A vibrating graded stone screening machine

Abstract

This utility model discloses a vibrating graded crushed stone screening machine, relating to the technical field of graded crushed stone screening machines. It includes a frame, with a screening box mounted on top of the frame. A primary screen and a secondary screen are arranged side-by-side on the inner wall of the screening box from top to bottom. Slide plates are fixedly connected to both sides of the primary and secondary screens. Adjustment grooves are symmetrically formed on the inner wall of the screening box. This utility model, through the sliding connection between the slide plates and the T-shaped adjustment grooves on the inner wall of the screening box, allows the slide plates to slide along the adjustment grooves when the screw is tightened, applying tension to both sides of the primary and secondary screens. This maintains the rigidity of the screens under vibration and crushed stone impact, weakening the impact force of the crushed stone, preventing excessive plastic deformation of the screens, and extending their service life. The linkage design between the screw and the slide plates allows for screen replacement or adjustment simply by loosening the screw and sliding the slide plates, reducing maintenance downtime and lowering equipment maintenance costs.

Description

Technical Field

[0001] This utility model relates to the technical field of graded crushing stone screening machines, specifically a vibrating graded crushing stone screening machine. Background Technology

[0002] A graded aggregate screening machine is a specialized device for classifying and screening crushed stone according to different particle sizes. It is widely used in construction, highway, railway, and water conservancy projects to ensure that the particle size distribution of the crushed stone meets engineering requirements. Its main function is to separate mixed stone into graded aggregates of different specifications through vibration or mechanical screening to meet the precise control requirements for aggregate particle size during construction.

[0003] Existing vibrating screens generally use a channel steel pressure plate type screen fixing structure, that is, the screen is directly pressed against the inner wall of the screen box by channel steel. However, this has some drawbacks in actual use: because the screen is only pressed and fixed on one side by the channel steel, during equipment operation, the screen box drives the screen to vibrate continuously. The crushed stone material passing over the screen surface constantly exerts impact loads on the screen. Since there is no tension support structure on both sides of the screen, it is prone to plastic deformation under long-term alternating stress. As working time accumulates, the deformation amplitude of the screen gradually increases, eventually leading to changes in screen aperture size, decreased screening accuracy, and in severe cases, even screen tearing and failure. This not only affects screening efficiency but also shortens the screen's service life and increases equipment maintenance costs.

[0004] To address these issues, we designed a vibrating graded stone screening machine. Utility Model Content

[0005] The purpose of this invention is to provide a vibrating gradation crushing and screening machine to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a vibrating graded crushing and screening machine, including a frame, a screening box installed on the top of the frame, and a primary screen and a secondary screen arranged side by side from top to bottom on the inner wall of the screening box;

[0007] Both sides of the primary and secondary screens are fixedly connected to sliding plates. The inner wall of the screening box is symmetrically provided with adjustment grooves, which are slidably connected to the sliding plates. Two clamping plates are fixedly connected to the same side of the sliding plate and the secondary screen, with the secondary screen located between the clamping plates. A screw is fixedly connected to one side of the sliding plate, passing through the adjustment groove and threadedly connected to the screening box. A vibration mechanism is provided on the frame.

[0008] Furthermore, the vibration mechanism includes a motor, the output shaft of which is fixedly connected to a vibration transmission shaft, the vibration transmission shaft being fixedly connected to the screening box, and an eccentric block being provided between the motor and the vibration transmission shaft.

[0009] Furthermore, the cross-sectional area of ​​the primary screen is larger than that of the secondary screen, and the primary screen is located directly above the secondary screen.

[0010] Furthermore, a reinforcing plate is fitted on the outer wall of the screw, the screw is threadedly connected to the reinforcing plate, and a positioning pin is provided through the reinforcing plate, which is inserted into the screening box.

[0011] Furthermore, the adjustment groove is T-shaped.

[0012] Furthermore, buffer springs are fixedly connected to the four corners of the top of the frame, and the top of the buffer springs is fixedly connected to the screening box.

[0013] Furthermore, both the primary and secondary screens are equipped with support frames at their bottoms, and the support frames are fixedly connected to the inner wall of the screening box.

[0014] Furthermore, the primary screen and the secondary screen are arranged at an angle.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By setting a sliding connection between the sliding plate and the T-shaped adjustment groove on the inner wall of the screening box, and cooperating with the threaded connection between the screw and the screening box, the sliding plate can be driven to slide along the adjustment groove when the screw is tightened, so as to apply stable tension to both sides of the primary and secondary screens, so that the screens maintain rigidity under vibration and gravel impact, weaken the impact force of gravel, prevent excessive plastic deformation of the screens, and extend service life.

