Anti-blocking sand screening device for house building construction

Abstract

The utility model relates to the field of building construction devices, in particular to an anti-blocking sand screening device for house building construction, and aims to solve the technical problems that a worker needs to manually dredge blocked screen holes by using a tool, so that the working efficiency of sand screening is reduced. According to the technical scheme, the anti-blocking sand screening device for house building construction comprises a bottom plate, supporting legs, a separation box, a first material guiding frame, a second material guiding frame, a feeding pipe, a discharging pipe, a rotating assembly and a screening and cleaning assembly; through the combined operation of the rotating assembly and the screening and cleaning assembly, not only can the screen be accurately controlled to rotate uniformly and quickly, so that impurities in sand can be effectively separated, but also residues on the screen can be cleaned in all directions, the smoothness of the screen is ensured, and the screening and cleaning efficiency is improved. By means of the combined operation mode, the burden of manual cleaning is relieved, and the screening quality and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the field of building construction devices, in particular to an anti-clogging sand screening device for building construction. Background Art

[0002] The sand screening device for building construction is mainly used to screen the sand and remove stones, impurities, etc. to obtain sand materials that meet the construction requirements, thereby improving construction efficiency and reducing construction costs. Therefore, the widespread use of sand screening devices in construction is of great significance.

[0003] During the use of existing sand screening devices, sand and gravel are easy to clog the sieve holes of the sieve plate. Faced with this situation, the usual practice is to shut down the machine and then workers need to manually use tools to clear the clogged sieve holes, which is time-consuming and laborious, and will also cause certain interference and delays to the normal progress of the sand screening work.

[0004] Therefore, in view of the above-mentioned situation that workers need to manually use tools to clear the clogged sieve holes, thereby reducing the efficiency of sand screening, an anti-clogging sand screening device for building construction can be designed. Through the gear transmission structure and the belt transmission structure, the sieve can be automatically cleaned while screening the sand, thereby preventing the sieve holes from being blocked by sand and gravel. Utility Model Content

[0005] In order to overcome the problem that workers need to manually use tools to unclog the clogged sieve holes, thereby reducing the efficiency of sand screening.

[0006] The technical scheme of the utility model is: a kind of anti-clogging sand screening device for building construction, comprising a base plate, a support leg, a separation box, a first material introduction frame, a second material introduction frame, a feed pipe, a discharge pipe, a rotating assembly and a screening and cleaning assembly; the lower end of the base plate is fixedly connected with a support leg for support, the upper end of the base plate is installed with a separation box, a partition is fixedly connected in the separation box, the partition and the separation box enclose an upper and lower cavity, a baffle is fixedly connected to the upper end of the partition, the first material introduction frame is installed in the upper cavity and is located at the upper end of the sieve plate in the screening and cleaning assembly, the second material introduction frame is installed in the upper cavity and is located at the lower end of the sieve plate in the screening and cleaning assembly, the feed pipe is installed at the rear end of the separation box, the discharge pipe is installed at the left and right ends of the separation box, a gear transmission structure is provided in the rotating assembly and is driven to rotate by a motor, the rotating assembly is installed in the lower cavity, a belt transmission structure is provided in the screening and cleaning assembly and is installed in the upper cavity, and the power output structure in the screening and cleaning assembly is installed at the upper end of the separation box.

[0007] Preferably, the bottom plate is the basic part of the entire sand screening device, providing a stable working platform, the legs are used to support the entire device, the separation box is the main part of the sand screening device, and its interior is divided into two upper and lower cavities by a partition, thereby forming two independent spaces, which are respectively used for sand screening and the installation of rotating components. The No. 1 material guide frame is used to guide the sand and gravel to be screened onto the screen plate, and the function of the No. 2 material guide frame is to collect the sand and gravel that have been screened by the screen plate. The rotating component is the part of the entire sand screening device responsible for driving the screen plate to rotate, and it realizes uniform and stable rotation of the screen plate through the servo motor and gear transmission structure to achieve the purpose of screening sand and gravel, thereby improving the screening effect, and the screening cleaning component is used to clean the residual sand and gravel on the screen during or after the screening to ensure the smooth flow of the screen.

