Sand screening device for building

Abstract

The utility model relates to the technical field of building construction, and discloses a building sand screening device which comprises a support, a first screening plate, a second screening plate, a third screening plate, a cover plate and a discharging port, the first screening plate is located at the top of the support, the second screening plate is located at the top of the first screening plate, and the third screening plate is located at the top of the second screening plate. The cover plate is located on the top of the third sieve plate and fixedly installed on the top of the third sieve plate through bolts. The sand screening device solves the problems that in the process of screening sandy soil through a sand screening device, the sandy soil needs to be poured into an inner cavity of a screening plate of a screening machine, but the screening machine usually adopts a single screening plate for screening, so that only specific foreign matter in the sandy soil can be screened out, and there is no assembly for distinguishing and screening the foreign matter in the sandy soil according to different sizes; and therefore, it is inconvenient for a user to concentrate foreign matters of different sizes, and the screening efficiency of sandy soil is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, in particular to a sand screening device for construction. Background Art

[0002] Commonly used sand screening equipment in construction includes vibrating screens and drum screens. The function of these devices is to screen the sand and remove impurities and uneven particles to ensure that the quality of the sand used in the construction meets the requirements. Sand screening devices usually have efficient screening capabilities and can quickly separate impurities and uneven particles in the sand to improve construction efficiency. Some sand screening devices have adjustable sieve hole sizes or screen specifications to adapt to sand of different particle sizes and meet different construction requirements. Due to the complex construction environment, sand screening devices usually need to have strong wear and corrosion resistance to ensure long-term stable operation.

[0003] The working principle of this sand screening device is usually to use continuous vibration to place sand on the screen or sieve holes, and through the action of the sieve holes or screen, separate the impurities and uneven particles in the sand, so as to achieve the purpose of screening. The vibrating screen generates centrifugal force through vibration to screen the sand, so as to improve the quality of sand. The problem with the above technology is that in the process of using the sand screening device to screen the sand, the sand needs to be poured into the inner cavity of the sieve plate of the screening machine, but the screening machine usually uses a single sieve plate for screening, so only specific foreign matter in the sand can be screened out, and there is no component for distinguishing and screening foreign matter in the sand according to different sizes, which makes it inconvenient for users to concentrate foreign matter of different sizes, thereby reducing the screening efficiency of the sand. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a construction sand screening device which can overcome the above problems or at least partially solve the above problems.

[0005] The utility model is implemented as follows: a sand screening device for construction comprises a bracket, a first sieve plate, a second sieve plate, a third sieve plate, a cover plate and a feed opening, wherein the first sieve plate is located at the top of the bracket, the second sieve plate is located at the top of the first sieve plate, the third sieve plate is located at the top of the second sieve plate, the cover plate is located at the top of the third sieve plate and is fixedly installed with the top of the third sieve plate by bolts, the feed opening is located at the top of the cover plate and is fixedly connected with the inner cavity of the cover plate; the left and right sides of the first sieve plate, the second sieve plate and the third sieve plate are provided with connecting mechanisms; the rear sides of the first sieve plate, the second sieve plate and the third sieve plate are provided with a transmission mechanism used in conjunction with the connecting mechanism.

[0006] In order to improve the connection effect between the first sieve plate, the second sieve plate, the third sieve plate and the bracket, preferably, the connecting mechanism includes an arc block, a first spring and a second spring, the number of the arc blocks is multiple and evenly distributed on the left and right sides of the first sieve plate, the second sieve plate and the third sieve plate and fixedly connected to the surfaces of the first sieve plate, the second sieve plate and the third sieve plate, the number of the first springs is multiple and evenly distributed at the opposite ends of the multiple arc blocks and fixedly connected to the surfaces of the arc blocks, the number of the second springs is multiple and evenly distributed on the left and right sides of the top of the bracket, and the top of the second spring is fixedly connected to the surface of the bottom arc block. By setting the connecting mechanism, the multiple arc blocks and the first spring can strengthen the connection effect between the first sieve plate, the second sieve plate and the third sieve plate, and avoid the situation where the vibration amplitude between the first sieve plate, the second sieve plate and the third sieve plate is reduced by welding.

[0007] In order to improve the ease of use of the first sieve plate, the second sieve plate and the third sieve plate, preferably, the transmission mechanism includes a transmission plate, a vibration motor and a connecting frame, the connecting frame is located on the front side of the vibration motor and is fixedly connected to the vibration motor, the left and right sides of the connecting frame are fixedly mounted to the rear side of the transmission plate by bolts, the front side of the transmission plate is fixedly connected to the surface of the rear side of the first sieve plate, the second sieve plate and the third sieve plate, by setting up the transmission mechanism, the vibration motor can be quickly installed on the transmission plate through the connecting frame, and after installation, the first sieve plate, the second sieve plate and the third sieve plate can be quickly driven by the transmission plate to perform vibratory screening.

