A vibration excitation force adjustable screening vibration source structure

Abstract

The utility model discloses a kind of screening vibration source structures of adjustable exciting force, it is related to screening equipment technical field, to solve the problem of low screening efficiency and poor material adaptability caused by the fixed exciting force of traditional vibration source, it includes vertical motor, upper and lower chuck and eccentric assembly arranged on chuck, eccentric assembly includes flail, counterweight unit and the first drive module of driving counterweight unit along the radial movement of chuck.By the distance between counterweight unit and motor center being adjusted by drive module, form the linear adjustment mechanism of "distance-excitation force", the screening requirement of different density, viscosity material can be matched in real time, improve screening efficiency and production continuity, and simple structure, low modification cost, easy to industrial application.

Description

Technical Field

[0001] This utility model belongs to the field of screening equipment technology, and in particular relates to a screening vibration source structure with adjustable excitation force. Background Technology

[0002] Screening equipment is widely used in mining, metallurgy, chemical, and building materials industries. It uses the excitation force generated by a vibration source to make the material reciprocate on the screen surface, thereby separating materials of different particle sizes. In existing technology, the vibration source of screening equipment usually consists of a vertical motor and two discs, one above the other. The discs are equipped with eccentric swing plates. When the motor drives the discs to rotate, the centrifugal force of the swing plates generates an excitation force, which drives the screen frame to vibrate.

[0003] However, the eccentricity of the traditional vibrating source's swivel plates cannot be adjusted, meaning the excitation force is solely determined by the motor speed. When dealing with materials of different densities, viscosities, or particle sizes (e.g., moist, sticky materials require a larger excitation force to avoid clogging, while lightweight materials require a smaller excitation force to prevent over-sieving), a fixed excitation force is difficult to match optimal screening requirements, resulting in low screening efficiency, poor material adaptability, and energy waste. Furthermore, adjusting the excitation force requires stopping the machine and replacing swivel plates with different counterweights, which is cumbersome and disrupts production continuity. Utility Model Content

[0004] Based on this, and to address the aforementioned technical problems, a screening vibration source structure with adjustable excitation force is provided.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A screening vibration source structure with adjustable excitation force includes a vertical motor and two upper and lower discs driven by the vertical motor. An eccentric assembly is provided on the discs. The eccentric assembly includes a swing plate. The eccentric assembly further includes a counterweight unit for providing counterweight to the swing plate and a first drive module for driving the counterweight unit to move horizontally back and forth along the radial direction of the discs. The first drive module is fixed on the swing plate.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] 1. Achieve linearly adjustable excitation force to adapt to various material screening needs: The first drive module drives the counterweight unit to move radially along the disc, and the distance (eccentricity) between the counterweight unit and the center of the motor can be adjusted to form a linear adjustment mechanism of "distance-excitation force". When the material has high density and viscosity, the eccentricity can be increased to improve the excitation force and avoid screen clogging; when the material is light and easy to screen, the eccentricity can be decreased to reduce the excitation force and prevent over-screening, significantly improving adaptability to materials with different characteristics.

[0009] 2. Improve screening efficiency and production continuity: No need to stop the machine to replace the sling plate. The excitation force can be adjusted in real time through the drive module to match the changes in material characteristics during dynamic production (such as fluctuations in material moisture content, changes in particle size distribution, etc.) to ensure that the screening efficiency is always in the optimal state, reduce downtime, and improve production continuity.

