Multi-point synchronous excitation device for vibrating screen and motion stability control method of multi-point synchronous excitation device

Abstract

The invention discloses a multi-point synchronous excitation device for a vibrating screen and a motion stability control method of the multi-point synchronous excitation device, and relates to the technical field of vibrating screens, the multi-point synchronous excitation device comprises an excitation main body, a vibrating screen body is arranged on the top surface of the excitation main body, a control module is loaded on the excitation main body, a pressure sensor is mounted on the vibrating screen body, and at least four groups of vibration motors are mounted on the bottom surface of the excitation main body; limiting mechanisms are installed at the two ends of the vibration excitation body and used for adjusting the vibration amplitude and vibration resistance of the vibration excitation body, the bottoms of the limiting mechanisms are rotationally connected with supporting columns, the bottom ends of the supporting columns are connected with telescopic columns, and a control module collects pressure data through a pressure sensor and controls the position and power of a vibration motor based on the pressure data. The vibration resistance can counteract the acting force of the vibration excitation body in the horizontal direction, it is guaranteed that vibration of the vibration excitation body is more stable, the four sets of vibration motors enable the vibration excitation body to generate uniform vibration, and the material screening effect of the vibration screen body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vibrating screens, and in particular to a multi-point synchronous excitation device for a vibrating screen and a motion stability control method thereof. Background Art

[0002] The multi-point synchronous excitation vibrating screen is a device used to separate and screen materials. It uses multiple excitation points to work synchronously to achieve efficient material screening. The multi-point synchronous excitation vibrating screen generates vibrations at different positions of the screen through multiple exciters. Each exciter works synchronously, so that the entire screen produces uniform vibrations, which promotes the movement and separation of materials. It requires a reasonable arrangement of the position and number of exciters to ensure the uniformity and symmetry of the vibration. Existing multi-point synchronous excitation vibrating screens, for example, a multi-point excitation vibrating screen disclosed in the patent with publication number CN107335604A, mainly includes a vibrator used as a vibration source and a screen for screening materials. The chassis is installed on the ground by bolts, and four vibrators are evenly distributed and installed on the outer circle edge of the chassis. The vibrating head on the vibrator is not fixed in contact with the screen. Although the multi-point excitation vibrating screen can provide a multi-point synchronous excitation vibrating screen, due to inevitable mechanical fatigue, the vibration frequency and vibration amplitude generated by the four vibrators will deviate, resulting in uneven vibration generated by the multi-point synchronous excitation vibrating screen, which greatly reduces the screening effect of the multi-point synchronous excitation vibrating screen and affects the mechanical life of the multi-point synchronous excitation vibrating screen. Summary of the invention

[0003] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a multi-point synchronous excitation device for a vibrating screen and a motion stability control method thereof, so as to solve the problem in the prior art that due to inevitable mechanical fatigue, the vibration frequency and vibration amplitude generated by the four exciters working for a long time will deviate, resulting in uneven vibration generated by the multi-point synchronous excitation vibrating screen, reducing the screening effect of the multi-point synchronous excitation vibrating screen and affecting the mechanical life of the multi-point synchronous excitation vibrating screen.

[0004] The purpose of the present invention can be achieved by the following technical solutions: The first aspect of the present invention is to provide a multi-point synchronous excitation device for a vibrating screen, including an excitation body, a vibrating screen body is arranged on the top surface of the excitation body, a control module is loaded on the excitation body, a pressure sensor is installed on the vibrating screen body, at least four groups of vibration motors are installed on the bottom surface of the excitation body, and limiting mechanisms are installed at both ends of the excitation body for adjusting the vibration amplitude and vibration resistance of the excitation body. The bottom of the limiting mechanism is rotatably connected to a support column, and the bottom end of the support column is connected to a telescopic column. The control module collects pressure data through the pressure sensor and controls the power of the vibration motor based on the pressure data.

[0005] As a further solution of the present invention: the excitation body includes a vibration plate, movable tracks are opened on both sides of the bottom surface of the vibration plate, screws are installed on the inner side of the movable track through bearings, and drive motors are bolted to the middle positions of both sides of the vibration plate, and the drive motors are used to drive the screws.

