Screening machine for concrete aggregates of different grades

Abstract

The utility model belongs to the technical field of screening devices, and particularly relates to a different-grading concrete aggregate screening machine which comprises a support and a screening cylinder, the screening cylinder is obliquely and rotatably arranged on the support, the hole diameters of screening holes formed in the screening cylinder are gradually increased from high to bottom, and a transmission mechanism is arranged between the support and the screening cylinder. An anti-blocking mechanism is arranged between the screening barrel and the bracket; by means of the rolling design of the screening barrel, aggregate can be effectively made to be more continuous and better in screening effect through the gravity effect, part of aggregate blocked in screening holes can be removed in the screening process or after the screening process through the arrangement of the anti-blocking mechanism, and the screening efficiency and effect are ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of screening devices, specifically relating to a concrete aggregate screening machine with different gradations. Background Technology

[0002] Aggregates are an indispensable material in concrete preparation, mainly serving as the skeleton and filler in concrete. Functionally, aggregates are divided into fine aggregates and coarse aggregates, and their particle size determines the overall molding properties of the concrete. Therefore, aggregates need to be screened during the collection stage or before use. Especially during the collection stage, the particle size of aggregates varies, requiring multi-stage screening using screens with different aperture sizes. Currently, conventional screening tools are more prone to encountering aggregates with a large particle size range where the aggregate size is close to the aperture size of the screen, causing the aggregate to clog the screen and affecting the overall screening effect and efficiency. Therefore, manual cleaning of the screen is required multiple times using tools, such as loosening the holes and tapping, to achieve the desired cleaning effect. However, this method is not only labor-intensive but also often requires machine downtime, thus affecting the efficiency of production operations. Utility Model Content

[0003] The purpose of this invention is to provide a concrete aggregate screening machine with different gradations to solve the problems mentioned in the background art.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] A concrete aggregate screening machine with different gradations includes a support and a screening cylinder. The screening cylinder is tilted and rotated on the support. The screen holes on the screening cylinder gradually increase in diameter from high to low. A transmission mechanism is provided between the support and the screening cylinder. An anti-blocking mechanism is provided between the screening cylinder and the support.

[0006] The anti-blocking mechanism includes a crossbar, a lever, a striking plate, and an elastic element. The crossbar is rotatably mounted on the upper end of the support via a connecting lug and its length matches the screening area of ​​the screening cylinder. There are several striking plates and levers. Several striking plates are equidistantly arranged on the crossbar, and several levers are evenly arranged circumferentially on the screening cylinder and correspond to the position of one of the striking plates. The elastic element is located between the crossbar and the connecting lug. The striking plate on the crossbar is kept in contact with the outer wall of the screening cylinder under the action of the elastic element.

[0007] The transmission mechanism includes a motor, a transmission wheel, a driven wheel, and a belt. The motor is connected to the side of the support, the transmission wheel is connected to the output shaft of the motor, the driven wheel is circular and concentrically located on the outside of the screening cylinder, and the belt is located between the transmission wheel and the driven wheel.

[0008] The elastic element includes a torsion spring and a limiting plate. The limiting plate is connected to the crossbar, and the torsion spring is sleeved on the crossbar with its two ends connected to the limiting plate and the connecting ear on the same side, respectively.

[0009] The striking plate is inclined on the crossbar and its length is greater than the minimum distance between the crossbar and the screening cylinder.

[0010] The length of the actuating plate is less than the minimum distance between the crossbar and the screening cylinder.

[0011] A bracket is also provided on the connecting ear on the side with a lower horizontal height. The bracket has a first hole that is concentric with the axis of the crossbar. The crossbar has a second hole that corresponds to the circumferential position of the first hole. The diameter of the first hole and the second hole are the same.

[0012] This application has at least the following advantages compared to the prior art:

[0013] The rolling design of the screening cylinder utilizes gravity to effectively ensure a more continuous screening process and achieve better screening results. The anti-clogging mechanism removes some of the aggregate that is blocked in the screen holes during or after screening, ensuring the efficiency and effectiveness of screening. Attached Figure Description

[0014] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model from another angle.

