Fresh concrete screening and washing device

Abstract

The utility model discloses a fresh concrete screening and washing device which at least comprises two layers of screen drums, a first screen drum is arranged in a second screen drum, and screen holes of the first screen drum are larger than those of the second screen drum, so that the first screen drum and the second screen drum rotate synchronously, primary screening of concrete can be achieved in the first screen drum, and secondary screening of concrete can be achieved in the second screen drum. Large-particle-size particles are screened and stored in the first screen drum, secondary screening is synchronously achieved in the second screen drum, small-particle-size particles are screened and stored in the collecting tank, particles of various size fractions are synchronously screened, meanwhile, the screen drums are horizontally arranged, two-time screening can be achieved under the action of gravity, energy consumption is effectively reduced, and it is ensured that screening work is stable and reliable. Furthermore, the end portion of the rotating shaft is connected with a water inlet pipe and / or an air inlet pipe, jet orifices are distributed on the rotating shaft, water is synchronously jetted to enable particles to be easy to deslim, the particles are cleaned, hot air is jetted, the particles can be dried in the screen drum, collection and weighing of the particles are facilitated, the screening effect is further improved, and the reliability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of concrete screening technology, specifically to concrete screening and washing technology. Background Technology

[0002] In order to control the quality and strength of concrete, it is usually necessary to screen the particles of a certain size in the concrete. In the existing technology, rotating drums or conveyor belts are usually used to screen the concrete particles.

[0003] Chinese Patent No. CN 217043370 U discloses a concrete aggregate screening device, including an outer screen cylinder and an inner screen cylinder nested together. Several screen holes are correspondingly opened on the outer walls of both cylinders, with two screen holes at the same position forming an overlap zone from which particles are screened out. However, this screening device can only screen concrete once, obtaining particles of one particle size, making it impossible to effectively control the quality of the concrete. Furthermore, when the concrete rotates and is screened in the device, the particles are not easily deslimed, resulting in unstable screening performance.

[0004] Chinese patent application CN 109946191 A also discloses a concrete screening device, including a vertical bin containing a coarse aggregate screening device and a fine aggregate screening device. The fine aggregate screening device is located outside the coarse aggregate screening device. The bin is rotated by a centrifugal device to screen out fine and coarse aggregates. However, this screening device screens concrete particles by centrifugal force, which not only consumes a lot of energy but also has unstable operation and is prone to screening failure.

[0005] Therefore, how to effectively improve the screening effect of concrete, simultaneously screen out particles of multiple sizes, ensure the reliability and stability of screening, and thus effectively control the quality of concrete has become an urgent problem to be solved in this field. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a fresh concrete screening and washing device that can simultaneously screen out particles of multiple particle sizes, improve screening effect, and is stable and reliable.

[0007] To achieve the above objectives, the present invention provides a fresh concrete screening and washing device, comprising a screen cylinder assembly, wherein the screen cylinder assembly includes at least two interconnected and horizontally arranged screen cylinders.

[0008] A first screen cylinder is built inside a second screen cylinder. The first screen cylinder is configured to accommodate concrete within it. The screen openings of the first screen cylinder are larger than those of the second screen cylinder, and the first and second screen cylinders are coaxially connected via a rotating shaft.

[0009] The rotating shaft passes through the first screen cylinder and the second screen cylinder at both ends, respectively. The first end is connected to a drive motor, and the second end is connected to a water inlet pipe and / or an air inlet pipe. Spray nozzles are distributed on the rotating shaft.

[0010] The bottom of the second screen cylinder is provided with a collection trough and a discharge port.

[0011] Furthermore, the first circumferential surface and the first end surface of the first screen cylinder are respectively formed with first screen holes, and a feed inlet is formed on the first circumferential surface. The feed inlet is provided with a feed gate that can be locked and unlocked.

[0012] Furthermore, a second screen hole is formed on the second circumferential surface of the second screen cylinder, the second end face of the second screen cylinder is formed by a mounting plate, and an operating port is formed on the second circumferential surface, wherein the operating port is provided with an operating door that can be locked and unlocked.

[0013] Furthermore, the feed door and the operating door are respectively connected to the feed port and the operating port by snap-fit ​​connections.

