A sand screening device for construction

Abstract

The application discloses a sand screening device for building, and belongs to the technical field of devices for building engineering. The device comprises a mounting frame, a sand screening roller is arranged on the mounting frame, fixing plates are arranged on the mounting frame outside the two ends of the sand screening roller, through holes are arranged on the upper ends of the fixing plates, hollow first rotating shafts are arranged in the through holes, the first rotating shafts are arranged through the middle part of the sand screening roller, a plurality of hollow rotating discs are arranged on the first rotating shafts, the middle part of each hollow rotating disc is fixed on the first rotating shaft, the first rotating shaft is in communication with the hollow rotating disc, a plurality of air exhaust holes are arranged on the surface of each hollow rotating disc, one end of each first rotating shaft is closed, a rotating joint is arranged on the other end of each first rotating shaft, an air inlet pipe is arranged on the rotating joint, one end of the air inlet pipe is connected with the rotating joint, and a gas supply assembly is arranged on the other end of the air inlet pipe. The technical scheme is used to solve the problems of low screening efficiency and poor screening effect of the existing device on the damp and caked sand.

Description

Technical Field

[0001] The invention belongs to the technical field of devices for construction engineering, and particularly relates to a sand screening device for construction. Background Art

[0002] Sand is an essential raw material in the construction industry. It contains a variety of impurities, such as gravel and garbage. Sand particles are also classified into different grades, and different uses require different particle sizes. Therefore, sand screening is necessary before use.

[0003] There are many sand screening machines on the market, which are basically the same. The most commonly used one is the drum-type sand screening device. However, sometimes the sand is relatively moist when it rains and is easy to clump. The clumped sand is difficult to be dispersed and screened in the drum screen, so most of the clumped sand is discharged. The discharged clumped sand needs to be screened multiple times in the future, which will lead to low sand screening efficiency and poor effect. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a sand screening device for construction, so as to solve the problems of low screening efficiency and poor screening effect of wet agglomerated sand in existing devices.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a sand screening device for construction, including a mounting frame, a sand screening drum is provided on the mounting frame, and fixing plates are provided on the outer mounting frames at both ends of the sand screening drum, and a through hole is provided at the upper end of the fixing plate, and a hollow first rotating shaft is provided in the through hole, and the first rotating shaft is arranged to pass through the middle of the sand screening drum, and a plurality of hollow rotating discs are provided on the first rotating shaft, and the middle part of the hollow rotating disc is fixed on the first rotating shaft, and the first rotating shaft is connected to the interior of the hollow rotating disc, and a plurality of exhaust holes are provided on the surface of the hollow rotating disc, one end of the first rotating shaft is closed, and a rotating joint is provided on the other end of the first rotating shaft, and an air intake pipe is provided on the rotating joint, one end of the air intake pipe is connected to the rotating joint, and an air supply component is provided on the other end of the air intake pipe.

[0007] The working principle of this technical solution is:

[0008] When construction sand enters from one end of the sand screening drum, the sand contains a large amount of water, causing the sand to stick together. Therefore, under the rotation of the sand screening drum, the sand will be driven to the upper part of the sand screening drum, and then fall downward under the gravity of the sand. On the way of falling, the sand will contact the hollow rotating disc, causing a collision, so that the adhered sand is broken up. At the same time, the air supply component supplies air into the first rotating shaft, and the gas is discharged from the exhaust hole. The discharged gas will contact the sand in the falling process, further blowing away the sand, so that the adhered sand is blown away into particles, which is convenient for subsequent passage through the sieve holes of the sand screening drum. It is not difficult to understand that the adhered sand may go through multiple cycles before being blown away and hit into particles.

[0009] Furthermore, the exhaust holes are arranged obliquely on the hollow rotary disc. The advantage is that the exhaust holes are arranged obliquely, and under the action of gas, the hollow rotary disc will be driven to rotate, thereby achieving rotational collision with the adhered sand, further enhancing the effect of impacting and dispersing the adhered sand. At the same time, the obliquely arranged exhaust holes are more convenient for discharging the sand entering therein under the action of the rotating centrifugal force. Of course, the preferred way is to make the rotation direction of the hollow rotary disc opposite to the rotation direction of the sand screening drum.

