Concrete mixing equipment with sand screening function for road construction

Abstract

The invention discloses concrete stirring equipment with a sand screening function for road construction, and belongs to the technical field of stirring equipment. The supporting plates are fixedly connected to the two sides of the stirring box; the discharging channel is fixedly connected to the middle part of the stirring box; according to the automatic sand screening and conveying device for concrete mixing, through the arrangement of the sand screening barrel, the transmission mechanism and the feeding assembly, automatic screening and efficient conveying of sand in the concrete mixing process are achieved. Impurities in the sand are effectively separated through rotary motion of the sand screening barrel, and the purity of concrete raw materials is ensured; and the rotating shaft drives the baffle driven by the connecting rod mechanism to realize intermittent blanking control, so that material accumulation and blockage are avoided. And meanwhile, the reciprocating motion of the feeding plate in the inclination direction of the material guide plate further pushes the materials to be evenly conveyed into the sand screening barrel, the screening efficiency and the continuous operation capacity are remarkably improved, the overall structure is high in coordination, and operation is easy, convenient and reliable.

Description

Technical Field

[0001] This application relates to the technical field of mixing equipment, and more specifically, to a concrete mixing equipment for road construction with a sand screening function. Background Art

[0002] Concrete, abbreviated as "砼", refers to a general term for engineering composite materials in which aggregate is cemented into a whole by cementitious materials. Usually, the term "concrete" refers to cement concrete, which uses cement as the cementitious material, sand and stone as aggregate, and is mixed with water in a certain proportion. It is also called ordinary concrete and is widely used in civil engineering. For example, the Chinese patent publication number is CN112454663A, and the technical solution disclosed in this patent document is as follows: a concrete sand screening and mixing device, including a vertically arranged support installation cylinder, symmetrically arranged feeding installation cylinders at the upper end of the support installation cylinder, a variable-diameter material guiding cylinder at the lower end of the support installation cylinder, a mixing installation cylinder horizontally arranged at the lower right of the support installation cylinder, and an arc-shaped connecting cylinder connected to the lower end of the variable-diameter material guiding cylinder at the left end of the mixing installation cylinder. Inside the support installation cylinder below the rotating installation cover, rotating installation frames are symmetrically arranged. One end of each rotating installation frame is connected to the inner wall of the support installation cylinder through a rotating shaft. The following problems exist in the prior art: The above device cannot perform mixing after a certain amount of sand screening is achieved. Only after sufficient sand screening is completed can the mixing efficiency be ensured. The sand for sand screening in this device is gradually added to the concrete rather than added一次性 (this part seems incorrect in the original Chinese, assuming it should be "一次性" which might mean "at once" in English), which will slow down the overall production efficiency. This goes against the original intention of integration to improve efficiency. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a concrete mixing equipment for road construction with a sand screening function, which solves the problems raised in the above background art.

[0004] To achieve the above object, the present application provides a concrete mixing equipment for road construction with a sand screening function, including: a mixing tank; a support plate fixedly connected to both sides of the mixing tank; a feeding channel fixedly connected to the middle of the mixing tank. A sand screening cylinder is rotatably connected to the upper end of the feeding channel. A C-shaped plate is fixedly connected to the upper end of the mixing tank. A transmission shaft is rotatably connected to the inner side of the C-shaped plate. A mounting plate is fixedly connected to the outer wall of the C-shaped plate. A rotating shaft is rotatably connected to the outer wall of the mounting plate. One end of the transmission shaft penetrates through the C-shaped plate and is fixedly connected to a driving pulley A. A driving pulley B is fixedly sleeved on the outer wall of the rotating shaft. A transmission belt is wound around the outer walls of the driving pulley A and the driving pulley B. A connecting rod is fixedly connected to the outer wall of the rotating shaft, and the other end of the connecting rod is fixedly connected to the inner wall of the sand screening cylinder. A guide plate is fixedly connected to the upper end of the mixing tank. A connecting rod A is fixedly connected to one end of the rotating shaft, and a connecting rod B is hinged to the other end of the connecting rod A via a pin. A baffle is hinged to the other end of the connecting rod B. A fixing plate is fixedly connected to the upper end of the mixing tank. An inclined groove is formed on the outer wall of the fixing plate, and a sliding shaft is slidably connected inside the inclined groove. A feeding plate is fixedly connected to the other end of the sliding shaft. A connecting shaft is fixedly connected to the side of the baffle, and a connecting rod C is rotatably connected to the other end of the connecting shaft. A rectangular frame A is hinged to the other end of the connecting rod C.