[0014] Furthermore, the lower region of the second sieve cylinder is built into the collection trough, and the top of the collection trough is provided with a rotating groove for cooperating with the rotating shaft.

[0015] Furthermore, the collecting trough is configured as a U-shaped trough, and the discharge port is formed in the middle of the bottom surface.

[0016] Furthermore, a water storage tank or a drain pipe is installed below the discharge port.

[0017] Furthermore, a weighing device is installed below the discharge port.

[0018] Furthermore, the drive motor is located outside the collection tank and is connected to the collection tank via a mounting bracket.

[0019] Furthermore, the collection trough is provided with a rotatable protective cover, which covers the second sieve cylinder.

[0020] The present invention provides a fresh concrete screening and washing device, which includes at least two screen cylinders. The first screen cylinder is built inside the second screen cylinder. The first screen cylinder contains concrete, and the screen openings of the first screen cylinder are larger than those of the second screen cylinder. This allows the first and second screen cylinders to rotate synchronously via a rotating shaft. The concrete can be screened once in the first screen cylinder, where large-diameter particles are screened and stored. The remaining concrete enters the second screen cylinder, where a second screening is performed simultaneously, where small-diameter particles are screened and stored in a collection trough. This achieves simultaneous screening of multiple particle sizes and improves the screening effect.

[0021] Meanwhile, the screen cylinders of this device are arranged horizontally, and the first screen cylinder and the second screen cylinder rotate synchronously through a rotating shaft, which can achieve two screenings under the action of gravity, effectively reducing energy consumption and ensuring the stability and reliability of the screening operation.

[0022] Furthermore, the end of the rotating shaft is connected to a water inlet pipe and / or an air inlet pipe, and spray nozzles are also distributed on the rotating shaft. During the screening and washing stage, water is sprayed synchronously into the first and second screen cylinders through the rotating shaft, which makes it easy to remove mud from the particles and wash them clean, thereby improving the screening effect. After screening and washing, hot air is sprayed into the first and second screen cylinders through the rotating shaft, which dries the particles in the screen cylinders, making it easier to collect and weigh the particles, further improving the screening effect and the reliability of the device. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 Front sectional view of the fresh concrete screening and washing device provided by this utility model;

[0025] Figure 2 Side sectional view of the fresh concrete screening and washing device provided by this utility model;

[0026] Figure 3 Top sectional view of the fresh concrete screening and washing device provided by this utility model;

[0027] Figure 4a and 4b This is a schematic diagram of the structure of the first and second sieve cylinders in this utility model;

[0028] Figure 5 This is a schematic diagram of the spray nozzle structure in this utility model;

[0029] Figure 6 This is a schematic diagram of the collection tank in Embodiment 2 of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. First screen cylinder; 11. First circumferential surface; 12. First end face; 13. First screen hole; 14. Feed inlet; 15. Feed gate;

[0032] 2. Second sieve cylinder; 21. Second circumferential surface; 22. Second sieve hole; 23. Second end face; 24. Operating port; 25. Operating door;

[0033] 3. Rotating shaft; 31. First end; 32. Second end; 33. Injection nozzle;

[0034] 4. Drive motor; 41. Mounting base; 5. Water inlet pipe; 6. Air inlet pipe; 7. Collection tank; 71. Bottom surface; 72. Rotating groove; 73. Screen; 74. Water receiving tray; 75. Water receiving hole; 8. Discharge port; 9. Protective cover. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0036] Example 1

[0037] See Figures 1 to 3 The image shows an example of a fresh concrete screening and washing device provided by this utility model.

[0038] As shown in the figure, the fresh concrete screening and washing device in this example includes a screen cylinder assembly, and the screen cylinder assembly includes at least two layers of screen cylinders that are nested together and arranged horizontally. The fresh concrete screening and washing device in this example includes a first screen cylinder 1 and a second screen cylinder 2.

[0039] The first screen cylinder 1 is built inside the second screen cylinder 2. The first screen cylinder 1 is configured to accommodate concrete. The screen openings of the first screen cylinder 1 are larger than those of the second screen cylinder 2. The first screen cylinder 1 and the second screen cylinder 2 are coaxially connected by a rotating shaft 3, so that the first screen cylinder 1 and the second screen cylinder 2 can rotate synchronously through the rotating shaft 3. During the rotation, the two screens are screened twice under the action of gravity, thereby obtaining at least two particle sizes, ensuring the stability and reliability of the screening, and improving the screening effect.

