WO2013020384A1

WO2013020384A1 - Cutting speed regulating system and boring machine

Info

Publication number: WO2013020384A1
Application number: PCT/CN2012/073762
Authority: WO
Inventors: 黄向阳; 刘召安; 易定忠; 刘兴利; 谷晓黎
Original assignee: 三一重型装备有限公司; 三一重型综采成套装备有限公司
Priority date: 2011-08-05
Filing date: 2012-04-11
Publication date: 2013-02-14
Also published as: CN102305070A

Abstract

Disclosed is a cutting speed regulating system. The cutting speed regulating system comprises: a frequency converter (1) for receiving an electric current from a power supply and modulating the amplitude of the electric current; a cutting electric motor (2) electrically connected to the frequency converter (1) for receiving the electric current outputted by the frequency converter (1) after the amplitude modulation thereof and outputting a corresponding torque and rotational speed according to the amplitude of the electric current; and a cutting head (5) driven by the cutting electric motor (2) for cutting a coal seam. Also disclosed is a boring machine with the cutting speed regulating system. The cutting speed regulating system is capable of changing the torque and rotational speed outputted by the cutting electric motor by using the frequency converter, so as to achieve stepless speed regulation.

Description

The invention relates to a Chinese patent application filed on August 5, 2011, the Chinese Patent Office, the application number is 201110224435.0, and the invention name is "a cutting speed control system and a roadheader". Priority is hereby incorporated by reference in its entirety.

Technical field

The invention relates to the field of engineering machinery, in particular to a cutting speed regulation system and a roadheader.

Background technique

During the tunneling process of coal mine roadway, due to the complicated structure of coal seam, the degree of soft and hard changes is irregular. In order to adapt to the complicated working conditions in the underground, it is easy to think of: low-speed large torque cutting for hard coal seams and high-speed cutting for soft coal seams to improve cutting efficiency. However, due to limitations in process and strength, the current roadheader can only achieve speed adjustment of 2-4 grades, and can not achieve perfect matching of cutting output speed, torque and coal seam hardness. In addition, in the prior art, the existing cutting system usually uses a single (double) speed motor to mechanically mesh with a single (multi) speed ratio gearbox, and is manually or automatically completed according to the operator's personal experience, current detection value, etc. 2~ 4 levels of speed regulation. Most of them are controlled by high-low speed switching and tunneling speed control by manual operation. The cutting motor fluctuates within a large range such as overload and underload, which is not conducive to improving work efficiency and reliability.

In the prior art, the cutting speed control system has the following problems: 1. The variable pole speed regulating motor has a large volume, the manufacturing technology is difficult, and the pole speed is regulated; 2. The meshing of the gears is matched with the two-speed motor, at most only Can have 4 different speeds, and the stability of the multi-speed ratio reducer is poor; 3, can not achieve the cutting head speed, torque continuous stepless adjustment; 4, speed control switching mostly rely on personal experience, the judgment is fuzzy, inaccurate.

Summary of the invention

The invention provides a cutting speed regulating system and a roadheading machine, which can change the output speed and torque of the cutting motor by using the frequency converter, thereby realizing stepless speed regulation.

The technical solution of the present invention is implemented as follows:

A cutting speed control system is applied to a roadheader in the field of coal mining, comprising: a frequency converter for receiving a power supply current and adjusting the amplitude of the current;

Cutting the motor, electrically connecting with the frequency converter, for receiving the current output by the frequency converter after adjusting the amplitude, and outputting the corresponding torque and the rotation speed according to the amplitude of the current; The cutting head is driven by the cutting motor for cutting the coal seam.

Preferably, the method further includes:

a speed reducing mechanism is disposed between the cutting motor and the cutting head.

Preferably, the method further includes:

The controller is configured to output a control signal, and the inverter controls the frequency converter to adjust the amplitude of the current.

