A transport material thickness detection system and its application

Abstract

The present invention discloses a system for detecting the thickness of transferred materials and its application, and relates to a material conveying device, comprising a transfer belt, wherein a material guide groove is provided on the input end of the transfer belt, and a first angular displacement linear sensor is arranged directly above the output end of the transfer belt, a measuring rod perpendicular to the measuring rod is fixedly connected to the input shaft of the first angular displacement linear sensor, a contact device is rotatably mounted on the other end of the measuring rod, and a reset device is also provided, one end of which is rotatably connected to the measuring rod and can keep the reset device in contact with the top of the transfer belt or the top of the material on the transfer belt at all times; the transfer belt and the first angular displacement linear sensor are respectively connected to a controller, and when the height of the material output from the discharge port is the same as its own height and the corresponding material moves to contact with the contact device, the vertical projection of the contact device is still on the transfer belt; the device provided by the present invention can effectively realize the thickness detection and weight measurement of the material.

Description

Technical Field

[0001] The invention relates to a material conveying device, in particular to a conveying device capable of collecting the thickness of conveyed materials. Background Art

[0002] At present, in the process of conveying coal in power plants, coal mines, coal preparation plants and other bulk materials in my country, traditional electronic belt scales are generally used for weighing. However, due to the high price of belt scales, the requirements for installation conditions are relatively harsh, and the operation and maintenance workload is large, therefore, generally only one belt in the entire conveyor chain composed of multiple belts is selected to install a belt scale for measurement. For the uninstalled belt, it is impossible to obtain the detailed information of the material quantity in real time. In addition, in the operation of multi-stage linkage belts, the downstream belt runs with no load at the beginning of startup, or runs at high speed with low material quantity, and the variable speed control of the conveyor belt cannot be accurately implemented, resulting in a large amount of electricity waste. Another weighing method is the laser belt scale, which uses laser scanning imaging technology to calculate the amount of coal on the belt by obtaining the cross-sectional area of ​​the material. This measurement method is based on the camera of the laser emitted to the belt material to calculate the weight. In material transportation, due to the flying pollution of materials and the harsh operating environment, the camera lens is easily contaminated and blocked, affecting the measurement effect.

[0003] The present invention hopes to calculate the weight of the material by measuring the thickness of the material on the belt. Therefore, providing a device that can stably measure the thickness of the material at any time is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a system for detecting the thickness of a transferred material to solve the technical problem in the prior art that the thickness of the material on the belt is difficult to measure in real time.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention provides a transfer material thickness detection system, comprising a transfer belt, wherein a material guide trough is provided on the input end of the transfer belt, the top end of the material guide trough is connected to a material drop pipe, and an outlet for material output is provided on the end of the material guide trough facing the transfer belt, and a first angular displacement linear sensor is provided directly above the output end of the transfer belt, a measuring rod perpendicular to the first angular displacement linear sensor is fixedly connected to the input shaft of the first angular displacement linear sensor, and the vertical plane where the midline of the measuring rod is located coincides with the vertical plane where the center of the transfer belt is located, and a contact device is rotatably installed on the other end of the measuring rod, and the contact device The bottom is a downwardly protruding arc-shaped plate structure, which is rotatably connected to the measuring rod at the center of its top. A reset device is also provided, one end of which is rotatably connected to the measuring rod and can keep it in contact with the top of the transfer belt or the top of the material on the transfer belt at all times. The contact device is arranged on one side of the vertical plane where the input axis of the first angular displacement linear sensor is located, adjacent to the output end of the transfer belt. The transfer belt and the first angular displacement linear sensor are respectively connected to the controller. When the height of the material output from the discharge port is the same as its own height, when the corresponding material moves to contact with the contact device, the vertical projection of the contact device is still on the transfer belt.

[0007] Furthermore, guide plates are respectively provided on both sides of the transfer belt.

[0008] Furthermore, the contact device is specifically composed of a raised structure with a horizontal plane on the top and an arc-shaped raised bottom, an elastic airbag whose bottom outer edge is fixedly connected to the top outer edge of the raised structure and protrudes upward, and a first signal acquisition device installed inside the raised structure and whose trigger end is movably installed at the bottom center of the raised structure. One end of the measuring rod passes through the elastic airbag and is rotatably connected to the top of the raised structure, and it is sealed and connected to the contact part of the elastic airbag. The bottom end of the trigger end of the first signal acquisition device is arranged on the outside of the bottom end of the raised structure and can be squeezed and received in the raised structure when it contacts the material and triggers the first signal acquisition device. The first signal acquisition device is connected to the controller signal.

