Concrete stone screening device

Abstract

The utility model belongs to the technical field of screening devices, and particularly relates to a concrete stone screening device which comprises a screening device body and a first baffle, the first baffle is fixedly connected to the screening device body, a through groove communicated with the outside is formed in a feeding port of the screening device body, and a second baffle is slidably connected into the through groove. A fixed block is fixedly connected to the screening device body; the limiting assembly is located in the fixing block and used for limiting the second baffle; the multiple first sliding grooves are formed in the inner wall of the screening device body, the multiple steel brushes are slidably connected between the multiple first sliding grooves correspondingly, and the multiple bidirectional threaded rods are in threaded connection between the multiple steel brushes correspondingly. The problem that the screening efficiency is affected due to the fact that the screening holes are likely to be blocked is solved, and it is ensured that dust in the screening device body cannot float to the outside.

Description

Technical Field

[0001] The utility model belongs to the technical field of screening devices, in particular to a concrete stone screening device. Background Art

[0002] Concrete stone screening device is a mechanical device specially used to screen the stone in concrete raw materials. It usually includes screening equipment such as vibrating screen, rotary vibrating screen or linear screen, which can effectively screen and separate the stone through specific screening principles and technologies.

[0003] The main function of the screening device is to classify the stone into different grades according to its particle size. Through screening, the oversized or undersized stone particles can be removed to ensure that the particle size distribution of the stone in the concrete raw materials meets the production requirements. This helps to improve the quality and performance of the concrete and ensure the uniformity and strength of the concrete.

[0004] For example, the Chinese patent with publication number CN218251395U discloses a vibrating screening device for asphalt concrete production, which includes: a frame, a screen is provided on the frame, the screen is connected to the frame through an elastic member, and a plurality of vibration motors are provided on the screen; a hopper is arranged above the screen; a guide plate is arranged in the hopper, a rotating shaft runs through the guide plate, and the rotating shaft is rotatably connected to the hopper; a swing assembly, which includes a gear, a rack and a transmission assembly. The present application can drive the rack to reciprocate through the transmission assembly, so that the rack can continuously drive the gear to rotate forward and reverse through the meshing transmission with the gear during the movement, thereby driving the guide plate to swing back and forth continuously, so that the stone can be evenly laid on the screen through the diversion effect of the guide plate, so that the screen surface of the screen can be fully utilized, thereby accelerating the screening efficiency of the stone, and at the same time, the evenly distributed stone can make the wear of the screen more uniform, so as to enhance the service life of the screen, and the practicability is strong.

[0005] The above patent has the following problems:

[0006] This patent has some disadvantages when used, such as: during the long-term use of the above screening device, the screen may be adhered by the material, resulting in the sieve holes being blocked, affecting the screening efficiency. In view of this, we propose a concrete stone screening device. Utility Model Content

[0007] The purpose of the utility model is to provide a concrete stone screening device to solve the problems raised in the above background technology.

[0008] In view of this, the utility model provides a concrete stone screening device, comprising:

[0009] A screening device body and a first baffle, wherein the first baffle is fixedly connected to the screening device body, a through slot communicating with the outside is provided on the feed port of the screening device body, a second baffle is slidably connected in the through slot, and a fixing block is fixedly connected to the screening device body;

[0010] A limiting component, the limiting component is located in the fixed block and is used to limit the second baffle;

[0011] A plurality of first chutes, wherein the plurality of first chutes are provided on the inner wall of the screening device body, a plurality of steel brushes are slidably connected between the plurality of first chutes, a plurality of bidirectional threaded rods are threadedly connected between the plurality of steel brushes, and the plurality of bidirectional threaded rods are respectively located in the plurality of first chutes and are rotatably connected to the plurality of first chutes;

[0012] A driving assembly, the driving assembly is located in the screening device body and is used to drive two bidirectional threaded rods therein to rotate;

[0013] Two movable grooves are symmetrically arranged in the screening device body and are respectively connected to the multiple first slide grooves. Multiple sprockets are rotatably connected in the two movable grooves, and one end of the multiple sprockets extends into the multiple first slide grooves and is fixed to one end of multiple bidirectional threaded rods. Two chains are respectively meshed between the multiple sprockets.

[0014] Based on the above structure, by setting the first slide groove and the steel brush, it is ensured that the multiple first slide grooves can slide between the multiple first slide grooves respectively, by setting the movable groove, the sprocket and the chain, by setting the driving assembly and the bidirectional threaded rod, it is ensured that the user can drive two of the bidirectional threaded rods to rotate through the driving assembly, and ensure that when two of the bidirectional threaded rods rotate, the two bidirectional threaded rods can drive the two sprockets to rotate in the two movable grooves respectively, so that the two sprockets respectively drive the other two sprockets to rotate through the two chains, and the other two sprockets respectively drive the other two bidirectional threaded rods to rotate, and when the multiple bidirectional threaded rods rotate, the multiple The steel brushes will be moved respectively by the action of the threads of multiple bidirectional threaded rods, so that the multiple steel brushes can clean the impurities adhered to the screen holes in the screening device body. By setting the first baffle, it is ensured that the first baffle can block the dust generated when the multiple steel brushes clean the impurities adhered to the surface of the screen in the screening device body within the screening device body. By setting the through groove and the second baffle, it is ensured that the second baffle can slide in the through groove and the second baffle can block the dust generated when the multiple steel brushes clean the impurities adhered to the surface of the screen in the screening device body within the screening device body. By setting the limit component, it is ensured that the user can limit the second baffle in the through groove through the limit component.

