Material self-adaptive relaxation device based on non-contact measurement and screening method

Abstract

The present application relates to a kind of material self-adaptive relaxation device and screening method based on non-contact measurement, belong to mineral screening technical field, solve the problem that relaxation screen cannot be applied to the characteristics of incoming material in prior art.The present application includes relaxation screen, non-contact measurement mechanism and counterweight adjusting mechanism;The relaxation screen includes fixed frame and floating frame, the floating frame is connected with the fixed frame;The counterweight adjusting mechanism includes counterweight, the counterweight is connected with the floating frame;The non-contact measurement mechanism is arranged in one side of the relaxation screen, for obtaining the motion characteristics of the fixed frame and the floating frame, the motion characteristics are used for the adjustment of the counterweight.The present application can adapt to the change of the processing capacity, particle size composition, moisture and hardness etc. characteristics of different materials, so as to realize efficient screening.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral screening, and in particular to a material adaptive relaxation device and a screening method based on non-contact measurement. Background Art

[0002] Screening is a key link in the clean and efficient use of mineral resources. It is mainly used in mineral classification, dehydration, desludging and other operations. The relaxation screen is a new type of screening machine that uses a screen surface made of polyurethane elastic material for relaxation. The flexible screen surface is periodically tensioned and relaxed, and the screen surface vibration intensity can reach 50g (1g means 9.8m / s 2 ) to fully loosen and screen the material on the screen surface. Because the flexible screen surface is made of elastic material, the screen holes undergo a certain degree of deformation during the screening process, reducing the problem of material blocking the holes. In recent years, the relaxation screen has been widely used for deep screening of mineral resources.

[0003] Contact measurement (vibration testing, strain or stress measurement) is often used to detect vibration on screening equipment. This method has the following disadvantages: it can only measure the area where the sensor is installed, not the entire area, resulting in a narrow measurement range; the sensor is placed on the screen surface, causing distortion of the measured screen surface vibration signal due to inertia; and contact measurement is limited by the installation method and surface contact conditions, resulting in poor stability and low detection efficiency.

[0004] During normal operation, the operating parameters of a flap screen are fixed, and a single operating condition is applied to materials with different characteristics. The flap screen lacks a mechanism to adjust operating parameters such as relative amplitude. This means it cannot automatically adjust to changes in material characteristics such as throughput, particle size composition, moisture content, and hardness. Furthermore, when the characteristics of the material being screened change significantly, the original vibration operating conditions are no longer sufficient for efficient screening. Summary of the Invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a material adaptive relaxation device and screening method based on non-contact measurement, so as to solve the problem that the existing relaxation screen cannot be adapted to the characteristics of the feed material.

[0006] On the one hand, the present invention provides a material adaptive relaxation device based on non-contact measurement, including a relaxation screen, a non-contact measurement mechanism and a counterweight adjustment mechanism; the relaxation screen includes a fixed frame and a floating frame, and the floating frame is connected to the fixed frame; the counterweight adjustment mechanism includes a counterweight, and the counterweight is connected to the floating frame; the non-contact measurement mechanism is arranged on one side of the relaxation screen, for obtaining the motion characteristics of the fixed frame and the floating frame, and the motion characteristics are used for adjusting the counterweight.

[0007] Furthermore, the non-contact measurement mechanism includes a guide rail seat, a protective box, an industrial camera and a lifting assembly; the protective box is arranged at one end of the guide rail seat, the industrial camera is arranged at the top of the lifting assembly, and the bottom of the lifting assembly moves along the guide rail seat.

[0008] Furthermore, the guide rail seat includes a base plate, a V-shaped guide rail and an arc-shaped guide rail; the protective box is arranged on the base plate, and the V-shaped guide rail and the arc-shaped guide rail are arranged parallel to the top of the base plate.

[0009] Furthermore, the lifting assembly also includes a first-stage lifting cylinder, a second-stage lifting cylinder and a third-stage lifting cylinder arranged in sequence from bottom to top, and the industrial camera is arranged on the top of the third-stage lifting cylinder.

[0010] Furthermore, the lifting assembly also includes a first roller and a second roller, and the first roller and the second roller are both arranged at the bottom of the first-level lifting cylinder.

[0011] Furthermore, the first roller rolls along the V-shaped guide rail, and the second roller rolls along the arc-shaped guide rail.