[0009] Further, the resetting device comprises a first resetting spring.

[0010] Furthermore, the reset device also includes a driving device connected to the end of the first reset spring facing away from the measuring rod and capable of changing the distance between the end and the vertical plane where the axis of the input shaft of the first angular displacement linear sensor is located. The driving device is mounted on a fixed frame and is connected to the controller signal.

[0011] Furthermore, a scraper is rotatably installed in the material guide trough and its extension direction is perpendicular to the extension direction of the transfer belt. When the scraper rotates toward the output end of the transfer belt, the rotation limit is contact with the discharge port, and when the scraper is in a vertical state, the distance between its bottom end and the top of the transfer belt is zero.

[0012] Furthermore, the top of the scraper is also connected to a second return spring which can restore it to a vertical state after being impacted by the material.

[0013] Furthermore, the second return spring is connected to the material guide trough through a second signal acquisition device, the second signal acquisition device is connected to the controller signal, and when the bottom of the scraper rotates toward the output end of the transfer belt, its top pulls the second return spring to trigger the second signal acquisition device.

[0014] Furthermore, one end of the scraper is also fixedly connected to the input shaft of a second angular displacement linear sensor fixedly mounted on the material guide trough, the two are coaxially distributed, and the second angular displacement linear sensor is connected to the controller signal.

[0015] The present invention also provides a method for material weight detection using the above system, the method comprising:

[0016] Step 1: obtain the material thickness corresponding to different scraper inclination angles through the second angular displacement linear sensor, and at the same time obtain the inclination data of the measuring rod corresponding to the first angular displacement linear sensor when the material thickness is corresponding, and calculate the relationship between the scraper inclination angle and the measuring rod inclination angle;

[0017] Step 2, when the speed of the conveying belt remains unchanged and the thickness of the material thereon remains unchanged, initially, the position of the first return spring and its connecting end is adjusted by the driving device so that the trigger end of the first signal acquisition device contacts the material and the material at the contact position does not sink more than 5 mm;

[0018] Step 3: Turn on the transfer belt, and the controller obtains trigger data of the first signal acquisition device;

[0019] Step 4, when the first signal acquisition device is continuously or intermittently not triggered, the driving device is adjusted so that the distance between the first return spring and its connecting end relative to the vertical plane where the axis of the input shaft of the first angular displacement linear sensor is located is continuously reduced until the first signal acquisition device can be continuously triggered, and then the position of the output end of the driving device at this time is recorded as the position to be adjusted under the speed and material height;

[0020] Step 5, repeat the above steps 2-4 to count the positions to be adjusted at different speeds and heights;

[0021] Step 6. Obtain the following parameters: A. The total weight of the material output by the transfer belt within a period of time; B. Obtain the material conveying mileage of the belt based on the rotation speed and duration of the transfer belt; C. Obtain the width of the belt; D. Calculate the average thickness of the material from the bottom of the contact device to the top of the transfer belt during this period of time based on the measuring rod inclination data obtained by the first angular displacement linear sensor, and set: total weight = conveying mileage × width × average thickness × unit volume density.

[0022] Find the density per unit volume;

[0023] Step 7, the equipment operates normally, the material falls from the drop pipe into the transfer belt in the guide trough, and is transported out of the guide trough through the scraper and the discharge port. When the material passes through the scraper, the scraper tilts, and the second angular displacement linear sensor obtains its tilt angle. The required tilt angle of the measuring rod is obtained according to the relationship obtained in step 1. Before the corresponding material moves to the bottom of the contact device and contacts it, the driving device is controlled to drive the end of the first return spring to move to the required position corresponding to the required tilt angle. The first angular displacement linear sensor detects the tilt angle of the measuring rod when the corresponding material moves to contact the contact device and obtains the corresponding material thickness;

[0024] Step 8: Calculate the output material weight in the corresponding time period according to the unit volume density obtained in step 6, formula 1, and the average value of the material thickness collected in step 7.

