Sand and gravel screening device for cement production

Abstract

The present invention relates to the field of sand and gravel screening technology, and specifically discloses a sand and gravel screening device for cement production, including: a base, a vibrating screen body and a filter screen, the vibrating screen body is movably installed on the base, the filter screen is tilted, a guide plate is movably installed in the vibrating screen body, the guide plate is arranged above the filter screen, and the two are arranged at intervals, and the gap between the two is for materials smaller than the gap to pass through, and a discharge port is provided on the vibrating screen body, and the guide plate is tilted and its tilted lower side faces the discharge port, so that large-size materials can move along the guide plate and be discharged from the discharge port. The present invention performs relative motion between the vibrating screen body and the guide plate, so that the sliding plate slides back and forth, thereby driving the toggle plate to swing back and forth, and the toggle plate continuously toggle the large-size materials, and the rotation of the large-size materials not only accelerates the discharge from the discharge port, but also drives the rotation of the surrounding small-size materials, accelerates the downward movement of the small-size materials, and can effectively improve the screening efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sand and gravel screening, in particular to a sand and gravel screening device for cement production. Background Art

[0002] Sand and gravel refers to a loose mixture of sand and gravel, which is formed by the breaking and splitting of rocks in nature through various surface actions such as weathering and erosion. Sand and gravel have good hardness, stable chemical properties and are easy to obtain. Sand and gravel are often used as high-quality construction materials and concrete raw materials in the fields of houses, roads, railways, bridges and engineering. Because the structure of sand and gravel mined at the beginning varies greatly, the uniformity of particle size cannot be guaranteed, so sand and gravel must be screened before they can be used in different fields.

[0003] A Chinese patent with publication number CN116550598B discloses a quartz sand screening device, including a base, a frame and a vibrating screen body, the screen plate includes a middle screening zone and side screening zones distributed on both sides of the middle screening zone, and a pair of roller brushes are arranged on the upper surface of the screen plate, and the roller brushes are used to move part of the quartz sand on the middle screening zone with a diameter larger than the diameter of the sieve hole of the sieve plate to the side screening zones. By partitioning the sieve plate, the roller brushes move part of the quartz sand on the middle screening zone with a diameter larger than the diameter of the sieve hole of the sieve plate to the side screening zones on both sides, thereby increasing the probability of quartz sand with a diameter smaller than the diameter of the sieve hole of the sieve plate being screened to the next layer, thereby improving the screening efficiency.

[0004] In the above patent document, the larger sand and gravel particles are pushed to both sides by the continuous swing of the roller brush, but the larger sand and gravel particles in this solution still exist on the screen. Since it is impossible to clean all the larger sand and gravel particles to both sides, there will be a small amount of residue in the middle part, and more large sand and gravel particles will accumulate on both sides. The presence of large sand and gravel particles will still affect the screening and falling of small sand and gravel particles, and it is impossible to fundamentally solve the influence of larger sand and gravel particles on the screening efficiency of small sand and gravel particles. Summary of the invention

[0005] The present invention provides a sand and gravel screening device for cement production, aiming to solve the problem in the related technology that larger sand and gravel particles still exist on the screen. Since it is impossible to clean all the larger sand and gravel particles to both sides, a small amount of residue will be left in the middle part, and more large sand and gravel particles will be accumulated on both sides. The presence of large sand and gravel particles will still affect the screening and falling of small sand and gravel particles, and it is impossible to fundamentally solve the technical problem that larger sand and gravel particles affect the screening efficiency of small sand and gravel particles.

[0006] The sand and gravel screening device for cement production of the present invention comprises: a base, a vibrating screen body and a filter screen, the vibrating screen body is movably installed on the base, the filter screen is inclined, a guide plate is movably installed in the vibrating screen body, the guide plate is arranged above the filter screen, and the two are arranged at an interval, and the gap between the two is for materials smaller than the gap to pass through, a discharge port is provided on the vibrating screen body, the guide plate is inclined and its inclined lower side faces the discharge port, so that large-particle-size materials can move along the guide plate and be discharged from the discharge port, the guide plate is fixedly connected to the base, a sliding plate is slidably installed on the guide plate, the sliding plate can slide back and forth in the length direction of the guide plate, a plurality of toggle plates are rotatably installed on the side of the sliding plate facing the high part of the filter screen, each toggle plate is connected to the sliding plate through a linkage assembly, so that when the sliding plate slides back and forth, the toggle plate can be driven to swing back and forth around the sliding plate, and the large-particle-size materials can be toggled to rotate and move toward the discharge port.

