Sand screening machine for building construction
By combining an automatic screening mechanism and an electric feeding mechanism, the problems of low efficiency and high labor intensity of traditional manual sand screening are solved, achieving efficient sand screening and reducing the burden on workers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 陕西劲晖建设工程有限公司
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional manual sand sifting is inefficient, labor-intensive, and can easily lead to health problems such as arm strain and back pain.
It adopts an automatic screening mechanism and an electric feeding mechanism. Through the design of the reciprocating screen frame and inclined guide rail, combined with electric feeding, it realizes automatic screening and efficient addition of sand, reducing manual sand throwing.
It improves sand screening efficiency, reduces the labor intensity of workers, and reduces health problems such as arm strain and back pain.
Smart Images
Figure CN224443731U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sand screening equipment technology, and in particular to a sand screening machine for building construction projects. Background Technology
[0002] Sand sieving is a crucial step in construction engineering to ensure material quality and construction effectiveness. The purpose of sand sieving is twofold: firstly, to use a sieve to remove large particles such as gravel, shells, and plant roots from the sand to avoid affecting the uniformity of the material; and secondly, to obtain sand of the required particle size for the current construction process.
[0003] In traditional construction projects, manual sand sifting involves taut and fixed screens to a frame, placed flat on the ground or above the opening of a container. Workers use shovels to evenly spread the sand to be sifted onto the screen. The sand is then sieved by the inertia of the sifting process. The sand passes through the screen and falls to the bottom, while impurities remain on the surface. To ensure the effectiveness of the screen, workers need to regularly clean the impurities accumulated on it.
[0004] However, the traditional manual sand sifting method is not only inefficient, but also requires workers to constantly throw sand high up on the screen, which can easily lead to health problems such as arm strain and back pain. Utility Model Content
[0005] This application provides a sand screening machine for building construction projects, which can improve sand screening efficiency while reducing the labor intensity of workers.
[0006] The above-mentioned objective of this application is achieved through the following technical solution:
[0007] A sand screening machine for building construction includes an automatic screening mechanism and an electric feeding mechanism, wherein the electric feeding mechanism is used to add the sand to be screened to the automatic screening mechanism.
[0008] The automatic screening mechanism includes a main frame, on the upper side of which two symmetrical guide rails are welded. A screen frame is placed above the two guide rails. A transmission rod is hinged to one end of the screen frame. The end of the transmission rod away from the screen frame is connected to a reciprocating assembly. The reciprocating assembly can drive the screen frame to reciprocate along its length on the guide rails.
[0009] The electric feeding mechanism includes a lateral support frame and a lifting unit located on one side of the main frame. The lateral support frame has a hopper on the side away from the main frame. The hopper is connected to the lifting unit, and the maximum lifting height of the lifting unit is greater than the upper height of the lateral support frame.
[0010] Furthermore, the sieve frame includes a sieving frame and a collecting frame. A metal screen is installed at the bottom of the sieving frame, and the collecting frame is located on the lower side of the metal screen on the sieving frame. The four corners of the collecting frame and the four corners of the sieving frame are connected by a support pole.
[0011] Furthermore, the guide rail is inclined on the main frame, with one end of the guide rail closer to the reciprocating assembly being higher than the other end;
[0012] Both the screening frame and the collecting frame have a discharge port at the end away from the reciprocating component, and the discharge ports of the screening frame and the collecting frame are offset from each other along the width direction of the main frame.
[0013] Furthermore, the cross-section of the guide rail is an isosceles triangle, and the tip of the guide rail faces upward; a grooved wheel is installed at each of the four lower corners of the collection frame, and the collection frame is placed on the guide rail by the grooved wheel below it.
[0014] Furthermore, the reciprocating assembly includes a drive disk, and a mounting shaft is provided on the edge of the drive disk. The mounting shaft and the end of the transmission rod away from the collection frame are hinged together. The center point of the drive disk is fixedly sleeved on the rotating main shaft. The rotating main shaft is rotatably connected to the main frame through two bearing seats.
