A dust-proof rotary vibrating screen for grain screening

Abstract

This invention provides a dust-proof vibrating screen for grain screening, belonging to the field of vibrating screen technology. It includes a screen frame and multiple sets of supporting swing arms fixed to the screen frame. A vibrating screen is mounted at the bottom of the supporting swing arms, and a vibrating mechanism is located at the bottom of the vibrating screen. The vibrating mechanism includes a motor frame and an eccentric wheel frame, both fixedly mounted at the bottom of the vibrating screen. This invention applies upward and downward tension to the rotating shaft of the eccentric pulley simultaneously through a clamping mechanism, thereby precisely limiting the axial movement of the eccentric pulley and significantly reducing vertical displacement during high-frequency rotational excitation. This improves the contact stability between the pulley and the transmission belt, maintains a constant output of the vibrating screen's excitation force, and simultaneously counteracts the radial off-center load generated by the vibration of the rotating shaft, reducing the combined load loss of the bearings. This significantly reduces the degree of wear between the belt and the pulley groove, and the occurrence of serious malfunctions such as bearing overheating, belt slippage, and even breakage of the eccentric wheel casting.

Description

Technical Field

[0001] This invention relates to the field of vibrating screen technology, and in particular to a dust-proof vibrating screen for grain screening. Background Technology

[0002] The vibrating screen is a core piece of equipment in the grain processing industry for material grading and impurity removal. Its working principle is to drive the eccentric pulley to rotate at high speed by a motor, and use the centrifugal excitation force generated by the eccentric mass to drive the screen body to swing back and forth, so that the grain material can be screened on the screen surface. In the existing technology, the eccentric pulley of the vibrating screen is usually directly mounted on the rotating shaft and connected to the motor output shaft through a belt.

[0003] In a one-piece cast eccentric pulley vibration mechanism, the eccentric pulley experiences bidirectional axial pressure during high-frequency rotation due to the impact of the excitation force. This results in bidirectional resistance at the connection between the eccentric pulley and the wheel seat. Over prolonged rotation, this continuous bidirectional axial resistance repeatedly impacts the contact surfaces between the eccentric pulley and the wheel seat, causing the clearance between them to gradually widen. Simultaneously, this bidirectional resistance, combined with the residual casting stress of the eccentric pulley itself, creates a stress concentration zone at the connection edge between the hub and the wheel seat. Over time, microcracks within the casting will propagate, further disrupting the concentricity of the eccentric pulley's rotation and exacerbating its vertical movement. This not only significantly reduces the stability of the excitation force output but also intensifies the uneven wear between the belt and the pulley groove, ultimately leading to serious malfunctions such as bearing overheating, belt detachment, or even eccentric pulley casting breakage.

[0004] Therefore, this application provides a dust-proof vibrating screen for grain screening to meet the requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a dust-proof vibrating screen for grain screening to solve the problem that the existing eccentric wheel, due to the continuous impact of the continuous bidirectional axial resistance on the contact end face between the eccentric wheel and the wheel seat, will cause the fitting gap between the eccentric wheel and the wheel seat to gradually widen. At the same time, the bidirectional resistance will be superimposed with the casting residual stress of the eccentric wheel itself, forming a stress concentration area at the connection edge between the wheel hub and the wheel seat.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A dust-proof vibrating screen for grain screening includes a screen frame and multiple sets of support swing arms fixed on the screen frame. A vibrating screen is provided at the bottom of the multiple sets of support swing arms. A vibrating mechanism is provided at the bottom of the vibrating screen. The vibrating mechanism includes a motor frame and an eccentric wheel frame, both fixedly installed at the bottom of the vibrating screen. A belt frame is fixedly connected between the motor frame and the eccentric wheel frame. An eccentric pulley is rotatably connected inside the eccentric wheel frame. The motor output end inside the motor frame has a pulley. The belt on the pulley passes through the belt frame and is sleeved with the eccentric pulley inside the eccentric wheel frame. The outer wall of the motor frame is provided with a clamping mechanism, which includes a drive component for applying an upward pulling force to the eccentric pulley rotating shaft, a tensioning component for applying a downward pulling force to the eccentric pulley rotating shaft at the bottom of the eccentric pulley frame, and a linkage component inside the eccentric pulley frame, which is used to synchronously control the tensioning component to apply a downward pulling force to the eccentric pulley rotating shaft after the drive component applies an upward pulling force to the eccentric pulley rotating shaft.

