Straightness measuring device and straightness detecting method

Abstract

The invention provides a straightness measuring device and a straightness detection method, and relates to the technical field of mechanical measurement, the straightness measuring device comprises a scraper conveyor body, at least one group of tensioning devices arranged along the length direction of the scraper conveyor body, and a flexible structure arranged along the length direction of the scraper conveyor body, the length monitoring devices are arranged at the two ends of the flexible structure respectively; the two ends of the flexible structure are movably connected with a set of tensioning devices arranged in the length direction of the scraper conveyor body correspondingly so that the flexible structure can be tightly attached to the scraper conveyor body under the action of the tensioning devices. The length monitoring device is in contact connection with the flexible structure and is used for measuring the length change of the flexible structure. According to the implementation mode, the overall cost of working face straightness detection is reduced, meanwhile, the accuracy influence caused by dust particles can be avoided through the contact type measurement mode of the length monitoring device and the flexible structure, and the stability and accuracy of the measurement result are improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical measurement technology, and in particular to a straightness measuring device and a straightness detection method. Background Technology

[0002] To detect the straightness of the working face of a scraper conveyor, existing straightness measuring devices typically incorporate various detection equipment, such as fiber optic circulator arrays, lidar arrays, or inertial navigation modules, to measure straightness based on laser data or other data (e.g., inertial navigation data). These devices often require specific environmental conditions to achieve the required measurement accuracy. Dust particles generated during coal mining can severely interfere with the measurements, leading to poor accuracy. Furthermore, these devices are relatively expensive, significantly increasing the overall cost of coal mining. Summary of the Invention

[0003] This invention provides a straightness measuring device and a straightness detection method. By setting a flexible structure on the scraper conveyor body and setting a tensioning device, the flexible structure can be kept in close contact with the scraper conveyor body at all times. This allows for the detection of the straightness of the working surface of the scraper conveyor body based on the length change of the flexible structure. This not only reduces the overall cost of working surface straightness detection, but also avoids the impact of dust particles on accuracy due to the contact measurement method between the length monitoring device and the flexible structure, thus improving the stability and accuracy of the measurement results.

[0004] The present invention provides a straightness measuring device, comprising: a scraper conveyor body, at least one set of tensioning devices arranged along the length direction of the scraper conveyor body, a flexible structure arranged along the length direction of the scraper conveyor body, and length monitoring devices disposed at both ends of the flexible structure. Wherein, both ends of the flexible structure are respectively movably connected to a set of tensioning devices arranged along the length direction of the scraper conveyor body, so that the flexible structure is tightly attached to the scraper conveyor body under the action of the tensioning devices; The length monitoring device is connected in contact with the flexible structure and is used to measure the length change of the flexible structure.

[0005] Optionally, the flexible structure is positioned close to the scraper in the scraper conveyor body.

[0006] Optionally, the flexible structure is set close to the support column in the scraper conveyor body.

[0007] Optionally, when the flexible structure is set close to the support column in the scraper conveyor body, there are multiple flexible structures and multiple sets of tensioning devices; Each of the flexible structures is arranged in close proximity to multiple continuous support columns, and the multiple flexible structures are arranged sequentially along the length direction of the scraper conveyor body. Each of the tensioning devices is disposed at both ends of one of the flexible structures, and provides external force to the flexible structure when the tensioning device is in operation, so as to straighten the flexible structure.

[0008] Optionally, the flexible structure is disposed on the first side of the support column facing the scraper conveyor body and / or the second side of the support column facing away from the scraper conveyor body.

[0009] Optionally, when the flexible structure is arranged in close contact with the scraper in the scraper conveyor body, there is one flexible structure and one tensioning device. The tensioning device is located at both ends along the length of the scraper conveyor body.

[0010] Optionally, it also includes: mechanical sensors located at both ends of the flexible structure for measuring the tension force of the flexible structure.

[0011] Optionally, the length monitoring device is a rotary encoder; and / or, the flexible structure is a steel wire rope.

[0012] The present invention also provides a straightness detection method, implemented based on any of the straightness measuring devices described above, comprising: Step 1: Start the scraper conveyor body and use the length monitoring device to obtain the change in length of the flexible structure in real time; Step 2: In response to the change in length exceeding a preset threshold, an alarm message is sent to the operator of the straightness measuring device so that the operator can adjust the straightness measuring device.