[0010] 3. Simple structure, low modification cost, and easy industrial application: Based on the existing vibration source structure, the function can be upgraded simply by adding a counterweight unit and a drive module. There is no need to make major changes to core components such as motors and discs. The modification cost is low, the compatibility is strong, and it can be directly applied to the upgrade and modification of existing screening equipment. Attached Figure Description

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0012] Figure 1 A three-dimensional structural diagram of a screening device provided in an embodiment of this utility model;

[0013] Figure 2 A cross-sectional view of a screening device provided in an embodiment of this utility model. Figure 1 ;

[0014] Figure 3 A cross-sectional view of a screening device provided in an embodiment of this utility model. Figure 2 ;

[0015] Figure 4 A schematic diagram of the internal structure of a screening device provided in an embodiment of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the lower screen in an embodiment of the present invention;

[0017] Figure 6 This is a schematic diagram of the lower mesh frame according to an embodiment of the present utility model;

[0018] Figure 7 This is a schematic diagram of the sealing structure according to an embodiment of the present invention;

[0019] Figure 8 This is a schematic diagram of the structure of the vibration source according to an embodiment of the present invention;

[0020] Figure 9 This is a schematic diagram of the structure of the flower plate according to an embodiment of the present utility model;

[0021] Figure 10 This is a side view of the flower plate according to an embodiment of the present utility model;

[0022] Figure 11This is a vertical sectional view of the flower plate according to an embodiment of the present utility model;

[0023] Figure 12 This is an exploded view of the eccentric component according to an embodiment of the present utility model;

[0024] Figure 13 This is a control principle diagram of an embodiment of the present invention. Detailed Implementation

[0025] The embodiments of this utility model will be described below with reference to the accompanying drawings. It should be noted that the embodiments described in this specification are not exhaustive and do not represent the only embodiments of this utility model. The following corresponding embodiments are only for clearly illustrating the utility model content of this patent and are not intended to limit its implementation. For those skilled in the art, different variations and modifications can be made based on the described embodiments. Any obvious variations or modifications that fall within the technical concept and utility model content of this utility model are also within the protection scope of this utility model.

[0026] like Figure 1 , Figure 2 and Figure 13 As shown, this utility model embodiment provides a screening device, including a screen frame 1100, a base 1200, a vibration source 1300, a controller 1400, a material level sensor 1500, an ultrasonic transducer 1600, and a vibration sensor 1700.

[0027] like Figure 1 As shown, the top of the screen frame 1100 is a dust cover 1110, and the center of the dust cover 1110 has a feed inlet 1111.

[0028] In this embodiment, a mesh frame is provided inside the sieve frame 1100, and a sieve mesh is provided on the mesh frame.

[0029] Among them, such as Figure 2-5 As shown, the above-mentioned mesh frame includes a lower mesh frame 1120, an upper mesh frame 1130, an outer guide hopper 1140 and an inner guide hopper 1150, and the above-mentioned screen includes a lower screen 1160 and an upper screen 1170.

[0030] like Figure 6 As shown, the lower screen frame 1120 includes a concentric outer ring 1121, a middle ring 1122 and an inner ring 1123. The outer ring 1121 is snapped and fixed to the side wall of the screen frame 1100. The middle ring 1122 is connected to the outer ring 1121 and the inner ring 1123 is connected to the middle ring 1122 by multiple spokes 1124.

[0031] like Figure 5As shown, the lower screen 1160 is disc-shaped and is fixed to the lower screen frame 1120 by adhesive. Its radial direction is divided into annular and concentric material receiving area 1161, screening area 1162 and discharge area 1163. The material receiving area 1161 corresponds vertically to the area between the outer ring 1121 and the middle ring 1122. The screening area 1162 corresponds vertically to the area between the middle ring 1122 and the inner ring 1123. Multiple screen holes are evenly distributed on it. The discharge area 1163 forms a discharge port, and the diameter of the discharge port is equal to the inner diameter of the inner ring 1123.

[0032] The network frame 1130 is ring-shaped, with its concentric ring located above the lower network frame 1160.

[0033] The upper screen 1170 is disc-shaped and is fixed to the screen frame 1130 by adhesive. It has multiple screen holes evenly distributed on it, and the screen holes have the same diameter as the screen holes of the lower screen 1160.

[0034] like Figure 2-4 As shown, the outer guide hopper 1140 is located radially outside the upper screen 1170. Its upper opening is integrally connected to the side wall of the screen frame 1100, and its lower opening is located directly above the screening area 1162. It is used to guide the material that the upper screen 1170 cannot screen in time (including the screen residue left by the upper screen 1170) to the screening area 1162.

