Building concrete mixing equipment with sand screening function

Abstract

The invention discloses building concrete stirring equipment with a sand screening function, and relates to the technical field of concrete stirring equipment. The stirring machine comprises a stirring machine body, a hopper is fixedly installed behind the stirring machine body, an installation support is fixedly installed above the hopper, a motor is fixedly installed above the rear side of the installation support, the output end of the motor is fixedly connected with a driving rod, and the driving rod is rotatably installed above the rear side of the installation support; and a rotating rod is rotationally mounted above the front side of the mounting bracket. Through the arrangement of the mixer main body, the drum screen, the feeding hole, the hopper, the mounting bracket, the motor, the driving rod and the rotating rod, sand which does not meet the particle size requirement is temporarily retained in the drum screen by the drum screen, so that the sand screening effect is achieved, the screened sand falls into the mixer main body through the hopper to be stirred, and the material quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete mixing equipment, and specifically relates to a building concrete mixing equipment with a sand screening function. Background Technique

[0002] Concrete is a composite material obtained by using general cement as a cementing material, ordinary sand and gravel materials as aggregates, ordinary water as a neutralizing medium, and then mixing, forming, and curing according to a specially designed mix ratio. A concrete mixing device is a device that can mix cement, sand, gravel, and ordinary water.

[0003] The patent with the patent announcement number CN112792986B discloses a concrete mixing device, which includes a mixing body. One end of the mixing body is provided with a feeding square pipe, and a screening member is arranged in the feeding square pipe. The screening member includes a screening mesh plate and a receiving enclosing plate; the screening mesh plate is located on the inner side wall of the receiving enclosing plate, and a positioning component is jointly arranged between the receiving enclosing plate and the feeding square pipe; a slot-shaped hole is penetrated through the outer side wall of the feeding square pipe and above the screening mesh plate, an embedded slot is arranged at the top wall of the feeding square pipe at the position of the slot-shaped hole, and a limiting plate is jointly arranged in the embedded slot and the slot-shaped hole of the feeding square pipe. This patent has the effect that the screening member can effectively screen out materials with a larger outer diameter size, effectively improves the mixing efficiency of the mixing body for the materials, and ensures the forming quality of the concrete.

[0004] However, the current concrete mixing device has the following problems: the sand screening efficiency of this concrete mixing device is relatively low, and as the large-grained materials screened out by the screen increase during use, the screen will be blocked, thereby affecting the sand screening efficiency, and it is necessary to clean the screen regularly manually, and the manual operation is rather troublesome. Therefore, we propose a building concrete mixing equipment with a sand screening function. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a building concrete mixing equipment with a sand screening function, which solves the problems raised in the above background technique.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a construction concrete mixing equipment with sand screening function comprises a mixer body, a hopper is fixedly installed at the rear of the mixer body, a mounting bracket is fixedly installed above the hopper, a motor is fixedly installed above the rear side of the mounting bracket, a driving rod is fixedly connected to the output end of the motor, the driving rod is rotatably installed above the rear side of the mounting bracket, a rotating rod is rotatably installed above the front side of the mounting bracket, a drum screen is slidably installed above the driving rod and the rotating rod, and a feeding port is fixedly installed above the right side of the mounting bracket. When the motor is started, the motor drives the driving rod to rotate, the driving rod drives the drum screen to rotate, and the drum screen drives the rotating rod to rotate, and sand is put into the feeding port. The sand enters the drum screen through the feeding port, and the drum screen temporarily retains the sand that does not meet the particle size requirements in the drum screen, and the sand that meets the particle size requirements falls into the hopper through the screen of the drum screen.

