Adjustable material screening device for building construction

Abstract

The application discloses a building construction material screening device, which belongs to the technical field of building construction material screening and comprises a screen frame, a screen is arranged in the screen frame and used for screening sand and stones, a movable screen is arranged at the front end of the screen, a movable support table used for supporting the screen frame is arranged at the lower end of the screen frame, and shells are arranged at the left and right ends of the movable support table.

Description

Technical Field

[0001] This invention relates to the field of screening technology for construction materials, specifically an adjustable screening device for construction materials. Background Technology

[0002] Currently, sand screening in construction projects is done manually using traditional methods. Workers tilt the screen and pour the sand onto it. The sand and gravel are separated by the screen's resistance. However, as time goes on, workers become fatigued, and their screening strength gradually decreases, significantly affecting the screening speed and quality. The sand and gravel cannot be screened in one go, and unscreened sand accumulates at the front of the screen, causing the screening area to decrease continuously, reducing the screening speed, and thus affecting work efficiency.

[0003] Therefore, to address the above problems, we need a screening device that can completely separate stones and sand in one go to solve these issues. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable material screening device for building construction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable construction material screening device, comprising a screen frame, wherein a screen for screening sand and gravel is connected inside the screen frame, a movable screen is provided at the front end of the screen, a movable support platform is provided at the lower end of the screen frame for supporting the screen frame, outer shells are provided at the left and right ends of the movable support platform, a propulsion mechanism air pump is provided above the outer shells, the air pump is used to push the movable support platform forward or backward, a rotating mechanism is provided at the bottom end of the movable support platform, a rotating shaft is provided at the bottom end of the movable support platform for the screen frame to rotate upward or downward, and support rods, support columns, and grooves are provided on the left and right sides of the front bottom end of the movable support platform for limiting the upward or downward range of the screen frame when it rises or falls. The outer casing is equipped with a telescopic rod at the top for driving the screen frame to rise or fall. The screen frame is initially tilted at a large angle. A rotating mechanism is used to drive the screen frame to rotate and rise vertically. The screen frame is equipped with a lifting mechanism on both sides for moving the movable screen. The lifting mechanism includes a motor. The motor shaft is fixedly connected to a first fixed shaft. The first fixed shaft drives a third drag chain to rotate. The third drag chain drives a fourth fixed shaft to rotate. The front ends of the screen frame are equipped with fifth fixed shafts on both sides. The fifth fixed shaft is rotatably mounted on the top sides of the screen frame. The fifth fixed shaft drives a second drag chain to rise. The second drag chain drives the fifth fixed shaft to rotate. The movable screen is connected to the second drag chain via a first fixed rod.

[0006] As a further embodiment of the present invention, a propulsion mechanism is provided on the upper part of the outer shell for pushing the movable support platform forward or backward with an air pump. The front end of the air pump is provided with a first air pump telescopic rod and a second air pump telescopic rod for pushing the movable support platform forward or backward. The second air pump telescopic rod is connected to both sides of the movable support platform. The upper surface of the outer shell is provided with an upward-opening outer shell groove. Inside the outer shell groove is a protruding block. A cylinder is provided at the bottom of the protruding block. The cylinder penetrates the bottom of the protruding block. There is a gap between the cylinder and the protruding block. The cylinder can rotate inside the protruding block. A second fixing rod is provided on the outer wall of the cylinder for moving the protruding block forward. The telescopic rod is provided at the front end of the protruding block. The protruding block is pushed by the second fixing rod, and the telescopic rod is pushed by the protruding block.

[0007] As a further embodiment of the present invention, the telescopic rod is connected to the screen frame and the protruding block, and the telescopic rod is used to tilt the screen frame.

[0008] As a further embodiment of the present invention, the front end of the outer shell is provided with a support platform for the moving support platform to move forward, the top end of the support platform is provided with an open support platform groove for the moving support platform to move forward, the rear end of the support platform groove is provided with a slider, the slider is connected to the moving support platform to drive the moving support platform to move forward, and the front end of the support platform is provided with a baffle for limiting the moving distance of the moving support platform.

[0009] As a further embodiment of the present invention, the lifting mechanism includes an elastic protrusion provided on the inner surface of the second drag chain, the first fixing rod is fixed on the movable screen, the protrusion drives the first fixing rod to rise by friction, and when it rises to the top, it is blocked by the fifth fixing shaft, and the deformation of the protrusion passes through the first fixing rod.