[0012] Furthermore, the lower end of the secondary lifting cylinder is located in the primary lifting cylinder and slides therein, and the lower end of the tertiary lifting cylinder is located in the secondary lifting cylinder and slides therein.

[0013] Furthermore, the relaxation screen also includes a first mounting seat, a first support column and a second support column; the height of the first support column is less than the height of the second support column, and the lower end of the first support column and the lower end of the second support column are both connected to the first mounting seat.

[0014] Furthermore, the upper ends of the first supporting columns and the second supporting columns are both connected to the fixing frame.

[0015] On the other hand, the present invention provides a method for adaptively screening materials, which uses the above-mentioned adaptive relaxation device to adaptively screen materials.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) The non-contact measuring mechanism of the present invention is arranged on one side of the relaxation screen and is used to obtain the motion characteristics of the fixed frame and the floating frame. The counterweight of the counterweight adjustment mechanism is connected to the floating frame, and the counterweight is adjusted according to the motion characteristics, thereby realizing the adjustment of the relative amplitude of the floating frame, so that the relaxation screen can be adaptively matched with different types of screening materials to adapt to the changes in the processing capacity, particle size composition, moisture content and hardness of different materials, thereby realizing efficient screening. The non-contact measurement ensures the measurement accuracy.

[0018] (2) The present invention tracks the identified target, adopts a cyclic algorithm to identify each frame of the image, establishes an array to store the position information of the center of mass of each frame, and after the cyclic calculation is completed, draws the motion trajectory of the tracked target according to the data in the array, retains the fluctuation of the movement of the screening machine during actual operation, is not affected by filtering, and the monitored motion trajectory is more accurate.

[0019] (3) The lifting assembly of the present invention includes a support seat, a gear, a rocker arm and a support rod. The four support seats are evenly distributed around the annular fixed seat. The gear is engaged with the rotating seat. One end of the rocker arm passes through the support seat and is connected to the gear. The other end is hinged to the lower end of the support rod. The upper end of the support rod is hinged to the bottom of the secondary lifting cylinder. The inner ring wall of the annular fixed seat is provided with a first arc groove, the outer wall of the rotating seat is provided with a second arc groove, a gap is provided between the rotating seat and the annular fixed seat, and a plurality of ball bearings are provided between the first arc groove and the second arc groove. The rotation of the rotating seat synchronously drives the four rocker arms to swing, and then drives the four support rods to swing synchronously, so as to realize the stable lifting of the secondary lifting cylinder in the first lifting cylinder.

[0020] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0022] Figure 1 Schematic diagram of the structure of the material adaptive relaxation device (excluding the counterweight adjustment mechanism) of specific embodiment 1;

[0023] Figure 2 Schematic diagram of the connection structure between the counterweight adjustment mechanism and part of the relaxation screen in specific embodiment 1;

[0024] Figure 3 This is a schematic structural diagram of the non-contact measurement mechanism of specific embodiment 1;

[0025] Figure 4 This is a schematic diagram of the connection structure between the secondary lifting cylinder and its lifting components in specific embodiment 1;

[0026] Figure 5 Schematic diagram of the structure of the lifting component for the secondary lifting cylinder of the specific embodiment 1;

[0027] Figure 6This is a schematic diagram of the connection structure of the rotating seat, the annular fixed seat, the rotating shaft and the supporting seat on the bottom plate of the first-level lifting cylinder of specific embodiment 1;

[0028] Figure 7 This is a schematic diagram of the connection structure of the annular fixing seat, the ball bearings and the support seat on the bottom plate of the first-stage lifting cylinder of specific embodiment 1;

[0029] Figure 8 Schematic diagram of the structure of the rotating base of specific embodiment 1;

[0030] Figure 9 Schematic diagram of the structure of the first-stage lifting cylinder of specific embodiment 1;

[0031] Figure 10 This is one of the structural diagrams of the secondary lifting cylinder of specific embodiment 1;

[0032] Figure 11 This is the second structural diagram of the secondary lifting cylinder of specific embodiment 1;

[0033] Figure 12 Schematic diagram of the structure of the three-stage lifting cylinder of specific embodiment 1;

[0034] Figure 13 Schematic diagram of the connection structure of the screw rod, the second mounting base and the second motor in specific embodiment 1;

[0035] Figure 14 This is a schematic diagram of identifying the marking point located in the middle end area of ​​the fixed frame according to specific embodiment 2;

[0036] Figure 15 Schematic diagram of the motion trajectory of the tracking target within two cycles of specific embodiment 2.