[0035] The inner guide hopper 1150 is used to guide the material screened by the upper screen 1170 to the lower layer. Its upper opening is integrally connected with the screen frame 1130, and its lower opening forms a downward extending section 1151. The extending section 1151 passes through the discharge port of the discharge area 1163 and the inner ring 1123 and is tightly fitted with the inner ring 1123, so that the screen frame 1130 is indirectly fixed to the screen frame 1100, and the lower opening of the inner guide hopper 1150 is connected to the discharge port, thereby guiding the material screened by the upper screen 1170 to the lower layer (the bottom of the screen frame in this embodiment).

[0036] Based on the above structure, the material entering from the feed inlet 1111 is first screened by the upper screen 1170. The material that the upper screen 1170 cannot screen in time is guided to the lower screen 1160. Since the screen holes of the upper and lower screens are the same, it is equivalent to increasing the screening area (filtration area), which can accommodate more material. Compared with the existing technology, the effective filtration area is increased by more than 60%, the single processing capacity is increased, and the efficiency is improved.

[0037] like Figure 1 As shown, the side wall of the screen frame 1100 is also provided with two discharge ports 1180 that correspond one-to-one with the bottom of the screen frame and the screen frame. The discharge port 1180 corresponding to the screen frame is located between the corresponding lower screen 1160 and upper screen 1170, and the lower edge of the discharge port 1180 is flush with the upper surface of the lower screen 1160, which facilitates material discharge.

[0038] It is understandable that the screen frame 1100 is not limited to having only one layer of screen frame, but can have multiple layers of screen frame. Each layer of screen frame and the screen on it can adopt the above structure, and each layer of screen frame corresponds to a discharge port.

[0039] like Figure 2 As shown, the screen frame 1100 has a material level sensor 1500 on the side wall between the lower screen 1160 and the upper screen 1170, used to detect the material level in the material receiving area 1161. Figure 3 As shown, the corresponding discharge port 1180 is equipped with a discharge gate 1182 driven to open and close by the second drive module 1181. The material level sensor 1500 and the second drive module 1181 are connected to the controller 1400. See [link to relevant documentation]. Figure 13 The material level sensor 1500 monitors the material level (height) in the material receiving area 1161 in real time. When the material level reaches the set high alarm value, it indicates that too much material has accumulated, which may affect the screening effect. At this time, the controller 1400 controls the second drive module 1181 to open the discharge gate 1182 to discharge the accumulated material and ensure the normal screening of subsequent materials. After the discharge is completed, the material level drops back to the normal range, the discharge gate 1182 is closed, and the screening process continues normally. The entire process does not require machine shutdown, which solves the problem of screen blockage and avoids efficiency loss caused by manual cleaning.

[0040] The second drive module 1181 uses a cylinder.

[0041] To ensure that the material on the screen is vibrated and dispersed more fully, effectively preventing material from clogging the screen holes and improving screening accuracy, such as... Figure 2 As shown, the screen frame has a corresponding ultrasonic transducer 1600. The ultrasonic transducer 1600 is fixed to the outer surface of the side wall of the screen frame 1100 by a bracket. Its waveguide 1610 passes through the side wall of the screen frame and is connected to the inner ring 1123 of the corresponding lower screen frame 1120. The ultrasonic transducer 1600 only acts on the lower screen frame 1120 to avoid the upper screen 1170 being interfered with by resonance.

[0042] A sealing structure 1620 is provided between the waveguide 1610 and the side wall of the sieve frame 1100.