[0010] Furthermore, a spherical top rod is provided on the fixing plate at one end of the first rotating shaft, a fixing ring with a sloped surface is fixed on the rotating shaft, a limiting ring is provided on the other end of the first rotating shaft for sliding connection therewith, a return spring is provided between the limiting ring and the hollow rotating disc, and under the action of the return spring, the spherical top rod contacts the sloped surface of the fixing ring. The benefit is that when the hollow rotating disc rotates, the first rotating shaft is pushed to move back and forth continuously under the action of the spherical top rod, the sloped surface and the return spring, and the sticky sand falling between adjacent hollow rotating discs can be intercepted and moved and impacted during the movement, thereby further improving the dispersion effect of the sticky sand.

[0011] Furthermore, a plurality of shifting rods evenly distributed around the circumference are provided on the inner wall of the sand screening drum. The advantage is that when the sand screening drum rotates, the shifting rods can carry the adhesive sand at the bottom to the upper part, thereby improving the carrying effect of the sand screening drum on the adhesive sand.

[0012] Furthermore, a plurality of paddles are evenly distributed on the circumference of the outer edges of the plurality of rotating discs. The advantage of the paddles is that the arrangement of the paddles can squeeze the bonded sand at the bottom of the sand screening drum, so that the bonded sand is squeezed and dispersed.

[0013] Furthermore, a first drive assembly for driving the first rotating shaft to rotate is provided on the closed end of the first rotating shaft. The rotation direction of the sand screening drum is opposite to that of the first rotating shaft. The benefit is that the setting of the first drive assembly can assist the rotation effect of the first rotating shaft. At the same time, the rotation direction of the sand screening drum is opposite to that of the hollow rotating disc, which can achieve a positive collision with the adhered sand and enhance the impact and dispersion effect on the adhered sand.

[0014] Furthermore, the first drive assembly includes a first drive motor, a first pulley, a second pulley and a first belt, the first pulley is fixed to the closed end of the first rotating shaft, the second pulley is fixed to the output end of the first drive motor, the first drive motor is fixed to the mounting frame, and the first belt is installed on the first pulley and the second pulley.

[0015] Furthermore, it also includes a second drive assembly arranged on the mounting frame for driving the sand screening drum to rotate, the second drive assembly includes a mounting ring, a rubber wheel, a second rotating shaft, a third pulley, a fourth pulley, a second belt and a second drive motor, the mounting ring is arranged on both ends of the sand screening drum, the rubber wheel is symmetrically arranged at the lower part of the mounting ring, the sand screening drum is lifted on the mounting frame, the second rotating shaft rotatably connects the rubber wheel to the mounting frame, the third pulley is arranged on one end of the second rotating shaft, the second drive motor is fixed on the mounting frame, the fourth pulley is arranged on the second drive motor, and the second belt is installed on the third pulley and the fourth pulley.

[0016] Furthermore, the air supply assembly supplies hot air into the air inlet pipe, which has the advantage that the hot air can dry the sand and reduce the moisture in the sand, thereby reducing its adhesion effect.

[0017] Furthermore, both ends of the mounting frame are provided with a lifting cylinder for changing the inclination angle of the sand screening drum. The advantage is that the inclination angle of the sand screening drum is preferably adjustable. Therefore, when it is horizontal, the sand will be continuously turned and dispersed in the screening drum. After dispersion, the discharge end will be tilted to discharge impurities in the sand during the rotation process. The tilting setting can be achieved by arranging a lifting cylinder at the end of the mounting frame, which will not be elaborated here.

[0018] The beneficial effects of the present invention are:

[0019] (1) In this technical solution, compressed air is introduced into the hollow rotating disc to impact and blow the wet and sticky sand, thereby loosening the sticky sand and facilitating the subsequent sand screening operation of the sand screening drum; (2) The arrangement of the spherical top rod, the fixed ring and the reset spring enables the hollow rotating disc to perform reciprocating translation during the rotation process, thereby intercepting and moving the sticky sand that falls from the sand screening drum, further improving the crushing and dispersion effect of the sticky sand; (3) The structure of this device is simple and it is cleverly arranged in the existing shaftless drum screen, which can well solve the problem of screening wet sand and has strong practicality.