[0013] Optionally, before step 1, the method further includes: Step 0: With the scraper conveyor body closed, obtain the initial length of the flexible structure; With multiple flexible structures respectively disposed on the first and second sides of the support column, Step 1 includes: obtaining the first sub-variable length of the flexible structure located on the first side and the second sub-variable length of the flexible structure located on the second side, respectively. Step 2 includes: Step 21: Calculate the total change length based on the first sub-change length, the initial length, and the second sub-change length; Step 22: In response to the total change length being greater than a preset threshold, an alarm message is sent to the operator of the straightness measuring device so that the operator can adjust the straightness measuring device.

[0014] Optionally, there are multiple preset thresholds, and each preset threshold corresponds to different alarm information.

[0015] This invention provides a straightness measuring device and a straightness detection method. By setting a flexible structure on the scraper conveyor body and installing a tensioning device, the flexible structure can be kept in a straight state and tightly attached to the scraper conveyor body. This allows for the detection of the straightness of the working surface of the scraper conveyor body based on the length change of the flexible structure. This not only reduces the overall cost of working surface straightness detection, but also avoids the impact of dust particles on accuracy due to the contact measurement method between the length monitoring device and the flexible structure, thus improving the stability and accuracy of the measurement results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a side view schematic diagram of the overall straightness measuring device provided by the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the straightness measuring device provided by the present invention.

[0019] Figure 3 This is one of the flowcharts illustrating the straightness detection method of the straightness measuring device provided by the present invention.

[0020] Figure label: 1-Scraper conveyor body; 11-Scraper; 12-Support column; 2-Tensioning device; 3-Flexible structure; 4-Length monitoring device. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] The following is combined with Figure 1 and Figure 2 The straightness measuring device of the present invention is described, wherein, Figure 1 This is a side view schematic diagram of the overall straightness measuring device provided by the present invention. Figure 2 This is a three-dimensional structural schematic diagram of the straightness measuring device provided in an embodiment of the present invention. Figure 1 As shown, the straightness measuring device provided by the present invention includes: a scraper conveyor body 1, at least one set of tensioning devices 2 arranged along the length direction of the scraper conveyor body 1, a flexible structure 3 arranged along the length direction of the scraper conveyor body 1, and length monitoring devices 4 respectively disposed at both ends of the flexible structure 3; wherein, both ends of the flexible structure 3 are movably connected to a set of tensioning devices 2 arranged along the length direction of the scraper conveyor body 1, so that the flexible structure 3 is tightly attached to the scraper conveyor body 1 under the action of the tensioning devices 2; the length monitoring devices 4 are in contact with the flexible structure 3 and are used to measure the length change of the flexible structure 3.

[0023] from Figure 1 As can be seen, by setting tensioning devices 2 at both ends of the flexible structure 3, the embodiments of the present invention can continuously provide external force to the flexible structure 3, keeping it in a taut state. This allows the length of the flexible structure 3 to change with the degree of bending deformation of the scraper conveyor body 1, thus enabling the monitoring of the straightness of the scraper conveyor body 1 based on the length of the flexible structure 3. Furthermore, by connecting the length monitoring device 4 to the flexible structure 3, the embodiments of the present invention can directly sense the length change of the flexible structure 3, rather than measuring straightness indirectly through light reflection as in existing technologies. This significantly improves the monitoring stability in harsh environments such as coal mining.

[0024] The flexible structure 3 can be a steel wire rope or a high-strength steel wire rope with a certain thickness, such as a diameter of 1cm to 2cm, for example, 1cm, 1.2cm, 1.5cm, 1.8cm, 2cm, etc. Steel wire ropes of this diameter typically possess a certain degree of rigidity. While meeting mine regulations, they can not only be used to measure the straightness of the working face but also provide gripping support for underground workers to assist them in walking, thereby improving walking safety. The length monitoring device 4 can be a rotary encoder. By rubbing the measuring wheel of the rotary encoder against the steel wire rope, the encoder rotates with the extension and retraction of the steel wire rope. By sending pulse signals at preset rotation angles and monitoring the number of pulse signals, the extension and retraction length of the steel wire rope can be determined, thus monitoring the length change of the flexible structure 3.

