A kind of standby power assembly based on mine hoist head sheave

Abstract

The application belongs to the technical field of mine hoist transmission, and specifically provides a standby power assembly based on a sheave of a mine hoist, which mainly comprises a speed regulating device, a motor, a photoelectric encoder, a clutch and a sheave. The sheave is of high strength, and the steel wire rope liner is preferably made of a material with high friction coefficient. The friction coefficient and the strength of the sheave can meet the requirements of the load carried in the standby and emergency lifting process under the traction force generated by the lifting steel wire rope. In the case of need, the clutch is attracted, and under the action of the speed regulating device, the alternating current motor rotates at a speed corresponding to 0~f e (rated frequency), and the direct current motor rotates at a speed corresponding to 0~U e (rated voltage). The sheave is driven to rotate by the clutch, and the lifting steel wire rope is driven to rotate by the high-friction liner nested in the sheave pulley, so as to complete the standby or emergency lifting task. Under normal circumstances, the clutch is separated, and the standby power assembly is in standby state.

Description

Technical Field

[0001] This invention belongs to the field of mine hoist transmission technology, and specifically proposes a backup power assembly based on the head sheave of a mine hoist. Background Technology

[0002] Head sheaves are used in single-rope winding hoists and ground-mounted multi-rope friction hoists. The main structures of traditional head sheaves include: spoked cast iron head sheaves, welded head sheaves, integral cast steel head sheaves, floating head sheaves for inclined shafts, and multi-rope head sheaves (one of which is a fixed sheave and the others are floating sheaves). The floating head sheaves can rotate relative to the head sheave main shaft to eliminate the sliding wear of the head sheave rope groove caused by the speed deviation of the hoisting wire rope.

[0003] Traditional hoist sheaves typically consist of a main shaft, hub, rope pulley, wire rope pad, spokes, and base. They only serve as guides for the hoisting wire rope and are driven wheels of the mine hoist, without transmission power; they are not driving wheels.

[0004] The invention patent with application number 201810695601.7 discloses "An emergency evacuation method for underground personnel based on a mine hoist braking system"; the invention patent with patent number ZL 2021 1 0258033.6 discloses "An emergency hoisting drive system for mines"; the utility model patent with patent number ZL 2022 2 2550573.4 discloses "An emergency operation device for a low-speed direct-drive auxiliary shaft hoist"; the utility model patent with patent number ZL 2022 2 2550660.X discloses "An emergency operation device for a high-speed deceleration auxiliary shaft hoist"; and the utility model patent with patent number ZL 2022 2 The utility model patent 2550658.2 discloses "An Emergency Operation Device for an Internal Auxiliary Shaft Hoist"; etc. The emergency hoisting methods or systems (devices) disclosed in the above patents are all based on the mine hoist main unit and electrical control equipment itself, which has certain limitations. If the key components of the mine hoist main unit, including the electrical control equipment, suffer serious failures, the above traditional methods or systems (devices) cannot complete the backup or emergency hoisting tasks.

[0005] The "Coal Mine Safety Regulations" (2022 edition) mentions "backup" in dozens of clauses, covering "backup power supply, backup communication, backup signal, backup fan, backup water pump, etc."; Article 423 of the "Coal Mine Safety Regulations" also proposes a "dual-line system." Inspired by this, in order to ensure the safe production of underground mines, this invention proposes that the power source of mine hoists should also be "backup" or implement a "dual-line system" to meet the needs of backup or emergency hoisting.

[0006] The sheave is located far from the main body of the mine hoist and is installed on the hoist's headframe, relatively independent of the main body. If the traditional sheave is transformed from a driven sheave into a powered drive sheave, thus achieving a "dual-line system" or "backup equipment" for the power source of the mine hoist, it would undoubtedly be a good technical solution. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention proposes a backup power assembly based on the head sheave of a mine hoist.