[0020] Additional advantages, objects, and features of the application will be set forth in part by the description that follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the application. The objectives and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] To make the objectives, technical solutions and beneficial effects of the present application clearer, the present application is described below with the help of the following drawings:

[0022] Figure 1 It is a perspective view of the sand screening device of the present application;

[0023] Figure 2 It is another perspective view of the sand screening device of the present application;

[0024] Figure 3 It is a front view and cross-sectional view of the sand screening device of the present application;

[0025] Figure 4 It is an installation perspective view of the hollow rotating disc inside the sand screening device of the present application;

[0026] Figure 5 It is another installation perspective view of the hollow rotating disc inside the sand screening device of the present application;

[0027] Figure 6 It is an installation view of the push rod of the present application.

[0028] In the drawings, the following signs are used:

[0029] Mounting frame 1, sand screening drum 2, mounting ring 3, rubber wheel 4, second rotating shaft 5, third belt pulley 6, second driving motor 7, fourth belt pulley 8, second belt 9, fixed plate 10, first rotating shaft 11, hollow rotating disc 12, exhaust hole 13, first driving motor 14, first belt pulley 15, second belt pulley 16, first belt 17, fixed ring 18, spherical ejector rod 19, air inlet pipe 20, air supply assembly 21, rotating joint 22, limiting ring 23, return spring 24, push plate 25, push rod 26. DETAILED DESCRIPTION

[0030] As shown in Figures 1 to 6 , the present application is as Figures 1 to 6As shown, the present invention provides a sand screening device for construction, including a mounting frame 1, a sand screening drum 2 is provided on the mounting frame 1, and fixed plates 10 are provided on the outer sides of the two ends of the sand screening drum 2, and a through hole is provided at the upper end of the fixed plate 10, a hollow first rotating shaft 11 is provided in the through hole, and the first rotating shaft 11 is arranged through the middle of the sand screening drum 2, and a plurality of hollow rotating discs 12 are provided on the first rotating shaft 11, and the middle part of the hollow rotating disc 12 is fixed on the first rotating shaft 11, and the first rotating shaft 11 is connected to the inside of the hollow rotating disc 12, and a plurality of exhaust holes 13 are provided on the surface of the hollow rotating disc 12, one end of the first rotating shaft 11 is closed, and a rotating joint 22 is provided on the other end of the first rotating shaft 11, and an air intake pipe 20 is provided on the rotating joint 22, and an air supply component 21 is provided on the other end of the air intake pipe 20.

[0031] The working principle of this technical solution is:

[0032] When construction sand enters from one end of the sand screening drum 2, the sand contains a large amount of water, causing the sand to stick together. Therefore, under the rotation of the sand screening drum 2, the sand will be driven to the upper part of the sand screening drum 2, and then fall downward under the gravity of the sand. On the way of falling, the sand will contact the hollow rotary disc 12, causing a collision, so that the adhered sand is broken up. At the same time, the air supply component 21 supplies air into the first rotating shaft 11, and the gas is discharged from the exhaust hole 13. The discharged gas will contact the sand in the falling process, further blowing away the sand, so that the adhered sand is blown away into particles, which is convenient for subsequent passage through the sieve holes of the sand screening drum 2. It is not difficult to understand that the adhered sand may go through multiple cycles before being blown away and hit into particles.

[0033] The exhaust holes 13 are arranged obliquely on the hollow rotating disc 12. The oblique arrangement of the exhaust holes 13 drives the hollow rotating disc 12 to rotate under the action of the gas, thereby achieving a rotational collision with the adhered sand, further enhancing the collision and dispersion effect on the adhered sand. At the same time, the oblique arrangement of the exhaust holes 13 facilitates the discharge of the sand that has entered therein under the action of the rotating centrifugal force. Of course, it is preferred that the rotation direction of the hollow rotating disc 12 is opposite to the rotation direction of the sand screening drum 2. It should be noted that the oblique arrangement here can be set to be inclined in a circumferential direction so that the thrust generated by the compressed gas does not cancel each other out.

