CN212514921U - Coal-winning machine rocking arm loading test device - Google Patents

Coal-winning machine rocking arm loading test device Download PDF

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Publication number
CN212514921U
CN212514921U CN202021006427.XU CN202021006427U CN212514921U CN 212514921 U CN212514921 U CN 212514921U CN 202021006427 U CN202021006427 U CN 202021006427U CN 212514921 U CN212514921 U CN 212514921U
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rocker arm
active front
test device
loading test
transformer
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CN202021006427.XU
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刘坤
赵学宽
胡平
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Qingdao CCS Electric Corp
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Qingdao CCS Electric Corp
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Abstract

The utility model discloses a coal-winning machine rocking arm loading test device, include: a first transformer having a primary side connected to the power grid side; the active front-end type frequency converter comprises an active front-end rectifying unit and an inverting unit, wherein the input end of the active front-end rectifying unit is connected with the secondary side of the first transformer, and the output end of the active front-end rectifying unit is connected with the input end of the inverting unit; the test-accompanying motor is driven by the active front-end type frequency converter and provides load for the rocker arm of the coal mining machine; a control unit connected to the active front-end type frequency converter; when the cutting motor is driven in the rocker arm of the coal mining machine, the accompanying motor rotates along with the cutting motor. The utility model adopts the active front-end frequency converter to load the rocker arm, so that the energy can be recovered, and the energy consumption is reduced; different loads are loaded in a simulation mode, and performance detection of the rocker arm under different load conditions is facilitated.