[0037] Reference numerals:

[0038] 100 - flip-flop screen; 101 - first mounting base; 102 - first support column; 103 - second support column; 104 - fixed frame; 105 - floating frame; 106 - shear spring; 107 - first connecting plate; 108 - flexible screen surface; 109 - vibration motor; 110 - second connecting plate;

[0039] 200 - non-contact measuring mechanism; 201 - guide rail base; 202 - protective box; 203 - industrial camera; 204 - lifting assembly; 205 - base plate; 206 - V-shaped guide rail; 207 - curved guide rail; 208 - first-stage lifting cylinder; 209 - second-stage lifting cylinder; 210 - third-stage lifting cylinder; 211 - first roller; 212 - second roller; 213 - rotating base; 214 - first motor; 215 - rotating shaft; 216 - annular fixing seat; 217 - first arcuate groove; 218 - second arcuate groove; 219 - ball bearing; 220 - support seat; 221 - gear; 222 - rocker; 223 - support rod; 224 - first guide groove; 225 - connecting platform; 226 - connecting column; 227 - first guide rail; 228 - second guide groove; 229 - second motor; 230 - second mounting seat; 231 - lead screw; 232 - second guide rail;

[0040] 300-Counterweight adjustment mechanism; 301-Counterweight; 302-Oil outlet pipe; 303-Oil inlet pipe; 304-Hydraulic oil tank; 305-Hydraulic oil pump; 306-Oil delivery pipe; 307-One-way solenoid valve. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0042] Example 1

[0043] A specific embodiment of the present invention, as Figure 1 and Figure 2 As shown, a material adaptive relaxation device based on non-contact measurement is disclosed, including a relaxation screen 100, a non-contact measuring mechanism 200 and a counterweight adjustment mechanism 300. The non-contact measuring mechanism 200 is arranged on one side of the relaxation screen 100, and is used to obtain the motion characteristics of the relaxation screen 100, and adjust the relative amplitude of the floating frame 105 according to the motion characteristics, so that the relaxation screen 100 is adapted to different types of screening materials and realizes adaptation; the counterweight 301 of the counterweight adjustment mechanism 300 is connected to the floating frame 105.

[0044] Compared with the prior art, the material adaptive relaxation device provided in this embodiment has a non-contact measuring mechanism 200 arranged on one side of the relaxation screen 100 for obtaining the motion characteristics of the fixed frame 104 and the floating frame 105. The counterweight 301 of the counterweight adjustment mechanism 300 is connected to the floating frame 105, and the counterweight 301 is adjusted according to the motion characteristics, thereby realizing the adjustment of the relative amplitude of the floating frame 105, so that the relaxation screen 100 can be adaptively adapted to different types of screening materials to adapt to changes in the processing capacity, particle size composition, moisture content, hardness and other characteristics of different materials, thereby realizing efficient screening, and non-contact measurement ensures measurement accuracy.

[0045] As Figure 1 shown, the flip-flopping screen 100 comprises a first mounting base 101, a first support column 102 and a second support column 103, both of which are provided with two, the height of the first support column 102 is less than that of the second support column 103, and the lower ends of the first support column 102 and the second support column 103 are connected with the first mounting base 101.

[0046] As Figure 1 shown, the flip-flopping screen 100 further comprises a fixed frame 104, a floating frame 105 and a shear spring 106, two first support columns 102 are arranged at the front ends of the fixed frame 104, two second support columns 103 are arranged at the rear ends of the fixed frame 104, the upper end of the first support column 102 is connected with the front end of the fixed frame 104, the upper end of the second support column 103 is connected with the rear end of the fixed frame 104, the floating frame 105 is connected with the fixed frame 104 through the shear spring 106, the shear spring 106 is provided with a plurality of, and the upper and lower sides of the floating frame 105 are both provided with the shear spring 106.

[0047] Specifically, the fixed frame 104 is provided with a slot hole, the middle part of the floating frame 105 is located in the middle space of the fixed frame 104, the two sides of the floating frame 105 are arranged in the slot hole and extend out from the two outer side walls of the fixed frame 104, two first connecting plates 107 are arranged on the two outer side walls of the fixed frame 104, and the two first connecting plates 107 are located on the upper and lower sides of the slot hole. One end of the shear spring 106 is connected with the first connecting plate 107, and the other end is connected with the floating frame 105. It should be noted that the connection positions of the first support column 102 and the second support column 103 with the fixed frame 104 are both located above the floating frame 105.

