Device for limiting continuous rise of bus voltage of electric drilling machine

Abstract

The utility model discloses a device for limiting continuous rise of bus voltage of an electric drive drilling machine, which relates to the technical field of horizontal directional drilling machines and comprises a power head device, a power head control device and a power supply assembly, and the power head device comprises a power head motor, a power head motor controller and a power supply assembly. The AC power supply is connected with the power head motor controller through the rectifier and the DC bus; the energy consumption load is connected with the direct-current bus and is used for operating when the power head motor brakes so as to stabilize the voltage on the direct-current bus; according to the utility model, electric energy generated during braking of the power head motor is consumed through the energy-consuming load, so that the voltage of the direct-current bus is maintained in a stable interval, and the normal operation of the drilling machine is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of horizontal directional drilling machines, in particular to a device for limiting the continuous rise of bus voltage of an electric-driven drilling machine. Background Art

[0002] Horizontal directional drilling rigs have gradually become one of the main equipment for trenchless construction, accounting for more than 85% of the market share. They are widely used in the laying and construction of underground water supply, sewage, oil and gas, communications, power supply and other pipelines.

[0003] At present, the electric-driven trenchless horizontal directional drilling rig uses electric drive for the rotation and forward and backward movement of the drill rod. The fuel cost of construction is greatly reduced, the noise is low, and it is easy to maintain. It is increasingly favored by users and the market demand is increasing day by day. However, large electric-driven drilling rigs need to decelerate frequently during construction, and the motor will be in the power generation state, causing the bus voltage to overvoltage and shut down. At this time, the drilling rig will be out of control, which is very dangerous and absolutely not allowed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the disadvantages of the prior art and provide a device for limiting the continuous rise of bus voltage of an electric-driven drilling rig.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A device for limiting the continuous rise of bus voltage on an electric-driven drilling rig, comprising:

[0007] The power head device includes a power head motor, a power head motor controller and a power supply component, wherein the power supply component includes an AC power supply, and the AC power supply is connected to the power head motor controller through a rectifier and a DC bus;

[0008] Energy-consuming load, connected to the DC bus, used to operate when the power head motor is braked to stabilize the voltage on the DC bus.

[0009] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric drill rig of the utility model, the energy-consuming load includes a first energy-consuming unit, the first energy-consuming unit includes an energy storage buffer connected to the DC bus, and the energy storage buffer includes at least one capacitor.

[0010] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric drill rig of the utility model, the energy-consuming load also includes a second energy-consuming unit, and the second energy-consuming unit includes a second controller connected to the DC bus, an auxiliary motor connected to the second controller, a hydraulic pump connected to the auxiliary motor, an overflow valve connected to the hydraulic pump, and a radiator connected to the overflow valve.

[0011] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric drill rig of the utility model, the energy-consuming load also includes a third energy-consuming unit, and the third energy-consuming unit includes at least one braking unit connected to the DC bus and a braking resistor connected to the braking unit.

[0012] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric-driven drilling rig of the utility model, when the voltage on the DC bus is higher than the starting voltage of the braking unit, the braking resistor operates.

[0013] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric-driven drilling rig of the utility model, the auxiliary motor is a permanent magnet synchronous motor.

[0014] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric-driven drilling rig of the utility model, the hydraulic pump is a load-sensitive pump.

[0015] As a preferred solution of the device for limiting the continuous rise of bus voltage of the electric-driven drilling rig of the utility model, a circuit breaker is further connected between the AC power supply and the rectifier.

[0016] The beneficial effects of the utility model are:

[0017] (1) The utility model consumes the electric energy generated when the motor of the power head is braked by means of an energy-consuming load, so that the voltage of the DC bus is maintained in a stable range, thereby ensuring the normal operation of the drilling rig.

[0018] (2) The energy-consuming load in the utility model includes a first energy-consuming unit, a second energy-consuming unit and a third energy-consuming unit. The first energy-consuming unit can store energy by means of a capacitor to eliminate peak loads. The second energy-consuming unit can overflow at high power to convert part of the electric energy into the internal energy of the hydraulic oil and dissipate it into the air through a radiator. The third energy-consuming unit releases the braking electric energy generated by the motor of the power head into the air in the form of heat energy to maintain the voltage stability of the DC bus, thereby avoiding the situation in which the bus voltage is over-voltage and the enable is shut down, thereby causing the drilling rig to lose control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the system framework of a device for limiting the continuous rise of bus voltage on an electric-driven drilling rig provided by the utility model;

[0021] Among them: 1. AC power supply; 2. Circuit breaker; 3. Rectifier; 4. DC bus; 5. Third energy consumption unit; 6. First energy consumption unit; 7. Capacitor; 8. Second energy consumption unit; 9. Radiator; 10. Overflow valve; 11. Hydraulic pump; 12. Auxiliary motor; 13. Second controller; 14. Braking resistor; 15. Braking unit; 16. Power head motor; 17. Power head motor controller. DETAILED DESCRIPTION

[0022] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below according to specific implementation methods and in combination with the accompanying drawings.