Preferably, the method further includes:

An encoder is disposed on the cutting motor, and a feedback end of the encoder is further connected to the frequency converter, configured to detect an operating condition of the cutting motor, and output a first condition of the cutting motor Sending information to the frequency converter, analyzing and processing the first status information by the frequency converter, and transmitting the information to the controller;

The controller generates the control signal according to the first status information after the analysis and processing of the frequency converter.

Preferably, the method further includes:

a sensor group, disposed on the cutting motor and the cutting head, configured to detect a working condition of each component, and output a second operating condition parameter to be sent to the controller;

The controller generates the control signal according to the first status information and the second operating condition parameter after the frequency converter analyzes the processing.

Preferably, the second part parameter comprises: any one or a combination of a temperature parameter, a stress parameter, a load parameter, a vibration parameter, and an impact parameter.

Preferably, the method further includes:

A reactance filtering module is disposed on the frequency converter for eliminating harmonics and electromagnetic dryness when the frequency converter is in operation.

Preferably, the method further includes:

A damper device is disposed on the frequency converter for mitigating vibration of the frequency converter during operation. Preferably, the method further includes:

A cooling device is disposed on the frequency converter for cooling the frequency converter.

A roadheader for use in the field of coal tunneling, including a roadheader body, further comprising a cutting speed control system as described above, the cutting speed control system being disposed in the roadheader body.

The technical scheme of the invention uses the frequency converter to change the output speed and torque of the cutting motor, thereby enabling It is enough to realize stepless speed regulation, instead of speed regulation or variable pole speed regulation through mechanical structure, which can reduce the volume and manufacturing difficulty of cutting motor; further, the inverter and encoder can monitor the running current of cutting motor current and speed in real time. And the feedback controller; the sensor group monitors the cutting temperature, stress change, load change, vibration, shock and other working condition parameters in real time and feeds back the controller, so that the speed cutting is more accurate, stable, and adaptive, so that it can be intelligent Analyze and identify the cutting coal seam information, and automatically adjust the matching cutting output mode.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a schematic structural view of a first embodiment of a cutting speed control system according to the present invention;

2 is a schematic diagram of the principle of a cutting speed control system according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The cutting speed control system of the present invention is applied to a roadheader in the field of coal tunneling. Referring to FIG. 1 and FIG. 2, in an embodiment of a cutting speed control system of the present invention, the cutting speed regulation System 100 includes a frequency converter 1, a cutting motor 2, and a cutting head 5.

The frequency converter 1 is configured to receive a power supply current and adjust the amplitude of the current.

The power supply current may be an external AC power source current or other power source current, and the magnitude of the current refers to a current voltage, a current frequency, and the like.

The cutting motor 2 is electrically connected to the frequency converter 1 for receiving the current output by the frequency converter 1 after adjusting the amplitude, and outputting the corresponding torque and the rotation speed according to the magnitude of the current. The amplitude and the frequency of the current are different, and the torque and the rotational speed of the cutting motor 2 are also different. The torque and the output of the cutting motor 2 correspond to the voltage and frequency of the current. relationship.

For example, the formula for the speed of an asynchronous motor:

n = 60f(l - s) / p .

And the relationship between rated torque and speed of the motor:

Γ = 9550 Ρ / « ;

Among them, cutting speed ", cutting torque? \ frequency ^, pole logarithm Ρ, slip power P; It is known that the change of the input frequency of the cutting motor 2 will change the speed and torque of the cutting motor 2 Thus, the cutting torque of the cutting head 5 can be affected.

The cutting head 5 is driven by the cutting motor 2 for cutting the coal seam.

Further, the cutting speed adjustment system 100 further includes:

The speed reduction mechanism 4 is disposed between the cutting motor 2 and the cutting head 5 for reducing the rotation speed of the cutting head 5 and increasing the torque.

The speed reduction mechanism 4 is a power transmission mechanism that uses a gear speed converter to decelerate the number of revolutions of the motor to a desired number of revolutions and obtain a large torque.