[0017] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0018] Figure 4 This is a cross-sectional view of the structure of this utility model.

[0019] 1. Support frame, 2. Screening cylinder, 3. Crossbar, 31. Actuating plate, 32. Striking plate, 33. Connecting ear, 4. Motor, 41. Drive wheel, 42. Driven wheel, 43. Belt, 5. Torsion spring, 51. Limiting plate, 6. Support frame, 61. First hole, 62. Detailed Implementation

[0020] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1-4As shown, a concrete aggregate screening machine with different gradations includes a support 61 and a screening cylinder 2. The screening cylinder 2 is tilted and rotated on the support 61. The screen holes on the screening cylinder 2 gradually increase in diameter from high to low. A transmission mechanism is provided between the support 61 and the screening cylinder 2. An anti-blocking mechanism is provided between the screening cylinder 2 and the support 61.

[0022] The anti-blocking mechanism includes a crossbar 3, a lever 31, a striking plate 32, and an elastic element. The crossbar 3 is rotatably mounted on the upper end of the support 61 via a connecting ear 33, and its length matches the screening area of ​​the screening cylinder 2. There are several striking plates 32 and several levers 31. Several striking plates 32 are equidistantly arranged on the crossbar 3, and several levers 31 are evenly arranged in a circle on the screening cylinder 2 and correspond to the position of one of the striking plates 32. The elastic element is located between the crossbar 3 and the connecting ear 33. The striking plate 32 on the crossbar 3 remains in contact with the outer wall of the screening cylinder 2 under the action of the elastic element.

[0023] During aggregate screening, the aggregate is fed into the higher side of the screening cylinder 2. Through gravity and the rotational drive of the screening cylinder 2 by the transmission mechanism, the aggregate gradually slides down from the higher side to the lower side. The aggregates of different particle sizes are screened by the screening action of the screening cylinder 2 with the aperture gradually increasing from the higher side to the lower side, thereby distinguishing the aggregates of different particle sizes. The inner wall of the screening cylinder 2 is equipped with several baffles to prevent the aggregates from sliding down too quickly and causing insufficient screening.

[0024] Since some particles are similar in size to the sieve openings, the sieve openings are easily clogged by the aggregate, which affects the overall screening efficiency and effect. Therefore, during the screening process, the agitator 31 on the outside of the screening cylinder 2 rotates synchronously. During the movement, it pushes and lifts the striking plate 32 on the crossbar 3. Due to the action of the elastic element, the striking plate 32 remains in sliding contact with the screening cylinder 2 when it is not in contact with the lifting. After the lifting, until the agitator 31 passes the striking plate 32, due to the torsional reset action of the elastic element and the height difference, the striking plate 32 will strike the screening cylinder 2, so that the aggregate clogged in the sieve openings of the screening cylinder 2 falls off through vibration and knocking, which plays a role in cleaning the sieve openings and ensuring screening efficiency.

[0025] The transmission mechanism includes a motor 4, a transmission wheel 41, a driven wheel 42, and a belt 43. The motor 4 is connected to the side of the bracket 61. The transmission wheel 41 is connected to the output shaft of the motor 4. The driven wheel 42 is annular and concentrically located on the outside of the screening cylinder 2. The belt 43 is located between the transmission wheel 41 and the driven wheel 42.

[0026] When the motor 4 starts, it transmits rotational power to the driven wheel 42 through the transmission wheel and belt 43. The driven wheel 42 then drives the screening cylinder 2 to rotate, thus driving the rotation of the screening cylinder 2.

[0027] The elastic element includes a torsion spring 5 and a limiting piece 51. The limiting piece 51 is connected to the crossbar 3. The torsion spring 5 is sleeved on the crossbar 3 and its two ends are respectively connected to the limiting piece 51 and the connecting ear 33 on the same side.