Description

Coal-winning machine rocking arm loading test device
Technical Field
The utility model relates to a mining equipment technical field especially relates to a coal-winning machine rocking arm loading test device.
Background
The coal mining machine is used as the foremost equipment for coal mining, and in order to meet the requirement of production capacity, the installed power of the coal mining machine is increased, and the power of the corresponding rocker arm of the coal mining machine is also increased.
The normal performance of the rocker arm of the coal mining machine is a prerequisite guarantee for the normal work of the coal mining machine, so that the effective detection of the rocker arm of the coal mining machine is always a concern for enterprises producing and overhauling coal mining machines. The coal mining machine rocker arm is internally provided with a cutting motor for cutting a coal wall, and whether the performance of the coal mining machine rocker arm is normal or not is detected, namely whether the performance of the cutting motor in the coal mining machine rocker arm is normal or not is detected.
At present, the application of a hydraulic dynamometer and an electric eddy current dynamometer to load testing of a motor in the field of motor dragging is widely realized by adopting the hydraulic dynamometer and the electric eddy current dynamometer to provide load for the tested motor, and the loading test of a rocker arm of a coal mining machine can also adopt a dynamometer method to carry out loading test, but the method has high energy consumption and poor low-speed loading performance.
Disclosure of Invention
The utility model aims at providing a coal mining machine rocker arm loading test device, which adopts an active front-end type frequency converter to load a rocker arm, can realize energy recovery and reduce energy consumption; different loads are loaded in a simulation mode, and performance detection of the rocker arm under different load conditions is facilitated.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:
the utility model provides a coal-winning machine rocking arm loading test device which characterized in that includes: a first transformer having a primary side connected to the power grid side; the active front-end type frequency converter comprises an active front-end rectifying unit and an inverting unit, wherein the input end of the active front-end rectifying unit is connected with the secondary side of the first transformer, and the output end of the active front-end rectifying unit is connected with the input end of the inverting unit; the test-accompanying motor is driven by the active front-end type frequency converter and provides load for the rocker arm of the coal mining machine; a control unit connected to the active front-end type frequency converter; when the cutting motor in the rocker arm of the coal mining machine is driven, the accompanying motor rotates along with the cutting motor.
The coal mining machine rocker arm loading test device further comprises: a first incoming switchgear, which connects the grid side and the primary side of the first transformer; the first outgoing line switch cabinet is connected between the secondary side of the first transformer and the input end of the active front-end type frequency converter; the first incoming line switch cabinet and the first outgoing line switch cabinet are respectively connected with the control unit.
The coal mining machine rocker arm loading test device further comprises: the speed reducer is provided with a low-speed shaft and a high-speed shaft, and a driving shaft of the accompanying motor is connected with a high-speed shaft pair wheel of the speed reducer; and the coupling is connected with a low-speed shaft of the speed reducer and an output shaft of the driving end of the coal mining machine rocker arm.
According to the loading test device for the rocker arm of the coal mining machine, the coupler is a universal joint coupler.
The coal mining machine rocker arm loading test device further comprises: and the encoder is arranged on a driving shaft of the accompanying motor and is connected with the active front-end type frequency converter.
According to the coal mining machine rocker arm loading test device, the secondary side of the first transformer adopts double windings, and the double windings are shifted by 30 degrees to supply power to the active front end rectifying unit.
The coal mining machine rocker arm loading test device further comprises: a second transformer having a primary side connected to the power grid side; and the soft starter is connected with the secondary side of the second transformer and is respectively connected with the cutting motor and the control unit in the rocker arm of the coal mining machine.
The coal mining machine rocker arm loading test device further comprises: a second incoming switchgear, which connects the grid side and the primary side of the second transformer; the second outgoing line switch cabinet is connected between the secondary side of the second transformer and the soft starter; the second incoming line switch cabinet and the second outgoing line switch cabinet are respectively connected with the control unit.
According to the loading test device for the rocker arm of the coal mining machine, the soft starter is a medium-high voltage soft starter.
According to the loading test device of the coal mining machine, the control unit is a data acquisition control unit arranged at a computer end.
Compared with the prior art, the utility model discloses an advantage is with positive effect: the output torque of the active front-end type frequency converter is controlled, different load loading of the rocker arm of the coal mining machine is simulated, the mechanical and electrical performance of the rocker arm of the coal mining machine under different load conditions can be conveniently detected, the comprehensive performance detection of the rocker arm is realized, the accompany motor is driven to rotate when the rocker arm of the coal mining machine is driven to work, the accompany motor belongs to dragged equipment and is in a power generation state, the electric energy generated is fed back to a power grid through the active front-end rectifying unit, the energy consumption in the loading process is reduced, and the energy conservation and consumption reduction are realized.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is an architecture diagram of an embodiment of a loading test device for a rocker arm of a coal mining machine according to the present invention;
fig. 2 is a schematic diagram of another embodiment of the loading test device for the rocker arm of the coal mining machine according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
In order to realize different load loading of the coal mining machine rocker arm and detect the mechanical property and the electrical property of the coal mining machine rocker arm, the embodiment provides a loading test device for the coal mining machine rocker arm.
The shearer ranging arm loading test device is described below in conjunction with fig. 1.
Three-phase alternating-current voltage on the power grid side is reduced by a first transformer 1 and then input to an active front-end type frequency converter 2. Voltage harmonics from the mains side can be filtered out with the first transformer 1.
In the present embodiment, a first incoming switchgear AH1 is provided between the primary side and the grid side of the first transformer 1, and a first outgoing switchgear AH2 is provided between the secondary side of the first transformer 1 and the input of the active front-end converter 2.