[0005] Preferably, the upper end of the guide plate is provided with a through groove, and the baffle slides through the through groove.

[0006] Preferably, the outer wall of the sliding shaft is slidably connected to the interior of the rectangular frame A.

[0007] Preferably, the inclination degree of the guide plate is consistent with the inclination angle of the chute.

[0008] Preferably, the external part of the feeding channel is equipped with an opening and closing assembly, which includes an elastic telescopic rod. The elastic telescopic rod is fixedly connected to the inside of the mixing tank. A connecting block is fixedly connected to the bottom of the elastic telescopic rod. An installation groove is provided on the side of the connecting block. An installation shaft is rotatably connected to the inner wall of the installation groove. An installation block is fixedly sleeved on the outer wall of the installation shaft. A cover plate is fixedly connected to the outer wall of the installation block. A fixing block is fixedly connected to the bottom of the cover plate. A receiving groove is provided on the inner side of the fixing block. A locking block is slidably connected to the inner wall of the receiving groove. A linkage shaft is fixedly connected to the outer wall of the locking block. A moving rod is fixedly connected to the bottom of the rectangular frame A. One end of the moving rod slides through the mixing tank.

[0009] Preferably, a spring A is fixedly connected to the inner wall of the receiving groove, and the other end of the spring A is fixedly connected to the locking block.

[0010] Preferably, a torsion spring is movably sleeved on the outer wall of the mounting shaft, and the two ends of the torsion spring are fixedly connected to the inner wall of the mounting groove and the side of the mounting block, respectively.

[0011] Preferably, the upper surface of the card block is set as an inclined surface.

[0012] Preferably, the mounting plate is externally fitted with a striking assembly, which includes a striking belt fixedly connected to the outer wall of the drive shaft. A gear A is fixedly sleeved on the outer wall of the drive shaft. A rotating rod is rotatably connected to the outer wall of the mounting plate. A brush and a gear B are fixedly sleeved on the outer wall of the rotating rod.

[0013] Preferably, gear B is located on the side of gear A and meshes with it.

[0014] The advantages of this application are: (1) This application achieves automatic screening and efficient conveying of sand during concrete mixing by setting up a sand screening cylinder, a transmission mechanism and a feeding assembly. The rotation of the sand screening cylinder effectively separates impurities in the sand, ensuring the purity of the concrete raw materials; while the baffle driven by the rotating shaft and the linkage mechanism realizes intermittent feeding control, avoiding material accumulation and blockage. At the same time, the reciprocating motion of the feeding plate along the inclined direction of the guide plate further promotes the material to be evenly conveyed into the sand screening cylinder, significantly improving screening efficiency and continuous operation capability. The overall structure is highly coordinated and the operation is simple and reliable.

[0015] (2) This application achieves automatic sand accumulation sensing and controllable sand feeding by adding an opening and closing component to the outside of the feeding channel. The elastic telescopic rod and cover plate structure can automatically adjust the height according to the weight of the sand, and trigger the locking block to release the limit through the cooperation of the moving rod and the linkage shaft, so that the cover plate rotates and opens and closes under the action of gravity, realizing the intermittent feeding of sand. This design effectively avoids the problem of uneven mixing caused by a large amount of sand rushing into the mixing tank at one time. At the same time, the reset mechanism of the torsion spring and spring A ensures the timely closing and limit restoration of the cover plate, improving the stability of the mixing process and the quality of concrete.