[0015] A first pulley is provided between the two bearing seats, and the first pulley is sleeved on the rotating main shaft. The lower side of the first pulley is connected to a second pulley through a transmission belt. The second pulley is fixedly sleeved on the output shaft of the first motor. The housing of the first motor is fixedly connected to the main frame.
[0016] Furthermore, the cross-section of the hopper is a right-angled trapezoid, and the distance between the connection point of the hopper and the lifting unit and the upper bottom of the hopper is less than the distance between the connection point of the hopper and the lifting unit and the lower bottom of the hopper.
[0017] Furthermore, multiple rollers are movably installed in the middle of the lateral support frame along the vertical direction, and each roller can rotate freely along its own axis. Two horizontal crossbars are fixedly installed on the upper end of the lateral support frame near the screen frame, and a support stop is fixedly connected between the two horizontal crossbars. The height of the support stop in the vertical direction is not higher than the height of the highest roller in the lateral support frame.
[0018] Furthermore, the lifting unit includes a portal column, a supporting base plate is welded to the lower end of the portal column, a threaded rod is inserted into the portal column, the upper and lower ends of the threaded rod are rotatably connected to the top beam of the portal column and the base on the base plate, respectively, and a second motor is installed on the upper side of the top beam of the portal column, the output end of the second motor is fixedly connected to the upper end of the threaded rod.
[0019] The threaded rod is threaded with a slider, and the slider is slidably connected to the portal column in the vertical direction; part of the slider is located outside the portal column, and a force transmission rod is inserted through the part of the slider located outside the portal column and the two are rotatably connected;
[0020] One end of the force transmission rod is fixedly connected to the outer wall of the hopper.
[0021] In summary, this application includes at least one of the following beneficial technical effects:
[0022] The screen frame of this application reciprocates along its length on the guide rail of the main frame via a reciprocating assembly, thus achieving a shaking effect on the screen. When sand falls onto the screen, the movement of the screen forces the sand to undergo a combination of tumbling and sliding motions. Compared to traditional manual sand sifting, this movement forces the sand layer to loosen, accelerating the sifting speed of the screen. The sand processed by the automatic sifting mechanism of this application is added via an electric feeding mechanism. Compared to the method of frequently tossing sand with a shovel, this reduces the labor intensity of workers, effectively improving health problems such as arm strain and shoulder pain caused by continuous high-intensity sand sifting. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the overall structure of this application;
[0025] Figure 2 This is a top view of this application;
[0026] Figure 3 yes Figure 2 Enlarged structural diagram at point A;
[0027] Figure 4 This is a schematic diagram of the state of the hopper of this application when dumping sand.
[0028] Reference numerals: 1. Automatic screening mechanism; 101. Main frame; 102. Guide rail; 103. Screen frame; 1031. Screening frame; 1032. Collection frame; 1033. Metal screen; 1034. Support pole; 104. Transmission rod; 105. Reciprocating assembly; 1051. Drive disc; 1052. Mounting shaft; 1053. Rotating main shaft; 1054. Bearing seat; 1055. First pulley; 10 56. Transmission belt; 1057. Second pulley; 1058. First motor; 2. Electric feeding mechanism; 21. Side support frame; 22. Lifting unit; 221. Portal column; 222. Support base plate; 223. Threaded rod; 224. Second motor; 225. Sliding block; 226. Force transmission rod; 23. Hopper; 3. Discharge port; 4. Grooved wheel; 5. Roller; 6. Horizontal crossbar; 7. Support stop bar. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.
[0030] like Figures 1-4 As shown, this application discloses a sand screening machine for building construction, which includes an automatic screening mechanism 1 and an electric feeding mechanism 2. The electric feeding mechanism 2 is used to add the sand to be screened to the automatic screening mechanism 1.
[0031] The automatic screening mechanism 1 includes a main frame 101. Two symmetrical guide rails 102 are welded to the upper side of the main frame 101. A screen frame 103 is placed above the two guide rails 102. A transmission rod 104 is hinged to one end of the screen frame 103. The end of the transmission rod 104 away from the screen frame 103 is connected to a reciprocating assembly 105. The reciprocating assembly 105 can drive the screen frame 103 to reciprocate along its length on the guide rails 102.
