Gravel mixture screening device and gravel screening method

Abstract

The invention relates to the technical field of constructional engineering, in particular to a sand-gravel mixture screening device and a sand-gravel screening method.The sand-gravel mixture screening device comprises a conveying device, a first drying device, a screening device body and a spraying device; the material conveying device is provided with a material conveying cavity for conveying a gravel mixture; the first drying device is used for drying the gravel mixture in the material conveying cavity; the screening device is provided with a vertically inclined or vertically arranged screening cavity, a gate plate is arranged in the screening cavity and divides the screening cavity into an upper cavity body and a lower cavity body which are vertically arranged at an interval, the upper end of the upper cavity body communicates with the discharging end of the material conveying cavity, a stone screening module is arranged in the upper cavity body, and a sand screening module is arranged in the lower cavity body; the spraying device is arranged on the upper cavity and used for flushing the screened stones; the flashboard is closed, the spraying device sprays the stone left on the stone screening module, and after drying and screening, the sand body left on the outer side of the stone is less, so that the water consumption for spraying is less.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a sand-gravel mixture screening device and a sand-gravel screening method. Background Art

[0002] Screening of sand and gravel is a crucial link in the production, processing and use of sand and gravel. This process not only affects the quality and performance of sand and gravel products, but also directly affects the subsequent production quality and use effect of concrete or other building materials. Due to environmental conditions, it is sometimes necessary to screen the wet sand and gravel mixture. At present, when screening the wet sand and gravel mixture, the wet sand and gravel mixture is often washed first. Since there is more sand adhering to the surface of the stone, a large amount of water is consumed when washing the sand and gravel mixture, resulting in a waste of water resources. Summary of the invention

[0003] The technical problem to be solved by the present invention is: at present, when the wet sand and gravel mixture is screened, the water consumption is relatively large, resulting in a waste of water resources.

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a sand-stone mixture screening device, comprising a feeding device, a first drying device, a screening device and a spraying device;

[0005] The feeding device has a feeding cavity for feeding the sand-stone mixture;

[0006] The first drying device is used to dry the sand and gravel mixture in the feeding cavity;

[0007] The screening device has a screening chamber which is arranged up and down inclined or vertically, a gate plate is provided in the screening chamber, the gate plate divides the screening chamber into an upper cavity and a lower cavity which are arranged up and down at intervals, the upper end of the upper cavity is connected with the discharge end of the feeding cavity, a stone screening module is provided in the upper cavity, and a sand screening module is provided in the lower cavity;

[0008] The spray device is arranged in the upper cavity, and the spray device is used to wash the screened stones;

[0009] When the gate is opened, the sand separated by the stone screening module falls into the lower cavity; when the gate is closed, the spray device sprays the stones remaining on the stone screening module.

[0010] As a preferred solution, the gate plate is arranged to be inclined upward and downward, and the screening device has a water outlet, which is communicated with the bottom of the upper cavity and is arranged close to the lower end of the gate plate.

[0011] As a preferred embodiment, the sand and gravel mixture screening device also includes a second drying device, and the second drying device is used to dry the washed stones in the upper cavity.

[0012] As a preferred solution, the feeding device comprises a feeding belt and a sealing shell covering the feeding belt, and the sealing shell and the feeding belt enclose the feeding cavity.

[0013] As a preferred solution, the sand and gravel mixture screening device also includes a first vibration exciting device, and the first vibration exciting device is used to drive the conveyor belt to vibrate.

[0014] As a preferred solution, the first drying device comprises a hot air blower, and an air outlet end of the hot air blower is connected to the material delivery cavity.

[0015] As a preferred solution, the sand and gravel mixture screening device further comprises an exhaust pipe, one end of which is connected to the feeding cavity, and the other end of which is connected to the outside.

[0016] As a preferred solution, the sand and gravel mixture screening device further includes a second vibration excitation device, and the screening device is arranged on the second vibration excitation device.