[0008] Preferably, the rotating assembly includes a No. 1 servo motor, a No. 1 coupling, a rotating support seat and a rotating shaft; the No. 1 servo motor is installed in the lower cavity surrounded by the partition and the separation box, there are three rotating support seats and they are installed in parallel on the left and right sides at the bottom of the lower cavity, the upper end of the rotating shaft is installed with a No. 1 coupling and is connected to the output shaft of the No. 1 servo motor through the No. 1 coupling, the lower end of the rotating shaft is rotatably connected to the middle rotating support seat, the No. 1 servo motor is the power source of the entire rotating assembly, the No. 1 servo motor has the ability to accurately control the speed, and can ensure the stable rotation of the screen plate, the No. 1 coupling is connected between the output shaft of the No. 1 servo motor and the rotating shaft, and is used to transmit the rotational power of the motor to the rotating shaft, the rotating support seat provides stable support for the rotating shaft and the support shaft, and allows them to rotate, the rotational motion of the rotating shaft is transmitted to the support shaft through the gear transmission structure, thereby driving the screen plate to rotate.

[0009] Preferably, the rotating assembly includes a No. 1 support shaft, a No. 2 support shaft and a screen plate; the lower end of the No. 1 support shaft is rotatably connected to the rotating support seat on the left, and the lower end of the No. 2 support shaft is rotatably connected to the rotating support seat on the right, and the upper ends of the two support shafts extend upward to the upper cavity enclosed by the partition and the separation box, and the upper ends of the two support shafts are fixedly connected to the screen plate, and a screen is arranged in the screen plate. The function of the No. 1 support shaft and the No. 2 support shaft is to support the screen plate and transmit the rotational motion of the rotating shaft to the screen plate. The screen plate is a component in the sand screening device for screening sand and gravel, and a screen is arranged in the screen plate. When sand and gravel pass over the screen, sand particles smaller than the aperture of the screen will pass through the screen, while larger stones will remain above the screen.

[0010] Preferably, the rotating assembly also includes gear No. 1, gear No. 2 and gear No. 3; gear No. 1 is fixedly connected to the outer wall of the rotating shaft, gear No. 2 is fixedly connected to the outer wall of the No. 1 support shaft, gear No. 3 is fixedly connected to the outer wall of the No. 2 support shaft, gear No. 1 is meshingly connected to gear No. 2, gear No. 1 is meshingly connected to gear No. 3, gear No. 1, gear No. 2 and gear No. 3 constitute the gear transmission structure of the rotating assembly, when servo motor No. 1 drives the rotating shaft to rotate, gear No. 1 will drive gear No. 2 and gear No. 3 to rotate synchronously, thereby realizing the synchronous rotation of support shaft No. 1 and support shaft No. 2, thereby driving the screen plate to rotate.

[0011] Preferably, the screening and cleaning assembly includes a No. 2 servo motor, a No. 2 coupling, a No. 1 sleeve and a No. 2 sleeve; the No. 2 servo motor is installed at the upper end of the separation box, the No. 2 coupling is installed at the upper end of the No. 1 sleeve and is connected to the output shaft of the No. 2 servo motor through the No. 2 coupling, the lower end of the No. 1 sleeve is rotatably connected to the upper end of the No. 1 support shaft, the lower end of the No. 2 sleeve is rotatably connected to the upper end of the No. 2 support shaft, and the upper end of the No. 2 sleeve extends upward to the upper end of the separation box. The No. 2 servo motor provides power for the screening and cleaning assembly, and the screen cleaning speed and force can be adjusted by precisely controlling the rotation speed of the No. 2 servo motor. The No. 2 coupling is connected between the output shaft of the No. 2 servo motor and the No. 1 sleeve, and is used to transmit the rotational power of the motor to the No. 1 sleeve. The No. 1 sleeve and the No. 2 sleeve are key components of the screening and cleaning assembly, which not only connect the servo motor and the support shaft, but also carry cleaning tools such as cross bars and brushes.

[0012] Preferably, the screening and cleaning assembly includes a cross bar and a brush; the cross bar is fixedly connected to the outer walls of the No. 1 sleeve and the No. 2 sleeve and is distributed in a circle, and a brush for cleaning the mesh of the screen is installed at the lower end of the cross bar. The cross bar is distributed in a circle. Such a design can ensure that the brush can cover the entire area of ​​the screen when rotating for all-round cleaning. The material of the brush is a soft but tough material, such as nylon or polyester fiber, to ensure that the screen will not be damaged during the cleaning process.

