Powder screening device

Abstract

The invention discloses a powder screening device which comprises a bottom plate and a transmission plate. A screen is arranged at one end of the transmission plate; the other end of the transmission plate penetrates through a rotating shaft and is connected with a bearing seat on the outer side to rotate; the transmission plate is connected with the bottom plate through a vibration connecting plate; the bottom of the vibration connecting plate is connected with the buffer device and then connected with the bottom plate through the buffer device; a vibration power device is arranged on the bottom plate; a vibration starting device and a sensor are arranged on the side of the transmission plate; the vibration power device drives the vibration starting device after being started, then the vibration starting device drives the transmission plate to do reciprocating motion, the screen conducts screening vibration, and in the process, the vibration speed is detected through the sensor and then fed back to the vibration power device for vibration speed adjustment. According to the powder screening device, uniform discharging of powder is achieved, and the accuracy and repeatability of a test result are improved. The amplitude is detected in real time and quickly adjusted, and uniform vibration is ensured. The structure is simple, and parts are easy to maintain and replace.

Description

Technical Field

[0001] The invention relates to the field of powder property testing instruments, in particular to a powder screening device. Background Art

[0002] Powder comprehensive property testers are widely used in the research and production of powder materials. Their physical properties such as fluidity and jetting properties have a direct impact on the production process and product quality. In order to accurately measure the comprehensive properties of powders, there are a variety of powder property testing equipment on the market. However, the existing testing equipment often makes it difficult to achieve uniform feeding during the powder feeding process due to the instability of the feeding device used, and fails to detect the amplitude during vibration feeding. The powder screening device of the existing powder property testing equipment has the following main disadvantages during the feeding process:

[0003] 1. Uneven feeding: When traditional powder feeding equipment is used for feeding, the unstable vibration leads to uneven feeding of powder, which makes the test results of comprehensive characteristics inaccurate and the repeatability varies greatly.

[0004] 2. The amplitude cannot be adjusted quickly and accurately according to different samples: During the test, due to the existing simple vibration, the amplitude of the sample cannot be adjusted in time according to the sample, resulting in low operating efficiency and inaccurate reports.

[0005] 3. Failure to detect amplitude in real time: The amplitude cannot be detected in real time during the test run. The existing instrument is not equipped with an amplitude detection device, resulting in the failure to know the amplitude in real time during the experiment, and thus the inability to observe in real time whether the vibration is uniform. There is no reference data when adjusting the amplitude, which makes the experimental efficiency low.

[0006] These shortcomings are mainly due to the lack of precise adjustment means for vibration control in the design of traditional equipment, and the inability to select appropriate feeding methods according to the different characteristics of powders. Therefore, there is an urgent need for a powder screening device that can solve the above problems. Summary of the invention

[0007] In order to solve the defects in the prior art, the present invention provides a powder screening device capable of achieving uniform powder feeding.

[0008] The present invention first provides a powder screening device, comprising a bottom plate and a transmission plate; a screen is arranged at one end of the transmission plate; the other end of the transmission plate is penetrated by a rotating shaft and connected to a bearing seat on the outside for rotation; the transmission plate is connected to the bottom plate via a vibration connecting plate; the bottom of the vibration connecting plate is connected to a buffer device, and then connected to the bottom plate via the buffer device; a vibration power device is arranged on the bottom plate; a vibration starting device and a sensor are arranged on the side of the transmission plate; after the vibration power device is started, it drives the vibration starting device, and the vibration starting device drives the transmission plate to reciprocate, so that the screen performs screening vibration, and in this process, the vibration speed is detected by the sensor and then fed back to the vibration power device for vibration speed adjustment.

[0009] The bottom plate is used to support the entire device. A screen is provided at one end of the transmission plate, and the other end is connected to the bearing seat through a rotating shaft. The mesh of the screen can be selected according to the specific powder material, and has a certain elasticity, which is used to screen the powder. The rotating shaft passes through the transmission plate and is connected to the left bearing seat and the right bearing seat on the outside. One end of the vibration connecting plate is fixed to the transmission plate by bolts, and the other end is connected to the bottom plate through a buffer device. The buffer device is fixed to the bottom of the vibration connecting plate and fixed to the bottom plate by bolts and nuts. The sensor is fixed to the side of the transmission plate to detect the vibration speed and feed it back to the control system. The vibration starting device is directly connected to the transmission plate, the vibration power device is directly connected to the bottom plate, and the transmission plate is connected to the bottom plate through the vibration connecting plate. This arrangement makes it possible for the transmission plate to be not directly connected to the bottom plate, and there can be relative displacement between the transmission plate and the bottom plate to achieve vibration action.