[0006] As a further solution of the present invention: a first hydraulic cylinder is arranged at the inner middle position of the movable track, and an output end of the first hydraulic cylinder is connected to a conversion mechanism through a hydraulic rod.

[0007] As a further solution of the present invention: the conversion mechanism includes a mechanism body, bearing seats are installed at both ends of the mechanism body, a movable connecting rod is inserted into the inner side of the bearing seat, the end of the movable connecting rod close to the screw is slidingly connected to the screw, the end of the movable connecting rod away from the screw is fixedly connected to the driven gear, the output shaft of the drive motor is fixedly connected to the driving gear, and the driving gear is matched with the driven gear.

[0008] As a further solution of the present invention: the vibration motor includes a motor body, a moving slider is fixedly connected to the side of the motor body, an eccentric wheel is fixedly connected to the output shaft of the motor body, a nut slider is arranged on the inner side of the moving slider, the nut slider matches the screw rod, and the moving slider matches the moving track.

[0009] As a further solution of the present invention: an adjustment track is opened inside the movable slider, an adjustment slider matching the adjustment track is fixedly connected to the side of the nut slider, a second hydraulic cylinder is fixedly connected to the end of the motor body away from the eccentric wheel, and the output end of the second hydraulic cylinder is fixedly connected to one end face of the adjustment slider through a hydraulic rod.

[0010] As a further solution of the present invention: the limiting mechanism includes a rotating seat, one end of which is fixedly connected to a limiting rod, a vibration spring is embedded in the side of the limiting rod, and a first vibration cavity and a second vibration cavity that match the limiting rod are opened inside the vibration plate.

[0011] As a further solution of the present invention: the first vibration chamber is connected to a first cylinder via a pipeline, and the second vibration chamber is connected to a second cylinder via a pipeline.

[0012] As a further solution of the present invention: the bottom end of the support column is connected to a telescopic column, the bottom surface of the telescopic column is fixedly connected to a support foot, the outer side of the support foot is fixedly connected to a first support plate and a second support plate, and the first support plate and the second support plate are slidably connected.

[0013] The second aspect of the present invention is to provide a motion stability control method for a multi-point synchronous excitation device for a vibrating screen, comprising the following steps: S1: The control module adjusts the vibration resistance of the excitation body according to the tilt angle of the excitation body; S2: The control module collects pressure data through the pressure sensor; S3: Based on the pressure data collected by the pressure sensor, the control module controls the power of the vibration motor; S4: An amplitude sensor is installed on the vibrating screen body, and the control module collects amplitude data through the amplitude sensor; S5: Based on the amplitude data collected by the amplitude sensor, the control module controls the position of the vibration motor.

[0014] Beneficial effects of the present invention: 1. In the present invention, the vibration resistance of the exciting body is adjusted according to the inclination angle of the exciting body through the setting of the limiting mechanism, so that the vibration resistance can offset the horizontal force of the exciting body, thereby ensuring that the vibration of the exciting body is more stable, and then the preset power of the four groups of vibration motors is adjusted according to the feeding speed of the material. Finally, the material can be transported to the top surface of the vibrating screen body, and the four groups of vibration motors are turned on at the same time. The four groups of vibration motors will make the exciting body vibrate evenly, thereby improving the effect of the vibrating screen body in screening materials.

[0015] 2. In the present invention, the output end of the second hydraulic cylinder will drive the adjusting slider through the hydraulic rod. Since the adjusting slider is fixedly connected to the side of the nut slider, and the second hydraulic cylinder is fixedly connected to the end of the motor body away from the eccentric wheel, the adjusting slider will react on the second hydraulic cylinder through the hydraulic rod, so that the second hydraulic cylinder drives the motor body to calibrate the position of the motor body, that is, to calibrate the position of the eccentric wheel, thereby greatly improving the accuracy of the eccentric wheel position.

