An amplitude-adjustable veterinary fine powder particle grading and screening vibration device
Patent Information
- Application Number
- CN202522617654.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-10
AI Technical Summary
[0003]有鉴于此，本实用新型提供一种振幅可调的兽药细粉颗粒分级筛分振动装置，能够解决现有技术中存在兽药细粉颗粒在筛分过程中振幅无法根据不同粒径分布进行调节导致筛分效率低下的技术问题
[0014]本实用新型通过在振动驱动组件的连接轴上设置偏心块，并在偏心块外周配置可调节位置的调节环，利用调节环内圆周面与偏心块外圆周面之间的线接触配合关系，实现了振幅的连续可调，当调节环相对于偏心块的位置发生改变时，偏心块旋转产生的离心力作用点随之变化，从而改变了传递至筛分箱体的振动幅度。这种结构设计解决了传统固定振幅装置的局限性，偏心块外圆周面上设置的弧形凸台与调节环内圆周面的弧形凹槽形成精确配合，凹槽深度大于凸台高度所形成的可调节间隙，使得操作人员可以根据兽药粉末的实际粒径分布，在不停机的情况下通过旋转调节环来改变偏心块的有效偏心距，进而调整振动幅度，对于细粉含量高的物料，减小振幅可以降低粉尘飞扬并防止筛网孔堵塞，而对于粗颗粒为主的物料，增大振幅则能够加快颗粒在筛网上的移动速度，缩短筛分周期，同时振动驱动组件与筛分箱体底部的面接触连接保证了振动能量的均匀传递，避免了应力集中导致的连接部位疲劳损坏，筛分箱体侧壁与振动驱动组件外壳之间的弹性支撑件抵接结构，既提供了必要的支撑刚度，又通过弹性变形吸收了过大的振动冲击，保护了装置的整体结构。综上所述，本实用新型解决了背景技术中提到的兽药细粉颗粒在筛分过程中振幅无法根据不同粒径分布进行调节导致筛分效率低下的技术问题。
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Figure CN224894759U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of veterinary drug technology, specifically, it relates to a vibration device for grading and screening fine powder particles of veterinary drugs with adjustable amplitude. Background Technology
[0002] In the field of veterinary drug production, the grading and sieving of fine powder particles is a key process to ensure the uniformity of drug quality. Traditional vibrating sieving devices are widely used for particle size classification of veterinary drug powders. These devices typically use a vibrating motor with a fixed frequency and fixed amplitude to drive the screen to reciprocate, separating particles of different sizes through the difference in screen aperture. In actual production, due to fluctuations in production process parameters, different batches of veterinary drug raw material powders have significantly different particle size distribution characteristics. Some batches may have a high content of fine powder, while other batches may have a high proportion of coarse particles. Existing fixed amplitude sieving devices cannot adapt to this variation in particle size distribution. When processing materials with a high content of fine powder, excessive amplitude will cause fine powder to fly and screen to clog. When processing materials with a predominance of coarse particles, insufficient amplitude will cause particles to stay on the screen for too long, significantly reducing sieving efficiency. In current vibrating screening technology, some devices adjust amplitude by replacing eccentric blocks with different eccentric masses or by adjusting the motor speed. However, replacing eccentric blocks requires stopping the machine for disassembly, which is time-consuming, labor-intensive, and cannot achieve continuous adjustment. While adjusting the motor speed can change the vibration frequency, it provides poor amplitude control precision and can easily affect the stability of the screening effect. Other devices attempt to achieve amplitude adjustment by adding complex mechanical transmission mechanisms, but the introduction of these mechanisms increases the size of the device and the potential for failure, reduces reliability, and significantly increases maintenance costs. In a closed production environment, these complex mechanisms may also become a hidden danger for dust accumulation and microbial growth, failing to meet the hygiene requirements of veterinary drug production. In other words, existing technologies suffer from the technical problem that the amplitude of veterinary drug fine powder particles cannot be adjusted according to different particle size distributions during screening, resulting in low screening efficiency. Utility Model Content
[0003] In view of this, the present invention provides a vibration device for grading and screening fine veterinary drug powder particles with adjustable amplitude, which can solve the technical problem in the prior art that the amplitude of the vibration of fine veterinary drug powder particles cannot be adjusted according to different particle size distributions during the screening process, resulting in low screening efficiency.
