CN105006661A - Grounding device - Google Patents

Abstract

The invention provides a grounding device, which includes an insulation puncture grounding clamp, a grounding ring, a puncture pressure control mechanism, a puncture pressure adjustment mechanism, a driving mechanism and an electrical control system. The insulation puncture grounding clamp includes an upper casing, a lower casing and a telescopic Pull rod, nut, puncture pressure control mechanism includes floating gear, sleeve and puncture limit switch, floating gear and sleeve contact end form a ratchet structure, puncture pressure adjustment mechanism is torque setting spring, electrical control system includes power module, microcontroller , a high-voltage electrodetection module and a remote control transceiver module, the driving mechanism includes a drive motor and a transmission gear, and the drive motor, puncture travel switch, high-voltage electrodetection circuit and remote control receiving circuit are respectively electrically connected to the microcontroller. The invention can fundamentally eliminate the potential safety hazards existing in the grounding treatment of the transmission lines, reduce the labor intensity of operators, and improve work efficiency.

Description

a grounding device

【Technical field】

The invention relates to a grounding jig for piercing an insulated wire, in particular to a grounding device for grounding a high-voltage insulated wire.

【Background technique】

In recent years, the use of overhead insulated conductors has become more and more popular. According to the requirements of the safety regulations of the electric power industry, in order to ensure the safety of the operation, before the maintenance or repair of the transmission line, it is necessary to use the grounding clamp on the premise of confirming that the transmission line is powered off. The transmission lines to be repaired shall be grounded. Since overhead insulated wires are covered with insulating sheaths, they cannot be grounded as conveniently as ordinary steel-cored aluminum stranded wires.

At present, the insulation piercing grounding clip commonly used for the grounding treatment of high-voltage insulated wires at home and abroad has the advantages of live work, no need to peel, good self-sealing and small electrical contact resistance, but its disadvantages are also obvious. , mainly: the puncture operation needs to be performed manually, the puncture pressure is not easy to control, and the operation is difficult when working at heights. Moreover, when performing the puncture operation, the operator's body needs to be in direct contact with the insulating puncture grounding clamp. If there is a quality defect in the insulation piercing grounding clamp, and the power transmission line is not cut off, it may also endanger the personal safety of the operator. Therefore, it is of great practical significance to study a fast, efficient and reliable grounding fixture for overhead insulated conductors.

【Content of invention】

The technical problem to be solved by the present invention is to provide a grounding device for the problems existing in the prior art, which can quickly, efficiently and reliably perform grounding puncture operations on overhead insulated conductors through remote control, and automatically and precisely control the puncture force , eliminating the electrical inspection operation before the ground wire is hooked up.

The technical problem to be solved in the present invention is achieved by the following technical solutions: a grounding device, including an insulation puncture grounding clamp, a grounding ring, a puncture pressure control mechanism, a puncture pressure adjustment mechanism, a driving mechanism and an electrical control system, the insulation puncture The ground clamp includes an upper shell, a lower shell, and telescopic pull rods and nuts that form threaded flexible connections. The piercing parts of the upper shell and/or the lower shell are fixedly equipped with metal piercing teeth, and the piercing pressure control mechanism includes The floating gear, the sleeve and the puncture limit switch, the floating gear and the contact end of the sleeve form a ratchet structure through intermeshing grooves and protruding teeth, the other end of the sleeve is connected to the nut, and the puncture pressure adjustment mechanism is connected with the The torque setting spring connected by the floating gear, the electrical control system includes a power supply module, a microcontroller, a high-voltage electro-detection module composed of a high-voltage electro-detection circuit and an alarm device, and a remote-control transceiver module composed of a remote-control receiving circuit and a remote controller, The driving mechanism includes a driving motor and a transmission gear, the transmission gear is meshed with the floating gear for transmission, and the driving motor, puncture travel switch, high-voltage electric test circuit and remote control receiving circuit are respectively electrically connected to the microcontroller.

Preferably, the high-voltage electrometry circuit includes triodes Q1, Q2 and their load resistors and a detection button S1, the bases of the triodes Q1 are electrically connected to one end of the load resistors R1, R2, and R3 respectively, and the load resistors R1 The other end is electrically connected to the grounding ring, the other end of the load resistor R2 is grounded, the other end of the load resistor R3 is connected to the detection button S1, the collector of the triode Q1 is connected to one end of the load resistor R4, and the emitter of the triode Q1 Grounded and connected to one end of the load resistor R5 at the same time, the base of the triode Q2 is connected to the other end of the load resistor R4, its emitter is connected to the detection button S1 and connected to the power module at the same time, its collector is electrically connected to the microcontroller and simultaneously Connect with the other end of the load resistor R5.