Further, the cutting speed adjustment system 100 further includes:

The controller 6 is configured to output a control signal, and the inverter 1 is controlled by the control signal to adjust the amplitude of the current.

In an embodiment of the invention, the cutting speed control system 100 further includes:

An encoder 3 is disposed on the cutting motor 2, and a feedback end of the encoder 3 is further connected to the frequency converter 1 for detecting an operating condition of the cutting motor 2, and outputting the cutting The first status information of the motor 2 is sent to the frequency converter 1, and the frequency converter 1 analyzes the first status information and transmits the result to the controller 6.

The controller 6 generates the control signal according to the first status information after the inverter 1 analyzes the processing.

The encoder 3 is arranged on the cutting motor 2, which can realize the time and space positioning of the cutting motor 2, determine the working condition of the cutting motor 2, and connect with the inverter 1 through the feedback end of the encoder 3, More accurate analysis of the state of the cutting motor 2 in real time. The encoder 3 realizes the detection of the working condition of the cutting motor 2, that is, the running speed and position of the cutting motor 2 The analysis is performed, and the corresponding information is fed back to the inverter 1, and the inverter 1 analyzes the feedback information and transmits it to the controller 6.

The sensor group 7 is disposed on the cutting motor 2 and the cutting head 5 for detecting the working condition of each component, and outputting the second operating condition parameter to the controller 6;

The controller 6 generates the control signal according to the first status information and the second condition parameter after the inverter 1 analyzes the processing.

In addition to being disposed on the cutting motor 2 and the cutting head 5, the sensor group 7 can also be disposed on other component parts. For example, the sensor group 7 can also be disposed on the speed reducing mechanism 4. The sensor group 7 can consist of a plurality of sensor elements.

The second part parameter includes: a combination of any one or several of a temperature parameter, a stress parameter, a load parameter, a vibration parameter, and an impact parameter.

The controller 6 analyzes the temperature, stress change, shock, load, and the like detected by the sensor group 7, and sends a control command to the inverter 1. After receiving the controller 6 command, the inverter 1 performs variable frequency control and changes the output frequency, thereby changing the input frequency of the cutting motor 2, realizing the control of the cutting motor 2 speed and torque, and improving the cutting efficiency.

Since the frequency converter 1 can continuously change the frequency, the magnitude of the torque can be changed at any time to achieve self-adaptation. When encountering a soft coal seam, the problem that the feed force is too small to make the cutting motor 2 unloaded and unloaded can be changed; when encountering a hard coal seam, the current state of the feed force can be changed to make the cutting motor 2 overload and overcurrent .

In actual operation, the cutting efficiency of the cutting head 5 is related to many factors, such as the working characteristics of the cutting motor 2, the cutting arrangement of the cutting head 5, the cutting action path, and the coal seam characteristics. Here, only the relationship between the cutting speed of the cutting motor 2, the cutting torque, the feed force F and the cut coal seam is analyzed, and an analysis model is given, and it cannot be determined that it has the technical solution of the present invention. Any restrictions.

Given a characteristic coal seam model, set the cutting efficiency to 2 and set other factors, including:

Q( function) ― Z(F, n,T, other elements) . For the established coal seam cutting efficiency model, through the theoretical analysis and experimental tests, the corresponding cutting simulation test parameters can be obtained:

Q ⁼ (<?1 ' ^2 ^3... In) F = (F ₁ , F ₂ , F ₃ ...... F _n )

n = (n ₁ , n ₂ , n _i n _n )

Γ = (Γ Γ ₂ , Γ ₃ T _n ) introduce constraints:

n = T(U,I ,p...), where [/-voltage, /-current, /-frequency, pole logarithm. Through mathematical calculation and simulation, the best cutting efficiency can be obtained with ² dishes and corresponding ^, ^η ^,

. It can be seen that if the operating characteristics ^η , ^τ ) of the cutting motor 2 are comprehensively adjusted by the variable pole frequency conversion technology, β→e _max will greatly improve the tunneling efficiency.