[0004] This utility model is implemented as follows: This utility model provides a vibration device for grading and screening fine veterinary drug powder particles with adjustable amplitude, including a screening box, a vibration drive assembly, and an amplitude adjustment mechanism. The screening box is provided with a screen layer. The vibration drive assembly is connected to the bottom surface of the screening box through a connecting shaft. The amplitude adjustment mechanism includes an eccentric block and an adjusting ring. The eccentric block is disposed on the connecting shaft. The adjusting ring is sleeved on the outer circumferential surface of the eccentric block and is in line contact with the outer circumferential surface of the eccentric block. An adjustable gap is formed between the inner circumferential surface of the adjusting ring and the outer circumferential surface of the eccentric block. The side wall of the screening box and the outer shell of the vibration drive assembly abut against each other through an elastic support member.
[0005] The eccentric block has an arc-shaped protrusion on its outer circumference, extending along the circumference of the eccentric block. The vibration drive assembly is connected to the bottom of the screening box via surface contact, ensuring uniform transmission of vibration energy and avoiding stress concentration issues caused by point or line contact. Simultaneously, the line contact between the adjusting ring and the outer circumference of the eccentric block, and the abutment structure between the side wall of the screening box and the outer shell of the vibration drive assembly via elastic supports, enable precise amplitude adjustment. This allows for effective grading of fine veterinary drug powder particles of different sizes under controllable vibration amplitude, improving screening efficiency and solving the technical problem that traditional fixed-amplitude screening devices cannot adjust vibration parameters according to different material characteristics.
[0006] The inner circumferential surface of the adjusting ring is provided with an arc-shaped groove that matches the arc-shaped boss, and the depth of the arc-shaped groove is greater than the height of the arc-shaped boss. The arc-shaped boss on the outer circumferential surface of the eccentric block extends along the circumferential direction, forming a continuous guiding effect with the adjusting ring during the rotation of the eccentric block, making the vibration transmission more stable, reducing the impact and noise during vibration. At the same time, the arc-shaped boss increases the contact stability between the eccentric block and the adjusting ring, preventing deviation and separation during high-speed rotation, and ensuring the reliability and consistency of amplitude adjustment during long-term use.
[0007] The bottom of the screening box is equipped with a conical guide surface, the apex of which faces downwards from the screen layer. The inclination angle of the conical guide surface is 30 to 60 degrees. This conical guide surface design, with its apex facing downwards from the screen layer, allows the screened particles to slide along the conical guide surface to the periphery under the combined action of gravity and vibration. This prevents particle accumulation and retention at the bottom of the box. Simultaneously, the 30 to 60 degree inclination angle balances guide efficiency and particle sliding speed, ensuring smooth particle discharge while preventing secondary mixing caused by excessively rapid sliding, thus improving the accuracy of the grading and screening.
[0008] The axial length of the connecting shaft is greater than the thickness of the bottom of the screening box, and the connecting shaft passes through the central hole at the bottom of the screening box. This design, where the axial length of the connecting shaft exceeds the thickness of the bottom of the screening box, allows the connecting shaft to completely pass through the central hole at the bottom of the screening box and form effective support and fixation on both sides. This through-type connection structure enhances the bonding strength between the connecting shaft and the screening box, enabling it to withstand greater vibration loads and torques, preventing loosening and displacement caused by long-term vibration, and facilitating maintenance and replacement of the connecting shaft, thus extending the service life of the device.
[0009] The elastic support component is in the shape of a helical spring. Its upper end is fixedly connected to the outer surface of the side wall of the screening box, and its lower end is fixedly connected to the bottom of the housing of the vibration drive assembly. This helical spring structure, with its upper end fixed to the outer surface of the side wall of the screening box and its lower end fixed to the bottom of the housing of the vibration drive assembly, forms a flexible support system. During vibration, the helical spring absorbs and buffers vibration energy while maintaining the relative stability of the screening box, reducing the transmission of vibration to the external environment and lowering the overall vibration noise. Simultaneously, this support method allows the screening box to vibrate freely within the elastic range of the spring, improving the screening effect.