[0008] To achieve its objective, the present invention adopts the following technical solution:

[0009] A backup power assembly based on a mine hoist sheave includes a speed regulating device, a motor, a photoelectric encoder, a clutch, and a sheave. The motor is either a low-speed motor or a high-speed motor with a reducer. The sheave serves as the driving wheel within the backup power assembly, specifically: the driven end of the clutch is mounted on the output shaft of the sheave's main shaft, and the driving end is mounted on the low-speed shaft of the reducer. The high-speed shaft of the reducer is connected to the load-side output shaft of the high-speed motor via a coupling. The reducer can be integrated into the high-speed motor, forming a high-speed semi-direct-drive connection; alternatively, the driving end of the clutch is directly mounted on the load-side output shaft of the low-speed motor, forming a low-speed direct-drive connection. The photoelectric encoder is mounted on the motor and driven by its non-load-side output shaft. Under normal conditions, the sheave only guides the hoisting wire rope and remains a driven wheel. Once the mine hoist's regular driving power source becomes unavailable, the backup power assembly is activated, and the sheave becomes the driving wheel for backup or emergency hoisting until the task is completed.

[0010] The motor is an AC motor, and the speed control device is a variable frequency speed control device; the three phases of the input side of the variable frequency speed control device are connected to the main power supply device, and its output is connected to the stator winding of the AC motor, providing 0~f power to the stator winding. e Variable frequency power supply, f e The rated frequency of the AC motor is specified; the photoelectric encoder is connected to the speed feedback interface in the frequency converter speed control device, providing the frequency converter speed control device with the angle or position of the AC motor rotor and forming a speed closed-loop control.

[0011] The AC motor is an AC asynchronous motor or an AC synchronous motor. The AC synchronous motor is of permanent magnet type or separately excited type. The type of drive motor set in the selected frequency converter speed control device or its application software must match the type of the AC motor.

[0012] The motor is a DC motor, and the speed control device consists of a three-phase DC speed controller and an excitation device. The three phases of the input side of the three-phase DC speed controller are connected to the main power supply device, and its output is connected to the armature winding of the DC motor, providing 0~U to the armature winding. e Adjustable voltage power supply, U e The rated voltage of the DC motor is specified; the photoelectric encoder is connected to the speed feedback interface of the three-phase DC speed controller to provide the DC motor speed to the three-phase DC speed controller and form a speed closed-loop control; the three-phase or single-phase input side of the excitation device is connected to the auxiliary power supply device, and its output is connected to the excitation winding of the DC motor to provide the excitation current to the excitation winding.

[0013] The excitation device is a small three-phase DC speed controller, or a single-phase excitation rectifier built into the three-phase DC speed controller that supplies power to the armature winding.

[0014] The armature winding of one of the DC motors can be powered by one of the three-phase DC speed controllers, with a DC output of 6 pulses; alternatively, it can be powered by two three-phase DC speed controllers of the same specifications, forming a series 12 or parallel 12 pulse configuration. The series or parallel configuration involves connecting the output sides of two three-phase DC speed controllers in series or parallel to provide 0~U pulses to the armature winding. e The adjustable voltage power supply, consisting of two three-phase DC speed controllers forming a 12-pulse system, exchanges data via communication. One of the three-phase DC speed controllers acts as the master, and the other as the slave, achieving master-slave control. When the excitation device is selected as a small three-phase DC speed controller, it exchanges data with the two three-phase DC speed controllers forming the 12-pulse system via communication. The preferred scheme is that the excitation device acts as the master, and all three-phase DC speed controllers forming the 12-pulse system are slaves, achieving one master and multiple slave control. The master has a speed loop and a current loop, while the slave only has a current loop. The photoelectric encoder is only connected to the speed feedback interface of the three-phase DC speed controller acting as the master.

[0015] The clutch can be an electromagnetic clutch, a hydraulic clutch, or a pneumatic clutch, with an electromagnetic clutch being preferred. By de-energizing and energizing the electromagnet in the clutch, it is easy to control the disengagement or engagement of the clutch. However, if a suitable hydraulic source is available, a hydraulic clutch is preferred; if a suitable pneumatic source is available, a pneumatic clutch is preferred.

[0016] The sheave can be driven by a single set of devices (single machine) or by two sets of devices with the same configuration (dual machine); when driven by dual machines, several speed regulating devices are controlled by master and slave, with one set as the master and the rest as slaves.

