in coal mines was designed, including a connector, a connecting body, and a clamping block. The device is connected to the underground switch bolts through internal threads to ensure a tight connection. The stability of the conductor connection is achieved by rotating the movable connecting rod and the clamping block, increasing the contact area and preventing detachment.
It improves the safety and stability of underground high-voltage electrical operations, reduces the risk of accidents such as electric shock and explosion, protects the lives of workers, improves operational efficiency and production continuity, and complies with safety regulations.
Smart Images
Figure CN223785331U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of underground mining tools, especially relates to circuit detection device, concretely is coal mine underground electrical switch three -phase short -circuit grounding device. BACKGROUND
[0002] During the overhaul of the power system, safety measures must be taken to protect the operating personnel after the electrical equipment is powered off, and the wires in the work area should be installed with three short-circuit grounding devices.
[0003] The existing three short-circuit grounding devices are basically divided into high-voltage and low-voltage. The high-voltage short-circuit grounding device is composed of an epoxy resin rod, a conductor connector and a wire; the low-voltage short-circuit grounding device is composed of a spring clamp of an insulating handle and a wire.
[0004] The voltage level of the power supply in the coal mine is 10KV, 6KV, 1.14KV, 0.66KV, 0.127KV and below, and most of the electrical equipment uses a voltage source of 0.66KV and above. During the overhaul of 0.66KV-10KV electrical equipment, the corresponding voltage level of the electroscope is needed after the power is turned off, and then the high-voltage short-circuit grounding rod is discharged, and then the spring clamp of the insulating handle is used to clamp the connecting bolt for short-circuit grounding.
[0005] The conductor connector of the existing epoxy resin grounding rod is designed for the bare conductor connection of the ground high-voltage equipment, which is relatively large in size. The space in the control cavity of the underground switch is narrow, and maintenance activities need to be carried out, so the short-circuit grounding device cannot be hung. Moreover, the wiring cavity space of the switch is even narrower, and the exposed conductor is only one bolt (per phase), while the existing conductor connectors of the epoxy resin grounding rod are designed for ground conductor connection, which cannot be fixed with the wiring bolt in the underground switch and cannot be used. Therefore, only low-voltage short-circuit grounding devices can be used.
[0006] The low-voltage short-circuit grounding device should be applicable to low-voltage electrical equipment of 0.4KV and below, and the spring clamp of the insulating handle has poor insulation performance, and the hand is close to the conductor during operation, which has safety hazards. Moreover, the underground environment is harsh, and the spring clamp of the insulating handle is easily polluted by water, coal dust and other factors during long-term use, causing insulation to decrease, so there are safety hazards in using it on 0.66KV electrical equipment, and there are even greater safety hazards in using it on 1.14KV and above electrical equipment.
[0007] Furthermore, the spring clamp of the low-voltage insulating handle clamps the conductor bolt, and the exposed screw rod is short after the conductor bolt is pressed, so the spring clamp can only clamp a small part, and the spring clamp itself is connected with a wire, which is easy to fall off during use, and the conductor contact area is small and the load current is small, which increases the risk of electric shock.
[0008] If the high-voltage equipment in the well is overhauled, the electric test and discharge are sent, and the existing three short-circuit grounding devices have many unreliable factors, which cause great safety hazards to the personnel in the high-voltage electrical operation in the well. SUMMARY
[0009] The utility model discloses to solve the current high-voltage equipment in the well is overhauled, and the high-voltage three-phase short-circuit grounding device is big in conductor contact head volume, and the switch wiring cavity space is small in the well, and the wiring column bolt is small, cannot install and use, and the low-voltage short-circuit grounding device is poor in insulation, and the contact area is small and easy to fall off, and there are safety hazards, so the existing three short-circuit grounding devices cannot guarantee the safety of the operating personnel and a series of problems, and the utility model provides coal mine electrical switch three-phase short-circuit grounding device.
[0010] The utility model discloses the following technical scheme is realized:
[0011] Coal mine electrical switch three-phase short-circuit grounding device, including the connecting head, the bottom of connecting head is equipped with internal thread and is cooperated with the switch bolt in the well, the top bolt connection of connecting head has the connecting body, is equipped with the connecting cavity in the connecting body, is equipped with the movable connecting rod in the connecting cavity, the head of connecting rod is cooperated with the lower hexagon counterbore of the bottom of connecting cavity, the upper part of connecting cavity is connected with the wire clamping block with screw thread, and the bottom of wire clamping block is opened with the upper hexagon counterbore that is cooperated with the head of connecting rod.