[0007] Beneficial effect: Add sand and gravel materials into the vibrating screen body from the right side, the vibrating screen body vibrates continuously on the base, the finer materials fall below after passing through the filter screen, and the qualified materials pass through the gap between the guide plate and the filter screen and are discharged from the drop-out port below. The large-sized sand and gravel are blocked at the guide plate. When the vibrating screen body vibrates, the guide plate remains stationary, and the top block will continuously squeeze the sliding plate, causing the sliding plate to slide back and forth, thereby driving the toggle plate to continuously swing back and forth through the swing mechanism. The toggle plate will continuously toggle the large-sized materials during the swinging process. The large-sized materials will rotate and can not only move along the toggle plate to the lowest discharge port of the guide plate to avoid blocking the small-sized materials, but also the rotation of the large-sized materials will drive the surrounding small-sized materials to rotate, accelerating the downward movement of the small-sized materials, which can effectively improve the screening efficiency and re-crush the screened large-sized materials for screening.

[0008] Preferably, a spring is provided at one end of the sliding plate and an arc-shaped inclined surface is provided at the other end, and a top block is fixedly installed on the side wall of the vibrating screen body, and the top block contacts the inclined surface so that when the vibrating screen body vibrates up and down, the sliding plate can reciprocate along the length direction of the guide plate.

[0009] The effect is that the relative movement between the vibrating screen body and the guide plate can cause the top block to continuously push the sliding plate, and the reciprocating movement of the sliding plate can be achieved in cooperation with the spring.

[0010] Preferably, the linkage assembly includes movable grooves formed on the upper and lower end surfaces of the toggle plate, in which pulling columns are movably installed, and a transmission rod is fixedly installed on the pulling column, and one end of the transmission rod away from the pulling column is rotatably connected to the guide plate.

[0011] The effect is that when the sliding plate reciprocates along the guide plate, the linkage component can be used to drive the paddle plate to continuously swing back and forth, thereby paddle the large-size material.

[0012] Preferably, a rotating plate is rotatably installed at the discharge port, and the rotating plate is frictionally matched with the side wall of the discharge port. A one-way bearing is rotatably installed on the rotating plate, and a force storage component is fixed on the one-way bearing. The other end of the force storage component is connected to the rotating plate. A spiral rod is provided on the guide plate, and the lower end of the spiral rod is inserted into the one-way bearing, and the spiral rod and the one-way bearing can move relative to each other, forcing the inner ring of the one-way bearing to rotate. A one-way limiting structure is provided on the outer wall of the one-way bearing, which can make the outer ring of the one-way bearing rotate unidirectionally, thereby storing force in the force storage component. The release of the force storage component can drive the rotating plate to rotate and open, thereby discharging large particle size materials.

[0013] The effect is that the rotation of the rotating plate can not only push the large-size materials to be discharged quickly from the discharge port, but also beat the materials, so as to shake off the small-size materials adhering to the large-size materials.

[0014] Preferably, the one-way limiting structure comprises a limiting ring slidably mounted on the outer wall of the one-way bearing, the bottom wall of the limiting ring is provided with a protrusion, both surfaces of the protrusion rotating in the forward and reverse directions are inclined surfaces, and the rotating plate is provided with a slot on the path of the protrusion movement.

[0015] Preferably, the force storage component is a torsion spring.

[0016] Preferably, two sliding plates are spaced apart on the guide plate.

[0017] Preferably, a rubber layer is provided on the shifting piece.

[0018] The effect is that it can increase the friction of the paddle, so that the large-particle material can be better rotated, and at the same time it will drive the small-particle material to pass through, thereby improving the screening effect.