[0010] As a further embodiment of the present invention, a buffer device is provided at the bottom of the first fixing rod.

[0011] As a further embodiment of the present invention, a material conveying mechanism is provided between the two outer shells. The material conveying mechanism includes a material conveying cart for storing sieved sand. The bottom of the material conveying cart is provided with rollers for movement. The bottom of the material conveying cart is provided with a material conveying cart groove. A fixed rod for dragging the material conveying cart is provided in the groove. The fixed rod passes through the bottom of the material conveying cart groove. The connecting post of the fixed rod is connected to the third fixed rod. The rear end of the material conveying cart is provided with two symmetrical handles.

[0012] As a further embodiment of the present invention, the front end of the screen frame is provided with multiple sensors, which are used to sense when sand and gravel are about to approach and the screen frame starts to operate.

[0013] As a further embodiment of the present invention, the front end of the screen frame is provided with multiple sensors, which are used to sense when sand and gravel are about to approach and the material screening device starts to operate.

[0014] As a further embodiment of the present invention, a first telescopic plate and a second telescopic plate are provided above the support platform for the stones to roll off, and the first telescopic plate and the second telescopic plate expand and contract according to the inclination of the screen frame.

[0015] As a further embodiment of the present invention, a transmission mechanism is provided inside the outer casing. A second fixed shaft and a third fixed shaft are provided at the front and rear ends of the outer casing and fixed inside the outer casing, respectively. The first fixed shaft drives the second fixed shaft to rotate. A drag chain provided at the front end of the second fixed shaft drives the third fixed shaft to rotate. A second fixed rod and a third fixed rod are provided between the second fixed shaft and the third fixed shaft. The second fixed rod and the third fixed rod are fixed rods that move between the second fixed shaft and the third fixed shaft.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention utilizes a rotating mechanism, an lifting mechanism, and a propulsion mechanism to screen sand and gravel. The lifting mechanism carries the sand and gravel upwards, while the propulsion mechanism pushes the moving support platform forward with impact and inertia. The rotating mechanism then allows workers to easily sift the sand and gravel onto the movable screen. This three-fold method saves workers' labor while enabling the material screening device to screen in one go.

[0018] 2. This invention uses a propulsion mechanism to rapidly move the screen frame and the movable support platform forward. This allows the screen frame to quickly move forward and make contact with the sand and gravel just before they are about to come into contact with it. By using the impact force and inertia brought by the propulsion mechanism, the invention achieves both labor-saving operation for workers and better screening of sand and gravel.

[0019] 3. The No. 3 fixing rod of this invention moves forward and backward, and when it drives the material transport vehicle forward, it can collect the remaining small amount of rolling sand. In the initial state, when stationary, it can collect most of the sand that has been screened from a high place. Then, by having the workers tilt the front end of the material transport vehicle, the problem of sand accumulating at the bottom of the traditional screen is solved, and all the sand can be collected in the material transport vehicle. Furthermore, by tilting the front end of the material transport vehicle, it is disengaged from the groove of the material transport vehicle, allowing the material transport vehicle to transport materials normally. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a diagram of the shaft and chain of the present invention;

[0022] Figure 3 This is a diagram of the material handling mechanism of the present invention;

[0023] Figure 4 For the present invention Figure 1 Amplification portion;

[0024] Figure 5 For the present invention Figure 2 Amplification portion;

[0025] Figure 6 This is a schematic diagram of the front structure of the present invention;

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the cross-sectional structure along AA;

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Screen frame, 101. Rotating shaft, 102. Support rod, 103. Support column, 104. Groove, 105. Air pump, 106. No. 1 air pump telescopic rod, 107. No. 2 air pump telescopic rod, 108. Movable support platform, 108. Screen, 12. Movable screen, 13. Sensor, 14. No. 1 telescopic plate, 16. No. 2 telescopic plate, 17. Outer shell, 21. Motor, 21. Telescopic rod, 2101. Outer shell groove, 2104. Support platform, 22. Support platform groove, 23. 201, slider; 2202, baffle; 2203, fixed shaft 1; 23, fixed shaft 2; 24, fixed shaft 3; 2401, drag chain 1; 2402, fixed rod 3; 2403, fixed shaft 4; 25, fixed shaft 5; 2501, drag chain 2; 2502, drag chain 3; 2503, fixed rod 1; 26, fixed rod 2; 27, material transport vehicle; 3, handle; 31, roller; 32, connecting column; 33, fixed rod; 34. Detailed Implementation

