Gravel screening device

Abstract

The utility model discloses a gravel screening device which comprises a machine frame, and the upper end of the machine frame is connected with a conveying mechanism. The screen drum is arranged at the tail part of the upper end of the transmission mechanism and is rotationally connected with the rack; a plurality of groups of screen holes with unequal hole diameters are formed in the peripheral wall of the screen drum in the axial direction; the feeding hopper is arranged at the upper part of the conveying mechanism and is connected with the rack; the end part of the screen drum is communicated with the bottom of the feeding hopper; the power assembly is used for driving the screen drum to rotate; the material baffles are symmetrically arranged on the two sides of the screen drum and extend in the feeding direction of the conveying mechanism. The gravel screening device has the advantages of being simple in structure, high in reliability and the like, and solves the problem that screening work efficiency is low due to the fact that screening foreign matter is accumulated on the screen drum or the screen and needs to be removed in a machine halt mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction equipment, and particularly relates to a sand and gravel screening device. Background Art

[0002] Sand and gravel refers to a loose mixture of sand grains and crushed stones. Geologically, mineral or rock particles with a particle size of 0.074 - 2 mm are called sand, and those with a particle size greater than 2 mm are called gravel or angular gravel. If the crushed stones in the sand and gravel are mostly gravel, it is called gravelly sand. In daily life, some people also call sandstone sand and gravel.

[0003] Chinese Patent with the application number CN202020153388.X discloses a sand and gravel screening device for construction, including a housing, a motor and support legs. Fixed blocks are installed on both sides inside the housing. A rotating rod is installed on the side of the fixed block away from the housing. A threaded rod is installed inside the housing. A fixed rod is installed inside the housing. A sleeve is sleeved outside the threaded rod. A connecting rod is installed at the bottom outside the sleeve. A scraping bar is installed at the bottom of the connecting rod. A limiting rod is installed outside the connecting rod. A sliding groove is opened inside the fixed rod. A filter screen is installed inside the housing. Discharge ports are opened on both sides of the housing. An outlet groove is opened at the bottom of the housing. One end of the rotating rod is fixedly installed with a first rotating shaft.

[0004] With further research by the applicant, it is found that although this technical solution uses a vibrating screen for screening, realizing the screening operation of sand and gravel with different particle sizes, if there are foreign objects with a large volume, such as stones, in the sand and gravel, during the screening process, continuous operation cannot be achieved. After screening a certain amount, it is necessary to manually remove the foreign objects, which is inconvenient to use and has low efficiency. Summary of the Utility Model

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A sand and gravel screening device, comprising:

[0007] A frame, with a transmission mechanism connected to the upper end;

[0008] A screen cylinder, placed at the upper end tail of the transmission mechanism and rotatably connected to the frame. A plurality of groups of screen holes with unequal aperture sizes are axially opened on the circumferential wall of the screen cylinder;

[0009] A feed hopper, arranged on the upper part of the transmission mechanism and connected to the frame. The end of the screen cylinder is communicated with the bottom of the feed hopper;

[0010] A power assembly, used to drive the screen cylinder to rotate;

[0011] Baffle plates, symmetrically arranged on both sides of the screen cylinder and extending along the feeding direction of the transmission mechanism;

[0012] The material receiving plate is arranged at the lower end of the tail of the screening cylinder and is connected to the baffle plate.

[0013] Furthermore, a notch for inserting the material receiving plate is formed on the baffle plate.

[0014] Furthermore, spiral guide pieces are arranged on the inner wall of the screening cylinder along the axial direction.

[0015] Furthermore, both the transmission mechanism and the screening cylinder are inclined.

[0016] Furthermore, a cover body arranged at the upper part of the screening cylinder is also connected to the frame.

[0017] Furthermore, an air duct is arranged at the top of the cover body, and a blower is connected to the upper end of the air duct.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] This sand and gravel screening device has the advantages of simple structure and strong reliability, and solves the problem that screening foreign matters accumulate on the screening cylinder or the screen mesh and need to be removed by stopping the machine, resulting in low screening work efficiency.

