Electromagnetic force displacement composite excitation screening equipment and method

Abstract

The invention relates to electromagnetic force displacement composite excitation screening equipment and method, belongs to the technical field of solid bulk material separation, and solves the technical problems of poor adaptability to complex working conditions and failure in a microgravity environment of vibration screening equipment under the action of a gravity field in the prior art. The device comprises a sieve plate mechanism, a composite excitation mechanism and an auxiliary screening mechanism, the sieve plate mechanism comprises a flexible sieve plate, the composite excitation mechanism and the auxiliary screening mechanism are both connected with the sieve plate mechanism, the composite excitation mechanism is used for providing displacement excitation for the flexible sieve plate, and the auxiliary screening mechanism is used for providing displacement excitation for the flexible sieve plate. And the auxiliary screening mechanism is used for screening materials in a microgravity environment. Displacement excitation is provided for the flexible screen plate through the composite excitation mechanism, excitation force does not exist, material screening is achieved only through electromagnetic force and displacement driving, the auxiliary screening mechanism is used for enabling materials to penetrate through the flexible screen plate in the microgravity environment, efficient material screening in the microgravity environment is achieved, and the environmental adaptability is high.

Description

Technical Field

[0001] The invention relates to the technical field of solid bulk material separation, and in particular to an electromagnetic force displacement composite excitation screening device and method. Background Art

[0002] Screening is an important way to separate solid bulk materials according to their particle size. Screening equipment is widely used in mining, metallurgy and other industries. Traditional screening methods mainly use exciting force drive to operate, and the exciting force mainly comes from a vibration motor or vibrator. However, for vibrators or vibration motors, the exciting force of the screening equipment is difficult to adjust due to the large size of the equipment and the complex excitation system. As a result, in industrial production, the characteristics of the screened materials change, and the operating parameters of the screening equipment cannot be adjusted. The adaptability to the complex working conditions of actual production is extremely poor, which also restricts the intelligent development of screening equipment.

[0003] On the other hand, the current screening equipment at home and abroad mainly relies on the eccentric pendulum block of the vibration motor or the vibrator to move under the action of gravity to generate the exciting force; but in a vacuum state or microgravity environment, due to the absence of gravity or weak gravity effect, the exciting force cannot be generated to drive the screening equipment to move, resulting in equipment failure. In recent years, for the development and utilization of space mineral resources, mineral resources deep in the earth, and deep-sea minerals, the above-mentioned screening equipment is a key link in the comprehensive utilization of mineral resources. The failure of the working principle of traditional screening equipment has become a technical bottleneck for the development of deep-sea, deep-space, and deep-earth minerals, restricting the comprehensive utilization of mineral resources.

[0004] Therefore, it is urgent to break through the traditional vibration screening method under the action of gravity field, propose a new screening method, develop new non-vibration excitation screening equipment, realize the adaptability and intelligent development of screening equipment under complex working conditions, and propose technical and equipment support for the development and utilization of mineral resources in deep sea, deep space and deep earth. Summary of the invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide an electromagnetic force displacement composite excitation screening device and method to solve the technical problems of poor adaptability to complex working conditions and failure in microgravity environment of existing vibration screening equipment under the action of gravity field.

[0006] On the one hand, the present invention provides an electromagnetic force displacement composite excitation screening device, including a sieve plate mechanism, a composite excitation mechanism and an auxiliary screening mechanism, the sieve plate mechanism includes a flexible sieve plate, the composite excitation mechanism and the auxiliary screening mechanism are both connected to the sieve plate mechanism, the composite excitation mechanism is used to provide displacement excitation for the flexible sieve plate, and the auxiliary screening mechanism is used to screen materials in a microgravity environment.

[0007] Furthermore, the screen plate mechanism also includes a fixed beam, and two of the flexible screen plates and two of the fixed beams are provided, the two flexible screen plates are arranged in parallel, and the two fixed beams are arranged in parallel.