[0010] The screen layer comprises an upper screen and a lower screen. The mesh size of the upper screen is larger than that of the lower screen, and a spacer support column is provided between the upper and lower screens. By using this double-layer screen structure with a larger mesh size in the upper screen than in the lower screen, two-stage grading of fine veterinary drug powder particles is achieved. Larger particles are retained by the upper screen, medium-sized particles are retained by the lower screen after passing through the upper screen, and fine particles pass through both screens. The spacer support column ensures a reasonable distance between the two screens, avoiding interference and clogging, and improving grading capacity and accuracy.
[0011] The screening chamber is made of stainless steel, with sidewall thickness ranging from 2mm to 5mm. The stainless steel construction utilizes its corrosion resistance to accommodate the potential chemical activity and corrosiveness of veterinary drug powders, ensuring the device maintains structural integrity and surface cleanliness even after prolonged contact with the powders. Furthermore, the 2mm to 5mm sidewall thickness design controls overall weight while maintaining chamber strength and rigidity, reducing the load on vibration drive components and improving energy efficiency and vibration response speed.
[0012] The eccentric block has a disc-shaped structure, and its geometric center is offset from the axis of the connecting shaft, forming an eccentricity. This disc-shaped structure and the eccentricity generated by the offset between the geometric center and the axis of the connecting shaft produce a periodic centrifugal force when the connecting shaft rotates. This centrifugal force is transmitted to the screening box through surface contact, causing the box to vibrate. The disc-shaped structure ensures the symmetry of the eccentric block's mass distribution, reducing unbalanced vibration and additional loads during rotation. Simultaneously, it allows for precise control of the vibration amplitude by changing the eccentricity or the position of the adjusting ring, achieving flexible amplitude adjustment.
[0013] The adjusting ring has multiple evenly distributed adjusting holes on its outer circumference, which extend along the axial direction of the adjusting ring. The number of adjusting holes ranges from four to eight. These four to eight evenly distributed adjusting holes on the outer circumference of the adjusting ring provide multiple fixed position options for amplitude adjustment. By inserting locating pins or fasteners into different adjusting holes, the angular position of the adjusting ring relative to the eccentric block can be quickly locked, thereby achieving graded amplitude adjustment. The evenly distributed hole design ensures the uniformity and repeatability of the amplitude at each grade. Simultaneously, the axial extension of the adjusting holes facilitates the installation and removal of fasteners, simplifying the amplitude adjustment operation and improving ease of use.
[0014] This invention achieves continuous adjustment of the amplitude by setting an eccentric block on the connecting shaft of the vibration drive assembly and configuring an adjustable ring on the outer periphery of the eccentric block. By utilizing the line contact between the inner circumferential surface of the adjusting ring and the outer circumferential surface of the eccentric block, the position of the vibration is continuously adjustable. When the position of the adjusting ring relative to the eccentric block changes, the point of application of the centrifugal force generated by the rotation of the eccentric block changes accordingly, thereby changing the vibration amplitude transmitted to the screening box. This structural design overcomes the limitations of traditional fixed amplitude devices. The arc-shaped boss on the outer circumference of the eccentric block and the arc-shaped groove on the inner circumference of the adjusting ring form a precise fit. The adjustable gap formed by the groove depth being greater than the boss height allows the operator to change the effective eccentricity of the eccentric block by rotating the adjusting ring without stopping the machine, based on the actual particle size distribution of the veterinary drug powder. This, in turn, adjusts the vibration amplitude. For materials with a high fine powder content, reducing the amplitude can reduce dust emission and prevent screen clogging. For materials with predominantly coarse particles, increasing the amplitude can accelerate the movement of particles on the screen and shorten the screening cycle. At the same time, the surface contact connection between the vibration drive component and the bottom of the screening box ensures uniform transmission of vibration energy, avoiding fatigue damage to the connection parts caused by stress concentration. The elastic support structure between the side wall of the screening box and the outer shell of the vibration drive component provides necessary support rigidity and absorbs excessive vibration impact through elastic deformation, protecting the overall structure of the device. In summary, this utility model solves the technical problem mentioned in the background art where the amplitude of veterinary drug fine powder particles cannot be adjusted according to different particle size distributions during the sieving process, resulting in low sieving efficiency. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0016] Figure 2 This is a cross-sectional structural diagram of the amplitude adjustment mechanism.
[0017] Figure 3 This is a schematic diagram of the screen layer structure.
