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

Abstract

The invention relates to a material self-adaptive flip-flow device based on non-contact measurement and a screening method, belongs to the technical field of mineral product screening, and solves the problem that a flip-flow screen in the prior art cannot be suitable for characteristics of fed materials. The device comprises a flip-flow screen, a non-contact measuring mechanism and a counterweight adjusting mechanism, the flip-flow screen comprises a fixed frame and a floating frame, and the floating frame is connected with the fixed frame; the balance weight adjusting mechanism comprises a balance weight, and the balance weight is connected with the floating frame. The non-contact measuring mechanism is arranged on one side of the flip-flow screen and used for obtaining the motion characteristics of the fixed frame and the floating frame, and the motion characteristics are used for adjusting the balance weight. The high-efficiency screening device can adapt to the change of characteristics such as treatment capacity, particle size composition, moisture and hardness of different materials, so that high-efficiency screening is realized.

Description

Technical Field

[0001] The 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 screen machine that uses the screen surface made of polyurethane elastic material for relaxation. The flexible screen surface is periodically tensioned and relaxed, and the vibration intensity of the screen surface can reach 50g (1g means 9.8m / s 2 ) to fully loosen and screen the material on the screen surface. Since the flexible screen surface is made of elastic material, the screen holes will deform to a certain extent during the screening process, which reduces the problem of material blocking the holes. In recent years, the relaxation screen has been widely used in the deep screening of mineral resources.

[0003] For vibration detection of screening equipment, contact measurement (vibration test, strain or stress measurement) is mostly used. This measurement method has the following disadvantages: it can only test the area where the sensor is arranged, but cannot measure the entire area, and the measurement range is narrow; the sensor is arranged on the screen surface, and the measured screen surface vibration signal is distorted due to inertia; contact measurement is limited by the installation method and surface contact conditions, and has poor stability and low detection efficiency.

[0004] The working parameters of the relaxation screen are fixed during normal operation, and the working conditions are the same for materials with different characteristics. The relaxation screen does not have an adjustment mechanism for working parameters such as relative amplitude. When the material processing capacity, particle size composition, moisture, hardness and other characteristics change, it cannot be automatically adjusted; when the characteristics of the screening material change significantly, the original vibration working condition can no longer achieve 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 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.

[0009] Furthermore, the lifting assembly also includes a first-stage lifting cylinder, a second-stage lifting cylinder and a third-stage lifting cylinder which are 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 for sliding, and the lower end of the tertiary lifting cylinder is located in the secondary lifting cylinder for sliding.

[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, an upper end of the first supporting column and an upper end of the second supporting column 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, hardness and other characteristics 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 meshed with the rotating seat. One end of the rocker arm passes through the support seat and is connected to the gear, and 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, and 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 also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The 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 components throughout the drawings.

[0022] Figure 1 It is a structural schematic diagram of a material adaptive relaxation device (excluding a counterweight adjustment mechanism) of specific embodiment 1;

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

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

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

[0026] Figure 5 It is a structural schematic diagram of a lifting component for a secondary lifting cylinder in specific embodiment 1;

[0027] Figure 6It 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 the specific embodiment 1;

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

[0029] Figure 8 It is a structural schematic diagram of a rotating seat of specific embodiment 1;

[0030] Fig. 9 It is a structural schematic diagram of a first-stage lifting cylinder of specific embodiment 1;

[0031] Fig.10 This is one of the structural schematic diagrams of the two-stage lifting cylinder of specific embodiment 1;

[0032] Fig.11 This is the second structural schematic diagram of the two-stage lifting cylinder of the specific embodiment 1;

[0033] Fig.12 It is a structural schematic diagram of a three-stage lifting cylinder of specific embodiment 1;

[0034] Fig.13 This is a schematic diagram of the connection structure of the screw rod, the second mounting base and the second motor in specific embodiment 1;

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

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

[0037] Reference numerals:

[0038] 100-relaxation screen; 101-first mounting seat; 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 seat; 202-protection box; 203-industrial camera; 204-lifting assembly; 205-bottom plate; 206-V-shaped guide rail; 207-arc 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 seat; 214-first motor; 215-rotating shaft; 216-annular fixing seat; 217-first arc groove; 218-second arc groove; 219-ball; 220-support seat; 221-gear; 222-swing rod; 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-screw rod; 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 in conjunction with 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 adjusting 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 adjusting mechanism 300 is connected to the floating frame 105.