Preferably, the piercing portion on the upper casing is arc-shaped, and the piercing portions of the upper metal piercing tooth ring fixedly connected to the piercing portion are arranged.

Preferably, the piercing portion on the lower casing is arc-shaped, and the piercing portions of the lower metal piercing tooth ring fixedly connected to the piercing portion are arranged.

Preferably, there are two sets of telescopic pull rods and nuts, and two sets of ratchet structures formed by the floating gears and sleeves.

Preferably, the drive mechanism further includes a planetary gear reduction mechanism consisting of a drive gear and a reduction gear, the reduction gear and the transmission gear are connected in series through a gear shaft, the drive gear is fixedly installed on the output shaft of the drive motor and Mesh transmission with reduction gear.

Preferably, the power supply module includes a rechargeable battery and a battery charging circuit, and the rechargeable battery is electrically connected to the remote control receiving circuit, the microcontroller, and the high voltage test circuit respectively.

Preferably, the rechargeable battery is a high-power rechargeable lithium battery.

Preferably, the micro-controller, the high-voltage test circuit, the alarm device and the remote control receiving circuit are all integrated on the circuit board.

Preferably, the alarm device adopts LED alarm lights or sound alarms.

Compared with the prior art, the beneficial effect of the present invention is that the puncturing action and the loosening action of the insulation puncture grounding clamp can be controlled by the remote control transceiver module, and the puncturing force can be automatically and accurately controlled by the puncturing pressure control mechanism and the puncturing pressure regulating mechanism. Control, avoiding the damage to the core body of the transmission wire when the fixture is working, so that the operator can complete the maintenance or repair of the power line, especially the high-voltage transmission line, in a non-direct contact operation mode, and fundamentally eliminates the grounding of the transmission line The potential safety hazards that may exist during the processing effectively reduce the labor intensity of the operators and improve the work efficiency of the operators; at the same time, the remote puncture and high-voltage electrical inspection instructions can be integrated through the high-voltage electrical inspection module, and the puncture operation At the same time, the live condition of the transmission line is confirmed, so that the electric inspection operation before the ground wire is connected can be exempted, and the maintenance operation efficiency of the transmission line is improved.

【Description of drawings】

Fig. 1 is a front view (unclamped puncture state) of a grounding device of the present invention.

Fig. 2 is a side view (unclamped puncture state) of a grounding device of the present invention.

Fig. 3 is a front view (clamping and puncturing state) of a grounding device of the present invention.

Fig. 4 is a side view (clamping and puncturing state) of a grounding device of the present invention.

Fig. 5 is a top view of a grounding device of the present invention.

Fig. 6 is a sectional view rotated along the direction A-A in Fig. 5 .

Fig. 7 is a working principle block diagram of a grounding device of the present invention.

Fig. 8 is a circuit structure diagram of the high-voltage electric test circuit in Fig. 7 .

Marks in the figure: 1-telescopic pull rod, 2-upper housing, 3-return spring, 4-lower housing, 5-movable pressure plate, 6-fastening bolt, 7-installation bracket, 8-limiting support, 9 -floating gear, 10-gear seat, 11-driving gear, 12-base, 13-driving motor, 14-gear shaft, 15-reduction gear, 16-transmission gear, 17-torque setting spring, 18-puncture limit switch , 19-sleeve, 20-nut, 21-upper metal piercing tooth, 22-grounding ring, 23-battery, 24-circuit board, 25-electrical control box, 26-antenna, 27-lower metal piercing tooth, 28- Insulated conductors to be pierced.