[0023] Figure 1 A schematic diagram of the system framework of a device for limiting the continuous rise of bus voltage provided in an electric drill according to an embodiment of the present application. The device includes a power head device and an energy-consuming load. When the power head device is braked, it is in a power generation state, and at this time, the energy-consuming load consumes energy to maintain the voltage stability of the DC bus 4.

[0024] Specifically, the power head device includes a power head motor 16, a power head motor controller 17 and a power supply component. The power supply component includes an AC power source 1, a circuit breaker 2, a rectifier 3 and a DC bus 4. The AC power source 1 is connected to the circuit breaker 2. The circuit breaker 2 is connected to the rectifier 3. The rectifier 3 is connected to the power head motor controller 17 through the DC bus 4. The power head motor 16 is connected to the power head motor controller 17.

[0025] The AC power source 1 is rectified into DC power by the rectifier 3 through the circuit breaker 2 to the DC bus 4. Under normal circumstances, the DC power is inverted into AC power by the power head motor controller 17 to maintain the normal operation of the power head motor 16.

[0026] The energy consumption load includes a first energy consumption unit 6, a second energy consumption unit 8 and a third energy consumption unit 5. The first energy consumption unit 6 includes an energy storage buffer. The energy storage buffer is connected to the DC bus 4. The energy storage buffer is composed of a single or multiple capacitors 7.

[0027] The second energy consumption unit 8 includes a second controller 13, an auxiliary motor 12, a hydraulic pump 11, a relief valve 10 and a radiator 9. The second controller 13 is connected to the DC bus 4. The auxiliary motor 12 is connected to the second controller 13. The hydraulic pump 11 is connected to the auxiliary motor 12. The hydraulic valve is connected to the hydraulic pump 11. The radiator 9 is connected to the relief valve 10.

[0028] In this embodiment, the auxiliary motor 12 is a permanent magnet synchronous motor, and the hydraulic pump 11 is a load sensitive pump.

[0029] The third energy consumption unit 5 includes a braking unit 15 and a braking resistor 14. The braking unit 15 is connected to the DC bus 4, and the braking resistor 14 is connected to the braking unit 15. The braking unit 15 and the braking resistor 14 are provided in one or more groups.

[0030] When the power head motor 16 brakes, it is in a power generation state. The generated AC power is converted into DC power by the power head motor controller 17 and fed into the DC bus 4, so that the voltage of the DC bus 4 increases. At this time, the capacitor 7 in the energy storage buffer instantly performs peak energy storage. At the same time, the overflow valve 10 in the second energy consumption unit 8 is put into operation to perform high-power overflow, converting part of the electrical energy into the internal energy of the hydraulic oil, and dissipating it into the air through the radiator 9. When the voltage on the DC bus 4 continues to increase to reach the starting voltage of the brake unit 15, the brake resistor 14 is put into operation to release the electrical energy of the power head motor 16 into the air in the form of heat energy to maintain the voltage stability of the DC bus 4.

[0031] Therefore, the technical solution of the present application consumes the electric energy generated when the power head motor 16 is braked through the energy-consuming load, so that the voltage of the DC bus 4 is maintained in a stable range, thereby ensuring the normal operation of the drilling rig.

[0032] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A device for limiting the continuous rise of bus voltage in an electric drill, characterized in that: include: A power head device comprises a power head motor (16), a power head motor controller (17) and a power supply assembly, wherein the power supply assembly comprises an AC power source (1), and the AC power source (1) is connected to the power head motor controller (17) via a rectifier (3) and a DC bus (4); An energy-consuming load is connected to the DC bus (4) and is used to operate when the power head motor (16) is braked to stabilize the voltage on the DC bus (4).

2. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 1, characterized in that: The energy-consuming load comprises a first energy-consuming unit (6), wherein the first energy-consuming unit (6) comprises an energy storage buffer connected to the DC bus (4), and the energy storage buffer comprises at least one capacitor (7).

3. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 2, characterized in that: The energy-consuming load further comprises a second energy-consuming unit (8), wherein the second energy-consuming unit (8) comprises a second controller (13) connected to the DC bus (4), an auxiliary motor (12) connected to the second controller (13), a hydraulic pump (11) connected to the auxiliary motor (12), a relief valve (10) connected to the hydraulic pump (11), and a radiator (9) connected to the relief valve (10).

4. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 3, characterized in that: The energy-consuming load further comprises a third energy-consuming unit (5), wherein the third energy-consuming unit (5) comprises at least one braking unit (15) connected to the DC bus (4) and a braking resistor (14) connected to the braking unit (15).

5. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 4, characterized in that: When the voltage on the DC bus (4) is higher than the starting voltage of the braking unit (15), the braking resistor (14) operates.

6. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 3, characterized in that: The auxiliary motor (12) is a permanent magnet synchronous motor.

7. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 3, characterized in that: The hydraulic pump (11) is a load-sensitive pump.

8. The device for limiting the continuous rise of bus voltage of an electric drill according to claim 1, characterized in that: A circuit breaker (2) is also connected between the AC power source (1) and the rectifier (3).

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