[0029] Please see Figures 1-7This invention provides a technical solution: an adjustable construction material screening device, comprising a screen frame 1, characterized in that: a screen 12 for screening sand and gravel is connected inside the screen frame 1, a movable screen 13 is provided at the front end of the screen 12, a movable support platform 108 for supporting the screen frame 1 is provided at the lower end of the screen frame 1, and outer shells 2 are provided at the left and right ends of the movable support platform 108. A propulsion mechanism air pump 105 is provided above the outer shells 2, the air pump 105 is used to push the movable support platform 108 forward or backward, a rotating mechanism is provided at the bottom end of the movable support platform 108, and a rotating shaft 101 for the screen frame 1 to rotate upward or downward at the bottom end of the movable support platform 108. Support rods 102, support columns 103, and grooves 104 are provided on the left and right sides of the front bottom end of the movable support platform 108 to limit the upward or downward range of the screen frame 1 when it rises or falls. A telescopic rod 2101 is provided at the top to drive the screen frame 1 to rise or fall. The original state of the screen frame 1 is a large tilt. The rotating mechanism is used to drive the screen frame 1 to rotate and rise in the vertical direction. The screen frame 1 is provided with a lifting mechanism on both sides to drive the movable screen 13 to move. The lifting mechanism includes a motor 21. The motor shaft of the motor 21 is fixedly connected to a first fixed shaft 23. The first fixed shaft 23 drives the third drag chain 2503 to rotate. The third drag chain 2503 drives the fourth fixed shaft 25 to rotate. The front end of the screen frame 1 is provided with a fifth fixed shaft 2501 on both sides. The fifth fixed shaft 2501 is rotatably installed on the top two sides of the screen frame 1. The fifth fixed shaft 2501 drives the second drag chain 2502 to rise. The second drag chain 2502 drives the fifth fixed shaft 2501 to rotate. The movable screen 13 is connected to the second drag chain 2502 through the first fixed rod 26.

[0030] During operation, workers sieve sand and gravel onto the inclined movable screen 13. At this time, the rotating mechanism starts to operate, and the screen frame 1 tilts forward under the push of the telescopic rod 2101. The bottom of the movable support platform 108 is equipped with a rotating shaft 101 to help the telescopic rod 2101 rotate, and the front bottom is equipped with a support column 103 to control the tilt of the screen frame 1, maintaining the sieving amplitude when supported. At the same time, the lifting mechanism starts to operate, and the motor 21 drives the first fixed shaft 23 to rotate. The first fixed shaft 23 drives the third drag chain 2503 to make the fourth fixed shaft 25 rotate as well. The rotation of the fourth fixed shaft 25 drives the second drag chain 25. 02. The first fixed rod 26, driven by the second drag chain 2502, begins to rise. When it reaches the fifth fixed shaft 2501, it is blocked and stops rising. At this time, the sand and gravel are carried to the top by the movable screen 13. The sand that has not been properly screened slides down from the top. The rotating mechanism and the lifting mechanism operate at the same time as the propulsion mechanism. The air pump 105 pushes the movable support platform 108 forward. The impact force of the air pump 105 pushing the movable support platform 108 makes the screen frame 1 contact the sand and gravel before the sand and gravel even touch the screen frame 1. The sand and gravel are screened by the impact force inertia, which also saves labor for the workers.

[0031] Thus, the present invention uses three methods to screen sand and gravel: a rotating mechanism, an lifting mechanism, and a pushing mechanism. The lifting mechanism carries the sand and gravel to the top, while the pushing mechanism pushes the movable support platform 108 forward with impact and inertia. The rotating mechanism then allows workers to easily screen the sand and gravel onto the movable screen 13. This method saves workers' labor while enabling the material screening device to screen in one go.