[0019] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: large-size sand and gravel will be blocked at the guide plate, and when the vibrating screen body vibrates, the guide plate remains stationary, and the sliding plate will be continuously squeezed by the top block, so that the sliding plate slides back and forth, thereby driving the toggle plate to continuously swing back and forth through the swing mechanism. The toggle plate will continuously toggle the large-size material during the swinging process. The large-size material will rotate and can not only move along the toggle plate to the lowest discharge port of the guide plate to avoid blocking the small-size material, but also the rotation of the large-size material will drive the surrounding small-size material to rotate, accelerate the downward movement of the small-size material, and effectively improve the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a first structural schematic diagram of the present invention.

[0021] Figure 2 It is a cross-sectional view of the present invention.

[0022] Figure 3This is a second structural schematic diagram of the present invention.

[0023] Figure 4 It is a schematic structural diagram of the guide plate of the present invention.

[0024] Figure 5 It is a schematic diagram of the decomposition of the guide plate and the sliding plate of the present invention.

[0025] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle.

[0026] Figure 7 It is a schematic diagram of the rotating plate of the present invention.

[0027] Figure 8 It is an exploded schematic diagram of the rotating plate and the one-way bearing of the present invention.

[0028] Fig. 9 It is a cross-sectional view of the rotating plate of the present invention.

[0029] Reference numerals:

[0030] 10. Base; 11. Vibrating screen body; 12. Filter; 13. Column; 20. Guide plate; 21. Sliding plate; 22. Paddle plate; 23. Movable groove; 24. Transmission rod; 25. Pull column; 26. Top block; 27. Sliding groove; 30. Rotating plate; 31. Plug plate; 32. One-way bearing; 33. Drive plate; 34. Torsion spring; 35. Limiting ring; 36. Bump; 37. Slot; 38. Mounting plate; 39. Screw rod. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] like Figures 1 to 9 As shown, a specific embodiment of the sand and gravel screening device for cement production of the present invention includes a base 10, a vibrating screen body 11, a filter screen 12, a guide plate 20, a sliding plate 21, a top block 26, a swing mechanism and a toggle plate 22.

[0033] The vibrating screen body 11 is installed on the base 10 , and the vibrating screen body 11 and the filter screen 12 are both inclined.

[0034] The guide plate 20 is located in the vibrating screen body 11 and has a gap with the filter screen 12 , so that sand and gravel materials with smaller particle sizes can pass through the gap, and unqualified sand and gravel with larger particle sizes are blocked by the guide plate 20 .

[0035] The guide plate 20 is inclined along the width direction of the vibrating screen body 11, so that large-size sand and gravel can roll downward along the guide plate 20 and finally be discharged from the discharge port. The guide plate 20 is fixedly connected to the column 13 on the base 10. When the vibrating screen body 11 vibrates, the guide plate 20 remains stationary, so that the vibrating screen body 11 and the guide plate 20 can move relative to each other up and down.

[0036] A sliding plate 21 is slidably installed on the side of the guide plate 20 facing the added material, and a plurality of paddle pieces 22 are rotatably installed on the sliding plate 21. The top block 26 is fixedly installed on the vibrating screen body 11. When the vibrating screen body 11 and the guide plate 20 move relative to each other, the sliding plate 21 is driven to slide back and forth by the top block 26. During the reciprocating sliding of the sliding plate 21, the paddle piece 22 is driven to swing back and forth continuously through the swing mechanism, so as to paddle the large-grained sand and gravel blocked at the guide plate 20, so that it moves downward along the guide plate 20.

[0037] A discharge port is provided on the vibrating screen body 11 at the lowest point of the guide plate 20, and the large-size sand and gravel can finally be discharged from the discharge port.