[0008] Furthermore, the screen plate mechanism also includes a movable beam, the fixed beam and the movable beam are arranged in parallel, and the movable beam is arranged between the two fixed beams.

[0009] Furthermore, one side of the flexible screen plate is connected to the fixed beam, and the other side of the flexible screen plate is connected to the movable beam.

[0010] Furthermore, the two flexible screen plates arranged in parallel are connected to the same movable beam, and the movable beam can be located between the two fixed beams to perform horizontal reciprocating motion.

[0011] Furthermore, the screen plate mechanism further comprises a first side plate, a second side plate, a third side plate and a fourth side plate, and the first side plate, the second side plate, the third side plate and the fourth side plate are arranged to form a rectangular tube.

[0012] Furthermore, the screen plate mechanism also includes a material receiving box and a cover plate, wherein the material receiving box is arranged at the bottom of the rectangular tube, and the cover plate is arranged at the top of the rectangular tube.

[0013] Furthermore, the flexible screen plate is arranged in the rectangular cylinder, and the material receiving box is located below the flexible screen plate.

[0014] Furthermore, the composite excitation mechanism comprises a magnetic suspension drive block, and two magnetic suspension drive blocks are provided, and the two magnetic suspension drive blocks are respectively arranged on the first side plate and the second side plate.

[0015] On the other hand, the present invention provides a screening method, which uses the above-mentioned electromagnetic force displacement composite excitation screening equipment to screen materials.

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

[0017] (1) The present invention provides displacement excitation for the flexible screen plate through a composite excitation mechanism. There is no exciting force, and the screening of materials is achieved only by electromagnetic force and displacement drive. The auxiliary screening mechanism is used for the material to pass through the flexible screen plate in a microgravity environment. It can not only achieve high-efficiency screening of materials in a microgravity environment and have strong environmental adaptability, but also can adjust the movement frequency and amplitude of the flexible screen plate by adjusting the frequency and voltage of the current to adapt to different material properties.

[0018] (2) The fixed beam and movable beam of the present invention are arranged in parallel, the fixed beam is arranged between the two movable beams, the flexible screen plate is arranged between the fixed beam and the movable beam, the two opposite sides of the flexible screen plate are respectively connected to the fixed beam and the movable beam, the two ends of the movable beam are connected to the permanent magnet of the movable beam, the permanent magnet of the movable beam is arranged in the excitation track for reciprocating motion, driving the flexible screen plate to stretch and tighten or shrink and relax, thereby being able to change the size of the screen holes on the flexible screen plate, and effectively avoiding the blockage of the screen holes. During the reciprocating motion of the movable beam, one of the flexible screen plates is driven to stretch and tighten, while the other flexible screen plate is driven to shrink and relax. The middle part of the relaxed flexible screen plate will sag, and in the process of being stretched and tightened again, the material will be thrown up, so that the material is loosened, the screening permeability of the material is improved, and the screening efficiency is improved.

[0019] (3) The blower of the present invention compresses air, which enters the air storage tank through the first pipe and is then fed to the top of the flexible screen plate through the second pipe. A negative pressure airflow is fed to the top of the flexible screen plate through the second pipe, so that the material is subjected to a downward drag force, thereby colliding and separating with the flexible screen plate. Alternatively, the lifting assembly drives the flexible screen plate to make an up and down reciprocating motion, contacting the material and continuously cutting the material, thereby causing the material to collide with and penetrate the flexible screen plate, thereby realizing screening in a microgravity environment. At the same time, the up and down reciprocating motion of the flexible screen plate is coupled with the displacement excitation in the horizontal direction, thereby further improving the screening efficiency.