[0017] A sand and gravel screening method, using the above-mentioned sand and gravel mixture screening device, the sand and gravel screening method comprises the following steps:

[0018] Open the gate and close the sprinkler;

[0019] The feeding device and the first drying device are turned on, and the sand and gravel mixture is added into the feeding cavity;

[0020] After a certain amount of stones are accumulated on the stone screening module, the feeding device and the first drying device are closed;

[0021] Close the gate and open the spray device to spray the stones on the stone screening module.

[0022] As a preferred solution, the sand and gravel mixture screening device further comprises a second drying device. After the stones on the stone screening module are sprayed, the second drying device is turned on to dry the washed stones.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The sand-gravel mixture screening device of the present invention comprises a feeding device, a first drying device, a screening device and a spraying device; the feeding device has a feeding cavity for conveying the sand-gravel mixture; the first drying device is used to dry the sand-gravel mixture in the feeding cavity; the screening device has a screening cavity arranged vertically or tilted up and down, a gate plate is provided in the screening cavity, the gate plate divides the screening cavity into an upper cavity and a lower cavity arranged vertically, the upper end of the upper cavity is connected to the discharge end of the feeding cavity, and a stone screening module is provided in the upper cavity. A sand screening module is provided in the lower cavity; a spray device is provided in the upper cavity, and the spray device is used to wash the screened stones; the gate is opened, and the sand screened by the stone screening module falls into the lower cavity; the gate is closed, and the spray device sprays the stones remaining on the stone screening module. After drying and screening, less sand remains on the outside of the stone, so less water is used for spraying. Closing the gate can prevent the spray water from entering the lower cavity, ensuring the drying of the sand, which is conducive to screening the sand by the sand screening module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the sand-gravel mixture screening device of the present invention;

[0026] Figure 2 Schematic diagram of the internal structure of the screening device;

[0027] Figure 3 is a schematic diagram of the structure of the sealing shell;

[0028] Figure 4 It is a schematic diagram of the structure of the conveyor belt;

[0029] Figure 5 It is a schematic diagram of the installation structure of the stone screening mesh plate;

[0030] Figure 6 is a schematic structural diagram of a first excitation device;

[0031] In the figure, 1. feeding device, 11. feeding cavity, 12. feeding belt, 13. sealing shell, 131. feeding port, 14. sealing cover, 15. feeding pipe, 21. first drying device, 22. second drying device, 3. screening device, 31. screening cavity, 311. upper cavity, 312. lower cavity, 32. stone screening mesh plate, 33. sand screening mesh plate, 34. sealing door, 35. connecting frame, 4. spraying device, 5. gate plate, 61. exhaust pipe, 62. spray water recovery pipe, 71. first vibration device, 711. vibration table, 712. spring seat, 713. power transmission rod, 72. second vibration device. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0034] like Figures 1 to 6 As shown, a preferred embodiment of the sand-gravel mixture screening device of the present invention comprises a feeding device 1, a first drying device 21, a screening device 3 and a spraying device 4; the feeding device 1 has a feeding cavity 11 for conveying the sand-gravel mixture; the first drying device 21 is used to dry the sand-gravel mixture in the feeding cavity 11; the screening device 3 has a screening cavity 31 arranged vertically or tilted up and down, a gate plate 5 is provided in the screening cavity 31, and the gate plate 5 divides the screening cavity 31 into an upper cavity 311 and a lower cavity 312 arranged vertically and spaced apart from each other, the upper end of the upper cavity 311 is connected to the discharge end of the feeding cavity 11, and the upper cavity 312 is connected to the discharge end of the feeding cavity 11. A stone screening module is provided in 311, and a sand screening module is provided in the lower cavity 312; a spray device 4 is provided in the upper cavity 311, and the spray device 4 is used to wash the screened stones; the gate plate 5 is opened, and the sand screened by the stone screening module falls into the lower cavity 312; the gate plate 5 is closed, and the spray device 4 sprays the stones remaining on the stone screening module. After drying and screening, less sand remains on the outside of the stone, so less water is used for spraying. Closing the gate plate 5 can prevent the spray water from entering the lower cavity 312, ensuring the drying of the sand, which is beneficial to the sand screening module to screen the sand.