[0048] As Figure 1 shown, the flip-flopping screen 100 further comprises a flexible screen surface 108 and a vibration motor 109, and the flexible screen surface 108 is arranged on the cross beam of the floating frame 105. The vibration motor 109 is connected with the fixed frame 104 through a second connecting plate 110.

[0049] In this embodiment, the floating frame 105 is connected with the fixed frame 104 through the shear spring 106, under the action of the vibration motor 109, the floating frame 105 generates a phase difference with the fixed frame 104 based on the double-mass sub-resonance principle, so that the elastic screen surface is periodically relaxed and tensioned, the flip-flopping movement of the elastic screen surface gives the material on the screen surface a high projection intensity, and promotes the layering and screening of the material.

[0050] As Figure 1 and Figure 3As shown, the non-contact measurement mechanism 200 includes a guide rail seat 201, a protective box 202, an industrial camera 203 and a lifting assembly 204. The protective box 202 is arranged at one end of the guide rail seat 201, the industrial camera 203 is arranged on the top of the lifting assembly 204, and the bottom of the lifting assembly 204 moves along the guide rail seat 201. When shooting is not required, the lifting assembly 204 drives the industrial camera 203 to move into the protective box 202.

[0051] like Figure 3 As shown, guide rail base 201 includes a base plate 205, a V-shaped guide rail 206, and an arcuate guide rail 207. V-shaped guide rail 206 and arcuate guide rail 207 are arranged parallel to the top of base plate 205 and extend into the interior of protective box 202, enabling lift assembly 204 to move the industrial camera 203 into protective box 202. In this embodiment, V-shaped guide rail 206 has high guiding precision, automatically replenishes after wear, and facilitates chip removal. Arcuate guide rail 207 is easy to install.

[0052] like Figure 3 As shown, the lifting assembly 204 includes a first-stage lifting cylinder 208, a second-stage lifting cylinder 209, and a third-stage lifting cylinder 210. The first-stage lifting cylinder 208, the second-stage lifting cylinder 209, and the third-stage lifting cylinder 210 are arranged in order from bottom to top. The lower portion of the second-stage lifting cylinder 209 can be raised and lowered within the first-stage lifting cylinder 208, and the lower portion of the third-stage lifting cylinder 210 can be raised and lowered within the second-stage lifting cylinder 209. The industrial camera 203 is located on top of the third-stage lifting cylinder 210. It should be noted that, depending on actual needs, the lifting assembly 204 may also include a fourth-stage lifting cylinder, a fifth-stage lifting cylinder, etc.

[0053] like Figure 3 、 Figure 4 and Figure 5 As shown, the lifting assembly 204 also includes a first roller 211 and a second roller 212. The first roller 211 and the second roller 212 are both arranged at the bottom of the first-level lifting cylinder 208, and there are two first rollers 211 and two second rollers 212. The first roller 211 rolls along the V-shaped guide rail 206, and the second roller 212 rolls along the arc guide rail 207.

[0054] Combine Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the lifting assembly 204 also includes a rotating seat 213, a first motor 214, and a rotating shaft 215. The first motor 214 is connected to the rotating shaft 215 and drives the rotating shaft 215 to rotate. The rotating seat 213 is mounted on the rotating shaft 215 and rotates synchronously with the rotating shaft 215. The first motor 214 is mounted on the bottom of the first-stage lifting cylinder 208. An annular fixing seat 216 is provided on the bottom plate of the first-stage lifting cylinder 208. The inner wall of the annular fixing seat 216 is provided with a first arcuate groove 217. The outer wall of the rotating seat 213 is provided with a second arcuate groove 218. A gap is provided between the rotating seat 213 and the annular fixing seat 216. A plurality of balls 219 are provided between the first arcuate groove 217 and the second arcuate groove 218. The balls 219 roll in the space between the first arcuate groove 217 and the second arcuate groove 218. It should be noted that in order to limit the spacing between the balls 219, a ball support (not shown) is provided between the first arcuate groove 217 and the second arcuate groove 218.