[0010] The base plate is the basic supporting component of the entire device. It is usually a solid metal plate with sufficient strength and stability to bear the weight of the entire device and the force generated during operation. The base plate is connected to other components, such as the electromagnet fixing plate and the linear motor fixing plate, by bolts and nuts to ensure that all components are stably mounted on it.

[0011] The transmission plate is a plate with a structure for installing a screen at one end and a through hole at the other end for the shaft to pass through. Space is reserved on both sides for installing a vibration connecting plate. A screen is set at one end of the transmission plate, and a screen sheath is wrapped around the outside of the screen. The two are fixed together by a tower buckle; the other end is connected to the left and right bearing seats through a rotating shaft. The rotating shaft passes through the transmission plate 1 and is limited by a clamp ring at both ends; a sensor is set on the side of the transmission plate for real-time monitoring of the vibration speed and feeding the data back to the control system;

[0012] The transmission plate is connected to the bottom plate via the vibration connecting plate, and the bottom of the vibration connecting plate is connected to the buffer device, thereby realizing a non-direct connection between the transmission plate and the bottom plate, allowing relative displacement, and ensuring effective vibration transmission.

[0013] The rotating shaft is a cylindrical shaft used to support and guide the movement of the transmission plate; the left bearing seat and the right bearing seat are located at both ends of the transmission plate, and bearings are installed inside to reduce friction and ensure smooth rotation of the rotating shaft. The rotating shaft passes through the transmission plate and is inserted into the left bearing seat and the right bearing seat at both ends, and is limited by a retaining ring to ensure that the rotating shaft will not fall out of the bearing seat.

[0014] The vibration connecting plate is a plate connecting the transmission plate and the bottom plate. Its shape and size design should take into account sufficient strength and flexibility to adapt to the stress changes during the vibration process; the buffer device can be a buffer pad or a buffer spring to absorb impact, reduce noise and extend the life of the equipment. One end of the vibration connecting plate is fixed to the transmission plate by welding or other means, and the other end is connected to the buffer device by bolts and nuts. The buffer device is then fixed to the bottom plate to form a flexible connection system.

[0015] The transmission plate and the vibration connecting plate are preferably connected at right angles, and the transmission plate is preferentially connected at the midline position of the vibration connecting plate, and the vibration connecting plate is arranged parallel to the rotating shaft. The advantage of such an arrangement is that the right-angle connection between the transmission plate and the vibration connecting plate enables the vibration energy to be more directly transmitted from the vibration starting device to the transmission plate. Compared with connection methods at other angles, the right-angle connection reduces energy loss and ensures efficient transmission of vibration. This design prevents excessive dispersion or attenuation of vibration energy during transmission, thereby improving screening efficiency. And the design of the right-angle connection enables the vibration energy to be better absorbed by the buffer device during transmission. Since the angle between the vibration connecting plate and the transmission plate is 90 degrees, the vibration energy will pass through a turning point during transmission, which helps to reduce the direct transmission of vibration energy and reduce noise. At the same time, the right-angle connection can also effectively isolate the vibration transmission between the transmission plate and the base plate, reduce the impact on the base plate, and further reduce the overall noise level.

[0016] The vibration connecting plate is arranged in parallel with the rotating shaft, so that the vibration connecting plate will not generate additional lateral force on the rotating shaft when transmitting vibration. This design avoids unnecessary wear or deformation of the rotating shaft caused by lateral force, and prolongs the service life of the rotating shaft and bearings. At the same time, the parallel setting also ensures that the movement trajectory of the vibration connecting plate is more stable, reducing shaking or deviation during vibration. The vibration connecting plate is arranged in parallel with the rotating shaft, making the movement trajectory of the vibration connecting plate smoother, reducing the impact and noise that may be generated during vibration. This design can also effectively reduce the friction between the vibration connecting plate and the rotating shaft, further reducing the noise level. In addition, the parallel setting also makes the movement of the vibration connecting plate smoother, reduces unnecessary vibration transmission, and improves the overall shock absorption effect.