[0044] Compared with the prior art, the material adaptive relaxation device provided in this embodiment, 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 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 matched with different types of screening materials to adapt to the changes in the processing capacity, particle size composition, moisture content, hardness and other characteristics of different materials, thereby realizing efficient screening, and the non-contact measurement ensures the measurement accuracy.

[0045] like Figure 1 As shown, the relaxation screen 100 includes a first mounting seat 101, a first support column 102 and a second support column 103. The first support column 102 and the second support column 103 are each provided with two, the height of the first support column 102 is less than the height of the second support column 103, and the lower ends of the first support column 102 and the second support column 103 are both connected to the first mounting seat 101.

[0046] like Figure 1 As shown, the relaxation screen 100 also includes a fixed frame 104, a floating frame 105 and a shear spring 106, two first support columns 102 are arranged on both sides of the front end of the fixed frame 104, and two second support columns 103 are arranged on both sides of the rear end of the fixed frame 104, the upper end of the first support column 102 is connected to the front end of the fixed frame 104, the upper end of the second support column 103 is connected to the rear end of the fixed frame 104, the floating frame 105 is connected to the fixed frame 104 through the shear spring 106, and a plurality of shear springs 106 are provided, and shear springs 106 are provided on the upper and lower sides of the floating frame 105.

[0047] Specifically, a slot is provided on the fixed frame 104, the middle 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 provided in the slot and extend from the two outer side walls of the fixed frame 104, two first connecting plates 107 are provided 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. One end of the shear spring 106 is connected to the first connecting plate 107, and the other end is connected to 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] like Figure 1 As shown, the flap screen 100 further includes a flexible screen surface 108 and a vibration motor 109 , wherein the flexible screen surface 108 is disposed on a crossbeam of the floating frame 105 . The vibration motor 109 is connected to the fixed frame 104 via a second connecting plate 110 .

[0049] In this embodiment, the floating frame 105 is connected to the fixed frame 104 through the shear spring 106. Under the action of the vibration motor 109, the floating frame 105 produces 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 relaxation and tension movement of the elastic screen surface gives the material on the screen surface a high ejection intensity, thereby promoting the stratification and screening of the material.

[0050] like 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 needed, the lifting assembly 204 drives the industrial camera 203 to move into the protective box 202.

[0051] like Figure 3 As shown, the guide rail seat 201 includes a bottom plate 205, a V-shaped guide rail 206 and an arc-shaped guide rail 207. The V-shaped guide rail 206 and the arc-shaped guide rail 207 are arranged in parallel on the top of the bottom plate 205 and extend into the inner cavity of the protection box 202, so that the lifting assembly 204 can move the industrial camera 203 into the protection box 202. In this embodiment, the V-shaped guide rail 206 has high guiding accuracy, can be automatically replenished after wear, and is conducive to chip removal. The arc-shaped guide rail 207 is easy to install.

[0052] like Figure 3 As shown, the lifting assembly 204 includes a primary lifting cylinder 208, a secondary lifting cylinder 209 and a tertiary lifting cylinder 210, which are arranged in sequence from bottom to top, the lower part of the secondary lifting cylinder 209 can be lifted and lowered in the primary lifting cylinder 208, the lower part of the tertiary lifting cylinder 210 can be lifted and lowered in the secondary lifting cylinder 209, and the industrial camera 203 is arranged on the top of the tertiary lifting cylinder 210. It should be noted that, according to actual needs, the lifting assembly 204 can also include a quaternary lifting cylinder, a quintuple 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] Combination 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 installed on the rotating shaft 215 and rotates synchronously with the rotating shaft 215. The first motor 214 is installed at 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 ring wall of the annular fixing seat 216 is provided with a first arc groove 217. The outer side wall of the rotating seat 213 is provided with a second arc 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 arc groove 217 and the second arc groove 218. The balls 219 roll in the space between the first arc groove 217 and the second arc groove 218. It should be noted that in order to limit the spacing between the balls 219, a ball bracket (not shown in the figure) is provided between the first arc groove 217 and the second arc groove 218.