[0025] Compared with the prior art, the present invention has the following advantages: the present invention provides a system for detecting the thickness of transferred materials, which can effectively monitor the inclination angle of a measuring rod by setting an angular displacement linear sensor, and can effectively calculate the thickness of the corresponding material according to the inclination angle, thereby realizing effective detection of the material thickness; at the same time, by adopting a signal acquisition device, the equipment can timely detect whether the contact device is suspended, thereby improving the measurement accuracy; the use of a scraper combined with an angular displacement linear sensor can effectively cut the peaks of the material and facilitate improving the measurement accuracy, and at the same time can predict the measurement value of the subsequent measuring rod and perform corresponding actions in combination with the driving device, thereby improving the measurement accuracy; the material weight measurement method provided by the present invention can quickly realize material weight measurement, thereby saving equipment costs compared with traditional equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic diagram of the structure of a system for detecting the thickness of transported materials provided in an embodiment.

[0027] In the figure: 1. transfer belt; 2. material guide trough; 3. material drop pipe; 4. material outlet; 5. first angular displacement linear sensor; 6. measuring rod; 7. controller; 8. material guide plate; 9. raised structure; 10. elastic airbag; 11. first signal acquisition device; 12. first reset spring; 13. driving device; 14. scraper; 15. second reset spring; 16. second signal acquisition device; 17. second angular displacement linear sensor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Implementation

[0030] Combination Figure 1 The present embodiment provides a transfer material thickness detection system, including a transfer belt 1, a material guide trough 2 is provided on the input end of the transfer belt 1, the top of the material guide trough 2 is connected to a drop pipe 3, and a material outlet 4 for material output is provided on the end of the material guide trough 2 facing the transfer belt 1. The traditional equipment structure is as described above, but there are certain defects in obtaining the weight of the input material by means of video, laser scanning and other equipment. In order to reduce the detection and weighing cost and improve the stability of the equipment, the present embodiment uses the following equipment to obtain the material weight:

[0031] In this embodiment, a first angular displacement linear sensor 5 is arranged just above the part where the output end of the transfer belt 1 is located, and one end of a measuring rod 6 perpendicular to the first angular displacement linear sensor 5 is fixedly mounted on the input shaft (the two are vertically connected, and when the measuring rod 6 rotates, the input shaft of the first angular displacement linear sensor 5 can be driven to rotate, so that the first angular displacement linear sensor 5 can detect the inclination angle corresponding to the measuring rod 6), and when the input shaft of the first angular displacement linear sensor 5 rotates and the measuring rod 6 rotates synchronously, the vertical plane where the center line of the measuring rod 6 is located is the same as the vertical plane where the center line of the transfer belt 1 is located (that is, the inclination angle measured by the measuring rod 6 is the inclination angle generated by the measuring rod 6 driven by the material at the center of the transfer belt 1). In order to prevent the end of the measuring rod 6 from directly contacting the material, causing the end of the measuring rod 6 to be knocked off or leaving a deep indentation on the material to affect the measurement accuracy, a contact device is rotatably installed on the other end of the measuring rod 6. The bottom of the contact device is a downwardly convex arc plate structure, and the center of the top is rotatably connected to the measuring rod 6, and the contact device can only rotate around the connection between it and the measuring rod 6 on the vertical plane (the vertical plane is the same as the vertical plane of the rotation of the measuring rod 6). In this way, the contact area is increased by the contact device contacting the material, which can effectively avoid the defect of inaccurate measurement value caused by deep indentation (obvious indentation is an indentation depth of not less than 5 mm-1 cm);

[0032] Through the above arrangement, firstly, the arc-shaped plate structure at the bottom of the contact device can effectively increase the contact area between the lateral part and the material, thereby allocating the weight of the measuring rod 6 and the contact device itself, so that no obvious indentation will be left on the material (to avoid affecting the measurement accuracy later). At the same time, the arc-shaped structure can reduce the contact area with the material along the extension direction of the transfer belt 1, reduce the friction, and facilitate the sliding of the contact device relative to the material. The two ends of the arc-shaped structure are raised to reduce the degree of collision with the material, so as to facilitate the smooth passage of the material.