[0017] The right-angle connection design allows the vibration energy to be transmitted in two directions, namely vertically and horizontally. This multi-directional vibration mode can act more comprehensively on the powder material on the screen, ensuring the uniform distribution of the powder material on the screen. Compared with single-direction vibration, multi-directional vibration can more effectively separate powders of different particle sizes and improve screening efficiency.

[0018] The sensor can be a grating sensor, a magnetic grating sensor or an acceleration sensor, depending on the measurement requirements. It is usually a small electronic component with high sensitivity and can accurately detect the vibration speed. The sensor is fixed on the side of the transmission plate and connected to the control system through a signal line to monitor the vibration status in real time and adjust the vibration speed as needed.

[0019] The present invention also provides the following optimization scheme:

[0020] Furthermore, the buffer device is a buffer rubber pad or a buffer spring. The buffer rubber pad or the buffer spring is fixed to the bottom of the vibration connecting plate and fixed to the bottom plate by bolts and nuts.

[0021] Furthermore, a screen sheath is provided on the outside of the screen.

[0022] The screen cover is fixed to the transmission plate, and the screen is embedded in the screen cover and fixed by external buckles. The screen has an appropriate mesh size according to the specific powder material and has a certain elasticity, which helps to improve the screening efficiency; the screen cover is a protective shell used to fix the screen to prevent it from displacement or damage during operation. The screen is embedded in the screen cover, and the two are fixed together on the top of the transmission plate to ensure that they remain in place during vibration.

[0023] The present invention provides three different vibration generation schemes, which are based on electromagnet, voice coil motor and linear motor technology. The specific implementation of each scheme is as follows:

[0024] Electromagnet vibration scheme: The electromagnet coil is fixed on the electromagnet fixing plate, and the electromagnet fixing plate is fixed on the bottom plate by bolts. The iron core fixing plate is fixed on the transmission plate by bolts, and the electromagnet iron core and the electromagnet coil are set correspondingly.

[0025] Vibrational Electric Device: An electromagnet coil is wrapped around a non-magnetic frame and when current passes through it, a magnetic field is generated around it.

[0026] Vibration starter: The electromagnet core is installed on the core fixing plate, corresponding to the electromagnet coil. When the electromagnet coil is energized, it will generate attraction or repulsion, causing the core to drive the core fixing plate to vibrate, thereby driving the transmission plate.

[0027] Voice coil motor vibration scheme: The stator of the voice coil motor is connected to the base plate, and the moving coil of the voice coil motor is fixedly connected to the transmission plate.

[0028] Vibration Power Device: The stator of a voice coil motor contains permanent magnets that produce a constant magnetic field.

[0029] Vibration starter: The moving coil of the voice coil motor contains a coil inside and is fixedly connected to the transmission plate. When current passes through, thrust is generated in the coil, pushing the moving coil to move axially. When current passes through the moving coil of the voice coil motor, it is acted upon by the Ampere force, causing the moving coil to move axially, thereby driving the transmission plate.

[0030] The stator of the voice coil motor is fixed to the voice coil motor mounting plate by bolts to ensure that its position is fixed. The voice coil motor mounting plate is then fixed to the base plate by bolts to ensure that the entire voice coil motor system is stably mounted on the base plate.

[0031] When the control system energizes the coil in the moving coil of the voice coil motor, the coil is acted upon by the Ampere force in the magnetic field generated by the stator of the voice coil motor, thereby pushing the moving coil to move axially.

[0032] Since the voice coil motor stator is fixed on the voice coil motor mounting plate, and the voice coil motor mounting plate is fixed on the bottom plate, relative displacement can be achieved between the voice coil motor moving coil and the voice coil motor stator.

[0033] This relative displacement is transmitted to the transmission plate through a mechanical connection, causing the transmission plate and the screen thereon to vibrate together, thereby achieving screening of the powder material.

[0034] Linear motor vibration solution: The linear motor stator contains a permanent magnet that generates a constant magnetic field. The linear motor mover contains a coil inside. When current passes through, it generates thrust in the coil, pushing the mover to move axially. Linear motor mounting plate: used to fix the linear motor stator and provide a stable platform. It runs through the linear motor mover to ensure that it can only slide axially without rotation or lateral displacement.