[0007] Optionally, the drive component includes an electric push cylinder fixedly connected to the bottom of the motor frame. The output end of the electric push cylinder is ball-connected to a kit. A push rod is rotatably connected to the top of the kit. The push rod slides through the belt frame. A push-pull connecting rod is fixedly connected to the top of the push rod. A rotating pressure plate is rotatably connected to the end of the push-pull connecting rod away from the push rod. The center of the rotating pressure plate is rotatably connected to the rotating shaft of the eccentric pulley. Side plates are fixedly connected to the inner walls of both sides of the eccentric pulley frame. A protrusion is provided at the bottom of the rotating pressure plate.

[0008] Optionally, the two side plates are symmetrically arranged around the eccentric pulley. The linkage component includes a sliding frame slidably connected to the outer wall of the side plate. An extension rod is fixedly connected to the outer wall of the sliding frame. A return spring is fixedly connected between the inner wall of the sliding frame on the same side as the extension rod and the outer wall of the side plate. An L-shaped frame is fixedly connected to the outer wall of the extension rod. The L-shaped frame is slidably connected to the bottom of the eccentric wheel frame. A retaining bracket is fixedly connected to the end of the L-shaped frame away from the extension rod. A limit groove is opened on the same side of the retaining bracket and the L-shaped frame. An inclined surface is provided at the connection between the retaining bracket and the L-shaped frame. It is used in conjunction with the tensioning component.

[0009] Optionally, the tensioning component includes a rotating part rotatably connected to the bottom of the eccentric pulley, two slide rods fixedly connected to the bottom of the eccentric wheel frame, a sliding plate slidably connected to the outer wall of the two slide rods, a tensioning spring assembly fixedly connected between the sliding plate and the rotating part, a limit plate fixedly connected to the bottom of the two slide rods, the sliding plate abutting against the inclined surface of the L-shaped frame, and the sliding plate engaging with the limit groove on the card holder.

[0010] Optionally, the bottom of the vibrating screen is provided with a resistance mechanism that provides controllable damping force for the vibration motion of the vibrating screen. The resistance mechanism includes a connecting component and a deceleration component. When the vibrating mechanism needs to reduce the force of the vibrating screen vibration, the vibration amplitude of the vibrating screen is attenuated in time by the cooperation of the deceleration component and the connecting component.

[0011] Optionally, the connecting component includes an extension frame fixedly connected to the bottom of the vibrating screen, with a plug rod fixedly connected to the bottom of the extension frame, the plug rod being located at the center of the bottom of the vibrating screen, and the plug rod cooperating with the deceleration component.

[0012] Optionally, the deceleration component includes multiple fixed frames fixed to the bottom of the screen frame, with a ring fixedly connected between the multiple fixed frames. Multiple sliding block blocks are fixedly connected to the outer wall of the ring, and a sliding rod is slidably connected to the outer wall of each sliding block. The sliding rod slides through the sliding block. A spherical block is fixedly connected to one end of each sliding rod located inside the ring, and a resistance spring is fixedly connected between the end of each sliding rod away from the spherical block and each sliding block. A sleeve is fitted on the outer wall of the insertion rod, and an annular groove is opened on the outer wall of the sleeve. The spherical blocks on the multiple sliding rods are movably connected to the annular groove.

[0013] Optionally, the kit has a clamping mechanism at the bottom for applying an upward clamping force to the mounting bracket.

[0014] Optionally, the clamping mechanism includes a tripod fixedly connected to the bottom of the kit, an extension rod fixedly connected to the bottom of the push rod, the extension rod rotating through the tripod, a clamping fork fixedly connected to the bottom of the tripod, a protrusion on the top of the clamping fork, and the clamping fork abutting against the bottom of the kit. A movable hole is opened through the top of a fixed frame located at the bottom of the kit, and the connection between the tripod and the clamping fork is located inside the movable hole.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, the clamping mechanism simultaneously applies upward and downward pulling forces to the rotating shaft of the eccentric pulley, thereby precisely limiting the axial movement of the eccentric pulley and significantly reducing the vertical displacement phenomenon during high-frequency rotational excitation. This improves the fit stability between the pulley and the transmission belt, maintains a constant output of the excitation force of the vibrating screen, and at the same time counteracts the radial off-center load generated by the vibration of the rotating shaft, reduces the composite load loss of the bearing, and significantly reduces the degree of wear between the belt and the pulley groove, as well as the occurrence of serious faults such as bearing overheating, belt detachment, or even breakage of the eccentric pulley casting.

