A seven-core cable automatic heating and dehumidification device for mining

Abstract

The invention discloses a mine-used seven-core cable automatic temperature rise dehumidification and moisture absorption device, comprising a 10KV AC power supply, a 10KV current-increasing transformer, a converter, a 50V nine-pulse DC output device, a 2000V DC output device, and a sealed dehumidification and moisture absorption drying box, wherein the 10KV AC power supply is sequentially connected to the 10KV current-increasing transformer and the converter, and the converter is simultaneously connected to the 50V nine-pulse DC output device and the 2000V DC output device, and the 50V nine-pulse DC output device and the 2000V DC output device are both connected to the conductor core of the mine-used seven-core cable. The invention has a reasonable structural design, and by energizing the mine-used coal machine seven-core cable, the conductor is heated under the action of the DC current to achieve a temperature rise effect. The temperature is reasonably controlled, so that it is conducive to the gasification of water and does not damage the cable insulation, and is suitable for the temperature rise and dehumidification of the mine-used coal machine seven-core cable with a length of 1000 meters.

Description

Technical Field

[0001] The invention belongs to the technical field of mine cable dehumidification, and in particular relates to a mine seven-core cable automatic heating dehumidification and moisture absorption device. Background Art

[0002] The mining environment is complex and harsh, and safety is the most important requirement. The reliability and safety of the supporting equipment are very high, and the corresponding cables used in the equipment are also high. That is, the integrated cable for mining needs to have a series of functions such as flame retardancy, anti-collision, anti-crushing, and anti-stretching under the premise that one cable meets multiple functions. The seven-core cable for mining integrates wires and cables with different functions, making the wiring of mining equipment safer and more convenient. In the process of storage, transportation, laying and accessory production of the seven-core cable for mining, it is necessary to strengthen the moisture-proof work of the cable.

[0003] The reliability of the insulation performance of mining cables is an important prerequisite for ensuring safe power supply in mines. In the actual production process, affected by factors such as humid air underground and sweating of cables, the insulation resistance of coal mining machine rubber-sheathed cables and power cables is easily reduced due to moisture, thereby inducing electromechanical faults such as leakage and short circuit.

[0004] Before the damp cable forms a discharge, the fault phenomenon is relatively hidden and difficult to detect. It operates in a low insulation state for a long time, which can easily cause local overheating or large-area insulation aging and damage, which is difficult to repair. These greatly reduce its service life, and when dealing with similar faults, it often consumes huge manpower and material resources, which greatly affect the efficient and orderly production organization and increase production costs.

[0005] In the prior art, an AC current booster of an AC welding machine is used to heat and dehumidify the cable. However, the AC current booster is greatly affected by the inductive reactance and has a limited effective length (about 50 meters), so it is not suitable for mining cables. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a seven-core cable automatic heating, dehumidification and moisture absorption device for mining.

[0007] The present invention is implemented as follows: a seven-core cable automatic temperature rise dehumidification and moisture absorption device for mining, comprising a 10KV AC power supply, a 10KV current-increasing transformer, a converter, a 50V nine-pulse DC output device, a 2000V DC output device, and a sealed dehumidification and moisture absorption drying box, wherein the 10KV AC power supply is sequentially connected to the 10KV current-increasing transformer and the converter, and the converter is simultaneously connected to the 50V nine-pulse DC output device and the 2000V DC output device, and the 50V nine-pulse DC output device and the 2000V DC output device are both connected to the conductor core of the seven-core cable for mining,

[0008] The 10KV AC power source is taken from the AC grid.

[0009] The current-boosting transformer has five windings, two high-voltage and three low-voltage windings, 10KV / 50V / 500A, 10KV / 50V / 300A, 10KV / 50V / 100A, 10KV / 2000V,

[0010] The inverter converts AC power into DC power, wherein the three windings outputting 50V each have three phases, the seven-core cable is equipped with a nine-pulse rectifier, and two phases are unloaded.

[0011] The nine-pulse DC output device has seven phases connected to the seven-core conductors of the seven-core mining cable, two of which are unloaded.

[0012] The sealed dehumidification and moisture absorption drying box is a fully sealed control chamber, which is used to hold the seven-core mining cable that needs to be dehumidified.