[0055] In this embodiment, a first arcuate groove 217 is provided on the inner wall of the annular fixed seat 216, and a second arcuate groove 218 is provided on the outer wall of the rotating seat 213. A ball 219 is provided between the first arcuate groove 217 and the second arcuate groove 218, which supports the rotating seat 213 while facilitating the rotation of the rotating seat 213.

[0056] Combine Figure 4 、 Figure 5 and Figure 6 As shown, the lifting assembly 204 further includes four support bases 220, four gears 221, four rocker arms 222, and four support rods 223. The support bases 220 are disposed on the bottom plate of the first-stage lifting cylinder 208 and are evenly distributed around the annular fixed base 216. The gears 221 mesh with the rotating base 213. It is understood that the upper portion of the rotating base 213 is provided with teeth that mesh with the gears 221. The rocker arms 222 are L-shaped, with one end of the rocker arm 222 passing through the support base 220 and connected to the gears 221. The other end is hinged to the lower end of the support rod 223. The upper end of the support rod 223 is hinged to the bottom of the second-stage lifting cylinder 209.

[0057] It is worth noting that the support seat 220, gear 221, rocker arm 222 and support rod 223 serve as a transmission mechanism, and there are four groups in total, which are evenly distributed along the circumference of the annular fixed seat 216. The rotation of the rotating seat 213 synchronously drives the four rocker arms 222 to swing, and then drives the four support rods 223 to swing synchronously, thereby realizing the lifting and lowering of the secondary lifting cylinder 209. It can be understood that the swinging direction and angle of the four rocker arms 222 are the same, and the swinging direction and angle of the four support rods 223 are also the same.

[0058] The secondary lifting cylinder 209 is lifted and lowered inside the primary lifting cylinder 208. In order to guide the secondary lifting cylinder 209 and limit the freedom in other directions, Figure 9As shown, a first guide groove 224 is provided on the inner wall of the first-stage lifting cylinder 208. It is understood that four first guide grooves 224 are correspondingly distributed on the four inner walls of the first-stage lifting cylinder 208. Preferably, the first guide grooves 224 are dovetail-shaped. The lower end of the first guide groove 224 is shorter than the lower end of the first-stage lifting cylinder 208.

[0059] In order to connect with the support rod 223, as Figure 4 、 Figure 10 and Figure 11 As shown, a connecting platform 225 is provided at the bottom of the secondary lifting cylinder 209. Connecting posts 226 are provided around the connecting platform 225, and the connecting posts 226 are hingedly connected to the upper end of the support rod 223. A first guide rail 227 is provided on the outer wall of the secondary lifting cylinder 209. The first guide rail 227 cooperates with the first guide groove 224, and the first guide rail 227 slides up and down within the first guide groove 224. To limit the freedom of the tertiary lifting cylinder 210 in other directions, a second guide groove 228 is provided on the inner wall of the secondary lifting cylinder 209. Preferably, the second guide groove 228 is a dovetail groove.

[0060] like Figure 13 As shown, the lifting assembly 204 also includes a second motor 229, a second mounting seat 230 and a screw rod 231. The second motor 229 is installed on the second mounting seat 230, and the second mounting seat 230 is installed at the bottom of the secondary lifting cylinder 209. The lower end of the screw rod 231 is connected to the second motor 229, and the upper end of the screw rod 231 is threadedly connected to the bottom of the tertiary lifting cylinder 210.

[0061] like Figure 12 As shown, a second guide rail 232 is provided on the outer wall of the third-stage lifting cylinder 210. The second guide rail 232 slides in the second guide groove 228. The second motor 229 drives the screw rod 231 to rotate. Since the third-stage lifting cylinder 210 is connected to the second-stage lifting cylinder 209 via the second guide rail 232 and the second guide groove 228, the rotational freedom of the third-stage lifting cylinder 210 is limited. The rotation of the screw rod 231 drives the third-stage lifting cylinder 210 to move up and down along the second-stage lifting cylinder 209.