[0016] When the equipment stops, the clamping mechanism can simultaneously release the bidirectional tension on the rotating shaft of the eccentric pulley. At this time, the rotating shaft and bearing of the eccentric pulley will lose the forced preload generated by the upward and downward tension, which can release the additional stress and casting residual stress accumulated in the eccentric pulley during rotation. This avoids the long-term concentration of stress in weak parts such as the hub and bearing end face, preventing damage such as micro-cracks and plastic deformation in these parts, and further extending the service life of the eccentric pulley and bearing. At the same time, releasing the preload can also eliminate the static load of the limiting mechanism, preventing the clamping mechanism from loosening, deforming or fatigue failure due to long-term stress, ensuring the structural stability of the clamping mechanism and improving its service life.

[0017] The resistance mechanism provides controllable damping force to the vibrating screen. When the vibration amplitude decreases, the sleeve can quickly attenuate the vibration amplitude of the insert rod through the stretching force of the resistance spring via the sliding rod. This effectively suppresses the risk of resonance between the vibrating screen and the vibration force applied by the eccentric wheel when the eccentric pulley slows down. This significantly reduces the fatigue cracking of the support arm due to alternating impact loads and the hard collision between the screen body and the screen frame. At the same time, it avoids the additional vertical swaying load generated by the reverse impact force of the screen body on the eccentric pulley, reducing the risk of belt slippage, bearing overheating, and stress concentration cracking in the wheel casting. This improves the operational stability of the vibrating screen during speed adjustment and start-up / stop, further maintaining the accuracy and efficiency of material screening.

[0018] When the kit is moved by the electric pusher cylinder, the clamping mechanism is operated simultaneously, forcing the sleeve frame to press tightly against the spherical blocks on multiple sliding rods through the annular groove. This significantly increases the friction on the contact surface between the two, further enhancing the damping and deceleration effect of the clamping mechanism on the vibrating screen and accelerating the attenuation of vibration amplitude. Especially during the start-up, shutdown, and speed adjustment phases of the vibrating screen, it can more effectively suppress inertial vibration and resonance risks, further improving the controllability of the screen body's vibration movement. The moderate increase in friction can also help stabilize the center positioning of the sleeve frame and reduce its offset and swaying within the ring. In conjunction with the resistance mechanism and the eccentric pulley clamping mechanism, it greatly improves the operational stability, screening accuracy, and service life of the core components of the vibrating screen. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the vibrating screen of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the present invention; Figure 4 This is a schematic diagram of the rotating vibration mechanism of the present invention; Figure 5 This is a schematic diagram showing the cooperation between the rotary vibration mechanism and the clamping mechanism of the present invention; Figure 6 This is a partial cross-sectional view of the rotary vibration mechanism of the present invention; Figure 7 This is a schematic diagram of the clamping state of the clamping mechanism of the present invention; Figure 8This is a schematic diagram of the clamping mechanism of the present invention; Figure 9 This is a schematic diagram of the side plate structure of the present invention; Figure 10 This is a schematic diagram of the resistance mechanism structure of the present invention; Figure 11 This is a schematic diagram of the clamping mechanism of the present invention; Figure 12 for Figure 6 Enlarged view of point A in the middle.

[0021] Figure Labels

[0022] 1. Screen frame; 2. Vibrating screen; 201. Support arm; 3. Vibrating mechanism; 301. Motor frame; 302. Belt frame; 303. Eccentric pulley frame; 304. Eccentric pulley; 4. Pressing mechanism; 401. Electric pusher cylinder; 402. Kit; 403. Push rod; 404. Push-pull linkage; 405. Side plate; 406. Sliding frame; 407. Extension rod; 408. Return spring; 409. L-shaped frame; 410. Clamping bracket; 411. Rotating mechanism Components; 412. Tensioning spring assembly; 413. Limiting plate; 414. Sliding plate; 415. Sliding rod; 416. Rotating pressure plate; 5. Resistance mechanism; 501. Extension frame; 502. Insert rod; 503. Sleeve frame; 504. Fixing frame; 505. Ring; 506. Sliding hole block; 507. Sliding rod; 508. Resistance spring; 6. Clamping mechanism; 601. Triangular frame; 602. Extension rotating rod; 603. Clamping fork frame; 604. Movable hole. Detailed Implementation

[0023] The dust-proof vibrating screen for grain screening provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies.

