A screening device for road construction

Abstract

This utility model relates to a screening device for road construction, comprising: a support truss and a screening component. Two support trusses are present, and the screening component is mounted between the upper ends of the support trusses via a rotating shaft. Drive cylinders are mounted on both sides of the screening component and the support trusses via pins. The drive cylinders are used to drive the screening component to reciprocate and rotate. Through the reciprocating rotation of the screening component, the aggregate accelerates and slides on the surface of the screen frame, achieving automatic grading by utilizing the inertial difference between large-particle gravel and fine sand. Combined with the curved material lifting design of the herringbone separator and the forced material turning effect of the triangular guide frame, the aggregate turning frequency is increased, the screen hole clogging rate is reduced, and the screening efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of road construction technology, and in particular to a screening device for road construction. Background Technology

[0002] Sand and gravel aggregates are granular materials that serve as the skeleton and filler in concrete. There are two types: fine aggregates and coarse aggregates. To meet the technical requirements of different construction stages, aggregates of different particle sizes are usually required. For example, the aggregate particle sizes required for the base course and the pavement course of cement roads are different. Moreover, in order to improve the compressive strength of the pavement, the aggregate gradation will also change. Using aggregates with a single gradation or a single particle size can no longer meet the construction needs. Screening of sand and gravel aggregates is a key step in ensuring the quality of concrete.

[0003] In the prior art, CN214160481U discloses a raw material screening device for road construction. Specifically, by starting a rotary motor and a drive motor, the rotary motor drives the crushing roller to rotate, thereby crushing the raw material in the crushing box. The crushed raw material falls onto the screening plate through the discharge pipe. The drive motor drives the rotating rod to rotate, and the rotating rod drives the cam to rotate. The cam drives the screening plate to move up and down on the left and right sides, thereby causing the raw material on the screening plate to shake and be screened. The screened raw material falls onto the mounting plate and then falls out through the discharge pipe. The residue on the screening plate falls out through the box door on the left side of the screening box, thus achieving the purpose of automatic screening without manual operation.

[0004] The existing technology has the following drawbacks: 1. Although the existing technology can achieve screening by shaking the screening plate, large particles of gravel will always accumulate on the screening plate during screening, which cannot effectively separate and remove large impurities, affecting the screening efficiency and service life of the screening plate; 2. During the screening process, large particles of gravel and fine sand tend to move synchronously due to differences in inertia, and the aggregates tend to accumulate together, lacking a dynamic separation mechanism, resulting in low screening efficiency of the aggregates; Therefore, there is still room for improvement on the existing screening devices for road construction. Utility Model Content

[0005] In order to solve the problems existing in the background art, this utility model proposes a screening device for road construction.

[0006] The screening device for road construction provided in this application adopts the following technical solution: A screening device for road construction includes: a support truss and a screening component. There are two support trusses. The screening component is installed between the upper ends of the support trusses via a rotating shaft. Drive cylinders are installed between the two sides of the screening component and the support truss via pins. The drive cylinders are used to drive the screening component to reciprocate and rotate.

[0007] The screening assembly includes a screening frame, a screen frame, and a material blocking unit. The screening frame is mounted on the upper end of the drive cylinder via a pin. The screening frame has a rectangular hollow structure. The screen frame is installed at the lower end inside the screening frame, and the material blocking unit is installed at both the left and right ends of the screening frame.

[0008] Furthermore, the supporting truss has a triangular structure, and supporting vertical members are evenly arranged in the middle of the supporting truss.

[0009] Furthermore, a support plate is installed at the lower end of the support truss, and a weight sensing unit is installed inside the support plate.

[0010] Furthermore, a separator is fixedly installed in the middle of the screen frame. The separator has a herringbone cross-section and a smooth curved surface.

[0011] Furthermore, guide frames are evenly installed on the upper surface of the screen frame, and the cross-section of the guide frames is triangular. Screen holes are evenly opened on the screen frame located between adjacent guide frames.