[0040] Furthermore, the two ends of the rotating shaft 3 pass through the first screen cylinder 1 and the second screen cylinder 2 respectively. The first end 31 is connected to the drive motor 4, and the second end 32 is connected to the water inlet pipe 5 and / or the air inlet pipe 6. The rotating shaft 3 is equipped with spray nozzles 33, which allows the rotating shaft 3 to spray water synchronously during rotation, making it easier for the particles to be desludged and washed. It can also spray hot air after screening to dry the particles, thereby improving the screening effect.

[0041] Furthermore, the bottom of the second screen cylinder 2 is provided with a collection trough 7 and a discharge port 71, which can drain water and collect the sieved particles.

[0042] Combination Figures 1 to 3 The first circumferential surface 11 and the first end surface 12 of the first screen cylinder 1 are respectively formed with first screen holes 13, so that the concrete is contained in the first screen cylinder 1. When the first screen cylinder 1 rotates, the particles in the concrete can be screened once from each surface of the first screen cylinder 1 to improve the screening effect.

[0043] Meanwhile, each surface of the first screen cylinder 1 has a first screen hole 13, and the water and / or hot air sprayed by the rotating shaft 3 can be quickly and evenly distributed in the first screen cylinder 1 to improve the desliming efficiency, washing efficiency and drying efficiency of the particles.

[0044] Combination Figure 4a and 4b Furthermore, a feed inlet 14 is formed on the first peripheral surface 11, and a feed gate 15 that can be locked and unlocked is provided on the feed inlet 14. Preferably, the feed gate 15 is connected to the feed inlet 14 by a snap-fit, which facilitates the quick locking and unlocking of the feed gate 15. A first screen hole 13 is also formed on the feed gate 15, so that when the feed gate 5 is opened, concrete can be placed in the first screen cylinder 1 through the feed inlet 14, and then the feed gate 15 is locked to close the feed inlet 14, preventing the concrete from being thrown out during the rotation of the first screen cylinder 1. At the same time, the particles in the concrete can also be screened once through the first screen hole 13 on the feed gate 15 to improve the screening effect.

[0045] In addition, the feed gate 15 is also configured to be compatible with the feed inlet 14 and cooperate with the first circumferential surface 11 when locked, forming a complete circumferential surface, so that the structure of the first screen cylinder 1 is complete, and it is also convenient for the first screen cylinder 1 and the second screen cylinder 2 to rotate synchronously and not to collide due to the feeding of concrete.

[0046] Combination Figure 4a and 4b Correspondingly, a second sieve hole 22 is formed on the second circumferential surface 21 of the second sieve cylinder 2, and the diameter of the second sieve hole 22 is smaller than that of the first sieve hole 13. The second end face 23 of the second sieve cylinder 2 is formed by a mounting plate, such as... Figure 2 As shown, the second screen cylinder 2 can be stably connected and cooperated with the rotating shaft 3 through the mounting plate. At the same time, the concrete remaining after the first screening of the first screen cylinder 1 is screened again in the second screen cylinder 2 through the second screen hole 22 on the second circumferential surface 21. The particles will not be screened out from the second end face 23, so as to limit the falling direction of the particles and ensure that the particles can only fall along the second circumferential surface 21 for easy collection.

[0047] Similarly, an operating opening 24 is formed on the second circumferential surface 21 of the second screen cylinder 2. The operating opening 24 is provided with a lockable and unlockable operating door 25. Preferably, the operating door 25 and the operating opening 24 are connected by a snap-fit, which facilitates the quick locking and unlocking of the operating door 25. A second screen hole 22 is also formed on the operating door 25, so that the first screen cylinder 1 can be operated by opening the operating door 25, which facilitates the feeding of concrete. Locking the operating door 25 can ensure the stability of the screening operation. At the same time, the particles in the concrete can also be screened a second time through the second screen hole 22 on the operating door 25 to improve the screening effect.