[0032] The electric feeding mechanism 2 includes a lateral support frame 21 and a lifting unit 22 located on one side of the main frame 101. The lateral support frame 21 is provided with a hopper 23 on the side away from the main frame 101. The hopper 23 is connected to the lifting unit 22, and the maximum lifting height of the lifting unit 22 is greater than the upper height of the lateral support frame 21.
[0033] In the above embodiments, the main frame 101 of this application is a support skeleton welded from angle steel. The main frame 101 can provide an installation foundation for various components and equipment, and can also lift the screen frame 103 off the ground to a certain height so that workers can use handcarts or other transfer tools to retrieve the sieved sand from below the screen. The reciprocating component 105 of this application is connected to the screen frame 103 and can push the screen to reciprocate on the guide rail 102 of the main frame 101. This achieves the effect of shaking the screen. When the sand falls onto the screen, the movement of the screen can force the sand to undergo a combination of rolling, sliding, and other complex actions. Compared with the traditional manual sand sifting method, this movement can force the sand layer to loosen and accelerate the sifting speed of the screen. The sand processed by the automatic screening mechanism 1 of this application is added by the electric feeding mechanism 2. In the initial stage of feeding, the hopper 23 is close to the ground, and the worker can easily add the sand to be screened into the hopper 23. After the hopper 23 is filled with sand, the lifting unit 22 can lift the hopper 23 into the air. As the hopper 23 gradually rises above the side support frame 21, the hopper 23 will fall towards the screen frame 103 under its own gravity. Compared with the method of frequently throwing sand with a shovel, the labor intensity of the worker can be reduced. In this way, the health problems such as arm strain and arm pain caused by continuous high-intensity sand screening can be effectively improved.
[0034] Furthermore, such as Figure 1 As shown, the sieve frame 103 includes a screening frame 1031 and a collection frame 1032. A metal screen 1033 is installed at the bottom of the screening frame 1031. The collection frame 1032 is located on the lower side of the metal screen 1033 on the screening frame 1031, and the four corners of the collection frame 1032 and the four corners of the screening frame 1031 are connected by a support rod 1034.
[0035] In the above embodiments, the screening frame 1031 and the collection frame 1032 of this application are fixedly connected together by the support rod 1034. In this way, the screening frame 103 can maintain the effect of synchronous movement of the screening frame 1031 and the collection frame 1032 during use. The screening frame 1031 is provided with a metal screen 1033. The aperture of the metal screen 1033 matches the sand particle size required by the corresponding process of the construction project. When the sand to be screened falls on the metal screen 1033, as the metal screen 1033 moves back and forth on the main frame, the qualified sand will fall smoothly through the mesh of the metal screen 1033 and fall down. The collection frame 1032, located below the screening frame 1031 and moving synchronously with it, can catch these qualified sands, while impurities will remain on the screening frame 1031. Through the screening frame 1031 and the collection frame 1032 of this application, the effect of classifying and collecting qualified sand and unqualified impurities can be achieved respectively.
[0036] Furthermore, such as Figure 1 and Figure 2As shown, the guide rail 102 is tilted on the main frame 101, with one end of the guide rail 102 closer to the reciprocating assembly 105 being higher than the other end.
[0037] Both the screening frame 1031 and the collection frame 1032 have a discharge port 3 at the end away from the reciprocating assembly 105, and the discharge port 3 of the screening frame 1031 and the discharge port 3 of the collection frame 1032 are offset from each other along the width direction of the main frame 101.
[0038] In the above embodiments, the guide rail 102 of this application is inclined above the main frame 101, so that the screen frame 103 on it will also be inclined. When the reciprocating component 105 drives the screen frame 103 to reciprocate along the guide rail 102, the screening frame 1031 and the collection frame 1032 also achieve the effect of reciprocating between the low and high points of the guide rail 102. In addition, both the screening frame 1031 and the collection frame 1032 are provided with a discharge port 3 at the lower end of the guide rail 102. In this way, during the process of the screening frame 1031 and the collection frame 1032 moving back and forth, the material on the screening frame 1031 and the collection frame 1032 will slowly move towards their respective discharge ports 3 under the action of gravity. The positions of the discharge ports 3 of the screening frame 1031 and the collection frame 1032 along the width direction of the main frame 101 are not the same, and they are staggered. In this way, before screening sand, the worker can place a trolley under each of the two discharge ports 3, and the material discharged from the screening frame 1031 and the collection frame 1032 can be automatically collected by the two trolleys for subsequent transfer operations by the worker.