[0020] The sand and gravel to be screened enter the screening cylinder through the hopper. Under the action of the driving motor, the sand and gravel slide axially along the inner wall of the screening cylinder. The finer sand and gravel fall through the screen holes to the lower transmission mechanism and are conveyed to the front for centralized collection. Among them, since the aperture of the screen holes in the screening cylinder is distributed in a gradually increasing form, during the screening process, larger foreign matters fall onto the material receiving plate through the rear screen hole group, and then the foreign matters are led to the outside of the tail of the transmission mechanism through the material receiving plate. This process does not require stopping the machine to clean the foreign matters separately, thereby realizing continuous screening of the sand and gravel and improving the screening efficiency of the device. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a sand and gravel screening device of the utility model;

[0022] Figure 2 It is a cross-sectional structural schematic diagram of an embodiment of a sand and gravel screening device of the utility model;

[0023] Figure 3 It is a front view structural schematic diagram of the screening cylinder in the embodiment of the utility model;

[0024] Figure 4 It is a structural schematic diagram when the baffle plate and the material receiving plate are connected in the embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram after the baffle plate and the material receiving plate are separated in the embodiment of the utility model;

[0026] The reference numerals in the drawings of the specification include:

[0027] Frame 1, transmission mechanism 2, sieve cylinder 3, sieve holes 30, spiral guide pieces 31, feed hopper 4, power assembly 5, baffle 6, notch 60, material receiving plate 7, cover 8, air duct 80, fan 9. Specific embodiments

[0028] In order to enable those skilled in the art to better understand the present utility model, the technical solutions of the present utility model will be further described below in conjunction with the drawings and embodiments.

[0029] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar reference numerals in the drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] As Figure 1 - Figure 5 As shown, a sand screening device of the present utility model includes a frame 1, a sieve cylinder 3, a feeding device, and a power assembly 5;

[0031] Among them, a transmission mechanism 2 is connected to the upper end of the frame 1;

[0032] The sieve cylinder 3 is placed at the upper end tail of the transmission mechanism 2 and is rotationally connected to the frame 1. A plurality of groups of sieve holes 30 with unequal pore sizes are axially formed on the peripheral wall of the sieve cylinder 3;

[0033] The feed hopper 4 is arranged at the upper part of the transmission mechanism 2 and is connected to the frame 1. The end of the sieve cylinder 3 is communicated with the bottom of the feed hopper 4;

[0034] The power assembly 5 is used to drive the sieve cylinder 3 to rotate;

[0035] The power assembly 5 is not just a motor, but also includes a corresponding reduction gearbox transmission structure, and the rotational speed should not be too fast or too slow.

[0036] Wherein, baffle plates 6 are symmetrically arranged on both sides of the screening cylinder 3 and extend along the feeding direction of the conveying mechanism 2;

[0037] Both the conveying mechanism 2 and the screening cylinder 3 are inclined.

[0038] A material receiving plate 7 is arranged at the lower end of the tail of the screening cylinder 3, and the material receiving plate 7 is connected to the baffle plate 6. The connection form between the two can adopt a detachable connection form such as magnetic connection, bolts or Velcro.

[0039] This sand and gravel screening device has the advantages of simple structure and strong reliability, and solves the problem that screening foreign matters accumulate on the screening cylinder 3 or the screen mesh and need to be removed by stopping the machine, resulting in low screening work efficiency.

[0040] The sand and gravel to be screened enters the screening cylinder 3 through the hopper. Under the action of the driving motor, the sand and gravel axially slides along the inner wall of the screening cylinder 3. The finer sand and gravel fall from the screening holes 30 to the conveying mechanism 2 below and are conveyed to the front for centralized collection. Among them, since the aperture of the screening holes 30 in the screening cylinder 3 is distributed in a gradually increasing form, during the screening process, foreign matters with a larger volume fall onto the material receiving plate 7 through the set of screening holes 30 at the rear. The foreign matters are then led to the outside of the tail of the conveying mechanism 2 through the material receiving plate 7. This process does not require stopping the machine to clean the foreign matters separately, thus realizing continuous screening of the sand and gravel and improving the screening efficiency of the device.