[0016] 3. In the present invention, when the excitation body is horizontal, the distance between the support columns at both ends of the excitation body is the largest. When the excitation body is in an inclined state, the distance between the support columns at both ends of the excitation body will gradually decrease with the increase of the inclination angle. Therefore, the sliding connection between the first support plate and the second support plate can ensure that the distance between the support columns at both ends of the excitation body can be adaptively adjusted to ensure the supporting effect of the support columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a schematic structural diagram of a multi-point synchronous excitation device for a vibrating screen according to the present invention; Figure 2 This is a front view of the multi-point synchronous excitation device for the vibrating screen of the present invention; Figure 3 It is a bottom view of the vibration exciting body in the present invention; Figure 4 yes Figure 3 A partial enlarged view of the middle A; Figure 5 It is a front view of the conversion mechanism in the present invention; Figure 6 It is a structural schematic diagram of the vibration motor in the present invention; Figure 7 is a partial cross-sectional view of the vibration motor of the present invention; Figure 8 It is a schematic diagram of the internal structure of the limiting mechanism in the present invention; Fig. 9 It is a structural schematic diagram of the rotating seat in the present invention.

[0018] Figure numerals: 1, excitation body; 11, vibration plate; 12, moving track; 13, limiting track; 14, screw; 15, driving motor; 151, driving gear; 16, first hydraulic cylinder; 17, conversion mechanism; 171, mechanism body; 172, bearing seat; 173, moving connecting rod; 174, driven gear; 18, slide rail; 2, vibration motor; 21, motor body; 22, eccentric wheel; 23, moving slider; 24, nut slider; 25, second hydraulic cylinder; 26, adjustment Section track; 27, adjusting slider; 3, vibrating screen body; 4, limiting mechanism; 41, rotating seat; 411, moving block; 412, rotating shaft block; 413, connecting sleeve; 414, connecting ball; 415, first telescopic rod; 416, second telescopic rod; 42, limiting rod; 43, vibration spring; 44, first vibration chamber; 45, first cylinder; 46, second vibration chamber; 47, second cylinder; 5, supporting column; 6, telescopic column; 7, supporting foot; 8, first support plate; 9, second support plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] like Figure 1-Figure 9As shown, the present invention discloses a multi-point synchronous excitation device for a vibrating screen, including an excitation main body 1, a vibrating screen body 3 is arranged on the top surface thereof, a control module is loaded on the excitation main body 1, specifically, a microprocessor is loaded on the excitation main body 1, and the control module can be loaded on the microprocessor, a pressure sensor is installed on the vibrating screen body 3, specifically, a pressure sensor is installed at each of the four corners and the center of the vibrating screen body 3, and the pressure sensor can directly collect the pressure value of the material falling on the vibrating screen body 3. It should also be noted that the vibrating screen body 3 includes an outer frame and a screen mesh, and the number and specifications of the outer frame and the screen mesh are adaptively selected by those skilled in the art according to the material to be screened, and at least four groups of vibration motors 2 are installed on the bottom surface of the excitation main body 1 to Figure 1 and Figure 3 For example, four groups of vibration motors 2 are installed. The four groups of vibration motors 2 are installed at the four corners of the bottom surface of the exciting body 1. Limiting mechanisms 4 are installed at both ends of the exciting body 1 to adjust the vibration resistance of the exciting body 1. It should be noted that when the exciting body 1 is placed horizontally, there is no need to control the vibration resistance of the exciting body 1. When the exciting body 1 is placed at an angle, it is necessary to control the vibration resistance of the exciting body 1 so that the vibration resistance can offset the horizontal force of the exciting body 1 to ensure that the vibration of the exciting body 1 is more stable. The bottom of the limiting mechanism 4 is rotatably connected to a support column 5, and the bottom end of the support column 5 is connected to a telescopic column 6. The control module collects pressure data through a pressure sensor and controls the power of the vibration motor 2 based on the pressure data.

[0022] Specifically, when the vibrating screen is used to screen materials with a multi-point synchronous excitation device, the inclination angle of the excitation body 1 can be adjusted according to the nature and specifications of the material, and the vibration resistance of the excitation body 1 can be adjusted according to the inclination angle of the excitation body 1, so that the vibration resistance can offset the horizontal force of the excitation body 1, thereby ensuring that the vibration of the excitation body 1 is more stable, and then the preset power of the four groups of vibration motors 2 is adjusted according to the feeding speed of the material. Finally, the material can be transported to the top surface of the vibrating screen body 3, and the four groups of vibration motors 2 are turned on at the same time. The four groups of vibration motors 2 will cause the excitation body 1 to vibrate uniformly, thereby ensuring that the material can complete the screening operation on the top surface of the vibrating screen body 3.