[0013] Preferably, the screening and cleaning assembly also includes a driving wheel, a driven wheel and a belt; the driving wheel is fixedly connected to the outer wall of the No. 1 sleeve, the driven wheel is fixedly connected to the outer wall of the No. 2 sleeve, the driving wheel and the driven wheel rotate together and are connected with a belt, the driving wheel, the driven wheel and the belt form a closed belt transmission system, when the No. 1 sleeve is driven by the No. 2 servo motor to rotate, the driving wheel will drive the belt and the driven wheel to rotate synchronously, thereby realizing the rotation of the No. 2 sleeve. This design can ensure the synchronous rotation of the No. 1 sleeve and the No. 2 sleeve, and ensure that the cross bar and the brush can evenly cover the screen during the cleaning process.

[0014] Beneficial effects of the utility model:

[0015] 1. Through the joint operation of the rotating component and the screening and cleaning component, not only can the screen be accurately controlled to rotate evenly and quickly, thereby effectively separating impurities in the sand, but also the residues on the screen can be cleaned in all directions, ensuring the unobstructed operation of the screen. This joint operation mode not only reduces the burden of manual cleaning, but also improves the quality and efficiency of screening;

[0016] 2. The driving wheel, driven wheel and belt form a closed belt drive system. This design can ensure that the No. 1 sleeve and the No. 2 sleeve rotate synchronously, ensuring that the cross bar and the brush can evenly cover the screen during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a first three-dimensional structural schematic diagram of the anti-clogging sand screening device for building construction of the utility model;

[0018] Figure 2 Shown is a second three-dimensional structural schematic diagram of the anti-clogging sand screening device for building construction of the utility model;

[0019] Figure 3 Shown is a front view schematic diagram of an anti-clogging sand screening device for building construction of the utility model;

[0020] Figure 4 Shown is a top view schematic diagram of an anti-clogging sand screening device for building construction of the utility model;

[0021] Figure 5 Shown is a schematic diagram of the three-dimensional structure of the rotating assembly of the anti-clogging sand screening device for building construction of the utility model;

[0022] Figure 6 Shown is a three-dimensional structural schematic diagram of the screening and cleaning components of the anti-clogging sand screening device for building construction of the present invention.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. bottom plate; 2. supporting feet; 3. separation box; 4. feed frame No. 1; 5. feed frame No. 2; 6. feed pipe; 7. discharge pipe; 801. servo motor No. 1; 802. coupling No. 1; 803. rotating support seat; 804. rotating shaft; 805. supporting shaft No. 1; 806. supporting shaft No. 2; 807. sieve plate; 808. gear No. 1; 809. gear No. 2; 810. gear No. 3; 901. servo motor No. 2; 902. coupling No. 2; 903. sleeve No. 1; 904. sleeve No. 2; 905. cross bar; 906. brush; 907. driving wheel; 908. driven wheel; 909. belt. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-Figure 4 The utility model provides an embodiment: a sand screening device for anti-clogging building construction, comprising a bottom plate 1, a support leg 2, a separation box 3, a first material guide frame 4, a second material guide frame 5, a feed pipe 6, a discharge pipe 7, a rotating assembly and a screening and cleaning assembly; the lower end of the bottom plate 1 is fixedly connected with a support leg 2 for support, the upper end of the bottom plate 1 is installed with a separation box 3, a partition is fixedly connected in the separation box 3, the partition and the separation box 3 enclose an upper and lower cavity, and the upper end of the partition is fixedly connected There is a baffle, the first feed frame 4 is installed in the upper cavity and located at the upper end of the sieve plate 807 in the screening and cleaning component, the second feed frame 5 is installed in the upper cavity and located at the lower end of the sieve plate 807 in the screening and cleaning component, the feed pipe 6 is installed at the rear end of the separation box 3, the discharge pipe 7 is installed at the left and right ends of the separation box 3, the rotating component is provided with a gear transmission structure and is driven to rotate by a motor, the rotating component is installed in the lower cavity, and the screening and cleaning component is provided with a belt 909 transmission structure. The moving structure is installed in the upper cavity, the power output structure in the screening and cleaning assembly is installed at the upper end of the separation box 3, the bottom plate 1 is the basic part of the entire sand screening device, providing a stable working platform, the support leg 2 is used to support the entire device, the separation box 3 is the main part of the sand screening device, and its interior is divided into upper and lower cavities by a partition, thereby forming two independent spaces, which are respectively used for sand screening and the installation of the rotating assembly, the No. 1 material guide frame 4 is used to guide the sand and gravel to be screened to the screen plate 807, and the No. 2 material guide frame 5 is used to collect the sand and gravel that have been screened by the screen plate 807. The rotating assembly is the part of the entire sand screening device responsible for driving the screen plate 807 to rotate, it realizes the uniform and stable rotation of the screen plate 807 through the servo motor and the gear transmission structure, so as to achieve the purpose of screening sand and gravel, thereby improving the screening effect, and a belt 909 transmission structure is provided in the screening and cleaning assembly for cleaning the screen to prevent the holes of the screen from being blocked.