[0041] Specifically, as Figure 4 、 Figure 5 shown, a notch 60 for inserting the material receiving plate 7 is formed on the baffle plate 6. An elastic rubber pad is arranged on the inner wall of the notch 60. After the material receiving plate 7 is inserted, the material receiving plate 7 is clamped at the notch 60 of the baffle plate 6 through the action of the elastic rubber pad. In addition, a number of equally spaced through holes (not shown in the figure) can also be formed at the upper end of the material receiving plate 7 and in the length direction of the baffle plate 6. Using a connecting strip adapted to both of them, the connecting strip is fixed to the upper end of the material receiving plate 7 with bolts. Both sides of the connecting strip are matched with the through holes at the corresponding distances through bolts to make the connection, achieving the effect of adjusting the position and fixing the material receiving plate 7.

[0042] By changing the stroke of the material receiving plate 7 extending into the notch 60, the position of the material receiving plate 7 at the bottom of the screening cylinder 3 is changed. If foreign matters such as stones in the sand and gravel are small, the material receiving plate 7 can be moved upward along the inclined direction of the screening cylinder 3, so that the material receiving plate 7 extends deeper into the notch 60, the material receiving plate 7 is closer to the feeding side of the screening cylinder 3, and closer to the screening holes 30 with a smaller aperture. In this way, the fallen smaller stones will not fall onto the conveying mechanism 2 but will be mixed with the screened fine sand and gravel. The relative movable setting form of the material receiving plate 7 and the baffle plate 6 can be adjusted according to the actual situation of the sand and gravel, making the screening work more convenient.

[0043] In addition, to enhance the mobility of the sand and gravel inside the sieve cylinder 3, spiral guide vanes 31 are arranged on the inner wall of the sieve cylinder 3 and distributed axially. Through the action of the spiral guide vanes 31, the sand and gravel can be guided to prevent accumulation.

[0044] In addition, a cover body 8 is also connected to the frame 1 and arranged above the sieve cylinder 3. An air duct 80 is arranged at the top of the cover body 8, and the upper end of the air duct 80 is connected to a fan 9.

[0045] In addition, universal wheels can be installed at the bottom of the frame 1 to facilitate the movement of the entire device and reduce the handling cost.

[0046] The above are only embodiments of the present utility model. Specific structures and common knowledge such as characteristics that are well-known in the solution are not described in detail here. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model belongs before the application date or the priority date, can know all the existing technologies in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application and combined with their own abilities, improve and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent.

Claims

1. A sand and gravel screening device, characterized in that: include: A frame, the upper end of which is connected with a transmission mechanism; A screen drum is placed at the tail end of the upper end of the transmission mechanism and is rotatably connected to the frame. The peripheral wall of the screen drum is provided with a plurality of groups of screen holes with different apertures in the axial direction. A feed hopper is arranged on the upper part of the transmission mechanism and connected to the frame, and the end of the screen drum is connected to the bottom of the feed hopper; A power assembly, used for driving the screen drum to rotate; The baffle plates are symmetrically arranged on both sides of the screen drum and extend along the feeding direction of the transmission mechanism; The material receiving plate is arranged at the lower end of the tail of the screen cylinder and is connected with the material blocking plate.

2. A sand and gravel screening device according to claim 1, characterized in that: The material blocking plate is provided with a notch for the material receiving plate to be inserted.

3. A sand and gravel screening device as claimed in claim 1 or 2, characterized in that: The inner wall of the screen drum is provided with spiral guide vanes distributed along the axial direction.

4. A sand and gravel screening device as claimed in claim 3, characterized in that: The transmission mechanism and the screen drum are both arranged inclined.

5. A sand and gravel screening device as claimed in claim 1, 2 or 4, characterized in that: The frame is also connected with a cover body arranged on the upper part of the screen drum.

6. A sand and gravel screening device as claimed in claim 5, characterized in that: An air duct is arranged on the top of the cover body, and a fan is connected to the upper end of the air duct.

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