[0017] 2. By setting two clamping plates and placing the secondary screen between the clamping plates, a three-point support structure is formed, which further enhances the stress stability of the screen and avoids excessive local stress on the screen, which may cause tearing. The linkage design of the screw and the sliding plate makes it possible to replace or adjust the screen simply by loosening the screw and sliding the sliding plate. Compared with the traditional channel steel clamping structure, the disassembly and assembly method is more convenient, reducing maintenance downtime and lowering equipment maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the screening box of this utility model;

[0020] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This utility model Figure 2 Enlarged view of point B in the middle;

[0022] Figure 5 This is a bottom view of the support frame of this utility model.

[0023] In the diagram: 1. Screening box; 2. Buffer spring; 3. Frame; 4. Eccentric block; 5. Motor; 6. Primary screen; 7. Secondary screen; 8. Vibration drive shaft; 9. Reinforcing plate; 10. Positioning pin; 11. Screw; 12. Adjustment groove; 13. Slide plate; 14. Clamping plate; 15. Support frame. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution: a vibrating graded crushed stone screening machine, including a frame 3, a screening box 1 installed on the top of the frame 3, and a primary screen 6 and a secondary screen 7 arranged side by side from top to bottom on the inner wall of the screening box 1.

[0026] Slide plates 13 are fixedly connected to both sides of the primary screen 6 and the secondary screen 7. Adjustment grooves 12 are symmetrically opened on the inner wall of the screening box 1. The adjustment grooves 12 are slidably connected to the slide plates 13. The adjustment grooves 12 are T-shaped. Two clamping plates 14 are fixedly connected to the same side of the slide plates 13 and the secondary screen 7. The secondary screen 7 is located between the clamping plates 14. A screw 11 is fixedly connected to one side of the slide plates 13. The screw 11 passes through the adjustment groove 12 and is threadedly connected to the screening box 1. The primary screen 6 and the secondary screen 7 are inclined. A vibration mechanism is provided on the frame 3. The vibration mechanism includes a motor 5. The output shaft of the motor 5 is fixedly connected to a vibration transmission shaft 8. The vibration transmission shaft 8 is fixedly connected to the screening box 1. An eccentric block 4 is provided between the motor 5 and the vibration transmission shaft 8. The eccentric block 4 is fixedly connected to the vibration transmission shaft 8 by a key.

[0027] In practice, the primary screen 6 and the secondary screen 7 are installed into the screening box 1 via the slide plate 13 along the T-shaped adjustment groove 12. The slide plate 13 is fixed in the required position by tightening the screw 11. The secondary screen 7 is fixed on the slide plate 13 by the clamping plate 14 to form a three-point support structure. The motor 5 is started to drive the vibration transmission shaft 8 and the eccentric block 4 to rotate, causing the screening box 1 to vibrate. After the crushed stone material enters the screening box 1, it moves along the inclined primary screen 6 and secondary screen 7 under the action of vibration and is classified and screened. The T-shaped fit between the slide plate 13 and the adjustment groove 12 and the tightening action of the screw 11 ensure that both sides of the screen are always under tension, which weakens the impact force of the crushed stone and prevents its deformation. When it is necessary to replace or adjust the primary screen 6 and the secondary screen 7, the screw 11 is loosened and the slide plate 13 is slid along the adjustment groove 12 for maintenance.

[0028] See Figure 2 The cross-sectional area of ​​the primary screen 6 is larger than that of the secondary screen 7. The primary screen 6 is located directly above the secondary screen 7. Larger-diameter gravel is first intercepted and separated by the primary screen 6, while smaller-diameter gravel is further screened by the secondary screen 7 after passing through the primary screen 6, thus improving screening efficiency and accuracy.

[0029] See Figure 4 A reinforcing plate 9 is fitted on the outer wall of the screw 11. The screw 11 is threadedly connected to the reinforcing plate 9. A positioning pin 10 is provided through the reinforcing plate 9. The positioning pin 10 is inserted into the screening box 1. The positioning pin 10 passes through the reinforcing plate 9 and is inserted into the screening box 1, further locking the position of the screw 11 and the slide plate 13. The primary screen 6 and the secondary screen 7 maintain a stable tension state and extend their service life.

[0030] See Figure 1 The top four corners of the frame 3 are fixedly connected with buffer springs 2. The top of the buffer springs 2 is fixedly connected to the screening box 1, which can buffer the impact force generated when the screening box 1 vibrates, reduce the wear and tear on the frame 3 and the overall structure of the equipment, and reduce the operating noise.