[0024] Generally, terms can be understood at least in part from their use in context. For example, depending at least in part on the context, the term “one or more” as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense.

[0025] It is understood that the meaning of “on” in this invention should be interpreted in the broadest sense, such that “on” means not only “directly on” something, but also includes something with an intervening feature or layer.

[0026] Example 1, such as Figures 1 to 12As shown, an embodiment of the present invention provides a dust-proof vibrating screen for grain screening, including a screen frame 1 and multiple sets of support swing arms 201 fixed on the screen frame 1. A vibrating screen 2 is provided at the bottom of the multiple sets of support swing arms 201, and a vibrating mechanism 3 is provided at the bottom of the vibrating screen 2. The vibrating mechanism 3 includes a motor frame 301 and an eccentric wheel frame 303, both fixedly installed at the bottom of the vibrating screen 2. A belt frame 302 is fixedly connected between the motor frame 301 and the eccentric wheel frame 303. The eccentric wheel frame 303 internally rotates... The motor is connected to an eccentric pulley 304. The motor output end inside the motor frame 301 has a pulley. The belt on the pulley is rotated and sleeved with the eccentric pulley 304 inside the eccentric pulley frame 303 via the belt inside the belt frame 302. The motor inside the motor frame 301 drives the eccentric pulley 304 inside the eccentric pulley frame 303 to rotate via the belt inside the belt frame 302. The eccentric pulley 304 generates a vibration force during rotation, which drives the vibrating screen 2 to vibrate inside the screen frame 1 via the support swing arm 201. like Figures 1 to 9 As shown, a clamping mechanism 4 is provided on the outer wall of the motor frame 301. The clamping mechanism 4 includes a drive component for applying upward tension to the rotating shaft of the eccentric pulley 304. The drive component includes an electric push cylinder 401 fixedly connected to the bottom of the motor frame 301. A kit 402 is ball-connected to the output end of the electric push cylinder 401. A push rod 403 is rotatably connected to the top of the kit 402. The push rod 403 slides through the belt frame 302. A push-pull connecting rod 404 is fixedly connected to the top of the push rod 403. The end of the push-pull connecting rod 404 away from the push rod 403 is rotatably connected to a... A rotating pressure plate 416 is rotatably connected to the rotating shaft of the eccentric pulley 304 at its center. Side plates 405 are fixedly connected to the inner walls of both sides of the eccentric pulley frame 303. A protrusion is provided at the bottom of the rotating pressure plate 416. The electric push cylinder 401 pushes the kit 402 and the push rod 403 to slide through the belt frame 302. The push-pull connecting rod 404 drives the rotating pressure plate 416 to rotate 90°. The rotating pressure plate 416 presses the side plates 405 with the protrusion at the bottom, thereby applying an upward pulling force to the rotating shaft of the eccentric pulley 304. like Figures 1 to 8As shown, the eccentric wheel frame 303 has a linkage component inside, which is used to synchronously control the tensioning component to apply a downward pulling force to the eccentric pulley 304's rotating shaft after the driving component applies an upward pulling force to the shaft. The two side plates 405 are symmetrically arranged with the eccentric pulley 304 as the center. The linkage component includes a sliding frame 406 slidably connected to the outer wall of the side plate 405. An extension rod 407 is fixedly connected to the outer wall of the sliding frame 406. A return spring 408 is fixedly connected between the inner wall of the sliding frame 406 on the same side as the extension rod 407 and the outer wall of the side plate 405. Pushing the sliding frame 406 through the internal sliding rod and passing through the limiting block on the sliding frame 406 moves the sliding frame 406 and stretches the return spring 408, so that the sliding frame 406 can follow the rotation. The rotating pressure plate 416 is reset. An L-shaped frame 409 is fixedly connected to the outer wall of the extension rod 407. The L-shaped frame 409 is slidably connected to the bottom of the eccentric wheel frame 303. A card holder 410 is fixedly connected to the end of the L-shaped frame 409 away from the extension rod 407. A limit groove is opened on the same side of the card holder 410 and the L-shaped frame 409. An inclined surface is provided at the connection between the card holder 410 and the L-shaped frame 409. It is used in conjunction with the tensioning component. After the rotating pressure plate 416 moves to the top of the side plate 405, as the rotating pressure plate 416 continues to rotate, it will abut against the outer wall of the sliding frame 406 and push the sliding frame 406 to move through the limit block on the sliding frame 406 via the internal sliding rod. The card holder 410 is moved synchronously through the extension rod 407 and the L-shaped frame 409. like Figures 1 to 8 and Figure 12 As shown, the bottom of the eccentric wheel frame 303 is provided with a tensioning component for applying downward tension to the rotating shaft of the eccentric pulley 304. The tensioning component includes a rotating member 411 rotatably connected to the bottom of the eccentric pulley 304. Two sliding rods 415 are fixedly connected to the bottom of the eccentric wheel frame 303. Sliding plates 414 are slidably connected to the outer walls of the two sliding rods 415. A tensioning spring assembly 412 is fixedly connected between the sliding plates 414 and the rotating member 411. Limiting plates 413 are fixedly connected to the bottom of the two sliding rods 415. The sliding plates 414 abut against the inclined surface of the L-shaped frame 409, and the sliding plates 414 are engaged with the limiting groove on the clamping bracket 410. The inclined surface at the connection point with the L-shaped frame 409 allows the sliding plate 414 to slide on the outer wall of the two sliding rods 415 when the clamp 410 moves. The sliding plate 414 will enter the limiting groove on the clamp 410. When the sliding plate 414 rises, it pulls the tension spring assembly 412. Combined with the rotational connection between the rotating part 411 and the eccentric pulley 304, a downward force is applied to the rotational shaft of the eccentric pulley 304. In this way, both upward and downward forces can be applied to the rotational shaft of the eccentric pulley 304, thereby precisely limiting the axial movement of the eccentric pulley 304 and greatly reducing the phenomenon of vertical displacement during high-frequency rotational excitation.