[0033] In order to prevent the contact device from being knocked away during the contact with the material, in the present embodiment, a reset device is further provided, one end of which is rotatably connected to the measuring rod 6 and can enable the contact device at the bottom of the measuring rod 6 to always maintain contact with the top of the transfer belt 1 or the top of the material thereon. When there is no material on the transfer belt 1, the contact device is arranged on the transfer belt 1, and the contact device is arranged on the side of the output end of the transfer belt 1 on both sides of the vertical plane where the axis of the input shaft of the first angular displacement linear sensor 5 is located. The transfer belt 1 and the first angular displacement linear sensor 5 are respectively connected to the controller 7, and when the height of the material outputted from the discharge port 4 is the same as its own height, when the corresponding material moves to contact with the contact device, the vertical projection of the contact device is still on the transfer belt 1.

[0034] Through the above-mentioned arrangement, the reset device provides a reset pulling force for the measuring rod 6 and the contact device. When the bottom of the contact device contacts the material and generates friction to push the contact device and the measuring rod 6 to rotate, the reset device provides a reset pulling force, thereby avoiding being knocked away and keeping it always attached to the top of the material. At the same time, when the thickness of the material output by the discharge port 4 reaches the maximum, the vertical projection of the contact device is still on the transfer belt 1, which can ensure that the information of the inclination angle of the measuring rod 6 corresponding to the material can still be collected at the limit.

[0035] Working principle:

[0036] When the equipment is operating normally, the material enters the guide trough 2 from the drop tube 3 and then falls on the transfer belt 1. After the transfer belt 1 transports the material out of the guide trough 2, it can drive it to pass through the contact device. When passing through the contact device, it can drive the measuring rod 6 to rotate. The first angular displacement linear sensor 5 detects the inclination of the measuring rod 6 in real time and sends it to the controller 7. At the same time, the reset device can provide a reset force for the measuring rod 6 to prevent the contact device at the bottom from being knocked into the air, resulting in inaccurate measurement results. According to the inclination data detected by the first angular displacement linear sensor 5, combined with the fixed installation position of the equipment and the fixed length of the measuring rod 6, the thickness of the material on the transfer belt 1 passing under it at different times can be effectively calculated, thereby realizing the detection of material thickness;

[0037] In particular, the belt width of the transfer belt 1 and the material's own density will not change, and what changes are the running speed of the transfer belt 1 and the thickness of the material transported to the bottom of the contact device. Then, when the running speed of the transfer belt 1 remains unchanged and only the thickness of the material changes, the above-mentioned equipment can be used to effectively obtain the change in material thickness, and then all the output materials within a period of time are collected and weighed when the running speed of the transfer belt 1 remains unchanged, and the total weight of the material during this period of time can be obtained. Then, according to the speed of the transfer belt 1 and the length of this period, the corresponding belt running length can be obtained, and then the obtained material thickness data is averaged to obtain the average thickness, and then according to the above-mentioned belt width, length, average thickness and total weight of the material, the unit volume density of the corresponding material (not the density of the material itself) can be obtained;

[0038] Then when the equipment is running, by obtaining the running speed, running time, and inclination angle of the measuring rod 6 (the corresponding thickness is calculated by the inclination angle) of the transfer belt 1 (the belt width is known), combined with the unit volume density, the total output weight of the material in the corresponding time period can be calculated.

[0039] In particular, in this embodiment, in order to prevent the material from flowing out to the outside of the transfer belt 1 during the movement, material guide plates 8 are respectively provided on both sides of the transfer belt 1.

[0040] The two material guide plates 8 can effectively control the running direction of the materials to prevent them from flowing out.

[0041] In particular, in the present embodiment, the contact device is specifically composed of a raised structure 9 with a horizontal top and an arc-shaped raised bottom, an elastic airbag 10 with a bottom outer edge fixedly connected to the top outer edge of the raised structure 9 and a top raised upward (the raised elastic airbag 10 can bounce off the material falling thereon, thereby avoiding the disadvantage that the material accumulates thereon and affects its overall weight and causes inaccurate measurement accuracy, and at the same time can reduce the weight of the equipment), and a first signal acquisition device 11 installed inside the raised structure 9 and with a trigger end movably installed on the outside of the bottom of the raised structure 9. One end of the measuring rod 6 passes through the elastic airbag 10 and is rotatably connected to the top of the raised structure 9, and it is sealed and connected to the contact part of the elastic airbag 10. The bottom end of the trigger end of the first signal acquisition device 11 is arranged on the outside of the raised structure 9 and can be squeezed and received into the raised structure 9 and trigger the first signal acquisition device 11 when it contacts the material. The first signal acquisition device 11 is connected to the controller 7 by signal.