[0018] In the attached drawings, the reference numerals are explained as follows: 01, screening box; 02, vibration drive assembly; 03, amplitude adjustment mechanism; 04, screen layer; 05, connecting shaft; 06, eccentric block; 07, adjusting ring; 08, elastic support component; 09, conical guide surface; 10, arc-shaped boss; 11, arc-shaped groove; 12, upper screen; 13, lower screen; 14, spacer support column; 15, adjusting hole; 16, vibration motor; 161, outer shell; 171, first discharge port; 172, second discharge port; 173, third discharge port. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model are described clearly and completely below.
[0020] This utility model provides a vibrating device for grading and screening fine veterinary drug powder particles with adjustable amplitude, including a screening box 01, a vibration drive assembly 02, an amplitude adjustment mechanism 03, and a screen layer 04. The screening box 01 is made of 304 stainless steel sheet and is a cuboid structure with a length of 800mm, a width of 600mm, a height of 400mm, and a side wall thickness of 3mm. The top opening of the screening box 01 is used to put in the fine veterinary drug powder particles to be screened. A conical guide surface 09 is provided at the bottom. The apex of the conical guide surface 09 is located at the geometric center of the bottom of the box and faces downwards towards the screen layer 04. The angle of inclination of the conical guide surface 09 with the horizontal plane is 45 degrees. The conical surface is mirror polished to reduce particle adhesion. The vibration drive assembly 02 includes a vibration motor 16 and a housing 161. The vibration motor is a three-phase asynchronous motor with a rated power of 1.5kW and a speed of 1440r / min. The housing is made of cast aluminum alloy and has a flat bottom for mounting on a support base. The connecting shaft 05 is a cylindrical stainless steel shaft with a diameter of 30mm and an axial length of 150mm. One end of the connecting shaft 05 is rigidly connected to the output shaft of the vibration motor via a flange, and the other end passes through a circular through-hole with a diameter of 32mm at the center of the bottom of the screening box 01. The connecting shaft 05 and the bottom of the screening box 01 are connected by welding to achieve surface contact, with a weld width of 5mm, ensuring full transmission of vibration energy.
[0021] The amplitude adjustment mechanism 03 includes an eccentric block 06 and an adjustment ring 07. The eccentric block 06 is a disc-shaped structure made of No. 45 carbon steel, with a diameter of 120mm and a thickness of 20mm. The eccentric block 06 is fixedly connected to the connecting shaft 05 through a keyway with a width of 8mm. The eccentricity of the geometric center of the eccentric block 06 is 15mm away from the axis of the connecting shaft 05. An arc-shaped boss 10 is provided on the outer circumference of the eccentric block 06 along the circumferential direction. The central angle of the arc-shaped boss 10 is 90 degrees, the height of the boss is 3mm, and the width is 10mm. The outer surface of the arc-shaped boss 10 is a smooth arc surface. The adjusting ring 07 is a ring structure with an inner diameter of 126mm, an outer diameter of 160mm, and a thickness of 20mm, the same as the eccentric block 06. The adjusting ring 07 is made of aluminum alloy to reduce weight. The inner circumference of the adjusting ring 07 is provided with an arc-shaped groove 11 that matches the arc-shaped boss 10. The central angle of the arc-shaped groove 11 is 95 degrees, the depth is 5mm, and the width is 12mm. The groove depth is greater than the height of the boss, forming a 2mm fitting gap. This gap allows the adjusting ring 07 to be angled relative to the eccentric block 06. Six adjusting holes 15 are evenly distributed along the circumference on the outer circumference of the adjusting ring 07. The adjusting holes 15 are circular through holes with a diameter of 10mm, passing through the axial direction of the adjusting ring 07. The central angle between two adjacent adjusting holes 15 is 60 degrees. By inserting positioning pins into different adjusting holes 15 and tightening them, the adjusting ring 07 can be fixed at different angular positions relative to the eccentric block 06, thereby realizing the graded adjustment of the amplitude.