[0028] The two ends of the torsion spring 5 are connected to the limiting plate 51 and the connecting ear 33 respectively. The connecting ear 33 is stationary relative to the limiting plate 51. Therefore, when the crossbar 3 rotates and drives the limiting plate 51 to rotate, the generated torsional force will be stored in the torsion spring 5. Subsequently, the crossbar 3 and the striking plate 32 will be reset and strike through the torsion reset of the torsion spring 5.

[0029] The striking plate 32 is inclined on the crossbar 3 and its length is greater than the minimum distance between the crossbar 3 and the screening cylinder 2.

[0030] The length of the actuating plate 31 is less than the minimum distance between the crossbar 3 and the screening cylinder 2.

[0031] This ensures that the striking plate 32 will not overturn due to the torsion of the torsion spring 5, and that the toggle piece 31 can effectively interact with the striking plate 32.

[0032] A bracket 61 is also provided on the connecting ear 33 on the side with lower horizontal height. The bracket 61 has a first hole 61 that is concentric with the axis of the crossbar 3. The crossbar 3 has a second hole 62 that corresponds to the circumferential position of the first hole 61. The diameter of the first hole 61 and the second hole 62 are the same.

[0033] When cleaning or other conditions do not require the anti-blocking mechanism to operate, the crossbar 3 can be manually rotated so that the second hole 62 on the crossbar 3 corresponds to the first hole 61 on the bracket 61. Finally, the crossbar 3 is limited by a pin or other cylindrical rod, so that the striking plate 32 tilts upward and does not interact with the actuating plate 31 and the screening cylinder 2, thus meeting the anti-blocking mechanism requirements in specific situations.

[0034] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A concrete aggregate grading machine of different gradations, comprising a support and a grading cylinder, the grading cylinder being arranged in the support and being able to rotate obliquely, the screen holes formed in the grading cylinder gradually increase in size from top to bottom, and a transmission mechanism is arranged between the support and the grading cylinder. The anti-blocking mechanism is arranged between the screening cylinder and the support; The anti-blocking mechanism comprises a cross rod, a poking piece, a knocking plate and an elastic member. The cross rod is arranged on the upper end of the support in a rotating manner through a connecting lug and has a length matching the screening area of the screening cylinder. The knocking plate and the poking piece are both provided in a plurality of pieces. The knocking plates are arranged at equal intervals on the cross rod. The poking pieces are arranged on the screening cylinder in a circumferential and uniform manner and are matched with one of the knocking plates in position. The elastic member is arranged between the cross rod and the connecting lug. The knocking plates on the cross rod are kept in abutment with the outer wall of the screening cylinder under the action of the elastic member.

2. A machine for sizing aggregates of different gradings according to claim 1, characterized in that: The transmission mechanism comprises a motor, a driving wheel, a driven wheel and a belt. The motor is connected to the side of the support. The driving wheel is in transmission connection with the output shaft of the motor. The driven wheel is annular and concentrically arranged outside the screening cylinder. The belt is arranged between the driving wheel and the driven wheel.

3. A machine for sizing aggregates of different gradings according to claim 2, characterized in that: The elastic member comprises a torsion spring and a limiting piece. The limiting piece is connected to the cross rod. The torsion spring is sleeved on the cross rod and has two ends connected to the limiting piece and the connecting lug on the same side respectively.

4. A machine for sizing aggregates of different gradings according to claim 3, characterized in that: The knocking plate is arranged on the cross rod in an inclined manner and has a length greater than the minimum distance between the cross rod and the screening cylinder.

5. A machine for sizing aggregates of different gradings according to claim 4, characterized in that: The length of the poking piece is less than the minimum distance between the cross rod and the screening cylinder.

6. A machine for sizing aggregates of different gradings of concrete as claimed in claim 5, characterized in that: The connecting lug on the side with lower height is further provided with a support. The support is provided with a first hole coaxial with the axis of the cross rod. The cross rod is provided with a second hole corresponding to the circumferential position of the first hole. The first hole and the second hole have the same diameter.

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