[0027] Working principle: The electric push cylinder 401 pushes the kit 402 and push rod 403 to slide through the belt frame 302. The push-pull connecting rod 404 drives the rotating pressure plate 416 to rotate 90°. The rotating pressure plate 416 presses the side plate 405 with the convex piece at the bottom, thereby applying upward tension to the rotating shaft of the eccentric pulley 304. After the rotating pressure plate 416 moves to the top of the side plate 405, as the rotating pressure plate 416 continues to rotate, it will abut against the outer wall of the sliding frame 406, and push the sliding frame 406 to move through the limiting block on the sliding frame 406 via the internal sliding rod. The extension rod 407 and L-shaped frame 409 drive the clamping frame 410 to move synchronously. The inclined surface at the connection between the clamping frame 410 and the L-shaped frame 409 cooperates. When the bracket 410 moves, the sliding plate 414 is pushed to slide on the outer wall of the two slide rods 415, and the sliding plate 414 will enter the limiting groove on the bracket 410. When the sliding plate 414 rises, it pulls the tension spring assembly 412. Combined with the rotational connection between the rotating part 411 and the eccentric pulley 304, a downward force is applied to the rotating shaft of the eccentric pulley 304. In this way, both upward and downward forces can be applied to the rotating shaft of the eccentric pulley 304, thereby accurately limiting the axial movement of the eccentric pulley 304, greatly reducing the phenomenon of vertical displacement during high-frequency rotational excitation, maintaining a constant output of the excitation force of the vibrating screen, and at the same time offsetting the radial off-center load generated by the vibration of the rotating shaft, reducing the composite load loss of the bearing.

[0028] When the machine stops, the electric push cylinder 401 drives the rotating pressure plate 416 to disengage from the surface of the side plate 405. The reset spring 408 simultaneously pulls the sliding frame 406 to reset, thereby driving the clamp 410 to return to its position. This releases the tension on the sliding plate 414 and the tension spring assembly 412, achieving the synchronous release of the bidirectional tension on the rotating shaft of the eccentric pulley 304. At this time, the rotating shaft and bearing of the eccentric pulley 304 will lose the forced preload generated by the upward and downward tension, which can release the additional stress and casting residual stress accumulated by the eccentric pulley 304 during rotation. This avoids the long-term concentration of stress in weak parts such as the hub and bearing end face. At the same time, releasing the preload can also eliminate the static load of the limiting mechanism, preventing the pressing mechanism 4 from loosening, deforming, or fatigue failure due to long-term stress.