[0022] The screen layer 04 includes an upper screen 12 and a lower screen 13. Both the upper screen 12 and the lower screen 13 are woven from 304 stainless steel wire. The upper screen 12 has a mesh size of 80 mesh (approximately 180 μm), and the lower screen 13 has a mesh size of 120 mesh (approximately 125 μm). The effective screening area of both screens is 0.4. The upper screen 12 is installed inside the screening box 01 at a distance of 100mm from the top opening of the box, and the lower screen 13 is installed at a distance of 150mm below the upper screen 12. The two screens are separated by four spacer support columns 14. The spacer support columns 14 are cylindrical stainless steel rods with a diameter of 12mm and a length of 150mm. The upper end of the support column is welded to the frame of the upper screen 12, and the lower end is welded to the frame of the lower screen 13. The four support columns are located at the four corners of the screens, ensuring the relative position stability of the two screens during vibration.
[0023] The elastic support 08 is a helical compression spring made of 65Mn spring steel, with a spring wire diameter of 5mm, an outer diameter of 50mm, a free length of 200mm, and a stiffness coefficient of 8N / mm. Each of the four side walls of the screening box 01 has a mounting base welded to its lower part. The upper end of the elastic support 08 is fixed to the mounting base with bolts, and the lower end is fixed to the support bases set at the four corners of the bottom of the housing of the vibration drive assembly 02. The four elastic support 08 are arranged in a rectangular shape to provide elastic support for the screening box 01. During vibration, the elastic support 08 undergoes periodic compression and elongation, absorbing vibration energy and reducing the vibration transmitted to the outside, while maintaining the overall stability of the screening box 01.
[0024] The specific implementation method of the above steps is described in detail below. In use, the operator first evenly feeds the fine veterinary drug powder particles to be screened into the top opening of the screening box 01, controlling the feeding amount to 70% to 80% of the effective area bearing capacity of the screen layer 04. The vibration drive assembly 02 is then activated, and the vibration motor 02 drives the connecting shaft 05 to rotate. The eccentric block 06 on the connecting shaft 05 rotates accordingly, generating periodic centrifugal force. This centrifugal force is transmitted to the entire screening box 01 through the surface contact connection between the connecting shaft 05 and the bottom of the screening box 01, causing the screening box 01 to vibrate. The vibration frequency is consistent with the motor speed at 24Hz. The fine veterinary drug powder particles begin to jump on the surface of the upper screen 12 due to the vibration. Coarse particles with a diameter greater than 180 μm cannot pass through the mesh of the upper screen 12 and are trapped on it. These coarse particles gradually move towards the edge of the screen under vibration and are discharged from the first discharge port located on the upper side wall of the screening box 01. Particles with a diameter less than 180 μm fall onto the lower screen 13 after passing through the upper screen 12. Medium-sized particles with a diameter between 125 μm and 180 μm are trapped on the lower screen 13 and move towards the edge of the screen under vibration, then are discharged from the second discharge port located in the middle of the side wall of the screening box 01. Fine particles with a diameter less than 125 μm fall onto the lower screen 13 after passing through it. On the conical guide surface 09, the material slides outwards along the conical guide surface 09 and finally exits from the third discharge port located at the bottom periphery of the screening box 01. During the screening process, the operator adjusts the vibration amplitude by adjusting the angle of the adjusting ring 07 relative to the eccentric block 06 according to the discharge speed and screening effect of the material at each discharge port. When fine powder particles are found to be discharged too quickly or dust is flying, the positioning pin fixed in the adjusting hole 15 is loosened, the adjusting ring 07 is rotated clockwise by a certain angle, and then the positioning pin is reinserted to fix it. At this time, the effective eccentricity of the eccentric block 06 decreases, and the vibration amplitude decreases. Conversely, when coarse particles move on the upper screen 12, the vibration amplitude decreases. When the vibration is slow, rotate the adjusting ring 07 counterclockwise to increase the effective eccentricity and increase the vibration amplitude. The entire adjustment process can be completed during operation without stopping the machine. The elastic support 08 periodically compresses and elongates during vibration, providing necessary support and absorbing vibration impact, preventing vibration from being transmitted to the equipment base and the ground. After screening is completed, turn off the vibration motor 02. After the screening box 01 has completely stopped vibrating, clean the residual particles on each layer of screen. Regularly check the integrity and cleanliness of the screen, check whether the fit clearance between the eccentric block 06 and the adjusting ring 07 is normal, and check whether the elasticity of the elastic support 08 has decayed. Replace it if necessary.