[0039] Furthermore, such as Figure 1 As shown, the cross-section of the guide rail 102 is an isosceles triangle, and the tip of the guide rail 102 is pointing upwards; a grooved wheel 4 is installed at each of the four lower corners of the collection frame 1032, and the collection frame 1032 is placed on the guide rail 102 through the grooved wheel 4 below it.
[0040] In the above embodiments, the guide rail 102 of this application is an angle iron, specifically an isosceles right triangle in cross-section. When it is installed on the main frame, its pointed end faces upwards, so that the slot on the grooved wheel 4 below the collection frame 1032 can be precisely engaged with the pointed end of the guide rail 102. When the entire screen moves along the guide rail 102, the guide rail 102 can utilize its pointed end to guide and limit the grooved wheel 4, making the overall operation of the screen frame 103 more stable and safe.
[0041] Furthermore, such as Figures 2-4As shown, the reciprocating assembly 105 includes a drive disk 1051, and a mounting shaft 1052 is provided on the side of the drive disk 1051. The mounting shaft 1052 and the end of the transmission rod 104 away from the collection frame 1032 are hinged together. The center point of the drive disk 1051 is fixedly sleeved on the rotating main shaft 1053. The rotating main shaft 1053 is rotatably connected to the main frame 101 through two bearing seats 1054.
[0042] A first pulley 1055 is provided between the two bearing seats 1054, and the first pulley 1055 is sleeved on the rotating main shaft 1053. The lower side of the first pulley 1055 is connected to the second pulley 1057 through the transmission belt 1056. The second pulley 1057 is fixedly sleeved on the output shaft of the first motor 1058. The housing of the first motor 1058 is fixedly connected to the main frame 101.
[0043] In the above embodiments, in order to reduce the distance between the lateral support frame 21 and the screen frame 103 (so that the overall length of the hopper 23 can be reduced), the first motor 1058 of this application is located in a lower position in the main frame. In order to smoothly transmit the power of the first motor 1058 to the screen frame 103 at a higher position, this application adds a first pulley 1055, a second pulley 1057 and a transmission belt 1056 between the rotating main shaft 1053 and the first motor 1058, which are close in height to the screen frame 103. The first pulley 1055 is connected to the rotating main shaft 1053, the second pulley 1057 is connected to the output shaft of the first motor 1058, and the first pulley 1055 and the second pulley 1057 are connected by the transmission belt 1056. In this way, when the first motor 1058 at a lower position works, the rotating main shaft 1053 at a higher position can rotate synchronously.
[0044] In this application, a drive disk 1051 is mounted on one end of the rotating main shaft 1053. A mounting shaft 1052 is provided on one side of the drive disk 1051. The axis of the mounting shaft 1052 is parallel to the axis of the drive disk 1051. A transmission rod 104 is provided between the mounting shaft 1052 and the collection frame 1032. The two ends of the transmission rod 104 are respectively hinged to the mounting shaft 1052 on the drive disk 1051 and the collection frame 1032. In this way, the drive disk 1051 and the transmission rod 104 can form a reciprocating mechanism similar to a crank-slider mechanism. When the first motor 1058 rotates continuously, the drive disk 1051 and the transmission rod 104 can convert the unidirectional rotation into the effect of driving the screen frame 103 to reciprocate on the guide rail 102. The rotation speed of the motor is proportional to the shaking speed of the screen. The speed of the motor is obviously higher than that of manual operation. Therefore, the reciprocating component 105 of the above structure of this application can significantly improve the sand processing efficiency of the screen frame 103.
[0045] Furthermore, such as Figure 2 and Figure 4As shown, the cross-section of the hopper 23 is a right trapezoid, and the distance between the connection point of the hopper 23 and the lifting unit 22 and the upper bottom of the hopper 23 is less than the distance between the connection point of the hopper 23 and the lifting unit 22 and the lower bottom of the hopper 23.