[0007] The cam is provided with a plurality of springs, and the springs are connected to the two guide rails respectively. A plurality of triangular scraping bars are arranged at the bottom. During the rotation of the drum screen, the drum screen drives the contact plate to rotate. During the rotation, the contact plate will contact the touch rod and push the touch rod with friction. The touch rod pushes the fixed rod to move to the right, and the fixed rod drives the scraper plate to move to the right. When the contact plate does not contact the touch rod, the scraper plate rebounds to the left due to the rebounder arranged on the sliding mounting rod, and the scraper plate drives the touch rod to reset through the fixed rod. Since a plurality of triangular scraping bars are arranged at the bottom of the scraper plate, when the scraper plate moves to the right, the sand temporarily retained in the drum screen will be pushed away by the tip of the triangular scraping bar, and when the scraper plate moves to the left, the sand temporarily retained in the drum screen will be pushed to the left by the plane of the triangular scraping bar.

[0008] According to the above technical solution, a cleaning device is arranged above the front side of the mounting bracket, and the cleaning device includes a cleaning plate, and the cleaning plate is fixedly mounted above the front side of the mounting bracket. A brush is arranged on the side of the cleaning plate close to the drum screen, and the brush is in contact with the outer wall of the drum screen. When the drum screen rotates, the brush arranged on the cleaning plate will brush off the sand attached to the outer wall of the drum screen.

[0009] According to the above technical solution, the cleaning device also includes multiple rebounders, multiple impact balls, a fixed plate, a toggle rod, and multiple convex balls. Multiple of the rebounders are fixedly installed on the upper surface of the cleaning plate, the fixed plate is fixedly connected to the end of the multiple rebounders away from the cleaning plate, and multiple of the impact balls are fixedly installed on the lower surface of the fixed plate. The toggle rod is fixedly installed on the right side of the fixed plate, the toggle rod is fixedly installed on the right side of the fixed plate, and multiple convex balls are fixedly installed on the right end of the drum screen. The end of the toggle rod is located on the movement trajectory of the convex ball, and the drum screen drives the convex ball to rotate during rotation. During the movement, the convex ball will contact the toggle rod, thereby pushing the toggle rod upward, and the toggle rod drives the fixed plate to move upward. When the convex ball does not contact the toggle rod, the fixed plate is affected by the rebounder and rebounds and resets. During the reset process, the fixed plate drives the impact ball to hit the surface of the cleaning plate.

[0010] According to the above technical solution, a dredging device 8 is provided at the rear side of the hopper 4, and the dredging device 8 includes an annular chute 81, an L-shaped slide bar 82, a slide plate 83, a hammer 84, a connecting rod 85, a connecting rod 86, and a U-shaped frame 87. The annular chute 81 is opened on the outer wall of the driving rod 6, one end of the L-shaped slide bar 82 is slidably installed on the inner wall of the annular chute 81, and the other end of the L-shaped slide bar 82 is hinged to the connecting rod 86. The slide plate 83 is fixedly installed on the outer wall of the hopper 4, the connecting rod 85 is hinged to the end of the connecting rod 86 away from the L-shaped slide bar 82, and the U-shaped frame 87 is fixedly connected to the outer wall of the hopper 4. The hammer 84 penetrates the inner wall of the driving rod 6. It is passed through and fixedly installed on the outer wall of the connecting rod 85, the surface of the L-shaped slide bar 82 is slidably connected to the inner wall of the slide groove plate 83, and the surface of the connecting rod 85 is slidably connected to the inner wall of the U-shaped frame 87. When the motor drives the driving rod to rotate, the driving rod drives the annular bevel to rotate. Since the L-shaped slide bar is horizontally limited by the slide groove plate, the annular bevel drives the L-shaped slide bar to perform horizontal reciprocating motion. Since the U-shaped frame limits the horizontal position of the connecting rod, the L-shaped slide bar drives the connecting rod to perform horizontal reciprocating motion through the connecting rod during the reciprocating motion, and the connecting rod drives the hammer to perform horizontal reciprocating motion. The hammer continuously strikes the outer wall of the hopper during the reciprocating motion.