[0008] In order to improve the screening effect of the first sieve plate, the second sieve plate and the third sieve plate, preferably, the inner cavities of the first sieve plate, the second sieve plate and the third sieve plate are all provided with filter holes, and the number of the filter holes is multiple and evenly distributed in the inner cavities of the first sieve plate, the second sieve plate and the third sieve plate, and the aperture of the filter holes in the inner cavity of the second sieve plate is larger than the filter holes in the inner cavity of the first sieve plate and smaller than the filter holes in the inner cavity of the third sieve plate. By setting the filter holes, multiple filter holes can achieve the effect of facilitating the user to screen the sand, and the sizes of the filter holes opened in the inner cavities of the first sieve plate, the second sieve plate and the third sieve plate are different, which can achieve the effect of quickly distinguishing and screening according to the size of foreign matter, thereby facilitating the user to centrally process foreign matter of different sizes.

[0009] In order to improve the material guiding effect between the first sieve plate, the second sieve plate and the third sieve plate, preferably, the bottom of the first sieve plate, the second sieve plate and the third sieve plate are fixedly connected with material guiding blocks, the material guiding block at the bottom of the third sieve plate is horizontally aligned with the top of the second sieve plate, and the material guiding block at the bottom of the second sieve plate is horizontally aligned with the top of the first sieve plate. By setting the material guiding blocks, the material guiding blocks are evenly distributed at the bottom of the first sieve plate, the second sieve plate and the third sieve plate, which can achieve the effect of quickly guiding the sand and soil that pass through the filter holes to the bottom, thereby avoiding the situation where the sand and soil cannot stably dock with the bottom sieve plate.

[0010] In order to improve the cleaning convenience of the first sieve plate, the second sieve plate and the third sieve plate, preferably, the front sides of the first sieve plate, the second sieve plate and the third sieve plate are movably connected with baffles, and the left and right sides of the first sieve plate, the second sieve plate and the third sieve plate are provided with positioning pins used in conjunction with the baffles. By providing the baffles and the positioning pins, the positioning pins can facilitate the user to quickly connect and fix the baffles to the first sieve plate, the second sieve plate and the third sieve plate, so as to achieve the effect of quickly sealing the openings of the first sieve plate, the second sieve plate and the third sieve plate.

[0011] In order to improve the positioning stability of the baffle, preferably, connecting holes are provided on the left and right sides of the first sieve plate, the second sieve plate and the third sieve plate, and positioning grooves are provided on the top and bottom of the left and right sides of the baffle, the positioning pin passes through the connecting hole on the side close to the inner cavity of the positioning groove and extends to the inner cavity of the positioning groove, and the surface of the positioning pin is respectively connected to the inner cavity of the connecting hole and the positioning groove by threads, and by setting the connecting holes and the positioning grooves, the connecting holes can enable the positioning pins to quickly dock with the positioning grooves, and after the positioning pins are docked with the positioning grooves at the bottom of both sides of the baffle, the baffle can be fixed at the top, and foreign matter in the inner cavity of the first sieve plate, the second sieve plate and the third sieve plate can be discharged through the openings of the first sieve plate, the second sieve plate and the third sieve plate themselves and the force of vibration.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model arranges a bracket, a first sieve plate, a second sieve plate, a third sieve plate, a cover plate, a feed opening, a connecting mechanism and a transmission mechanism, and starts a vibration motor. The vibration motor transmits vibration through the connecting frame and the transmission plate, thereby achieving the effect of quickly driving the first sieve plate, the second sieve plate and the third sieve plate to perform vibration screening. During the vibration of the first sieve plate, the second sieve plate and the third sieve plate, the feed opening is connected with the feed opening through the feed opening device, so as to achieve the effect of quickly pouring sand into the inner cavity of the feed opening. After the sand enters the inner cavity of the third sieve plate through the feed opening, The third sieve plate will be used for screening through the rapid vibration, and the aperture of the filter holes in the inner cavity of the third sieve plate can be used to intercept large foreign objects, and the sand and small and medium-sized foreign objects can be quickly discharged downward. During the discharge process, the sand and small and medium-sized foreign objects can be stably entered into the inner cavity of the second sieve plate through the cooperation between the guide block at the bottom of the third sieve plate and the second sieve plate. After the sand and small and medium-sized foreign objects enter the inner cavity of the second sieve plate, the second sieve plate will cooperate with the first spring and the filter holes in its own inner cavity to achieve a detailed screening of the sand and small and medium-sized foreign objects. The filter can filter and intercept medium-sized foreign objects, and discharge sand and small foreign objects into the inner cavity of the first sieve plate through the cooperation of the filter holes in its inner cavity and the guide block at the bottom. After being discharged into the inner cavity of the first sieve plate, the sand can be screened and filtered more finely through the aperture of the inner cavity of the first sieve plate that meets the use requirements, and small foreign objects can be intercepted. The sand can be poured into the feed port of the transmission equipment through the guide block at the bottom of the filter. When it is necessary to clean the inside of the first sieve plate, the second sieve plate and the third sieve plate, the positioning pin can be rotated to disengage the positioning pin The inner cavity of the groove, and then pull up the baffle to align the positioning groove at the bottom of the baffle with the positioning pin. After the alignment is completed, rotate the positioning pin in the opposite direction to insert the positioning pin into the inner cavity of the bottom positioning groove, so as to achieve the effect of quickly positioning the baffle. Then, through the cooperation of the first sieve plate, the second sieve plate, the third sieve plate and the transmission mechanism, the foreign matter in the inner cavity of the first sieve plate, the second sieve plate and the third sieve plate can be discharged by vibration, thereby improving the screening effect of sand and soil and the convenience of cleaning the inner cavity of the first sieve plate, the second sieve plate and the third sieve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a three-dimensional structure provided by an embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the combination of the sieve plate, the baffle plate and the positioning pin provided by the embodiment of the utility model in a multi-directional display;