[0023] like Figure 3 and Figure 4As shown, the excitation body 1 includes a vibration plate 11, and movable tracks 12 are opened on both sides of the bottom surface of the vibration plate 11. The movable tracks 12 are symmetrically arranged on the bottom surface of the vibration plate 11. Screws 14 are installed on the inner side of the movable track 12 through bearings. The number of screws 14 is four, and the four screws 14 are symmetrically arranged in the movable track 12 opened on both sides of the bottom surface of the vibration plate 11. A driving motor 15 is bolted to the middle position of both sides of the vibration plate 11. The driving motor 15 is used to drive the screw 14. A first hydraulic cylinder 16 is arranged in the middle position inside the movable track 12, and the output end of the first hydraulic cylinder 16 is connected to a conversion mechanism 17 through a hydraulic rod.

[0024] When in use, the drive motor 15 is turned on, and the power of the drive motor 15 is transmitted to the screw 14 through the conversion mechanism 17, driving the screw 14 to rotate. It should be noted that when the first hydraulic cylinder 16 is turned on, the output end of the first hydraulic cylinder 16 can drive the conversion mechanism 17 through the hydraulic rod, so that the conversion mechanism 17 moves inside the vibration plate 11. Since two screws 14 are arranged on the inner side of the movable track 12, and the two screws 14 are arranged on the same straight line, the conversion mechanism 17 can move between the two screws 14, so that the drive motor 15 can choose to drive one of the two screws 14 to rotate.

[0025] like Figure 3 , Figure 4 and Figure 5 As shown, the conversion mechanism 17 includes a mechanism body 171, bearing seats 172 are installed at both ends of the mechanism body 171, and a moving link 173 is inserted into the inner side of the bearing seat 172. The end of the moving link 173 close to the screw 14 is slidably connected to the screw 14, and the end of the moving link 173 away from the screw 14 is fixedly connected to a driven gear 174, and the output shaft of the drive motor 15 is fixedly connected to a driving gear 151, and the driving gear 151 matches the driven gear 174. It should be noted that the cross-sectional shape of the moving link 173 is a centrally symmetrical figure and is not circular. The end face of the screw 14 is provided with a sliding groove matching the moving link 173. When the moving link 173 moves, the moving link 173 can slide freely in the sliding groove. When the moving link 173 rotates, since the cross-sectional shape of the moving link 173 is not circular, the moving link 173 will drive the screw 14 to rotate synchronously.

[0026] It should be noted that a slide rail 18 is provided inside the vibration plate 11, and a pulley matching the slide rail 18 is installed on the mechanism main body 171 near the slide rail 18. The mechanism main body 171 can stably move inside the vibration plate 11 through the cooperation between the slide rail 18 and the pulley. When in use, the first hydraulic cylinder 16 is opened, and the output end of the first hydraulic cylinder 16 can drive the mechanism main body 171 through the hydraulic rod. The mechanism main body 171 will simultaneously drive the two moving connecting rods 173 to move through the bearing seat 172, and the two moving connecting rods 173 will also drive the driven gear 174 fixedly connected thereto to move. After the driving gear 151 is meshed with one of the driven gears 174, the power of the driving motor 15 can be transmitted to the driven gear 174 through the driving gear 151, driving the driven gear 174 to rotate, and the rotating driven gear 174 can drive the corresponding screw rod 14 to rotate synchronously through the moving connecting rod 173, thereby achieving the purpose of driving the four screw rods 14 to rotate through the two sets of driving motors 15 in sequence.