[0035] The linear motor stator is usually long or cylindrical in shape, with permanent magnets embedded inside to form a uniform magnetic field. The linear motor stator is fixed to the linear motor mounting plate by bolts to ensure that it is fixed in place. The linear motor mover is a movable part containing coils and is designed to slide smoothly on the linear track. The linear motor mover is fixed directly to the transmission plate and slides axially through the connecting column. The connecting column runs through the linear motor mover and restricts its movement direction to ensure that it can only move in the axial direction. The connecting column is one or more smooth metal rods with moderate diameter and a precision-machined surface to reduce friction. The connecting column is fixed to the linear motor mounting plate at both ends and runs through the linear motor mover to ensure that the linear motor mover can slide freely on the connecting column but cannot be separated from the connecting column.

[0036] The linear motor mounting plate is a solid metal plate with sufficient strength and stability to support the linear motor stator and connecting column. The linear motor mounting plate is fixed to the base plate by bolts to ensure that the entire linear motor system is stably mounted on the base plate.

[0037] The linear motor mover is not directly fixed on the linear motor mounting plate, but slides axially along a connecting column that passes through the linear motor mover. The connecting column and the linear motor mounting plate are fixedly connected, and the linear motor mounting plate is fixed to the bottom plate by bolts, so as to achieve relative displacement between the linear motor mover and the linear motor stator.

[0038] When the control system energizes the coil in the linear motor mover, the coil is subjected to the Ampere force in the magnetic field generated by the linear motor stator, thereby pushing the linear motor mover to slide axially along the connecting column. Since the connecting column is fixed to the linear motor mounting plate, and the linear motor mounting plate is fixed to the bottom plate, relative displacement can be achieved between the linear motor mover and the linear motor stator. This relative displacement causes the transmission plate connected to the linear motor mover to displace and vibrate, so that the powder material on the screen can be evenly screened.

[0039] Furthermore, a left bearing seat and a right bearing seat are arranged on both sides of the rotating shaft.

[0040] The left bearing seat and the right bearing seat are fixed at two ends of the transmission plate, and the rotating shaft passes through the transmission plate and connects the left bearing seat and the right bearing seat on the outside.

[0041] In the three schemes, the components of the vibration starting device and the vibration power device can be interchanged, and the essence is that as long as relative displacement can be achieved, it will be fine.

[0042] The beneficial effects of the present invention are:

[0043] This patented technology aims to solve the technical problems of poor feeding uniformity, inconvenient amplitude control, and inability to detect the amplitude in real time in the feeding process of existing powder property testing equipment. When measuring the angle of repose, scraping angle, collapse angle, loose density, tap density, and cohesion of the powder accumulation layer, uniform feeding is required to ensure that the powder falls naturally and evenly, so that the comprehensive characteristics of the powder can be obtained accurately. The present invention uses a powder comprehensive property tester with three vibration modes: electromagnet, voice coil motor, and linear motor to vibrate and feed the material evenly. By introducing magnetic grating sensors, grating sensors, and acceleration sensors to detect the amplitude in real time, the amplitude uniformity and amplitude adjustment direction can be quickly known, making the adjustment more convenient, the noise less, and the powder feeding and processing uniform during operation, thereby improving the accuracy and repeatability of the test results and expanding the scope of application of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural diagram of the scheme 1 of the powder screening device of the present invention;

[0045] Figure 2 It is a structural diagram of the vibration power device and the vibration starting device of the second scheme of the powder screening device of the present invention;

[0046] Figure 3 A structural diagram of a vibration power device and a vibration starting device of scheme 3 of the powder screening device of the present invention;

[0047] The specific drawings are as follows:

[0048] 1 transmission plate; 2 bottom plate; 3 buffer device; 4; vibration connecting plate; 5 iron core fixing plate; 6 electromagnet iron core; 7 left bearing seat; 8 rotating shaft; 9 right bearing seat; 10 sensor grating sensor, magnetic grating sensor, acceleration sensor; 11 electromagnet fixing plate; 12 electromagnet coil; 13 retaining ring; 14 bearing; 15 screen sleeve; 16 screen; 17 voice coil motor stator; 18 voice coil motor mounting plate; 19 voice coil motor moving coil; 20 linear motor stator; 21 linear motor fixing plate; 22 linear motor mover. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solution of the invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0050] The invention discloses a powder screening device, comprising a bottom plate 2 and a transmission plate 1; a screen 16 is arranged at one end of the transmission plate 1; the other end of the transmission plate 1 is penetrated by a rotating shaft 8 and connected to a bearing seat on the outside for rotation; the transmission plate 1 is connected to the bottom plate 2 via a vibration connecting plate 4; the bottom of the vibration connecting plate 4 is connected to a buffer device 3, and then connected to the bottom plate 2 via the buffer device 3; a vibration power device is arranged on the bottom plate 2; a vibration starting device and a sensor 10 are arranged on the side of the transmission plate 1; after the vibration power device is started, it drives the vibration starting device, and the vibration starting device drives the transmission plate 1 to reciprocate, so that the screen 16 performs screening vibration, and in this process, the vibration speed is detected by the sensor 10 and then fed back to the vibration power device for vibration speed adjustment.

[0051] The bottom plate 2 is a metal plate, usually made of high-strength steel, with sufficient rigidity and stability to support the entire device. Its surface is precisely machined to ensure the accuracy of all mounting holes. The bottom plate 2 is fixed to the main body by bolts and carries all other components. There are multiple mounting holes on the bottom plate 2 for fixing components such as the electromagnet fixing plate 11, the linear motor fixing plate 21, and the voice coil motor mounting plate 18 to ensure the stability and reliability of each component. The bottom plate 2 serves as the basic support of the entire device, providing a stable platform to ensure that the device will not shake or shift during operation, thereby improving the accuracy and efficiency of screening.

[0052] The transmission plate 1 is a metal plate, one end of which is designed with a structure for installing a screen 16, and the other end is provided with a through hole for the shaft 8 to pass through, and space is reserved on both sides for installing the vibration connecting plate 4. The material of the transmission plate 1 is preferably stainless steel to improve corrosion resistance and service life. A screen 16 is provided at one end of the transmission plate 1, and a screen sheath 15 is wrapped around the outside of the screen 16, and the two are fixed together by a tower buckle; the other end is connected to the left bearing seat 7 and the right bearing seat 9 through the shaft 8, and the shaft 8 passes through the transmission plate 1 and is limited by a clamp 13 at both ends; a sensor 10 is provided on the side for real-time monitoring of the vibration speed and feeding back the data to the control system.

[0053] The transmission plate 1 is connected to the bottom plate 2 via the vibration connection plate 4, and the bottom of the vibration connection plate 4 is connected to the buffer device 3, thereby realizing an indirect connection with the bottom plate 2, allowing relative displacement and ensuring effective vibration transmission. As the core component of vibration transmission, the transmission plate 1 ensures that the vibration can be efficiently transmitted to the screen 16 to achieve uniform screening of the powder. At the same time, the flexible connection design reduces the impact of vibration on the bottom plate 2 and extends the service life of the equipment.

[0054] The screen 16 is preferably a stainless steel mesh with a certain elasticity. The appropriate mesh size can be selected according to the specific powder material for screening the powder. The edge of the screen 16 is reinforced to increase its durability. The screen 16 is embedded in the screen jacket 15, and the screen jacket 15 is fixed on the transmission plate 1 and fixed by external buckles to ensure that it remains in position during vibration. The design of the screen 16 can not only effectively screen powders of different particle sizes, but also has good elasticity and wear resistance, and can maintain stable performance under long-term vibration, reduce replacement frequency, and reduce maintenance costs.

[0055] The rotating shaft 8 is a cylindrical metal rod, usually made of high-strength steel, used to support and guide the movement of the transmission plate 1. The surface of the rotating shaft 8 is precisely machined to ensure its smoothness and concentricity and reduce friction. The rotating shaft 8 passes through the transmission plate 1 and is inserted into the left bearing seat 7 and the right bearing seat 9 at both ends. The retaining ring 13 is used to limit the rotating shaft 8 to ensure that the rotating shaft 8 will not fall out of the bearing seat. The design of the rotating shaft 8 ensures the smooth rotation of the transmission plate 1, avoids the problem of uneven vibration caused by friction or eccentricity, and improves the accuracy and efficiency of screening.