[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 specific embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0022] Figure 1 This is one of the structural schematic diagrams of the electromagnetic force displacement composite excitation screening device of specific embodiment 1;

[0023] Figure 2 This is the second structural schematic diagram of the electromagnetic force displacement composite excitation screening device of the specific embodiment 1;

[0024] Figure 3 It is a schematic diagram of the connection structure of the sieve plate mechanism and the composite excitation mechanism of the specific embodiment 1;

[0025] Figure 4 It is a schematic diagram of the connection structure of part of the sieve plate mechanism and part of the composite excitation mechanism of the specific embodiment 1;

[0026] Figure 5 It is a structural schematic diagram of a part of the composite excitation mechanism of specific embodiment 1;

[0027] Figure 6 For specific embodiment 1 Figure 5 A cross-sectional schematic diagram of

[0028] Figure 7 It is a structural schematic diagram of the electromagnetic force displacement composite excitation screening device of specific embodiment 2;

[0029] Figure 8 It is a structural schematic diagram of the lifting mechanism of specific embodiment 2.

[0030] Reference numerals:

[0031] 100-screen plate mechanism; 101-flexible screen plate; 102-movable beam; 103-fixed beam; 104-first side plate; 105-second side plate; 106-third side plate; 107-fourth side plate; 108-material receiving box; 109-cover plate;

[0032] 200-composite excitation mechanism; 201-magnetic suspension drive block; 202-moving beam permanent magnet; 203-excitation track; 204-permanent magnet; 205-coil; 206-controller;

[0033] 300- auxiliary screening mechanism; 301- pneumatic conveying assembly; 302- hot air heating assembly; 303- blower; 304- gas storage tank; 305- first pipeline; 306- second pipeline; 307- guide rail housing; 308- guide rail; 309- slider; 310- slide rail; 311- steel cable; 312- lifting motor; 313- motor winch. DETAILED DESCRIPTION

[0034] 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.

[0035] Example 1

[0036] A specific embodiment of the present invention, combined with Figure 1 , Figure 2 and Figure 3 As shown, an electromagnetic force displacement composite excitation screening device is disclosed, including a sieve plate mechanism 100, a composite excitation mechanism 200 and an auxiliary screening mechanism 300. The composite excitation mechanism 200 and the auxiliary screening mechanism 300 are both connected to the sieve plate mechanism 100. The composite excitation mechanism 200 provides displacement excitation for the flexible sieve plate 101 of the sieve plate mechanism 100, and the auxiliary screening mechanism 300 is used for screening materials in a microgravity environment.

[0037] Compared with the prior art, the electromagnetic force displacement composite excitation screening equipment provided in this embodiment provides displacement excitation for the flexible screen plate 101 through the composite excitation mechanism 200. There is no exciting force, and high-efficiency screening of materials is achieved by relying on electromagnetic force and displacement drive. The auxiliary screening mechanism 300 is used for the material to pass through the flexible screen plate 101 in a microgravity environment. It can not only realize material screening in a microgravity environment and has strong environmental adaptability (it can also be used normally under gravity conditions), but also can adjust the movement frequency and amplitude of the flexible screen plate 101 by adjusting the frequency and voltage of the current to adapt to different material properties.

[0038] Combination Figure 3 and Figure 4 As shown, the screen plate mechanism 100 includes a flexible screen plate 101, a movable beam 102 and a fixed beam 103. Two flexible screen plates 101 are provided, and the two flexible screen plates 101 are arranged in parallel. Two fixed beams 103 are provided, and the two fixed beams 103 are arranged in parallel, and the fixed beam 103 and the movable beam 102 are arranged in parallel. The two flexible screen plates 101 are connected to a movable beam 102 at the same time, and the two fixed beams 103 are connected to the two flexible screen plates 101 respectively, that is, one fixed beam 103 is connected to one flexible screen plate 101.

[0039] In this embodiment, the fixed beam 103 and the movable beam 102 are arranged in parallel, the fixed beam 103 is arranged between the two movable beams 102, the flexible screen plate 101 is arranged between the fixed beam 103 and the movable beam 102, and the two opposite sides of the flexible screen plate 101 are respectively connected to the fixed beam 103 and the movable beam 102. When the movable beam 102 moves between the two fixed beams 103, it drives the flexible screen plate 101 to stretch or shrink and relax, thereby changing the size of the sieve holes on the flexible screen plate 101.