[0011] According to the above technical solution, the dredging device also includes a threaded rod and blades. The threaded rod penetrates and is threadedly installed on the outer wall of the hopper. The threaded rod is rotatably connected to the connecting rod. The blades are fixedly installed on the end of the threaded rod away from the connecting rod. The connecting rod drives the threaded rod to perform horizontal reciprocating motion during the horizontal reciprocating motion. Since the threaded rod will rotate during the horizontal reciprocating motion, the threaded rod drives the blades to rotate while performing the horizontal reciprocating motion.

[0012] The present invention provides a construction concrete mixing equipment with sand screening function. It has the following beneficial effects: (1) The present invention arranges a mixer body, a drum screen, a feed port, a hopper, a mounting bracket, a motor, a driving rod, and a rotating rod, so that the drum screen temporarily retains sand that does not meet the particle size requirements in the drum screen, and sand that meets the particle size requirements falls into the hopper through the screen of the drum screen, thereby achieving the effect of screening sand. The screened sand falls into the mixer body through the hopper for mixing, thereby ensuring the quality of the material. The sliding mounting rod, the fixed rod, the scraper plate, the touch rod, and the resistance plate are arranged so that the scraper plate continuously pushes out the sand that does not meet the particle size requirements temporarily retained in the drum screen during the reciprocating motion, thereby avoiding excessive sand inside the drum screen that affects the sand screening efficiency, and also avoiding frequent cleaning by personnel, thereby achieving the effect of improving work efficiency.

[0013] (2) The present invention arranges a cleaning plate so that the brush arranged on the cleaning plate can brush off the sand attached to the outer wall of the drum screen, thereby preventing the sand attached to the outer wall from being thrown out of the hopper during the continuous rotation of the drum screen, thereby causing waste of materials. At the same time, continuously cleaning the mesh holes of the drum screen can prevent the drum screen from being clogged and affecting the sand screening efficiency. By arranging the rebounder, the impact ball, the fixed plate, the toggle rod, and the convex ball, the cleaning plate is vibrated by the impact of the impact ball, thereby shaking off the sand attached to the surface of the cleaning plate, thereby preventing the cleaning effect from being affected by too much sand attached to the surface of the cleaning plate.

[0014] (3) The present invention arranges an annular inclined groove, an L-shaped slide bar, a slide plate, a hammer, a connecting rod, a connecting rod, and a U-shaped frame, so that the hammer continuously strikes the outer wall of the hopper during the reciprocating motion, causing the hopper to continuously vibrate, thereby shaking off the sand attached to the inner wall of the hopper, thereby avoiding accumulation of sand attached to the inner wall of the hopper, thereby affecting subsequent work. The threaded rod and the blade are arranged so that the blade continuously guides the sand to fall through horizontal reciprocating motion and rotation inside the hopper, thereby avoiding accumulation of sand inside the hopper during use and affecting subsequent work, thereby achieving the effect of improving work efficiency and simplifying personnel operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the present invention as a whole; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 For the present invention Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a structural schematic diagram of the drum screen of the present invention; Figure 5 For the present invention Figure 4 The enlarged schematic diagram of point B in the middle; Figure 6 It is a structural schematic diagram of the cleaning device of the present invention; Figure 7 For the present invention Figure 6 An enlarged schematic view of part C in the present invention; Figure 8 A structural schematic diagram of the dredging device of the present invention.

