A full life cycle tensile test system of a scraper chain of a mine scraper conveyor and a test method thereof

Abstract

The present application relates to a kind of mining scraper conveyor scraper chain full life cycle tensile test system and its testing method, belong to the testing field of mining equipment parts. Including rack, tensile load loading system, material load loading system and monitoring system;Rack includes mainframe and camera rack, camera rack is used to support various cameras;Tensile load loading system is used to straighten the chain of chain transmission system and apply dynamic tension to chain;Material load loading system is used to simulate the force of material particles in the middle trough when moving to chain transmission system;Monitoring system is used to control the input to tensile load loading system and material load loading system, and the change of scraper, chain is tracked and recorded by camera throughout life cycle.The present application can realize the full life cycle tensile test of multiple kinds of scraper chain in multiple conditions, obtain more realistic signal data, for the life prediction of scraper chain.

Description

Technical Field

[0001] This invention relates to a full-life-cycle tensile testing system and method for scraper chains in mining scraper conveyors, belonging to the technical field of testing components for mining equipment. Background Technology

[0002] Scraper conveyors are the sole coal conveying equipment in fully mechanized coal mining faces. Due to their advantages such as long conveying distance, large conveying capacity, simple structure, convenient maintenance, and small footprint, they are widely used in chemical, metallurgical, and agricultural fields. With technological advancements, coal mining faces can reach 400m or even longer. If a scraper conveyor malfunctions and causes a production stoppage, it will result in significant economic losses. Therefore, obtaining full life-cycle data for scraper conveyor components, monitoring their health, and implementing planned downtime maintenance can prevent substantial losses.

[0003] The chain drive system is one of the most important subsystems of a scraper conveyor. Based on the chain arrangement, it can be divided into single-chain, double-chain, and double-chain chain drive systems. Different chain drive systems play important roles in their respective fields. This system mainly consists of a chain (composed of chain links with flat links 15 and vertical links 14), sprockets, scrapers 17, and a central trough 18. The chain is fixedly connected to the scrapers. Chain links are the most numerous parts, numbering in the thousands. Chain links must be replaced when their elongation reaches 3% during operation. Statistics show that 41.5% of scraper conveyor downtime is caused by chain breakage. Furthermore, the ends of the scrapers can wear down due to friction with the central trough caused by vibration, leading to shortening and a decrease in conveying efficiency. The scrapers can also bend horizontally due to load forces; when the bending reaches 5mm, they must be replaced. In coal conveying, the chain is mainly subjected to tensile force in the direction of travel. In addition, the coal material being transported has different particle sizes, which may cause the chain drive system to be affected by off-center loading. Furthermore, the material will vibrate due to fluctuations during transport. This vibration is transmitted to the chain links through the scraper, which is one of the reasons for the vibration of the chain links and cannot be ignored. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a full-life-cycle tensile testing system and method for scraper chains in mining scraper conveyors. This system enables full-life-cycle tensile testing of various types of scraper chains under multiple working conditions, obtaining more realistic signal data for scraper chain life prediction.

[0005] The technical solution of the present invention is as follows:

[0006] A full-life-cycle tensile testing system for scraper chains of mining scraper conveyors includes a frame, a tensile load loading system, a material load loading system, and a monitoring system.

[0007] The frame includes a main frame and a camera frame. The main frame is a rectangular frame that forms the outer contour of the invention. Several fixed crossbars are provided at the bottom of the main frame. The fixed crossbars are fixedly connected to the bottom of the central groove with bolts. The camera frame is used to support various types of cameras.

[0008] The tensile load loading system is used to straighten the chain of the chain drive system and apply dynamic tension to the chain;

[0009] The material load loading system is used to apply the chain drive system to both sides of the scraper, causing the scraper to swing in the middle trough, which is used to simulate the force exerted on the chain drive system by material particles when they move in the middle trough.

[0010] The monitoring system includes a controller and a camera, which are connected. The monitoring system is used to control the input to the tensile load loading system and the material load loading system, and to track and record the changes of the scraper and chain throughout their entire life cycle through the camera.