[0012] When implementing, including the connecting head, the connecting head can be installed according to the size of the conductor bolt in the switch, the bottom of connecting head is equipped with internal thread and is cooperated with the switch bolt in the well, the screw thread connection is fully engaged, and the maximization of the conductor contact area is not possessed by the existing grounding equipment, so as to ensure that the connection is firm.
[0013] The top bolt connection of connecting head has the connecting body, is equipped with the connecting cavity in the connecting body, is equipped with the movable connecting rod in the connecting cavity, the head of connecting rod is cooperated with the lower hexagon counterbore of the bottom of connecting cavity, the upper part of connecting cavity is connected with the wire clamping block with screw thread, and the bottom of wire clamping block is opened with the upper hexagon counterbore that is cooperated with the head of connecting rod.
[0014] The upper part of connecting cavity is equipped with the internal thread that is cooperated with the external thread of wire clamping block, the wire clamping block is in high position, and the wire clamping block is abutted on the lower surface of the wiring sheet, the wire clamping block is in low position, and the gap is left between the wire clamping block and the wiring sheet, and the gap is left between the edge of the wiring sheet and the side wall of the connecting cavity.
[0015] The screw rod of the connecting rod is sleeved with a wire connecting nose above the wire clamping block, specifically, the wire connecting nose comprises a connecting pipe penetrating the connecting rod, the outer periphery of the connecting pipe is provided with a wire clamping block cover, one end of the connecting pipe is fixed with a pressing piece between the wire clamping block cover and the connecting body, the other end of the connecting pipe is fixed with a wire connecting piece, the central part of the pressing piece and the wire connecting piece are both provided with a through hole penetrating the connecting rod, and the edge of the wire connecting piece is connected with a ground wire connecting terminal.
[0016] Two wire clamping block covers are installed above the wire connecting nose, the wire clamping block cover comprises two identical fan-shaped wire clamping block covers, the wire clamping block covers are fixed on the upper surface of the connecting body through mounting bolts, the wire clamping block covers cover the upper surface of the wire clamping block, the tail of the screw rod of the connecting rod is installed at the end of the insulating rod and is fixed through a penetrating bolt, that is, the connecting rod is installed at the end of the insulating rod along the axial direction, the insulating rod still uses the epoxy resin rod in the prior art, has good insulation performance, and the end of the insulating rod is installed with the penetrating bolt along the radial direction.
[0017] In use, one end of the ground wire is connected with the grounding electrode, an operator wears insulating tools and holds the insulating rod with one hand, first presses the connecting head on the switch wire connecting bolt, presses the insulating rod, until the head of the connecting rod is embedded in the lower hexagonal counterbore, rotates the insulating rod, at this time, the connecting body drives the connecting head to rotate, so that the switch wire connecting bolt is screwed into the connecting head, and is screwed tightly until it is fixed, so that the device is connected with the switch wire connecting bolt. Then the insulating rod is pulled, the connecting rod is pulled out of the lower hexagonal counterbore, the insulating rod is continuously pulled backward, so that the head of the connecting rod is embedded in the upper hexagonal counterbore, the insulating rod is rotated, the wire clamping block is rotated on the upper part of the connecting cavity, and the wire clamping block is lifted upward to press the wire connecting nose. At this time, the exposed part of the wire connecting bolt of the switch is connected through the connecting head, the connecting body, the wire connecting nose and the ground wire, and has been completely connected with the ground.
[0018] When disassembling, first lower the wire clamping block, loosen the wire connecting nose, and then rotate the connecting body to disassemble it from the wire connecting bolt.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] The three-phase short-circuit grounding device for underground electrical switches in coal mines provided by this utility model ensures safety and ease of operation during the process of connecting equipment to a three-phase short-circuit grounding system. It greatly protects the lives of underground workers, reduces the risk of serious accidents such as electric shock and explosions caused by accidental energization, and avoids tragedies involving casualties. It improves the stability and reliability of underground high-voltage electrical operations, reduces work interruptions caused by potential safety issues, ensures the continuity of mine production, and reduces economic losses. It optimizes the safety of the working environment, enhances employees' sense of security and trust in their work environment, and is conducive to improving work efficiency and employee enthusiasm. Furthermore, it complies with safety regulations, helping enterprises avoid legal risks and administrative penalties due to safety issues and maintaining a good corporate image. Attached Figure Description
[0021] Figure 1 This is a schematic diagram showing the structure of the present invention.