[0016] In the figure: 1, mixer main body; 2, drum screen; 3, feed inlet; 4, hopper; 41, mounting bracket; 5, motor; 6, driving rod; 7, cleaning device; 71, cleaning plate; 72, rebounder; 73, impact ball; 74, fixing plate; 75, shifting rod; 76, convex ball; 8, dredging device; 81, annular inclined groove; 82, L-shaped sliding rod; 83, chute plate; 84, hammer; 85, connecting rod; 86, link; 87, U-shaped frame; 88, threaded rod; 89, blade; 9, rotating rod; 10, sliding mounting rod; 11, fixing rod; 12, scraping plate; 13, contact rod; 14, abutting plate. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Please refer to Figure 1-8 , an embodiment of the present invention is: a construction concrete mixing equipment with a sand screening function includes a mixer main body 1. A hopper 4 is fixedly installed behind the mixer main body 1. A mounting bracket 41 is fixedly installed above the hopper 4. A motor 5 is fixedly installed above the rear side of the mounting bracket 41. The output end of the motor 5 is fixedly connected to a driving rod 6. The driving rod 6 is rotatably installed above the rear side of the mounting bracket 41. A rotating rod 9 is rotatably installed above the front side of the mounting bracket 41. Drum screens 2 are slidably installed above both the driving rod 6 and the rotating rod 9. A feed inlet 3 is fixedly installed above the right side of the mounting bracket 41. Through the above structural arrangement, the drum screen 2 temporarily retains the sand that does not meet the particle size requirements in the drum screen 2, and the sand that meets the particle size requirements falls into the hopper 4 through the screen of the drum screen 2, thereby achieving the effect of screening sand. The screened sand falls into the mixer main body 1 through the hopper 4 for mixing, ensuring the quality of the materials.

[0019] According to the above technical solution, two sliding mounting rods 10 are fixedly installed on the upper surface of the mounting bracket 41, and multiple scraper plates 12 are slidably installed on the outer walls of the two sliding mounting rods 10. The inner walls of the multiple scraper plates 12 penetrate and are fixedly connected with fixed rods 11. The surface of the fixed rod 11 away from the end of the feed port 3 is fixedly connected with a touch rod 13. Two abutment plates 14 are fixedly installed on the inner wall of the drum screen 2. The middle sections of the two sliding mounting rods 10 are located inside the drum screen 2. Multiple limit blocks and springs are arranged on the outer walls of the two sliding mounting rods 10. One end of the spring is fixedly connected to the limit block, and the other end of the spring of the sliding mounting rod 10 is fixedly connected to the scraper plate 12. The touch rod 13 is located on the movement trajectory of the contact plate 14. A plurality of triangular scraping strips are arranged under the scraper plate 12. Through the arrangement of the above structure, the scraper plate 12 continuously pushes out the sand that does not meet the particle size requirements temporarily retained in the drum screen 2 during the reciprocating motion, thereby avoiding excessive sand inside the drum screen 2 affecting the sand screening efficiency, and also avoiding frequent cleaning by personnel, thereby achieving the effect of improving work efficiency.

[0020] When in use, the motor 5 is started, the motor 5 drives the driving rod 6 to rotate, the driving rod 6 drives the drum screen 2 to rotate, the drum screen 2 drives the rotating rod 9 to rotate, and the sand is put into the feed port 3, and the sand enters the drum screen 2 through the feed port 3. The drum screen 2 temporarily retains the sand that does not meet the particle size requirements in the drum screen 2, and the sand that meets the particle size requirements falls into the hopper 4 through the screen of the drum screen 2, thereby achieving the effect of screening the sand. The screened sand falls into the mixer body 1 through the hopper 4 for mixing, thereby ensuring the quality of the material; during the rotation of the drum screen 2, the drum screen 2 drives the contact plate 14 to rotate, and the contact plate 14 will contact the touch rod 13 during the rotation and push the touch rod 13 with friction, and the touch rod 13 pushes the fixed rod 11 to move to the right, and the fixed rod 11 drives the scraper plate 12 When the scraper plate 12 moves to the right, when the contact plate 14 does not contact the contact rod 13, the scraper plate 12 rebounds to the left due to the rebounder 72 provided on the sliding mounting rod 10, and the scraper plate 12 drives the contact rod 13 to reset through the fixed rod 11. Since a plurality of triangular scraping strips are provided under the scraper plate 12, when the scraper plate 12 moves to the right, the sand temporarily retained in the drum screen 2 will be pushed away by the tips of the triangular scraping strips, and when the scraper plate 12 moves to the left, the sand temporarily retained in the drum screen 2 will be pushed to the left by the plane of the triangular scraping strips, so that the scraper plate 12 continuously pushes out the sand that does not meet the particle size requirements temporarily retained in the drum screen 2 during the reciprocating motion, thereby avoiding excessive sand inside the drum screen 2 affecting the sand screening efficiency, and also avoiding frequent cleaning by personnel, thereby achieving the effect of improving work efficiency.