[0011] Preferably, the tensile load loading system includes a tensile electric cylinder, a guide slide rail, a guide slider, a tensile slide rail, a slider A, a lifting ring, a hook, a chain clamp, and a slide rail;

[0012] The bottom of the stretching electric cylinder is fixedly connected to the main frame. The end of the telescopic rod of the stretching electric cylinder is hinged to the pin of the stretching slide rail. There are two guide slide rails, which are respectively set on both sides of the main frame. The guide slider is fixedly installed at both ends of the stretching slide rail. The guide slider cooperates with the guide slide rail and can move up and down and be fixed on the guide slide rail. The stretching electric cylinder controls the extension and retraction of the telescopic rod. Through the cooperation of the guide slider and the guide slide rail, the stretching slide rail can drive the chain to straighten.

[0013] There is a guide slider on each of the left and right sides of the stretch slide rail, and two guide slide rails on the inner side of the main frame are fixedly connected to it. The guide sliders can slide on the guide slide rails and play a guiding role for the stretch slide rail.

[0014] The tension slide rail has sliders A on its internal track. The number of sliders A is the number of chains in the chain drive system. When a single chain drive system is subjected to a tensile test, there is one slider A, located in the middle of the groove of the tension slide rail. When a double chain drive system is subjected to a tensile test, there are two sliders A. The relative distance between the two sliders A can be controlled to accommodate different spacing between the two chains (when the two chains are at the two ends of the scraper, it is a side double chain drive system).

[0015] The slider A is threadedly connected with a lifting ring, the lifting ring is connected with a lifting hook, the lifting hook can cooperate with the lifting ring to transmit tensile force, the lifting hook is connected with a chain link fixture through an S-type tension sensor, the chain link fixture is used for connecting one end of a chain to be tested, the other end of the chain is connected with a slider B through the lifting hook, the slider B is matched with a slide rail and can slide and be fixed in the slide rail; the chain link fixture is used for being connected with a chain link of the chain transmission system to transmit tensile force; the number of the slider B is one or two to adapt to different types of chain transmission systems.

[0016] The stretching electric cylinder is in signal connection with a controller, the controller is a computer, and is used for controlling the extension and retraction of the stretching electric cylinder to apply dynamic tension to the chain; the S-type tension sensor is connected with the computer, and is used for monitoring the real-time tension between the chain links.

[0017] Preferably, the number of chains of the chain transmission system is one strand or two strands.

[0018] When testing a single-strand chain transmission system, there is one strand of chain, and when testing a double-strand chain transmission system, there are two strands of chain. Both the single-strand and double-strand chain transmission systems are provided with one scraper and one middle trough, and the chain transmission system can be replaced according to test requirements.

[0019] Preferably, the material load loading system includes a material electric cylinder, a material slider, a material slide rail and a push rod, the material slide rail is fixed on the main frame and suspended above the chain, the material slide rail is matched with the material slider, the material slider is fixedly connected with the material electric cylinder, the number of the material slider and the number of the material electric cylinder are both two, the end of the telescopic rod of the material electric cylinder is fixedly connected with the push rod by bolts and nuts, the push rod is fixedly connected with both sides of the scraper, the thrust generated by the material electric cylinder is transmitted to the scraper through the push rod, the material electric cylinder is in signal connection with the controller, the controller controls the extension and retraction of the material electric cylinder to apply acting force on both sides of the scraper, so that the scraper swings in the middle trough, and further the scraper and the chain links generate vibration.

[0020] Preferably, two camera frame slide rails are arranged on both sides of the main frame, the camera frame is in a several-shape, a protruding rod is arranged in the middle of the several-shaped structure, and the end of the camera frame is sleeved on the camera frame slide rails and can move;

[0021] The cameras include a bending degree camera, an elongation camera and a scraper wear camera, the bending degree camera is arranged on the protruding rod, and the bending degree camera is located directly in front of the scraper, for monitoring the bending degree of the scraper in real time;

[0022] The elongation cameras are arranged on the several-shaped structure, the number of the elongation cameras is the same as the number of chains (one is enough when performing a tensile test on a single-strand chain transmission system), and the elongation cameras are located directly above the vertical links of the chains, for monitoring the length information of the chain links in real time;

[0023] The scraper wear camera is mounted on the slide rail and is used to record the length m (since the scraper has a symmetrical structure, m has two values) between the end position of the scraper and the upper edge of the central groove, which is the scraper wear rate. As the scraper wears, m will gradually decrease.

[0024] Preferably, the curvature of the scraper is the length l between the curved scraper shape and the original scraper shape at the midpoint.

[0025] The elongation camera can obtain the original length n and real-time length n1 of the standing ring, and the elongation rate = n1 / n.