[0032] As a further embodiment of the present invention, the upper part of the outer shell 2 is provided with a propulsion mechanism for pushing the movable support platform 108 forward or backward with an air pump 105. The front end of the air pump 105 is provided with a first air pump telescopic rod 106 and a second air pump telescopic rod 107 for pushing the movable support platform 108 forward or backward. The second air pump telescopic rod 107 is connected to both sides of the movable support platform 108. The upper surface of the outer shell 2 is provided with an upward-opening outer shell groove 2104. A protruding block is provided inside the outer shell groove 2104. A cylinder 2103 is provided at the bottom of the protruding block. The cylinder 2103 penetrates the bottom of the protruding block. There is a gap between the cylinder 2103 and the protruding block. The cylinder 2103 can rotate inside the protruding block. A second fixing rod 27 is provided on the outer wall of the cylinder 2103 for moving the protruding block forward. A telescopic rod 2101 is provided at the front end of the protruding block. The protruding block is pushed by the second fixing rod 27, and the telescopic rod 2101 is pushed by the protruding block.

[0033] During operation, when the sand and gravel are about to contact the screen frame 1, the air pump 106 starts running, pushing the first air pump telescopic rod 106 forward. The first air pump telescopic rod 106 pushes the second air pump telescopic rod 107 forward. The second air pump telescopic rod 107 is connected to both sides of the movable support platform 108. The first air pump telescopic rod 106 and the second air pump telescopic rod 107 push forward, causing the movable support platform 108 to move forward horizontally. At the same time, there is no room for movement behind the protruding block, so it cannot move backward. The protruding block is used by the telescopic rod 2101 to push the screen frame 1. The cylinder inside the protruding block fixes the second fixing rod 27. Driven by 06, the movable support platform 108 moves forward horizontally. The second fixed rod drives the telescopic rod 2101, causing the telescopic rod 2101 to push against the screen frame 1 and move forward, always maintaining the same distance as the movable support platform 108. When screening begins, the screen frame 1 and the movable support platform 108 move forward quickly under the propulsion of the propulsion mechanism. During screening, the screen frame 1 and the movable support platform 108 move backward slowly under the propulsion mechanism. The telescopic rod 2101 tilts downward, and the screen frame 1 tilts downward as well. When screening ends, the screen frame 1 and the movable support platform 108 return to their initial state under the propulsion mechanism.

[0034] Therefore, by using a propulsion mechanism to rapidly move the screen frame 1 and the movable support platform 108 forward, the present invention allows the screen frame 1 to quickly move forward and contact the sand and gravel just before they are about to come into contact with it. Through the impact force and inertia brought by the propulsion mechanism, the present invention achieves both labor-saving and better screening of sand and gravel.

[0035] As a further embodiment of the present invention, the telescopic rod 2101 is connected to the screen frame 1 and the protruding block, and the telescopic rod 2101 is used to tilt the screen frame 1.

[0036] During operation, the telescopic rod 2101 extends and retracts to push the screen frame 1 to tilt forward. At the same time, it stops tilting when the screening angle is reached. After screening, the telescopic rod 2101 shakes and extends downward to drive the screen frame 1 to tilt downward. At this time, the screen frame 1 tilts downward and shakes along with it. The sand and gravel stuck inside the screen frame 1 will fall off with the shaking. The shaking stops when it returns to the initial state.

[0037] Therefore, the present invention allows the screen frame 1 with a large downward tilt to be raised by the extension and retraction of the telescopic rod 2101. When it is lowered, the telescopic rod 2101 shakes and the screen frame shakes along with it, causing the sand and gravel stuck in the screen frame 1 to fall off. This prevents the need for frequent cleaning during the screening process, thus saving cleaning time. At the same time, the large tilt in the initial state means that workers do not need to lift the screen to throw sand and gravel, saving workers' physical strength.

[0038] As a further embodiment of the present invention, the front end of the outer shell 2 is provided with a support platform 22 for moving the support platform 108 forward, the top end of the support platform 22 is provided with an open support platform groove 2201 for moving the support platform 108 forward, the rear end of the support platform groove 2201 is provided with a slider 2202, the slider 2202 is connected to the moving support platform 108 and drives the moving support platform 108 forward, and the front end of the support platform 22 is provided with a baffle 2203 for limiting the forward distance of the moving support platform 108.

[0039] When working, the movable support platform 108 is pushed forward. The slider 2202 at the bottom of the movable support platform 108 helps the movable support platform 108 to move forward better. The slider 2202 moves in the groove 2201 of the support platform until it stops at the baffle 2203.