[0056] The left bearing seat 7 and the right bearing seat 9 are cylindrical metal seats with bearings 14 installed inside, usually ball bearings made of steel, to reduce friction and ensure smooth rotation of the shaft 8. The outer shell of the bearing seat is precisely machined to ensure the installation accuracy with the transmission plate 1. The left bearing seat 7 and the right bearing seat 9 are fixed at both ends of the transmission plate 1. The shaft 8 passes through the transmission plate 1 and connects the left bearing seat 7 and the right bearing seat 9 on the outside to support the rotation of the transmission plate 1 and ensure its stable vibration. The design of the bearing seat ensures stable support of the shaft 8, reduces friction and wear, extends the service life of the equipment, and improves the stability and consistency of vibration.

[0057] The vibration connecting plate 4 is a strip-shaped metal plate, usually made of high-strength steel, used to transmit vibration. The length and width of the vibration connecting plate 4 are optimized according to actual needs to ensure sufficient strength and flexibility. One end of the vibration connecting plate 4 is fixed to the transmission plate 1 by welding or other means, and the other end is connected to the base plate 2 through the buffer device 3. The buffer device 3 is fixed to the base plate 2 by bolts and nuts to form a flexible connection system. The design of the vibration connecting plate 4 allows relative displacement between the transmission plate 1 and the base plate 2, reduces the impact of vibration on the base plate 2, reduces noise, and improves the stability and reliability of the system.

[0058] The buffer device 3 can be a buffer rubber pad or a buffer spring, which is used to absorb and release vibration energy, reduce the impact of vibration on the base plate 2, extend the life of the equipment and reduce noise. The buffer rubber pad is a round or rectangular rubber pad, and the buffer spring is a spiral spring. The specific shape and size are optimized according to actual needs. The buffer rubber pad or buffer spring is fixed to the bottom of the vibration connecting plate 4 and fixed to the base plate 2 by bolts and nuts to ensure a good buffering effect. The design of the buffer device 3 effectively absorbs vibration energy, reduces the impact of vibration on the base plate 2, reduces noise, extends the service life of the equipment, and improves the stability and reliability of the system.

[0059] The sensor 10 can be a grating sensor, a magnetic grating sensor or an acceleration sensor, and the specific type depends on the measurement requirements. It is usually a small electronic component with high sensitivity and can accurately detect the vibration speed. The outer shell of the sensor 10 is sealed to prevent dust and moisture from entering, ensuring that it can still work normally in harsh environments. The sensor 10 is fixed to the side of the transmission plate 1 and is connected to the control system through a signal line to monitor the vibration state in real time and adjust the vibration speed as needed. The design of the sensor 10 can monitor the vibration speed in real time and feed the data back to the control system to ensure the precise control of the vibration frequency and amplitude, improve the accuracy and efficiency of screening, and can be quickly adjusted according to different powder materials to adapt to a variety of application scenarios.

[0060] The present invention adopts three vibration schemes with slightly different structures but similar vibration principles.

[0061] Solution 1 is an electromagnet vibration solution, which is composed of an electromagnet coil 12, an electromagnet core 6, and an iron core fixing plate 5.

[0062] The electromagnet coil 12 is composed of multiple layers of wires wound on a non-magnetic frame, and when current passes through, a magnetic field is generated around it. The electromagnet coil 12 is fixed on the electromagnet fixing plate 11, and the electromagnet fixing plate 11 is fixed to the base plate 2 by bolts. In this way, the electromagnet coil 12 remains stationary and does not move with the transmission plate 1. The electromagnet core 6 is a cylindrical or square metal core, usually made of soft magnetic materials such as silicon steel sheets, which can be attracted or repelled by the magnetic field generated by the electromagnet coil 12 when power is turned on. The electromagnet core 6 is mounted on the core fixing plate 5, and the core fixing plate 5 is fixed to the transmission plate 1 by bolts. The electromagnet core 6 corresponds to the electromagnet coil 12 to ensure that the magnetic field between the two can effectively transmit force.

[0063] The core fixing plate 5 is a rectangular metal plate, preferably made of stainless steel, with sufficient strength and stability, and is used to fix the electromagnet core 6. The core fixing plate 5 is fixed to the transmission plate 1 by bolts to ensure that the electromagnet core 6 can vibrate with the transmission plate 1.