[0026] When it is a double-chain drive system, the elongation of the two chain links can be obtained and transmitted to the computer, which then calculates the corresponding elongation rate.

[0027] Preferably, the bending and elongation cameras are provided with through holes, and the extension rod and the Z-shaped structure are each provided with multiple threaded holes. The bending and elongation cameras are movable, respectively adapted to different chain spacings and to different widths of the central slot. The camera frame is used to mount and fix various cameras. The camera frame slide rail is slidably connected to the camera frame, allowing the camera frame to be positioned in different locations to adapt to measurement needs.

[0028] Preferably, the stretching slide rail, the material slide rail, and the slide rail are all groove-shaped, and the slider A, the material slider, and the slider B are all T-shaped structures. The T-shaped structure is embedded in the groove and can slide freely in the groove. An electric push rod is embedded in the T-shape. The extension and retraction of the electric push rod are controlled by toggling the locking switch (toggling the locking switch makes the electric push rod work, the electric push rod extends, and then fixes the slider on the slide rail).

[0029] Preferably, a distance sensor is provided at both ends of the stretching slide rail and the material slide rail. The distance sensor is connected to a computer and is used to control the spacing between the two chains.

[0030] A test method for the above-mentioned life-cycle tensile testing system for the scraper chain of a mining scraper conveyor includes the following steps:

[0031] S1: Select an appropriate chain link length so that the scraper is close to the middle position of the central groove. Install one end of the chain of the chain drive system to be tested on the chain link clamp, and connect the other end to the slider B through the hook. Connect the push rod to both sides of the scraper by adjusting the telescopic rod of the material electric cylinder. Fix the central groove to the fixed crossbar with bolts.

[0032] S2: Move the positions of sliders A and B by arranging the chains and lock them in place so that the distance between the two chains is consistent with the chain drive system; move the material slider to change the position of the force exerted by the push rod on the scraper and lock it in place so that the position of the material slider corresponds to the position of the scraper end.

[0033] S3: According to the analysis, the motion of the chain link under the actual working conditions conforms to simple harmonic motion x=x0+A sin(ωt). First, control the tension electric cylinder to give the chain an initial position x0, so that the chain is straightened. Then, according to the test requirements, give the extension rod amplitude A and frequency f=ω / (2π) of the tension electric cylinder to generate simple harmonic motion and apply the required dynamic tension to the chain.

[0034] S4: Because the movement of material in the central trough is random, the vibration transmitted to the scraper is unpredictable. Therefore, the user can control the extension and retraction time interval and amplitude of the two material electric cylinders via computer to make the scraper swing, which is used to simulate the force exerted on the chain links by material particles moving in the central trough, according to the actual situation and testing requirements.

[0035] When it is necessary to simulate vibration under eccentric load conditions, the two material electric cylinders need to be extended to different lengths in the initial state, so that the scraper is tilted on the surface of the middle trough. Then, the two material electric cylinders are randomly extended and retracted to make the scraper vibrate.

[0036] S5: Real-time acquisition of signals from S-shaped tension sensor and camera, and computer analysis to determine scraper bending degree, chain link elongation rate, scraper end position and scraper wear rate;

[0037] S6: When the elongation of the chain link reaches 3% or the bending of the scraper reaches 5mm, the computer will control the machine to stop and prompt the user on the computer screen whether to continue the test, in order to predict the life of the scraper chain.

[0038] The cameras used in this invention are all monocular CCD cameras. The technology for measuring length, curvature, and cracks is existing technology and has been applied and researched in other industries and fields. The camera is connected to a computer; the camera is responsible for acquiring image information, and the computer is responsible for processing the images to calculate length, curvature, and cracks. The camera acquires image information once per second, and the computer processes the image information to obtain length, curvature, and crack information. Because the scraper and chain links are constantly vibrating, their relative positions with the camera fluctuate, and the measured image information may not always be accurate. Therefore, the maximum value of the length, curvature, and crack information obtained every ten seconds is taken as the output value. The changes throughout the entire life cycle of the scraper and chain links are tracked and recorded.

[0039] The principle of length detection: Based on the principle of similar triangles, the distance from the camera to the object being detected and the focal length of the camera are known. The image captured by the camera is transmitted to the computer, and the size of the image displayed on the computer is also known. Therefore, the actual image size can be obtained.