[0016] Figure 3 It is a schematic diagram of the combination of a baffle, a positioning pin and a third filter plate provided by an embodiment of the utility model;

[0017] Figure 4It is a schematic diagram of the plug-in connection between the first sieve plate, the second sieve plate, the third sieve plate and the material guide block provided by the embodiment of the utility model;

[0018] Figure 5 The utility model embodiment provides Figure 3 A partial enlarged view of point A in the middle.

[0019] In the figure: 1. bracket; 2. first sieve plate; 3. second sieve plate; 4. third sieve plate; 5. cover plate; 6. feed port; 7. connecting mechanism; 8. transmission mechanism; 701. arc block; 702. first spring; 703. second spring; 801. transmission plate; 802. vibration motor; 803. connecting frame; 9. filter hole; 10. guide block; 11. baffle; 12. positioning pin; 13. connecting hole; 14. positioning groove. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0021] The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 5As shown, a sand screening device for construction provided by an embodiment of the utility model comprises a bracket 1, a first sieve plate 2, a second sieve plate 3, a third sieve plate 4, a cover plate 5 and a discharge port 6, wherein the first sieve plate 2 is located at the top of the bracket 1, the second sieve plate 3 is located at the top of the first sieve plate 2, the third sieve plate 4 is located at the top of the second sieve plate 3, the cover plate 5 is located at the top of the third sieve plate 4 and is fixedly installed with the top of the third sieve plate 4 by bolts, and the discharge port 6 is located at the top of the cover plate 5 and is fixedly connected with the inner cavity of the cover plate 5; the left and right sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are provided with a connecting mechanism 7; the rear sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are provided with a transmission mechanism 8 used in conjunction with the connecting mechanism 7, and the connecting mechanism 7 comprises an arc block 7 01, the first spring 702 and the second spring 703, the number of arc blocks 701 is multiple and evenly distributed on the left and right sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 and fixedly connected to the surfaces of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4, the number of first springs 702 is multiple and evenly distributed at the opposite ends of the multiple arc blocks 701 and fixedly connected to the surfaces of the arc blocks 701, the number of second springs 703 is multiple and evenly distributed on the left and right sides of the top of the bracket 1, the top of the second spring 703 is fixedly connected to the surface of the bottom arc block 701, by setting the connecting mechanism 7, the multiple arc blocks 701 and the first spring 702 can strengthen the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 The connection effect is improved to avoid the situation where the vibration amplitude between the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 is reduced by welding. The transmission mechanism 8 includes a transmission plate 801, a vibration motor 802 and a connecting frame 803. The connecting frame 803 is located at the front side of the vibration motor 802 and is fixedly connected to the vibration motor 802. The left and right sides of the connecting frame 803 are fixedly installed with the rear side of the transmission plate 801 by bolts. The front side of the transmission plate 801 is fixedly connected with the surfaces of the rear sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4. By setting the transmission mechanism 8, the vibration motor 802 can be quickly installed with the transmission plate 801 through the connecting frame 803, and after installation, the first sieve plate 801 can be quickly driven by the transmission plate 801 The first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 have the effect of vibrating screening. The inner cavities of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are all provided with filter holes 9. The number of filter holes 9 is multiple and evenly distributed in the inner cavities of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4. The aperture of the filter holes 9 in the inner cavity of the second sieve plate 3 is larger than the filter holes 9 in the inner cavity of the first sieve plate 2 and smaller than the filter holes 9 in the inner cavity of the third sieve plate 4. By setting the filter holes 9, the multiple filter holes 9 can achieve the effect of facilitating the user to screen the sand. The filter holes 9 in the inner cavities of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are different in size, which can achieve the effect of quickly distinguishing and screening according to the size of foreign matter, so as to facilitate the user to centrally process foreign matter of different sizes.The bottoms of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are all fixedly connected with guide blocks 10, the guide blocks 10 at the bottom of the third sieve plate 4 are horizontally aligned with the top of the second sieve plate 3, and the guide blocks 10 at the bottom of the second sieve plate 3 are horizontally aligned with the top of the first sieve plate 2. By setting the guide blocks 10, the guide blocks 10 are evenly distributed at the bottoms