[0016] (3) This application further optimizes the anti-clogging function of the sand screening cylinder by adding a striking component and a brushing mechanism. When the striking belt rotates with the drive shaft, it periodically strikes the outer wall of the sand screening cylinder, generating a vibration effect that effectively shakes off particles clogging the screen holes; at the same time, the gear transmission drives the brush cylinder to rotate, and its bristles continuously clean the inner wall of the sand screening cylinder. The dual effect significantly improves screening efficiency and continuity. This structure is reasonably designed, requires no additional power source, and can achieve automatic unclogging by relying on the existing transmission system, extending the service life of the equipment and reducing maintenance costs. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is the invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a partial cross-sectional structural schematic diagram of the present invention; Figure 6 This is the invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is the invention Figure 5 Enlarged structural diagram at point C.

[0018] In the above image, 1. Mixing tank; 2. Support plate; 3. Discharge channel; 41. Sand screening cylinder; 42. C-shaped plate; 43. Drive shaft; 44. Mounting plate; 45. Drive wheel A; 46. Rotating shaft; 47. Drive wheel B; 48. Drive belt; 49. Connecting rod; 410. Guide plate; 411. Connecting rod A; 412. Connecting rod B; 413. Baffle; 414. Fixing plate; 415. Inclined chute; 416. Sliding shaft; 417. Feeding plate; 418. Connecting shaft; 419. 1. Linkage C; 420. Rectangular frame A; 5. Opening and closing assembly; 51. Elastic telescopic rod; 52. Connecting block; 53. Mounting slot; 54. Mounting shaft; 55. Cover plate; 56. Fixing block; 57. Receiving slot; 58. Locking block; 59. Linkage shaft; 510. Moving rod; 511. Spring A; 512. Torsion spring; 513. Mounting block; 6. Striking assembly; 61. Striking belt; 62. Gear A; 63. Gear B; 64. Rotating rod; 65. Brush cylinder. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1, please refer to Figures 1-4 This embodiment provides a concrete mixing equipment for road construction with sand screening function, including: a mixing tank 1; a support plate 2, the support plate 2 being fixedly connected to both sides of the mixing tank 1; and a discharge channel 3, the discharge channel 3 being fixedly connected to the middle of the mixing tank 1; A sand screening cylinder 41 is rotatably connected to the upper end of the feeding channel 3. A U-shaped plate 42 is fixedly connected to the upper end of the mixing tank 1. A drive shaft 43 is rotatably connected to the inner side of the U-shaped plate 42. A mounting plate 44 is fixedly connected to the outer wall of the U-shaped plate 42. A rotating shaft 46 is rotatably connected to the outer wall of the mounting plate 44. One end of the drive shaft 43 passes through the U-shaped plate 42 and is fixedly connected to a drive wheel A45. A drive wheel B47 is fixedly sleeved on the outer wall of the rotating shaft 46. A drive belt 48 is wound around the outer walls of the drive wheels A45 and B47. A connecting rod 49 is fixedly connected to the outer wall of the rotating shaft 46. The other end of the connecting rod 49 is fixedly connected to the inner wall of the sand screening cylinder 41. The upper end of the mixing tank 1... A guide plate 410 is fixedly connected. One end of the rotating shaft 46 is fixedly connected to a connecting rod A411. The other end of the connecting rod A411 is hinged to a connecting rod B412 via a pin. The other end of the connecting rod B412 is hinged to a baffle 413. A fixed plate 414 is fixedly connected to the upper end of the mixing tank 1. An inclined groove 415 is opened on the outer wall of the fixed plate 414. A sliding shaft 416 is slidably connected inside the inclined groove 415. A feeding plate 417 is fixedly connected to the other end of the sliding shaft 416. A connecting shaft 418 is fixedly connected to the side of the baffle 413. A connecting rod C419 is rotatably connected to the other end of the connecting shaft 418. A rectangular frame A420 is hinged to the other end of the connecting rod C419.