[0021] See also Figure 1-8On the basis of the above embodiment, in another embodiment of the present invention, a cleaning device 7 is provided above the front side of the mounting bracket 41, and the cleaning device 7 includes a cleaning plate 71, and the cleaning plate 71 is fixedly installed above the front side of the mounting bracket 41. A brush is provided on the cleaning plate 71 close to the side of the drum screen 2, and the brush is in contact with the outer wall of the drum screen. Through the arrangement of the above structure, the brush arranged on the cleaning plate 71 will brush off the sand attached to the outer wall of the drum screen 2, thereby preventing the sand attached to the outer wall of the drum screen 2 from being thrown out of the hopper 4 during the continuous rotation of the drum screen 2, resulting in a waste of materials. At the same time, continuously cleaning the mesh of the drum screen 2 can prevent the drum screen 2 from affecting the sand screening efficiency due to mesh blockage.

[0022] The cleaning device 7 also includes multiple rebounders 72, multiple impact balls 73, a fixed plate 74, a toggle rod 75, and multiple convex balls 76. The multiple rebounders 72 are fixedly mounted on the upper surface of the cleaning plate 71, the fixed plate 74 is fixedly connected to the end of the multiple rebounders 72 away from the cleaning plate 71, the multiple impact balls 73 are fixedly mounted on the lower surface of the fixed plate 74, the toggle rod 75 is fixedly mounted on the right side of the fixed plate 74, and the multiple convex balls 76 are fixedly mounted on the right end of the drum screen 2. The end of the toggle rod 75 is located on the movement trajectory of the convex balls 76. Through the arrangement of the above structure, the cleaning plate 71 is vibrated by the impact of the impact balls 73, thereby shaking off the sand attached to the surface of the cleaning plate 71, avoiding the cleaning effect of the cleaning plate 71 being affected by too much sand attached to the surface.

[0023] A dredging device 8 is provided at the rear side of the hopper 4, and the dredging device 8 includes an annular chute 81, an L-shaped slide bar 82, a slide plate 83, a hammer 84, a connecting rod 85, a connecting rod 86, and a U-shaped frame 87. The annular chute 81 is provided on the outer wall of the driving rod 6, one end of the L-shaped slide bar 82 is slidably mounted on the inner wall of the annular chute 81, and the other end of the L-shaped slide bar 82 is hinged to the connecting rod 86, the slide plate 83 is fixedly mounted on the outer wall of the hopper 4, the connecting rod 85 is hinged to the end of the connecting rod 86 away from the L-shaped slide bar 82, and the U-shaped frame 87 is fixedly connected to the connecting rod 86. On the outer wall of the hopper 4, the hammer 84 penetrates and is fixedly installed on the outer wall of the connecting rod 85, the surface of the L-shaped slide bar 82 is slidably connected to the inner wall of the slide plate 83, and the surface of the connecting rod 85 is slidably connected to the inner wall of the U-shaped frame 87. Through the arrangement of the above structure, the hammer 84 continuously strikes the outer wall of the hopper 4 during the reciprocating motion, so that the hopper 4 continuously vibrates to shake off the sand attached to the inner wall of the hopper 4, avoiding accumulation due to excessive sand attached to the inner wall of the hopper 4, thereby affecting subsequent work.