[0046] In the above embodiments, the cross-sectional shape of the hopper 23 of this application is a right-angled trapezoid. When loading sand, both the upper and lower bases are vertical, with the upper base side close to the worker loading sand and the lower base side adjacent to the lateral support frame 21. This reduces the height the worker can lift the sand when loading it, thus reducing the strength required for operation and the range of hand movements. Compared with the traditional method of using a sieve placed at an angle on the ground, this effectively reduces the labor intensity of workers. When a person exerts force with their hands, their back and waist often need to assist in exerting force simultaneously, which is the main reason why workers experience back pain during traditional manual sand sifting. However, when a worker loads sand into the hopper 23 of this application, the height the sand is lifted is much lower than the height the sand is thrown up during traditional sand sifting. Therefore, the fatigue of the worker's hands and back can be effectively alleviated when using the sand sifting machine of this application.
[0047] The connection point between the hopper 23 and the lifting unit 22 is not on the midline, but is biased towards the upper bottom side of the hopper 23. Thus, when the hopper 23 is lifted by the lifting unit 22 to pass the lateral support frame 21, since the center of gravity of the hopper 23 is biased towards the screen frame 103, the hopper 23 will automatically tilt towards the screen frame 103 under the action of gravity after losing the constraint of the lateral support frame 21, thereby achieving the effect of automatically pouring the sand in the hopper 23 into the screen frame 103.
[0048] Furthermore, such as Figure 1 As shown, multiple rollers 5 are movably installed in the middle of the lateral support frame 21 along the vertical direction. Each roller 5 can rotate freely along its own axis. Two horizontal crossbars 6 are fixedly installed on the upper end of the lateral support frame 21 near the screen frame 103. A support rod 7 is fixedly connected between the two horizontal crossbars 6. The height of the support rod 7 in the vertical direction is not higher than the height of the highest roller 5 in the lateral support frame 21.
[0049] In the above embodiments, the hopper 23 will come into contact with the side support frame 21 during the process of moving up and down along the side support frame 21. In this application, rollers 5 that can rotate freely around their own axis are installed in the area in the middle of the side support frame 21 where it will come into contact with the hopper 23. In this way, the friction between the side support frame 21 and the hopper 23 can be reduced during the movement of the hopper 23, thereby reducing the burden on the lifting unit 22.
[0050] The distance between the side support frame 21 and the discharge port of the hopper 23 is relatively far. The roller 5 at the highest point of the side support frame 21 provides limited support to the discharge port of the hopper 23. Therefore, in order to improve the stability of the hopper 23 during the sand pouring process, this application adds a support rod 7 to the side of the side support frame 21 that is biased towards the screen frame 103, as described above. The support rod 7 is fixedly connected to the side support frame 21 through two horizontal crossbars 6. When the hopper 23 pours sand, the support rod 7 of this application can provide sufficient support to its discharge port, so that the sand poured out of the hopper 23 falls steadily into the screen frame 103.
[0051] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, the lifting unit 22 includes a portal column 221. A supporting base plate 222 is welded to the lower end of the portal column 221. A threaded rod 223 is inserted into the portal column 221. The upper and lower ends of the threaded rod 223 are rotatably connected to the top beam of the portal column 221 and the base on the base plate, respectively. A second motor 224 is installed on the upper side of the top beam of the portal column 221. The output end of the second motor 224 is fixedly connected to the upper end of the threaded rod 223.
[0052] A slider 225 is threadedly connected to the threaded rod 223, and the slider 225 is slidably connected to the portal column 221 in the vertical direction; part of the slider 225 is located outside the portal column 221, and a force transmission rod 226 is inserted through the part of the slider 225 located outside the portal column 221 and the two are rotatably connected.
[0053] One end of the force transmission rod 226 is fixedly connected to the outer wall of the hopper 23.