[0062] During the normal operation of the relaxation screen 100, the flexible screen surface 108 is driven by the cross beams of the fixed frame 104 and the floating frame 105 to perform periodic motion. However, the properties of the screening materials are not stable, so a single ejection intensity cannot guarantee the screening efficiency of materials with different properties. The relaxation motion characteristics of the flexible screen surface 108 depend on the relative motion characteristics of the fixed frame 104 and the floating frame 105, among which the quality of the floating frame 105 is an extremely critical factor. In order to make the ejection intensity of the relaxation screen 100 adjustable according to the working conditions of different materials and realize efficient screening of materials with different properties, the material adaptive relaxation device is provided with a counterweight adjustment mechanism 300, such as Figure 2As shown, the counterweight adjustment mechanism 300 includes a counterweight 301, an oil outlet pipe 302, an oil inlet pipe 303, a hydraulic oil tank 304, and a hydraulic oil pump 305. The counterweight 301 is mounted on the floating frame 105 and has an oil storage space within it. One end of the oil outlet pipe 302 is connected to the oil storage space within the counterweight 301 and the other end is connected to the hydraulic oil pump 305. The oil inlet pipe 303 is connected to the oil storage space within the counterweight 301 and the other end is connected to the oil outlet pipe 302. The counterweight adjustment mechanism 300 also includes an oil delivery pipe 306, which connects the hydraulic oil pump 305 and the hydraulic oil tank 304. When some oil is withdrawn from the counterweight 301, the weight of the counterweight 301 decreases. When oil is delivered to the oil storage space within the counterweight 301, the weight of the counterweight 301 increases. As will be appreciated, both the oil outlet pipe 302 and the oil inlet pipe 303 are equipped with one-way solenoid valves 307.

[0063] In this embodiment, a counterweight adjustment mechanism 300 is provided to the floating frame 105 to adjust the counterweight 301 of the floating frame 105 and adjust the relative movement of the floating frame 105 and the fixed frame 104, so as to achieve the purpose of adjusting the ejection intensity of the relaxation screen 100, so that the relaxation screen 100 can adapt to screening materials of different properties.

[0064] It should be noted that the material adaptive relaxation device also includes a controller (such as an industrial computer), which is used for image processing and control of the vibration motor 109, industrial camera 203, first motor 214, second motor 229, hydraulic oil pump 305, and one-way solenoid valve 307.

[0065] Example 2

[0066] Another specific embodiment of the present invention discloses a material adaptive screening method based on non-contact measurement, which uses the material adaptive relaxation device of Example 1 to adaptively screen the material, including the following steps:

[0067] Step 1: Adjust the height of the industrial camera 203 to collect images of the marked points on the side panels of the fixed frame 104 and the floating frame 105 during the stable operation phase of the screening.

[0068] In order to obtain the movement information of key parts of the screen body such as the fixed frame 104 side plate, the floating frame 105 side plate, etc., marking points are set at the positions of the fixed frame 104 feeding end, the fixed frame 104 middle end, the fixed frame 104 discharging end, the floating frame 105 feeding end, the floating frame 105 middle end, and the floating frame 105 discharging end of the relaxation screen 100 side plate, and the industrial camera 203 visual system is used to capture and collect image information.

[0069] Step 2: Process the collected image information.

[0070] Step 2.1: Target identification.

[0071] In order to avoid interference from other image information and ensure the accuracy of recognition, first extract any captured frame image for target recognition. Grayscale the image, and set the grayscale value of the binary threshold segmentation to 50 according to the grayscale histogram. Perform area restriction processing, use the regionprops function to measure the area of ​​each connected component in the image, and set a region area restriction based on the measurement results to distinguish the area of ​​the marked point from the area of ​​other regions. Get the center of mass of the marked point as the recognition target, and use the movement of the center of mass to represent the movement of the marked point, thus completing the target recognition. Figure 14 As shown, Figure (a) is a schematic diagram of the marking point located in the middle end area of ​​the fixed frame 104 before recognition, and Figure (b) is a schematic diagram of the marking point located in the middle end area of ​​the fixed frame 104 after recognition.

[0072] Step 2.2: Target tracking.

[0073] Track the identified target using a loop algorithm to identify each frame and create an array to store the position of the center of mass of each frame. After the loop calculation is completed, the trajectory of the tracked target (center of mass) is drawn based on the data in the array. Figure 15 It tracks the motion trajectory of the target within two cycles. It can be seen that the trajectory is not a strict ellipse. Each position point has a certain range of fluctuations. This shows that the visual algorithm retains the fluctuations of the actual movement of the screen machine. The monitored motion trajectory is more accurate. Compared with contact vibration testing, it is not affected by filtering, so the accuracy is higher.

