A multi-section flexible support composite flip-flow screen and a method of regulating

Abstract

The present application relates to flip-flop screen technical field, disclose a kind of multistage flexible support composite flip-flop screen and regulation and control method, including side tank board, further comprising: screen cloth;With the fixed frame and movable frame connected with screen cloth;The movable frame is equipped with excitation mechanism, and the excitation mechanism includes support piece, one side of the support piece is slidably provided with counterweight, the other side of the support piece is slidably provided with multiple equidistantly distributed sliders, the sum of centrifugal force generated by multiple sliders is different when the support piece is at different rotational speeds, and the counterweight is driven to be at different positions.The present application is provided with slider and counterweight by setting excitation mechanism, and the centrifugal force generated by equidistantly configured slider is offset, and the centrifugal force can act on the counterweight to adjust its position, when excitation mechanism adjusts vibration frequency by changing the rotational speed of support piece, the position of counterweight changes to adjust vibration amplitude.

Description

Technical Field

[0001] This invention belongs to the field of tension sieve technology, specifically, it relates to a multi-segment flexible support composite tension sieve and its control method. Background Technology

[0002] The tension screen is a high-efficiency dry screening equipment designed specifically for wet, sticky, fine-grained, and easily clogged materials. Its core advantage is that it achieves high acceleration and self-cleaning by repeatedly tensioning and relaxing the screen surface, thus solving the problem of screen clogging in traditional vibrating screens.

[0003] Existing tension screens cannot adjust vibration according to the volume distribution of materials. Since large and small volume materials are different, large volume materials require high vibration amplitude to disperse the material, while small volume materials require low vibration amplitude to prevent the material from being ejected too high and not making sufficient contact with the screen. Existing tension screens can only adjust the vibration as a whole and cannot adjust the vibration frequency and vibration amplitude at the same time.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a multi-segment flexible support composite tension screen and its control method. By configuring a slider and a counterweight in the excitation mechanism, with the sliders spaced at equal intervals to cancel each other out in centrifugal forces, and allowing the centrifugal force to act on the counterweight to adjust its position, the excitation mechanism adjusts the vibration frequency by changing the rotational speed of the support component. The counterweight position changes accordingly to adjust the vibration amplitude. By generating low-frequency, high-amplitude vibrations at large-volume materials, the large-volume materials are quickly dispersed, while high-frequency, low-amplitude vibrations are generated at small-volume materials, accelerating screening while preventing small-volume materials from becoming stagnant and failing to fully contact the screen surface.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A multi-segment flexible-supported composite tension screen includes side panels and further includes:

[0008] sieve;

[0009] Fixed frame and movable frame connected to the screen;

[0010] The movable frame is equipped with a vibration mechanism, which includes a support member. A counterweight is slidably arranged on one side of the support member, and multiple equally spaced sliders are slidably arranged on the other side of the support member. When the support member is at different rotation speeds, the sum of the centrifugal forces generated by the multiple sliders is different, which drives the counterweight to different positions.

[0011] In a preferred embodiment of the present invention, a fixing ring and a fixing ring are fixedly installed on one side of the support member, a fixing rod is fixedly installed between the fixing ring and the fixing ring, the counterweight is movably sleeved on the fixing rod, and a second spring is movably sleeved on the fixing rod. The elastic force of the second spring acts on the counterweight and causes it to be pushed.

[0012] In a preferred embodiment of the present invention, a groove is provided on the other side of the support member, and a sliding rod is installed inside the groove of the support member. The slider is slidably connected to the sliding rod. The multiple sliders have the same volume and mass and are arranged in a circular array about the center of the support member. The friction between the slider and the sliding rod is greater than the weight of the slider itself.

[0013] In a preferred embodiment of the present invention, a first through hole is provided on the support member, a second through hole is provided on the fixing ring, and a pull rope is installed between the counterweight and the multiple sliders. The pull rope passes through the first through hole and the second through hole, and the mass of the counterweight is less than the sum of the masses of the multiple sliders.

[0014] In a preferred embodiment of the present invention, a fixing plate is fixedly installed on one side of the side panel, the fixing frame is fixedly connected to the fixing plate, a support rod is fixedly installed on the fixing plate, a sleeve is movably sleeved on the support rod, a first spring is also movably sleeved on the support rod, one end of the first spring abuts against the sleeve, the sleeve is fixedly connected to the movable frame, motors are installed at both ends of the movable frame, a support plate is installed at the output end of the motor, and the support plate is fixedly connected to the support member.