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

[0056] Combination Figure 4 , Figure 5 and Figure 6 As shown, the lifting assembly 204 further includes four support seats 220, four gears 221, four swing rods 222 and four support rods 223. The support seats 220 are arranged on the bottom plate of the first-stage lifting cylinder 208. The four support seats 220 are evenly distributed around the annular fixed seat 216. The gears 221 are meshed with the rotating seat 213. It can be understood that the upper part of the rotating seat 213 is provided with teeth meshed with the gears 221. The swing rod 222 is L-shaped, one end of the swing rod 222 passes through the support seat 220 and is connected to the gear 221, and 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, of which there are four groups in total, 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 directions and angles of the four rocker arms 222 are the same, and the swinging directions and angles 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, Fig. 9As shown, a first guide groove 224 is provided on the inner wall of the first-stage lifting cylinder 208. It can be 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 groove 224 is a dovetail groove. 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 , Fig.10 and Fig.11 As shown, a connecting platform 225 is provided at the bottom of the secondary lifting cylinder 209, and connecting columns 226 are provided around the connecting platform 225. The connecting columns 226 are hinged 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 in the first guide groove 224. In order to limit the degree of 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 Fig.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 mounted on the second mounting seat 230, and the second mounting seat 230 is mounted 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 Fig.12 As shown, a second guide rail 232 is provided on the outer wall of the third-stage lifting cylinder 210, and the second guide rail 232 is provided to slide 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 through the second guide rail 232 and the second guide groove 228, the rotational freedom of the third-stage lifting cylinder 210 is limited, and the screw rod 231 rotates to drive 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 moves periodically driven by the cross beams of the fixed frame 104 and the floating frame 105. However, the properties of the screened materials are not stable, so a single ejection intensity cannot guarantee the screening efficiency of materials with different properties. The relaxation movement characteristics of the flexible screen surface 108 depend on the relative movement 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 of 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 arranged on the floating frame 105. An oil storage space is arranged in the counterweight 301. One end of the oil outlet pipe 302 is connected to the oil storage space in the counterweight 301, and the other end is connected to the hydraulic oil pump 305. One end of the oil inlet pipe 303 is connected to the oil storage space in 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 is connected to the hydraulic oil pump 305 and the hydraulic oil tank 304. When a part of the oil in the counterweight 301 is extracted, the weight of the counterweight 301 is reduced. When the oil is delivered to the oil storage space in the counterweight 301, the weight of the counterweight 301 is increased. It can be understood that a one-way solenoid valve 307 is arranged on both the oil outlet pipe 302 and the oil inlet pipe 303.

[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, thereby adjusting 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 controlling 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 embodiment 1 to adaptively screen the material, comprising the following steps:

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

[0068] In order to obtain the movement information of key parts of the screen body such as the side plates of the fixed frame 104 and the side plates of the floating frame 105, marking points are set at the feeding end of the fixed frame 104, the middle end of the fixed frame 104, the discharging end of the fixed frame 104, the feeding end of the floating frame 105, the middle end of the floating frame 105, and the discharging end of the floating frame 105, 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 restricted area processing, use the regionprops function to measure the area of ​​each connected component in the image, and set a region area limit 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. Fig.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, use the loop algorithm to identify each frame of the image, and create an array to store the position information of the center of mass of each frame. After the loop calculation is completed, draw the motion trajectory of the tracking target (center of mass) according to the data in the array. Fig.15 It tracks the motion trajectory of the target within 2 cycles. It can be seen that the trajectory is not a strict ellipse, and each position point has a certain range of fluctuations. This shows that the visual algorithm retains the fluctuations in the actual movement of the screen machine, and 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 mark point at the middle end of the side plate of the fixed frame 104 and the mark point at the middle end 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] The material with the largest on-site production is selected as the test sample, and the counterweight 301 of the floating frame 105 is adjusted to perform a screening test on the test sample to test how large the counterweight 301 is for the best screening effect on the test sample. The comprehensive separation index is selected as the evaluation index. As the relative amplitude increases, the comprehensive separation index should increase first 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, the amplitude range is set as the reasonable working range of the relative motion amplitude of the floating frame 105 and the fixed frame 104.