[0048] In addition, the operating door 25 is also configured to be compatible with the operating port 24 and cooperate with the second circumferential surface 21 when locked, forming a complete circumferential surface, so as to realize the structural integrity of the second screen cylinder 2 and facilitate the cooperation between the second screen cylinder 2 and the collection tank 7 and the rotating shaft 3.

[0049] Combination Figures 1 to 3 The first screen cylinder 1 and the second screen cylinder 2 thus form a combination. The length and diameter of the first screen cylinder 1 are smaller than those of the second screen cylinder 2, so that it can be built into the second screen cylinder 2. It is preferably configured to be concentrically distributed, and the first screen cylinder 1 and the second screen cylinder 2 are respectively passed through the two ends of the rotating shaft 3, so that the first screen cylinder 1 and the second screen cylinder 2 can rotate synchronously through the rotating shaft 3, and the concrete is screened twice synchronously during the rotation.

[0050] Specifically, concrete is placed in the first screen cylinder 1. As the first screen cylinder 1 and the second screen cylinder 2 rotate synchronously, under the action of gravity, particles with a diameter larger than the first screen hole 13 are screened out and stored in the first screen cylinder 1, while particles with a diameter smaller than the first screen hole 13 fall from the first screen hole 13 into the second screen cylinder 2. Simultaneously, under the action of gravity, particles with a diameter larger than the second screen hole 22 are screened out and stored in the second screen cylinder 1, while the remaining particles with a diameter smaller than the second screen hole 22 fall from the second screen hole 22 into the collection trough 7. This allows particles with a diameter larger than the first screen hole 13 to be screened and stored in the first screen cylinder 1, and particles with a diameter smaller than the first screen hole 13 and larger than the second screen hole 22 to be screened and stored in the second screen cylinder 2. Thus, the concrete is simultaneously screened twice to obtain two different particle sizes.

[0051] As an example, in this instance, the first sieve hole 13 of the first sieve cylinder 1 is configured with a diameter of 20mm, and the second sieve hole 22 of the second sieve cylinder 2 is configured with a diameter of 5mm. Thus, after the first sieve cylinder 1 and the second sieve cylinder 2 rotate synchronously to screen the concrete twice, the first sieve cylinder 1 stores particles with a diameter greater than 20mm, and the second sieve cylinder 2 stores particles with a diameter of 5-20mm, thereby obtaining two different particle sizes.

[0052] Here, the aperture diameters of the first sieve aperture 13 and the second sieve aperture 22 are not limited and can be adjusted according to specific applications. It is necessary to ensure that the aperture diameter of the first sieve aperture 13 is larger than that of the second sieve aperture 22.

[0053] Combination Figure 5To improve the screening effect of concrete, the rotating shaft 3 is configured as a hollow shaft, with its two ends passing through the first screen cylinder 1 and the second screen cylinder 2 respectively. The first end 31 of the rotating shaft 3 is connected to the drive motor 4, which drives the rotating shaft 3 to rotate. The second end 32 of the rotating shaft 3 is connected to the water inlet pipe 5 and / or the air inlet pipe 6. Several spray nozzles 33 are distributed on the rotating shaft 3, so that when the first screen cylinder 1 and the second screen cylinder 2 rotate synchronously, the water inlet pipe 5 delivers water to the rotating shaft 3, so that the water is sprayed out from the spray nozzles 33 of the rotating shaft 3 and enters the first screen cylinder 1 and the second screen cylinder 2. As the first screen cylinder 1 and the second screen cylinder 2 rotate, the water is evenly sprayed into the concrete, making it easier for the particles in the concrete to be deslimed and quickly screened out, thereby improving the screening effect and screening efficiency.

[0054] At the same time, the rotating shaft 3 sprays water into the first screen cylinder 1 and the second screen cylinder 2 through the spray nozzle 33, which can also wash the screened particles and facilitate particle collection.

[0055] Furthermore, after screening and washing, the air inlet pipe 6 delivers hot air to the rotating shaft 3, so that the hot air is ejected from the spray nozzle 33 of the rotating shaft 3 and enters the first screen cylinder 1 and the second screen cylinder 2. As the first screen cylinder 1 and the second screen cylinder 2 rotate, the hot air acts evenly on the particles, which can quickly dry the washed particles and facilitate the weighing of the particles.