[0040] For a sieve plate with a fixed mesh size, after screening a certain amount of material, the material with particles of the same size as the mesh will get stuck in the mesh and block the sieve plate. However, the flexible sieve plate 101 of this embodiment drives the mesh size to change under the action of the movable beam 102, which can effectively avoid the blockage of the mesh, improve the screening permeability of the material, and thus improve the screening efficiency. Preferably, the flexible sieve plate 101 is made of polyurethane polymer material commonly used in industrial screening equipment.

[0041] In order to achieve the fixation of the fixed beam 103 and the collection of materials, combined with Figure 1 , Figure 2 and Figure 3As shown, the screen plate mechanism 100 also includes a first side plate 104, a second side plate 105, a third side plate 106, a fourth side plate 107 and a material receiving box 108, the first side plate 104 and the second side plate 105 are the same, the two are arranged in parallel, the third side plate 106 and the fourth side plate 107 are the same, the two are arranged in parallel. A rectangular tube is surrounded by the first side plate 104, the second side plate 105, the third side plate 106 and the fourth side plate 107, and the material receiving box 108 is arranged below the rectangular tube. The two ends of the fixed beam 103 are respectively fixedly connected to the first side plate 104 and the second side plate 105. Exemplarily, the two ends of the fixed beam 103 are respectively threaded with the first side plate 104 and the second side plate 105.

[0042] To avoid spillage of materials, Figure 1 , Figure 2 and Figure 3 As shown, the screen plate mechanism 100 further includes a cover plate 109, which is disposed on the top of the rectangular cylinder. Exemplarily, the lower end of the rectangular cylinder is connected to the top of the material receiving box 108, and the cover plate 109 is covered on the rectangular cylinder.

[0043] In this embodiment, a rectangular cylinder is formed by the first side plate 104, the second side plate 105, the third side plate 106 and the fourth side plate 107, the flexible screen plate 101 is arranged in the rectangular cylinder, a receiving box 108 is arranged at the bottom of the rectangular cylinder, and a cover plate 109 is arranged at the top of the rectangular cylinder. The material sieved by the flexible screen plate 101 enters the receiving box 108, and the splashing of the material is avoided under the joint action of the rectangular cylinder and the cover plate 109.

[0044] Combination Figure 3 , Figure 4 and Figure 5 As shown, the composite excitation mechanism 200 includes a magnetic suspension drive block 201 and a moving beam permanent magnet 202. There are two magnetic suspension drive blocks 201, which are respectively installed on the inner side of the first side plate 104 and the inner side of the second side plate 105. The two magnetic suspension drive blocks 201 are symmetrical about the symmetry plane of the first side plate 104 and the second side plate 105.

[0045] In order to install the moving beam permanent magnet 202, as Figure 5 and Figure 6 As shown, the magnetic suspension drive block 201 is provided with an excitation track 203, which is arranged along the length of the magnetic suspension drive block 201, and the movable beam permanent magnet 202 is arranged in the excitation track 203, and the movable beam permanent magnet 202 can reciprocate in the excitation track 203. The two ends of the movable beam 102 are respectively connected to a movable beam permanent magnet 202. The excitation track 203 is formed by a groove arranged on the magnetic suspension drive block 201.

[0046] In this embodiment, the two ends of the movable beam 102 are respectively connected to a movable beam permanent magnet 202, and the movable beam permanent magnet 202 is arranged in the excitation track 203 to do reciprocating motion. The excitation track 203 is arranged horizontally. Driven by the movable beam permanent magnet 202, the movable beam 102 reciprocates in the horizontal plane, thereby driving the two flexible screen plates 101 connected thereto to stretch and tighten or shrink and relax. When the flexible screen plates 101 are in the process of reciprocating stretching, tightening, shrinking and relaxing, the size of the screen holes of the flexible screen plates 101 changes, which can avoid the material from blocking the screen holes and realize efficient screening of the material. During the reciprocating motion of the movable beam 102, one of the flexible screen plates 101 is stretched and tightened, while the other flexible screen plate 101 is contracted and relaxed. The middle part of the relaxed flexible screen plate 101 will sag. In the process of being stretched and tightened again, the material will be thrown up, so that the material is loosened, the material permeability is improved, and the screening efficiency is improved.