[0074] Step 3: Using the above target identification and tracking, obtain the displacement information of the key parts of the screen body. Perform differential processing on the displacement signal to obtain kinematic information such as velocity and acceleration of the key area.

[0075] Step 4: Based on the obtained kinematic information of the fixed frame 104 and the floating frame 105 , the amplitude of the floating frame 105 is adjusted to achieve material adaptation.

[0076] Step 4.1: Based on the kinematic information, the relative motion amplitude of the middle end mark point of the side plate of the fixed frame 104 and the middle end mark point of the side plate of the floating frame 105 is obtained as the relative amplitude of the fixed frame 104 and the floating frame 105.

[0077] Step 4.2: Adjust the counterweight 301 to test the screening effect and select the relative amplitude range.

[0078] Select the most on-site production of materials as test samples, adjust the counterweight 301 of the floating frame 105, and conduct a screening test on the test samples to test how much counterweight 301 is best for the screening effect of the test samples. Select the comprehensive separation index as the evaluation index. With the increase of the relative amplitude, the comprehensive separation index should first increase and then decrease, so the relative amplitude range of the two tests with the highest comprehensive separation index is selected as the optimal range. According to the relative amplitude range captured by the non-contact measurement mechanism 200, set the amplitude range as the reasonable working interval of the relative motion amplitude of the floating frame 105 and the fixed frame 104.

[0079] Step 4.3: Adjust the counterweight adjustment mechanism 300 according to the relative amplitude range to adapt to different types of materials.

[0080] When screening a certain material, use the difference in relative motion amplitude captured by the non-contact measurement mechanism 200 to determine whether the relative amplitude is within the reasonable working interval. When the relative amplitude is not within the interval, adjust the counterweight 301 on the floating frame 105 using the counterweight adjustment mechanism 300 to change the amplitude of the floating frame 105. Specifically, when the relative amplitude is greater than the interval, increase the counterweight 301 on the floating frame 105 to reduce the motion amplitude of the floating frame 105; when the relative amplitude is less than the interval, reduce the counterweight 301 on the floating frame 105 to increase the motion amplitude of the floating frame 105.

[0081] For different processing capacity of materials: when the material increases and the processing capacity increases, the non-contact measurement mechanism 200 will monitor that the relative amplitude is less than the reasonable working interval, so it is necessary to reduce the counterweight 301 on the floating frame 105 to increase the relative motion amplitude until the relative amplitude is within the reasonable working interval, and vice versa when the processing capacity decreases.

[0082] For different particle sizes of materials: when the raw coal screening test results show that there are more materials close to the screen size, including blocking particles (particle size is 1-1.5 times the screen size) and difficult screening particles (particle size is 0.75-1 times the screen size), which will cause poor screening efficiency, at this time the relative motion amplitude should be increased, and the throwing intensity of the screen surface should be increased, so the counterweight 301 on the floating frame 105 should be reduced.

[0083] For different hardness of materials: when the material hardness is higher than the test sample material, in order to avoid impact damage of the material, increase the counterweight 301 on the floating frame 105 to reduce the relative motion amplitude.

[0084] For different moisture of materials: when the material moisture is higher than the test sample material, in order to improve the screening efficiency, reduce the counterweight 301 on the floating frame 105 to reduce the relative motion amplitude.

[0085] By the above non-contact measurement relative amplitude and the method of adjusting the relative amplitude of the counterweight 301 on the floating frame 105, the flip-flop screen 100 is adapted to different types of screening materials, and self-adaptation is realized.

[0086] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which shall be covered within the protection scope of the present application.