[0027] like Figure 3 and Figure 6 As shown, the vibration motor 2 includes a motor body 21, a moving slider 23 is fixedly connected to the side of the motor body 21, an eccentric wheel 22 is fixedly connected to the output shaft of the motor body 21, a nut slider 24 is arranged on the inner side of the moving slider 23, the nut slider 24 matches the screw rod 14, and the moving slider 23 matches the moving track 12. It should be noted that the limiting track 13 is fixedly connected to the middle position of the side wall of the moving track 12, and a groove matching the limiting track 13 is provided on the outer side of the moving slider 23 near the limiting track 13. When in use, when it is necessary to adjust the vibration motor 2 at the corresponding position, the first hydraulic cylinder 16 can be opened first, and the output end of the first hydraulic cylinder 16 can drive the mechanism body 171 through the hydraulic rod, and the mechanism body 171 will simultaneously drive the mechanism body 171 through the bearing seat 172 The two moving connecting rods 173 are moved, and the two moving connecting rods 173 will also drive the driven gear 174 fixed thereto to move, so that the driving gear 151 is meshed with the corresponding driven gear 174, and then the driving motor 15 is turned on, and the power of the driving motor 15 can be transmitted to the driven gear 174 through the driving gear 151, driving the driven gear 174 to rotate, and the rotating driven gear 174 can drive the corresponding screw 14 to rotate synchronously through the moving connecting rod 173. Since the nut slider 24 matches the screw 14, the rotating screw 14 cooperates with the nut slider 24 to make the vibration motor 2 slide on the bottom surface of the vibration plate 11 and adjust to different positions. The position of the vibration motor 2 is adjusted according to the type of material, so that when the vibration motor 2 drives the vibration screen body 3 to vibrate, the maximum screening effect is produced.

[0028] An adjusting track 26 is provided inside the movable slider 23, and an adjusting slider 27 matching the adjusting track 26 is fixedly connected to the side of the nut slider 24. A second hydraulic cylinder 25 is fixedly connected to one end of the motor body 21 away from the eccentric wheel 22, and an output end of the second hydraulic cylinder 25 is fixedly connected to one end face of the adjusting slider 27 through a hydraulic rod. After the vibration motor 2 has been working for a long time, due to the inevitable factor of mechanical fatigue, the position adjustment of the vibration motor 2 may be inaccurate. At this time, the second hydraulic cylinder 25 can be opened, and the output end of the second hydraulic cylinder 25 will drive the adjusting slider 27 through the hydraulic rod. Since the adjusting slider 27 is fixedly connected to the side of the nut slider 24, and the second hydraulic cylinder 25 is fixedly connected to one end of the motor body 21 away from the eccentric wheel 22, the adjusting slider 27 will react on the second hydraulic cylinder 25 through the hydraulic rod, so that the second hydraulic cylinder 25 drives the motor body 21 to calibrate the position of the motor body 21, that is, to calibrate the position of the eccentric wheel 22, so that the adjustment position of the eccentric wheel 22 is more accurate.

[0029] Example 2 The limiting mechanism 4 includes a rotating seat 41, one end of which is fixedly connected to a limiting rod 42, a vibration spring 43 is embedded on the side of the limiting rod 42, and a first vibration cavity 44 and a second vibration cavity 46 that match the limiting rod 42 are opened inside the vibration plate 11, the first vibration cavity 44 is connected to a first cylinder 45 through a pipeline, and the second vibration cavity 46 is connected to a second cylinder 47 through a pipeline. It should be noted that the rotating seat 41 includes a moving block 411, one end of which is fixedly connected to the limiting rod 42, and the moving block 411 is fixedly connected to the limiting rod 42. The other end of block 411 is rotatably connected to a rotating shaft block 412, one side of the rotating shaft block 412 is fixedly connected to a connecting sleeve 413, a spherical groove is provided on the inner side of the connecting sleeve 413, a rotatable connecting ball 414 is arranged in the spherical groove, one end of the connecting ball 414 away from the connecting sleeve 413 is fixedly connected to a first telescopic rod 415, one end of the first telescopic rod 415 away from the connecting ball 414 is slidably connected to a second telescopic rod 416, and one end of the second telescopic rod 416 away from the first telescopic rod 415 is also fixedly connected to the connecting ball 414.

[0030] It should be noted that there are four rotating seats 41, which are divided into two groups, with two rotating seats 41 in each group being movably connected by a first telescopic rod 415 and a second telescopic rod 416. The vibrating screen body 3 can be divided into four areas of equal area according to the position of the vibration motor 2. When too much material is accumulated in a certain area on the top surface of the vibrating screen body 3, resulting in the inability to screen the material in this area on the vibrating screen body 3 evenly, the power of the vibration motor 2 corresponding to the area can be relatively increased to ensure that the material in this area is vibrated quickly and evenly. The set rotating seat 41 can ensure that when different areas on the vibrating screen body 3 produce different vibration amplitudes, it will not affect the overall situation.