[0017] The entire structure of the sheave, including the main shaft, hub, sheave, and other components such as bearings and base, is made of high-strength material. The wire rope liner is preferably made of a high-friction coefficient material. This friction coefficient, combined with the traction force generated by the lifting wire rope and the strength of the sheave, can meet the load requirements during standby and emergency lifting. In addition, anti-slip calculations should be performed with reference to friction hoists when necessary.

[0018] This invention proposes a backup power assembly based on a mine hoist sheave. The sheave's overall components, including the main shaft, hub, bearings, and foundation, are all constructed with high strength and possess the characteristics of a drive wheel. The wire rope liner is preferably made of a high-friction coefficient material. This friction coefficient, combined with the traction force generated by the hoisting wire rope and the strength of the sheave, can meet the load requirements during backup and emergency hoisting. In the event of backup or emergency hoisting, the clutch is engaged, and under the action of the speed regulating device, the AC motor operates at 0~f... e (Rated frequency), DC motor with 0~U e The system operates at the speed corresponding to the rated voltage, and drives the sheave to rotate through the clutch. The sheave drives the hoisting wire rope to rotate through the high-friction pads nested in the rope wheel, completing the standby or emergency hoisting task. Under normal circumstances, the clutch is disengaged, the sheave rotates with the hoist drum, and only serves as a guide for the hoisting wire rope. The standby power assembly is in standby mode. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the AC backup power assembly (single-machine drive) in this invention.

[0020] Figure 2 This is a schematic diagram of the AC backup power system (dual-machine drive) in this invention.

[0021] Figure 3 This is a schematic diagram of the DC backup power assembly in this invention (6 pulses).

[0022] Figure 4 This is a schematic diagram of the DC backup power assembly in this invention (12 pulses in series).

[0023] Figure 5 This is a schematic diagram of the DC backup power assembly in this invention (low-speed direct drive, parallel 12-pulse).

[0024] In the diagram: 1a and 1b, variable frequency speed control device; 2.1a and 2.1b, AC motor; 2.2a and 2.2b, reducer; 2.3a and 2.3b, photoelectric encoder; 3a and 3b, clutch; 4, sheave (including 4.0, hub; 4.1, main shaft; 4.2, rope pulley; 4.3, wire rope pad, etc.); 5, hoisting wire rope; 6.1 and 6.2, three-phase DC speed controller; 6.3, excitation device; 7.1, DC motor; 7.1a, DC motor excitation winding; A1 and A2, main power supply device; B, auxiliary power supply device. Detailed Implementation

[0025] The embodiments of the present invention will be described in conjunction with the accompanying drawings and specific examples:

[0026] Combination Figure 1 and Figure 2 An AC backup power assembly based on a mine hoist sheave mainly consists of a variable frequency speed control device 1a, an AC motor 2.1a, a reducer 2.2a, a photoelectric encoder 2.3a, a clutch 3a, and a sheave 4. The driven end of the clutch 3a is mounted on the output shaft of the sheave main shaft 4.1, and the driving end is mounted on the low-speed shaft of the reducer 2.2a. The high-speed shaft of the reducer 2.2a is connected to the load-side output shaft of the AC motor 2.1a via a coupling. The photoelectric encoder 2.3a is mounted on the AC motor and driven by its non-load-side output shaft.

[0027] The three-phase input of the frequency converter speed control device 1a is connected to the main power supply device A1, and its output is connected to the stator winding of the AC motor 2.1a, providing 0~f power to the stator winding. e Variable frequency power supply, f e The rated frequency of the AC motor 2.1a is specified; the photoelectric encoder 2.3a is connected to the speed feedback interface in the frequency converter speed control device 1a, providing the frequency converter speed control device 1a with the angle (position) of the rotor of the AC motor 2.1a and forming a speed closed-loop control.

[0028] by Figure 1For example, the AC motor 2.1a can be an AC asynchronous motor or an AC synchronous motor. The AC synchronous motor can be a permanent magnet type or a separately excited type. The type of drive motor set in the selected frequency converter speed control device 1a or its application software must match the type of the AC motor 2.1a. The frequency converter speed control device 1a is a general-purpose frequency converter, and its basic configuration is to drive the AC asynchronous motor. If the AC motor 2.1a is an AC synchronous motor, then the selected frequency converter speed control device 1a should have the function of driving the AC synchronous motor, and the motor type should be set in the application software of the frequency converter speed control device 1a as: motor type = AC synchronous motor. If the application software allows, further settings are required: permanent magnet type or separately excited type.