[0024] The dredging device 8 also includes a threaded rod 88 and a blade 89. The threaded rod 88 penetrates and is threadedly installed on the outer wall of the hopper 4. The threaded rod 88 is rotatably connected to the connecting rod 85. The blade 89 is fixedly installed on the end of the threaded rod 88 away from the connecting rod 85. Through the arrangement of the above structure, the blade 89 continuously guides the sand to fall inside the hopper 4 through horizontal reciprocating motion and rotation, thereby avoiding the accumulation of sand inside the hopper 4 during use and affecting subsequent work, thereby achieving the effect of improving work efficiency and simplifying personnel operation.

[0025] When in use, during the rotation of the drum screen 2, the brush arranged on the cleaning plate 71 will brush off the sand attached to the outer wall of the drum screen 2, preventing the drum screen 2 from throwing the sand attached to the outer wall out of the hopper 4 during the continuous rotation, resulting in material waste. At the same time, continuously cleaning the mesh of the drum screen 2 can prevent the drum screen 2 from being clogged and affecting the sand screening efficiency. The drum screen 2 drives the convex ball 76 to rotate during the rotation process. The convex ball 76 will contact the toggle rod 75 during the movement, thereby toggling the toggle rod 75 upward, and the toggle rod 75 drives the fixed plate 74 to move upward. When the convex ball 76 does not contact the toggle rod 75, the fixed plate 74 is affected by the rebounder 72 and rebounds to its original position. During the resetting process, the fixed plate 74 drives the impact ball 73 to impact the surface of the cleaning plate 71, so that the cleaning plate 71 vibrates through the impact of the impact ball 73, thereby shaking off the sand attached to the surface of the cleaning plate 71, avoiding that the cleaning plate 71 is affected by too much sand attached to the surface.

[0026] When the motor 5 drives the driving rod 6 to rotate, the driving rod 6 drives the annular chute 81 to rotate. Since the L-shaped slide bar 82 is horizontally limited by the slide plate 83, the annular chute 81 drives the L-shaped slide bar 82 to perform horizontal reciprocating motion. Since the U-shaped frame 87 horizontally limits the connecting rod 85, the L-shaped slide bar 82 drives the connecting rod 85 to perform horizontal reciprocating motion through the connecting rod 86 during the reciprocating motion. The connecting rod 85 drives the hammer 84 to perform horizontal reciprocating motion. The hammer 84 continuously strikes the outer wall of the hopper 4 during the reciprocating motion, causing the hopper 4 to continuously vibrate, thereby shaking off the sand attached to the inner wall of the hopper 4. , to avoid accumulation caused by excessive sand attached to the inner wall of the hopper 4, thereby affecting subsequent work; the connecting rod 85 drives the threaded rod 88 to perform horizontal reciprocating motion during the horizontal reciprocating motion. Since the threaded rod 88 will rotate during the horizontal reciprocating motion, the threaded rod 88 drives the blades 89 to rotate while performing horizontal reciprocating motion, so that the blades 89 continuously guide the sand to fall inside the hopper 4 through horizontal reciprocating motion and rotation, avoiding the accumulation of sand inside the hopper 4 during use and affecting subsequent work, thereby achieving the effect of improving work efficiency and simplifying personnel operation.

[0027] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention should cover within the protection scope of the present invention by making equivalent substitutions or changes according to the technical solution and inventive concept of the present invention.

Claims

1. A construction concrete mixing device with a sand screening function, comprising a mixer body (1), characterized in that: A hopper (4) is fixedly mounted at the rear of the mixer body (1); a mounting bracket (41) is fixedly mounted above the hopper (4); a motor (5) is fixedly mounted above the rear side of the mounting bracket (41); a driving rod (6) is fixedly connected to the output end of the motor (5); the driving rod (6) is rotatably mounted above the rear side of the mounting bracket (41); a rotating rod (9) is rotatably mounted above the front side of the mounting bracket (41); a drum screen (2) is slidably mounted above the driving rod (6) and the rotating rod (9); and a feed port (3) is fixedly mounted above the right side of the mounting bracket (41).