[0029] Example 2, as Figures 1 to 4 , Figure 10 and Figure 11As shown, the bottom of the rotary vibrating screen 2 is provided with a resistance mechanism 5 that provides controllable damping force for the vibration motion of the rotary vibrating screen 2. The resistance mechanism 5 includes a connecting component and a deceleration component. When the rotary vibrating mechanism 3 needs to reduce the vibration force of the rotary vibrating screen 2, the vibration amplitude of the rotary vibrating screen 2 is attenuated in time by the cooperation of the deceleration component and the connecting component. The connecting component includes an extension frame 501 fixedly connected to the bottom of the rotary vibrating screen 2. A plug rod 502 is fixedly connected to the bottom of the extension frame 501. The plug rod 502 is located at the center of the bottom of the rotary vibrating screen 2. The plug rod 502 is used in conjunction with the deceleration component to synchronously transmit the excitation force of the rotary vibrating screen 2 to the deceleration component. like Figure 10 and Figure 11 As shown, the deceleration component includes multiple fixed frames 504 fixed to the bottom of the screen frame 1. A ring 505 is fixedly connected between the multiple fixed frames 504. Multiple sliding block 506 is fixedly connected to the outer wall of the ring 505. A sliding rod 507 is slidably connected to the outer wall of each sliding block 506, and the sliding rod 507 slides through the sliding block 506. A spherical block is fixedly connected to one end of each sliding rod 507 located inside the ring 505. A resistance spring 508 is fixedly connected between the end of each sliding rod 507 away from the spherical block and each sliding block 506. A sleeve 503 is fitted onto the outer wall of the insert rod 502. An annular groove is formed on the outer wall of the sleeve 503. The spherical blocks on the multiple sliding rods 507 are movably connected to the annular groove. During the vibration of the vibrating screen 2, the extension frame 501 and the insert rod 502... To ensure synchronized vibration amplitude, multiple sliding rods 507, through end spherical blocks, press the sleeve 503 against the center of the ring 505. Insert rods 502 are then inserted into the sleeve 503. During operation, the vibrating screen 2, via the insert rods 502, drives the sleeve 503 to vibrate synchronously within the ring 505. The sleeve 503, based on its own vibration amplitude, pushes the corresponding sliding rods 507 outward along the sliding hole block 506 and stretches the resistance spring 508, providing controllable damping force for the vibration motion of the vibrating screen 2. When the vibration amplitude decreases, the sleeve 503, through the stretching force of the sliding rods 507 on the resistance spring 508, can quickly attenuate the vibration amplitude of the insert rods 502, effectively suppressing the risk of resonance when the eccentric pulley 304 slows down, where the vibrating screen 2's inertial vibration frequency is the same as the vibration force applied by the eccentric pulley. like Figures 1 to 8 , Figure 10 and Figure 11As shown, the bottom of the kit 402 is provided with a clamping mechanism 6. The clamping mechanism 6 is used to apply an upward clamping force to the fixed frame 504. The clamping mechanism 6 includes a tripod 601 fixedly connected to the bottom of the kit 402, an extension rotating rod 602 fixedly connected to the bottom of the push rod 403, the extension rotating rod 602 rotatably passing through the tripod 601, a clamping fork 603 fixedly connected to the bottom of the tripod 601, a protrusion provided on the top of the clamping fork 603, and the clamping fork 603 abutting against the bottom of the sleeve 503. A movable hole 604 is provided through the top of a fixed frame 504 located at the bottom of the kit 402. Through the movable hole 604, when the vibrating screen 2 vibrates, the connecting part of the tripod 601 and the clamping fork 603 can move inside the movable hole 604. The electric push cylinder 401 pushes the kit. When 402 moves, the fixed connection between the tripod 601 and the kit 402, and the rotation of the extension rod 602 through the connection between the top and bottom of the tripod 601, drive the clamping fork 603 to move synchronously. The clamping fork 603 can be moved to the bottom of the sleeve 503, so that the top of the clamping fork 603 abuts against the bottom of the sleeve 503. The protrusion on the top of the clamping fork 603 applies an upward clamping force to the sleeve 503, forcing the sleeve 503 to tightly press against the spherical blocks on the multiple sliding rods 507 through the annular groove. This significantly increases the friction on the contact surface between the two, which can further enhance the damping and deceleration effect of the clamping mechanism 6 on the vibrating screen 2 and accelerate the attenuation of the vibration amplitude. Especially during the start-up, stop and speed adjustment stages of the vibrating screen 2, it can more effectively suppress the risk of inertial vibration and resonance.