[0034] A spherical top rod 19 is provided on the fixing plate 10 at one end of the first rotating shaft 11. The spherical top rod 19 can be understood as a rod with a ball head at the end thereof, which reduces the friction force with the fixing ring 18. A fixing ring 18 with a sloped surface is fixed to the first rotating shaft 11. The sloped surface refers to a sloped surface with a high-low transition. A limiting ring 23 is provided at the other end of the first rotating shaft 11 and is slidably connected thereto. A return spring 24 is provided between the limiting ring 23 and the hollow rotating disc 12. Under the action of the return spring 24, the spherical top rod 19 contacts the sloped surface of the fixing ring 18. When the hollow rotating disc 12 rotates, under the action of the spherical top rod 19, the sloped surface and the return spring 24, the first rotating shaft 11 will be pushed to move back and forth continuously. During the movement, the bonded sand falling between the adjacent hollow rotating discs 12 can be intercepted and moved to collide, thereby further improving the dispersion effect of the bonded sand.

[0035] The inner wall of the sand screening drum 2 is equipped with several levers 26 evenly spaced around its circumference. As the sand screening drum 2 rotates, the levers 26 can lift the adhering sand from the bottom to the top, improving the sand carrying efficiency of the sand screening drum 2. Several shifting plates 25 are evenly spaced around the outer edges of the rotating discs. These shifting plates 25 squeeze and disperse the adhering sand at the bottom of the sand screening drum 2. In this embodiment, the number of rotating discs is ten, which can be determined based on the length of the shaftless drum screen. The spacing between adjacent hollow rotating discs 12 is preferably 10-20 cm, specifically 15 cm.

[0036] A first drive assembly is provided at the closed end of the first rotating shaft 11 for driving the rotation of the first rotating shaft 11. The sand screening drum 2 rotates in the opposite direction to the first rotating shaft 11. The provision of the first drive assembly can assist the rotation of the first rotating shaft 11. At the same time, the sand screening drum 2 rotates in the opposite direction to the hollow rotating disc 12, which can achieve a positive collision with the cohesive sand, thereby enhancing the impact and dispersion effect on the cohesive sand. The first drive assembly includes a first drive motor 14, a first pulley 15, a second pulley 16, and a first belt 17. The first pulley 15 is fixed to the closed end of the first rotating shaft 11, the second pulley 16 is fixed to the output end of the first drive motor 14, the first drive motor 14 is fixed to the mounting frame 1, and the first belt 17 is mounted on the first pulley 15 and the second pulley 16.

[0037] It also includes a second drive assembly arranged on the mounting frame 1 for driving the sand screening drum 2 to rotate. The second drive assembly includes a mounting ring 3, a rubber wheel 4, a second rotating shaft 5, a third pulley, a fourth pulley 8, a second belt 9 and a second drive motor 7. The mounting ring 3 is arranged on both ends of the sand screening drum 2, and the rubber wheel 4 is symmetrically arranged at the lower part of the mounting ring 3. The sand screening drum 2 is lifted on the mounting frame 1. The second rotating shaft 5 rotates the rubber wheel 4 and connects it to the mounting frame 1. The third pulley is arranged on one end of the second rotating shaft 5. The second drive motor 7 is fixed to the mounting frame 1. The fourth pulley 8 is arranged on the second drive motor 7. The second belt 9 is installed on the third pulley and the fourth pulley 8. This design method can form a drive form of a shaftless drum screen without interfering with the internally arranged components. Of course, the first drive assembly and the second drive assembly can be respectively arranged at both ends of the hollow rotating disc 12, or at one end, preferably at one end, so as to reduce the impact on the loading of one end.

[0038] Air supply assembly 21 supplies hot air into air inlet pipe 20. The hot air dries the sand and reduces its moisture content, thereby reducing its adhesion. It should be noted that air supply assembly 21 can be an air compressor and some piping components. A heating wire can be provided on the piping components to generate hot air. The method of preparing compressed air with an air compressor is conventional and will not be elaborated on here.