[0015] A control method for controlling the frequency of an excitation mechanism, the control method comprising:

[0016] Step 1: Divide the screen into N independent screening zones along the conveying direction, and define the material particle size boundary threshold and vibration parameter linkage mapping rule for each screening zone. The vibration parameter linkage mapping rule is that the vibration frequency in the screening zone is negatively correlated with the real-time proportion of large-volume materials in that screening zone.

[0017] Step 2: Collect material status data for each screening zone in real time, and calculate the real-time proportion of large-volume materials with a particle size greater than the material particle size boundary threshold and the real-time proportion of small-volume materials with a particle size less than or equal to the material particle size boundary threshold within the corresponding screening zone based on the material status data.

[0018] Step 3: For each independent screening zone, input the real-time proportion of the currently detected large volume material into the preset vibration parameter linkage mapping rule, calculate the target vibration frequency in the corresponding screening zone, and output control commands to the excitation mechanism of the corresponding screening zone.

[0019] In a preferred embodiment of the present invention, step two, the step of obtaining material state data, is as follows:

[0020] The top-view material image of the screen surface of each screening section is acquired. The acquired top-view material images are then subjected to noise reduction, distortion correction, and screen surface background segmentation processing to separate the material foreground region.

[0021] Connectivity identification and labeling of the foreground region of the material, calculation of the equivalent particle size and projected area of ​​each connected region, and classification and statistics of large-volume and small-volume materials in all connected regions based on the preset material particle size boundary threshold.

[0022] Based on the classification statistics, the real-time proportion of large-volume materials in the corresponding screening area is calculated, and the real-time proportion of small-volume materials is calculated simultaneously.

[0023] As a preferred embodiment of the present invention, step three also includes a feedback correction strategy for vibration frequency: the actual vibration frequency of the excitation mechanism of each screening section is collected in real time, the actual vibration frequency is compared with the calculated target vibration frequency, the frequency deviation value is calculated, and the excitation mechanism is corrected in real time based on the frequency deviation value, so that the actual vibration frequency of the excitation mechanism quickly converges to the target vibration frequency.

[0024] In a preferred embodiment of the present invention, an upper limit threshold and a lower limit threshold are preset for the vibration frequency of the excitation mechanism. If the calculated target vibration frequency exceeds the upper limit threshold or the lower limit threshold, the calculated target vibration frequency is automatically discarded, and the upper limit threshold or the lower limit threshold that is close to it is used as the new target vibration frequency.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] This invention sets up a slider and a counterweight in the excitation mechanism, and the sliders are arranged at equal intervals so that the centrifugal forces they generate cancel each other out. The centrifugal force can act on the counterweight to adjust its position. When the excitation mechanism adjusts the vibration frequency by changing the rotation speed of the support, the position of the counterweight changes accordingly to adjust the vibration amplitude.

[0027] This invention generates low-frequency, high-amplitude vibrations at the large volume of material to quickly disperse it, and high-frequency, low-amplitude vibrations at the small volume of material to accelerate screening while preventing the small volume of material from lingering in the air and failing to fully contact the screen surface. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the multi-segment flexible support composite tension screen of the present invention;

[0029] Figure 2 This is a schematic diagram of the bottom structure of the screen of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure at the support rod of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the motor in this invention;

[0032] Figure 5 This is a schematic diagram of the structure of the counterweight block in this invention;

[0033] Figure 6 This is a schematic diagram of the slider structure of the present invention.

[0034] Figure label:

[0035] 100. Side panel; 101. Fixing plate; 102. Fixing frame; 103. Movable frame; 104. Screen; 105. Sleeve; 106. Support rod; 107. First spring; 108. Motor;

[0036] 200. Support plate; 201. Support component; 202. Groove; 203. Slide rod; 204. Slider; 205. Pull rope; 206. First through hole; 207. Second through hole; 208. Counterweight; 209. Fixing rod; 210. Fixing ring; 211. Fixing ring; 212. Second spring. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0038] Example 1:

[0039] like Figures 1 to 6 As shown, a multi-segment flexible-supported composite tension screen includes a side box plate 100, and further includes:

[0040] 104 mesh size;

[0041] Fixed frame 102 and movable frame 103 connected to screen 104;

[0042] A vibration mechanism is installed on the movable frame 103. The vibration mechanism includes a support member 201. A counterweight 208 is slidably arranged on one side of the support member 201, and multiple equally spaced sliders 204 are slidably arranged on the other side of the support member 201. When the support member 201 is at different rotation speeds, the sum of the centrifugal forces generated by the multiple sliders 204 is different, which drives the counterweight 208 to different positions.