[0038] During operation, sand and gravel materials are added into the vibrating screen body 11 from the right side, and the vibrating screen body 11 continuously vibrates on the base 10. Finer materials fall below after passing through the filter screen 12. Qualified materials pass through the gap between the guide plate 20 and the filter screen 12 and are discharged from the drop-out port below. Large-sized sand and gravel are blocked at the guide plate 20. When the vibrating screen body 11 vibrates, the guide plate 20 remains stationary, and the top block 26 continuously squeezes the sliding plate 21, causing the sliding plate 21 to slide back and forth, thereby driving the toggle plate 22 to continuously swing back and forth through the swing mechanism. The toggle plate 22 continuously toggles the large-sized materials during the swinging process. The large-sized materials rotate and can not only move along the toggle plate 22 to the discharge port at the lowest point of the guide plate 20 to avoid blocking the small-sized materials, but also the rotation of the large-sized materials will drive the surrounding small-sized materials to rotate, accelerate the downward movement of the small-sized materials, and effectively improve the screening efficiency. The sieved large-sized materials are crushed again for screening.

[0039] It should be noted that, in the present invention, the vibrating screen body 11 only performs up and down reciprocating vibration.

[0040] like Figure 1 and Figure 2 In this embodiment, two filter screens 12 are arranged inside the vibration screen body 11, thereby dividing the vibration screen body 11 into three screening chambers. A material drop port is arranged on the left side of each screening chamber, so that materials with three particle sizes can be screened out. The above contents are all prior arts and will not be described in detail.

[0041] In this embodiment, guide plates 20 are installed in both the first screening chamber and the second screening chamber of the vibrating screen body 11 .

[0042] Continue back Figure 1 and Figure 3 In this embodiment, the guide plate 20 is inclined along the width direction of the vibrating screen body 11, that is, the front and rear ends of the guide plate 20 form an angle with the front and rear side walls of the vibrating screen body 11 respectively, and the angle is greater than or less than 90 degrees, and the front and rear ends of the guide plate 20 are slidably matched with the front and rear side walls of the vibrating screen body 11. Since the filter screen 12 is inclined, the contact point between the guide plate 20 and the rear side wall of the vibrating screen body 11 is higher than the contact point between the front side wall, so that large-grained sand and gravel can roll down the guide plate 20 to the discharge port on the front side.

[0043] A connecting column is fixedly installed on the rear side of the guide plate 20. The connecting column passes through the groove on the rear side wall of the vibrating screen body 11 and is fixedly connected to the column 13 on the base 10. The groove on the rear side wall of the vibrating screen body 11 is rectangular, thereby ensuring that during the vibration of the vibrating screen body 11, there is enough space for the connecting column to ensure that the guide plate 20 remains stationary, so that relative up and down movement can occur between the vibrating screen body 11 and the guide plate 20.

[0044] like Figure 4 and Figure 5 In this embodiment, a sliding groove 27 is provided on the side of the guide plate 20 facing the added material along the length direction of the guide plate 20, and a sliding plate 21 is slidably installed in the sliding groove 27. The sliding plate 21 can slide along the length direction of the guide plate 20, and the rear end of the sliding plate 21 is set as an arc-shaped inclined surface, and a top block 26 is fixedly installed on the side wall of the vibrating screen body 11 on this side, and the top block 26 is in contact with the inclined surface. When the vibrating screen body 11 and the guide plate 20 move up and down relative to each other, the top block 26 pushes the inclined surface to cause the sliding plate 21 to slide, and a spring is installed at the other end of the sliding plate 21, so that the sliding plate 21 can continuously reciprocate when the vibrating screen body 11 vibrates.

[0045] In this embodiment, two sliding plates 21 are arranged at intervals in the upper and lower parts, which can better push and discharge the large-grained sand and gravel. In other embodiments, more sliding plates 21 can also be arranged.

[0046] The toggle piece 22 is rotatably installed on the front side of the sliding plate 21, and there are multiple toggle pieces 22 evenly distributed along the length direction of the sliding plate 21. The swing mechanism includes movable grooves 23 opened on the upper and lower end surfaces of the toggle piece 22, and pulling columns 25 are movably installed in the movable grooves 23. A transmission rod 24 is fixedly installed on the pulling column 25. The upper and lower transmission rods 24 are rotatably connected to the inner wall of the sliding groove 27 at one end away from the pulling column 25. To ensure that the transmission rod 24 has sufficient moving space when the sliding plate 21 moves, grooves for the transmission rod 24 to move are opened on the top wall and the bottom wall of the sliding groove 27.