of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4, so as to achieve the effect of quickly and centrally guiding the sand and soil that have passed through the filter holes 9 to the bottom, thereby avoiding the situation that the sand and soil cannot be stably docked with the bottom sieve plate. The front sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are all movably connected with baffles 11, and the left and right sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are provided with positioning pins 12 used in conjunction with the baffles 11. By setting the baffles 11 and the positioning pins 12, the positioning pins 12 play an effect of facilitating the user to quickly connect and fix the baffles 11 with the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 , so as to achieve the effect of quickly sealing the openings of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4. The left and right sides of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 are provided with connecting holes 13, and the top and bottom of the left and right sides of the baffle plate 11 are provided with positioning grooves 14. The side of the positioning pin 12 close to the inner cavity of the positioning groove 14 passes through the connecting hole 13 and extends to the inner cavity of the positioning groove 14. The surface of the positioning pin 12 is respectively connected to the inner cavity of the connecting hole 13 and the positioning groove 14 by threads. By setting the connecting hole 13 and the positioning groove 14, the connecting hole 13 plays a role in allowing the positioning pin 12 to quickly dock with the positioning groove 14, and after the positioning pin 12 docks with the positioning groove 14 at the bottom of both sides of the baffle plate 11, the baffle plate 11 can be fixed at the top, and the foreign matter in the inner cavity of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 can be discharged through the openings of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 themselves and the force of vibration. ,

[0023] The working principle of this utility model:

[0024] When in use, the vibration motor 802 is started, and the vibration motor 802 transmits vibration through the connecting frame 803 and the transmission plate 801, so as to achieve the effect of quickly driving the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 to vibrate and screen. During the vibration of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4, the material discharge device is connected to the material discharge port 6, so as to achieve the effect of quickly pouring the sand into the inner cavity of the material discharge port 6. After the sand enters the inner cavity of the third sieve plate 4 through the material discharge port 6, it will be screened by the rapid vibration of the third sieve plate 4, and the sand will be screened by the third sieve plate 4. The aperture of the cavity filter hole 9 can achieve the effect of intercepting large foreign objects and quickly discharging sand and small and medium-sized foreign objects downwards. During the discharge process, the sand and small and medium-sized foreign objects will pass through the cooperation between the bottom guide block 10 of the third sieve plate 4 and the second sieve plate 3 to achieve the effect of stably entering the inner cavity of the second sieve plate 3. After the sand and small and medium-sized foreign objects enter the inner cavity of the second sieve plate 3, the second sieve plate 3 will cooperate with the first spring 702 and the inner cavity filter hole 9 to achieve the effect of fine filtering of the sand and small and medium-sized foreign objects, intercepting medium-sized foreign objects, and passing through the filter hole of its own inner cavity. 9 and the bottom guide block 10 cooperate with each other to discharge sand and small foreign objects into the inner cavity of the first sieve plate 2. After being discharged into the inner cavity of the first sieve plate 2, the sand can be screened and filtered more finely through the aperture of the inner cavity of the first sieve plate 2 that meets the use requirements, and small foreign objects can be intercepted. The sand can be poured into the feed port of the transmission equipment through the guide block 10 at the bottom. When it is necessary to clean the inside of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4, the positioning pin 12 can be rotated to disengage the positioning pin 12 from the inner cavity of the positioning groove 14, and then the baffle 11 can be pulled up to make the baffle The positioning groove 14 at the bottom of the plate 11 is aligned with the positioning pin 12. After the alignment is completed, the positioning pin 12 is rotated in the opposite direction to insert the positioning pin 12 into the inner cavity of the bottom positioning groove 14, so as to achieve the effect of quickly positioning the baffle 11. Then, through the mutual cooperation of the first sieve plate 2, the second sieve plate 3, the third sieve plate 4 and the transmission mechanism 8, the foreign matter in the inner cavity of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4 is discharged by vibration, thereby improving the screening effect of sand and soil and the convenience of cleaning the inner cavity of the first sieve plate 2, the second sieve plate 3 and the third sieve plate 4.