[0043] Specifically, such as Figure 7As shown, the sealing structure 1620 includes a screw 1621, an inner sealing gasket 1622, an outer sealing gasket 1623, an inner nut 1624, an O-ring 1625, and an outer nut 1626. The screw 1621 passes through the side wall of the screen frame 1100 and has a central hole through which the waveguide 1610 passes. The diameter of the central hole is the same as the outer diameter of the waveguide 1610. A retaining ring 1621a is formed on the screw 1621 outside the side wall. The inner sealing gasket 1622 and the outer sealing gasket 1623 are both fitted onto the screw 1621. The inner sealing gasket 1622 is located inside the side wall, and the outer sealing gasket 1623 is located between the side wall and the retaining ring 1621a. The inner nut 1624... 624 is located on the inner side wall and is threadedly connected to the screw 1621, pressing the inner sealing gasket 1622 onto the side wall. The retaining ring 1621a presses the outer sealing gasket 1623 onto the side wall. The inner sealing gasket 1622 and the outer sealing gasket 1623 prevent material from leaking out from between the screw 1621 and the side wall of the screen frame. The O-ring 1625 is located on the outer side wall and is fitted onto the waveguide 1610 and locked by the outer nut 1626 to form a tight fit with the front end face of the screw 1621. The outer nut 1626 is threadedly connected to the screw 1621. The O-ring 1625 prevents material from leaking out from between the waveguide 1610 and the central hole of the screw 1621.

[0044] The screw 1621 has a conical first groove on its front end face, the outer nut 1626 has a nut cap 1626a formed on its front side through which the waveguide 1610 passes, the nut cap 1626a has a conical second groove formed on its inner side that is opposite to the first groove, and the O-ring 1625 is sandwiched between the first groove and the second groove.

[0045] The inner gasket 1622, outer gasket 1623, and O-ring 1625 are all made of XNBR carboxylated nitrile rubber, which has strong wear resistance.

[0046] Compared with existing technologies, the sealing performance of the above-mentioned sealing structure 1620 is significantly improved. It adopts a threaded connection structure of screw, inner nut and outer nut. During disassembly, only the inner nut and outer nut need to be unscrewed to remove the sealing component without damaging the original structure, which greatly shortens the maintenance time and reduces labor costs. The inner and outer sealing gaskets are tightly pressed against the side wall of the screen frame by the pre-tightening force of the nuts. The O-ring is locked by the outer nut and is tightly attached to the front end face of the screw, which prevents the seal from loosening under vibration conditions and ensures long-term reliability.

[0047] like Figure 3 As shown, a vibration sensor 1700 is respectively installed on the side wall of the screen frame 1100 and on the dust cover 1110. These sensors are used to collect vibration data (amplitude and vibration velocity) of the screen frame 1100 in the horizontal and vertical directions, respectively, and feed this data back to the controller 1400. (See also...) Figure 13 .

[0048] like Figure 2 and Figure 3 As shown, a downwardly extending cylinder 1190 is formed on the lower side of the bottom of the screen frame 1100 for mounting the vibration source 1300.

[0049] The base 1200 is located on the lower side of the screen frame 1100, and multiple springs 1210 are provided between the two. Multiple tension springs 1191 are provided between the base 1200 and the cylinder 1190.

[0050] The vibration source 1300 is used to apply vibration force to the screen frame 1100. It includes a protective cover 1310, a vertical motor 1320, and upper and lower discs 1330. See [link / reference needed] Figure 3 and Figure 8 .

[0051] The protective cover 1310 is fixed to the lower opening of the cylinder 1190.

[0052] The vertical motor 1320 is fixed inside the cylinder 1190, which is a conventional structure and will not be described in detail here. The vertical motor 1320 is a high-speed motor (0-7500rpm steplessly adjustable).

[0053] The two flower discs 1330 are located on the upper and lower sides of the vertical motor 1320, and rotate horizontally under the drive of the output shaft of the vertical motor 1320, as shown. Figure 9 As shown, the output shaft has a bushing 1321 that passes through the center of the flower plate 1330, and the bushing 1321 has a step located above the flower plate 1330.

[0054] Among them, such as Figure 8 As shown, the upper disc 1330 is locked to the output shaft by fixing screws 1322 and fixing pressure block 1323, and the lower disc 1330 is locked to the output shaft by locking nut 1324 and fixing pressure block 1323.

