CN110068514B - Tension-torsion composite fatigue testing device and method for circular chain of heavy-duty scraper conveyor - Google Patents
Tension-torsion composite fatigue testing device and method for circular chain of heavy-duty scraper conveyor Download PDFInfo
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- CN110068514B CN110068514B CN201910171418.1A CN201910171418A CN110068514B CN 110068514 B CN110068514 B CN 110068514B CN 201910171418 A CN201910171418 A CN 201910171418A CN 110068514 B CN110068514 B CN 110068514B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
Abstract
The invention discloses a tension-torsion composite fatigue testing device and a testing method for a ring chain of a heavy-duty scraper conveyor. The testing device disclosed by the invention can be used for carrying out a fatigue test on the flat ring and the vertical ring of the round-link chain under a tension-torsion composite working condition, monitoring tensile and torsion loads borne by the round-link chain, dynamically monitoring the crack initiation and expansion conditions of the round-link chain and monitoring the abrasion loss of the contact position of the vertical ring and the flat ring. The damage failure mechanism under the combined working condition of the vertical ring and the horizontal ring of the circular ring chain is researched, and the method has important significance for the reliability design and the safe service life prediction of the scraper conveyor.
Description
Technical Field
The invention relates to the technical field of mining industry, in particular to a tension-torsion composite fatigue testing device and method for a circular chain of a heavy-duty scraper conveyor.
Background
The fully mechanized mining technology is the most advanced underground mining technology at present, and the scraper conveyor is one of the key fully mechanized mining devices, not only plays a role in coal transportation, but also is a running track of a coal mining machine. With the continuous development of fully mechanized mining technology and the large-scale and deep-layer mining, the scraper conveyor is continuously developed towards the directions of high power, long conveying distance and high chain speed, namely a heavy-load scraper conveyor. Once the heavy-duty scraper conveyor fails due to failure, the production of a coal face is stopped, and further, the great economic loss of a large coal mine is caused.
The heavy-duty scraper conveyor utilizes a chain transmission principle, under the drive of a drive motor, a hydraulic coupler and a speed reducer, a scraper chain and a middle groove are respectively used as a traction mechanism and a supporting mechanism, and a chain wheel drives the stepless closed scraper chain to do continuous circulating motion on the middle groove, so that coal on the middle groove is conveyed to a machine head from a machine tail to be unloaded. As an important component of a traction mechanism of a scraper conveyor, a chain transmission system is formed by sequentially connecting circular chains (a flat ring and a vertical ring). In the operation process of the scraper conveyor, due to the polygon effect of a chain transmission system, frequent starting or stopping when the scraper conveyor is fully loaded or overloaded, and abnormal load effects such as coal wall caving and coal wall caving, the circular chain has vibration and impact characteristics, and further is subjected to the action of dynamic tension; uneven falling of the coal briquette, polygon effect and abnormal load action cause relative torsion of adjacent links of straight line segments of the round-link chain along the axis of the round-link chain, and simultaneously generate alternating torsion load. Under the coupling action of time-varying tension, alternating torsional load, relative torsional motion and contact load between chain rings, the circular chain is subjected to frictional wear and fatigue damage, so that the bearing capacity of the circular chain is reduced, and a chain breakage accident occurs when the damage amount of the circular chain reaches a limit value. According to statistics, 41.5% of scraper conveyor stops due to chain breakage of the round-link chain, and the service life of the round-link chain under the tension-torsion composite working condition is far shorter than that under the pure tensile load working condition, so that a system for monitoring damage (abrasion and fatigue damage) of a vertical ring and a horizontal ring of the round-link chain under the tension-torsion composite working condition is developed, the damage failure mechanism of the round-link chain is researched, and the system has important significance for reliability design and safe service life prediction of the scraper conveyor.
The current damage monitoring and testing machine for the scraper conveyor chain transmission system comprises: the patent number 201610566788.1 discloses a friction corrosion fatigue test device for a ring chain of a heavy-duty scraper conveyor, which realizes a friction corrosion fatigue test of the ring chain of the heavy-duty scraper conveyor; patent No. 201610852686.6 discloses a heavy-duty scraper conveyor sprocket friction fatigue monitoring devices under vibration impact realizes heavy-duty scraper conveyor sprocket friction fatigue experiment.