Claims

1. A material adaptive screening method based on a material adaptive relaxation device of non-contact measurement, characterized in that: The material adaptive relaxation device includes a relaxation screen, a non-contact measuring mechanism, and a counterweight adjustment mechanism; the relaxation screen includes a fixed frame and a floating frame, the floating frame being connected to the fixed frame; the counterweight adjustment mechanism includes a counterweight, which is connected to the floating frame; the non-contact measuring mechanism is provided on one side of the relaxation screen and is used to obtain the motion characteristics of the fixed frame and the floating frame, and the motion characteristics are used to adjust the counterweight; the material adaptive screening method includes the following steps: Step 1: Adjust the height of the industrial camera and collect images of the marked points on the fixed frame side panels and the floating frame side panels during the stable operation stage of the screening; set marked points on the fixed frame feed end, fixed frame middle end, fixed frame discharge end, floating frame feed end, floating frame middle end, and floating frame discharge end of the relaxation screen side panels, and use the industrial camera vision system to capture the collected image information; Step 2: Process the collected image information; Step 2.1: Target identification; Grayscale the image, set the grayscale value of the binary threshold segmentation to 50 according to the grayscale histogram; Perform restricted area processing, use the regionprops function to measure the area of ​​each connected component in the image, set a region area limit based on the measurement result, so that the area of ​​the marked point is distinguished from the area of ​​other regions; Obtain the centroid of the marked point as the identification target, use the movement of the centroid to represent the movement of the marked point, and complete the target identification; Step 2.2: Target tracking; Track the identified target, use the loop algorithm to identify each frame of the image, and establish an array to store the position information of the centroid of each frame; After the loop calculation is completed, the motion trajectory of the tracking target is drawn according to the data in the array; Step 3: Using the identification and tracking of the above targets, obtain the displacement information of the key parts of the screen body; perform differential processing on the displacement signal to obtain the velocity and acceleration kinematic information of the key area; Step 4: Based on the obtained kinematic information of the fixed frame and the floating frame, adjust the amplitude of the floating frame to achieve material adaptation; Step 4.1: Based on the kinematic information, obtain the relative motion amplitude of the mark point at the middle end of the fixed frame side plate and the mark point at the middle end of the floating frame side plate as the relative amplitude of the fixed frame and the floating frame; Step 4.2: Adjust the counterweight to test the screening effect and select the relative amplitude range; Select the material with the largest on-site output as the test sample, adjust the counterweight of the floating frame, and test the test sample. Perform a screening test to determine the optimal counterweight for screening the test sample. Select the comprehensive separation index as the evaluation indicator. As the relative amplitude increases, the comprehensive separation index should first increase and then decrease. Therefore, the relative amplitude range of the two tests with the highest comprehensive separation index is selected as the optimal range. Based on the relative amplitude range captured by the non-contact measurement mechanism, set this amplitude range as the reasonable operating range for the relative motion amplitude of the floating frame and the fixed frame. Step 4.3: Adjust the counterweight adjustment mechanism based on the relative amplitude range to accommodate different types of materials. When screening a material, use the difference in relative motion amplitudes captured by the non-contact measurement mechanism to determine whether the relative amplitude is within a reasonable operating range. When the relative amplitude is not within the interval, the counterweight on the floating frame is adjusted using the counterweight adjustment mechanism to change the amplitude of the floating frame.

2. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 1 is characterized in that: The non-contact measurement mechanism includes a guide rail seat, a protective box, an industrial camera and a lifting assembly; the protective box is arranged at one end of the guide rail seat, the industrial camera is arranged at the top of the lifting assembly, and the bottom of the lifting assembly moves along the guide rail seat.

3. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 2 is characterized in that: The guide rail seat comprises a bottom plate, a V-shaped guide rail and an arc-shaped guide rail; the protection box is arranged on the bottom plate, and the V-shaped guide rail and the arc-shaped guide rail are arranged in parallel on the top of the bottom plate.

4. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 3 is characterized in that: The lifting assembly also includes a first-stage lifting cylinder, a second-stage lifting cylinder and a third-stage lifting cylinder arranged in sequence from bottom to top, and the industrial camera is arranged on the top of the third-stage lifting cylinder.

5. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 4 is characterized in that: The lifting assembly also includes a first roller and a second roller, and the first roller and the second roller are both arranged at the bottom of the first-level lifting cylinder.

6. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 5 is characterized in that: The first roller rolls along the V-shaped guide rail, and the second roller rolls along the arc-shaped guide rail.

7. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 4 is characterized in that: The lower end of the second-stage lifting cylinder is located in the first-stage lifting cylinder and slides therein, and the lower end of the third-stage lifting cylinder is located in the second-stage lifting cylinder and slides therein.

8. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to any one of claims 1 to 7, characterized in that: The relaxation screen also includes a first mounting seat, a first support column and a second support column; the height of the first support column is smaller than the height of the second support column, and the lower end of the first support column and the lower end of the second support column are both connected to the first mounting seat.

9. The material adaptive screening method based on the material adaptive relaxation device of non-contact measurement according to claim 8 is characterized in that: The upper end of the first supporting column and the upper end of the second supporting column are both connected to the fixing frame.

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