[0025] Specifically, the principle of this utility model is as follows: The technical solution of this utility model can solve the technical problem of the inability to adjust the amplitude. The fundamental reason is that it adopts a line contact cooperation mechanism between the eccentric block and the adjusting ring. The working principle of this mechanism is to adjust the vibration amplitude by changing the effective radius of the eccentric block. When the connecting shaft drives the eccentric block to rotate, the eccentric block generates a periodic centrifugal force due to the eccentricity between its geometric center and the axis of the connecting shaft. The magnitude of this centrifugal force is related to the mass and rotation radius of the eccentric block. The adjusting ring is sleeved on the outer circumference of the eccentric block and is in line contact with its outer circumferential surface. When the adjusting ring deflects at an angle relative to the eccentric block, the effective radius of the eccentric block changes due to the gap formed by the depth difference between the arc-shaped boss and the arc-shaped groove. This causes the component of the centrifugal force vector in the direction perpendicular to the screen plane to change, ultimately resulting in a corresponding change in the vibration amplitude of the screening box. The advantage of this adjustment mechanism lies in its continuity and precision. Unlike traditional eccentric block replacement methods that can only achieve a few fixed amplitude switching levels, the angle adjustment of the adjustment ring can achieve continuous amplitude variation within a certain range. Operators can fine-tune the adjustment based on the actual screening effect to find the optimal vibration parameters. At the same time, since the adjustment ring and eccentric block are in line contact rather than point contact, the contact stress distribution is more uniform, reducing wear and heat generation and ensuring long-term stability. The conical guide surface design at the bottom of the screening box conforms to the principle of particle flow dynamics. Under vibration, the screened particles move along the conical surface to the periphery. The inclination angle of 30 to 60 degrees ensures sufficient gravity component to promote particle sliding while avoiding excessively steep slopes that would cause particles to slide down quickly and fail to be fully screened. The gradient aperture design of the upper and lower screens allows the particles to undergo two screenings: the first retains coarse particles, and the second separates medium-sized particles, ultimately obtaining products with three different particle size ranges. The spacer support column maintains a reasonable distance between the two screens, preventing collisions and interference between the screens during vibration and ensuring the continuity and efficiency of screening. This invention solves the technical problem of low screening efficiency caused by the inability to adjust the vibration amplitude during the screening of fine veterinary drug powder particles according to different particle size distributions. This is achieved by setting an eccentric block on the connecting shaft and configuring an adjustable ring with an adjustable position. The line contact between the inner circumferential surface of the adjusting ring and the outer circumferential surface of the eccentric block, as well as the adjustable gap formed by the depth difference between the arc-shaped boss and the arc-shaped groove, allows for continuous and precise adjustment of the vibration amplitude. At the same time, the surface contact connection between the vibration drive component and the bottom of the screening box ensures uniform transmission of vibration energy. The conical guide surface design at the bottom of the screening box promotes smooth discharge of the screened particles. The gradient aperture of the upper and lower screens enables two-stage grading screening. The abutment structure of the elastic support provides support and absorbs vibration impact.
[0026] The following is a specific embodiment 1 of this utility model. Based on the specific implementation method, the eccentricity of the eccentric block 06 is adjusted from 15mm to 20mm. Correspondingly, the depth of the arc-shaped groove 11 on the inner circumferential surface of the adjusting ring 07 is increased to 6mm, while the height of the boss remains unchanged at 3mm. The fitting clearance is increased to 3mm. This adjustment expands the range of vibration amplitude adjustment, making it suitable for processing veterinary drug powder materials with a wider particle size distribution. Simultaneously, the number of adjusting holes 15 on the outer circumferential surface of the adjusting ring 07 is increased to... Eight, with the central angle between adjacent adjustment holes 15 reduced to 45 degrees, providing more precise amplitude adjustment. In addition, the screen layer 04 is increased to a three-layer structure, with a middle screen added between the original upper screen 12 and lower screen 13. The mesh size of the middle screen is 100 mesh, which is about 150μm in diameter, to achieve three-level grading and obtain products with four different particle size ranges. The spacing between each screen layer is 120mm, and the number of spacer support columns 14 is increased to 6 to ensure the stability of the multi-layer screen structure.