[0030] Working principle: During the vibration of the rotary vibrating screen 2, the extension frame 501 and the insert rod 502 vibrate at the same frequency. Multiple sliding rods 507, through the spherical blocks at their ends, press the sleeve 503 against the center of the ring 505. The insert rods 502 are inserted inside the sleeve 503. During operation, the rotary vibrating screen 2 drives the sleeve 503 to vibrate synchronously inside the ring 505 through the insert rods 502. According to its own vibration amplitude, the sleeve 503 pushes the corresponding sliding rod 507 to slide outward along the sliding hole block 506 and stretches the resistance spring 508, thus generating the vibration motion of the rotary vibrating screen 2. It provides controllable damping force. When the vibration amplitude decreases, the sleeve 503 can quickly attenuate the vibration amplitude of the insert rod 502 by the tension force of the resistance spring 508 through the sliding rod 507. This effectively suppresses the risk of resonance between the inertial vibration frequency of the rotary vibrating screen 2 and the vibration force applied by the eccentric wheel when the eccentric pulley 304 decelerates. This significantly reduces the phenomenon of fatigue cracking of the support swing arm 201 due to alternating impact load and hard collision between the screen body and the screen frame 1. At the same time, it can avoid the additional up-and-down swaying load generated by the reverse impact force of the screen body on the eccentric pulley 304. When the electric pusher cylinder 401 moves the kit 402, the fixed connection between the tripod 601 and the kit 402, and the rotation of the extension rod 602 through the connection between the top and bottom of the tripod 601, drive the clamping fork 603 to move synchronously. The clamping fork 603 can be moved to the bottom of the sleeve 503, so that the top of the clamping fork 603 abuts against the bottom of the sleeve 503. The protrusion on the top of the clamping fork 603 applies an upward clamping force to the sleeve 503, forcing the sleeve 503 to tightly press against the spherical blocks on the multiple sliding rods 507 through the annular groove, significantly increasing the pressure on both. The friction on the contact surface can further enhance the damping and deceleration effect of the clamping mechanism 6 on the vibrating screen 2, accelerate the attenuation of vibration amplitude, especially during the start-up, shutdown and speed adjustment stages of the vibrating screen 2, it can more effectively suppress inertial vibration and resonance risks, further improve the controllability of the screen body vibration movement, and the moderate increase in friction can help stabilize the center positioning of the sleeve 503, reduce its offset and swaying within the ring 505, and cooperate with the resistance mechanism 5, the eccentric pulley 304, and the clamping mechanism 4 to greatly improve the operating stability, screening accuracy and service life of the core components of the vibrating screen 2.

[0031] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dust-proof vibrating screen for grain screening, comprising a screen frame (1) and multiple sets of support swing arms (201) fixed on the screen frame (1), a vibrating screen (2) is provided at the bottom of the multiple sets of support swing arms (201), a vibrating mechanism (3) is provided at the bottom of the vibrating screen (2), the vibrating mechanism (3) includes a motor frame (301) and an eccentric wheel frame (303) fixed at the bottom of the vibrating screen (2), a belt frame (302) is provided between the motor frame (301) and the eccentric wheel frame (303), and an eccentric pulley (304) is provided inside the eccentric wheel frame (303), characterized in that: The outer wall of the motor frame (301) is provided with a clamping mechanism (4). The clamping mechanism (4) includes a drive component for applying an upward pulling force to the rotating shaft of the eccentric pulley (304). The bottom of the eccentric wheel frame (303) is provided with a tensioning component for applying a downward pulling force to the rotating shaft of the eccentric pulley (304). The eccentric wheel frame (303) is provided with a linkage component inside, which is used to synchronously control the tensioning component to apply a downward pulling force to the rotating shaft of the eccentric pulley (304) after the drive component applies an upward pulling force to the rotating shaft of the eccentric pulley (304).

2. The dust free rotary vibration screen for grain screening according to claim 1, characterized in that, The drive component includes an electric push cylinder (401) fixedly connected to the bottom of the motor frame (301). The output end of the electric push cylinder (401) is ball-connected to a kit (402). A push rod (403) is rotatably connected to the top of the kit (402). The push rod (403) slides through the belt frame (302). A push-pull connecting rod (404) is fixedly connected to the top of the push rod (403). A rotating pressure plate (416) is rotatably connected to the end of the push-pull connecting rod (404) away from the push rod (403). The center of the rotating pressure plate (416) is rotatably connected to the rotating shaft of the eccentric pulley (304). Side plates (405) are fixedly connected to the inner walls on both sides of the eccentric pulley frame (303). A protrusion is provided at the bottom of the rotating pressure plate (416).