2. The construction concrete mixing equipment with sand screening function according to claim 1, characterized in that: Two sliding mounting rods (10) are fixedly mounted on the upper surface of the mounting bracket (41), and a plurality of scraper plates (12) are slidably mounted on the outer walls of the two sliding mounting rods (10). A fixing rod (11) penetrates and is fixedly connected to the inner walls of the plurality of scraper plates (12), and a contact rod (13) is fixedly connected to the surface of the fixing rod (11) at one end away from the feed port (3), and two contact plates (14) are fixedly mounted on the inner wall of the drum screen (2).

3. The construction concrete mixing equipment with sand screening function according to claim 2, characterized in that: The middle sections of the two sliding mounting rods (10) are located inside the drum screen (2), and the outer walls of the two sliding mounting rods (10) are provided with a plurality of limit blocks and springs, one end of the spring of the sliding mounting rod (10) is fixedly connected to the limit block, and the other end of the spring of the sliding mounting rod (10) is fixedly connected to the scraper plate (12), the contact rod (13) is located on the movement track of the contact plate (14), and a plurality of triangular scraper strips are provided below the scraper plate (12).

4. The construction concrete mixing equipment with sand screening function according to claim 3, characterized in that: A cleaning device (7) is arranged above the front side of the mounting bracket (41), and the cleaning device (7) comprises a cleaning plate (71). The cleaning plate (71) is fixedly mounted above the front side of the mounting bracket (41), and a brush is arranged on a side of the cleaning plate (71) close to the drum screen (2), and the brush is in contact with an outer wall of the drum screen (2).

5. The construction concrete mixing equipment with sand screening function according to claim 4, characterized in that: The cleaning device (7) further comprises a plurality of rebounders (72), a plurality of impact balls (73), a fixed plate (74), a toggle rod (75), and a plurality of convex balls (76); the plurality of rebounders (72) are fixedly mounted on the upper surface of the cleaning plate (71); the fixed plate (74) is fixedly connected to one end of the plurality of rebounders (72) away from the cleaning plate (71); the plurality of impact balls (73) are fixedly mounted on the lower surface of the fixed plate (74); the toggle rod (75) is fixedly mounted on the right side of the fixed plate (74); the plurality of convex balls (76) are fixedly mounted on one end of the right side of the drum screen (2); and the end of the toggle rod (75) is located on the movement trajectory of the convex balls (76).

6. The construction concrete mixing equipment with sand screening function according to claim 5, characterized in that: A dredging device (8) is provided at the rear side of the hopper (4), and the dredging device (8) comprises an annular chute (81), an L-shaped slide bar (82), a slide plate (83), a hammer (84), a connecting rod (85), a connecting rod (86), and a U-shaped frame (87). The annular chute (81) is opened on the outer wall of the driving rod (6), one end of the L-shaped slide bar (82) is slidably mounted on the inner wall of the annular chute (81), the other end of the L-shaped slide bar (82) is hinged to the connecting rod (86), the slide plate (83) is fixedly mounted on the outer wall of the hopper (4), the connecting rod (85) is hinged to the end of the connecting rod (86) away from the L-shaped slide bar (82), the U-shaped frame (87) is fixedly connected to the outer wall of the hopper (4), and the hammer (84) penetrates and is fixedly mounted on the outer wall of the connecting rod (85).

7. The construction concrete mixing equipment with sand screening function according to claim 6, characterized in that: The surface of the L-shaped sliding rod (82) is slidably connected to the inner wall of the sliding groove plate (83), and the surface of the connecting rod (85) is slidably connected to the inner wall of the U-shaped frame (87).

8. The construction concrete mixing equipment with sand screening function according to claim 7, characterized in that: The dredging device (8) further comprises a threaded rod (88) and a blade (89); the threaded rod (88) penetrates through and is threadedly mounted on the outer wall of the hopper (4); the threaded rod (88) is rotatably connected to the connecting rod (85); and the blade (89) is fixedly mounted on an end of the threaded rod (88) away from the connecting rod (85).

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