[0031] Specifically, since the number of motor bodies 21 is four groups, the number of pressure sensors can also be set to four groups, and the positions of the pressure sensors are also distributed in four areas, so the pressure data f is divided into four groups of data, namely f1, f2, f3 and f4. The technical personnel in this field collect the change data set of the pressure data f and the change data set of the power P of the motor body 21 in advance, and use a computer to generate a functional relationship between the two according to the change data set of the pressure data f and the power change data set of the motor body 21.

[0032] Pn=F(fn); Wherein n represents four different motor bodies 21, and takes values ​​of 1, 2, 3 and 4. When the pressure sensor collects the first pressure data f1, the output power corresponding to the first motor body 21 is P1=F(f1), and so on, to control the power of the other three groups of motor bodies 21, Pn is the output power corresponding to the nth motor body 21, fn is the nth pressure data, and F(fn) is the functional relationship between the change data set of the pressure data f and the power change data set of the motor body 21.

[0033] When the excitation body 1 is placed horizontally, there is no need to control the vibration resistance of the excitation body 1. When the excitation body 1 is placed tilted, it is necessary to control the vibration resistance of the excitation body 1 so that the vibration resistance can offset the horizontal force of the excitation body 1. Specifically: The first cylinder 45 and the second cylinder 47 are controlled by a control module. The first cylinder 45 is connected to the first vibration chamber 44 through a pipe, and the second cylinder 47 is connected to the second vibration chamber 46 through a pipe. The control module is used to control the valves arranged in the pipe. A barometer is arranged inside the first vibration chamber 44 and the second vibration chamber 46. Automatic exhaust valves are also required to be arranged in the first vibration chamber 44 and the second vibration chamber 46. When the air pressure needs to be reduced, the automatic exhaust valve is opened to reduce the air pressure inside the first vibration chamber 44 or the second vibration chamber 46.

[0034] When the vibration body 1 is placed horizontally, the automatic exhaust valves in the first vibration chamber 44 and the second vibration chamber 46 are opened by the control module to make the inner chambers of the first vibration chamber 44 and the second vibration chamber 46 in a normal pressure state. When the vibration body 1 is placed tilted, the corresponding cylinder is opened according to the tilting direction to Figure 1Taking the tilting direction of the middle vibration body 1 as an example, open the valve between the second cylinder 47 and the second vibration chamber 46, so that the air pressure in the second cylinder 47 can enter the second vibration chamber 46 through the pipeline, thereby increasing the pressure inside the second vibration chamber 46. The pressure can act on the limit rod 42, so that the limit rod 42 balances the gravity of the whole vibration body 1 in the horizontal direction through the air pressure, so that the four vibration springs 43 are in the same deformation, ensuring that the vibration of the vibration body 1 is more uniform and stable when working, thereby ensuring the screening effect of the vibration screen body 3.

[0035] The bottom end of the support column 5 is connected to a telescopic column 6, the bottom surface of the telescopic column 6 is fixedly connected to a support foot 7, the outer side of the support foot 7 is fixedly connected to a first support plate 8 and a second support plate 9, the first support plate 8 and the second support plate 9 are slidably connected, and a spring is connected between the support column 5 and the telescopic column 6 to increase the vibration elastic force of the support column 5 in the vertical direction.

[0036] It should be noted that when the excitation body 1 is in a horizontal state, the distance between the support columns 5 at both ends of the excitation body 1 is the largest. When the excitation body 1 is in an inclined state, the distance between the support columns 5 at both ends of the excitation body 1 will gradually decrease with the increase of the inclination angle. Therefore, the sliding connection between the first support plate 8 and the second support plate 9 can ensure that the distance between the support columns 5 at both ends of the excitation body 1 can be adaptively adjusted to ensure the supporting effect of the support columns 5.