[0031] See Figure 3 and Figure 5 Both the primary screen 6 and the secondary screen 7 are equipped with support frames 15 at the bottom. The support frames 15 are fixedly connected to the inner wall of the screening box 1 to provide bottom support for the primary screen 6 and the secondary screen 7, reducing excessive deformation due to the weight and impact of crushed stone.

[0032] Working principle:

[0033] During use, the screw 11 passing through the adjustment groove 12 is rotated. As the screw 11 rotates, it drives the slide plate 13 to slide along the T-shaped adjustment groove 12. When the slide plate 13 moves, it drives the clamping plates 14 on both sides to move synchronously. The primary screen 6 and the secondary screen 7 gradually tighten with the slide plate 13 until the surface is flat and without looseness, and can withstand tension during vibration. After tension adjustment is completed, the motor 5 on the frame 3 is started. The output shaft of the motor 5 drives the vibration transmission shaft 8 to rotate. When the vibration transmission shaft 8 rotates, the eccentric block 4 located between the motor 5 and the vibration transmission shaft 8 rotates with the shaft, generating centrifugal force. This centrifugal force is transmitted to the screening box 1 through the vibration transmission shaft 8, causing the screening box 1 to rotate at the top of the frame 3. Vibration occurs, and during the vibration, the primary screen 6 and the secondary screen 7 vibrate with the screening box 1. After the graded crushed stone to be screened is put into the screening box 1, it slides down along the inclined primary screen 6 under the action of vibration. The impact force generated by the collision between the crushed stone and the screen is offset by the tension on both sides of the screen, preventing the screen from being deformed by force. The crushed stone with a particle size smaller than the screen hole of the primary screen 6 falls into the secondary screen 7, and the remaining crushed stone is discharged along the primary screen 6. The crushed stone that falls into the secondary screen 7 continues to slide under the action of vibration. Similarly, under the action of tension, the secondary screen 7 is not easily deformed by the impact force of the crushed stone. The crushed stone with a particle size smaller than the screen hole of the secondary screen 7 passes through the screen and is discharged, and the remaining crushed stone is discharged along the secondary screen 7.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A vibrating graded stone crushing and screening machine, comprising a frame (3), characterized in that, The top of the frame (3) is equipped with a screening box (1), and the inner wall of the screening box (1) is provided with a primary screen (6) and a secondary screen (7) arranged side by side from top to bottom; Slide plates (13) are fixedly connected to both sides of the primary screen (6) and the secondary screen (7). Adjustment grooves (12) are symmetrically opened on the inner wall of the screening box (1). The adjustment grooves (12) are slidably connected to the slide plates (13). Two clamping plates (14) are fixedly connected to the slide plates (13) and the secondary screen (7) on the same side. The secondary screen (7) is located between the clamping plates (14). A screw (11) is fixedly connected to one side of the slide plates (13). The screw (11) passes through the adjustment groove (12). The screw (11) is threadedly connected to the screening box (1). A vibration mechanism is provided on the frame (3).

2. The vibrating graded stone screening machine as described in claim 1, characterized in that: The vibration mechanism includes a motor (5), the output shaft of which is fixedly connected to a vibration transmission shaft (8), the vibration transmission shaft (8) is fixedly connected to the screening box (1), and an eccentric block (4) is provided between the motor (5) and the vibration transmission shaft (8).

3. The vibrating graded stone screening machine as described in claim 1, characterized in that: The cross-sectional area of ​​the primary screen (6) is larger than that of the secondary screen (7), and the primary screen (6) is located directly above the secondary screen (7).

4. The vibrating graded stone screening machine as described in claim 1, characterized in that: The screw (11) is fitted with a reinforcing plate (9) on its outer wall. The screw (11) is threadedly connected to the reinforcing plate (9). A positioning pin (10) is provided through the reinforcing plate (9). The positioning pin (10) is inserted into the screening box (1).

5. A vibrating graded stone crushing and screening machine as described in claim 1, characterized in that: The adjustment groove (12) is T-shaped.

6. The vibrating graded stone crushing and screening machine as described in claim 1, characterized in that: The frame (3) has four fixed corners at the top with buffer springs (2), and the top of the buffer springs (2) is fixedly connected to the screening box (1).

7. A vibrating graded stone screening machine as described in claim 1, characterized in that: Both the primary screen (6) and the secondary screen (7) are provided with support frames (15) at their bottoms, and the support frames (15) are fixedly connected to the inner wall of the screening box (1).

8. A vibrating graded stone crushing and screening machine as described in claim 3, characterized in that: The primary screen (6) and the secondary screen (7) are set at an angle.

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