【Detailed ways】

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

A grounding device as shown in Figure 1, Figure 2, Figure 5, and Figure 6 mainly includes an insulation piercing grounding clamp, a grounding ring 22, a piercing pressure control mechanism, a piercing pressure regulating mechanism, a driving mechanism, and an electrical control system. The above-mentioned insulation piercing ground clamp includes a telescopic pull rod 1, an upper casing 2, a return spring 3, a lower casing 4 and a nut 20, wherein the telescopic pull rod 1 runs through the opposite upper casing 2, the lower casing 4 and then connects with the nut 20 to form a threaded flexible connection, the return spring 3 is located between the upper casing 2 and the lower casing 4 and is socketed with the telescopic pull rod 1, and the lower casing 4 is fixedly installed on the U-shaped On the mounting bracket 7, in order to prevent the lower case 4 from being pinched, a square movable platen 5 can be set between the lower case 4 and the mounting frame 7, and the movable platen 5 can increase the distance between the fastening bolt 6 and the lower case 4. The contact area can avoid the lower casing 4 from being pinched. Both ends of the upper case 2 and the lower case 4 are puncture parts, the puncture parts on the upper case 2 are fixedly connected with the upper metal puncture teeth 21, and the puncture parts on the lower case 4 are fixedly connected with the lower metal puncture teeth 27 .

The puncture pressure control mechanism includes a floating gear 9, a sleeve 19 and a puncture limit switch 18. The bottom of the mounting bracket 7 is fixedly connected to a limit support 8, and the limit support 8 is fixedly connected to the gear seat 10. The top end of the gear seat 10 is fixedly connected with the base 12 at the bottom end. The floating gear 9 is located in the internal cavity jointly defined by the limit support 8 and the gear seat 10, and the floating gear 9 can move linearly up and down relative to the limit support 8 and the gear seat 10. The sleeve The cylinder 19 is fixedly installed in the internal cavity jointly defined by the mounting bracket 7 and the limit support 8 , and the puncture limit switch 18 is fixedly installed on the gear seat 10 . The floating gear 9 and the sleeve 19 are all hollow structures, so that the telescopic pull rod 1 can move up and down in a straight line relative to the floating gear 9 and the sleeve 19; Teeth, the contact end of floating gear 9 and sleeve 19 forms a ratchet structure through mutually meshing grooves and protruding teeth, and a groove is provided at the top of sleeve 19, and the nut 20 is located in the groove at the top of sleeve 19. In order to facilitate the assembly and disassembly of the insulation piercing grounding clamp as a whole and the mounting bracket 7, the nut 20 and the sleeve 19 are preferably connected to each other in a clearance fit manner.

The puncture pressure regulating mechanism is a torque setting spring 17, and the torque setting spring 17 is installed in the internal cavity jointly defined by the floating gear 9 and the gear seat 10, and its two ends are connected with the floating gear 9 and the gear seat respectively. 10 contact connections. The torque setting spring 17 has the function of adjusting the puncture pressure. By selecting springs of different materials, wire diameters, and turns, different puncture pressure values can be set to adapt to the puncture required by different high-voltage insulated wires. force.

The electrical control system includes a power supply module, a microcontroller, a high-voltage electrical inspection module composed of a high-voltage electrical inspection circuit and an alarm device, and a remote control transceiver module composed of a remote control receiving circuit and a remote controller. The specific structure of the high-voltage electrometry circuit is shown in Figure 8, including triodes Q1, Q2 and their load resistors and detection button S1, the bases of the triode Q1 are respectively electrically connected to one end of the load resistors R1, R2, R3, The other end of the load resistor R1 is electrically connected to the grounding ring 22, the other end of the load resistor R2 is grounded, the other end of the load resistor R3 is connected to the detection button S1, and the collector of the triode Q1 is connected to one end of the load resistor R4. The emitter of the transistor Q1 is grounded and connected to one end of the load resistor R5 at the same time, the base of the transistor Q2 is connected to the other end of the load resistor R4, its emitter is connected to the detection button S1 and connected to the power module at the same time, its collector is connected to the micro The controller is electrically connected and simultaneously connected to the other end of the load resistor R5. The detection button S1 is a test button of a high-voltage electrometry circuit. When it is pressed, it is forced to connect the upper bias resistor R3 to the triode Q1, so that the triodes Q1 and Q2 are turned on, and the introduction of high voltage is simulated. The detection button S1 is used for Test the high-voltage electrical inspection circuit in an offline state. The power module includes a rechargeable battery 23 and a battery charging circuit, and the rechargeable battery 23 is electrically connected to a remote control receiving circuit, a microcontroller, and a high-voltage electric testing circuit, respectively. In particular, the rechargeable battery 23 is a high-power rechargeable lithium battery. The use of such a power module can not only make the puncture grounding fixture of the present invention light in weight and small in size, but also facilitate transmission line workers to easily use insulating rods to hook it to insulated wires, and can also ensure that the puncture grounding fixture has a non-low 3 years standby life. In order to further reduce the overall weight and volume of the puncture grounding fixture of the present invention, a microcontroller, a high-voltage electric test circuit, an alarm device and a remote control receiving circuit can all be integrated on the circuit board 24, the circuit board 24, the battery 23 All are fixed inside the electrical control box 25, and the antenna 26 in the remote control receiving circuit is exposed to the electrical control box 25, and the electrical control box 25 is located on the outside of the limit support 8 and the gear seat 10, as shown in Figure 2, This not only helps to improve the structural compactness of the puncture grounding fixture, reduces its weight and volume, but also helps to improve the safety of the puncture grounding fixture and ensure its working reliability. The alarm device uses LED alarm lamps or sound alarms to indicate high voltage, so that operators can confirm the liveliness of the line while performing puncture operations, and fundamentally ensure the personal safety of operators.