[0047] In order to realize the reciprocating motion of the moving beam permanent magnet 202 arranged in the excitation track 203, as Figure 5 and Figure 6 As shown, the composite excitation mechanism 200 also includes a permanent magnet 204. Two permanent magnets 204 are provided. The two permanent magnets 204 are respectively arranged on both sides of the moving beam permanent magnet 202. At the same time, the permanent magnet 204 located on one side of the moving beam permanent magnet 202 has opposite magnetic properties to the end of the moving beam permanent magnet 202 adjacent thereto. Exemplarily, the left end of the moving beam permanent magnet 202 is N-class and the right end is S-class. The end of the permanent magnet 204 located at the left end of the excitation track 203 facing the moving beam permanent magnet 202 is N-class, and the end of the permanent magnet 204 located at the right end of the excitation track 203 facing the moving beam permanent magnet 202 is S-class. Preferably, the moving beam permanent magnet 202 and the permanent magnet 204 are both permanent magnets.

[0048] Preferably, the excitation track 203 is a cylindrical groove, and accordingly, the moving beam permanent magnet 202 is cylindrical, the radius of the excitation track 203 is slightly larger than the radius of the moving beam permanent magnet 202, and the length of the excitation track 203 after the permanent magnet 204 is arranged is larger than the thickness of the moving beam permanent magnet 202, so that the moving beam permanent magnet 202 has sufficient space to reciprocate in the excitation track 203. The radius of the permanent magnet 204 is equal to the radius of the excitation track 203.

[0049] It should be noted that the excitation track 203 may also be a rectangular groove, an elliptical column groove, etc., and is not limited to a cylindrical groove, as long as the moving beam permanent magnet 202 can achieve reciprocating movement in the excitation track 203.

[0050] Combination Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the composite excitation mechanism 200 also includes a coil 205, which is arranged on the outer side of the excitation track 203, adjacent to one of the permanent magnets 204, for forming a driving magnetic field. The center of the coil 205 coincides with the center of the excitation track 203 in the axial direction. The coil 205 located on the first side plate 104 side and the coil 205 located on the second side plate 105 side are connected together to achieve synchronous and unidirectional movement of the moving beam permanent magnets 202 on both sides.

[0051] In order to control the gain and loss of power of the coil 205 and adjust the current magnitude and frequency of the coil 205, as shown in FIG. Figure 1 , Figure 2 and Figure 3 As shown, the composite excitation mechanism 200 also includes a controller 206 and a motor (not shown in the figure), which are installed on the outside of the first side plate 104. The output end of the motor is connected to the coil 205 for energizing the coil 205. The controller 206 is used to adjust the current of the coil 205 to generate a magnetic field force, thereby driving the movable beam permanent magnet 202 to move back and forth in the excitation track 203, thereby driving the movable beam 102 to move, so as to achieve the displacement excitation effect on the flexible screen plate 101. The controller 206 is mainly used to adjust the magnitude and frequency of the current.

[0052] like Figure 1 and Figure 2 As shown, the auxiliary screening mechanism 300 includes a pneumatic conveying component 301 and a hot air heating component 302, and the hot air heating component 302 is arranged on the pneumatic conveying component 301. The pneumatic conveying component 301 includes a blower 303, an air tank 304, a first pipe 305 and a second pipe 306. The output end of the blower 303 is connected to the air tank 304 through the first pipe 305, one end of the second pipe 306 is connected to the air tank 304, and the other end extends into the rectangular cylinder through the cover plate 109, and the end of the second pipe 306 is divided into two air outlets, and the two air outlets are respectively aligned with the top of the two flexible screen plates 101 to blow air to the flexible screen plates 101. The hot air heating component 302 is arranged on the first pipe 305 for heating the airflow.