[0026] See also Figure 5In this embodiment, the rotating assembly includes a servo motor No. 801, a coupling No. 802, a rotating support seat 803 and a rotating shaft 804; the servo motor No. 801 is installed in the lower cavity surrounded by the partition and the separation box 3, and there are three rotating support seats 803 and they are installed in parallel on the bottom of the lower cavity. The upper end of the rotating shaft 804 is installed with a coupling No. 802 and is connected to the output shaft of the servo motor No. 801 through the coupling No. 802. The lower end of the rotating shaft 804 is rotatably connected to the rotating support seat 803 in the middle. The rotating assembly also includes a support shaft No. 805, a support shaft No. 2 806 and a screen plate 807; the lower end of the support shaft No. 805 is rotatably connected to the left side. The lower end of the No. 2 support shaft 806 is rotatably connected to the right side of the rotating support seat 803, and the upper ends of the two support shafts extend upward to the upper cavity surrounded by the partition and the separation box 3. The upper ends of the two support shafts are fixedly connected to the sieve plate 807, and the sieve plate 807 is provided with a sieve. The rotating assembly also includes a No. 1 gear 808, a No. 2 gear 809 and a No. 3 gear 810; the No. 1 gear 808 is fixedly connected to the outer wall of the rotating shaft 804, the No. 2 gear 809 is fixedly connected to the outer wall of the No. 1 support shaft 805, the No. 3 gear 810 is fixedly connected to the outer wall of the No. 2 support shaft 806, the No. 1 gear 808 is meshedly connected to the No. 2 gear 809, and the No. 1 gear 80 8 is meshed and connected to the third gear 810. The first servo motor 801 is the power source of the entire rotating assembly. The first servo motor 801 has the ability to accurately control the speed and can ensure the stable rotation of the sieve plate 807. The first coupling 802 is connected between the output shaft of the first servo motor 801 and the rotating shaft 804, and is used to transmit the rotational power of the motor to the rotating shaft 804. The rotating support seat 803 provides stable support for the rotating shaft 804 and the support shaft, and allows them to rotate. The rotational movement of the rotating shaft 804 is transmitted to the support shaft through the gear transmission structure, thereby driving the sieve plate 807 to rotate. The function of the first support shaft 805 and the second support shaft 806 is to support the sieve plate 80 7, and transmits the rotational motion of the rotating shaft 804 to the screen plate 807. The screen plate 807 is a component in the sand screening device for screening sand and gravel. A screen is arranged inside the screen plate 807. When sand and gravel pass over the screen, sand particles smaller than the aperture of the screen will pass through the screen, while larger stones will remain above the screen. The No. 1 gear 808, the No. 2 gear 809 and the No. 3 gear 810 constitute the gear transmission structure of the rotating component. When the No. 1 servo motor 801 drives the rotating shaft 804 to rotate, the No. 1 gear 808 will drive the No. 2 gear 809 and the No. 3 gear 810 to rotate synchronously, thereby realizing the synchronous rotation of the No. 1 support shaft 805 and the No. 2 support shaft 806, thereby driving the screen plate 807 to rotate.