Described driving mechanism comprises driving motor 13, transmission gear 16 and the planetary gear reduction mechanism that is made up of driving gear 11, reduction gear 15, and described transmission gear 16 and reduction gear 15 are connected in series by gear shaft 14, and described driving gear 11 It is fixedly installed on the output shaft of the driving motor 13 and is engaged with the reduction gear 15 for transmission, and the transmission gear 16 is engaged with the floating gear 9 for transmission. The drive motor 13, the puncture travel switch 18, the high-voltage electric test circuit and the remote control receiving circuit are respectively electrically connected to the microcontroller. Wherein drive motor 13 adopts high-torque micro DC motor, to help reduce the overall weight and volume of puncture grounding fixture; A power amplifier circuit is electrically connected between the driving motor 13 and the microcontroller, as shown in FIG. 7 .

The working process of the puncture grounding jig of the present invention is as follows: in the early stage of the puncture action, as shown in Figure 2, a sufficient distance is maintained between the upper casing 2 and the lower casing 4, and the ratchet structure formed by the floating gear 9 and the sleeve 19 is in the position of In the meshing state, the grounding ring 22 is hung on the lower metal puncture teeth 27 on the lower casing 4, and then the puncture grounding jig is suspended to the position to be punctured on the insulated wire 28 to be punctured by using the insulating rod, so that the outside of the insulated wire 28 to be punctured The surface is in contact with the upper metal piercing teeth 21 on the upper casing 2 , and the grounding ring 22 and the insulated wire 28 to be pierced are respectively located on both sides of the telescopic pull rod 1 .

The remote controller sends a puncture command signal to the microcontroller, and the start signal from the microcontroller starts the driving motor 13, and the driving gear 11 on the output shaft of the driving motor 13 drives the reduction gear 15 to rotate, and the transmission gear 16 and the reduction gear 15 rotate synchronously. Drive the floating gear 9 to rotate, the floating gear 9 drives the sleeve 19 to rotate, and the sleeve 19 drives the nut 20 to rotate, so that the telescopic rod 1 moves downward in a straight line relative to the sleeve 19, thereby driving the upper shell 2 to move in a 4-way direction relative to the lower shell. During the downward movement, the upper metal piercing teeth 21 pierce the insulation sheath of the insulated wire 28 to be punctured and contact the metal core of the wire after being pressed, and the lower metal piercing teeth 27 pierce the insulation sheath of the grounding ring 22 and contact with the wire metal core after being pressed. Metal core contacts. The puncture pressure control mechanism on the puncture grounding fixture controls the puncture pressure according to the preset value of the torque setting spring 17. When the puncture pressure reaches the preset value, the end face ratchet composed of the floating gear 9 and the sleeve 19 is tripped to overcome the torque setting. The thrust of the fixed spring 17 moves downward, and presses down the puncture travel switch 18 on the corresponding side, so that the floating gear 9 and the ratchet of the sleeve 19 slip each other, and the puncture grounding fixture is in the clamping and puncturing state, as shown in Figure 3 and Figure 4 . The action signal of the puncture limit switch 18 is output to the microcontroller, which controls the driving motor 13 to stop running, and the puncture is completed. After the puncture is completed, the remote controller can send a loosening command signal to the microcontroller, and the microcontroller sends a reverse signal to the drive motor 13, and the drive motor 13 starts to rotate in the opposite direction, so that the upper housing 2 is relatively opposite to the lower shell. The casing 4 moves upward until the distance between the upper casing 2 and the lower casing 4 returns to the normal level before puncturing.