[0064] The specific working principle of scheme 1 is as follows: when the control system energizes the electromagnet coil 12, the current flowing through the coil will generate a strong magnetic field around it. This magnetic field will attract or repel the electromagnet core 6, depending on the direction of the current. Since the electromagnet core 6 is fixed on the transmission plate 1, the movement of the core 6 will directly drive the transmission plate 1 to vibrate. After being affected by the magnetic field, the electromagnet core 6 will move axially, push or pull the core fixing plate 5, and then drive the entire transmission plate 1 to vibrate. This vibration is transmitted to the screen 16 through the rotating shaft 8 and the bearing seat, so that the powder material on the screen 16 can be evenly screened. The sensor 10 monitors the vibration speed of the transmission plate 1 in real time and feeds the data back to the control system. The control system adjusts the current size and direction of the electromagnet coil 12 according to the feedback from the sensor 10, thereby accurately controlling the vibration frequency and amplitude. The buffer device 3 absorbs and releases vibration energy, reduces the impact of vibration on the bottom plate 2, and ensures the stability and reliability of the device.

[0065] Solution 2 is a voice coil motor vibration solution, which is composed of a voice coil motor stator 17 , a voice coil motor moving coil 19 , and a voice coil motor mounting plate 18 .

[0066] The voice coil motor stator 17 includes a permanent magnet, which is usually annular or cylindrical, and has multiple permanent magnets embedded inside to form a uniform magnetic field. The voice coil motor stator 17 is fixed to the voice coil motor mounting plate 18 by bolts, and the voice coil motor mounting plate 18 is further fixed to the bottom plate 2 by bolts. In this way, the voice coil motor stator 17 remains stationary and does not move with the transmission plate 1.

[0067] The moving coil 19 of the voice coil motor is a movable part containing a coil, usually wound on a lightweight frame, and designed to slide smoothly on a linear track. The material of the moving coil is selected to be lightweight and high-strength to reduce inertia and increase response speed. The moving coil 19 of the voice coil motor is fixed to the transmission plate 1 to ensure that it can vibrate with the transmission plate 1. The moving coil 19 corresponds to the stator 17 of the voice coil motor to ensure that the magnetic field between the two can effectively transmit force.

[0068] The voice coil motor mounting plate 18 is a solid metal plate with sufficient strength and stability for supporting the voice coil motor stator 17. The voice coil motor mounting plate 18 is fixed to the bottom plate 2 by bolts to ensure that the voice coil motor stator 17 remains stationary.

[0069] The working principle of the second scheme is as follows: when the control system energizes the coil in the moving coil 19 of the voice coil motor, the current flowing through the coil will be affected by the Ampere force in the magnetic field generated by the stator 17 of the voice coil motor. This force will push or pull the moving coil 19 to move it axially. Since the moving coil 19 is fixed on the transmission plate 1, the movement of the moving coil 19 will directly drive the transmission plate 1 to vibrate. After being affected by the magnetic field, the moving coil 19 of the voice coil motor will move axially, push or pull the transmission plate 1, and then drive the entire transmission plate 1 to vibrate. This vibration is transmitted to the screen 16 through the rotating shaft 8 and the bearing seat, so that the powder material on the screen 16 can be evenly screened. The sensor 10 monitors the vibration speed of the transmission plate 1 in real time and feeds back the data to the control system. The control system adjusts the current size and direction of the moving coil 19 of the voice coil motor according to the feedback of the sensor 10, so as to accurately control the vibration frequency and amplitude. The buffer device 3 absorbs and releases vibration energy, reduces the impact of vibration on the bottom plate 2, and ensures the stability and reliability of the device.

[0070] Solution three is a linear motor vibration solution, which is composed of a linear motor stator 20 , a linear motor mover 22 , and a linear motor mounting plate 21 .