[0040] The principle of curvature detection is as follows: acquire an image of the scraper surface, perform edge detection on the image to obtain the contour of the scraper surface, perform curve fitting on the contour to obtain the curve equation of the object surface, and calculate the curvature of the object based on the curve equation.

[0041] The principle of crack detection: Images of the scraper and the vertical ring are acquired once per second and transmitted to the computer. A trained classifier model is used to detect cracks in the images, marking the cracked areas. Tracking algorithms such as Kalman filters and particle filters are used to track the cracks. The changes in the cracks are analyzed by calculating indicators such as the length, width, and shape of the cracks.

[0042] This invention conducts full-lifecycle tensile tests on chain links and scrapers of different types of chain drive systems under normal and off-center load conditions to obtain more realistic data on chain dynamic tension, chain link elongation, scraper wear rate, scraper bending degree, and the crack initiation and propagation of chain links and scrapers observed by camera. This data is of great significance for the reliability of scraper conveyors and the prediction of the full lifecycle of chain links (during the test, if the chain link elongates by 3% or the scraper bending degree reaches 5mm, the part is considered to have reached the scrap standard).

[0043] For any details not covered in this invention, please refer to the prior art.

[0044] The beneficial effects of this invention are as follows:

[0045] This invention simulates the simple harmonic motion in the stretching direction and the vibration of the material on the scraper to more realistically reproduce the coal conveying conditions and obtain more authentic signals.

[0046] This invention can perform tensile tests on different types of chain drive systems and has a wide range of applications;

[0047] This invention can perform life tensile tests on chains under normal working conditions and off-center load conditions under different motion conditions and scraper vibration conditions, simulating multiple working conditions;

[0048] This invention enables precise control of the spacing between two chains during experiments using a ranging sensor.

[0049] In response to the difficulty in obtaining full lifecycle data of scraper chains, this invention can obtain the elongation rate of chain links, wear rate of scrapers, bending degree of scrapers, and crack initiation and propagation of scrapers and chain links throughout the entire lifecycle. This data support is of great significance for predicting the lifespan and maintaining the health of chain links and scrapers. Attached Figure Description

[0050] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0051] Figure 1 This is a schematic diagram of the structure of the double-chain drive system during tensile testing according to the present invention;

[0052] Figure 2 This is a top view of the tensile test performed on the double-chain drive system according to the present invention;

[0053] Figure 3 This is a partial enlarged view of the tension slide rail portion of the tension load loading system of the present invention;

[0054] Figure 4 This is a schematic diagram of the material load loading system of the present invention;

[0055] Figure 5 This is a schematic diagram of the slider A structure of the present invention;

[0056] Figure 6 This is a schematic diagram for calculating elongation.

[0057] Figure 7 This is a schematic diagram showing the monitoring of wear on the right-side scraper by the camera.

[0058] Figure 8 This is a schematic diagram of the camera frame position according to the present invention;

[0059] Figure 9 This is a schematic diagram illustrating the curvature calculation of the present invention;

[0060] In the diagram, 1-Main frame, 2-Extension electric cylinder, 3-Guide slide rail, 4-Extension slide rail, 5-Slider A, 6-Lifting ring, 7-Hook, 8-S-shaped tension sensor, 9-Chain link clamp, 10-Material slide rail, 11-Material slider, 12-Material electric cylinder, 13-Push rod, 14-Vertical ring, 15-Flat ring, 16-Slide rail, 17-Scraper, 18-Central groove, 19-Guide slider, 20-Pin, 21-Nut, 22-Bolt, 23-Camera frame, 24-Camera frame slide rail, 25-Bending camera, 26-Elongation camera, 27-Scraper wear camera, 28-Fixed crossbar, 29-Lock switch, 30-Extending rod, 31-Distance sensor, 32-Upper edge of central groove, 33-Scraper end position, 34-Slider B. Detailed Implementation

[0061] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. However, this is not the only description; all aspects not described in detail herein are based on conventional techniques in the art.

[0062] Example 1

[0063] A life-cycle tensile testing system for scraper chains in mining scraper conveyors, such as... Figures 1-9 As shown, it includes a frame, a tensile load loading system, a material load loading system, and a monitoring system;

[0064] The frame includes a main frame 1 and a camera frame 23. The main frame 1 is a rectangular frame that forms the outer contour of the invention. Three fixed crossbars 28 are provided at the bottom of the main frame 1. The fixed crossbars 28 are fixedly connected to the bottom of the central groove 18 by bolts. The camera frame 23 is used to support various cameras.