In the testing machine, the torsion load born by the flat ring and the vertical ring of the round-link chain cannot be considered, and the monitoring system cannot realize the real-time monitoring of the displacement field, the crack initiation and the crack propagation of the round-link chain.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a tension-torsion composite fatigue testing device and method for a circular chain of a heavy-duty scraper conveyor, which are used for performing a tension-torsion fatigue test on the circular chain, dynamically monitoring the dynamic tension, torque, torsion angle, displacement field and dynamic crack propagation of the circular chain (a flat ring and a vertical ring), and detecting the abrasion loss of the circular chain, so that the defects in the prior art are overcome, the operation is convenient, and the measurement result is comprehensive and reliable.
In order to achieve the purpose, the invention adopts the technical scheme that:
a tension-torsion composite fatigue testing device for a circular ring chain of a heavy-duty scraper conveyor comprises a rack, a torsion load loading system, a tension load loading system and a monitoring system;
the frame comprises at least three frame units, namely a first frame unit, a second frame unit and a third frame unit, wherein the first frame unit is provided with a tensile load driving device for supporting and loading tensile load;
the second rack unit is used for supporting the fixed guide rail;
the third rack unit is used for supporting the torsion driving device, the angle sensor bracket and the combined bearing seat;
the first rack unit, the second rack unit and the third rack unit are connected and fixed through connecting pieces in sequence;
the torsion load loading system comprises a torsion driving device, a combined bearing seat and a circular chain connecting clamp, wherein the torsion driving device is connected with the third rack unit through a bracket, and an output shaft of the torsion driving device is connected with the transition shaft through a coupler;
the combined bearing is connected with the third rack unit through a combined bearing seat, and the transition shaft penetrates through the combined bearing to be connected with the tension sensor; the other end of the tension sensor is connected with the round-link chain connecting clamp;
the tensile load loading system comprises a tensile load driving device, an anti-torsion slide block, a fixed U-shaped bolt and a guide rail, wherein the tensile load driving device is fixed on the first rack unit through threaded connection; the anti-twist slide block is connected with a driving shaft of the tensile load driving device through threads, so that the transmission of tensile load is realized;
the fixed U-shaped bolt is connected with the anti-twisting slide block, so that the tensile load application of the round-link chain is realized;
the anti-torsion sliding block is arranged on the guide rail in a sliding mode and used for bearing the torsion load transmitted to the guide rail by the round-link chain and preventing a piston rod of the hydraulic cylinder from bearing the torsion load;
the monitoring system comprises a tension sensor, a torque sensor, an angle sensor, a controller and a non-contact strain measurement system, wherein,
the tension sensor is arranged between the round-link chain connecting clamp and the transition shaft and is used for measuring the dynamic tension born by the round-link chain in real time;
the torsion sensor is arranged on an output shaft between the torsion driving device and the transition shaft and used for measuring the torque of the round-link chain in real time;
the angle sensor is arranged on an output shaft of the torsion driving device and used for measuring the torsion angle of the round-link chain in real time;
the controller is in signal connection with the tension sensor, the torsion sensor and the angle sensor;
the non-contact strain measurement system is used for acquiring a displacement field of the round-link chain during an experiment and monitoring crack initiation and expansion conditions of the flat ring and the vertical ring of the round-link chain in the experiment process.
The anti-torsion sliding block comprises a connecting plate and a vertical plate, wherein the connecting plate is horizontally arranged, the vertical plate is fixedly connected to the upper surface of the connecting plate, two ends of the bottom of the connecting plate, which are horizontally arranged, are respectively connected with the guide rail in a sliding mode through a sliding seat, and threaded holes used for being in threaded connection with a driving shaft of a tensile load driving device are formed in the vertical plate.
The combined bearing is a needle roller and thrust ball combined bearing.
The tensile load driving device is a hydraulic cylinder, the hydraulic cylinder is fixed on the first frame unit through threaded connection, and the anti-torsion sliding block is connected with a piston rod of the hydraulic cylinder through threads, so that the tensile load is transferred.
The torsion driving device is a torsion motor, the torsion motor is provided with two output shafts, one output shaft is connected with the angle sensor, and the other output shaft is connected with the transition shaft through a coupler.
The controller is a computer.
The non-contact strain measurement system is a VIC-3D measurement system.