[0027] See also Figure 6In this embodiment, the screening and cleaning assembly includes a No. 2 servo motor 901, a No. 2 coupling 902, a No. 1 sleeve 903 and a No. 2 sleeve 904; the No. 2 servo motor 901 is installed at the upper end of the separation box 3, the No. 1 sleeve 903 is installed with the No. 2 coupling 902 on the upper end and is connected to the output shaft of the No. 2 servo motor 901 through the No. 2 coupling 902, the No. 1 sleeve 903 is rotatably connected to the upper end of the No. 1 support shaft 805, the No. 2 sleeve 904 is rotatably connected to the upper end of the No. 2 support shaft 806, the No. 2 sleeve 904 The upper end extends upward to the upper end of the separation box 3, the screening and cleaning assembly The components further include a cross bar 905 and a brush 906; the cross bar 905 is respectively fixedly connected to the outer walls of the No. 1 sleeve 903 and the No. 2 sleeve 904 and is distributed in a circumference, and a brush 906 for cleaning the mesh of the screen is installed at the lower end of the cross bar 905. The screening cleaning component also includes a driving wheel 907, a driven wheel 908 and a belt 909; the driving wheel 907 is fixedly connected to the outer wall of the No. 1 sleeve 903, and the driven wheel 908 is fixedly connected to the outer wall of the No. 2 sleeve 904. The driving wheel 907 and the driven wheel 908 rotate together and are connected to the belt 909. The No. 2 servo motor 901 provides power for the screening cleaning component. By controlling the rotation speed of the second servo motor 901, the cleaning speed and strength of the screen can be adjusted. The second coupling 902 is connected between the output shaft of the second servo motor 901 and the first sleeve 903, and is used to transmit the rotational power of the motor to the first sleeve 903. The first sleeve 903 and the second sleeve 904 are key components of the screening and cleaning assembly, which not only connect the servo motor and the support shaft, but also carry cleaning tools such as the cross bar 905 and the brush 906. The cross bar 905 is distributed in a circle. This design ensures that the brush 906 can cover the entire area of ​​the screen when rotating, and perform all-round cleaning. The material of the brush 906 is a soft but tough material, such as nylon or polyester fiber, to ensure that the screen will not be damaged during the cleaning process. The driving wheel 907, the driven wheel 908 and the belt 909 form a closed belt 909 transmission system. When the No. 1 sleeve 903 is driven by the No. 2 servo motor 901 to rotate, the driving wheel 907 will drive the belt 909 and the driven wheel 908 to rotate synchronously, thereby realizing the rotation of the No. 2 sleeve 904. This design can ensure that the No. 1 sleeve 903 and the No. 2 sleeve 904 rotate synchronously, and ensure that the cross bar 905 and the brush 906 can evenly cover the screen during the cleaning process.

[0028] In the working process, the worker smoothly adds sand into the separation box 3 through the feeding pipe 6. At this time, the No. 1 servo motor 801 and the No. 2 servo motor 901 are started at the same time. After the No. 1 servo motor 801 is started, the driving shaft 804 starts to rotate, thereby driving the No. 1 gear 808 connected thereto to rotate. As the No. 1 gear 808 rotates, it meshes with the No. 2 gear 809 and the No. 3 gear 810 to achieve power transmission, prompting the No. 1 support shaft 805 and the No. 2 support shaft 806 to rotate accordingly. This action causes the two screen plates 807 to start to rotate synchronously to screen the sand.

[0029] At the same time, the second servo motor 901 starts to drive the first sleeve 903 to start rotating. Through the transmission mechanism of the belt 909, the second sleeve 904 also rotates, thereby driving the brush 906 fixed on the horizontal plate to rotate together. This rotation action effectively cleans the residue on the screen, ensuring that the holes of the screen are not blocked by impurities, and maintaining the efficiency and effect of screening;

[0030] Finally, the sieved sand flows out smoothly through the discharge pipes 7 at the left and right ends of the separation box 3, completing the entire sieving and cleaning process.