[0040] Thus, the present invention facilitates the forward movement of the movable support platform 108 by means of the support platform groove 2201 and the slider 2202, and restricts the forward movement distance of the movable support platform 108 by means of the baffle 2203.

[0041] As a further embodiment of the present invention, the lifting mechanism includes an elastic protrusion provided on the inner surface of the second drag chain 2502, and a first fixing rod 26 fixed on the movable screen 13. The protrusion drives the first fixing rod 26 to rise by friction. When it rises to the top, it is blocked by the fifth fixing shaft 2501. The deformation of the protrusion passes through the first fixing rod 26.

[0042] During operation, the first fixed rod 26 begins to rise, driven by the protruding part of the second drag chain 2502. The side of the second drag chain 2502 that is in contact with the first fixed rod 26 is the protruding part. When the first fixed rod 26 rises to its highest point, it can no longer rise. When the protruding part of the second drag chain 2502 passes by, the gear of the first fixed rod 26 can only contact the protruding gear, not the gear of the second drag chain 2502. At this time, the first fixed rod 26 descends.

[0043] Therefore, by using the protruding part of the second drag chain 2502, the present invention raises the first fixing rod 26 to its top. Since the gear of the first fixing rod 26 cannot contact the normal gear of the second drag chain 2502, the first fixing rod 26 can be raised and lowered, thereby increasing the screening height and allowing the unscreened sand and gravel to roll down from the height to screen the remaining sand and gravel.

[0044] As a further embodiment of the present invention, a buffer device is provided at the bottom of the first fixing rod 26;

[0045] During operation, the first fixed rod 26 rises and falls. Because the bottom of the first fixed rod 26 is equipped with a buffer device, it will shake when it touches the bottom, which can reduce the damage rate and shake off the sand and gravel remaining on the movable screen 13.

[0046] Therefore, the present invention uses a buffer device on the first fixed rod 26 to reduce the damage rate when the first fixed rod is lowered, and at the same time vibrates and dislods the sand and gravel remaining on the movable screen 13.

[0047] As a further embodiment of the present invention, a material conveying mechanism is provided between the two outer shells 2. The material conveying mechanism includes a material conveying cart 3, which is used to store the screened sand. The bottom of the material conveying cart 3 is provided with rollers 32 for movement. The bottom of the material conveying cart 3 is provided with a material conveying cart groove. A fixing rod 34 for dragging the material conveying cart 3 is provided in the groove. The fixing rod 34 passes through the bottom of the material conveying cart groove. The connecting post 33 of the fixing rod 34 is connected to the third fixing rod 2403. The rear end of the material conveying cart 3 is provided with two symmetrical handles 31.

[0048] During operation, the No. 3 fixed rod 2403 drives the connecting column 33 to rotate and move forward. The connecting column 33 drives the fixed rod 34 to rotate and move forward. The fixed rod 34 passes through the groove of the material transport vehicle and rotates and moves forward in the groove of the material transport vehicle, pushing the material transport vehicle 3 forward. The rollers 32 at the bottom of the material transport vehicle 3 help the material transport vehicle 3 move better. When collecting sand, it will move forward and backward with the No. 3 fixed rod 2403. When the material transport vehicle 3 is stationary, it can collect most of the sand that has been sieved from the height. When the material transport vehicle 3 moves forward, it can collect the remaining small amount of sand that has rolled down. When the collection is finished, the worker only needs to press the handle 31 to make the front end of the material transport vehicle 3 lift up, so that the fixed rod 34 can be disengaged from the fixed groove of the material transport vehicle and move, and the material transport vehicle 3 can transport materials normally.

[0049] Therefore, the present invention, through the material conveying mechanism, can collect the remaining small amount of rolling sand when the material conveying vehicle 3 moves forward, and can collect most of the sand sieved from the height when stationary in the initial state. By having the worker tilt the front end of the material conveying vehicle 3, the problem of sand accumulating at the bottom of the traditional screen is solved, and all the sand can be collected in the material conveying vehicle 3. Furthermore, by tilting the front end of the material conveying vehicle 3, it is disengaged from the groove of the material conveying vehicle, so that the material conveying vehicle 3 can transport materials normally.

[0050] As a further embodiment of the present invention, the front end of the screen frame 1 is provided with a plurality of sensors 14, which are used to sense when sand and gravel are about to approach and the screen frame 1 starts to operate.