[0029] The sheave wheel 4 can be driven by a set of devices (single machines), such as... Figure 1 As shown, it can also be driven by two sets of devices with the same configuration (dual machines), such as... Figure 2 As shown, the equipment includes AC motors 2.1a and 2.1b, frequency converter speed control devices 1a and 1b, reducers 2.2a and 2.2b, photoelectric encoders 2.3a and 2.3b, clutches 3a and 3b, etc. When the two sets of equipment are driven, the main shaft of the sheave 4 is required to be a double-ended output shaft. The two sets of frequency converter speed control devices 1a and 1b are master-slave control, which can be set through the application software in the frequency converter speed control device: one of them (such as 1a) is the master and the other (such as 1b) is the slave.

[0030] See details Figure 1 and Figure 2 As shown in the dashed box, the reducers 2.2a and 2.2b can be integrated into the AC motors 2.1a and 2.1b respectively, forming a semi-direct drive connection. The semi-direct drive connection means that the reducers, such as 2.2a and 2.2b, are not visible externally. The sheave is driven by the AC motors 2.1a and 2.1b via a clutch, which is significantly different from the low-speed direct drive connection where the reducers are eliminated. However, compared to the separate packaging of the AC motor and reducers, the semi-direct drive connection has a smaller footprint and lower cost compared to the so-called low-speed direct drive or low-speed direct connection types; therefore, the semi-direct drive type is more suitable for the application scenarios described in this invention.

[0031] Combination Figure 3A DC backup power assembly based on a mine hoist sheave mainly consists of a three-phase DC speed controller 6.1, an excitation device 6.3, a DC motor 7.1, a reducer 2.2a, a photoelectric encoder 2.3a, a clutch 3a, and a sheave 4. The driven end of the clutch 3a is mounted on the output shaft of the sheave main shaft 4.1, and the driving end is mounted on the low-speed shaft of the reducer 2.2a. The high-speed shaft of the reducer 2.2a is connected to the load-side output shaft of the DC motor 7.1 via a coupling. The photoelectric encoder 2.3a is mounted on the DC motor 7.1 and is driven by its non-load-side output shaft.

[0032] Figure 3 In this circuit, the three phases of the input side of the three-phase DC speed controller 6.1 are connected to the main power supply device A1, and its output is connected to the armature winding of the DC motor 7.1, providing 0~U to the armature winding. e Adjustable voltage power supply, U e The rated voltage of the DC motor 7.1 is provided; the photoelectric encoder 2.3a is connected to the speed feedback interface of the three-phase DC speed controller 6.1 to provide the speed of the DC motor 7.1 to the three-phase DC speed controller 6.1 and form a speed closed-loop control.

[0033] Figure 3 In this configuration, the three-phase or single-phase input side of the excitation device 6.3 is connected to the auxiliary power supply device B, and its output is connected to the excitation winding 7.1a of the DC motor 7.1, providing excitation current to the excitation winding 7.1a. The excitation device 6.3 can be selected as a small three-phase DC speed controller, or it can be built into the three-phase DC speed controller 6.1 that supplies power to the armature winding. In the case of being built into the motor, the excitation device is a single-phase rectifier. Compared to single-phase rectification, the miniature DC speed controller is a three-phase rectifier, which has higher DC output quality and lower harmonic components, but the cost is slightly higher. The excitation device 6.3 is built into the three-phase DC speed controller 6.1, which means that the excitation device 6.3 and the three-phase DC speed controller are a single speed controller, which has a lower cost. If the excitation device 6.3 can be selected as a miniature three-phase DC speed controller, in addition to the three-phase DC speed controller, one more miniature three-phase DC speed controller is needed, and the additional cost is the cost of the miniature three-phase DC speed controller.

[0034] The DC motor 7.1 may be a high-speed DC motor, such as... Figure 3 and Figure 4 As shown, it may be a low-speed DC motor, such as... Figure 5 As shown. For the low-speed DC motor, the reducer is removed, thus forming a so-called low-speed direct drive connection type: the driven end of the clutch 3 is mounted on the output shaft of the sheave main shaft 4.1, and the driving end is directly mounted on the load side output shaft of the DC motor 7.1.