[0042] Through the above arrangement, after the material contacts the trigger end of the first signal acquisition device 11 at the bottom of the contact device, the first signal acquisition device 11 is triggered and a signal is sent to the controller 7. The controller 7 can determine whether the contact device maintains contact with the material based on the signal, thereby avoiding the disadvantage that the contact device is suspended and cannot be detected. At the same time, the elastic airbag 10 can prevent the material from accumulating thereon and affecting the measurement accuracy, and can also provide a certain reset force for the contact device to return to its initial position, while reducing its own weight.

[0043] In particular, the purpose of the reset device is to provide a reset force for the measuring rod 6 to prevent the contact device at its end from being suspended in the air. Therefore, the reset device can be a first reset spring 12 (the first reset spring 12 only provides a reset force). However, although the first reset spring 12 can provide a reset force, when the contact device is suspended in the air, it can only be observed by the naked eye and cannot be discovered in time, which has certain defects. In addition, the reset force provided by the first reset spring 12 cannot be accurately adjusted, and obvious indentations may occur.

[0044] Therefore, in order to overcome the above-mentioned defects, in the present embodiment, the reset device further comprises a driving device 13 which is connected to the end of the first reset spring 12 away from the measuring rod 6 and can change the distance between the end and the vertical plane where the axis of the input shaft of the first angular displacement linear sensor 5 is located. The driving device 13 (the driving device 13 can be a device such as a driving cylinder which can drive the corresponding end of the first reset spring 12 to perform linear reciprocating motion. The driving device 13 can also be composed of a servo motor and a threaded rod. The threaded rod is movably mounted on a fixed frame, one end of which is connected to the end of the first reset spring 12, and the other end is meshed with the servo motor through a connecting piece. The servo motor can drive the threaded rod to reciprocate along its axis, thereby driving the end of the first reset spring 12 to move, so as to adjust the first The purpose of the end position of the reset spring 12 is to be installed on a fixed frame (in this embodiment, the driving device 13 is a driving cylinder), and its output end is rotatably connected to the other end of the first reset spring 12 (the extension or contraction of the output end of the driving cylinder can synchronously drive the end of the first reset spring 12 to move, so that the reset force provided by the first reset spring 12 to the measuring rod 6 at the same inclination angle can be adjusted. For example, when the material thickness remains unchanged, the rotation speed of the transfer belt 1 is different, and the friction force exerted on the contact device is also different. By adjusting the driving device 13 to drive the end of the first reset spring 12 to run, the reset force exerted on the measuring rod 6 can be effectively adjusted, so that the contact device can always maintain contact with the top of the material), and the driving cylinder is connected to the controller 7 signal.

[0045] In particular, in some cases, the material may be continuously changed from too high or too low, which will cause the inclination angle of the measuring rod 6 to change sharply, which is not conducive to accurate measurement (although there is a discharge port 4 to limit the maximum height of the material, when the material falls on the transfer belt 1, its vertical cross-section is mostly mountain-shaped, and the height changes continuously, which is not conducive to the collection of thickness information). Therefore, in order to avoid the above situation, in this embodiment, a scraper 14 is rotatably installed in the guide trough 2, and the extension direction is perpendicular to the extension direction of the transfer belt 1 and the vertical plane where the rotation movement is located is the same as the vertical plane where the center line of the transfer belt 1 is located. When the scraper 14 rotates toward the output end of the transfer belt 1, the rotation limit is contact with the discharge port 4, and when the scraper 14 is in a vertical state, the distance between the bottom end and the top of the transfer belt 1 is zero (that is, when the scraper 14 is in a vertical state, no material is output through the scraper 14, and when it is tilted, the top of the passing material can be cut and the top of the material can be leveled, which is convenient for later measurement on the one hand and for improving measurement accuracy on the other hand).

[0046] In particular, in order to prevent the scraper 14 from scraping the excessively high material and being unable to return in time after reaching the height limit, in this embodiment, a second return spring 15 is also connected to the top of the scraper 14, and the other end of the second return spring 15 is connected to the inner wall of the material guide trough 2 above the discharge port 4. The scraper 14 is in a vertical state when it is not in contact with the material.

[0047] The scraper 14 can be reset in time through the above arrangement.