[0047] It is particularly noted that in this embodiment, the guide plate 20 is inclined in the vertical direction, that is, the guide plate 20 and the filter screen 12 are not perpendicular, but have a certain angle, and the guide plate 20 is inclined toward the side where the material is added (such as Figure 2 ), with this arrangement, the paddle plate 22 can better paddle large-grained gravel.

[0048] In addition, a rubber layer is provided on the paddle plate 22, so that the friction between the paddle plate 22 and the large-particle material can be increased, and the material can be better paddled.

[0049] During operation, large-size sand and gravel accumulate on the right side of the guide plate 20, and material particles smaller than the filter screen 12 fall from the filter screen 12. Qualified materials can pass through the gap between the guide plate 20 and the filter screen 12 and continue to roll down and be discharged. When the vibrating screen body 11 vibrates, it will cause relative up and down movement with the guide plate 20, and at the same time, the guide plate 20 can also continuously squeeze the materials passing through the gap, disperse the materials adhering together, and ensure the screening effect. During the continuous up and down movement of the top block 26 on the vibrating screen body 11, the inclined surface of the sliding plate 21 is continuously squeezed, and the reciprocating movement of the sliding plate 21 is realized in cooperation with the spring at one end of the sliding plate 21. When the sliding plate 21 moves, it drives the toggle plate 22 to move. As the toggle plate 22 moves, the transmission rod 24 is rotated around the end close to the sliding groove 27 through the pulling column 25;

[0050] When the toggle plate 22 moves, the pulling column 25 moves in the movable groove 23, and is restricted by the transmission rod 24, which forces the toggle plate 22 to turn. Therefore, when the sliding plate 21 reciprocates, the toggle plate 22 is continuously turned through the connecting rod structure, thereby achieving the swinging effect of the toggle plate 22. It should be emphasized that the specific structure of the connecting rod belongs to the prior art, and the specific working principle will not be described in detail.

[0051] The large-size sand and gravel materials will be continuously rolled down along the guide plate 20 until they are discharged from the discharge port, and the large-size sand and gravel materials will be re-crushed and filtered again. It should be emphasized that in this embodiment, the front end of the guide plate 20 is relatively low in position, and the end is slidably matched with the front side wall of the vibrating screen body 11, and a discharge port is provided at a position of the front side wall of the vibrating screen body 11 near the front end of the guide plate 20, and the discharge port is at a certain height between the filter screens 12, thereby forming a step, so that qualified small particles cannot be discharged from the discharge port during the vibration process, and the large-size sand and gravel materials can just cross the step and fall from the discharge port during the vibration process.

[0052] When the large-sized sand and gravel reach the side of the guide plate 20, because there is a step between the discharge port and the filter screen 12, the large-sized sand and gravel pass through the discharge port at a slow speed, and may accumulate, which will affect the screening effect of the material. Therefore, the present invention also provides a second embodiment, which is as follows.

[0053] like Figure 7 , Figure 8 and Fig. 9 A rotating plate 30 is rotatably mounted at the discharge port on the front side of the vibrating screen body 11, and a pin is fixedly mounted at the middle position of the discharge port. The pin passes through the center of the rotating plate 30, so that the rotating plate 30 can rotate around the pin.

[0054] In this embodiment, the rotating plate 30 is an equilateral trapezoidal structure, so that the inclined surface at the discharge port can match the inclined guide plate 20, which facilitates the discharge of large-diameter sand and gravel.

[0055] Plug plates 31 are movably mounted on the two inclined surfaces of the rotating plate 30. Grooves are provided on both sides of the rotating plate 30. The plug plates 31 are movably mounted in the grooves. Springs are also provided in the grooves, and the contact surfaces of the plug plates 31 are arc-shaped surfaces. When the rotating plate 30 is in a closed state, the plug plates 31 on both sides contact the two side surfaces of the discharge port. The springs push the plug plates 31, and friction is formed between the arc surfaces of the plug plates 31 and the two side walls of the discharge port, thereby enabling the rotating plate 30 to close the discharge port.