[0037] Example 3 like Figure 1-Figure 9 As shown, the present invention discloses a motion stability control method for a multi-point synchronous excitation device for a vibrating screen, comprising the following steps: S1: The control module adjusts the vibration resistance of the vibration body 1 according to the tilt angle of the vibration body 1; It should be noted that the first cylinder 45 and the second cylinder 47 are controlled by a control module. The first cylinder 45 is connected to the first vibration chamber 44 through a pipe, and the second cylinder 47 is connected to the second vibration chamber 46 through a pipe. The control module is used to control the valves arranged in the pipes. Barometers are arranged inside the first vibration chamber 44 and the second vibration chamber 46. Automatic exhaust valves are also required to be arranged in the first vibration chamber 44 and the second vibration chamber 46. When the air pressure needs to be reduced, the automatic exhaust valve is opened to reduce the air pressure inside the first vibration chamber 44 or the second vibration chamber 46.

[0038] When the vibration body 1 is placed horizontally, the automatic exhaust valves in the first vibration chamber 44 and the second vibration chamber 46 are opened by the control module to make the inner chambers of the first vibration chamber 44 and the second vibration chamber 46 in a normal pressure state. When the vibration body 1 is placed tilted, the corresponding cylinder is opened according to the tilting direction to Figure 1Taking the tilting direction of the vibration body 1 as an example, open the valve between the second cylinder 47 and the second vibration chamber 46, so that the air pressure in the second cylinder 47 can enter the second vibration chamber 46 through the pipeline, thereby increasing the pressure inside the second vibration chamber 46. The pressure is controlled by technicians in this field according to the overall vibration body 1 to ensure that when the vibration body 1 is tilted, the elastic force of the vibration springs 43 on the sides of the four limit rods 42 is consistent.

[0039] S2: The control module collects pressure data through the pressure sensor; It should be noted that, since there are four motor bodies 21, the number of pressure sensors can also be set to four groups, and the pressure sensors are also distributed in four areas, so the pressure data f is divided into four groups of data, namely f1, f2, f3 and f4.

[0040] S3: Based on the pressure data collected by the pressure sensor, the control module controls the power of the vibration motor 2; It should be noted that the technicians in this field collect the pressure data f change data set and the power P change data set of the motor body 21 in advance, and use a computer to generate a functional relationship between the pressure data f change data set and the power change data set of the motor body 21.

[0041] Pn=F(fn); Wherein n represents four different motor bodies 21, and takes values ​​of 1, 2, 3 and 4. When the pressure sensor collects the first pressure data f1, the output power corresponding to the first motor body 21 is P1=F(f1), and so on, to control the operation of the other three groups of motor bodies 21.

[0042] S4: installing an amplitude sensor on the vibrating screen body 3, and the control module collects amplitude data through the amplitude sensor; It should be noted that, since there are four motor bodies 21, the number of vibration sensors can also be set to four groups, and the locations of the vibration sensors are also distributed in four areas, so the amplitude data A is divided into four groups of data, namely A1, A2, A3 and A4.

[0043] S5: Based on the amplitude data collected by the amplitude sensor, the control module controls the position of the vibration motor 2.

[0044] It should be noted that the technicians in this field collect the change data set of the amplitude data A and the change data set of the position L of the motor body 21 in advance, and use a computer to generate a functional relationship between the two based on the change data set of the amplitude data A and the change data set of the position L of the motor body 21.

[0045] Ln=F(An); Wherein n represents four different motor bodies 21, and takes values ​​of 1, 2, 3 and 4. When the vibration sensor collects the first amplitude data A1, the spatial position corresponding to the first motor body 21 is L1=F(A1). Similarly, the positions of the other three groups of motor bodies 21 are controlled to ensure the position accuracy of the four motor bodies 21. An is the nth amplitude data, and Ln is the spatial position corresponding to the nth amplitude data. The spatial position of the motor body 21 takes the center point of the moving track 12 as the origin, and the distance between the nut slider 24 on the motor body 21 and the origin is L.