[0053] In this embodiment, the blower 303, the air tank 304 and the sieve plate mechanism 100 are connected through the first pipe 305 and the second pipe 306. When in a microgravity environment, the blower 303 compresses the air, enters the air tank 304 through the first pipe 305, and then is fed to the top of the flexible sieve plate 101 through the second pipe 306. The negative pressure airflow is fed to the top of the flexible sieve plate 101 through the second pipe 306, so that the material is subjected to a downward drag force, thereby colliding and separating with the flexible sieve plate 101, and realizing high-efficiency screening in a microgravity environment. The hot air heating component 302 is arranged on the first pipe 305. When the material is wet, the hot air heating component 302 heats the airflow generated by the blower 303, thereby drying the wet material and assisting the screening operation. The air tank 304 is used to store compressed air and plays a buffering role.

[0054] Example 2

[0055] Another specific embodiment of the present invention is as follows Figure 7 and Figure 8 As shown, an electromagnetic force displacement composite excitation screening device is disclosed. The difference from Example 1 is that the auxiliary screening mechanism 300 is a lifting assembly, which includes a guide rail housing 307 and a guide rail 308. The guide rail housing 307 is sleeved on the outside of the rectangular tube and the material receiving box 108. There are four guide rails 308, and the four guide rails 308 are located on both sides of the rectangular tube in pairs. The guide rails 308 are connected to the inner wall of the guide rail housing 307 and are vertically arranged. Specifically, two guide rails 308 are arranged on the side adjacent to the first side plate 104 of the guide rail housing 307, and two guide rails 308 are arranged on the side adjacent to the second side plate 105 of the guide rail housing 307. The whole formed by the rectangular tube and the material receiving box 108 can reciprocate up and down along the guide rail 308. It should be noted that the cover plate 109 is no longer needed at this time.

[0056] The electromagnetic force displacement composite excitation screening equipment provided in this embodiment, when in a microgravity environment, the material no longer moves vertically downward due to the action of gravity, and the particle group is dispersed in the space system. The lifting assembly drives the screen plate mechanism 100 and the composite excitation mechanism 200 to reciprocate up and down, driving the flexible screen plate 101 to contact the material in the guide rail housing 307 and continuously drive (cut) the material, thereby promoting the collision and screening of the material with the flexible screen plate 101, thereby realizing high-efficiency screening in a microgravity environment.

[0057] like Figure 7 and Figure 8 As shown, the lifting assembly also includes a slider 309, and four sliders 309 are provided. The four sliders 309 are respectively matched with four guide rails 308, two sliders 309 are connected to the first side plate 104, and the other two sliders 309 are connected to the second side plate 105. The sliders 309 slide along the guide rails 308, thereby driving the screen plate mechanism 100 and the compound excitation mechanism 200 to move up and down in the guide rail housing 307.

[0058] In order to realize the up and down movement of the slider 309 along the guide rail 308, as shown in FIG. Figure 7 and Figure 8 As shown, the lifting assembly also includes a slide rail 310, a steel cable 311, a lifting motor 312, a motor winch 313 and a tension spring (not shown in the figure). The slide rail 310 is arranged at the top of the guide rail 308, the lifting motor 312 and the motor winch 313 are arranged outside the guide rail housing 307, the motor winch 313 is connected to the output shaft of the lifting motor 312, one end of the steel cable 311 is connected to the motor winch 313, and the other end passes through the slide rail 310 and is connected to the top of the slider 309. The slide rail 310 is provided with an arc-shaped groove for the steel cable 311 to pass through, the upper end of the tension spring is connected to the lower end of the slider 309, and the lower end of the tension spring is connected to the bottom of the guide rail 308.