[0035] Among them, the feeding device 1 includes a feeding belt 12 and a sealing shell 13 covered on the feeding belt 12, and the sealing shell 13 and the feeding belt 12 enclose a feeding cavity 11. Specifically, in this embodiment, the sealing shell 13 is a semicircular cylinder, the sealing shell 13 is covered on the feeding belt 12, and the feeding cavity 11 is enclosed with the feeding belt 12, and the sealing shell 13 can play a role in heat preservation and preventing the diffusion of sand bodies. The sealing shell 13 has a first port close to the screening device 3 and a second port away from the screening device 3, the second port is connected to a sealing plate, the first port is connected to a circular arc feeding pipe 15, the upper end of the feeding pipe 15 is connected to the first port, and the lower end of the feeding pipe 15 is connected to the upper end of the upper cavity 311. A feeding port 131 is provided at a position close to the second port of the sealing shell 13, and a hopper is connected to the feeding port 131, so as to facilitate the addition of a wet sand and gravel mixture into the feeding cavity 11.

[0036] In this embodiment, the sand-gravel mixture screening device further includes a first excitation device 71, which is used to drive the conveyor belt to vibrate. The vibration of the conveyor belt can increase the heat exchange efficiency between the sand-gravel mixture on the conveyor belt and the hot air, and improve the drying effect of the sand-gravel mixture. In addition, the first excitation device 71 can also promote the pre-separation of sand and stones in the sand-gravel mixture on the conveyor belt. Among them, the conveyor belt includes a driving roller group and a belt body wound around the driving roller group, and the driving roller group is connected to the support frame.

[0037] Specifically, the first excitation device 71 includes an excitation platform 711, a spring seat 712 arranged at the bottom of the excitation platform 711, and a power transmission rod 713 arranged on the excitation platform 711. The end of the power transmission rod 713 away from the excitation platform 711 extends to the bottom of the conveyor belt 12, and the power transmission rod 713 pushes the conveyor belt 12 upward. The excitation platform 711 is a vibration source, and the vibration of the excitation platform 711 is transmitted to the conveyor belt 12 through the power transmission rod 713. Further, in this embodiment, the end of the power transmission rod 713 away from the excitation platform 711 is connected to a roller through a rolling bearing, and the roller presses the conveyor belt 12 upward. The first excitation device 71 and the first drying device 21 include a hot air blower, and the air outlet end of the hot air blower is connected to the conveyor cavity 11. To ensure the drying effect, in this embodiment, a plurality of hot air blowers are provided, and the air outlet end of each hot air blower is connected to the conveyor cavity 11, and the air outlet ends of each hot air blower are arranged in sequence along the length direction of the conveyor cavity 11.

[0038] Furthermore, the sand and gravel mixture screening device also includes an exhaust pipe 61, one end of the exhaust pipe 61 is connected to the feed chamber 11, and the other end is connected to the outside. The exhaust pipe 61 is used to discharge the water vapor formed by the heated sand and gravel mixture to the outside of the feed chamber 11 in time to prevent the water vapor from condensing into water on the inner wall of the feed pipe 15 and dripping onto the feed belt 12 again.

[0039] In this embodiment, the gate plate 5 is arranged tilted up and down, and the screening device 3 has a water outlet, which is connected to the bottom of the upper cavity 311 and arranged near the lower end of the gate plate 5. After the spray water falls on the gate plate 5, it flows into the water outlet along the gate plate 5, which is convenient for recycling the spray water. In this embodiment, the end of the water outlet away from the upper cavity 311 is connected to the spray water recovery pipe 62.