[0051] When the worker throws sand and gravel to a designated height, the sensor 14 at the front end of the screen frame 1 will detect it, and the material screening device will start.

[0052] Therefore, the present invention improves work efficiency by using the sensor 14 to detect when sand and gravel approach and start the material screening device.

[0053] As a further embodiment of the present invention, a first telescopic plate 16 and a second telescopic plate 17 for stones to roll off are provided above the support platform 22. The first telescopic plate 16 and the second telescopic plate 17 extend and deform according to the inclination of the screen frame 1.

[0054] During operation, the sieved stones will roll down from above until they roll out along 16 and 17. 16 and 17 will expand and contract with the tilt of screen frame 1, so the stones will not be unable to roll down due to the tilt of screen frame 1.

[0055] Therefore, the present invention, through the first telescopic plate 16 and the second telescopic plate 17, allows the first telescopic plate 16 and the second telescopic plate 17 to expand and contract to achieve the effect that the stones cannot roll off due to the tilt of the screen frame 1, thereby improving the efficiency of the operation.

[0056] As a further embodiment of the present invention, the housing 2 is provided with a transmission mechanism inside. The front and rear ends of the housing 2 are provided with a second fixed shaft 24 and a third fixed shaft 2401 fixed inside the housing 2. The first fixed shaft 23 drives the second fixed shaft 24 to rotate. The first drag chain 2402 provided at the front end of the second fixed shaft 24 drives the third fixed shaft 2401 to rotate. The second fixed rod 27 and the third fixed rod 2403 are provided between the second fixed shaft 24 and the third fixed shaft 2401. The second fixed rod 27 and the third fixed rod 2403 are fixed rods that move between the second fixed shaft 24 and the third fixed shaft 2401.

[0057] During operation, the first fixed shaft 23 rotates clockwise, and is fixed in rotation. The second fixed shaft 24 is driven to rotate counterclockwise, and is fixed in rotation. The second fixed shaft 24 drives the first drag chain 2402, which in turn drives the second fixed rod 27 to rotate counterclockwise forward. The first drag chain 2402 drives the third fixed rod 2403 to rotate counterclockwise forward, and the third fixed shaft 2401 rotates counterclockwise, and is fixed in rotation. Thus, this invention, through the transmission mechanism, enables linkage between devices, improving operational efficiency.

Claims

1. An adjustable construction material screening device comprising a screen frame (1), characterised in that: The inner connection of the screen frame (1) is provided with a screen (12) for screening sand and gravel, the front end of the screen (12) is provided with a movable screen (13), the lower end of the screen frame (1) is provided with a movable support table (108) for supporting the screen frame (1), the left and right ends of the movable support table (108) are provided with a shell (2), the upper part of the shell (2) is provided with a propulsion mechanism, the propulsion mechanism comprises an air pump (105), the air pump (105) is used to push the movable support table (108) forward or backward, the bottom end of the movable support table (108) is provided with a rotating mechanism, the lower bottom end of the movable support table (108) is provided with a rotating shaft (101) for lifting or falling of the screen frame (1), the front bottom end of the movable support table (108) includes a support rod (102), a support column (103) and a groove (104) on the left and right sides, which is used to limit the lifting and falling amplitude of the screen frame (1), the upper part of the shell (2) is provided with a telescopic rod (2101), which is used to drive the lifting and falling action of the screen frame (1), the original state of the screen frame (1) is a large amplitude inclined state, the rotating mechanism is used to drive the screen frame (1) to rotate upward to the vertical direction, the two sides of the screen frame (1) are provided with a lifting mechanism for driving the movable screen (13) to move, the lifting mechanism comprises a motor (21), the motor shaft of the motor (21) is fixedly connected with a first fixed shaft (23), the first fixed shaft (23) rotates through a third drag chain (2503), the third drag chain (2503) drives a fourth fixed shaft (25) to rotate, the front end of the screen frame (1) is provided with a fifth fixed shaft (2501) on both sides, the fifth fixed shaft (2501) is rotatably installed on both sides of the top of the screen frame (1), the fifth fixed shaft (2501) drives a second drag chain (2502) to rise, the second drag chain (2502) drives the fifth fixed shaft (2501) to rotate, the movable screen (13) and the second drag chain (2502) are drivingly connected through a first fixed rod (26).