[0059] In this embodiment, the motor winch 313 is driven to rotate by the lifting motor 312, and the steel cable 311 is wound or released, thereby driving the slider 309 to move along the guide rail 308. When the motor winch 313 winds the steel cable 311, it drives the slider 309 to move upward along the guide rail 308. When the motor winch 313 releases the steel cable 311, the slider 309 moves downward under the action of the tension spring, thereby realizing that the flexible screen plate 101 contacts and continuously cuts the material during the up and down reciprocating motion, promoting the collision and screening of the material with the flexible screen plate 101, and realizing screening in a microgravity environment. At the same time, the moving beam permanent magnet 202 reciprocates in the excitation track 203, thereby driving the movable beam 102 to move, realizing the displacement excitation of the flexible screen plate 101, and the up and down reciprocating motion of the flexible screen plate 101 is coupled with the displacement excitation in the horizontal direction, realizing the screening of materials in a microgravity environment, while improving the screening efficiency.

[0060] Example 3

[0061] Another specific embodiment of the present invention discloses a screening method, using the electromagnetic displacement composite excitation device of embodiment 1 or embodiment 2, comprising the following steps:

[0062] Step S1 : the coil 205 is energized to provide displacement excitation to the flexible screen plate 101 .

[0063] The motor supplies power to the coil 205, and the coil 205 generates a magnetic field as a driving magnetic field, generating a driving magnetic field force on the moving beam permanent magnet 202. The controller 206 controls the voltage and frequency flowing into the two coils 205. When the alternating current passes through, the moving beam permanent magnet 202 is subjected to an unbalanced force and first moves toward one end of the excitation track 203. After the current direction changes, the moving beam permanent magnet 202 decelerates and moves toward the other end of the excitation track 203. With the change of the driving magnetic field and the buffering effect of the permanent magnets 204 at both ends of the excitation track 203, the moving beam permanent magnet 202 generates periodic simple harmonic motion in the excitation track 203, driving the moving beam 102 to reciprocate. Under the displacement excitation of the moving beam 102, the flexible screen plate 101 continuously ejects the material on the flexible screen plate 101, promoting its high-efficiency screening.

[0064] It should be noted that when the coil 205 is not energized, according to the properties of the magnetic field, the permanent magnets 204 at both ends of the excitation track 203 repel each other with the same poles of the moving beam permanent magnet 202 and have the same magnetic force, so that the moving beam permanent magnet 202 is subjected to balanced force in the excitation track 203, stably suspended in the excitation track 203, and is located in the middle of the excitation track 203.

[0065] It is worth noting that the voltage and frequency flowing into the coil 205 are adjusted by the controller 206 to change the magnetic field, change the operating properties of the movable beam permanent magnet 202, and adjust the movement frequency and amplitude of the flexible screen plate 101 to adapt to different material properties. Specifically, the frequency of the alternating current is adjusted to change the change cycle of the driving magnetic field force, thereby adjusting the movement frequency of the movable beam permanent magnet 202, and then adjusting the movement frequency of the flexible screen plate 101. The voltage of the alternating current is adjusted to change the magnetic force of the driving magnetic field, thereby adjusting the maximum displacement of the movable beam 102 and adjusting the movement amplitude of the flexible screen plate 101. For example, when the average particle size of the material becomes finer or the fine particle content increases, according to the experience of the screening industry, a high-frequency and small-amplitude movement mode should be adopted, that is, the frequency of the alternating current is increased and the voltage of the alternating current is reduced.

[0066] Step S2: The auxiliary screening mechanism 300 enables the material to pass through the screen.

[0067] The blower 303 is started, and the compressed air enters the air tank 304 through the first pipe 305. After being buffered by the air tank 304, the compressed air is fed from the top of the flexible screen plate 101 through the second pipe 306. The negative pressure airflow causes the material to be subjected to downward drag, thereby colliding and separating from the flexible screen plate 101, thereby achieving screening in a microgravity environment. When the material is wet, the hot air heating component 302 is started to heat the airflow flowing through the first pipe 305, thereby drying the wet material and assisting the screening operation.