[0054] In the above embodiments, the upper and lower ends of the threaded rod 223 provided in the portal column 221 of this application are rotatably connected to the top beam of the portal column 221 and the support base plate 222 at the lower end of the portal column 221, respectively. The second motor 224 located on the top beam of the portal column 221 is connected to one end of the threaded rod 223. After the second motor 224 is started, the threaded rod 223 will rotate continuously inside the portal column 221. In this application, a slider 225 is threadedly connected to the threaded rod 223, and the slider 225 is slidably connected to the portal column 221 in the vertical direction (there are at least two ways to achieve this effect: one is to set the width of the slider 225 to be the same as the width of the internal space of the portal column 221, so that under the guidance of the threaded rod 223, the slider 225 can only move in the vertical direction within the portal column 221 and cannot rotate; the other is to set a protrusion on the slider 225 and set matching grooves on the inner side of the two columns on the portal column 221, so that under the guidance of the threaded rod 223, the slider 225 will only move in the vertical direction within the portal column 221 and will not rotate around the axis of the threaded rod 223). A force transmission rod 226 is fixedly connected to the side of the hopper 23 near the portal column 221, and the end of the force transmission rod 226 away from the hopper 23 is inserted through the part of the slider 225 that extends out of the portal column 221 and the two are rotatably connected. In practical use, the second motor 224 can switch its rotation direction to move the hopper 23 up and down, thus helping workers to move the sand from the lower part to the top of the screen frame 103, reducing the labor intensity of workers in the sand screening process.
[0055] The implementation principle of this embodiment is as follows: Before use, the hopper 23 of this application is in a vertical state (i.e., its discharge port is vertically upward), and its lower end is placed on the ground; during use, the worker first places a handcart on the lower side of the discharge port 3 of the screening frame 1031 and the collection frame 1032 respectively, and then loads the sand to be screened into the hopper 23. After loading the sand, the second motor 224 is started. The second motor 224 will gradually lift the hopper through the threaded rod 223. Since the connection point between the hopper 23 and the force transmission rod 226 is biased towards its upper bottom side, during the lifting process of the hopper 23, because its center of gravity is close to the lateral support frame 21, the hopper 23 will... Under the influence of gravity, the hopper 23 remains in close contact with the side support frame 21. As the body of the hopper 23 gradually passes the side support frame 21, the hopper 23 will automatically tilt towards the screen frame 103. During the tilting process of the hopper 23, the support rod 7 can provide support and limit the discharge port. As the connection end between the hopper 23 and the force transmission rod 226 continues to rise, the tilt angle of the hopper 23 will become larger. After the sand in the hopper 23 is emptied, the second motor 224 can be started to reverse and make the slider 225 move down along the threaded rod 223. As the slider 225 moves down, the hopper 23 can be placed back on the ground, and the worker can continue the above operation.
[0056] The first motor 1058 in the automatic screening mechanism 1 of this application starts after the sand screening work begins. This allows the sand from the hopper 23 to fall onto the screen frame 103, which then automatically performs the screening operation. Compared to the manual method of frequently tossing sand with a shovel, the sand screening equipment of this application not only achieves efficient sand screening through automatic shaking, but also reduces the physical exertion required for workers to shovel sand through the lifting unit 22. Therefore, the sand screening equipment of this application not only improves the sand screening effect at construction sites, but also reduces the labor intensity of workers during the sand screening process. Consequently, health problems such as arm strain and shoulder pain caused by continuous high-intensity sand screening can be effectively improved.
[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A sand screening machine for use in a housing construction project, characterised in that: It includes an automatic screening mechanism (1) and an electric feeding mechanism (2), wherein the electric feeding mechanism (2) is used to add the sand to be screened to the automatic screening mechanism (1); The automatic screening mechanism (1) includes a main frame (101), on which two symmetrical guide rails (102) are welded. A screen frame (103) is placed above the two guide rails (102). A transmission rod (104) is hinged to one end of the screen frame (103). The end of the transmission rod (104) away from the screen frame (103) is connected to a reciprocating assembly (105). The reciprocating assembly (105) can drive the screen frame (103) to reciprocate along its length on the guide rails (102). The electric feeding mechanism (2) includes a lateral support frame (21) and a lifting unit (22) located on one side of the main frame (101). The lateral support frame (21) has a hopper (23) on the side away from the main frame (101). The hopper (23) is connected to the lifting unit (22), and the maximum lifting height of the lifting unit (22) is greater than the upper height of the lateral support frame (21).