[0055] Each flower plate 1330 has multiple locking holes corresponding to the scale, which is existing technology and will not be described in detail here.

[0056] Each flower plate 1330 is also equipped with an eccentric component 1340, such as Figure 9 As shown, the eccentric component 1340 includes a swing plate 1341, a counterweight unit 1342, a first drive module 1343, and a distance sensor 1344.

[0057] The swing plate 1341 is a long rectangular plate, with its rear end fitted onto the bushing 1321 and supported by a step on the bushing 1321, as shown below. Figure 9-11As shown, the lower surface of the front end of the swing plate 1341 has a support post 1341a that contacts the flower plate 1330, thereby positioning the swing plate 1341 horizontally above the flower plate 1330. Furthermore, the lower surface of the front end of the swing plate 1341 also has a locking member 1341b that engages with a locking hole in the flower plate 1330. (See Figure 1341). Figure 10 and Figure 11 This structure is existing technology and will not be described in detail here.

[0058] like Figure 12 As shown, two ears 1341c are formed on the left and right sides of the rear end of the swing plate 1341, and each ear 1341c has a fixing hole along the front and rear direction of the swing plate 1341.

[0059] The counterweight unit 1342 is used to provide counterweight for the swing plate 1341, such as Figure 12 As shown, it includes six counterweights 1342a, with three counterweights stacked on the upper and lower sides of the swing plate 1341. Each counterweight 1342a has bolt holes at its four corners. The six counterweights 1342a are connected and fixed by four bolts and nuts passing through the four corner bolt holes. Additionally, each counterweight 1342a has a C-shaped notch 1342a-1 on its rear side that fits into the bushing 1321. The counterweight 1342a adjacent to the upper side of the swing plate 1341 also has a downwardly extending detection portion 1342a-2. (See [reference]). Figure 12 .

[0060] The first drive module 1343 uses a miniature electric actuator to drive the counterweight unit 1342 to move horizontally back and forth along the radial direction of the disc 1330. The vibration force applied to the screen frame will be different depending on the radial position of the counterweight unit 1342, or in other words, the distance between it and the center of the motor (the greater the distance, the greater the vibration force). The distance sensor 1344 is used to monitor the actual distance between the counterweight unit 1342 and the center of the motor in real time and feed it back to the controller 1400. The first drive module 1343 and the distance sensor 1344 are respectively fixed to the fixing holes of the two ears 1341c by nuts. The output shaft of the first drive module 1343 is connected to one of the bolts on the six counterweights 1342a. The distance sensor 1344 is opposite to the detected part 1342a-2.

[0061] The controller 1400 determines whether the current vibration state of the screening equipment meets the screening requirements based on the data fed back by the vibration sensor 1700 (by comparing the vibration data with the preset optimal value). If it does not meet the requirements, the controller 1400 controls the first drive module 1343 to accurately adjust the distance between the counterweight unit 1342 and the center of the motor based on the data fed back by the distance sensor 1344, so as to meet the screening requirements and form a linear adjustment mechanism of "distance-excitation force". This mechanism can achieve millisecond-level response adjustment of excitation force, breaking through the limitation that the eccentricity of the traditional vibration source plate cannot be adjusted, which causes the excitation force to be determined only by the motor speed. This mechanism can adapt to different material densities and viscosity requirements.

[0062] When the material has high density and viscosity, the eccentricity can be increased to improve the excitation force and avoid screen clogging; when the material is light and easy to screen, the eccentricity can be reduced to decrease the excitation force and prevent over-screening, thus significantly improving the adaptability to materials with different properties.

[0063] Specifically, the controller 1400 adjusts the position of the counterweight unit 1342 on the lower flower plate 1330 based on the vibration data fed back by the vibration sensor 1700 on the side wall of the screen frame 1100, and adjusts the position of the counterweight unit 1342 on the upper flower plate 1330 based on the vibration data fed back by the vibration sensor 1700 on the dust cover 1110.