[0040] In this embodiment, the sand-gravel mixture screening device further includes a second drying device 22, which is used to dry the washed stones in the upper cavity 311. The second drying device 22 can dry the stones after spraying, and the stones processed by the sand-gravel mixture screening device are in a dry state, so as to prevent the stones from being contaminated by dirt due to moisture.

[0041] Furthermore, the sand-gravel mixture screening device further comprises a second vibration excitation device 72, and the screening device 3 is arranged on the second vibration excitation device 72. The second vibration excitation device 72 can drive the screening device 3 to vibrate as a whole, thereby improving the screening effect.

[0042] In this embodiment, the stone screening module includes a plurality of stone screening mesh plates 32, each of which is located in the upper cavity 311, and each of which is spaced from top to bottom, and the mesh of the stone screening mesh plate 32 located at the upper part is larger than the mesh of the stone screening mesh plate 32 located at the lower part. By controlling the mesh of each stone screening mesh plate 32, the screening of stones of different sizes is achieved. The sand screening module includes a plurality of sand screening mesh plates 33, each of which is located in the lower cavity 312, and each of which is spaced from top to bottom, and the mesh of the sand screening mesh plate 33 located at the upper part is larger than the mesh of the sand screening mesh plate 33 located at the lower part.

[0043] The screening device 3 includes a rectangular cylinder arranged up and down, the cylinder cavity of the rectangular cylinder forms a screening cavity 31, and the side wall of the rectangular cylinder is provided with a plurality of openable sealing doors 34, a sealing door 34 is provided at a stone screening mesh plate 32, and a sealing door 34 is provided at a sand screening mesh plate 33, and the stone screening mesh plate 32 and the sand screening mesh plate 33 can be replaced by opening the sealing door 34. In order to facilitate the disassembly of the stone screening mesh plate 32 and the sand screening mesh plate 33, the stone screening mesh plate 32 and the sand screening mesh plate 33 are both arranged in the screening device 3 in a plug-in manner. Specifically, a connection frame 35 is welded to the inner wall of the screening cavity 31, and the connection frame 35 is provided with a slot, and the stone screening mesh plate 32 and the sand screening mesh plate 33 are respectively inserted in the corresponding slots. There are many ways to arrange the gate plate 5, such as also arranging a connection frame 35 at the position where the gate plate 5 is located, inserting the gate plate 5 into a slot, or arranging the gate plate 5 as a valve body.

[0044] An embodiment of a sand and gravel screening method, using the above-mentioned sand and gravel mixture screening device, the sand and gravel screening method comprises the following steps:

[0045] Open the gate 5 and close the spray device 4;

[0046] The feeding device 1 and the first drying device 21 are turned on, and the sand and gravel mixture is added into the feeding cavity 11;

[0047] After a certain amount of stones are accumulated on the stone screening module, the feeding device and the first drying device 21 are closed;

[0048] The gate plate 5 is closed and the spraying device 4 is turned on to spray the stones on the stone screening module.

[0049] The sand-gravel mixture screening device further comprises a second drying device 22. After the stones on the stone screening module are sprayed, the second drying device 22 is turned on to dry the washed stones.