[0013] The 50V nine-pulse DC output device includes a 50V / 500A three-phase adjustable DC power supply, a 50V / 300A three-phase adjustable DC power supply, and a 50V / 100A single-phase adjustable DC power supply. The 50V / 500A three-phase adjustable DC power supply, the 50V / 300A three-phase adjustable DC power supply, and the 50V / 100A single-phase adjustable DC power supply are respectively connected to a three-phase 500A DC contact module, a three-phase 300A DC contact module, and a single-phase 100A DC contact module. The 2000V DC output device includes a 2000V DC power supply, and the 2000V DC power supply is connected to a 7-way high-voltage controllable switch module. The three-phase 500A DC contact module, the three-phase 300A DC contact module, and the single-phase 100A DC contact module are connected to the conductor core of the seven-core mining cable, and the 7-way high-voltage controllable switch module is also connected to the conductor core of the seven-core mining cable.

[0014] The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module as well as the 7-way high-voltage controllable switch module are connected to the high-voltage switch and DC contactor control module at the same time. The insulation layer of the seven-core mining cable is connected to a 7-way micro-current transformer. The 7-way micro-current transformer is connected to the current acquisition module. The high-voltage switch and DC contactor control module and the current acquisition module are all connected to the main control computer.

[0015] Several dehumidification units are arranged on the seven-core cable of the coal mining machine, and the dehumidification units include a vacuum pump, a temperature and humidity sensor and a pressure sensor. The vacuum pump, the temperature and humidity sensor and the pressure sensor are all provided with a wireless transmission module, and the main control computer is also provided with a wireless transmission module. The wireless transmission module of the main control computer is wirelessly connected to the wireless transmission modules of the vacuum pump, the temperature and humidity sensor and the pressure sensor.

[0016] The sealed dehumidification and moisture absorption drying box is provided with several heating devices, and the sealed dehumidification and moisture absorption drying box is also provided with a temperature and humidity sensor, a pressure sensor and a vacuum pump. The heating device, vacuum pump, temperature and humidity sensor and pressure sensor of the sealed dehumidification and moisture absorption drying box are all provided with a wireless transmission module to be wirelessly connected to the main control computer.

[0017] A cable car is arranged in the sealed dehumidification and moisture absorption drying box. The cable car includes a cable car frame. A winding shaft and a winding motor are arranged on the cable car frame. The winding shaft rotates under the drive of the winding motor. The winding shaft is used to wind and place the seven-core cable of the coal machine for mining.

[0018] The bottom of the cable car is provided with a cable car rotating wheel, which is convenient for the cable car to move and transport the seven-core cable of the coal machine for mining to be dehumidified to the sealed dehumidification and moisture absorption drying box.

[0019] The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are arranged in a sealed dehumidification and moisture absorption drying box. The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are connected to the seven-core cable of the coal mining machine with a clamping ring, and the clamping ring is clamped on the seven-core cable of the coal mining machine.

[0020] The clamping ring comprises a clamping ring body and a locking portion. The clamping ring body is in a circular ring shape. The locking portion comprises a tongue portion and a fixing screw fixedly connected to the clamping ring body.

[0021] The sealed dehumidification and moisture absorption drying box is divided into two chambers, a positive pressure chamber and a negative pressure chamber, wherein the vacuum pump and the clamping ring are arranged on one side of the negative pressure chamber, and the cable car, temperature and humidity sensor, pressure sensor, and heating device are arranged on the positive pressure chamber side.