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

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

[0081] For materials with different processing capabilities: when the amount of materials increases and the processing volume increases, the non-contact measurement mechanism 200 will detect that the relative amplitude is smaller than the reasonable working range, so it is necessary to increase the relative motion amplitude by reducing the counterweight 301 on the floating frame 105 until the relative amplitude is in a reasonable working range, and vice versa when the processing volume decreases.

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

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

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

[0085] By means of the above non-contact method of measuring the relative amplitude and adjusting the relative amplitude by the counterweight 301 on the floating frame 105 , the flap screen 100 can be adapted to different types of screening materials to achieve self-adaptation.

[0086] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A material adaptive relaxation device based on non-contact measurement, characterized in that: The invention comprises a loose-fitting screen (100), a non-contact measuring mechanism (200) and a counterweight adjusting mechanism (300); the loose-fitting screen (100) comprises a fixed frame (104) and a floating frame (105), wherein the floating frame (105) is connected to the fixed frame (104); the counterweight adjusting mechanism (300) comprises a counterweight (301), wherein the counterweight (301) is connected to the floating frame (105); the non-contact measuring mechanism (200) is arranged on one side of the loose-fitting screen (100) and is used to obtain the motion characteristics of the fixed frame (104) and the floating frame (105), wherein the motion characteristics are used to adjust the counterweight (301).

2. The material adaptive relaxation device based on non-contact measurement according to claim 1 is characterized in that: The non-contact measurement mechanism (200) comprises a guide rail seat (201), a protection box (202), an industrial camera (203) and a lifting assembly (204); the protection box (202) is arranged at one end of the guide rail seat (201), the industrial camera (203) is arranged at the top of the lifting assembly (204), and the bottom of the lifting assembly (204) moves along the guide rail seat (201).

3. The material adaptive relaxation device based on non-contact measurement according to claim 2 is characterized in that: The guide rail seat (201) comprises a bottom plate (205), a V-shaped guide rail (206) and an arc-shaped guide rail (207); the protection box (202) is arranged on the bottom plate (205), and the V-shaped guide rail (206) and the arc-shaped guide rail (207) are arranged in parallel on the top of the bottom plate (205).

4. The material adaptive relaxation device based on non-contact measurement according to claim 3 is characterized in that: The lifting assembly (204) further comprises a first-stage lifting cylinder (208), a second-stage lifting cylinder (209) and a third-stage lifting cylinder (210) which are arranged in sequence from bottom to top, and the industrial camera (203) is arranged on the top of the third-stage lifting cylinder (210).

5. The material adaptive relaxation device based on non-contact measurement according to claim 4 is characterized in that: The lifting assembly (204) further comprises a first roller (211) and a second roller (212), wherein the first roller (211) and the second roller (212) are both arranged at the bottom of the first-level lifting cylinder (208).

6. The material adaptive relaxation device based on non-contact measurement according to claim 5 is characterized in that: The first roller (211) rolls along the V-shaped guide rail (206), and the second roller (212) rolls along the arc-shaped guide rail (207).

7. The material adaptive relaxation device based on non-contact measurement according to claim 4 is characterized in that: The lower end of the secondary lifting cylinder (209) is located in the primary lifting cylinder (208) and slides therein, and the lower end of the tertiary lifting cylinder (210) is located in the secondary lifting cylinder (209) and slides therein.

8. The material adaptive relaxation device based on non-contact measurement according to any one of claims 1 to 7, characterized in that: The relaxation screen (100) further comprises a first mounting seat (101), a first support column (102) and a second support column (103); the height of the first support column (102) is smaller than the height of the second support column (103), and the lower end of the first support column (102) and the lower end of the second support column (103) are both connected to the first mounting seat (101).

9. The material adaptive relaxation device based on non-contact measurement according to claim 8, characterized in that: The upper end of the first supporting column (102) and the upper end of the second supporting column (103) are both connected to the fixing frame (104).

10. A material adaptive screening method, characterized in that: The material adaptive relaxation device described in any one of claims 1 to 9 is used to perform adaptive screening of the material.

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