[0035] The armature winding of one of the DC motors 7.1 can be powered by one of the three-phase DC speed controllers, whose DC output is 6 pulses, such as... Figure 3 As shown; it can also be powered by two identical three-phase DC speed controllers, forming a series 12-pulse system, such as... Figure 4 As shown, or forming 12 parallel pulses, such as Figure 5 As shown; the series (parallel) connection refers to connecting the output sides of two three-phase DC speed controllers in series (parallel) to provide 0~U to the armature winding. e An adjustable voltage power supply. The 6-pulse refers to 6 rectifier waves in one cycle, and the 12-pulse refers to 12 rectifier waves in one cycle. Compared with the 6-pulse, the 12-pulse DC output has higher quality and lower harmonic components.

[0036] Figure 4 In this system, the two three-phase DC speed controllers 6.1 and 6.2, which form a 12-pulse system, exchange data through communication. One of the three-phase DC speed controllers (such as 6.1) is the master and the other (such as 6.2) is the slave, thus realizing master-slave control.

[0037] Figure 5 When the excitation device 6.3 is selected as a small three-phase DC speed controller, it exchanges data with the two three-phase DC speed controllers 6.1 and 6.2 that make up the 12-pulse operation via communication. The preferred scheme is to use the excitation device 6.3 as the master and the two three-phase DC speed controllers 6.1 and 6.2 that make up the 12-pulse operation as slaves, realizing one master and two slave control, which facilitates switching from 12-pulse operation to 6-pulse operation. That is, the two three-phase DC speed controllers 6.1 and 6.2 that supply power to the armature winding form a 12-pulse operation. If one of them (such as 6.2) stops operating for some reason, only one three-phase DC speed controller (such as 6.1) will be running, which is a 6-pulse operation. If the preferred scheme is not adopted, this process usually requires modification of the corresponding application program.

[0038] exist Figure 4 and Figure 5 In this configuration, the host machine is equipped with a speed loop and a current loop, while the slave machine is equipped with only a current loop. Figure 4 In this process, the photoelectric encoder 2.3a is connected to the speed feedback interface of the three-phase DC speed controller 6.1, which serves as the host. Figure 5 In this process, the photoelectric encoder 2.3a is connected to the speed feedback interface of the three-phase DC speed controller 6.3, which serves as the host.

[0039] The clutches 3a and 3b can be electromagnetic clutches, hydraulic clutches, or pneumatic clutches, with electromagnetic clutches being preferred. By de-energizing and energizing the electromagnet in the clutch, it is easy to control the disengagement or engagement of the clutch. However, if a suitable hydraulic source is available, a hydraulic clutch is preferred; if a suitable pneumatic source is available, a pneumatic clutch is preferred.

[0040] In order for the aforementioned top wheel to also function as a driving wheel. Figures 1-5 In this design, through optimized design and the selection of high-quality materials, the overall components of the sheave 4, including the hub 4.0, main shaft 4.1, rope pulley 4.2, and other parts such as bearings and bases, are all made of high-strength materials. The wire rope pad 4.3 is preferably made of a high-friction coefficient material. This friction coefficient, under the action of the lifting wire rope 5, ensures that the traction force generated and the strength of the sheave meet the load requirements during standby and emergency lifting. Furthermore, anti-slip calculations should be performed with reference to friction hoists when necessary.

[0041] Reference Figure 1 and Figure 2 In an embodiment, the present invention proposes an AC backup power assembly based on the sheave of a mine hoist, requiring the sheave main shaft 4.1 to have a single or double output shaft, which is connected to the load-side output shafts of AC motors 2.1a and 2.1b respectively via clutches 3a and 3b; (Refer to...) Figures 3-5 In one embodiment, the present invention proposes a DC backup power assembly based on the sheave of a mine hoist. The sheave main shaft 4.1 is connected to the load-side output shaft of a DC motor 7.1 via a clutch 3a. Thus, the sheave 4 has driving force. Under normal conditions, the sheave guides the hoisting wire ropes 5, and the sheave 4 remains the driven sheave. Once the normal driving force source of the mine hoist becomes unavailable, the backup power assembly based on the sheave of the mine hoist described in this invention can be activated, and the sheave 4 becomes the driving sheave for backup or emergency hoisting until the task is completed.