[0022] Figure 2 express Figure 1 A cross-sectional view at point A in the middle.
[0023] Figure 3 express Figure 1 Schematic diagram of the cross section at point B.
[0024] Figure 4 This is a schematic diagram showing the structure of the wiring block cover.
[0025] In the diagram: 1-Connector, 2-Connector body, 3-Connector cavity, 4-Connector rod, 5-Lower hexagonal countersunk hole, 6-Wire clamp block, 7-Upper hexagonal countersunk hole, 8-Wire lug, 801-Connector tube, 802-Pressure plate, 803-Wire connecting piece, 804-Ground terminal, 9-Wire connecting block cover, 901-Wire connecting block baffle, 10-Insulating rod, 11-Pin bolt. Detailed Implementation
[0026] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.
[0027] Three-phase short-circuit grounding device for electrical switches in underground coal mines, such as Figures 1-4 As shown: including connector 1, connector 1 can be installed according to the size of the conductor bolt inside the switch. The bottom end of connector 1 is provided with internal thread to cooperate with the bolt of the downhole switch. The threaded connection is fully engaged, and the maximum conductor contact area is something that existing grounding equipment cannot achieve, ensuring a tight connection.
[0028] The top end of the connecting head 1 is bolted with a connecting body 2, the connecting body 2 is provided with a connecting cavity 3, the connecting cavity 3 is provided with a movable connecting rod 4, the head of the connecting rod 4 cooperates with a lower hexagonal counterbore 5 at the bottom of the connecting cavity 3, the upper part of the connecting cavity 3 is threadedly connected with a wire clamping block 6, specifically, the upper part of the connecting cavity 3 is provided with internal threads matched with the external threads of the wire clamping block 6, when the wire clamping block 6 is in a high position, the wire clamping block 6 abuts against the lower surface of a wire connecting piece 803; when the wire clamping block 6 is in a low position, the wire clamping block 6 leaves a gap with the wire connecting piece 803; a gap is left between the edge of the wire connecting piece 803 and the side wall of the connecting cavity 3;
[0029] The bottom end of the wire clamping block 6 is provided with an upper hexagonal counterbore 7 matched with the head of the connecting rod 4; the rotation of the connecting rod 4 can drive the rotation of the connecting head 1, so that the device is bolted with a conductor, and the wire clamping block 6 can press a wire connecting nose 8 tightly, at the same time, when the conductor bolt is screwed into the connecting head 1, the wire connecting nose 8 can rotate freely, so that the grounding wire cannot be wound around the insulating rod;
[0030] The screw rod of the connecting rod 4 is sleeved with the wire connecting nose 8 above the wire clamping block 6, specifically, the wire connecting nose 8 includes a connecting pipe 801 penetrating the connecting rod 4, the outer periphery of the connecting pipe 801 is provided with a wire clamping block cover 9, one end of the connecting pipe 801 is fixedly provided with a pressing piece 802, the pressing piece 802 is located between the wire clamping block cover 9 and the connecting body 2; the other end of the connecting pipe 801 is fixedly provided with a wire connecting piece 803, the center of the pressing piece 802 and the wire connecting piece 803 is provided with a through hole penetrating the connecting rod 4, the edge of the wire connecting piece 803 is connected with a grounding wire connecting terminal 804;
[0031] Two wire clamping block covers 9 are installed above the wire connecting nose 8, the wire clamping block cover 9 includes two identical fan-shaped wire clamping block pieces 901, the wire clamping block piece 901 is fixed on the upper surface of the connecting body 2 through a mounting bolt, the wire clamping block piece 901 covers the upper surface of the wire clamping block 6, the screw rod tail of the connecting rod 4 is installed at the end of an insulating rod 10 and is fixed through a penetrating pin bolt 11, that is, the connecting rod 4 is installed at the end of the insulating rod 10 along the axial direction, the insulating rod still uses the epoxy resin rod in the prior art, and has good insulation performance, the end of the insulating rod 10 is installed with the penetrating pin bolt 11 along the radial direction.