[0065] Tensile load loading systems are used to straighten the chains in chain drive systems and apply dynamic tension to the chains;

[0066] The material load loading system is used to apply the chain drive system to both sides of the scraper 17, causing the scraper 17 to swing in the middle trough, which is used to simulate the force exerted on the chain drive system by the material particles when they move in the middle trough.

[0067] The monitoring system includes a controller and a camera, which are connected. The monitoring system is used to control the input to the tensile load loading system and the material load loading system, and to track and record the changes of the scraper and chain throughout their entire life cycle through the camera.

[0068] Example 2

[0069] A full life cycle tensile testing system for scraper chains of a mining scraper conveyor, as described in Example 1, except that the tensile load loading system includes a tensile electric cylinder 2, a guide slide rail 3, a guide slider 19, a tensile slide rail 4, a slider A5, a lifting ring 6, a lifting hook 7, a chain link clamp 9, and a slide rail 16.

[0070] The bottom of the electric tension cylinder 2 is fixedly connected to the main frame 1. The end of the telescopic rod of the electric tension cylinder 2 is hinged to the tension slide rail pin. There are two guide slide rails 3, which are respectively set on both sides of the main frame 1. The guide slider 19 is fixedly installed at both ends of the tension slide rail. The guide slider 19 cooperates with the guide slide rail 3 and can move up and down and be fixed on the guide slide rail 3. The electric tension cylinder 2 controls the extension and retraction of the telescopic rod. Through the cooperation of the guide slider 19 and the guide slide rail 3, the tension slide rail can drive the chain to straighten.

[0071] There is a guide slider 19 fixedly connected to each of the left and right sides of the stretch slide rail 4. There are two guide slide rails 3 fixedly connected to the inner side of the main frame 1. The guide slider 19 can slide on the guide slide rail 3 and play a guiding role for the stretch slide rail.

[0072] Slider A5 is set on the inner track of the tension slide rail 4. The number of sliders A5 is the number of chains in the chain drive system. When a single chain drive system is subjected to a tensile test, there is one slider A, located in the middle of the groove of the tension slide rail. When a double chain drive system is subjected to a tensile test, there are two sliders A. The relative distance between the two sliders A can be controlled to adapt to different spacing between the two chains (when the two chains are at the two ends of the scraper, it is a side double chain drive system).

[0073] The slider A5 is threadedly connected to the lifting ring 6, which is connected to the hook 7. The hook 7 can cooperate with the lifting ring to transmit tension. The hook 7 is connected to the chain link clamp 9 through the S-type tension sensor 8. The chain link clamp 9 is used to connect one end of the chain to be tested. The other end of the chain is connected to the slider B 34 through the hook. The slider B 34 cooperates with the slide rail 16 and can slide and be fixed in the slide rail. The chain link clamp is connected to the vertical ring through the pin 20 to connect with the chain link of the chain drive system to transmit tension. The number of sliders B 34 is one or two to adapt to different types of chain drive systems.

[0074] The tension electric cylinder 2 is connected to the controller signal, which is a computer used to control the extension and retraction of the tension electric cylinder to apply dynamic tension to the chain; the S-type tension sensor 8 is connected to the computer to monitor the real-time tension between the chain links.

[0075] Example 3

[0076] A full-life-cycle tensile testing system for scraper chains in mining scraper conveyors, as described in Example 2, except that the number of chains in the chain drive system is one or two.

[0077] When testing a single-chain drive system, there is one chain; when testing a double-chain drive system, there are two chains. Both single-chain and double-chain drive systems have a scraper and a central groove. The chain drive system can be replaced according to the testing requirements.

[0078] Example 4

[0079] A full-life-cycle tensile test system for the scraper chain of a mining scraper conveyor, as described in Embodiment 3, differs in that the material load loading system includes a material electric cylinder 12, a material slider 10, a material slide rail 11, and a push rod 13. The material slide rail 11 is fixed to the main frame 1 and suspended above the chain. The material slide rail 10 is fitted with the material slider 11, and the material slider 11 is fixedly connected to the material electric cylinder 12. The number of the material sliders and the material electric cylinders is both two. The end of the telescopic rod of the material electric cylinder 12 is fixedly connected to the push rod 13 by a bolt 22 and a nut 21, and the push rod 13 is fixedly connected to both sides of the scraper. The thrust generated by the material electric cylinder is transmitted to the scraper through the push rod. The material electric cylinder is in signal connection with the controller, and the controller controls the expansion and contraction of the material electric cylinder to apply force to both sides of the scraper, so that the scraper swings in the middle trough, and further the scraper and the chain link generate vibration.