[0056] A one-way bearing 32 is rotatably mounted on the rotating plate 30. A torsion spring 34 is fixed on the outer peripheral wall of the one-way bearing 32 located inside the rotating plate 30. One end of the torsion spring 34 is connected to the outer peripheral wall of the one-way bearing 32, and the other end is connected to the rotating plate 30. A driving plate 33 is fixedly mounted on the upper end of the inner ring of the one-way bearing 32. A driving hole is opened at the center of the driving plate 33. An L-shaped mounting plate 38 is fixedly mounted on the guide plate 20. A spiral rod 39 is horizontally slidably mounted on the mounting plate 38, and the lower end of the spiral rod 39 is inserted into the driving hole. The driving hole cooperates with the spiral surface of the spiral rod 39. When the vibrating screen body 11 and the guide plate 20 are in contact with each other, the vibration screen body 11 and the guide plate 20 are in contact with each other. When the flow plates 20 move up and down relative to each other, the screw rod 39 and the one-way bearing 32 also move relative to each other, so that the screw rod 39 can drive the inner ring of the one-way bearing 32 to rotate through the driving plate 33. As the screw rod 39 continues to rise and fall, the inner ring of the one-way bearing 32 will rotate back and forth. The outer wall of the one-way bearing 32 is also provided with a one-way structure, so that during the process of the inner ring of the one-way bearing 32 rotating back and forth, the outer ring of the one-way bearing 32 can continuously rotate in one direction, so that the one-way bearing 32 can drive the torsion spring 34 to rotate, and continuously store force on it.

[0057] The one-way structure includes a limit ring 35 slidably mounted on the outer peripheral wall of the one-way bearing 32, and a slide groove and a slider structure are provided between the limit ring 35 and the outer peripheral wall of the one-way bearing 32. The slide groove is arranged along the axial direction of the one-way bearing 32, so that the limit ring 35 can slide axially up and down along the outer wall of the one-way bearing 32. The bottom wall of the limit ring 35 is provided with a protrusion 36, and the two surfaces of the protrusion 36 for forward and reverse rotation are both inclined surfaces, and the rotating plate 30 is provided with a slot 37 on the movement path of the protrusion 36.

[0058] When the screw rod 39 drives the one-way bearing 32 to rotate, the inner ring of the one-way bearing 32 rotates counterclockwise, and its outer ring is also driven to rotate counterclockwise synchronously. The outer ring drives the torsion spring 34 to rotate and store force. At the same time, the outer ring drives the limit ring 35 to rotate counterclockwise. After the inclined surface of the protrusion 36 at the bottom of the limit ring 35 conflicts with the groove 37, the limit ring 35 is forced to rise along the outer wall of the one-way bearing 32 through the slide groove. After rotating one circle, the protrusion 36 re-enters the groove 37. When the inner ring of the one-way bearing 32 rotates clockwise, it is restricted by the protrusion 36 and the groove 37, and the outer ring of the one-way bearing 32 cannot rotate clockwise, thereby continuously storing force for the torsion spring 34 to rotate.

[0059] It should be particularly noted that the counterclockwise rotation of the one-way bearing 32 requires that the counterclockwise direction of the protrusion 36 is an inclined surface. When the torsion spring 34 is released, that is, when the rotating plate 30 rotates counterclockwise to open, at this time, the rotating plate 30 and the one-way bearing 32 will rotate relative to each other, and the other opposite side of the protrusion 36 must also be an inclined surface. Therefore, when the rotating plate 30 rotates counterclockwise to open, the one-way bearing 32 will drive the clockwise inclined surface on the protrusion 36, forcing the limit ring 35 to rise, thereby realizing the counterclockwise rotation of the rotating plate 30.

[0060] It should be emphasized that the direction in which the one-way bearing 32 rotates when storing force for the torsion spring 34 is the same as the direction in which the rotating plate 30 rotates when the torsion spring 34 releases force.

[0061] Moreover, the slope of the inclined surface of the protrusion 36 in the counterclockwise direction is greater than the slope of the inclined surface in the clockwise direction. When the one-way bearing 32 rotates, it needs to overcome a larger force to make the limit ring 35 rise, and at the same time store force for the torsion spring 34. The force on the inclined surface of the protrusion 36 in the counterclockwise direction is mainly to overcome the release of the force of the torsion spring 34, thereby preventing the rotating plate 30 from opening.