A testing method of a tension-torsion composite fatigue testing device based on a ring chain of a heavy-duty scraper conveyor comprises the following steps:
step 1, connecting one end of a round-link chain with a round-link chain connecting clamp, and connecting the other end of the round-link chain with a fixed U-shaped bolt;
step 5, collecting output signals of the tension sensor, the torque sensor and the angle sensor and recording the output signals on the controller;
step 6, acquiring a displacement field of the round-link chain during an experiment through a non-contact strain measurement system, and monitoring crack initiation and expansion conditions of a flat ring and a vertical ring of the round-link chain during the experiment;
and 7, performing linear cutting on the round-link chain after the experiment to obtain a sample at the contact position of the flat ring and the vertical ring, and obtaining the wear appearance of the round-link chain through a three-dimensional contourgraph so as to obtain the wear loss of the round-link chain.
Has the advantages that:
the tension-torsion composite fatigue testing device for the round-link chain of the heavy-duty scraper conveyor can perform a fatigue test on the round-link chain flat ring and the vertical ring under a tension-torsion composite working condition, monitor tensile and torsional loads borne by the round-link chain, dynamically monitor crack initiation and expansion conditions of the round-link chain and monitor the abrasion loss of a contact position of the vertical ring and the flat ring. The damage failure mechanism under the combined working condition of the vertical ring and the horizontal ring of the circular ring chain is researched, and the method has important significance for the reliability design and the safe service life prediction of the scraper conveyor. The invention solves the defects of the prior art, is convenient to operate, and has visual, comprehensive and reliable measuring results.
Drawings
FIG. 1 is a schematic structural diagram of a tension-torsion composite fatigue testing device of a circular ring chain of a heavy-duty scraper conveyor according to the invention;
FIG. 2 is a schematic structural diagram of a torsion-proof sliding block of the tension-torsion composite fatigue testing device of the circular chain of the heavy-duty scraper conveyor;
FIG. 3 is a schematic structural diagram of a frame of the tension-torsion composite fatigue testing device of the round-link chain of the heavy-duty scraper conveyor of the invention;
FIG. 4 is a schematic view of the connection between the anti-twisting slide block and the guide rail of the tension-torsion composite fatigue testing device of the round-link chain of the heavy-duty scraper conveyor of the invention;
in the figure, 1, a first frame unit, 2, a hydraulic cylinder, 3, a second frame unit, 4, an anti-torsion slide block, 5, a fixed U-shaped bolt, 6, a guide rail, 7, a VID-3D measuring system, 8, a circular ring chain connecting clamp, 9, an S-shaped tension sensor, 10, a transition shaft, 11, a combined bearing seat, 12, an angle sensor support, 13, an angle sensor, 14, a torsion motor, 15, a motor support, 16, a torque sensor, 17, a combined bearing, 18, a torsion load loading system support, 19, a flat ring, 20, a vertical ring, 21 and a connecting plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a tension-torsion composite fatigue testing device for a ring chain of a heavy-duty scraper conveyor comprises a frame, a torsion load loading system, a tension load loading system and a monitoring system;
the frame comprises a first frame unit 1, a second frame unit 3 and a third frame unit 18; the first frame unit 1 is used for supporting a hydraulic cylinder 2 for loading tensile load; the second frame unit is used for supporting the guide rail 6; the third frame unit 18 is used for supporting the torsion motor 14, the angle sensor support 12 and the combined bearing pedestal 10; the first rack unit 1, the second rack unit 3 and the third rack unit 18 are connected with each other sequentially through a connecting plate 21 on the side surface by virtue of threads;
the torsion load loading system comprises a torsion motor 14, a combined bearing 17, a combined bearing seat 11 and a circular chain connecting clamp 8, wherein the torsion motor is connected with a torsion load loading system rack 18 through a motor support 15, the motor is provided with two output shafts, one output shaft is connected with an angle sensor 13, the angle sensor 13 can realize real-time measurement of the torsion angle of the motor 14, the other output shaft is connected with a transition shaft 10 and a torque sensor 16 through a coupler, and the torque sensor can realize real-time measurement of the torque of the circular chain; the combined bearing 17 is connected with a frame of a torsional load loading system 18 through a combined bearing seat 11, the combined bearing 17 can bear the action of tensile load so as to prevent the torsional motor 14 from bearing the action of tensile force, and the transition shaft 10 passes through the combined bearing to be connected with the S-shaped tension sensor 9; the other end of the S-shaped tension sensor 9 is connected with the round-link chain connecting clamp 8, and the S-shaped tension sensor 9 can realize real-time measurement of dynamic tension borne by the round-link chain;