Considering that the cross section of the insulated wire 28 to be punctured and the grounding ring 22 are generally circular structures, the piercing portion on the upper housing 2 can be arranged in an arc shape, and the upper metal piercing teeth 21 fixedly connected to the piercing portion are arranged in a ring. Similarly, the piercing portion on the lower housing 4 can also be arranged in an arc shape, and the lower metal piercing teeth 27 fixedly connected to the piercing portion are arranged around the piercing portion, as shown in FIG. 2 . Therefore, when the upper casing 2 moves downward relative to the lower casing 4 to the clamping and puncturing state as shown in Figure 4, the upper casing 2 and the lower casing 4 can be connected with the insulated wire 28 to be punctured and grounded in the covered state. Ring 22 contacts, increased the contact area between the puncture portion on the upper casing 2, the lower casing 4 and the insulated wire 28 to be punctured, and the grounding ring 22, ensured that the puncture point is in contact stably, and improved the insulated wire 28 to be punctured, the grounding ring 22, and the contact area. The clamping and piercing stability of the ring 22 makes it easier for the upper metal piercing teeth 21 and the lower metal piercing teeth 27 to pierce the insulating sheath of the insulated wire 28 to be pierced and the grounding ring 22, which is conducive to reducing the overall performance of the piercing grounding fixture consumption.

In order to prevent the upper casing 2 from deflecting or rotating during the movement relative to the lower casing 4, as shown in Figure 1, Figure 3, and Figure 5, two sets of telescopic pull rods 1 and nuts 20 of the same structure can be provided, correspondingly Specifically, two sets of floating gears 9 and sleeves 19 with the same structure are provided, that is, two sets of ratchet structures with the same structure are provided, and the two telescopic pull rods 1 are arranged in parallel, thereby effectively preventing the upper shell 2 from occurring relative to the lower shell 4. Deviating or rotating to ensure the working stability and reliability of the puncture grounding fixture. The two floating gears 9 are also arranged in parallel and meshed with the transmission gear 16 for transmission at the same time. Two puncture travel switches 18 are fixedly installed on the gear seat 10. The two puncture travel switches 18 are respectively electrically connected to the microcontroller, and the induced action The signals are all output to the micro-controller, and when the micro-controller detects that the two puncture limit switches 18 are all actuated, the micro-controller controls the drive motor 13 to stop running, and the puncture is completed. Adopting such a structure makes the whole machine structure of the puncture grounding fixture more compact, and the clamping and puncturing action is more stable and reliable, and the output effective puncture pressure is also larger, which is beneficial to reduce the energy consumption of the whole machine of the puncture grounding fixture. After testing, the power consumption of the whole machine can be controlled below 0.5mW.

The upper metal piercing teeth 21 and the lower metal piercing teeth 27 are also used as high-voltage detection probes. When they pierce the insulating sheath and contact the metal core, if the wire 28 has high voltage, it will pass through the upper metal piercing teeth 21 and the lower metal piercing teeth. The piercing teeth 27 conduct the high voltage to the grounding ring 22 , and the high-voltage detection terminal of the high-voltage electroscope circuit is connected to the grounding ring 22 . As shown in Figure 8, when there is no high-voltage input, both transistors Q1 and Q2 are cut off, and the high-voltage electrometry circuit outputs a low level to the microcontroller; when there is a high-voltage input, the high voltage is divided by resistors R1 and R2 and then led to the transistor Q1 The base makes the triode Q1 conduct, and then the triode Q2 also conducts, and the high-voltage electric test circuit outputs a high level to the microcontroller. When the microcontroller detects that the output of the high-voltage electrometry circuit is at a high level, it can determine that the wire 28 is charged, and then the output signal drives the alarm device to send out a light signal or an acoustic signal for high-voltage alarm indication. If the alarm device does not send out a light signal or an acoustic signal for high-voltage alarm indication, then the ground wire connection operation can be safely performed. In this way, by integrating the high-voltage electrical inspection indication with the remote control puncture, the liveliness status of the line can be confirmed during the puncture operation, thereby eliminating the electrical inspection operation before the ground wire is connected, and improving the work efficiency of line maintenance.