3. The dust-proof vibrating screen for grain screening according to claim 2, characterized in that, Two side plates (405) are symmetrically arranged with an eccentric pulley (304) as the center. The linkage component includes a sliding frame (406) that is slidably connected to the outer wall of the side plate (405). An extension rod (407) is fixedly connected to the outer wall of the sliding frame (406). A return spring (408) is fixedly connected between the inner wall of the sliding frame (406) on the same side as the extension rod (407) and the outer wall of the side plate (405). An L-shaped frame (409) is fixedly connected to the outer wall of the extension rod (407). The L-shaped frame (409) is slidably connected to the bottom of the eccentric wheel frame (303). A clamp (410) is fixedly connected to the end of the L-shaped frame (409) away from the extension rod (407). A limit groove is opened on the same side of the clamp (410) and the L-shaped frame (409). An inclined surface is provided at the connection between the clamp (410) and the L-shaped frame (409). It is used in conjunction with the tensioning component.

4. The dust-proof vibrating screen for grain screening according to claim 3, characterized in that, The tensioning component includes a rotating part (411) rotatably connected to the bottom of the eccentric pulley (304), two slide rods (415) fixedly connected to the bottom of the eccentric wheel frame (303), a sliding plate (414) slidably connected to the outer wall of the two slide rods (415), a tensioning spring assembly (412) fixedly connected between the sliding plate (414) and the rotating part (411), a limiting plate (413) fixedly connected to the bottom of the two slide rods (415), the sliding plate (414) abuts against the inclined surface of the L-shaped frame (409), and the sliding plate (414) fits into the limiting groove on the card holder (410).

5. The dust-proof vibrating screen for grain screening according to any one of claims 2-4, characterized in that, The bottom of the rotary vibrating screen (2) is provided with a resistance mechanism (5) that provides controllable damping force for the vibration of the rotary vibrating screen (2). The resistance mechanism (5) includes a connecting component and a deceleration component. When the rotary vibrating mechanism (3) needs to reduce the vibration force of the rotary vibrating screen (2), the vibration amplitude of the rotary vibrating screen (2) is attenuated in time by the cooperation of the deceleration component and the connecting component.

6. The dust free rotary vibration screen for grain screening according to claim 5, characterized in that, The connecting component includes an extension frame (501) fixedly connected to the bottom of the vibrating screen (2). A plug rod (502) is fixedly connected to the bottom of the extension frame (501), and the plug rod (502) is located at the center of the bottom of the vibrating screen (2). The plug rod (502) is used in conjunction with the deceleration component.

7. The dust free rotary vibration screen for grain screening according to claim 6, characterized in that, The deceleration component includes multiple fixed frames (504) fixed to the bottom of the screen frame (1), a ring (505) fixedly connected between the multiple fixed frames (504), multiple sliding hole blocks (506) fixedly connected to the outer wall of the ring (505), a sliding rod (507) slidably connected to the outer wall of each sliding hole block (506), and the sliding rod (507) slidably passes through the sliding hole block (506). A spherical block is fixedly connected to one end of the multiple sliding rods (507) located inside the ring (505), and a resistance spring (508) is fixedly connected between the end of each sliding rod (507) away from the spherical block and each sliding hole block (506). A sleeve (503) is sleeved on the outer wall of the insert rod (502), and an annular groove is opened on the outer wall of the sleeve (503). The spherical blocks on the multiple sliding rods (507) are movably connected to the annular groove.

8. The dust free rotary vibration screen for grain screening according to claim 7, characterized in that, The kit (402) has a clamping mechanism (6) at the bottom, which is used to apply an upward clamping force to the fixing frame (504).

9. The dust free rotary vibration screen for grain screening according to claim 8, characterized in that, The clamping mechanism (6) includes a tripod (601) fixedly connected to the bottom of the kit (402), an extension rod (602) fixedly connected to the bottom of the push rod (403), the extension rod (602) rotating through the tripod (601), a clamping fork (603) fixedly connected to the bottom of the tripod (601), a protrusion provided on the top of the clamping fork (603), and the clamping fork (603) abutting against the bottom of the sleeve (503). A fixed bracket (504) located at the bottom of the kit (402) has a movable hole (604) through its top, and the connection between the tripod (601) and the clamping fork (603) is located inside the movable hole (604).

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