[0048] In particular, although the height of the material can be limited through the above-mentioned settings, the scraped material is still up and down, and only the maximum thickness remains consistent. When the material passes through the contact device, the drive device 13 needs to adjust the first return spring 12 so that the contact device can always maintain contact with the material and avoid it from being suspended in the air. However, this adjustment is not completed in advance, resulting in poor adjustment accuracy. Therefore, in order to enable accurate adjustment, the second return spring 15 is connected to the material guide trough 2 through the second signal acquisition device 16, and the second signal acquisition device 16 is connected to the controller 7 signal, and when the bottom of the scraper 14 rotates toward the output end of the transfer belt 1, its top pulls the second return spring 15 to trigger the second signal acquisition device 16.

[0049] Through the above arrangement, when the scraper 14 is tilted, its tilt signal can be collected by the second signal collection device 16, indicating that material is output, so that the driving device 13 can be controlled by the controller 7 to move in advance when the corresponding material moves to the contact device, thereby avoiding the above situation.

[0050] In particular, although the above-mentioned arrangement can make the driving device 13 move in advance, its movement amplitude cannot be accurate, and obvious indentations may occur. Therefore, in this embodiment, one end of the scraper 14 is also fixedly connected to the input shaft of the second angular displacement linear sensor 17 fixedly mounted on the material guide trough 2, and the two are coaxially distributed, and the second angular displacement linear sensor 17 is connected to the controller 7 signal.

[0051] Through the above-mentioned arrangement, when the scraper 14 is tilted, the second angular displacement linear sensor 17 can effectively monitor the tilt angle of the scraper 14. The thickness of the corresponding material can be effectively calculated based on the tilt angle of the scraper 14 detected by the second angular displacement linear sensor 17, thereby calculating the angle at which the corresponding measuring rod 6 should be tilted, and then obtaining the position to which the corresponding driving device 13 should drive the end of the first reset spring 12 to move (to avoid obvious indentations). When the material of the corresponding thickness moves to the front of the contact device, the driving device 13 is controlled to drive the first reset spring 12 to move to the corresponding position to provide the required reset force for the measuring rod 6, thereby avoiding the above-mentioned defects.

[0052] The specific steps of using the above device to detect material weight are as follows:

[0053] Step 1, obtaining the material thickness corresponding to different inclination angles of the scraper 14 through the second angular displacement linear sensor 17, and obtaining the inclination data of the measuring rod 6 corresponding to the first angular displacement linear sensor 5 when the material thickness is corresponding, and calculating the relationship between the inclination angle of the scraper 14 and the inclination angle of the measuring rod 6;

[0054] Step 2, when the speed of the conveying belt 1 remains unchanged and the thickness of the material thereon remains unchanged, initially, the position of the first return spring 12 and its connecting end is adjusted by the driving device 13 so that the trigger end of the first signal acquisition device 11 contacts the material and the material at the contact position does not sink more than 5 mm;

[0055] Step 3, start the transfer belt 1, and the controller 7 obtains the trigger data of the first signal acquisition device 11;

[0056] Step 4, when the first signal acquisition device 11 is not triggered continuously or intermittently (i.e., there is a situation where it is not triggered, which can be continuous or discontinuous), adjust the driving device 13 so that the spacing between the first reset spring 12 and its connecting end relative to the vertical plane where the axis of the input shaft of the first angular displacement linear sensor 5 is located is continuously reduced intermittently (i.e., after each reduction, wait for a period of time to observe whether the first signal acquisition device 11 can be continuously triggered), until the first signal acquisition device 11 can be continuously triggered, and then record the position of the output end of the driving device 13 at this time as the position to be adjusted under the operating speed and material height of the conveyor belt 1;

[0057] Step 5, repeat the above steps 2-4 to count the positions to be adjusted at different speeds and heights;

[0058] Step 6, obtain the following parameters: A, the total weight of the material output by the transfer belt 1 within a period of time; B, obtain the material conveying mileage of the belt according to the rotation speed and duration of the transfer belt 1; C, obtain the width of the belt; D, calculate the average thickness of the material thickness between the bottom of the contact device and the top of the transfer belt 1 during this period of time according to the inclination data of the measuring rod 6 obtained by the first angular displacement linear sensor 5, let: total weight = conveying mileage x width x thickness average x unit volume density formula 1, calculate the unit volume density;