[0025] The specific model and specifications of the vibration motor 802 proposed in this application need to be selected and determined based on the actual specifications of the device. The specific selection calculation method, line connection method and control method all adopt the existing technology in this field, so they will not be described in detail.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] The above description is only a preferred embodiment of the utility model, and does not constitute any form of limitation to the utility model. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent will not depart from the scope of the technical solution of the utility model.

Claims

1. A sand screening device for construction, comprising a support (1), a first screen plate (2), a second screen plate (3), a third screen plate (4), a cover plate (5) and a discharge port (6), Features: The first sieve plate (2) is located on the top of the bracket (1), the second sieve plate (3) is located on the top of the first sieve plate (2), the third sieve plate (4) is located on the top of the second sieve plate (3), the cover plate (5) is located on the top of the third sieve plate (4) and is fixedly mounted to the top of the third sieve plate (4) by bolts, and the feed opening (6) is located on the top of the cover plate (5) and is fixedly connected to the inner cavity of the cover plate (5); The first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) are each provided with a connecting mechanism (7) on the left and right sides; A transmission mechanism (8) for use in conjunction with the connection mechanism (7) is provided on the rear sides of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4).

2. A construction sand screening device as claimed in claim 1, Features: The connecting mechanism (7) comprises an arc block (701), a first spring (702) and a second spring (703); the arc blocks (701) are multiple and evenly distributed on the left and right sides of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) and are fixedly connected to the surfaces of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4); the first springs (702) are multiple and evenly distributed at the opposite ends of the multiple arc blocks (701) and are fixedly connected to the surfaces of the arc blocks (701); the second springs (703) are multiple and evenly distributed on the left and right sides of the top of the bracket (1); the top of the second spring (703) is fixedly connected to the surface of the bottom arc block (701).

3. A construction sand screening device as claimed in claim 1, Features: The transmission mechanism (8) comprises a transmission plate (801), a vibration motor (802) and a connecting frame (803); the connecting frame (803) is located at the front side of the vibration motor (802) and is fixedly connected to the vibration motor (802); the left and right sides of the connecting frame (803) are fixedly mounted to the rear side of the transmission plate (801) by bolts; the front side of the transmission plate (801) is fixedly connected to the surfaces of the rear sides of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4).

4. A construction sand screening device as claimed in claim 1, Features: The inner cavities of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) are all provided with filter holes (9); the number of the filter holes (9) is multiple and evenly distributed in the inner cavities of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4); the pore size of the filter holes (9) in the inner cavity of the second sieve plate (3) is larger than the filter holes (9) in the inner cavity of the first sieve plate (2) and smaller than the filter holes (9) in the inner cavity of the third sieve plate (4).

5. A construction sand screening device as claimed in claim 1, Features: The bottoms of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) are all fixedly connected with material guide blocks (10); the material guide block (10) at the bottom of the third sieve plate (4) is horizontally aligned with the top of the second sieve plate (3); and the material guide block (10) at the bottom of the second sieve plate (3) is horizontally aligned with the top of the first sieve plate (2).

6. A construction sand screening device as claimed in claim 1, Features: The front sides of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) are all movably connected to a baffle plate (11), and the left and right sides of the first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) are each provided with a positioning pin (12) for use with the baffle plate (11).

7. A construction sand screening device as claimed in claim 6, Features: The first sieve plate (2), the second sieve plate (3) and the third sieve plate (4) are provided with connecting holes (13) on both sides thereof, and the top and bottom of the left and right sides of the baffle plate (11) are provided with positioning grooves (14), and the side of the positioning pin (12) close to the inner cavity of the positioning groove (14) passes through the connecting hole (13) and extends to the inner cavity of the positioning groove (14), and the surface of the positioning pin (12) is respectively connected to the connecting hole (13) and the inner cavity of the positioning groove (14) by means of threads.

Images