[0025] Regarding the specific placement of the flexible structure 3, in one optional embodiment, such as Figure 1 and Figure 2 As shown, the flexible structure 3 is set tightly against the scraper 11 in the scraper conveyor body 1. This is because, during operation, excessive bending of the scraper conveyor body 1 increases the running resistance and wear of the scraper chain, potentially leading to chain breakage. Therefore, the working face of the scraper 11 typically needs to meet the "three straight" requirements during fully mechanized mining: straight coal wall, straight scraper, and straight hydraulic support frame (support column 12). Moreover, the scraper conveyor is not only a coal conveying device but also the track for the coal mining machine. Therefore, poor straightness of the scraper conveyor can cause the coal mining machine to deviate from the track during operation, potentially leading to derailment, mechanical accidents, or personal injury. Therefore, in this embodiment of the invention, setting the flexible structure 3 tightly against the scraper 11 in the scraper conveyor body 1 allows for effective measurement of the straightness of the working face of the scraper 11. Specifically, the flexible structure 3 can be directly installed in the cable trough of the scraper 11, ensuring that the flexible structure 3 remains in close contact with the scraper 11 at all times, thereby allowing for the measurement of the straightness of the working face of the scraper 11.

[0026] In another alternative embodiment, such as Figure 2 As shown, the flexible structure 3 is set close to the support column 12 in the scraper conveyor body 1. Specifically, there is a mechanical structure, namely a pushing cylinder, that is fixedly connected between the support column 12 and the scraper 11. When the support column 12 shifts position, the scraper 11 will also shift position synchronously under the action of the pushing cylinder. Therefore, by setting the flexible structure 3 close to the support column 12, the straightness of the working surface of multiple support columns 12 can be measured, which can indirectly indicate the straightness of the working surface of the scraper 11.

[0027] Specifically, such as Figure 1 and Figure 2As shown, when the flexible structure 3 is set close to the scraper 11 in the scraper conveyor body 1, there is one flexible structure 3 and one tensioning device 2; wherein, the tensioning device 2 is located at both ends of the scraper conveyor body 1 along its length. That is to say, when the flexible structure 3 is set close to the scraper 11, since there is no additional space between the scraper 11 to set the tensioning device 2 and the length monitoring device 4, in this embodiment of the invention, the tensioning device 2 is set at both ends of the scraper conveyor body 1 along its length, and the wire rope (flexible structure 3) is stretched straight from beginning to end along the scraper conveyor body 1. In this way, when the scraper 11 is convex or concave, it will pull the wire rope, causing the length of the wire rope end to change. Thus, the length detection device 4 located at the end of the wire rope can detect the specific length of the wire rope stretching.

[0028] However, this arrangement, due to the presence of only one long steel wire rope, results in a relatively low sensitivity to deformation of the working surface of the scraper 11. In other words, when the deformation of the working surface of the scraper 11 is small, the change in the length of the steel wire rope will not be significant, leading to relatively low detection accuracy. Therefore, in this embodiment of the invention, multiple flexible structures 3 are preferably provided, one of which is closely attached to the scraper 11, while the others are closely attached to the support column 12.

[0029] Specifically, when the flexible structure 3 is set close to the support columns 12 in the scraper conveyor body 1, there are multiple flexible structures 3 and multiple sets of tensioning devices 2. Each flexible structure 3 is set close to multiple consecutive support columns 12, and the multiple flexible structures 3 are arranged sequentially along the length direction of the scraper conveyor body 1. Each set of tensioning devices 2 is set at both ends of a flexible structure 3, and provides external force to the flexible structure 3 when the tensioning device 2 is working to straighten the flexible structure 3. It can be understood that as the length of the scraper conveyor body 1 increases, the number of support columns 12 will also increase. Therefore, by setting multiple flexible structures 3 separately, and each flexible structure 3 is used to measure whether the working surface of multiple consecutive support columns 12 has changed, the detection accuracy will be higher than that of setting a complete long flexible structure 3 directly on the scraper conveyor body 1, and it will be easier to detect whether some support columns 12 have been displaced.

[0030] In further optional embodiments, such as Figure 2As shown, the flexible structures 3 are respectively disposed on the first side of the support column 12 facing the scraper conveyor body 1 and / or the second side of the support column 12 facing away from the scraper conveyor body 1. That is, the flexible structures 3 can be disposed only on one side of the support column 12, or they can be disposed on both sides of the support column 12. It is understood that when the flexible structures 3 are only disposed on the first side of the support column 12 facing the scraper conveyor body 1, the straightness of the working surface of the support column 12 protruding towards the scraper conveyor body 1 can only be measured, and the straightness of the working surface of the support column 12 concave towards the scraper conveyor body 1 cannot be measured. Therefore, in this embodiment of the invention, it is preferable to dispose of the flexible structures 3 on the first side of the support column 12 facing the scraper conveyor body 1 and the second side of the support column 12 facing away from the scraper conveyor body 1. In this case, the flexible structures 3 located on the first side and the flexible structures 3 located on the second side need to correspond one-to-one. As can be seen, by respectively setting multiple flexible structures 3 on two opposite sides of the support column 12, the displacement of the support column 12 towards the scraper 11 and the displacement away from the scraper 11 can be effectively measured, and more accurate measurement results can be obtained. For example, if there are n flexible structures 3 on the first side, there are also n flexible structures 3 on the second side, and the flexible structures 3 on both sides are correspondingly arranged. Alternatively, the flexible structure 3 can be fixed relative to each support column 12 by passing it through a fixing ring on the support column 12, so that the flexible structure 3 can synchronously change its length as the support column 12 moves towards or away from the scraper conveyor body 1.