[0012] Furthermore, the material blocking unit includes an opening groove, a sliding frame, a material blocking component, and a driving component. The lower end of the screening frame has an opening groove, and the sliding frame is slidably arranged in the opening groove. A rod is provided on one side of the sliding frame, and a slot that cooperates with the rod is provided on the screening frame. A sealing gasket is installed between the other side of the sliding frame and the opening groove. A material blocking component is installed between the upper end of the sliding frame and the screening frame. The material blocking component is arranged at an inclination. A driving component is installed at the lower end of the screening frame. The driving component adjusts the inclination of the material blocking component through the sliding frame.

[0013] Furthermore, the material stopper includes multiple telescopic rods arranged at equal intervals. The upper end of the telescopic rod is connected to the screening frame via a pin, and the lower end of the telescopic rod is connected to the sliding frame via a pin. A retractable protective pad is arranged between the outer sides of the telescopic rods.

[0014] Furthermore, the driving component includes a driving rod, a through hole is provided at the bottom of the screening frame, the driving rod is slidably disposed inside the through hole, the upper end of the driving rod is connected to the sliding frame by a steel wire rope, a telescopic spring is provided on the steel wire rope located inside the opening groove, an extrusion head is installed at the bottom of the driving rod by a pin, and a fixing plate that cooperates with the extrusion head is provided on the inner side of the support truss.

[0015] Beneficial effects Compared with the prior art, this utility model provides a screening device for road construction, which has the following beneficial effects: 1. This utility model utilizes the reciprocating tumbling motion of the screening components (driven by a drive cylinder) to accelerate the sliding of aggregates on the surface of the screen frame, thereby achieving automatic grading by taking advantage of the inertial difference between large-particle crushed stone and fine sand; combined with the curved material lifting design of the herringbone separator and the forced material turning effect of the triangular guide frame, the aggregate turning frequency is increased, the screen hole clogging rate is reduced, and the screening efficiency is improved.

[0016] 2. The present invention features a dual-state adaptive switching mechanism for the material blocking unit. When the screening frame gradually flips downward, it guides large particles of gravel to fly out at high speed along the inclined surface of the protective pad, resulting in high separation accuracy. When the screening frame descends to the lowest point, the telescopic rod is triggered by the drive component to retract, so that the protective pad forms a vertical barrier, which can trap fine sand and effectively solve the problem of fine material splashing in traditional equipment.

[0017] 3. In this utility model, the support plate is embedded with a weight sensing unit to monitor the aggregate load in real time. It automatically stops the machine when overloaded, avoiding deformation of the screen frame and extending the service life of the core components. At the same time, the triangular support truss and the uniform support vertical rods form an anti-torsion structure, which has small deformation under the reciprocating impact of the cylinder and high stability. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of this application.

[0020] Figure 2 This is a schematic diagram of a half-section structure of this application.

[0021] Figure 3 This is a cross-sectional structural diagram of this application.

[0022] Figure 4 This is a cross-sectional structural diagram of the screening component of this application.

[0023] Figure 5 This is a partial structural diagram of the screening component of this application.

[0024] Explanation of reference numerals in the attached drawings: 1. Support truss; 11. Support plate; 2. Screening assembly; 21. Screening frame; 22. Screen frame; 221. Divider frame; 222. Guide frame; 23. Material blocking unit; 231. Opening slot; 232. Sliding frame; 233. Material blocking component; 2331. Telescopic rod; 2332. Protective pad; 234. Driving component; 2341. Driving rod; 2342. Extrusion head; 2343. Fixing plate; 3. Driving cylinder. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-5 The present invention provides a screening device for road construction, comprising: a support truss 1 and a screening component 2. There are two support trusses 1. The screening component 2 is installed between the upper ends of the support trusses 1 via a rotating shaft. The two sides of the screening component 2 are connected to the support truss 1 via pins, and the driving cylinders 3 are used to drive the screening component 2 to reciprocate and rotate.

[0027] In the above technical solution, the sand and gravel aggregate to be screened is transported to the upper end of the screening component 2. By driving the cylinder 3 to reciprocate and extend, the screening component 2 can reciprocate and rotate on the support truss 1, so that the sand and gravel aggregate on the screening component 2 can reciprocate along the length of the screening component 2, thereby realizing the function of screening and filtering the sand and gravel aggregate, and ensuring that the screened aggregate meets the requirements of road construction.