[0062] When the accumulated force of the torsion spring 34 reaches the maximum value, the force of the torsion spring 34 will drive the rotating plate 30 to rotate. Since the slope of the inclined surface of the protrusion 36 in the counterclockwise direction is small, it is easier to overcome.

[0063] When the large-size sand and gravel vibrate, they hit the rotating plate 30, giving it an outward force, and the force of the torsion spring 34 starts to release. The force of the torsion spring 34 overcomes the friction between the plug plate 31 and the inner wall of the discharge port, achieving release and driving the rotating plate 30 to rotate clockwise, thereby achieving a repeated cycle.

[0064] When the rotating plate 30 turns over, it will hit the large stones near the discharge port to promote the discharge of large sand and gravel. If it is small stones that are bonded, the small stones will be dispersed due to the beating, and then screened through the filter screen 12, thereby improving the screening efficiency.

[0065] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. Sand and gravel screening device for cement production, including: Base, vibrating screen body and filter screen, the vibrating screen body is movably installed on the base, and the filter screen is tilted; The invention is characterized in that a guide plate is movably installed in the vibration screen body, the guide plate is arranged above the filter screen, and the two are arranged at intervals, and the gap between the two is for materials smaller than the gap to pass through, and a discharge port is provided on the vibration screen body, and the guide plate is inclined and its inclined lower side faces the discharge port, so that large-size materials can move along the guide plate and be discharged from the discharge port; A connecting column is fixedly installed on the rear side of the guide plate, and the connecting column passes through the groove on the rear side wall of the vibrating screen body and is fixedly connected to the column on the base. The groove on the rear side wall of the vibrating screen body is rectangular, and a sliding plate is slidably installed on the guide plate, and the sliding plate can slide back and forth in the length direction of the guide plate; A plurality of paddles are rotatably mounted on one side of the sliding plate facing the upper part of the filter screen, and each paddle is connected to the sliding plate through a linkage assembly, so that when the sliding plate slides back and forth, the paddle can be driven to swing back and forth around the sliding plate, and the large-size material can be driven to rotate and move toward the discharge port; A rotating plate is rotatably installed at the discharge port, and the rotating plate is frictionally matched with the side wall of the discharge port. A one-way bearing is rotatably installed on the rotating plate, and a force storage component is fixed on the one-way bearing. The other end of the force storage component is connected to the rotating plate. A spiral rod is provided on the guide plate, and the lower end of the spiral rod is inserted into the one-way bearing, and the spiral rod and the one-way bearing can move relative to each other, forcing the inner ring of the one-way bearing to rotate. A one-way limiting structure is provided on the outer wall of the one-way bearing, which can make the outer ring of the one-way bearing rotate in one direction, thereby storing force for the force storage component. The release of the force storage component can drive the rotating plate to rotate and open, so as to discharge the large-size material. The one-way limiting structure comprises a limiting ring slidably mounted on the outer wall of the one-way bearing, a protrusion is arranged on the bottom wall of the limiting ring, both surfaces of the protrusion rotating in the forward and reverse directions are inclined surfaces, and a slot is arranged on the rotating plate on the path of the protrusion moving; The sliding plate is provided with a spring at one end and an arc-shaped inclined surface at the other end, and a top block is fixedly installed on the side wall of the vibrating screen body, and the top block contacts the inclined surface, so that when the vibrating screen body vibrates up and down, the sliding plate can reciprocate along the length direction of the guide plate; The linkage assembly comprises a movable groove on the toggle plate, a pulling column is movably installed in the movable groove, a transmission rod is fixedly installed on the pulling column, and one end of the transmission rod away from the pulling column is rotatably connected to the guide plate.

2. The sand and gravel screening device for cement production according to claim 1, characterized in that: The force storage component is a torsion spring.

3. The sand and gravel screening device for cement production according to claim 1, characterized in that: Two sliding plates are arranged on the guide plate at intervals.

4. The sand and gravel screening device for cement production according to claim 1, characterized in that: A rubber layer is arranged on the toggle piece.

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