[0080] Embodiment 5

[0081] A full-life-cycle tensile test system for the scraper chain of a mining scraper conveyor, as described in Embodiment 4, differs in that two camera frame slide rails 24 are provided on both sides of the main frame 1. The camera frame 23 is in a zigzag shape, and a protruding rod 30 is provided in the middle of the zigzag structure. The end of the camera frame 23 is sleeved on the camera frame slide rail and can move;

[0082] The cameras include a bending degree camera 25, an elongation camera 26, and a scraper wear camera 27. The bending degree camera 25 is arranged on the protruding rod 30, and the bending degree camera 25 is located on the square side of the scraper, for monitoring the bending degree of the scraper in real time;

[0083] The elongation camera 26 is arranged on the zigzag structure, and the number of the elongation cameras is the same as the number of chains (only one is needed when performing a tensile test on a single-chain transmission system). The elongation camera is located directly above the chain vertical ring 14, for monitoring the length information of the chain link in real time;

[0084] As Figure 7 shown, the scraper wear camera 27 is arranged on the slide rail 16, for recording the length m between the scraper end position 33 and the upper edge 32 of the middle trough (since the scraper is a symmetrical structure, m has two values, which are m1 and m2 respectively), that is, the wear rate of the scraper. As the scraper wears, m will gradually decrease.

[0085] As Figure 9 shown, when the scraper is not bent, the upper and lower edges are horizontal lines. With the force applied by the material electric cylinder 12, the scraper will bend as shown by the dotted line. The length l at the middle position between the bent shape of the scraper and the original shape is the bending degree. When the bending degree reaches 5mm, the scraper reaches the scrap standard and must be replaced.

[0086] As Figure 6The original length n and real-time length n1 of the vertical ring can be obtained through the elongation camera. The elongation rate = n1 / n, and n1 and n2 represent the real-time lengths of the two chains, respectively.

[0087] When it is a double-chain drive system, the elongation of the two chain links can be obtained and transmitted to the computer, which then calculates the corresponding elongation rate.

[0088] Example 6

[0089] A full-life-cycle tensile testing system for a mining scraper conveyor chain, as described in Example 5, differs in that the bending angle camera 25 and the elongation rate camera 26 are provided with through holes, and the extension rod and the Z-shaped structure are each provided with multiple threaded holes. The bending angle camera 25 and the elongation rate camera 26 are movable, respectively used to accommodate different chain spacings and to adapt to different widths of the central groove. A camera frame is used to mount and fix various cameras. The camera frame slide rail is slidably connected to the camera frame, allowing the camera frame to be positioned in different locations to adapt to measurement needs.

[0090] Example 7

[0091] A full-life-cycle tensile testing system for a scraper conveyor in mining is described in Example 6, except that the tensile slide rail 4, material slide rail 10, and slide rail 16 are all groove-shaped, and the slider A5, material slider 11, and slider B34 are all T-shaped structures. The T-shaped structure is embedded in the groove and can slide freely in the groove. An electric push rod is embedded in the T-shape. The extension and retraction of the electric push rod are controlled by toggling the locking switch 29 (toggling the locking switch makes the electric push rod work, the electric push rod extends, and then fixes the slider on the slide rail).

[0092] Example 8

[0093] A full life cycle tensile testing system for a scraper chain of a mining scraper conveyor, as described in Example 7, is provided, except that a distance sensor 31 is provided at both ends of the tensile slide rail and the material slide rail. The distance sensor 31 is connected to a computer and is used to control the spacing between the two chains.

[0094] Example 9

[0095] A test method for a full-life-cycle tensile testing system for scraper chains in mining scraper conveyors includes the following steps:

[0096] S1: Select an appropriate chain link length so that the scraper is close to the middle position of the central groove. Install one end of the chain of the chain drive system to be tested on the chain link clamp 9, and connect the other end to the slider B 34 through the hook. Connect the push rod 13 to both sides of the scraper by adjusting the telescopic rod of the material electric cylinder 12. Fix the central groove to the fixed crossbar with bolts.