[0028] The screening assembly 2 includes a screening frame 21, a screen frame 22, and a baffle unit 23. The screening frame 21 is installed between the upper ends of the drive cylinder 3 via a pin. The screening frame 21 has a rectangular hollow structure. The screen frame 22 is installed at the lower end inside the screening frame 21, and the baffle unit 23 is installed at both the left and right ends of the screening frame 21.

[0029] In the above technical solution, when screening sand and gravel aggregates, the sand and gravel aggregates are conveyed into the screening frame 21. The screen frame 22 first supports the sand and gravel aggregates. Then, the drive cylinder 3 drives the screening frame 21 to rotate up and down repeatedly. When one side of the screening frame 21 moves downward, the sand and gravel aggregates move downward synchronously along the surface of the screen frame 22. The large particles of crushed stone move at a fast speed, allowing them to fly out along the baffle unit 23. When one side of the screening frame 21 moves downward to the lowest point, the baffle unit 23 changes from an inclined state to a vertical state, thereby blocking the sand and gravel aggregates and preventing fine sand and gravel from flying out. Through the up and down rotation of the screening frame 21, the function of accurately screening large particles of crushed stone and fine sand and gravel can be achieved.

[0030] See Figures 1-3 As shown, in this preferred embodiment, the support truss 1 has a triangular structure, and support vertical rods are evenly arranged in the middle of the support truss 1.

[0031] See Figures 1-3 As shown, in this preferred embodiment, a support plate 11 is installed at the lower end of the support truss 1, and a weight sensing unit is provided inside the support plate 11.

[0032] In the above technical solution, the supporting vertical rod can further play a role in stability, the support plate 11 can increase the contact area with the ground, and the weight sensing unit can measure the weight of the sand and gravel aggregate at the upper end of the screen frame 22, so as to avoid low screening efficiency caused by too much sand and gravel aggregate, and prevent exceeding the maximum load capacity of the screen frame 22, thereby improving the service life of the screen frame 22.

[0033] See Figure 4 As shown, as a preferred technical solution in this embodiment, a separator 221 is fixedly installed in the middle of the screen frame 22. The separator 221 has a herringbone cross-section and a smooth curved surface structure.

[0034] In the above technical solution, when the sand and gravel aggregate moves along the surface of the screen frame 22, when the sand and gravel aggregate moves past the upper end of the separator 221, since the separator 221 is an upward inclined structure, the separator 221 can play the function of guiding and conveying the sand and gravel aggregate, so that the sand and gravel can be lifted up, thereby allowing the sand and gravel aggregate to fully contact the screen frame 22, thereby improving the screening efficiency of the sand and gravel aggregate.

[0035] See Figures 4-5 As shown, as a preferred technical solution of this embodiment, guide frames 222 are uniformly installed on the upper surface of the screen frame 22. The cross-section of the guide frame 222 is triangular, and screen holes are uniformly opened on the screen frame 22 between adjacent guide frames 222.

[0036] In the above technical solution, the guide frame 222 can further guide the sand and gravel aggregate, so that the sand and gravel aggregate can be effectively turned over when it moves on the surface of the screen frame 22, avoiding the accumulation of sand and gravel aggregate on the surface of the screen frame 22, further improving the screening efficiency, and the screened aggregate falls along the screen holes.

[0037] See Figure 5As shown, in a preferred embodiment, the material blocking unit 23 includes an opening slot 231, a sliding frame 232, a material blocking component 233, and a driving component 234. The screening frame 21 has an opening slot 231 at its lower end, and the sliding frame 232 is slidably arranged in the opening slot 231. A rod is provided on one side of the sliding frame 232, and a slot that cooperates with the rod is provided on the screening frame 21. A sealing gasket is installed between the other side of the sliding frame 232 and the opening slot 231. A material blocking component 233 is installed between the upper end of the sliding frame 232 and the screening frame 21. The material blocking component 233 is arranged at an inclination. The driving component 234 is installed at the lower end of the screening frame 21, and the driving component 234 adjusts the inclination of the material blocking component 233 through the sliding frame 232.