[0043] like Figures 4 to 6As shown, in a specific embodiment, a fixing ring 210 and a fixing ring 211 are fixedly installed on one side of the support member 201. A fixing rod 209 is fixedly installed between the fixing ring 210 and the fixing ring 211. A counterweight 208 is movably sleeved on the fixing rod 209. A second spring 212 is movably sleeved on the fixing rod 209. The elastic force of the second spring 212 acts on the counterweight 208, causing it to be pushed. In this configuration, the counterweight 208 slides along the fixing rod 209 and maintains synchronous rotation with the support member 201. When the counterweight 208 moves towards the edge of the support member 201, the centrifugal force generated by the counterweight 208 increases, causing the support member 201 to produce a larger vibration amplitude. When the counterweight 208 moves towards the center of the support member 201, the centrifugal force generated by the counterweight 208 decreases, causing the vibration amplitude of the support member 201 to decrease.

[0044] like Figures 4 to 6 As shown, further, a groove 202 is provided on the other side of the support member 201. A slide rod 203 is installed inside the groove 202 on the support member 201. Slider 204 is slidably connected to the slide rod 203. The multiple sliders 204 have the same volume and mass and are arranged in a circular array about the center of the support member 201. The friction between the slider 204 and the slide rod 203 is greater than the weight of the slider 204 itself. In this configuration, when the multiple sliders 204 rotate with the support member 201, the centrifugal forces generated cancel each other out, so that the support member 201 will not be subjected to vibration caused by the centrifugal force of the sliders 204. The friction is slightly greater than the weight of the sliders 204 themselves.

[0045] like Figures 5 to 6 As shown, further, the support member 201 has a first through hole 206, and the fixing ring 211 has a second through hole 207. A pull rope 205 is installed between the counterweight 208 and the multiple sliders 204, passing through the first through hole 206 and the second through hole 207. The mass of the counterweight 208 is less than the sum of the masses of the multiple sliders 204. In this configuration, when the support member 201 rotates, the centrifugal force generated by the multiple sliders 204 is greater than the centrifugal force of the counterweight 208. When the rotational speed increases, the centrifugal force generated by the multiple sliders 204 overcomes the centrifugal force of the counterweight 208 and the elastic force of the second spring 212, thereby driving the counterweight 208 to move towards the center position of the support member 201.

[0046] like Figures 2 to 3As shown, further, a fixing plate 101 is fixedly installed on one side of the side panel 100, and a fixing frame 102 is fixedly connected to the fixing plate 101. A support rod 106 is fixedly installed on the fixing plate 101, and a sleeve 105 is movably sleeved on the support rod 106. A first spring 107 is also movably sleeved on the support rod 106. One end of the first spring 107 abuts against the sleeve 105. The sleeve 105 is fixedly connected to the movable frame 103. Motors 108 are installed at both ends of the movable frame 103. A support plate 200 is installed at the output end of the motor 108, and the support plate 200 is fixedly connected to the support member 201. In this configuration, the first spring 107 can be used to absorb some vibration and reduce its impact on the overall equipment. At the same time, the first spring 107 applies a reset force to the sleeve 105, reducing the burden on the vibration excitation mechanism to drive the sleeve 105 to reset.

[0047] The implementation principle of a multi-segment flexible support composite tension screen in this embodiment is as follows: During operation, the motor 108 drives the support plate 200 to rotate, the support plate 200 drives the support member 201 connected to it to rotate, the support member 201 drives the counterweight block 208 connected to it to rotate, and under the eccentric setting of the counterweight block 208, the support member 201 vibrates as a whole, which drives the motor 108 to vibrate, and then drives the movable frame 103 to vibrate, and the movable frame 103 drives the screen 104 to vibrate, thereby vibrating and screening the material on it.

[0048] When the speed of the motor 108 changes, the rotation speed of the support 201 also changes. When the rotation speed of the support 201 decreases, the rotation speed of the counterweight 208 decreases, which in turn reduces the vibration frequency. At the same time, because the rotation speed of the support 201 decreases, the centrifugal force generated by the slider 204 on one side decreases. At this time, the elastic force of the second spring 212 acts on the counterweight 208 and causes the counterweight 208 to move towards the edge of the support 201. At this time, the vibration amplitude generated by the rotation of the counterweight 208 is larger, which can better crush large-volume materials.