2. An adjustable construction material screening device according to claim 1, characterized in that: The upper part of the shell (2) is provided with a propulsion mechanism, which comprises an air pump (105) for pushing the mobile support table (108) forward or backward, the front end of the air pump (105) is provided with a first air pump telescopic rod (106) and a second air pump telescopic rod (107) for pushing the mobile support table (108) forward or backward, the second air pump telescopic rod (107) is connected on both sides of the mobile support table (108), the upper surface of the shell (2) is provided with a shell groove (2104) opening upward, the inside of the shell groove (2104) is provided with a protruding block, the bottom of the protruding block is provided with a cylinder (2103), the cylinder (2103) penetrates the bottom of the protruding block, there is a gap between the cylinder (2103) and the protruding block, the cylinder (2103) can rotate inside the protruding block, the outer wall of the cylinder (2103) is provided with a second fixed rod (27) for advancing the protruding block, the front end of the protruding block is provided with a telescopic rod (2101), the protruding block is pushed by the second fixed rod (27), and the telescopic rod (2101) is pushed by the protruding block.

3. An adjustable construction material screening device according to claim 1, characterized in that: The telescopic rod (2101) is connected on the screen frame (1) and the protruding block, and the telescopic rod (2101) is used for tilting the screen frame (1).

4. An adjustable construction screeding device according to claim 2, wherein: The front end of the shell (2) is provided with a support table (22) for advancing the mobile support table (108), the top end of the support table (22) is provided with an open support table groove (2201) for advancing the mobile support table (108), the rear end of the support table groove (2201) is provided with a sliding block (2202), the sliding block (2202) is connected on the mobile support table (108) to drive the mobile support table (108) to advance, and the front end of the support table (22) is provided with a baffle (2203) for limiting the advancing distance of the mobile support table (108).

5. An adjustable construction material screening device according to claim 1, wherein: The ascending mechanism comprises a protruding part with a surface provided in the second drag chain (2502), the first fixed rod (26) is fixed on the movable screen (13), the protruding part drives the first fixed rod (26) to ascend in a frictional mode, and when ascending to the top, the protruding part is blocked by the fifth fixed shaft (2501) and deforms through the first fixed rod (26).

6. An adjustable construction screed according to claim 5, wherein: The bottom of the first fixed rod (26) is provided with a buffer device.

7. An adjustable construction material screening device according to claim 1, wherein: The material conveying mechanism is arranged between the two shells (2), and the material conveying mechanism comprises a material conveying vehicle (3), the material conveying vehicle (3) is used for storing screened sand, the bottom of the material conveying vehicle (3) is provided with rollers (32) for movement, the bottom of the material conveying vehicle (3) is provided with a material conveying vehicle groove, a fixed rod (34) for dragging the material conveying vehicle (3) to move is arranged in the groove, the fixed rod (34) penetrates the bottom of the material conveying vehicle groove, the fixed rod (34) is provided with a connecting column (33), the connecting column (33) is connected on a third fixed rod (2403), and the rear end of the material conveying vehicle (3) is provided with two symmetrical handles (31).

8. An adjustable construction material screening device according to claim 1, wherein: The front end of the screen frame (1) is provided with a plurality of sensors (14) for sensing the start of operation of the screen frame (1) when the sand and gravel are about to approach.

9. An adjustable construction screeding device according to claim 4, wherein: The upper part of the support table (22) is provided with a first telescopic plate (16) and a second telescopic plate (17) for the rolling of the gravel, which are telescopic and deformed according to the inclination of the screen frame (1).

10. An adjustable construction material screening device according to claim 1, wherein: The inside of the shell (2) is provided with a transmission mechanism, the front and rear ends of the shell (2) are provided with a second fixed shaft (24) and a third fixed shaft (2401) fixed in the inside of the shell (2), the first fixed shaft (23) drives the second fixed shaft (24) to rotate, the front end of the second fixed shaft (24) is provided with a first drag chain (2402) to drive the third fixed shaft (2401) to rotate, the second fixed shaft (24) and the third fixed shaft (2401) are provided with a second fixed rod (27) and a third fixed rod (2403) between them, the second fixed rod (27) and the third fixed rod (2403) are fixed rods, which move between the second fixed shaft (24) and the third fixed shaft (2401).

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