[0038] In the above technical solution, when screening sand and gravel aggregates, as one side of the screening frame 21 gradually moves downward, the sand and gravel aggregates will simultaneously tilt downward. Since the heavier crushed stone moves faster and the lighter sand and gravel moves slower, the larger crushed stone particles will first fly outward along the inclined baffle 233, thereby separating the larger crushed stone particles and preventing them from remaining on the surface of the screen frame 22. When one side of the screening frame 21 moves downward to its lowest point, the drive component 234 contacts the lower end of the support truss 1 and is squeezed upward, allowing the drive component 234 to pull the sliding frame 232, thereby causing the baffle 233 to contract inward, changing the baffle 233 from an inclined state to a vertical state (perpendicular to the surface of the screen frame 22). This allows the fine sand and gravel to be blocked inside the screening frame 21 for subsequent screening, improving the screening efficiency and effect of the sand and gravel aggregates.

[0039] See Figure 5 As shown, as a preferred technical solution of this embodiment, the material stop 233 includes a plurality of telescopic rods 2331 arranged at equal intervals. The upper end of the telescopic rod 2331 is connected to the screening frame 21 by a pin, and the lower end of the telescopic rod 2331 is connected to the sliding frame 232 by a pin. A retractable protective pad 2332 is arranged between the outer sides of the telescopic rods 2331.

[0040] In the above technical solution, when the lower end of the driving component 234 is squeezed and moves upward, the driving component 234 pulls the sliding frame 232 to move outward, and at the same time the telescopic rod 2331 retracts, so that the protective pads 2332 on the outside of the multiple telescopic rods 2331 change from an inclined state to a vertical state, thereby preventing small particles of sand and gravel from flying outward.

[0041] See Figure 5As shown, in this preferred embodiment, the driving component 234 includes a driving rod 2341. The bottom of the screening frame 21 is provided with a through hole. The driving rod 2341 is slidably disposed inside the through hole. The upper end of the driving rod 2341 is connected to the sliding frame 232 by a steel wire rope. A telescopic spring is provided on the steel wire rope located inside the opening groove 231. An extrusion head 2342 is installed at the bottom of the driving rod 2341 by a pin. A fixing plate 2343 that cooperates with the extrusion head 2342 is provided on the inner side of the support truss 1.

[0042] In the above technical solution, when the screening frame 21 flips downward, the lower end of the drive rod 2341 will contact the fixed plate 2343 installed on the support truss 1. The fixed plate 2343 will block the drive rod 2341, causing the drive rod 2341 to move upward. The drive rod 2341 pulls the sliding frame 232 through the wire rope. The sliding frame 232 drives the baffle 233 from the inclined state to the vertical state, thereby preventing small particles of sand and gravel from flying out.

[0043] The working principle of this utility model is as follows: S1: Aggregate loading and initial turning The sand and gravel aggregate to be screened is transported into the screening frame 21 and carried by the screen frame 22. The drive cylinder 3 is started, pushing the screening component 2 to reciprocate around the rotating shaft. The weight sensing unit in the support plate 11 monitors the weight of the aggregate in real time. If overloaded, an alarm is triggered or the machine is stopped to prevent the screen frame 22 from being damaged by overload.

[0044] S2: Separation and Guided Screening of Large Aggregates During the continuous downward movement of the screening frame 21: the aggregate accelerates down the surface of the screen frame 22 under the action of gravity, and the large particles of crushed stone move to the edge of the frame first due to their large inertia and high speed; the inclined baffle 233 guides the large particles of crushed stone to fly outward, realizing the separation of coarse materials; when the aggregate passes through the herringbone separator 221, it is lifted up to enhance the contact with the screen; the triangular guide frame 222 further turns the aggregate to avoid accumulation, and the fine materials fall through the screen holes.