[0031] In an optional embodiment, the straightness measuring device provided by the present invention further includes: mechanical sensors located at both ends of the flexible structure 3, used to measure the tension force of the flexible structure 3. The tension force characterizes whether the flexible structure 3 is under stress, ensuring that the flexible structure 3 is always in a straightened state. Only when the flexible structure 3 is always in a straightened state is the measurement result meaningful.

[0032] In summary, the straightness measuring device provided in this embodiment of the invention, by setting a flexible structure on the scraper conveyor body and setting a tensioning device, can ensure that the flexible structure is always in a straight state and closely attached to the scraper conveyor body. Thus, it can detect the straightness of the working surface of the scraper conveyor body based on the length change of the flexible structure. This not only reduces the overall cost of straightness detection of coal mine working faces, but also avoids the influence of dust particles on accuracy by using this contact measurement method between the length monitoring device and the flexible structure, thus improving the stability and accuracy of the measurement results.

[0033] This invention provides a straightness detection method, implemented using any of the aforementioned straightness measuring devices, specifically as follows: Figure 3 As shown, it includes: Step 301: Start the scraper conveyor body 1 and use the length monitoring device 4 to obtain the change in length of the flexible structure 3 in real time; Step 302: In response to the change in length exceeding a preset threshold, an alarm message is sent to the operator of the straightness measuring device so that the operator can adjust the straightness measuring device.

[0034] Among them, the length monitoring device 4 can be a rotary encoder. By rubbing the measuring wheel of the rotary encoder with the wire rope, the rotary encoder can rotate with the extension and retraction of the wire rope. Then, by sending pulse signals when rotating at a preset angle and monitoring the number of pulse signals, the extension and retraction length of the flexible structure 3 can be known, thereby monitoring the length change of the flexible structure 3.

[0035] Furthermore, the pulse signals sent by the rotary encoder can be transmitted to the surface / underground monitoring center via a mining CAN bus or a mining wireless sensor network, so that operators can observe the underground situation in real time at the monitoring center.

[0036] In an optional embodiment, before step 301, the method may further include: obtaining the initial length of the flexible structure 3 when the scraper conveyor body 1 is closed. When multiple flexible structures 3 are respectively installed on the first and second sides of the support column 12, step 301 further includes: obtaining the first sub-variable length of the flexible structure 3 located on the first side and the second sub-variable length of the flexible structure 3 located on the second side; step 302 further includes: calculating the total variable length based on the first sub-variable length, the initial length, and the second sub-variable length; and in response to the total variable length exceeding a preset threshold, sending an alarm message to the operator of the straightness measuring device to enable the operator to adjust the straightness measuring device.

[0037] In other words, when multiple flexible structures 3 are respectively installed on the first and second sides of the support column 12, the length changes of the flexible structures 3 on the first and second sides need to be measured separately to determine the total change length. For example, the length of the flexible structure 3 on the first side can be obtained first based on the difference between the first sub-change length and the initial length; the length of the flexible structure 3 on the second side can be obtained by the difference between the initial length and the second sub-change length; and the total change length can be obtained by subtracting the length of the flexible structure 3 on the second side from the length of the flexible structure 3 on the first side. Alternatively, the first and second sub-change lengths can be set to positive and negative values ​​respectively to calculate the total change length.

[0038] In a further optional embodiment, there are multiple preset thresholds, each corresponding to different alarm information. For example, depending on the severity level, there can be three preset thresholds, representing Level 1, Level 2, and Level 3, respectively, with corresponding alarm information of flashing yellow light, solid yellow light, and flashing red light with an audible alarm.