the tensile load loading system comprises a loading hydraulic cylinder 2, an anti-torsion slide block 4, a fixed U-shaped bolt 5 and a guide rail 6, wherein the hydraulic cylinder 2 is fixedly connected with the first rack unit 1 through threads; the anti-twist sliding block 4 is connected with a piston rod of the hydraulic cylinder 2 through threads, so that the transmission of tensile load is realized; the fixed U-shaped bolt 5 is connected with the anti-twisting slide block 4, so that the tensile load application of the round-link chain is realized; the anti-torsion sliding block 4 is fixed on the guide rail 6 and used for bearing the torsion load transmitted to the round-link chain and preventing the piston rod of the hydraulic cylinder 2 from bearing the torsion load; the guide rail 6 is fixed on the second rack unit through threaded connection;
the monitoring system comprises an S-shaped tension sensor 8, a torque sensor 16, an angle sensor 13, a computer and a VIC-3D measuring system 7, wherein,
the S-shaped tension sensor is arranged between the round-link chain connecting clamp and the transition shaft and is used for measuring the dynamic tension born by the round-link chain in real time;
the torsion sensor is arranged on an output shaft between the torsion driving device and the transition shaft and used for measuring the torque of the round-link chain in real time;
the angle sensor is arranged on an output shaft of the torsion driving device and used for measuring the torsion angle of the round-link chain in real time;
the controller is in signal connection with the S-shaped tension sensor, the torsion sensor and the angle sensor;
the VIC-3D measuring system 7 is used for acquiring a displacement field of the round-link chain during an experiment and monitoring crack initiation and expansion conditions of a flat ring and a vertical ring of the round-link chain during the experiment.
A test method of a tension-torsion composite fatigue test device of a circular chain of a heavy-duty scraper conveyor comprises the following steps:
(1) connecting the round-link chain at the fixed positions of the two ends, namely respectively connecting the fixed U-shaped bolt 5 with the round-link chain connecting clamp 8;
(2) the hydraulic cylinder 2 is controlled by the controller to apply preset initial tension to the round-link chain;
(3) zeroing the S-shaped tension sensor 9, the torque sensor 16 and the angle sensor 13, and starting the VIC-3D measuring system 7;
(4) the hydraulic cylinder 2 and the torsion motor 14 are controlled by a computer to apply preset tensile and torsional fatigue loads to the round-link chain respectively, so that the time-varying tension, alternating torsional load and relative torsional motion of the round-link chain are simulated, and further, contact load is generated among chain links;
(5) acquiring and recording output signals of the sensor on a computer, and acquiring tensile and torsional loads borne by the round-link chain during an experiment;
(6) the displacement field of the circular ring during the experiment is obtained through the VIC-3D measuring system 7, the real-time strain and stress field of the circular ring chain can be further obtained by combining the material parameters of the circular ring chain, and the crack initiation and expansion conditions of the flat ring 19 and the vertical ring 20 of the circular ring chain in the experiment process are monitored;
(7) and performing linear cutting on the round-link chain after the experiment to obtain a sample at the contact position of the flat ring and the vertical ring, and obtaining the wear appearance of the round-link chain through the three-dimensional contourgraph so as to obtain the wear loss of the round-link chain.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. A tension-torsion composite fatigue test method of a ring chain of a heavy-duty scraper conveyor is based on a tension-torsion composite fatigue test device of the ring chain of the heavy-duty scraper conveyor and comprises a rack, a torsion load loading system, a tension load loading system and a monitoring system;
the frame comprises at least three frame units, namely a first frame unit, a second frame unit and a third frame unit, wherein the first frame unit is provided with a tensile load driving device for supporting and loading tensile load;
the second rack unit is used for supporting the fixed guide rail;
the third rack unit is used for supporting the torsion driving device, the angle sensor bracket and the combined bearing seat;
the first rack unit, the second rack unit and the third rack unit are connected and fixed through connecting pieces in sequence;
the torsion load loading system comprises a torsion driving device, a combined bearing seat and a circular chain connecting clamp, wherein the torsion driving device is connected with the third rack unit through a bracket, and an output shaft of the torsion driving device is connected with the transition shaft through a coupler;
the combined bearing is connected with the third rack unit through a combined bearing seat, and the transition shaft penetrates through the combined bearing to be connected with the tension sensor; the other end of the tension sensor is connected with the round-link chain connecting clamp;
the tensile load loading system comprises a tensile load driving device, an anti-torsion slide block, a fixed U-shaped bolt and a guide rail, wherein the tensile load driving device is fixed on the first rack unit through threaded connection; the anti-twist slide block is connected with a driving shaft of the tensile load driving device through threads, so that the transmission of tensile load is realized;