[0056] Here, the spray nozzle 33 is preferably configured as a trapezoidal cross-section with a gradually increasing diameter, so that the water and hot air sprayed from the spray nozzle 33 can extend to the surrounding area, increasing the spray speed and coverage area of ​​the water and hot air, thereby improving the washing efficiency and drying efficiency.

[0057] Preferably, the second end 32 of the rotating shaft 3 is connected to the water inlet pipe 5 and the air inlet pipe 6 respectively through a three-way pipe, so that the water inlet pipe 5 and the air inlet pipe 6 can deliver water and hot air to the rotating shaft 3 respectively according to the screening process, so that the water inlet pipe 5, the air inlet pipe 6 and the rotating shaft 3 can cooperate with each other to improve the screening effect of concrete.

[0058] Furthermore, a sealing gasket can be provided on the first end 31 of the rotating shaft 3 that mates with the drive motor 4 to protect the drive motor 4 and prevent water and hot air from affecting the operation of the drive motor 4.

[0059] Combination Figure 1 and Figure 2 In conjunction with this, the bottom of the second screen cylinder 2 is provided with a collection trough 7 and a discharge port 8, so that the water sprayed by the rotating shaft 3 and the concrete remaining after screening by the first screen cylinder 1 and the second screen cylinder 2 can enter the collection trough 7 through the second screen hole 22 and be discharged from the discharge port. At the same time, the particles stored in the first screen cylinder 1 and the second screen cylinder 2 can be poured into the collection trough 7 for collection.

[0060] Specifically, the lower part of the second sieve cylinder 2 is built into the collection trough 7. The top of the collection trough 7 is provided with a rotating groove 72 for cooperating with the rotating shaft 3, so that the rotating shaft 3 can pass through the rotating groove 72 and be placed at the top of the collection trough 5, thereby building the lower parts of the first sieve cylinder 1 and the second sieve cylinder 2 into the collection trough 7, which facilitates the collection of sieved particles.

[0061] Combination Figure 2 Furthermore, the rotating groove 72 is configured in an inverted U-shape, so that when the rotating shaft 3 rotates through the rotating groove 72, the rotating groove 72 can restrict the rotation of the rotating shaft 3 and prevent the rotating shaft 3 from deviating during rotation, thereby ensuring that the first screen cylinder 1 and the second screen cylinder 2 can rotate stably and improving the stability of this screening and washing device.

[0062] Combination Figure 1 At this time, the drive motor 4 connected to the rotating shaft 3 is located outside the collection tank 7 and is connected to the collection tank through the mounting base 41. The mounting base 41 is preferably configured in an L-shape so that the mounting base 41 can stabilize the drive motor 7 and thus support the rotating shaft 3.

[0063] In addition, the collecting trough 7 is configured as a U-shaped trough, and a discharge port 8 is formed in the middle of the bottom surface 71, so that the collecting trough 7 constitutes a funnel, and the particles and water falling from the first screen cylinder 1 and the second screen cylinder 2 can slide down the bottom surface 71 of the collecting trough 7 towards the middle under the action of gravity, and finally be discharged smoothly from the discharge port 8.

[0064] Furthermore, a water storage tank or a drain pipe is installed below the discharge port 8 to collect the water discharged from the discharge port 8 during the rotation and screening process of the first screen cylinder 1 and the second screen cylinder 2.

[0065] Correspondingly, after the screening and washing are completed, a weighing device is installed below the discharge port 8. The particles stored in the first screen cylinder 1 and the second screen cylinder 2 are discharged from the discharge port 8 and fall into the weighing device for weighing, so as to determine the weight of the screened particles and control the quality of the concrete.

[0066] As an example, after the screening and washing are completed, the particles are dried and the remaining concrete in the collection tank 7 is discharged. Then the operating door 25 of the second screen cylinder 2 is opened so that the particles stored in the second screen cylinder 2 can fall into the collection tank 7 from the operating port 24 and be discharged from the discharge port 8 into the weighing device for weighing.