[0097] S2: Move the positions of sliders A5 and B34 by arranging the chains and lock them in place so that the distance between the two chains is consistent with the chain drive system; move the material slider to change the position of the force exerted by the push rod on the scraper and lock it in place so that the position of the material slider corresponds to the position of the scraper end.

[0098] S3: According to the analysis, the motion of the chain link under the actual working conditions conforms to simple harmonic motion x=x0+A sin(ωt). First, control the tension electric cylinder 2 to give the chain an initial position x0, so that the chain is straightened. Then, according to the test requirements, the amplitude A and frequency f=ω / (2π) of the extension rod of the tension electric cylinder 2 are given to generate simple harmonic motion and apply the required dynamic tension to the chain.

[0099] S4: Because the movement of material in the middle trough is random, the vibration transmitted to the scraper is unpredictable. Therefore, the user can control the extension and retraction time interval and amplitude of the two material electric cylinders 12 via computer to make the scraper swing, which is used to simulate the force exerted on the chain link by the material particles when moving in the middle trough, according to the actual situation and test requirements.

[0100] When it is necessary to simulate vibration under eccentric load conditions, the two material electric cylinders 12 need to extend to different lengths in the initial state, so that the scraper is tilted on the surface of the middle trough. Then, the two material electric cylinders are randomly extended and retracted to make the scraper vibrate.

[0101] S5: Real-time acquisition of signals from S-type tension sensor 8 and camera, and computer analysis to determine the scraper's curvature, chain link elongation, scraper end position, and scraper wear rate.

[0102] S6: When the elongation of the chain link reaches 3% or the bending of the scraper reaches 5mm, the computer will control the machine to stop and prompt the user on the computer screen whether to continue the test, in order to predict the life of the scraper chain.

[0103] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A full-life-cycle tensile testing system for scraper chains in mining scraper conveyors, characterized in that, comprising a frame, a tensile load loading system, a material load loading system and a monitoring system; The frame includes a main frame and a camera frame. The main frame is a rectangular frame, a plurality of fixed crossbars are arranged at the lower part of the main frame, and the fixed crossbars are fixedly connected with the bottom of the middle trough by bolts; the camera frame is used for supporting various types of cameras; The tensile load loading system is used for straightening the chain of the chain transmission system and applying dynamic tension to the chain; The material load loading system is used for acting on both sides of the scraper via the chain transmission system, causing the scraper to swing in the middle trough, so as to simulate the acting force exerted on the chain transmission system when material particles move in the middle trough; The monitoring system includes a controller and cameras, the controller is connected with the cameras, and the monitoring system is used for controlling the inputs to the tensile load loading system and the material load loading system, and tracking and recording the full-life-cycle changes of the scraper and the chain through the cameras; The tensile load loading system includes a stretching electric cylinder, guide slide rails, guide sliders, a stretching slide rail, slider A, lifting rings, lifting hooks, chain link fixtures and a slide rail; The bottom of the stretching electric cylinder is fixedly connected with the main frame, the end of the telescopic rod of the stretching electric cylinder is pin-jointed with the stretching slide rail, the number of the guide slide rails is two, which are respectively arranged on both sides of the main frame, the guide sliders are fixedly installed at both ends of the stretching slide rail, and the guide sliders are matched with the guide slide rails, and can move up and down and be fixed on the guide slide rails; Slider A is arranged on the inner track of the stretching slide rail, the number of slider A is equal to the number of chains in the chain transmission system, the slider A is connected with a lifting ring, the lifting ring is connected with a lifting hook, the lifting hook is connected with a chain link fixture through an S-type tension sensor, the chain link fixture is used for connecting one end of the chain to be tested, the other end of the chain is connected with slider B through a lifting hook, and the slider B is matched with the slide rail, and can slide and be fixed in the slide rail; The stretching electric cylinder is in signal connection with the controller, the controller is a computer, which is used for controlling the extension and retraction of the stretching electric cylinder to apply dynamic tension to the chain; the S-type tension sensor is connected with the computer, for monitoring the real-time tension between chain links; The material load loading system includes material electric cylinders, material sliders, material slide rails and push rods, the material slide rails are fixed on the main frame and suspended above the chain, the material slide rails are matched with the material sliders, the material sliders are fixedly connected with the material electric cylinders, the number of the material sliders and the number of the material electric cylinders are both two, the end of the telescopic rod of the material electric cylinder is fixedly connected with the push rod, the push rod is fixedly connected with both sides of the scraper, the material electric cylinder is in signal connection with the controller, and the controller controls the extension and retraction of the material electric cylinder to apply acting force to both sides of the scraper.