[0039] In one optional embodiment, after obtaining the changed length, the original collected data can be filtered (e.g., moving average filtering, Kalman filtering) to eliminate vibration noise, and the changed lengths detected by each length detection device 4 can be displayed on the topology map through a visualization window. All detection data needs to be stored so that it can be queried and traced back according to time or region, providing support for process optimization and accident investigation.

[0040] In summary, the straightness detection method of the straightness measuring device provided in this embodiment of the invention, by setting a flexible structure 3 on the scraper conveyor body 1 and setting a tensioning device, can ensure that the flexible structure 3 is always in a straight state and tightly attached to the scraper conveyor body 1 by using the tensioning device 2. Thus, the straightness of the working face of the scraper conveyor body 1 can be detected based on the length change of the flexible structure 3. This not only reduces the overall cost of straightness detection of coal mine working face, but also avoids the influence of dust particles on accuracy by using this contact measurement method between the length monitoring device 4 and the flexible structure 3, thus improving the stability and accuracy of the measurement results.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A straightness measuring device, characterized in that, include: The scraper conveyor body (1), at least one set of tensioning devices (2) arranged along the length direction of the scraper conveyor body (1), a flexible structure (3) arranged along the length direction of the scraper conveyor body (1), and length monitoring devices (4) respectively arranged at both ends of the flexible structure (3). Wherein, the two ends of the flexible structure (3) are respectively movably connected to a set of tensioning devices (2) arranged along the length direction of the scraper conveyor body (1), so that the flexible structure (3) is tightly attached to the scraper conveyor body (1) under the action of the tensioning devices (2); The length monitoring device (4) is in contact with the flexible structure (3) and is used to measure the length change of the flexible structure (3).

2. The straightness measuring device according to claim 1, characterized in that, The flexible structure (3) is set in close contact with the scraper (11) in the scraper conveyor body (1); And / or, The flexible structure (3) is set close to the support column (12) in the scraper conveyor body (1).

3. The straightness measuring device according to claim 2, characterized in that, When the flexible structure (3) is set close to the support column (12) in the scraper conveyor body (1), there are multiple flexible structures (3) and multiple sets of tensioning devices (2); Each of the flexible structures (3) is set close to multiple continuous support columns (12), and the multiple flexible structures (3) are set sequentially along the length direction of the scraper conveyor body (1). Each of the tensioning devices (2) is located at both ends of a flexible structure (3) and provides external force to the flexible structure (3) when the tensioning device (2) is working, so as to straighten the flexible structure (3).

4. The straightness measuring device according to claim 3, characterized in that, The flexible structure (3) is disposed on the first side of the support column (12) facing the scraper conveyor body (1) and / or the second side of the support column (12) facing away from the scraper conveyor body (1).

5. The straightness measuring device according to claim 2, characterized in that, When the flexible structure (3) is set close to the scraper (11) in the scraper conveyor body (1), the flexible structure (3) is one and the tensioning device (2) is a set; The tensioning device (2) is located at both ends of the scraper conveyor body (1) along its length.

6. The straightness measuring device according to claim 1, characterized in that, Also includes: The mechanical sensors located at both ends of the flexible structure (3) are used to measure the tension of the flexible structure (3).

7. The straightness measuring device according to claim 1, characterized in that, The length monitoring device (4) is a rotary encoder; And / or, The flexible structure (3) is a steel wire rope.

8. A method for detecting straightness, characterized in that, Based on the straightness measuring device according to any one of claims 1 to 7, including: Step 1: Start the scraper conveyor body (1) and use the length monitoring device (4) to obtain the change in length of the flexible structure (3) in real time; Step 2: In response to the change in length exceeding a preset threshold, an alarm message is sent to the operator of the straightness measuring device so that the operator can adjust the straightness measuring device.

9. The straightness detection method according to claim 8, characterized in that, Before step 1, the following is also included: Step 0: With the scraper conveyor body (1) closed, obtain the initial length of the flexible structure (3); When multiple flexible structures (3) are respectively arranged on the first and second sides of the support column (12), Step 1 includes: obtaining the first sub-variable length of the flexible structure (3) located on the first side and the second sub-variable length of the flexible structure (3) located on the second side respectively; Step 2 includes: Step 21: Calculate the total change length based on the first sub-change length, the initial length, and the second sub-change length; Step 22: In response to the total change length being greater than a preset threshold, an alarm message is sent to the operator of the straightness measuring device so that the operator can adjust the straightness measuring device.

10. The straightness detection method according to claim 8, characterized in that, There are multiple preset thresholds, and each preset threshold corresponds to a different alarm message.

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