[0027] The following is a specific embodiment 2 of this utility model. Based on the specific implementation method, this embodiment optimizes the design of the conical guide surface 09, changing the single conical surface into a stepped conical surface structure. The stepped conical surface consists of three conical surfaces with different inclination angles. The uppermost conical surface has an inclination angle of 30 degrees, the middle conical surface has an inclination angle of 45 degrees, and the lowermost conical surface has an inclination angle of 60 degrees. The stepped structure allows particles of different sizes to slide at different stages with different sliding velocities. Coarse particles slide out quickly on the steeper lower conical surface, while fine particles slide out on the gentler upper conical surface. Slow movement and sufficient time for particles to pass through the screen improve grading accuracy. A 5mm thick polyurethane rubber buffer layer with a Shore A hardness of 70 is attached to the inner surface of the side wall of the screening box 01. This buffer layer absorbs the impact energy generated by particles colliding with the box wall, reducing particle breakage and dust generation, and extending the screen's service life. Furthermore, the stiffness coefficient of the elastic support 08 is reduced to 6N / mm, and its free length is increased to 220mm, making the support system more flexible and further reducing vibration and noise transmitted to the outside, thus improving the production environment.
[0028] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.
Claims
1. A vibrating device for grading and sieving fine veterinary drug powder particles with adjustable amplitude, characterized in that, The device includes a screening box, a vibration drive assembly, and an amplitude adjustment mechanism. A screen layer is disposed inside the screening box. The vibration drive assembly is connected to the bottom surface of the screening box via a connecting shaft. The amplitude adjustment mechanism includes an eccentric block and an adjusting ring. The eccentric block is mounted on the connecting shaft, and the adjusting ring is sleeved on the outer circumferential surface of the eccentric block and in line contact with the outer circumferential surface of the eccentric block. An adjustable gap is formed between the inner circumferential surface of the adjusting ring and the outer circumferential surface of the eccentric block. The sidewall of the screening box abuts against the outer shell of the vibration drive assembly via an elastic support.
2. The amplitude-adjustable vibration device for classifying and sieving fine veterinary drug powder particles according to claim 1, characterized in that, An arc-shaped boss is provided on the outer circumferential surface of the eccentric block, and the arc-shaped boss extends along the circumferential direction of the eccentric block.
3. The amplitude-adjustable vibration device for classifying and sieving fine veterinary drug powder particles according to claim 2, characterized in that, The inner circumferential surface of the adjusting ring is provided with an arc-shaped groove that matches the arc-shaped boss, and the depth of the arc-shaped groove is greater than the height of the arc-shaped boss.
4. The amplitude-adjustable vibration device for classifying and sieving fine veterinary drug powder particles according to claim 3, characterized in that, The bottom of the screening box is provided with a conical guide surface, the apex of which faces downwards from the screen layer, and the inclination angle of the conical guide surface is 30 to 60 degrees.
5. The amplitude-adjustable vibration device for classifying and sieving fine veterinary drug powder particles according to claim 4, characterized in that, The axial length of the connecting shaft is greater than the thickness of the bottom of the screening box, and the connecting shaft passes through the central hole at the bottom of the screening box.
6. The amplitude-adjustable vibration device for classifying and sieving fine veterinary drug powder particles according to claim 5, characterized in that, The elastic support is in the shape of a helical spring. The upper end of the elastic support is fixedly connected to the outer surface of the side wall of the screening box, and the lower end of the elastic support is fixedly connected to the bottom of the housing of the vibration drive assembly.
7. The amplitude-adjustable vibrating device for classifying and sieving fine veterinary drug powder particles according to claim 6, characterized in that, The screen layer includes an upper screen and a lower screen. The mesh size of the upper screen is larger than that of the lower screen. A spacer support column is provided between the upper screen and the lower screen.
8. The amplitude-adjustable vibrating device for classifying and sieving fine veterinary drug powder particles according to claim 7, characterized in that, The screening box is made of stainless steel, and the side wall thickness of the screening box is 2mm to 5mm.
9. The amplitude-adjustable vibrating device for classifying and sieving fine veterinary drug powder particles according to claim 8, characterized in that, The eccentric block has a disk-shaped structure, and the geometric center of the eccentric block is offset from the axis of the connecting shaft to form an eccentricity.
10. The amplitude-adjustable vibrating device for classifying and sieving fine veterinary drug powder particles according to claim 9, characterized in that, The outer circumference of the adjusting ring is provided with a plurality of evenly distributed adjusting holes, which penetrate along the axial direction of the adjusting ring, and the number of adjusting holes is 4 to 8.