[0022] The beneficial effects of the present invention are as follows: the present invention has a reasonable structural design, (1) the seven-core cable for coal mining machine is connected to the three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module, according to the thermal effect of the current in the conductor: Q = I ２In the RT formula, I is the current passing through the conductor (A); R is the resistance of the conductor (Ω); T is the duration of the current (s). A large current is applied to the cable for short-circuit heating, and the moisture in the core is discharged by heat; (2) The 2000V DC power supply is connected to the 7-way high-voltage controllable switch module and then connected to the seven-core cable of the coal mining machine, and then the insulation resistance of the seven-core cable of the coal mining machine is detected by the 7-way micro-current transformer dehumidification unit and the current acquisition module; (3) The initial test value of the insulation resistance value of the rising current dehumidification, the DC resistance value is tested every 5 minutes (adjustable time) during the dehumidification process, and the DC resistance value reaches the qualified requirement. The heating and dehumidification are completed, and the report is printed through the main control computer; (4) The DC dehumidification voltage 50v and the DC resistance value test voltage 2000v are in the same circuit, and the DC heating dehumidification and DC resistance value initial value process value and standard value measurement are completed at the same time. The seven DC heating three-phase nine-pulsation large currents and the three insulation states meet the qualified standards under two DC voltages. The insulation resistance value is improved by automatic control The time taken for the whole process of DC heating and dehumidification; (5) DC heating is used to perform DC heating and dehumidification on the seven-core cable of the coal mining machine with a length of up to 1000 meters; (6) The sealed dehumidification and moisture absorption drying box is a fully sealed warehouse structure, which includes five contents: heating, dehumidification, moisture absorption, vacuum and drying, including a vacuum pump, a temperature and humidity sensor and a pressure sensor. The vacuum pump can take away the moisture discharged from the wire core, and at the same time, the temperature and humidity sensor can detect the moisture content in the discharged air, and the pressure sensor can detect the vacuum degree in the dehumidification unit; (7) The wireless transmission module of the main control computer is wirelessly connected to the wireless transmission modules of the vacuum pump, heating device, temperature and humidity sensor and pressure sensor to realize automatic control of temperature, humidity, vacuum and dryness in the drying cabin; (8) The clamping ring is clamped on the two terminal ends of the seven-core cable of the coal mining machine, locking one end of the cable, which is conducive to extracting moisture from the cable when vacuuming. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the connection structure of the 50V nine-pulse DC output device, the 2000V DC output device and the seven-core cable of the coal machine for mining;

[0025] Figure 3 It is a schematic diagram of the dehumidification and moisture absorption principle of the 50V nine-pulse DC output device of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the sealed dehumidification and moisture absorption drying box of the present invention;

[0027] Figure 5 It is a schematic diagram of the clamping ring structure of the present invention.

[0028] In the figure: 1-sealed dehumidification and moisture absorption drying box, 2-cable car, 201-cable car frame, 202-winding shaft, 203-winding motor, 204-cable car wheel, 3-DC power supply device, 4-dehumidification unit, 5-vacuum pump, 6-temperature and humidity sensor, 7-pressure sensor, 8-wireless transmission module, 9-clamp, 901-clamp body, 902-locking part, 9021-tongue, 9022-fixing screw, 10-heating device. DETAILED DESCRIPTION

[0029] In order to more clearly understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0030] A seven-core cable automatic heating and dehumidification device for mining Figure 1 The device shown includes a 10KV AC power supply, a 10KV current-boosting transformer, a converter, a 50V nine-pulse DC output device, a 2000V DC output device, and a sealed dehumidification and moisture-absorbing drying box 1. The 10KV AC power supply is connected to the 10KV current-boosting transformer and the converter in sequence. The converter is simultaneously connected to the 50V nine-pulse DC output device and the 2000V DC output device. The 50V nine-pulse DC output device and the 2000V DC output device are both connected to the conductor core of the seven-core mining cable.

[0031] The 10KV AC power source is taken from the AC grid.

[0032] The current-boosting transformer has five windings, two high-voltage windings and three low-voltage windings, 10KV / 50V / 500A, 10KV / 50V / 300A, 10KV / 50V / 100A, 10KV / 2000V, of which 10KV and 2000V are high-voltage windings and 50V is low-voltage winding, realizing the conversion from 10KV to 50V and 2000V.

[0033] The inverter converts AC power into DC power, wherein the three windings outputting 50V each have three phases, the seven-core cable is equipped with a nine-pulse rectifier, and two phases are unloaded.

[0034] The nine-pulse DC output device has seven phases connected to the seven-core wires of the seven-core mining cable, two of which are unloaded. The two unloaded phases need to be equipped with corresponding resistors.

[0035] The sealed dehumidification and moisture absorption drying box 1 is a fully sealed control chamber. Figure 4 As shown, it is used to hold seven-core mining cables that need to be dehumidified.

[0036] like Figure 2As shown, the 50V nine-pulse DC output device includes a 50V / 500A three-phase adjustable DC power supply, a 50V / 300A three-phase adjustable DC power supply, and a 50V / 100A single-phase adjustable DC power supply. The 50V / 500A three-phase adjustable DC power supply, the 50V / 300A three-phase adjustable DC power supply, and the 50V / 100A single-phase adjustable DC power supply are respectively connected to a three-phase 500A DC contact module, a three-phase 300A DC contact module, and a single-phase 100A DC contact module. The 2000V DC output device includes a 2000V DC power supply, and the 2000V DC power supply is connected to a 7-way high-voltage controllable switch module. The three-phase 500A DC contact module, the three-phase 300A DC contact module, and the single-phase 100A DC contact module are connected to the conductor core of the seven-core mining cable, and the 7-way high-voltage controllable switch module is also connected to the conductor core of the seven-core mining cable.