First inlet wire cubical switchboard AH1 and first outlet wire cubical switchboard AH2 are connected with the control unit 3 respectively, and this embodiment the control unit 3 is the data acquisition the control unit of computer end, for example the host computer, provides visual operation. The control unit 3 can remotely control the opening and closing of the first incoming switchgear AH1 and the first outgoing switchgear AH 2.
The Active Front End (AFE) type frequency converter 2 includes an Active Front End rectifying unit (i.e., AFE rectifying unit) 21 and an inverting unit 22. The AFE rectification unit 21 of this embodiment includes a filter circuit, a rectifier circuit, and a dc capacitor at the front end, and the dc voltage finally output is applied to the dc bus.
The AFE rectifying unit 21 of the present embodiment is a rectifying unit familiar to those in the power electronics field, which uses an IGBT power element, and is equivalent to an inverter, and the input is ac and the output is dc, and the AFE rectifying unit 21 does not passively convert ac into dc, and has an active control function, and when the bus voltage on the dc bus is higher than a set value, the AFE rectifying unit 21 converts dc into ac to feed back to the grid side, thereby achieving energy recovery.
In the present application, the secondary side of the first transformer 1 employs dual windings, for example, one secondary winding of the secondary side is star-shaped, and one secondary winding of the secondary side is triangle-shaped, and both are shifted by 30 ° to form 12-pulse rectification. By adopting 12-pulse rectification, the harmonic content generated in the operation process of the AFE type frequency converter 2 is greatly reduced, and the input harmonic current is reduced.
The accompanying motor 4 is connected with the AFE type frequency converter 2, the output torque of the AFE type frequency converter 2 loaded on the accompanying motor 4 is changed, different loads of the rocker arm 5 of the coal mining machine can be simulated, and therefore the mechanical performance and the electrical performance of the rocker arm 5 are tested under the condition that the rocker arm 5 of the coal mining machine has different loads.
The accompanying motor 4 is connected with the drive end of the coal mining machine rocker arm 5, after the coal mining machine rocker arm 5 is started, the accompanying motor 4 can be driven to rotate together, the accompanying motor 3 belongs to the dragged equipment at the moment and is in a power generation state, and the accompanying motor 4 is connected with the AFE type frequency converter 2, so that electric energy sent by the accompanying motor 4 can be fed back to the power grid side through the AFE type frequency converter 2, and energy recovery is realized. In the whole loading test process, except for the heat loss and the transmission loss of equipment, other energy is completely fed back to the power grid, so that the energy conservation and the consumption reduction are realized.
In the embodiment, the accompany motor 4 is connected with the driving end of the rocker arm 5 of the coal mining machine through a speed reducer 6.
The reduction gear 6 has a low-speed shaft and a high-speed shaft, and the drive shaft of the test-assist motor 4 and the high-speed shaft of the reduction gear 6 are connected by, for example, a pair wheel, a coupling, or the like.
The low-speed shaft of the speed reducer 6 is connected with the output shaft of the driving end of the shearer ranging arm 5 through a pair wheel, a coupling and the like. The low-speed shaft of the speed reducer 6 is connected with the output shaft of the driving end of the coal mining machine rocker arm 5 through the universal joint coupler 7, the requirement on concentricity of the universal joint coupler 7 to the two connecting shafts is low, the angle compensation capacity is high, and the installation is simple.
An encoder (not shown) is installed at the shaft end of the driving shaft of the accompanying motor 4, specifically, the encoder is an increment, the encoder detects the output rotating speed of the accompanying motor 4 and transmits a detection signal to the AFE type frequency converter 2, so that the AFE type frequency converter 2 can rapidly detect the output rotating speed of the accompanying motor 4 and can synchronously start the cutting motor in the following rocker arm 5 of the coal mining machine.
The driving of the shearer rocker arm 5 can be driven in the existing driving manner.
In this application, be directed to the utility model discloses a coal-winning machine rocking arm loading test device has still designed the drive mode to coal-winning machine rocking arm 5, see fig. 2.
The three-phase alternating current voltage on the power grid side is reduced by the second transformer 8 and then supplies power to the cutting motor in the coal cutter rocker arm 5 through the soft starter 9. The soft starter 9 of the present embodiment is a medium-high voltage soft starter.
Voltage harmonics from the grid side can be filtered out with the second transformer 8.
The soft starter 9 is connected with the control unit to realize smooth soft start of the cutting motor in the rocker arm 5 of the coal mining machine, and when the soft starter 9 detects that the starting current is less than 30% of the rated load current, the soft starter is automatically switched to a power frequency loop to realize the soft start process of the cutting motor in the rocker arm 5 of the coal mining machine.
In the present embodiment, a second incoming switchgear AH3 is provided between the primary side and the grid side of the second transformer 8, and a second outgoing switchgear AH4 is provided between the secondary side of the second transformer 8 and the soft starter 9.
The second incoming switchgear AH3 and the second outgoing switchgear AH4 are connected to the control unit 3, respectively, which can remotely control the opening and closing of the second incoming switchgear AH3 and the second outgoing switchgear AH 4.
The soft starter 9 is controlled to start by a closing feedback signal of the second outlet switch cabinet AH 4.
In the soft start process of the cutting motor, the accompanying motor 4 driven by the AFE type frequency converter 2 follows the cutting motor to realize tracking start. After the start-up is completed, the control unit 3 may give the magnitude of the output torque of the AFE type frequency converter 2, and provide a load for the rocker arm 5 of the coal mining machine by controlling the AFE type frequency converter 2 to output the torque to the test motor 4.
By means of the loading test device for the rocker arm of the coal mining machine, the loading test process is as follows.
(1) The control unit 3 remotely controls AH1, AH2 and AH3 to be switched on, and the AFE type frequency converter 2 enters a pre-starting state after charging is completed;
(2) the control unit 3 remotely controls AH4 to be switched on, and the soft starter 9 is controlled to be started through a switching-on feedback signal of AH 4;
(3) in the starting process of the soft starter 9, the accompany-testing motor 4 follows the rotation speed of cutting electricity to realize tracking starting;
(4) after the start-up is completed, the control unit 3 controls the AFE type frequency converter 2 to load the companion motor 4 with a set output torque to simulate the load of the shearer ranging arm 5.
The torque output by the AFE type frequency converter 2 can be changed, the mechanical and electrical properties of the coal mining machine rocker arm 4 under different load conditions can be simulated, and whether the production and maintenance of the coal mining machine rocker arm 4 meet the quality requirements or not can be judged quickly and accurately; and the AFE type frequency converter 2 is adopted to realize energy recovery in the loading test stage, so that energy is saved, consumption is reduced, the test cost is greatly reduced, and the whole set of test device is simple to install and stable to operate.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims (10)