In addition, the cutting speed adjustment system 100 further includes:

The reactance filtering module is disposed on the frequency converter 1 and is used for eliminating the i-wave and the electromagnetic dry 4 when the inverter 1 is in operation.

When the inverter 1 is working, due to its own working characteristics, it will generate strong electromagnetic interference to the electrical grid and other electrical components in the circuit.

The invention adds a reactance filtering module at the front end of the frequency converter 1 to eliminate harmonics and electromagnetic interference, so that the input EMC (Electro Magnetic Compatibility) and the voltage and current harmonics all meet the relevant certification requirements, and there is almost no negative to the power grid and other circuits. influences.

In addition, the cutting speed adjustment system 100 further includes:

A damper device is disposed on the frequency converter 1 for mitigating vibration of the frequency converter 1 during operation.

The cutting speed control system 100 further includes:

A cooling device is disposed on the frequency converter 1 for cooling the frequency converter 1.

The technical scheme of the present invention uses the frequency converter 1 to change the output speed and torque of the cutting motor 2, thereby enabling stepless speed regulation, instead of speeding or variable pole speed regulation by a mechanical structure, thereby reducing the volume of the cutting motor 2 And manufacturing difficulty; further, the inverter 1, the encoder 3 real-time monitoring of the cutting motor 2 current, speed and other operating states and feedback controller 6; sensor group 7 real-time monitoring cutting temperature, stress changes, load changes, vibration, shock The parameters of the working conditions are fed back to the controller 6, which makes the speed cutting more accurate and stable, and has strong adaptability. It can intelligently analyze and identify the cutting coal seam information, and automatically adjust the matching cutting output mode.

In addition, the present invention also discloses a roadheader which is applied to the field of coal mining. The roadheader includes a roadheader body, and further includes the cutting speed control system described in the foregoing embodiments. 100, the cutting speed control system 100 is disposed in the roadheader body. Since the foregoing embodiments have described the composition and working principle of the cutting speed control system 100 in detail, for consideration of space, I will not repeat them here, refer to the description of the relevant section above.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Rights request

1. A cutting speed control system applied to a roadheader in the field of coal mining, characterized in that it comprises:

a frequency converter for receiving a power supply current and adjusting the amplitude of the current;

Cutting the motor, electrically connected to the frequency converter, for receiving the current output by the frequency converter after adjusting the amplitude, and outputting the corresponding torque and the rotation speed according to the amplitude of the current;

The cutting head is driven by the cutting motor for cutting the coal seam.

2. The cutting speed control system according to claim 1, further comprising: a speed reduction mechanism disposed between the cutting motor and the cutting head.

3. The cutting speed control system according to claim 2, further comprising: a controller, configured to output a control signal, wherein the frequency converter controls the frequency converter to adjust the magnitude of the current.

The cutting speed control system according to any one of claims 1 to 3, further comprising:

The cutting speed control system according to claim 4, further comprising: a sensor group disposed on the cutting motor and the cutting head for detecting working conditions of each component, and Outputting a second operating condition parameter to the controller;

The cutting speed control system according to claim 5, wherein the second part parameter comprises: one or more of a temperature parameter, a stress parameter, a load parameter, a vibration parameter, and an impact parameter. The combination.

7. The cutting speed control system according to claim 6, further comprising: The reactance filtering module is disposed on the frequency converter, and is used for eliminating harmonics and electromagnetic dryness of the inverter when working.

The cutting speed control system according to claim 7, further comprising: a damping device disposed on the frequency converter for mitigating vibration during operation of the frequency converter.

9. The cutting speed control system according to claim 8, further comprising: a cooling device disposed on the frequency converter for cooling the frequency converter.

10. A roadheader for use in the field of coal mining, comprising a roadheader body, characterized by further comprising a cutting speed control system according to any one of claims 1 to 9, said cutting speed control system It is disposed in the roadheader body.