[0031] Through the above steps, through the joint operation of the rotating component and the screening and cleaning component, not only can the screen be precisely controlled to rotate evenly and quickly, thereby effectively separating impurities in the sand, but also the residues on the screen can be cleaned in all directions to ensure that the screen is unobstructed. This joint operation mode not only reduces the burden of manual cleaning, but also improves the quality and efficiency of screening, and solves the problem that workers need to manually use tools to dredge blocked screen holes, thereby reducing the efficiency of sand screening.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A clogging-proof sand screening device for building construction, comprising a bottom plate (1), a support leg (2), a separation box (3), a first feed frame (4), a second feed frame (5), a feed pipe (6) and a discharge pipe (7); characterized in that: The invention also comprises a rotating assembly and a screening and cleaning assembly; a support leg (2) for supporting is fixedly connected to the lower end of the bottom plate (1); a separation box (3) is installed on the upper end of the bottom plate (1); a partition is fixedly connected inside the separation box (3); the partition and the separation box (3) enclose an upper and lower cavity; a baffle is fixedly connected to the upper end of the partition; a first feed frame (4) is installed in the upper cavity and is located on the upper end of the sieve plate (807) in the screening and cleaning assembly; a second feed frame (5) is installed on the upper cavity; The lower end of the sieve plate (807) in the screening and cleaning component is located in the cavity, the feed pipe (6) is installed at the rear end of the separation box (3), the discharge pipe (7) is installed at the left and right ends of the separation box (3), a gear transmission structure is provided in the rotating component and is driven to rotate by a motor, the rotating component is installed in the lower cavity, a belt (909) transmission structure is provided in the screening and cleaning component and is installed in the upper cavity, and the power output structure in the screening and cleaning component is installed at the upper end of the separation box (3).

2. The anti-clogging sand screening device for building construction according to claim 1 is characterized in that: The rotating assembly comprises a No. 1 servo motor (801), a No. 1 coupling (802), a rotating support seat (803) and a rotating shaft (804); the No. 1 servo motor (801) is installed in a lower cavity surrounded by a partition and a separation box (3); three rotating support seats (803) are installed in parallel on the bottom of the lower cavity; the No. 1 coupling (802) is installed on the upper end of the rotating shaft (804) and is connected to the output shaft of the No. 1 servo motor (801) through the No. 1 coupling (802); and the lower end of the rotating shaft (804) is rotatably connected to the rotating support seat (803) in the middle.

3. The anti-clogging sand screening device for building construction according to claim 2 is characterized in that: The rotating assembly further comprises a No. 1 support shaft (805), a No. 2 support shaft (806) and a sieve plate (807); the lower end of the No. 1 support shaft (805) is rotatably connected to the rotating support seat (803) on the left, and the lower end of the No. 2 support shaft (806) is rotatably connected to the rotating support seat (803) on the right; the upper ends of the two support shafts extend upward to the upper cavity enclosed by the partition plate and the separation box (3); the upper ends of the two support shafts are fixedly connected to the sieve plate (807), and a sieve is arranged in the sieve plate (807).

4. The anti-clogging sand screening device for building construction according to claim 3 is characterized by: The rotating assembly further comprises a first gear (808), a second gear (809) and a third gear (810); the first gear (808) is fixedly connected to the outer wall of the rotating shaft (804), the second gear (809) is fixedly connected to the outer wall of the first supporting shaft (805), the third gear (810) is fixedly connected to the outer wall of the second supporting shaft (806), the first gear (808) is meshedly connected to the second gear (809), and the first gear (808) is meshedly connected to the third gear (810).

5. The anti-clogging sand screening device for building construction according to claim 3 is characterized by: The screening and cleaning component comprises a No. 2 servo motor (901), a No. 2 coupling (902), a No. 1 sleeve (903) and a No. 2 sleeve (904); the No. 2 servo motor (901) is mounted on the upper end of the separation box (3); the No. 2 coupling (902) is mounted on the upper end of the No. 1 sleeve (903) and is connected to the output shaft of the No. 2 servo motor (901) via the No. 2 coupling (902); the lower end of the No. 1 sleeve (903) is rotatably connected to the upper end of the No. 1 support shaft (805); the lower end of the No. 2 sleeve (904) is rotatably connected to the upper end of the No. 2 support shaft (806); and the upper end of the No. 2 sleeve (904) extends upward to the upper end of the separation box (3).

6. The anti-clogging sand screening device for building construction according to claim 5 is characterized in that: The screening and cleaning assembly further comprises a cross bar (905) and a brush (906); the cross bar (905) is respectively fixedly connected to the outer walls of the first sleeve (903) and the second sleeve (904) and is distributed in a circumference, and a brush (906) for cleaning the mesh of the screen is installed at the lower end of the cross bar (905).

7. The anti-clogging sand screening device for building construction according to claim 6 is characterized by: The screening and cleaning assembly further comprises a driving wheel (907), a driven wheel (908) and a belt (909); the driving wheel (907) is fixedly connected to the outer wall of the first sleeve (903), the driven wheel (908) is fixedly connected to the outer wall of the second sleeve (904), and the driving wheel (907) and the driven wheel (908) are connected to the belt (909) so as to rotate together.

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