1. The utility model provides a coal-winning machine rocking arm loading test device which characterized in that includes:
a first transformer having a primary side connected to the power grid side;
the active front-end type frequency converter comprises an active front-end rectifying unit and an inverting unit, wherein the input end of the active front-end rectifying unit is connected with the secondary side of the first transformer, and the output end of the active front-end rectifying unit is connected with the input end of the inverting unit;
the test-accompanying motor is driven by the active front-end type frequency converter and provides load for the rocker arm of the coal mining machine;
a control unit connected to the active front-end type frequency converter;
when the cutting motor in the rocker arm of the coal mining machine is driven, the accompanying motor rotates along with the cutting motor.
2. The shearer loader arm loading test device of claim 1, further comprising:
a first incoming switchgear, which connects the grid side and the primary side of the first transformer;
the first outgoing line switch cabinet is connected between the secondary side of the first transformer and the input end of the active front-end type frequency converter;
the first incoming line switch cabinet and the first outgoing line switch cabinet are respectively connected with the control unit.
3. The shearer loader arm loading test device of claim 1 or 2, further comprising:
the speed reducer is provided with a low-speed shaft and a high-speed shaft, a driving shaft of the test accompanying motor is connected with the high-speed shaft of the speed reducer, and the low-speed shaft of the speed reducer is connected with the driving end of the coal mining machine rocker arm.
4. The coal mining machine rocker arm loading test device according to claim 3, characterized in that a driving shaft of the accompanying motor is connected with a high-speed shaft pair wheel of the speed reducer; the coal mining machine rocker arm loading test device further comprises:
and the universal joint coupler is connected with the low-speed shaft of the speed reducer and the output shaft of the driving end of the coal mining machine rocker arm.
5. The shearer loader arm loading test device of claim 1, further comprising:
and the encoder is arranged on a driving shaft of the accompanying motor and is connected with the active front-end type frequency converter.
6. The shearer rocker arm loading test device as claimed in claim 1, wherein the secondary side of the first transformer adopts a double winding, and the phase of the double winding is shifted by 30 ° to supply power to the active front end rectifying unit.
7. The shearer loader arm loading test device of claim 3, further comprising:
a second transformer having a primary side connected to the power grid side;
and the soft starter is connected with the secondary side of the second transformer and is respectively connected with the cutting motor and the control unit in the rocker arm of the coal mining machine.
8. The shearer loader arm loading test device of claim 7, further comprising:
a second incoming switchgear, which connects the grid side and the primary side of the second transformer;
the second outgoing line switch cabinet is connected between the secondary side of the second transformer and the soft starter;
the second incoming line switch cabinet and the second outgoing line switch cabinet are respectively connected with the control unit.
9. The shearer rocker arm loading test device of claim 7, wherein the soft starter is a medium-high voltage soft starter.
10. The shearer rocker arm loading test device of claim 1, wherein the control unit is a data acquisition control unit disposed at a computer end.
CN202021006427.XU 2020-06-04 2020-06-04 Coal-winning machine rocking arm loading test device Active CN212514921U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021006427.XU CN212514921U (en) 2020-06-04 2020-06-04 Coal-winning machine rocking arm loading test device

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Application Number Priority Date Filing Date Title
CN202021006427.XU CN212514921U (en) 2020-06-04 2020-06-04 Coal-winning machine rocking arm loading test device

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CN212514921U true CN212514921U (en) 2021-02-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114112470A (en) * 2021-11-30 2022-03-01 上海煤科检测技术有限公司 Control system and method for satisfying loading of rocker arms of various types of coal mining machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114112470A (en) * 2021-11-30 2022-03-01 上海煤科检测技术有限公司 Control system and method for satisfying loading of rocker arms of various types of coal mining machines

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