2. The sand screening machine for housing construction works as claimed in claim 1 wherein: The sieve frame (103) includes a sieve frame (1031) and a collection frame (1032). A metal screen (1033) is installed at the bottom of the sieve frame (1031). The collection frame (1032) is located on the sieve frame (1031) below the metal screen (1033). The four corners of the collection frame (1032) and the four corners of the sieve frame (1031) are connected by a support rod (1034).
3. The sand screening machine for housing construction works as claimed in claim 2 wherein: The guide rail (102) is inclined on the main frame (101), with one end of the guide rail (102) closer to the reciprocating assembly (105) being higher than the other end; Both the screening frame (1031) and the collection frame (1032) have a discharge port (3) at the end away from the reciprocating component (105), and the discharge port (3) of the screening frame (1031) and the discharge port (3) of the collection frame (1032) are offset from each other along the width direction of the main frame (101).
4. The sand screening machine for housing construction works as claimed in claim 3 wherein: The cross-section of the guide rail (102) is an isosceles triangle, and the tip of the guide rail (102) is pointing upward; a grooved wheel (4) is installed at each of the four lower corners of the collection frame (1032), and the collection frame (1032) is placed on the guide rail (102) through the grooved wheel (4) below it.
5. The sand screening machine for housing construction works as claimed in claim 4 wherein: The reciprocating assembly (105) includes a drive disk (1051), and a mounting shaft (1052) is provided on the side of the drive disk (1051). The mounting shaft (1052) and the end of the transmission rod (104) away from the collection frame (1032) are hinged together. The center point of the drive disk (1051) is fixedly sleeved on the rotating main shaft (1053). The rotating main shaft (1053) is rotatably connected to the main frame (101) through two bearing seats (1054). A first pulley (1055) is provided between the two bearing seats (1054), and the first pulley (1055) is sleeved on the rotating main shaft (1053). The lower side of the first pulley (1055) is connected to the second pulley (1057) through the transmission belt (1056). The second pulley (1057) is fixedly sleeved on the output shaft of the first motor (1058). The housing of the first motor (1058) is fixedly connected to the main frame (101).
6. The sand screening machine for building construction projects according to any one of claims 1 to 5, characterized in that: The cross-section of the hopper (23) is a right trapezoid. The distance between the connection point of the hopper (23) and the lifting unit (22) and the upper bottom of the hopper (23) is less than the distance between the connection point of the hopper (23) and the lifting unit (22) and the lower bottom of the hopper (23).
7. A sand screening machine for housing construction works as claimed in claim 6, wherein: Multiple rollers (5) are movably installed in the middle of the lateral support frame (21) along the vertical direction. Each roller (5) can rotate freely along its own axis. Two horizontal crossbars (6) are fixedly installed on the upper end of the lateral support frame (21) near the screen frame (103). A support rod (7) is fixedly connected between the two horizontal crossbars (6). The height of the support rod (7) in the vertical direction is not higher than the height of the roller (5) at the highest point in the lateral support frame (21).
8. The sand screening machine for housing construction works as claimed in any one of the claims 1 to 5 wherein: The lifting unit (22) includes a portal column (221), the lower end of which is welded with a supporting base plate (222). A threaded rod (223) is inserted into the portal column (221). The upper and lower ends of the threaded rod (223) are rotatably connected to the top beam of the portal column (221) and the base on the base plate, respectively. A second motor (224) is installed on the upper side of the top beam of the portal column (221). The output end of the second motor (224) is fixedly connected to the upper end of the threaded rod (223). A slider (225) is threaded onto the threaded rod (223), and the slider (225) is slidably connected to the portal column (221) in the vertical direction; part of the slider (225) is located outside the portal column (221), and a force transmission rod (226) is inserted through the part of the slider (225) located outside the portal column (221) and the two are rotatably connected; One end of the force transmission rod (226) is fixedly connected to the outer wall of the hopper (23).