[0067] Furthermore, the feed gate 15 of the first screen cylinder 1 is opened, so that the particles stored in the first screen cylinder 1 can fall from the feed port 14 into the second screen cylinder 2, then fall from the operation port 24 of the second screen cylinder 2 into the collection tank 7, and be discharged from the discharge port 8 into the weighing device for weighing.

[0068] The collection tank 7 thus formed can be used in conjunction with the first sieve cylinder 1 and the second sieve cylinder 2 to collect and weigh the sieved particles.

[0069] Combination Figure 1 and Figure 2 To prevent water sprayed from the rotating shaft 3 from falling onto the drive motor 7 during the rotation and screening process of the first screen cylinder 1 and the second screen cylinder 2, a rotatable protective cover 9 is provided on the collection tank 7. The protective cover 9 is hinged to the collection tank 7 and covers the second screen cylinder 2. When the first screen cylinder 1 and the second screen cylinder 2 are rotating and screening, the protective cover 9 is closed and covers the second screen cylinder 2 to protect the water in the first screen cylinder 1 and the second screen cylinder 2 from falling out of the collection tank 7 and affecting the drive motor 7, thus ensuring the stability and reliability of this screening and washing device.

[0070] Example 2

[0071] Combination Figure 6 Based on Example 1, in order to prevent the particles in the remaining concrete discharged from the discharge port 8 from being too large and clogging the sewer, in this example, during the screening and washing stage, a screen 73 is installed below the collection tank 7, and the aperture of the screen 73 is smaller than the aperture of the second screen 22, so that the particles screened out in the first screen cylinder 1 and the second screen cylinder 2 will not fall from the screen 73.

[0072] Furthermore, a water receiving tray 74 is installed below the screen 73. A water receiving hole 75 for connecting to a drain pipe is formed in the middle of the water receiving tray 74, so that water and the remaining concrete from screening can fall from the collection tank 7 to the screen 73, intercepting larger particles in the remaining concrete in the screen 73, while the remaining water and smaller particles fall into the water receiving tray 73 and are introduced into the sewer through the drain pipe to prevent the sewer from being blocked.

[0073] As an example, in this instance, the mesh size of the screen 73 is configured to be 2mm, so that particles larger than 2mm are intercepted in the screen 73, while particles smaller than 2mm fall into the water receiving tray 74 and are guided into the sewer through the drain pipe without causing blockage.

[0074] Example 3

[0075] Based on Embodiment 1 and Embodiment 2, the number of screen cylinders in the screen cylinder assembly can be adjusted according to specific applications. For example, a third screen cylinder, a fourth screen cylinder, etc. can be attached to the outside of the second screen cylinder 2, and the screen hole diameter gradually decreases from the innermost screen cylinder to the outermost screen cylinder, so as to realize multiple screening of synchronous concrete and obtain particles of various sizes.

[0076] The following example illustrates the working process of this utility model in a specific application. It should be noted that the content described here is only a specific application example of this solution and does not constitute a limitation on this solution.

[0077] Combination Figures 1 to 3Rotate the protective cover 9 to expose the second screen cylinder 2, open the operating door 25 of the second screen cylinder 2, and then open the feed door 15 of the first screen cylinder 1 from the operating port 24. Put the concrete into the second screen cylinder 2 from the feed port 14, and finally close the protective cover 9 to complete the concrete feeding.

[0078] The drive motor 7 drives the rotating shaft 3 to rotate, thereby driving the first screen cylinder 1 and the second screen cylinder 2 to rotate synchronously. At the same time, the water inlet pipe 5 delivers water to the rotating shaft 3, so that the water is sprayed out from the spray nozzle 33 of the rotating shaft 3 and enters the first screen cylinder 1 and the second screen cylinder 2. As the first screen cylinder 1 and the second screen cylinder 2 rotate, the water is evenly sprayed into the concrete, making it easier for the particles in the concrete to remove mud and simultaneously washing the screened particles.