[0032] In use, connect one end of the grounding wire to the grounding electrode. After wearing insulating gear, the operator holds the insulating rod 10 with one hand, first pressing the connector 1 against the switch wiring bolt, pressing the insulating rod 10 until the head of the connecting rod 4 is inserted into the lower hexagonal countersunk hole 5. Rotate the insulating rod 10, at which point the connecting body 2 drives the connector 1 to rotate, causing the switch wiring bolt to be screwed into the connector 1 until it is tightened and cannot be moved, thus connecting the device to the switch wiring bolt. Then pull the insulating rod 10 to pull the connecting rod out of the lower hexagonal countersunk hole 5, and continue to pull the insulating rod 10 backward so that the head of the connecting rod 4 is inserted into the upper hexagonal countersunk hole 7. Rotate the insulating rod 10, and the connecting rod 4 drives the clamping block 6 to rotate in the upper part of the connecting cavity 3. The clamping block 6 rises up and presses the wiring lug 8 tightly. At this time, the exposed part of the switch wiring bolt is completely connected to the ground through the connector 1, the connecting body 2, the wiring lug 8, and the grounding wire.
[0033] When removing the connector, first lower the clamp block 6, loosen the connector lug 8, and then rotate the connector body 2 to remove it from the connector bolt.
[0034] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A three-phase short-circuit grounding device for underground electrical switches in coal mines, characterized in that: The device includes a connector (1), the bottom of which is provided with an internal thread to engage with a downhole switch bolt. The top of the connector (1) is bolted to a connecting body (2). The connecting body (2) is provided with a connecting cavity (3). The connecting cavity (3) is provided with a movable connecting rod (4). The head of the connecting rod (4) engages with a lower hexagonal countersunk hole (5) at the bottom of the connecting cavity (3). The upper part of the connecting cavity (3) is threaded to a wire clamping block (6). The bottom of the wire clamping block (6) is provided with an upper hexagonal countersunk hole (7) to engage with the head of the connecting rod (4). A wire lug (8) is fitted on the screw of the connecting rod (4) above the wire clamping block (6). Two wire block covers (9) are installed above the wire lug (8). The tail of the screw of the connecting rod (4) is installed at the end of an insulating rod (10) and fixed by a through bolt (11).
2. The three-phase short-circuit grounding device for underground electrical switches in coal mines according to claim 1, characterized in that: The wiring lug (8) includes a connecting tube (801) through which the connecting rod (4) passes. A wiring block cover (9) is provided on the outer periphery of the connecting tube (801). A pressure plate (802) is fixed at one end of the connecting tube (801). The pressure plate (802) is located between the wiring block cover (9) and the connecting body (2). A wiring piece (803) is fixed at the other end of the connecting tube (801). A through hole through which the connecting rod (4) passes is opened in the center of both the pressure plate (802) and the wiring piece (803). A ground wire terminal (804) is connected to the edge of the wiring piece (803).
3. The three-phase short-circuit grounding device for underground electrical switches in coal mines according to claim 2, characterized in that: The upper part of the connecting cavity (3) is provided with an internal thread that mates with the external thread of the clamping block (6). When the clamping block (6) is in a high position, the clamping block (6) rests against the lower surface of the connector (803). When the clamping block (6) is in a low position, there is a gap between the clamping block (6) and the connector (803).
4. The three-phase short-circuit grounding device for underground electrical switches in coal mines according to claim 2, characterized in that: A gap is left between the edge of the connector (803) and the side wall of the connecting cavity (3).
5. The three-phase short-circuit grounding device for underground electrical switches in coal mines according to claim 1, characterized in that: The connector block cover (9) includes two identical fan-shaped connector block covers (901), which are fixed to the upper surface of the connecting body (2) by mounting bolts and cover the upper surface of the clamping block (6).
6. The three-phase short-circuit grounding device for underground electrical switches in coal mines according to claim 1, characterized in that: The connecting rod (4) is axially mounted at the end of the insulating rod (10), and the end of the insulating rod (10) is radially mounted with a through bolt (11).