[0064] As can be seen from the above, the beneficial effects of the screening equipment provided by this utility model embodiment are as follows:

[0065] 1. Significantly Improved Effective Screening Area and Processing Capacity: The traditional single-layer screen frame and single-layer screen on it are improved to a lower screen frame + lower screen and a top screen frame + upper screen, with equal aperture sizes on both screens. Combined with an external guide bucket, material not screened on the upper screen is guided to the lower screen, effectively increasing the screening area (filtration area) and accommodating more material. Compared with existing technologies, the effective filtration area is increased by more than 60%, improving single-pass throughput and efficiency, meeting the needs of large-scale continuous production, and reducing the number of equipment and floor space. The external guide bucket prevents material accumulation on the upper screen, ensuring that unscreened material is guided to the screening area of ​​the lower screen, while the internal guide bucket quickly guides the material screened on the upper screen to the lower layer. The combination of these two methods results in a more uniform material distribution on the screen surface, reducing local overload, lowering the risk of screen clogging, and improving screening efficiency and stability.

[0066] 2. The controller can perform closed-loop control on the distance between the counterweight unit and the center of the motor based on the data fed back by the vibration sensor, forming a linear adjustment mechanism of "distance-excitation force". This achieves millisecond-level response adjustment of the excitation force, breaking through the limitations of traditional fixed excitation force, adapting to different material densities and viscosities. Combined with the stepless adjustment of the motor from 0-7500rpm (the motors of traditional screening equipment are usually fixed at two levels (1500 / 3000rpm)), the range of adaptable materials is increased by 300%.

[0067] 3. By using automatic material level monitoring and discharge, the problem of material accumulation is solved, ensuring the smooth operation of the screening process. This avoids the efficiency loss caused by traditional manual material cleaning and reduces downtime by 90%.

[0068] 4. Throughout the screening process, the controller continuously receives data from the sensors and adjusts the actions of each actuator in real time, enabling intelligent and automated screening operations without frequent manual intervention. This improves the efficiency and quality of screening, reduces labor costs, increases screening efficiency by 40%, and reduces energy consumption by 25%.

[0069] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A screening vibration source structure with adjustable excitation force, comprising a vertical motor and two upper and lower discs driven by the vertical motor, wherein the discs are provided with an eccentric assembly, the eccentric assembly including a swing plate, characterized in that, The eccentric assembly further includes a counterweight unit for providing counterweight to the swivel plate and a first drive module for driving the counterweight unit to move horizontally back and forth along the radial direction of the flower disc, the first drive module being fixed to the swivel plate.

2. The adjustable excitation force screening vibration source structure according to claim 1, characterized in that, The counterweight unit includes multiple counterweight blocks. The swing plate is horizontally positioned above the flower disc, and its rear end is fitted onto the bushing of the output shaft of the vertical motor. The bushing has a step to support the swing plate. The lower surface of the front end of the swing plate has a support column that contacts the flower disc. The multiple counterweight blocks are stacked on the upper and lower sides of the swing plate, and the multiple counterweight blocks are connected by multiple evenly distributed bolts and nuts. One of the bolts is connected to the first drive module.

3. The adjustable excitation force screening vibration source structure according to claim 2, characterized in that, The first drive module is connected to the controller.

4. The adjustable excitation force screening vibration source structure according to claim 3, characterized in that, It also includes a distance sensor for real-time monitoring of the actual distance between the counterweight unit and the center of the motor and feeding it back to the controller, the distance sensor being signal-connected to the controller.

5. The adjustable excitation force screening vibration source structure according to claim 4, characterized in that, Two ears are formed on the left and right sides of the rear end of the swing plate. The first drive module and the distance sensor are respectively fixed on the two ears. A counterweight block adjacent to the swing plate has a detection part opposite to the distance sensor.

6. The adjustable excitation force screening vibration source structure according to claim 1, characterized in that, The vertical motor is a steplessly adjustable motor with a speed range of 0-7500rpm.

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