[0026] The upper end of the guide plate 410 is provided with a through groove, and the baffle 413 slides through the through groove. The through groove has a specific size and shape, which allows the baffle 413 to slide through it.

[0027] The outer wall of the sliding shaft 416 is slidably connected to the interior of the rectangular frame A420, ensuring that the contact surfaces between the two remain in close contact, thereby achieving smooth and stable relative movement. The inclination degree of the guide plate 410 is consistent with the inclination angle of the chute 415.

[0028] In use, firstly, a motor is installed on the outside of the C-shaped plate 42, so that the output end of the motor rotates with the transmission shaft 43. Then, the motor is started so that its output end drives the transmission shaft 43 to rotate. During the rotation, the transmission shaft 43 drives the transmission wheel A45 to rotate synchronously. The transmission wheel A45 drives the transmission wheel B47 to rotate through the transmission belt 48, which in turn causes the rotating shaft 46 to rotate. The rotating shaft 46 drives the connecting rod 49 to rotate, and the connecting rod 49 drives the sand screening cylinder 41 to rotate and screen at the upper end of the feeding channel 3. At the same time, the rotation of the shaft 46 will also drive the connecting rod A411 to rotate around the shaft 46. Then, one end of the connecting rod B412, which is hinged to the other end of the connecting rod A411, will rotate around the shaft 46. While the connecting rod B412 is rotating, the height of its other end will change. Then, the connecting rod B412 will drive the baffle 413, which is hinged to its other end, to slide up and down in the through groove of the guide plate 410, thereby realizing the intermittent blocking and release of materials on the guide plate 410. Furthermore, the movement of the baffle 413 will drive one end of the connecting rod C419 to move up and down via the connecting shaft 418. Then, the rectangular frame A420, which is hinged to the other end of the connecting rod C419, will move left and right. In turn, the rectangular frame A420 can drive the sliding shaft 416 to slide in the inclined groove 415. Then, the feeding plate 417 moves along the inclined direction of the guide plate 410, thereby pushing the material into the sand screening cylinder 41 and improving the screening efficiency.

[0029] Example 2, please refer to Figures 1-7 Based on Example 1, an opening and closing assembly 5 is assembled on the outside of the feeding channel 3. The opening and closing assembly 5 includes an elastic telescopic rod 51, which is fixedly connected to the inside of the mixing tank 1. A connecting block 52 is fixedly connected to the bottom of the elastic telescopic rod 51. An installation groove 53 is provided on the side of the connecting block 52. An installation shaft 54 ​​is rotatably connected to the inner wall of the installation groove 53. An installation block 513 is fixedly sleeved on the outer wall of the installation shaft 54. A cover plate 55 is fixedly connected to the outer wall of the installation block 513. A fixing block 56 is fixedly connected to the bottom of the cover plate 55. A receiving groove 57 is provided on the inner side of the fixing block 56. A locking block 58 is slidably connected to the inner wall of the receiving groove 57. A linkage shaft 59 is fixedly connected to the outer wall of the locking block 58. A moving rod 510 is fixedly connected to the bottom of the rectangular frame A420. One end of the moving rod 510 slides through the mixing tank 1.

[0030] A spring A511 is fixedly connected to the inner wall of the receiving groove 57. The other end of the spring A511 is fixedly connected to the locking block 58. The spring A511 can produce a certain elastic deformation, so that the locking block 58 can move within a certain range. At the same time, it can quickly return to its original position after the external force disappears, ensuring the normal operation of the entire device.