2. The full life cycle tensile testing system for scraper chains of mining scraper conveyors according to claim 1, characterized in that, The number of chains of the chain transmission system is one or two.

3. The full life cycle tensile testing system for scraper chains of mining scraper conveyors according to claim 2, characterized in that, Two camera frame slide rails are arranged on both sides of the main frame, the camera frame is in a shape of a Chinese character "几", a protruding rod is arranged in the middle of the "几"-shaped structure, and the end of the camera frame is sleeved on the camera frame slide rails and can move; The cameras include a curvature camera, an elongation camera and a scraper wear camera, the curvature camera is arranged on the protruding rod, the curvature camera is located above the scraper, for monitoring the curvature of the scraper in real time; The elongation cameras are mounted on the U-shaped structure. The number of elongation cameras is the same as the number of chains. The elongation cameras are located directly above the chains and are used to monitor the length information of the chain links in real time. The scraper wear camera is mounted on the slide rail and is used to record the length between the end position of the scraper and the upper edge of the central groove, i.e., the wear rate of the scraper.

4. The full life cycle tensile testing system for scraper chains of mining scraper conveyors according to claim 3, characterized in that, The curvature of the scraper is the length of the scraper after bending, relative to the original scraper shape, at the midpoint. l It refers to the curvature; The elongation camera can obtain the original length n and real-time length n1 of the standing ring, and the elongation rate = n1 / n.

5. The full-life-cycle tensile testing system for scraper chains in mining scraper conveyors according to claim 4, characterized in that, The bending and elongation cameras are equipped with through holes, and the extension rod and the Z-shaped structure are equipped with multiple threaded holes. The bending and elongation cameras are movable and are used to adapt to different chain spacings and to accommodate different widths of the central groove.

6. The full life cycle tensile testing system for scraper chains of mining scraper conveyors according to claim 5, characterized in that, The stretching slide rail, material slide rail, and slide rail are all groove-shaped. Slider A, material slider, and slider B are all T-shaped structures. The T-shaped structures are embedded in the grooves, and electric push rods are embedded in the T-shapes. The extension and retraction of the electric push rods are controlled by toggling the locking switch.

7. The full life cycle tensile testing system for scraper chains of mining scraper conveyors according to claim 6, characterized in that, Both ends of the stretching slide rail and the material slide rail are equipped with a distance sensor, which is connected to a computer to control the spacing between the two chains.

8. A test method for the full life cycle tensile testing system of the scraper chain of a mining scraper conveyor as described in claim 7, characterized in that... Includes the following steps: S1: Install one end of the chain of the chain drive system to be tested on the chain link clamp, and connect the other end to the slider B through the hook. Connect the push rod to the two sides of the scraper by adjusting the telescopic rod of the material electric cylinder. Fix the middle groove to the fixed crossbar with bolts. S2: Move the positions of sliders A and B by arranging the chains and lock them in place so that the distance between the two chains is consistent with the chain drive system; move the material slider and lock it in place so that the position of the material slider corresponds to the position of the scraper end. S3: First, control the tensioning electric cylinder to give the chain an initial position x0, straightening the chain. Then, according to the test requirements, specify the amplitude A and frequency of the extension rod of the tensioning electric cylinder. f= ω / (2 π This generates simple harmonic motion, applying the required dynamic tension to the chain; S4: The extension and retraction time interval and amplitude of the two material electric cylinders are controlled by computer to make the scraper swing, which is used to simulate the force of material particles on the chain links when moving in the middle trough. When it is necessary to simulate vibration under eccentric load conditions, the two material electric cylinders need to be extended to different lengths in the initial state, so that the scraper is tilted on the surface of the middle trough. Then, the two material electric cylinders are randomly extended and retracted to make the scraper vibrate. S5: Real-time acquisition of signals from S-shaped tension sensor and camera, and computer analysis to determine the scraper's curvature, chain link elongation, scraper end position, and scraper wear rate. S6: When the elongation of the chain link reaches 3% or the bending of the scraper reaches 5mm, the computer will control the machine to stop and prompt the user on the computer screen whether to continue the test, in order to predict the life of the scraper chain.

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