[0079] During this process, particles larger than the first sieve hole 13 are screened out and stored in the first sieve cylinder 1, while particles smaller than the first sieve hole 13 fall from the first sieve hole 13 into the second sieve cylinder 2. Simultaneously, under the action of gravity, particles larger than the second sieve hole 22 are screened out and stored in the second sieve cylinder 1. Meanwhile, the remaining concrete and the water sprayed from the rotating shaft 3 fall from the second sieve hole 22 into the collection tank 7 and are discharged from the discharge port 8, thus simultaneously achieving two screenings of the concrete to obtain two different particle sizes.

[0080] Next, the air inlet pipe 6 delivers hot air to the rotating shaft 3, so that the hot air is ejected from the spray nozzle 33 of the rotating shaft 3 and enters the first screen cylinder 1 and the second screen cylinder 2. As the first screen cylinder 1 and the second screen cylinder 2 rotate, the hot air acts evenly on the particles, which can quickly dry the washed particles, so as to complete the screening, washing and drying of concrete.

[0081] Next, rotate the protective cover 9 to expose the second screen cylinder 2, open the operating door 25 of the second screen cylinder 2, and let the particles stored in the second screen cylinder 2 fall from the operating port 24 into the collection tank 7, and then discharge them from the discharge port 8 into the weighing device for weighing.

[0082] Then, the feed gate 15 of the first screen cylinder 1 is opened, and the particles stored in the first screen cylinder 1 can fall from the feed port 14 into the second screen cylinder 2, and then fall from the operation port 24 of the second screen cylinder 2 into the collection tank 7, and then be discharged from the discharge port 8 into the weighing device for weighing.

[0083] This completes the collection and weighing of concrete sieved particles.

[0084] The new concrete screening and washing device provided by this utility model achieves simultaneous two-stage screening of concrete by having a first screen cylinder 1 built into a second screen cylinder 2 and cooperating with a rotating shaft 3 and a collection tank 7. During the screening process, the particles are rinsed and dried to improve the screening effect and ensure the reliability of the screening.

[0085] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A screen washing device for freshly mixed concrete, comprising a screen cylinder assembly, characterized in that, The screen cylinder assembly includes at least two interlocking, horizontally arranged screen cylinders. A first screen cylinder is built inside a second screen cylinder. The first screen cylinder is configured to accommodate concrete within it. The screen openings of the first screen cylinder are larger than those of the second screen cylinder, and the first and second screen cylinders are coaxially connected via a rotating shaft. The rotating shaft passes through the first screen cylinder and the second screen cylinder at both ends, respectively. The first end is connected to a drive motor, and the second end is connected to a water inlet pipe and / or an air inlet pipe. Spray nozzles are distributed on the rotating shaft. The bottom of the second screen cylinder is provided with a collection trough and a discharge port.

2. The fresh concrete screening and washing device according to claim 1, characterized in that, The first screen cylinder has a first screen hole formed on its first circumferential surface and a first end surface, and a feed inlet is formed on the first circumferential surface. The feed inlet is provided with a lockable and unlockable feed gate.

3. The fresh concrete screening and washing device according to claim 2, characterized in that, The second screen cylinder has a second screen hole formed on its second circumferential surface. The second end face of the second screen cylinder is formed by a mounting plate, and an operating port is formed on the second circumferential surface. The operating port is provided with an operating door that can be locked and unlocked.

4. The fresh concrete screening and washing device according to claim 3, characterized in that, The feed door and the operating door are respectively connected to the feed port and the operating port by snap-fit.

5. The fresh concrete screening and washing device according to claim 3, characterized in that, The lower part of the second sieve cylinder is built into the collection trough, and the top of the collection trough is provided with a rotating groove for cooperating with the rotating shaft.

6. The fresh concrete screening and washing device according to claim 5, characterized in that, The collection trough is configured as a U-shaped trough, and the discharge port is formed in the middle of the bottom surface.

7. The fresh concrete screening and washing device according to claim 6, characterized in that, A water storage tank or a drain pipe is installed below the discharge port.

8. The fresh concrete screening and washing device according to claim 6, characterized in that, A weighing device is installed below the discharge port.

9. The fresh concrete screening and washing device according to claim 5, characterized in that, The drive motor is located outside the collection tank and is connected to the collection tank via a mounting bracket.

10. The fresh concrete screening and washing device according to claim 9, characterized in that, The collection trough is equipped with a rotatable protective cover, which covers the second sieve cylinder.

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