[0031] A torsion spring 512 is movably sleeved on the outer wall of the mounting shaft 54. Both ends of the torsion spring 512 are fixedly connected to the inner wall of the mounting groove 53 and the side of the mounting block 513, respectively, enabling the torsion spring 512 to effectively transmit torque and provide a rebound force when needed. The upper surface of the locking block 58 is set as an inclined surface, so that when the two side covers 55 are closed, the upper inclined surface of the locking block 58 and the fixing block 56 on the other side can retract into the receiving groove 57. When in use, after the screened sand enters the material feeding channel 3, it will accumulate at the top of the cover plate 55. As the sand accumulates more and more, the gravity of the sand will gradually overcome the elastic force of the elastic telescopic rod 51, causing the connecting block 52, the mounting block 513 and the cover plate 55 to move downward as a whole. Then the fixing block 56, the locking block 58 and the linkage shaft 59 at the bottom of the cover plate 55 will also descend at the same time. After descending to a certain height, the linkage shaft 59 will move to the trajectory of the moving rod 510. At this time, as the rectangular frame A420 moves left and right, it will drive the moving rod 510 to reciprocate in the left and right directions. When the moving rod 510 moves to the left, its protruding part will contact the linkage shaft 59, thereby pushing the linkage shaft 59 to slide into the receiving groove 57. The linkage shaft 59 drives the locking block 58 to compress the spring A511 and retract into the receiving groove 57. At this time, the limiting effect of the locking block 58 on the cover plate 55 is released. Under the action of gravity, the mounting block 513 drives the cover plate 55 to rotate around the mounting shaft 54 ​​and open, allowing the accumulated sand to fall into the mixing tank 1 through the discharge channel 3. When the moving rod 510 moves to the right and disengages from the linkage shaft 59, the spring A511 pushes the locking block 58 to reset. At the same time, after the sand is reduced, the elastic telescopic rod 51 drives the connecting block 52 and the cover plate 55 to move upward as a whole. Under the action of the torsion spring 512, the cover plate 55 rotates in the opposite direction and closes. The locking block 58 re-limits the cover plate 55, realizing the intermittent opening and closing of the feeding channel 3, and avoiding the sand from rushing into the mixing box 1 in a large amount at one time, which would cause uneven mixing.

[0032] Example 3, please refer to Figures 1-7 Based on Embodiment 1, a striking assembly 6 is mounted on the outside of the mounting plate 44. The striking assembly 6 includes a striking belt 61, which is fixedly connected to the outer wall of the drive shaft 43. A gear A62 is fixedly sleeved on the outer wall of the rotating shaft 46. A rotating rod 64 is rotatably connected to the outer wall of the mounting plate 44. A brush cylinder 65 and a gear B63 are fixedly sleeved on the outer wall of the rotating rod 64. The gear B63 is located on the side of the gear A62 and meshes with it. The teeth of the two are in close contact, ensuring efficient cooperation and stable performance during transmission.