[0045] S3: Material stop unit switching and fine material interception When the screening frame 21 is tilted down to its lowest point: the extrusion head 2342 at the bottom of the drive rod 2341 contacts the fixed plate 2343 on the support truss 1, causing the drive rod 2341 to be squeezed and move upward; the drive rod 2341 pulls the sliding frame 232 inward through the wire rope, which in turn drives the telescopic rod 2331 to retract; the protective pad 2332 changes from an inclined state to a vertical state (perpendicular to the screen frame), forming a barrier to prevent small particles of sand and gravel from flying out, ensuring that they remain in the screening frame 21 for continued screening.

[0046] S4: Circulating screening The screening of sand and gravel aggregates is achieved by driving the cylinder 3 to rotate the screening frame 21 back and forth. The weight sensing unit can add aggregates to the screening frame 21 in real time, thereby realizing continuous cyclic screening of sand and gravel aggregates.

[0047] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A screening device for road construction, characterized in that, include: The support truss (1) and the screening assembly (2) are provided. There are two support trusses (1). The screening assembly (2) is installed between the upper ends of the support trusses (1) through a rotating shaft. The two sides of the screening assembly (2) are connected to the support truss (1) through pins. The driving cylinder (3) is used to drive the screening assembly (2) to reciprocate and rotate. The screening assembly (2) includes a screening frame (21), a screen frame (22), and a baffle unit (23). The screening frame (21) is installed between the upper ends of the drive cylinder (3) via a pin. The screening frame (21) has a rectangular hollow structure. The screen frame (22) is installed at the lower end inside the screening frame (21). The baffle unit (23) is installed at both the left and right ends of the screening frame (21).

2. The screening device for road construction according to claim 1, characterized in that: The supporting truss (1) has a triangular structure, and supporting vertical rods are evenly arranged in the middle of the supporting truss (1).

3. The screening device for road construction according to claim 1, characterized in that: The lower end of the support truss (1) is equipped with a support plate (11), and a weight sensing unit is provided inside the support plate (11).

4. A screening device for road construction according to claim 1, characterized in that: A separator (221) is fixedly installed in the middle of the screen frame (22). The separator (221) has a herringbone cross-section and a smooth curved surface.

5. A screening device for road construction according to claim 1, characterized in that: The upper surface of the screen frame (22) is uniformly equipped with guide frames (222), the cross-section of the guide frames (222) is triangular, and the screen frames (22) located between adjacent guide frames (222) are uniformly provided with screen holes.

6. A screening device for road construction according to claim 1, characterized in that: The baffle unit (23) includes an opening slot (231), a sliding frame (232), a baffle (233), and a drive unit (234). The lower end of the screening frame (21) has an opening slot (231), and the sliding frame (232) is slidably arranged in the opening slot (231). A rod is provided on one side of the sliding frame (232), and a slot that cooperates with the rod is provided on the screening frame (21). A sealing gasket is installed between the other side of the sliding frame (232) and the opening slot (231). A baffle (233) is installed between the upper end of the sliding frame (232) and the screening frame (21). The baffle (233) is arranged at an inclination. The lower end of the screening frame (21) is equipped with a drive unit (234), and the drive unit (234) adjusts the inclination of the baffle (233) through the sliding frame (232).

7. A screening device for road construction according to claim 6, characterized in that: The baffle (233) includes multiple telescopic rods (2331) arranged at equal intervals. The upper end of the telescopic rod (2331) is connected to the screening frame (21) by a pin, and the lower end of the telescopic rod (2331) is connected to the sliding frame (232) by a pin. A retractable protective pad (2332) is arranged between the outer sides of the telescopic rod (2331).

8. A screening device for road construction according to claim 6, characterized in that: The driving component (234) includes a driving rod (2341). The bottom of the screening frame (21) is provided with a through hole. The driving rod (2341) is slidably disposed inside the through hole. The upper end of the driving rod (2341) is connected to the sliding frame (232) by a steel wire rope. A telescopic spring is provided on the steel wire rope located inside the opening groove (231). The bottom of the driving rod (2341) is installed with an extrusion head (2342) by a pin. A fixing plate (2343) that cooperates with the extrusion head (2342) is provided on the inner side of the support truss (1).

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