[0050] In summary, the sand-gravel mixture screening device of the present invention comprises a feeding device 1, a first drying device 21, a screening device 3 and a spraying device 4; the feeding device 1 has a feeding cavity 11 for conveying the sand-gravel mixture; the first drying device 21 is used to dry the sand-gravel mixture in the feeding cavity 11; the screening device 3 has a screening cavity 31 arranged vertically or tilted up and down, a gate plate 5 is provided in the screening cavity 31, and the gate plate 5 divides the screening cavity 31 into an upper cavity 311 and a lower cavity 312 arranged vertically and spaced apart from each other, the upper end of the upper cavity 311 is connected to the discharge end of the feeding cavity 11, and the upper cavity 311 is connected to the discharge end of the feeding cavity 11. A stone screening module is provided in the middle, and a sand screening module is provided in the lower cavity 312; a spray device 4 is provided in the upper cavity 311, and the spray device 4 is used to wash the screened stones; the gate plate 5 is opened, and the sand screened by the stone screening module falls into the lower cavity 312; the gate plate 5 is closed, and the spray device 4 sprays the stones remaining on the stone screening module. After drying and screening, less sand remains on the outside of the stone, so less water is used for spraying. Closing the gate plate 5 can prevent the spray water from entering the lower cavity 312, thereby ensuring the drying of the sand and facilitating the screening of the sand by the sand screening module.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sand and gravel mixture screening device, characterized in that: It comprises a feeding device (1), a first drying device (21), a screening device (3) and a spraying device (4); The feeding device (1) comprises a feeding cavity (11) for feeding a sand-stone mixture; The first drying device (21) is used for drying the sand and gravel mixture in the feeding cavity (11); The screening device (3) comprises a screening chamber (31) which is arranged inclined up and down or vertically, a gate plate (5) is arranged in the screening chamber (31), the gate plate (5) divides the screening chamber (31) into an upper chamber (311) and a lower chamber (312) which are arranged in an upper and lower interval, the upper end of the upper chamber (311) is connected to the discharge end of the feeding chamber (11), a stone screening module is arranged in the upper chamber (311), and a sand screening module is arranged in the lower chamber (312); The spray device (4) is arranged in the upper cavity (311), and the spray device (4) is used to wash the sieved stones; When the gate plate (5) is opened, the sand separated by the stone screening module falls into the lower cavity (312); when the gate plate (5) is closed, the spray device (4) sprays the stones remaining on the stone screening module.

2. The sand-gravel mixture screening device according to claim 1, characterized in that: The gate plate (5) is arranged to be inclined up and down, and the screening device (3) has a water outlet, which is connected to the bottom of the upper cavity (311) and is arranged close to the lower end of the gate plate (5).

3. The sand-gravel mixture screening device according to claim 1, characterized in that: The sand and gravel mixture screening device further comprises a second drying device (22), wherein the second drying device (22) is used for drying the washed stones in the upper cavity (311).

4. The sand-gravel mixture screening device according to claim 1, characterized in that: The feeding device (1) comprises a feeding belt (12) and a sealing shell (13) covering the feeding belt (12); the sealing shell (13) and the feeding belt (12) enclose the feeding cavity (11).

5. The sand-gravel mixture screening device according to claim 4, characterized in that: The sand and gravel mixture screening device further comprises a first vibration exciting device (71), wherein the first vibration exciting device (71) is used to drive the conveyor belt to vibrate.

6. The sand-gravel mixture screening device according to claim 4, characterized in that: The first drying device (21) comprises a hot air blower, and an air outlet end of the hot air blower is connected to the material delivery cavity (11).

7. The sand-gravel mixture screening device according to claim 4, characterized in that: The sand-gravel mixture screening device further comprises an exhaust pipe (61), one end of which is connected to the material delivery cavity (11), and the other end of which is connected to the outside.

8. The sand-gravel mixture screening device according to claim 1, characterized in that: The sand-gravel mixture screening device further comprises a second vibration excitation device (72), and the screening device (3) is arranged on the second vibration excitation device (72).

9. A sand and gravel screening method, characterized in that: Using the sand and gravel mixture screening device according to any one of claims 1 to 8, the sand and gravel screening method comprises the following steps: Open the gate (5) and close the spray device (4); The feeding device (1) and the first drying device (21) are turned on, and the sand and gravel mixture is added into the feeding cavity (11); After a certain amount of stones are accumulated on the stone screening module, the feeding device (1) and the first drying device (21) are closed; The gate plate (5) is closed and the spraying device (4) is turned on to spray the stones on the stone screening module.

10. The sand and gravel screening method according to claim 9, characterized in that: The sand and gravel mixture screening device also includes a second drying device (22). After the stones on the stone screening module are sprayed, the second drying device (22) is turned on to dry the washed stones.

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