[0059] Step 7, the equipment operates normally, the material falls from the drop tube 3 into the transfer belt 1 in the guide trough 2, and is transported out of the guide trough 2 through the scraper 14 and the discharge port 4. When the material passes through the scraper 14, the scraper 14 tilts, and the second angular displacement linear sensor 17 obtains its inclination angle. The required inclination angle of the measuring rod 6 is obtained according to the relationship obtained in step 1, and before the corresponding material moves to the bottom of the contact device and contacts it (the action is completed within 1 second), the driving device 13 is controlled to drive the end of the first return spring 12 to move to the required adjustment position corresponding to the required inclination angle (combined with step 5, the running speed of the transfer belt 1 is known, and the corresponding thickness of the scraper 14 at this time is used as the pre-contact material thickness that the contact device is about to contact, so as to determine the corresponding required adjustment position), the first angular displacement linear sensor 5 detects the inclination angle of the measuring rod 6 when the moving material moves to contact it and obtains the corresponding material thickness;

[0060] Step 8: Calculate the weight of the output material in the corresponding time period according to the unit volume density obtained in step 6, formula 1, and the average value of the material thickness collected in step 7.

[0061] Although the material itself has a fixed density, because the material falls from the drop tube 3 onto the transfer belt 1, the material input per unit time is not necessarily stable. Therefore, the amount of material falling on the transfer belt 1 at different times may be different, resulting in different corresponding material thicknesses, and thus uneven material thickness at different times. In addition, the material is not evenly distributed in a rectangular shape on the transfer belt 1, but its cross section is a mountain-shaped structure with a bulge in the middle. The top of the material that has been clipped by the scraper 14 is flatter, and some cross sections are trapezoidal. Therefore, the total weight cannot be directly calculated using the material's own density and the measured height. In this embodiment, the unit volume density calculated using the measured thickness mean as a parameter can effectively account for the uneven thickness and cross-sectional shape. The error caused by the rule is avoided, thereby improving the measurement accuracy. The error between the total material conveying weight calculated by the above method and the actual value is within ±5%; at the same time, this embodiment adopts two angular displacement linear sensors, and they are respectively arranged at the two ends of the transfer belt 1, so as to effectively avoid the situation where the front and rear thickness of the material may be inconsistent due to vibration and other reasons during the transportation of the material by the transfer belt 1 (when the material falls on the transfer belt 1, it will inevitably cause vibration, so that the material thickness of the output outlet 4 will change during the transportation. Therefore, two angular displacement linear sensors are set for detection and measurement is performed at the last moment, which can effectively reduce the error), thereby further improving the measurement accuracy; and the device has a simple structure and is easy to operate, avoiding the defects of traditional infrared scanning equipment.

[0062] In this embodiment, the plurality of signal acquisition devices may be devices such as contact switches, and any device that can be triggered by pressure and can acquire trigger signals will suffice.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A transfer material thickness detection system, comprising a transfer belt, wherein a material guide trough is provided on the input end of the transfer belt, the top of the material guide trough is connected to a material drop pipe, and a material outlet for material output is provided on the end of the material guide trough facing the transfer belt, characterized in that: A first angular displacement linear sensor is arranged directly above the output end of the transfer belt, a measuring rod perpendicular to the first angular displacement linear sensor is fixedly connected to the input shaft thereof, and the vertical plane where the midline of the measuring rod is located coincides with the vertical plane where the center of the transfer belt is located, a contact device is rotatably installed on the other end of the measuring rod, the bottom of the contact device is a downwardly protruding arc plate structure, the top center of the contact device is rotatably connected to the measuring rod, and a reset device is also provided, one end of which is rotatably connected to the measuring rod and can keep in contact with the top of the transfer belt or the top of the material on the transfer belt, and the contact device is arranged on one side of the vertical plane where the input shaft of the first angular displacement linear sensor is located, which is adjacent to the output end of the transfer belt, the transfer belt and the first angular displacement linear sensor are respectively connected to the controller, and when the height of the material output from the discharge port is the same as its own height, when the corresponding material moves to contact with the contact device, the vertical projection of the contact device is still on the transfer belt; Guide plates are respectively arranged on both sides of the transfer belt; The contact device specifically consists of a raised structure with a horizontal top and an arc-shaped raised bottom, an elastic airbag whose bottom outer edge is fixedly connected to the top outer edge of the raised structure and protrudes upward, and a first signal acquisition device installed inside the raised structure and whose trigger end is movably installed at the bottom center of the raised structure. One end of the measuring rod passes through the elastic airbag and is rotatably connected to the top of the raised structure, and is sealed with the contact part of the elastic airbag. The bottom end of the trigger end of the first signal acquisition device is arranged on the outside of the bottom end of the raised structure and can be squeezed and received into the raised structure when it contacts the material and triggers the first signal acquisition device. The first signal acquisition device is connected to the controller signal.