the fixed U-shaped bolt is connected with the anti-twisting slide block, so that the tensile load application of the round-link chain is realized;
the anti-torsion sliding block is arranged on the guide rail in a sliding mode and used for bearing the torsion load transmitted to the guide rail by the round-link chain and preventing a piston rod of the hydraulic cylinder from bearing the torsion load;
the monitoring system comprises a tension sensor, a torque sensor, an angle sensor, a controller and a non-contact strain measurement system, wherein,
the tension sensor is arranged between the round-link chain connecting clamp and the transition shaft and is used for measuring the dynamic tension born by the round-link chain in real time;
the torsion sensor is arranged on an output shaft between the torsion driving device and the transition shaft and used for measuring the torque of the round-link chain in real time;
the angle sensor is arranged on an output shaft of the torsion driving device and used for measuring the torsion angle of the round-link chain in real time;
the controller is in signal connection with the tension sensor, the torsion sensor and the angle sensor;
the non-contact strain measurement system is used for acquiring a displacement field of the round-link chain during an experiment and monitoring crack initiation and expansion conditions of a flat ring and a vertical ring of the round-link chain during the experiment;
the method is characterized by comprising the following steps:
step 1, connecting one end of a round-link chain with a round-link chain connecting clamp, and connecting the other end of the round-link chain with a fixed U-shaped bolt;
step 2, controlling a tensile load driving device through a controller to apply a preset initial tensile force to the round-link chain;
step 3, zeroing the tension sensor, the torque sensor and the angle sensor, and starting the non-contact strain measurement system;
step 4, controlling the tensile load driving device and the torsion driving device to apply preset tensile fatigue load and preset torsion fatigue load to the round-link chain through the controller;
step 5, collecting output signals of the tension sensor, the torque sensor and the angle sensor and recording the output signals on the controller;
step 6, acquiring a displacement field of the round-link chain during an experiment through a non-contact strain measurement system, and monitoring crack initiation and expansion conditions of a flat ring and a vertical ring of the round-link chain during the experiment;
step 7, performing line cutting on the tested round-link chain to obtain a sample at the contact position of the flat ring and the vertical ring, and obtaining the wear appearance of the round-link chain through a three-dimensional contourgraph so as to obtain the wear loss of the round-link chain;
the anti-torsion sliding block comprises a connecting plate and a vertical plate, wherein the connecting plate is horizontally arranged, the vertical plate is fixedly connected to the upper surface of the connecting plate, two ends of the bottom of the connecting plate, which are horizontally arranged, are respectively connected with the guide rail in a sliding mode through a sliding seat, and threaded holes used for being in threaded connection with a driving shaft of a tensile load driving device are formed in the vertical plate.
2. The tension-torsion composite fatigue testing method for the round-link chain of the heavy-duty scraper conveyor according to claim 1, wherein the combined bearing is a needle roller and thrust ball combined bearing.
3. The tension-torsion composite fatigue testing method for the round-link chain of the heavy-duty scraper conveyor according to claim 1, wherein the tensile load driving device is a hydraulic cylinder, the hydraulic cylinder is fixed on the first frame unit through threaded connection, and the torsion-proof slide block is connected with a piston rod of the hydraulic cylinder through threaded connection, so that the tensile load is transmitted.
4. The tension-torsion composite fatigue testing method for the round-link chain of the heavy-duty scraper conveyor according to claim 1, wherein the torsion driving device is a torsion motor, the torsion motor is provided with two output shafts, one of the output shafts is connected with the angle sensor, and the other output shaft is connected with the transition shaft through a coupler.
5. The tension-torsion composite fatigue testing method for the round-link chain of the heavy-duty scraper conveyor according to claim 1, wherein the controller is a computer.
6. The tension-torsion composite fatigue testing method for the round-link chain of the heavy-duty scraper conveyor according to claim 1, wherein the non-contact strain measuring system is a VIC-3D measuring system.
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| CN110779816A (en) * | 2019-11-12 | 2020-02-11 | 磐翼信息科技(上海)有限公司 | Detection device for detecting flexible pipeline |
| CN111693305A (en) * | 2020-05-25 | 2020-09-22 | 浙江美力汽车弹簧有限公司 | Stabilizer bar durability test device and test method |
| CN117606935B (en) * | 2024-01-23 | 2024-03-29 | 深圳市爱得乐电子有限公司 | Detection device of connector |
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