[0033] When in use, the drive shaft 43 rotates, driving the striking belt 61 to rotate synchronously. During the rotation, the striking belt 61 will intermittently contact the outer wall of the sand screening cylinder 41 and produce a striking action, causing the sand screening cylinder 41 to vibrate, preventing sand from clogging in the screen holes of the sand screening cylinder 41, and ensuring the smooth progress of the screening process. At the same time, the rotation of the shaft 46 drives the gear A62 to rotate. Since the gear B63 meshes with the gear A62, the gear A62 will drive the gear B63 and the rotating rod 64 to rotate synchronously. The rotating rod 64 drives the brush cylinder 65 to rotate. The bristles of the brush cylinder 65 contact the inner wall of the sand screening cylinder 41 to clean the sand attached to the outer wall of the sand screening cylinder 41, further preventing the screen holes from clogging and improving the sand screening efficiency.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A concrete mixing device for road construction with sand screening function, characterized in that, include: Mixing tank; Support plates are fixedly connected to both sides of the mixing tank; A feeding channel is fixedly connected to the middle of the mixing tank; A sand screening cylinder is rotatably connected to the upper end of the feeding channel. A U-shaped plate is fixedly connected to the upper end of the mixing tank. A drive shaft is rotatably connected to the inner side of the U-shaped plate. A mounting plate is fixedly connected to the outer wall of the U-shaped plate. A rotating shaft is rotatably connected to the outer wall of the mounting plate. One end of the drive shaft passes through the U-shaped plate and is fixedly connected to a drive wheel A. A drive wheel B is fixedly sleeved on the outer wall of the rotating shaft. A drive belt is wound around the outer walls of drive wheel A and drive wheel B. A connecting rod is fixedly connected to the outer wall of the rotating shaft, and the other end of the connecting rod is fixedly connected to the inner wall of the sand screening cylinder. A guide plate is fixedly connected to the upper end of the mixing tank. A connecting rod A is fixedly connected to one end of the rotating shaft, and a connecting rod B is hinged to the other end of the connecting rod A via a pin. A baffle is hinged to the other end of the connecting rod B. A fixing plate is fixedly connected to the upper end of the mixing tank. An inclined groove is formed on the outer wall of the fixing plate, and a sliding shaft is slidably connected inside the inclined groove. A feeding plate is fixedly connected to the other end of the sliding shaft. A connecting shaft is fixedly connected to the side of the baffle, and a connecting rod C is rotatably connected to the other end of the connecting shaft. A rectangular frame A is hinged to the other end of the connecting rod C.

2. The concrete mixing equipment for road construction with sand screening function according to claim 1, characterized in that, The upper end of the guide plate is provided with a through groove, and the baffle slides through the through groove.

3. A concrete mixing device for road construction with sand screening function according to claim 1, characterized in that, The outer wall of the sliding shaft is slidably connected to the inside of the rectangular frame A.

4. A concrete mixing device for road construction with sand screening function according to claim 1, characterized in that, The inclination of the guide plate is consistent with the inclination angle of the chute.

5. A concrete mixing device for road construction with sand screening function according to claim 1, characterized in that, The material feeding channel is externally equipped with an opening and closing assembly, which includes an elastic telescopic rod. The elastic telescopic rod is fixedly connected to the inside of the mixing tank. A connecting block is fixedly connected to the bottom of the elastic telescopic rod. An installation groove is provided on the side of the connecting block. An installation shaft is rotatably connected to the inner wall of the installation groove. An installation block is fixedly sleeved on the outer wall of the installation shaft. A cover plate is fixedly connected to the outer wall of the installation block. A fixing block is fixedly connected to the bottom of the cover plate. A receiving groove is provided on the inner side of the fixing block. A locking block is slidably connected to the inner wall of the receiving groove. A linkage shaft is fixedly connected to the outer wall of the locking block. A moving rod is fixedly connected to the bottom of the rectangular frame A. One end of the moving rod slides through the mixing tank.

6. A concrete mixing device for road construction with sand screening function according to claim 5, characterized in that, A spring A is fixedly connected to the inner wall of the receiving groove, and the other end of the spring A is fixedly connected to the locking block.

7. A concrete mixing device for road construction with sand screening function according to claim 6, characterized in that, A torsion spring is movably sleeved on the outer wall of the mounting shaft, and the two ends of the torsion spring are fixedly connected to the inner wall of the mounting groove and the side of the mounting block, respectively.

8. A concrete mixing device for road construction with sand screening function according to claim 7, characterized in that, The upper surface of the card block is set as an inclined plane.

9. A concrete mixing device for road construction with sand screening function according to claim 1, characterized in that, The mounting plate is externally fitted with a striking assembly, which includes a striking belt. The striking belt is fixedly connected to the outer wall of the drive shaft. Gear A is fixedly sleeved on the outer wall of the drive shaft. A rotating rod is rotatably connected to the outer wall of the mounting plate. A brush and gear B are fixedly sleeved on the outer wall of the rotating rod.

10. A concrete mixing device for road construction with sand screening function according to claim 1, characterized in that, Gear B is located on the side of gear A and meshes with it.

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