The puncture grounding jig of the present invention is compact in structure, light in weight, and small in size, and transmission line maintenance personnel can easily use an insulating rod to hang it on the site to be punctured on the insulated wire 28 to be punctured. Since the puncture grounding fixture adopts a remote control transceiver module composed of a remote control receiving circuit and a remote control, it has strong anti-interference ability, and the operator can perform remote control operation on the ground, which is convenient and simple. This non-contact operation method fundamentally guarantees personal safety. The puncture pressure can be precisely controlled by the puncture pressure control mechanism and the puncture pressure adjustment mechanism, so that the puncture pressure is moderate, the puncture point is in stable contact, and no damage to the wire core is guaranteed. Therefore, in the power line inspection and maintenance work, the use of the puncture grounding clamp of the present invention can effectively improve the work efficiency of the operators and reduce the labor intensity of the operators.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. It should be noted that any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should include Within the protection scope of the present invention.

Claims (10)

1. an earthing device, it is characterized in that: comprise insulating puncturing earthing clamp, ground loop (22), puncture pressure control mechanism, puncture pressure regulating mechanism and driving mechanism and electric control system, described insulating puncturing earthing clamp comprises upper shell (2), the telescopic lever (1) that lower house (4) and composition screw thread are flexibly connected, nut (20), the puncture portion fixed installation metallic puncture tooth of described upper shell (2) and/or lower house (4), described puncture pressure control mechanism comprises floating gear (9), sleeve (19) and puncture travel switch (18), described floating gear (9) and sleeve (19) contact jaw are by intermeshing groove, double wedge forms ratchet structure, described sleeve (19) other end is connected with nut (20), described puncture pressure regulating mechanism is the torque setting spring (17) be connected with floating gear (9), described electric control system comprises power module, microcontroller, the high voltage testing module be made up of high voltage testing circuit and warning device and the remote control transceiver module be made up of remote-control receiving circuit and remote controller, described driving mechanism comprises drive motors (13) and travelling gear (16), described travelling gear (16) and floating gear (9) engaged transmission, described drive motors (13), puncture travel switch (18), high voltage testing circuit and remote-control receiving circuit are electrically connected with microcontroller respectively.

2. earthing device according to claim 1, it is characterized in that: described high voltage testing circuit comprises triode Q1, Q2 and load resistance thereof and test button S1, the base stage of described triode Q1 respectively with load resistance R1, R2, one end electrical connection of R3, the described load resistance R1 other end is electrically connected with ground loop (22), described load resistance R2 other end ground connection, described another termination of load resistance R3 test button S1, the collector electrode of described triode Q1 is connected with load resistance R4 one end, the grounded emitter of described triode Q1 and being simultaneously connected with load resistance R5 one end, the base stage of described triode Q2 is connected with the load resistance R4 other end, its emitter connects test button S1 and is connected with power module simultaneously, its collector electrode is electrically connected with microcontroller and is connected with the load resistance R5 other end simultaneously.

3. the earthing device according to claims 1 or 2, is characterized in that: the puncture portion on described upper shell (2) is curved, is fixedly connected on upper metal puncture tooth (21) the ring puncture portion arrangement in puncture portion.

4. the earthing device according to claims 1 or 2, is characterized in that: the puncture portion on described lower house (4) is curved, is fixedly connected on lower metal puncture tooth (27) the ring puncture portion arrangement in puncture portion.

5. the earthing device according to claims 1 or 2, it is characterized in that: described telescopic lever (1) and nut (20) arrange two groups, the ratchet structure that described floating gear (9) and sleeve (19) are formed also arranges two groups.

6. earthing device according to claim 1, it is characterized in that: described driving mechanism also comprises the planetary gear reducing mechanism be made up of driven wheel (11), reduction gearing (15), described reduction gearing (15) is connected in series by gear shaft (14) with travelling gear (16), on the output shaft that described driven wheel (11) is fixedly mounted on drive motors (13) and with reduction gearing (15) engaged transmission.

7. earthing device according to claim 1, it is characterized in that: described power module comprises rechargeable battery (23) and battery charger, described rechargeable battery (23) is electrically connected with remote-control receiving circuit, microcontroller, high voltage testing circuit respectively.

8. earthing device according to claim 7, is characterized in that: described rechargeable battery (23) adopts high power chargeable lithium cell.

9. the earthing device according to claims 1 or 2, is characterized in that: described microcontroller, high voltage testing circuit, warning device and remote-control receiving circuit are all integrated on circuit board (24).

10. earthing device according to claim 9, is characterized in that: described warning device adopts LED alarm lamp or voice guard.