[0042] It should be noted that the above description is only a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. Any equivalent transformation based on the technical solution of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A backup power assembly based on the head sheave of a mine hoist, characterized in that: The backup power assembly includes a speed regulating device, an electric motor, a photoelectric encoder, a clutch, and a sheave. The electric motor is either a low-speed motor or a high-speed motor with a reducer. The sheave serves as the driving wheel within the backup power assembly, specifically: the driven end of the clutch is mounted on the output shaft of the sheave's main shaft, and the driving end is mounted on the low-speed shaft of the reducer. The high-speed shaft of the reducer is connected to the load-side output shaft of the high-speed motor via a coupling. The reducer can be integrated into the high-speed motor, forming a high-speed semi-direct-drive connection. Alternatively, the driving end of the clutch can be directly mounted on the load-side output shaft of the low-speed motor, forming a low-speed direct-drive connection. The photoelectric encoder is mounted on the motor and driven by its non-load-side output shaft. Under normal conditions, the sheave only guides the hoisting wire rope and remains a driven wheel. Once the mine hoist's regular driving power source becomes unavailable, the backup power assembly is activated, and the sheave becomes the driving wheel for backup or emergency hoisting until the task is completed.

2. The backup power assembly based on the head sheave of a mine hoist as described in claim 1, characterized in that: The motor is an AC motor, and the speed control device is a variable frequency speed control device; the three phases of the input side of the variable frequency speed control device are connected to the main power supply device, and its output is connected to the stator winding of the AC motor, providing 0~f power to the stator winding. e Variable frequency power supply, f e The rated frequency of the AC motor is specified; the photoelectric encoder is connected to the speed feedback interface in the variable frequency speed control device, providing the variable frequency speed control device with the angle or position of the AC motor rotor and forming a speed closed-loop control.

3. A backup power assembly based on a mine hoist sheave as described in claim 2, characterized in that: The AC motor is an AC asynchronous motor or an AC synchronous motor. The AC synchronous motor is of permanent magnet type or separately excited type. The type of drive motor set in the selected frequency converter or its application software must match the type of the AC motor.

4. A backup power assembly based on a mine hoist sheave as described in claim 1, characterized in that: The motor is a DC motor, and the speed control device consists of a three-phase DC speed controller and an excitation device. The three phases of the input side of the three-phase DC speed controller are connected to the main power supply device, and its output is connected to the armature winding of the DC motor, providing 0~U to the armature winding. e Adjustable voltage power supply, U e The rated voltage of the DC motor is specified; the photoelectric encoder is connected to the speed feedback interface of the three-phase DC speed controller to provide the DC motor speed to the three-phase DC speed controller and form a speed closed-loop control; the three-phase or single-phase input side of the excitation device is connected to the auxiliary power supply device, and its output is connected to the excitation winding of the DC motor to provide the excitation current to the excitation winding.

5. A backup power assembly based on a mine hoist sheave as described in claim 4, characterized in that: The excitation device is a small three-phase DC speed controller, or a single-phase excitation rectifier built into the three-phase DC speed controller that supplies power to the armature winding.

6. A backup power assembly based on a mine hoist sheave as described in claim 4, characterized in that: The armature winding of one DC motor can be powered by one three-phase DC speed controller with a DC output of 6 pulses; alternatively, it can be powered by two three-phase DC speed controllers of the same specifications, forming a series 12 or parallel 12-pulse configuration. The two three-phase DC speed controllers forming the 12-pulse configuration exchange data via communication, with one of the three-phase DC speed controllers acting as the master and the other as the slave. When the excitation device is selected as a small three-phase DC speed controller, it exchanges data with the two three-phase DC speed controllers forming the 12-pulse configuration via communication. The master device is equipped with both a speed loop and a current loop, while the slave device is only equipped with a current loop. The photoelectric encoder is only connected to the speed feedback interface of the master three-phase DC speed controller.

7. A backup power assembly based on a mine hoist sheave as described in claim 1, characterized in that: The clutch is an electromagnetic clutch, a hydraulic clutch, or a pneumatic clutch.

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