[0049] When the rotation speed of the support 201 increases, the rotation speed of the counterweight 208 increases, which increases the vibration frequency and the centrifugal force generated by the slider 204. The counterweight 208 is pulled towards the center of the support 201 by the pull rope 205. At this time, the vibration amplitude generated by the rotation of the counterweight 208 is smaller, which accelerates the screening while avoiding small volume materials from being stuck in the air due to excessive vibration amplitude.

[0050] Example 2:

[0051] A control method for controlling the frequency of an excitation mechanism, the control method comprising:

[0052] Step 1: Divide the screen 104 into N independent screening sections along the conveying direction. For each screening section, preset the material particle size boundary threshold and vibration parameter linkage mapping rule. The vibration parameter linkage mapping rule is: the vibration frequency in the screening section is negatively correlated with the real-time proportion of large volume materials in the screening section.

[0053] When the particle size of a material is greater than the particle size boundary threshold, it is determined to be a large-volume material; when the particle size of a material is less than or equal to the particle size boundary threshold, it is determined to be a small-volume material.

[0054] The material particle size boundary threshold is set based on the ratio of the material particle size to the aperture of the screen 104. In this setting, the material particle size boundary threshold is twice the aperture of the screen 104.

[0055] Step 2: Collect material status data for each screening zone in real time, and calculate the real-time proportion of large-volume materials with a particle size greater than the material particle size boundary threshold and the real-time proportion of small-volume materials with a particle size less than or equal to the material particle size boundary threshold within the corresponding screening zone based on the material status data.

[0056] Step 3: For each independent screening zone, input the real-time proportion of the currently detected large volume material into the preset vibration parameter linkage mapping rule, calculate the target vibration frequency in the corresponding screening zone, and output control commands to the excitation mechanism of the corresponding screening zone.

[0057] In step two, the steps for obtaining material status data are as follows:

[0058] The top-view material image of the screen surface of each screening section is acquired. The acquired top-view material images are then subjected to noise reduction, distortion correction, and screen surface background segmentation processing to separate the material foreground region.

[0059] Connectivity identification and labeling of the foreground region of the material, calculation of the equivalent particle size and projected area of ​​each connected region, and classification and statistics of large-volume and small-volume materials in all connected regions based on the preset material particle size boundary threshold.

[0060] Based on the classification statistics, the area ratio of large-volume materials in the corresponding screening area is calculated as the real-time ratio of large-volume materials, and the real-time ratio of small-volume materials is calculated simultaneously.

[0061] For each independent screening zone, a non-contact detection method is used to collect material status data of the corresponding screening zone in real time. The collection area must completely cover the entire screening surface of the corresponding screening zone, with no blind spots and no signal overlap between adjacent screening zones. The collection frequency is matched with the material conveying speed and the vibration frequency of the excitation mechanism to ensure that the collected material status data can accurately reflect the real-time distribution of materials in the current screening zone and avoid data distortion caused by material movement and screen vibration.

[0062] Step three also includes a feedback correction strategy for vibration frequency: the actual vibration frequency of the excitation mechanism of each screening section is collected in real time, the actual vibration frequency is compared with the calculated target vibration frequency, the frequency deviation value is calculated, and the excitation mechanism is corrected in real time based on the frequency deviation value, so that the actual vibration frequency of the excitation mechanism quickly converges to the target vibration frequency.

[0063] The frequency deviation value is the difference between the actual vibration frequency and the target vibration frequency. When the frequency deviation value is positive, it indicates that the actual vibration frequency is greater than the target vibration frequency, and the actual vibration frequency needs to be reduced. When the frequency deviation value is negative, it indicates that the actual vibration frequency is less than the target vibration frequency, and the actual vibration frequency needs to be increased.

[0064] In step one, an upper limit threshold and a lower limit threshold are preset for the vibration frequency of the excitation mechanism. When the calculated target vibration frequency exceeds the upper limit threshold or the lower limit threshold, the calculated target vibration frequency is automatically discarded, and the upper limit threshold or the lower limit threshold that is close to it is used as the new target vibration frequency.