[0068] Alternatively, the lifting motor 312 is started, and when the lifting motor 312 rotates forward, the motor winch 313 rotates and wraps around the steel cable 311, thereby driving the slider 309 to move upward along the slide rail 310, and the screen plate mechanism 100 and the compound excitation mechanism 200 move upward synchronously. When the lifting motor 312 is reversed, the motor winch 313 rotates and releases the steel cable 311. Under the action of the tension spring, the slider 309 moves downward along the slide rail 310, and the screen plate mechanism 100 and the compound excitation mechanism 200 move downward synchronously, realizing the up and down reciprocating motion of the flexible screen plate 101. During this process, the flexible screen plate 101 contacts the material and continuously drives (shears) the material, causing the material to collide and penetrate the flexible screen plate 101, thereby realizing efficient screening of materials in a microgravity environment.

[0069] 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. An electromagnetic force displacement composite excitation screening device, characterized in that: The invention comprises a sieve plate mechanism (100), a composite excitation mechanism (200) and an auxiliary screening mechanism (300); the sieve plate mechanism (100) comprises a flexible sieve plate (101); the composite excitation mechanism (200) and the auxiliary screening mechanism (300) are both connected to the sieve plate mechanism (100); the composite excitation mechanism (200) is used to provide displacement excitation for the flexible sieve plate (101); and the auxiliary screening mechanism (300) is used to screen materials in a microgravity environment.

2. The electromagnetic force displacement composite excitation screening device according to claim 1 is characterized in that: The sieve plate mechanism (100) further comprises a fixed beam (103), two of the flexible sieve plates (101) and two of the fixed beams (103) are provided, the two flexible sieve plates (101) are arranged in parallel, and the two fixed beams (103) are arranged in parallel.

3. The electromagnetic force displacement composite excitation screening device according to claim 2 is characterized in that: The sieve plate mechanism (100) further comprises a movable beam (102), the fixed beam (103) and the movable beam (102) are arranged in parallel, and the movable beam (102) is arranged between the two fixed beams (103).

4. The electromagnetic force displacement composite excitation screening device according to claim 3 is characterized in that: One side of the flexible screen plate (101) is connected to the fixed beam (103), and the other side of the flexible screen plate (101) is connected to the movable beam (102).

5. The electromagnetic force displacement composite excitation screening device according to claim 4 is characterized in that: The two flexible screen plates (101) arranged in parallel are connected to the same movable beam (102), and the movable beam (102) can be located between the two fixed beams (103) to perform horizontal reciprocating motion.

6. The electromagnetic force displacement composite excitation screening device according to any one of claims 1 to 5, characterized in that: The sieve plate mechanism (100) further comprises a first side plate (104), a second side plate (105), a third side plate (106) and a fourth side plate (107), wherein the first side plate (104), the second side plate (105), the third side plate (106) and the fourth side plate (107) are arranged to form a rectangular cylinder.

7. The electromagnetic force displacement composite excitation screening device according to claim 6 is characterized in that: The sieve plate mechanism (100) further comprises a material receiving box (108) and a cover plate (109), wherein the material receiving box (108) is arranged at the bottom of the rectangular cylinder, and the cover plate (109) is arranged at the top of the rectangular cylinder.

8. The electromagnetic force displacement composite excitation screening device according to claim 7 is characterized in that: The flexible screen plate (101) is arranged in the rectangular cylinder, and the material receiving box (108) is located below the flexible screen plate (101).

9. The electromagnetic force displacement composite excitation screening device according to claim 6, characterized in that: The composite excitation mechanism (200) comprises a magnetic suspension drive block (201), two of the magnetic suspension drive blocks (201) are provided, and the two magnetic suspension drive blocks (201) are respectively arranged on the first side plate (104) and the second side plate (105).

10. A screening method, using the electromagnetic force displacement composite excitation screening device according to any one of claims 1 to 9 to screen materials.

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