[0071] The linear motor stator 20 includes a permanent magnet, which is usually in the shape of a long strip or a cylinder, and a plurality of permanent magnets are embedded inside to form a uniform magnetic field. The linear motor stator 20 is fixed to the linear motor fixing plate 21 by bolts, and the linear motor fixing plate 21 is fixed to the base plate 2 by bolts. In this way, the linear motor stator 20 remains stationary and does not move with the transmission plate 1. The linear motor mover 22 is a movable component including a coil, which is designed to slide axially along the connecting column. The connecting column runs through the linear motor mover 22 to ensure that it can only move axially without rotation or lateral displacement. The material of the linear motor mover 22 is selected to be lightweight and high-strength material to reduce inertia and improve response speed. One end of the connecting column is fixed to the linear motor mounting plate 21, and the other end passes through the linear motor mover 22 to ensure that the linear motor mover 22 can slide freely on the connecting column. The linear motor mover 22 is fixed to the transmission plate 1 by some mechanical connection, such as a flexible connector, a guide rod, etc., to ensure that it can vibrate with the transmission plate 1. The linear motor mover 22 corresponds to the linear motor stator 20 to ensure that the magnetic field between the two can effectively transmit force.

[0072] The linear motor mounting plate 21 is a solid metal plate with sufficient strength and stability for supporting the linear motor stator 20. The linear motor mounting plate 21 is fixed to the base plate 2 by bolts to ensure that the linear motor stator 20 remains stationary.

[0073] The working principle of scheme 3 is as follows: when the control system energizes the linear motor stator 20, the permanent magnet inside the linear motor stator 20 interacts with the coil in the linear motor mover 22 to generate thrust. This thrust will push or pull the linear motor mover 22 to move axially along the connecting column. Since the linear motor mover 22 is fixed on the transmission plate 1, the movement of the linear motor mover 22 will directly drive the transmission plate 1 to vibrate.

[0074] When the linear motor mover 22 is affected by the magnetic field, it will move axially along the connecting column, push or pull the transmission plate 1, and then drive the entire transmission plate 1 to vibrate. This vibration is transmitted to the screen 16 through the rotating shaft 8 and the bearing seat, so that the powder material on the screen 16 can be evenly screened.

[0075] The sensor 10 monitors the vibration speed of the transmission plate 1 in real time and feeds the data back to the control system. The control system adjusts the current size and direction of the linear motor stator 20 according to the feedback of the sensor 10, thereby accurately controlling the vibration frequency and amplitude. The buffer device 3 absorbs and releases the vibration energy, reduces the impact of the vibration on the bottom plate 2, and ensures the stability and reliability of the device.

[0076] The powder screening device provided by the present invention realizes efficient vibration transmission and precise vibration control through three different vibration generation schemes: electromagnet, voice coil motor and linear motor. Whether it is a simple electromagnet system, a high-precision voice coil motor or a high-efficiency linear motor, it can ensure the uniform separation of powder materials on the screen and improve the screening efficiency and quality.

[0077] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A powder screening device, characterized in that: It includes a base plate and a transmission plate; a screen is arranged at one end of the transmission plate; the other end of the transmission plate is penetrated by a rotating shaft and connected to a bearing seat on the outside for rotation; the transmission plate is connected to the base plate via a vibration connecting plate; the bottom of the vibration connecting plate is connected to a buffer device, and then connected to the base plate via the buffer device; a vibration power device is arranged on the base plate; a vibration starting device and a sensor are arranged on the side of the transmission plate; after the vibration power device is started, it drives the vibration starting device, and the vibration starting device drives the transmission plate to reciprocate, so that the screen performs screening vibration, and in this process, the vibration speed is detected by the sensor and then fed back to the vibration power device for vibration speed adjustment.

2. The powder screening device according to claim 1, characterized in that: The buffer device is a buffer rubber pad or a buffer spring.

3. The powder screening device according to claim 1, characterized in that: A screen sheath is arranged on the outside of the screen.

4. The powder screening device according to claim 1, characterized in that: The vibration power device is an electromagnet coil.

5. The powder screening device according to claim 4, characterized in that: The vibration starting device is an electromagnet core.

6. The powder screening device according to claim 1, characterized in that: The vibration power device is a voice coil motor stator.

7. The powder screening device according to claim 6, characterized in that: The vibration starting device is a voice coil motor moving coil.

8. The powder screening device according to claim 1, characterized in that: The vibration power device is a linear motor stator.

9. The powder screening device according to claim 1, characterized in that: The vibration starting device is a linear motor mover.

10. The powder screening device according to claim 1, characterized in that: A left bearing seat and a right bearing seat are arranged on both sides of the rotating shaft.

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