2. A transfer material thickness detection system according to claim 1, characterized in that: The resetting device comprises a first resetting spring.

3. A transfer material thickness detection system according to claim 2, characterized in that: The reset device also includes a driving device connected to the end of the first reset spring away from the measuring rod and capable of changing the distance between the end and the vertical plane where the axis of the first angular displacement linear sensor input shaft is located. The driving device is mounted on a fixed frame and is connected to the controller signal.

4. A transfer material thickness detection system according to claim 3, characterized in that: A scraper is rotatably installed in the material guide trough, and its extension direction is perpendicular to the extension direction of the transfer belt. When the scraper rotates toward the output end of the transfer belt, the rotation limit is contact with the discharge port, and when the scraper is in a vertical state, the distance between its bottom end and the top of the transfer belt is zero.

5. A transfer material thickness detection system according to claim 4, characterized in that: The top of the scraper is also connected to a second return spring which can restore it to a vertical state after being impacted by the material.

6. A transfer material thickness detection system according to claim 5, characterized in that: The second return spring is connected to the material guide trough through a second signal acquisition device, the second signal acquisition device is connected to the controller signal, and when the bottom of the scraper rotates toward the output end of the transfer belt, its top pulls the second return spring to trigger the second signal acquisition device.

7. A transfer material thickness detection system according to claim 6, characterized in that: One end of the scraper is also fixedly connected to the input shaft of the second angular displacement linear sensor fixedly installed on the material guide trough, and the two are coaxially distributed. The second angular displacement linear sensor is connected to the controller signal.

8. A method for material weight detection using the transport material thickness detection system according to claim 7, characterized in that: The method includes: Step 1: obtain the material thickness corresponding to different scraper inclination angles through the second angular displacement linear sensor, and at the same time obtain the inclination data of the measuring rod corresponding to the first angular displacement linear sensor when the material thickness is corresponding, and calculate the relationship between the scraper inclination angle and the measuring rod inclination angle; Step 2, when the speed of the conveying belt remains unchanged and the thickness of the material thereon remains unchanged, initially, the position of the first return spring and its connecting end is adjusted by the driving device so that the trigger end of the first signal acquisition device contacts the material and the material at the contact position does not sink more than 5 mm; Step 3: Turn on the transfer belt, and the controller obtains trigger data of the first signal acquisition device; Step 4, when the first signal acquisition device is continuously or intermittently not triggered, the driving device is adjusted so that the distance between the first return spring and its connecting end relative to the vertical plane where the axis of the input shaft of the first angular displacement linear sensor is located is continuously reduced until the first signal acquisition device can be continuously triggered, and then the position of the output end of the driving device at this time is recorded as the position to be adjusted under the speed and material height; Step 5, repeat the above steps 2-4 to count the positions to be adjusted at different speeds and heights; Step 6, obtain the following parameters: A, the total weight of the material output by the transfer belt within a period of time; B, obtain the material conveying mileage of the belt according to the transfer belt speed and duration; C, obtain the width of the belt; D, calculate the average thickness of the material between the bottom of the contact device and the top of the transfer belt during this period of time according to the measuring rod inclination data obtained by the first angular displacement linear sensor, let: ; Find the density per unit volume; Step 7, the equipment operates normally, the material falls from the drop pipe into the transfer belt in the guide trough, and is transported out of the guide trough through the scraper and the discharge port. When the material passes through the scraper, the scraper tilts, and the second angular displacement linear sensor obtains its tilt angle. The required tilt angle of the measuring rod is obtained according to the relationship obtained in step 1. Before the corresponding material moves to the bottom of the contact device and contacts it, the driving device is controlled to drive the end of the first reset spring to move to the required position corresponding to the required tilt angle. The first angular displacement linear sensor detects the tilt angle of the measuring rod when the corresponding material moves to contact the contact device and obtains the corresponding material thickness; Step 8: Calculate the output material weight in the corresponding time period according to the unit volume density obtained in step 6, formula 1, and the average value of the material thickness collected in step 7.

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