[0046] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A multi-point synchronous excitation device for a vibrating screen, characterized in that: include: A vibration excitation body (1) is provided with a vibration screen body (3) on its top surface, a control module is mounted on the vibration excitation body (1), and a pressure sensor is installed on the vibration screen body (3); Vibration motors (2), the number of which is at least four groups, and the four groups of vibration motors (2) are installed on the bottom surface of the vibration excitation body (1); A limit mechanism (4) is installed at both ends of the vibration excitation body (1) and is used to adjust the vibration resistance of the vibration excitation body (1); the bottom of the limit mechanism (4) is rotatably connected to a support column (5); the bottom end of the support column (5) is connected to a telescopic column (6); the control module collects pressure data through a pressure sensor and controls the power of the vibration motor (2) based on the pressure data; The excitation body (1) comprises a vibration plate (11), movable tracks (12) are provided on both sides of the bottom surface of the vibration plate (11), screw rods (14) are installed on the inner sides of the movable tracks (12) via bearings, and drive motors (15) are bolted to the middle positions of both sides of the vibration plate (11), and the drive motors (15) are used to drive the screw rods (14).

2. The multi-point synchronous excitation device for a vibrating screen according to claim 1, characterized in that: A first hydraulic cylinder (16) is arranged at a middle position inside the movable track (12), and an output end of the first hydraulic cylinder (16) is connected to a conversion mechanism (17) via a hydraulic rod.

3. The multi-point synchronous excitation device for a vibrating screen according to claim 2, characterized in that: The conversion mechanism (17) comprises a mechanism body (171), bearing seats (172) are installed at both ends of the mechanism body (171), a movable connecting rod (173) is inserted into the inner side of the bearing seat (172), an end of the movable connecting rod (173) close to the screw rod (14) is slidably connected to the screw rod (14), and an end of the movable connecting rod (173) away from the screw rod (14) is fixedly connected to a driven gear (174), and an output shaft of the driving motor (15) is fixedly connected to a driving gear (151), and the driving gear (151) matches the driven gear (174).

4. The multi-point synchronous excitation device for a vibrating screen according to claim 1, characterized in that: The vibration motor (2) comprises a motor body (21), a moving slider (23) is fixedly connected to the side of the motor body (21), an eccentric wheel (22) is fixedly connected to the output shaft of the motor body (21), a nut slider (24) is arranged on the inner side of the moving slider (23), the nut slider (24) matches the screw rod (14), and the moving slider (23) matches the moving track (12).

5. The multi-point synchronous excitation device for a vibrating screen according to claim 4, characterized in that: An adjustment track (26) is provided inside the movable slider (23); an adjustment slider (27) matching the adjustment track (26) is fixedly connected to the side of the nut slider (24); an end of the motor body (21) away from the eccentric wheel (22) is fixedly connected to a second hydraulic cylinder (25); an output end of the second hydraulic cylinder (25) is fixedly connected to an end surface of one end of the adjustment slider (27) via a hydraulic rod.

6. The multi-point synchronous excitation device for a vibrating screen according to claim 2, characterized in that: The limiting mechanism (4) comprises a rotating seat (41), one end of the rotating seat (41) is fixedly connected to a limiting rod (42), a vibration spring (43) is embedded in the side of the limiting rod (42), and a first vibration cavity (44) and a second vibration cavity (46) that match the limiting rod (42) are provided inside the vibration plate (11).

7. The multi-point synchronous excitation device for a vibrating screen according to claim 6, characterized in that: The first vibration chamber (44) is connected to a first cylinder (45) via a pipeline, and the second vibration chamber (46) is connected to a second cylinder (47) via a pipeline.

8. The multi-point synchronous excitation device for a vibrating screen according to claim 1, characterized in that: The bottom end of the support column (5) is connected to a telescopic column (6), the bottom surface of the telescopic column (6) is fixedly connected to a support foot (7), the outer side of the support foot (7) is fixedly connected to a first support plate (8) and a second support plate (9), and the first support plate (8) and the second support plate (9) are slidably connected to each other.

9. A method for controlling the motion stability of a multi-point synchronous excitation device for a vibrating screen, which is implemented based on the multi-point synchronous excitation device for a vibrating screen according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The control module adjusts the vibration resistance of the vibration body (1) according to the tilt angle of the vibration body (1); S2: The control module collects pressure data through the pressure sensor; S3: Based on the pressure data collected by the pressure sensor, the control module controls the power of the vibration motor (2); S4: installing an amplitude sensor on the vibrating screen body (3), and the control module collects amplitude data through the amplitude sensor; S5: Based on the amplitude data collected by the amplitude sensor, the control module controls the position of the vibration motor (2).

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