[0039] It should also be noted that the rotating joint 22 is a prior art and will not be described in detail here. At the same time, the shaftless drum screen should also include components such as an upper hopper, which are all prior art and will not be described in detail here. At the same time, the present invention mainly solves the problem that the sticky sand is difficult to disperse for screening. As for the problem of clogging the sieve holes, it can be solved by setting a vibrating rod or a beating rod on the outside of the sand screening drum. At the same time, the outlet end of the shaftless drum screen can be tilted to facilitate the discharge of impurities after guidance and screening.

[0040] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A sand screening device for construction, characterized by: The invention comprises a mounting frame, wherein the mounting frame is provided with a sand screening drum, and the mounting frames on the outer sides of both ends of the sand screening drum are provided with fixing plates, the upper end of the fixing plate is provided with a through hole, a hollow first rotating shaft is provided in the through hole, the first rotating shaft is provided through the middle part of the sand screening drum, a plurality of hollow rotating discs are provided on the first rotating shaft, the middle part of the hollow rotating discs is fixed on the first rotating shaft, and the first rotating shaft is communicated with the inside of the hollow rotating disc, a plurality of exhaust holes are provided on the surface of the hollow rotating disc, one end of the first rotating shaft is closed, and a rotating joint is provided on the other end of the first rotating shaft, an air intake pipe is provided on the rotating joint, one end of the air intake pipe is connected to the rotating joint, and an air supply component is provided on the other end of the air intake pipe; The exhaust hole is obliquely arranged on the hollow rotary disc; a spherical top rod is provided on the fixing plate at one end of the first rotating shaft, a fixing ring with a sloped surface is fixed on the first rotating shaft, and a limiting ring slidably connected to it is provided on the other end of the first rotating shaft, and a return spring is provided between the limiting ring and the hollow rotating disc, and under the action of the return spring, the spherical top rod contacts the sloped surface of the fixing ring; under the action of the spherical top rod, the sloped surface and the return spring, the first rotating shaft will be pushed to move back and forth continuously, and the sticky sand falling between adjacent hollow rotating discs can be intercepted and moved and impacted during the movement; a number of shift plates are evenly distributed on the circumference of the outer edges of several of the hollow rotating discs; a first drive assembly for driving the first rotating shaft to rotate is provided on the closed end of the first rotating shaft, and the sand screening drum rotates in the opposite direction to the first rotating shaft.

2. A construction sand screening device according to claim 1, characterized in that: A plurality of shifting rods evenly distributed around the circumference are provided on the inner wall of the sand screening drum.

3. A construction sand screening device according to claim 1, characterized in that: The first drive assembly includes a first drive motor, a first pulley, a second pulley and a first belt, the first pulley is fixed to the closed end of the first rotating shaft, the second pulley is fixed to the output end of the first drive motor, the first drive motor is fixed to the mounting frame, and the first belt is installed on the first pulley and the second pulley.

4. A construction sand screening device according to claim 1, characterized in that: It also includes a second drive assembly arranged on the mounting frame for driving the sand screening drum to rotate, the second drive assembly includes a mounting ring, a rubber wheel, a second rotating shaft, a third pulley, a fourth pulley, a second belt and a second drive motor, the mounting ring is arranged on both ends of the sand screening drum, the rubber wheel is symmetrically arranged at the lower part of the mounting ring, the sand screening drum is lifted on the mounting frame, the second rotating shaft rotatably connects the rubber wheel to the mounting frame, the third pulley is arranged on one end of the second rotating shaft, the second drive motor is fixed on the mounting frame, the fourth pulley is arranged on the second drive motor, and the second belt is installed on the third pulley and the fourth pulley.

5. The construction sand screening device according to claim 1, characterized in that: The air supply component supplies hot air into the air inlet pipe.

6. A construction sand screening device according to claim 1, characterized in that: Both ends of the mounting frame are provided with lifting cylinders for changing the inclination angle of the sand screening drum.

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