[0065] Setting upper and lower threshold values ​​for the vibration frequency of the excitation mechanism can prevent excessively high vibration frequencies or amplitudes from damaging the excitation mechanism and prevent it from failing to operate safely and for a long time.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-segment flexible support composite tension screen, comprising side box plates (100), characterized in that, Also includes: Screen (104); Fixed frame (102) and movable frame (103) connected to screen (104); The active frame (103) is equipped with a vibration mechanism, which includes a support member (201). A counterweight (208) is slidably arranged on one side of the support member (201), and multiple equally spaced sliders (204) are slidably arranged on the other side of the support member (201). When the support member (201) is at different rotation speeds, the sum of the centrifugal forces generated by the multiple sliders (204) is different, and they drive the counterweight (208) to different positions. A fixing ring (210) and a fixing ring (211) are fixedly installed on one side of the support member (201). A fixing rod (209) is fixedly installed between the fixing ring (210) and the fixing ring (211). The counterweight (208) is movably sleeved on the fixing rod (209). A second spring (212) is movably sleeved on the fixing rod (209). The elastic force of the second spring (212) acts on the counterweight (208) and causes it to be pushed.

2. The composite tension screen with multi-segment flexible support according to claim 1, characterized in that, The support member (201) has a groove (202) on the other side. A slide rod (203) is installed inside the groove (202) of the support member (201). The slider (204) is slidably connected to the slide rod (203). The multiple sliders (204) have the same volume and mass and are arranged in a circular array about the center of the support member (201). The friction between the slider (204) and the slide rod (203) is greater than the weight of the slider (204) itself.

3. The composite tension screen with multi-segment flexible support according to claim 2, characterized in that, The support member (201) has a first through hole (206), the fixing ring (211) has a second through hole (207), and a pull rope (205) is installed between the counterweight (208) and the multiple sliders (204). The pull rope (205) passes through the first through hole (206) and the second through hole (207). The mass of the counterweight (208) is less than the sum of the masses of the multiple sliders (204).

4. The multi-segment flexible support composite tension screen according to claim 3, characterized in that, A fixing plate (101) is fixedly installed on one side of the side panel (100). The fixing frame (102) is fixedly connected to the fixing plate (101). A support rod (106) is fixedly installed on the fixing plate (101). A sleeve (105) is movably sleeved on the support rod (106). A first spring (107) is also movably sleeved on the support rod (106). One end of the first spring (107) abuts against the sleeve (105). The sleeve (105) is fixedly connected to the movable frame (103). A motor (108) is installed at both ends of the movable frame (103). A support plate (200) is installed at the output end of the motor (108). The support plate (200) is fixedly connected to the support member (201).

5. A control method for controlling the frequency of the excitation mechanism of the multi-segment flexible-supported composite tension screen as described in claim 1, characterized in that, The control method includes: Step 1: Divide the screen (104) into N independent screening sections along the conveying direction, and preset the material particle size boundary threshold and vibration parameter linkage mapping rule for each screening section. The vibration parameter linkage mapping rule is: the vibration frequency in the screening section is negatively correlated with the real-time proportion of large volume material in the screening section. Step 2: Collect material status data for each screening zone in real time, and calculate the real-time proportion of large-volume materials with a particle size greater than the material particle size boundary threshold and the real-time proportion of small-volume materials with a particle size less than or equal to the material particle size boundary threshold within the corresponding screening zone based on the material status data. Step 3: For each independent screening zone, input the real-time proportion of the currently detected large volume material into the preset vibration parameter linkage mapping rule, calculate the target vibration frequency in the corresponding screening zone, and output control commands to the excitation mechanism of the corresponding screening zone.

6. The control method according to claim 5, characterized in that, In step two, the steps for obtaining material status data are as follows: The top-view material image of the screen surface of each screening section is acquired. The acquired top-view material images are then subjected to noise reduction, distortion correction, and screen surface background segmentation processing to separate the material foreground region. Connectivity identification and labeling of the foreground region of the material, calculation of the equivalent particle size and projected area of ​​each connected region, and classification and statistics of large-volume and small-volume materials in all connected regions based on the preset material particle size boundary threshold. Based on the classification statistics, the real-time proportion of large-volume materials in the corresponding screening area is calculated, and the real-time proportion of small-volume materials is calculated simultaneously.

7. The control method according to claim 6, characterized in that, Step three also includes a feedback correction strategy for vibration frequency: the actual vibration frequency of the excitation mechanism of each screening section is collected in real time, the actual vibration frequency is compared with the calculated target vibration frequency, the frequency deviation value is calculated, and the excitation mechanism is corrected in real time based on the frequency deviation value.

8. The control method according to claim 7, characterized in that, In step one, an upper limit threshold and a lower limit threshold are preset for the vibration frequency of the excitation mechanism. If the calculated target vibration frequency exceeds the upper limit threshold or the lower limit threshold, the calculated target vibration frequency is automatically discarded, and the upper limit threshold or the lower limit threshold that is close to it is used as the new target vibration frequency.

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