[0037] The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module as well as the 7-way high-voltage controllable switch module are connected to the high-voltage switch and DC contactor control module at the same time. The insulation layer of the seven-core mining cable is connected to a 7-way micro-current transformer. The 7-way micro-current transformer is connected to the current acquisition module. The high-voltage switch and DC contactor control module and the current acquisition module are all connected to the main control computer.

[0038] like Figure 3 As shown, a number of dehumidification units 4 are arranged on the seven-core cable of the coal mining machine, and the dehumidification units include a vacuum pump 5, a temperature and humidity sensor 6 and a pressure sensor 7. The vacuum pump 5, the temperature and humidity sensor 6 and the pressure sensor 7 are all provided with a wireless transmission module 8, and the main control computer is also provided with a wireless transmission module. The wireless transmission module of the main control computer is wirelessly connected to the wireless transmission module 8 of the vacuum pump 5, the temperature and humidity sensor 6 and the pressure sensor 7.

[0039] like Figure 4 As shown, the sealed dehumidification and moisture absorption drying box 1 is provided with a plurality of heating devices 10, and the sealed dehumidification and moisture absorption drying box is also provided with a temperature and humidity sensor 6, a pressure sensor 7 and a vacuum pump 5. The heating device 10, the vacuum pump 56, the temperature and humidity sensor 6 and the pressure sensor 7 of the sealed dehumidification and moisture absorption drying box 1 are all provided with a wireless transmission module 8 to wirelessly connect to the main control computer. The wireless module can be implemented using a 2.4G Zigbe wireless transmission network.

[0040] A cable car 2 is arranged in the sealed dehumidification and moisture absorption drying box 1. The cable car 2 includes a cable car frame 201. A winding shaft 202 and a winding motor 203 are arranged on the cable car frame 201. The winding shaft 202 rotates under the drive of the winding motor 203. The winding shaft 202 is used to wind and place the seven-core cable of the coal machine for mining.

[0041] A cable car rotating wheel 204 is arranged at the bottom of the cable car 2, so as to facilitate the movement of the cable car 1 to transfer the seven-core cable of the coal machine for mining to be dehumidified to the sealed dehumidification and moisture absorption drying box.

[0042] The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are arranged in a sealed dehumidification and moisture absorption drying box. The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are connected to the seven-core cable of the coal mining machine with a clamping ring 5, and the clamping ring 9 is clamped on the seven-core cable of the coal mining machine.

[0043] The clamping ring 9 includes a clamping ring body 901 and a locking portion. The clamping ring body 901 is in a circular ring shape. The locking portion 902 includes a tongue portion 9021 fixedly connected to the clamping ring body and a fixing screw 9022.

[0044] The sealed dehumidification and moisture absorption drying box 1 is divided into two chambers, a positive pressure chamber and a negative pressure chamber, wherein the vacuum pump 5 and the clamping ring 9 are arranged on the negative pressure chamber side, and the cable car 2, the temperature and humidity sensor 6, the pressure sensor 7, and the heating device 10 are arranged on the positive pressure chamber side.

[0045] The invention converts AC into DC through a high-power rectifier and inputs it into the conductor of the cable to be dehumidified. Under the action of the DC current, the conductor is heated to achieve a warming effect. The temperature is reasonably controlled to facilitate the gasification of moisture without damaging the cable insulation. It is suitable for heating and dehumidifying a 1,000-meter-long seven-core cable for a coal machine used in a mine.

[0046] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A seven-core cable automatic heating and dehumidification device for mining, characterized in that: It includes a 10KV AC power supply, a 10KV current-boosting transformer, a converter, a 50V nine-pulse DC output device, a 2000V DC output device, and a sealed dehumidification and moisture-absorbing drying box. The 10KV AC power supply is connected to the 10KV current-boosting transformer and the converter in sequence. The converter is simultaneously connected to the 50V nine-pulse DC output device and the 2000V DC output device. The 50V nine-pulse DC output device and the 2000V DC output device are both connected to the conductor core of the seven-core mining cable. The 10KV AC power supply is taken from the AC power grid. The current-boosting transformer has five windings, two high-voltage and three low-voltage windings, 10KV / 50V / 500A, 10KV / 50V / 300A, 10KV / 50V / 100A, 10KV / 2000V, The inverter converts AC power into DC power, wherein the three windings outputting 50V each have three phases, the seven-core cable is equipped with a nine-pulse rectifier, and two phases are unloaded. The nine-pulse DC output device has seven phases connected to the seven-core conductors of the seven-core mining cable, two of which are unloaded. The sealed dehumidification and moisture absorption drying box is a fully sealed control chamber for holding the seven-core mining cable that needs to be dehumidified. The 50V nine-pulse DC output device includes a 50V / 500A three-phase adjustable DC power supply, a 50V / 300A three-phase adjustable DC power supply, and a 50V / 100A single-phase adjustable DC power supply. The 50V / 500A three-phase adjustable DC power supply, the 50V / 300A three-phase adjustable DC power supply, and the 50V / 100A single-phase adjustable DC power supply are connected to the three-phase 5 00A DC contact module, three-phase 300A DC contact module and single-phase 100A DC contact module, the 2000V DC output device includes a 2000V DC power supply, the 2000V DC power supply is connected to a 7-way high-voltage controllable switch module, the three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are connected to the conductor core of the seven-core cable for mining, and the 7-way high-voltage controllable switch module is also connected to the conductor core of the seven-core cable for mining, The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module and the 7-way high-voltage controllable switch module are connected to the high-voltage switch and DC contactor control module at the same time. The insulation layer of the seven-core mining cable is connected to a 7-way micro-current transformer. The 7-way micro-current transformer is connected to the current acquisition module. The high-voltage switch and DC contactor control module and the current acquisition module are all connected to the main control computer. The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are arranged in a sealed dehumidification and moisture absorption drying box. The three-phase 500A DC contact module, the three-phase 300A DC contact module and the single-phase 100A DC contact module are connected to the seven-core cable of the coal mining machine with a clamping ring, and the clamping ring is clamped on the seven-core cable of the coal mining machine.

2. The automatic temperature rise, dehumidification and moisture absorption device for seven-core cables for mining according to claim 1 is characterized in that: Several dehumidification units are arranged on the seven-core cable of the coal mining machine, and the dehumidification units include a vacuum pump, a temperature and humidity sensor and a pressure sensor. The vacuum pump, the temperature and humidity sensor and the pressure sensor are all provided with a wireless transmission module, and the main control computer is also provided with a wireless transmission module. The wireless transmission module of the main control computer is wirelessly connected to the wireless transmission modules of the vacuum pump, the temperature and humidity sensor and the pressure sensor.

3. The automatic temperature rise, dehumidification and moisture absorption device for a seven-core cable for mining use according to claim 1 is characterized in that: The sealed dehumidification and moisture absorption drying box is provided with several heating devices, and the sealed dehumidification and moisture absorption drying box is also provided with a temperature and humidity sensor, a pressure sensor and a vacuum pump. The heating device, vacuum pump, temperature and humidity sensor and pressure sensor of the sealed dehumidification and moisture absorption drying box are all provided with a wireless transmission module to be wirelessly connected to the main control computer.

4. The automatic temperature rise, dehumidification and moisture absorption device for seven-core cables for mining use according to claim 3 is characterized in that: A cable car is arranged in the sealed dehumidification and moisture absorption drying box. The cable car includes a cable car frame. A winding shaft and a winding motor are arranged on the cable car frame. The winding shaft rotates under the drive of the winding motor. The winding shaft is used to wind and place the seven-core cable of the coal machine for mining.

5. The automatic temperature rise, dehumidification and moisture absorption device for seven-core cables for mining according to claim 4 is characterized in that: A cable car rotating wheel is arranged at the bottom of the cable car.

6. According to claim 4, a seven-core cable automatic temperature rise dehumidification and moisture absorption device for mining, characterized in that: The clamping ring comprises a clamping ring body and a locking portion. The clamping ring body is in a circular ring shape. The locking portion comprises a tongue portion and a fixing screw fixedly connected to the clamping ring body.

7. The automatic temperature rise, dehumidification and moisture absorption device for seven-core cables for mining according to claim 6 is characterized in that: The sealed dehumidification and moisture absorption drying box is divided into two chambers, a positive pressure chamber and a negative pressure chamber, wherein the vacuum pump and the clamping ring are arranged on one side of the negative pressure chamber, and the cable car, temperature and humidity sensor, pressure sensor, and heating device are arranged on the positive pressure chamber side.

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