[0015] In the above technical solution, further, the limit assembly includes:

[0016] The second slide groove is arranged in the fixed block and communicated with the outside, a limiting block is slidably connected in the second slide groove, and the limiting block is attached to one side of the second baffle, and the bottom end of the limiting block is fixedly connected with a spring fixed to the inner wall of the second slide groove.

[0017] In this technical solution, it is ensured that the second baffle will not move due to the vibration of the screening device body.

[0018] In the above technical solution, further, the driving component includes:

[0019] Two first gear grooves, the two first gear grooves are symmetrically arranged in the screening device body and are respectively connected with two of the first chutes, two first bevel gears are respectively rotatably connected in the two first gear grooves, and one end of the two first bevel gears respectively extends into the two first chutes and is respectively fixed to the other end of two of the two-way threaded rods, a second bevel gear is meshed with one side of the first bevel gear, and the second bevel gear is located in the first gear groove and is rotatably connected to the first gear groove;

[0020] A second gear groove, wherein the second gear groove is provided in the screening device body and is connected to the two first gear grooves, wherein two third bevel gears are rotatably connected in the second gear groove, and one end of the two third bevel gears respectively extends into the two first gear grooves and is respectively fixed to the two second bevel gears, and a fourth bevel gear is meshed between the two third bevel gears;

[0021] The motor is fixedly connected to the screening device body, and the output shaft of the motor passes through the screening device body and extends into the second gear groove to be fixed to the fourth bevel gear, and the output shaft of the motor is rotatably connected to the screening device body.

[0022] In the technical solution, it is ensured that the sieve holes of the sieve on the screening device body can be cleaned to prevent clogging.

[0023] In the above technical solution, further, one end of the two first bevel gears are respectively rotatably connected to two of the first sliding grooves, and one end of the third bevel gear is rotatably connected to the first gear groove.

[0024] In the technical solution, it is ensured that one end of the two first bevel gears can rotate normally in two of the first sliding grooves respectively, and it is ensured that one end of the third bevel gear can rotate normally in the first gear groove.

[0025] In the above technical solution, further, the two sections of threads on the bidirectional threaded rod have opposite rotation directions.

[0026] In this technical solution, it is ensured that when the multiple bidirectional threaded rods rotate, the multiple steel brushes will be respectively affected by the threads of the multiple bidirectional threaded rods to move closer to or away from each other.

[0027] In the above technical solution, further, one end of the sprocket is rotatably connected to the first sliding groove.

[0028] In this technical solution, it is ensured that one end of the sprocket can rotate normally in the first sliding groove.

[0029] The beneficial effects of the utility model are:

[0030] 1. The concrete stone screening device ensures that the multiple first slide grooves can slide between the multiple first slide grooves respectively through the set first slide grooves and steel brushes, and ensures that the user can drive two of the two-way threaded rods to rotate through the set movable grooves, sprockets and chains, and through the set driving components and bidirectional threaded rods, to ensure that when two of the two-way threaded rods rotate, the two bidirectional threaded rods can drive two of the sprockets to rotate in the two movable grooves respectively, so that the two sprockets respectively drive the other two sprockets to rotate through the two chains, and the other two sprockets respectively drive the other two bidirectional threaded rods to rotate. When the multiple bidirectional threaded rods rotate, the multiple steel brushes will be moved respectively by the action of the threads of the multiple bidirectional threaded rods, so that the multiple steel brushes can clean up the impurities adhered to the sieve holes of the sieve in the screening device body, thereby solving the problem that the sieve holes may be clogged due to the adhesion of materials during the long-term use of the screening device, thereby affecting the screening efficiency.

[0031] 2. The concrete stone screening device, through the provision of the first baffle, ensures that the first baffle can block the dust generated when multiple steel brushes clean impurities adhered to the surface of the screen in the screening device body within the screening device body; through the provision of the through groove and the second baffle, ensures that the second baffle can slide in the through groove and allow the second baffle to block the dust generated when multiple steel brushes clean impurities adhered to the surface of the screen in the screening device body within the screening device body; and through the provision of the limit component, ensures that the user can limit the second baffle in the through groove through the limit component. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0033] Figure 2 It is a schematic diagram of a partial explosion structure of the utility model;

[0034] Figure 3 It is a schematic diagram of the internal structure of the fixed block of the utility model;

[0035] Figure 4It is a schematic diagram of the internal structure of the screening device body of the utility model;

[0036] Figure 5 It is a schematic diagram of the internal structure of the movable groove of the utility model.

[0037] The symbols in the figure are:

[0038] 1. Screening device body; 2. First baffle; 3. Through slot; 4. Second baffle; 5. Fixed block; 6. First slide slot; 7. Steel brush; 8. Bidirectional threaded rod; 9. Movable slot; 10. Sprocket; 11. Chain; 12. Second slide slot; 13. Limit block; 14. Spring; 15. First gear slot; 16. First bevel gear; 17. Second bevel gear; 18. Second gear slot; 19. Third bevel gear; 20. Fourth bevel gear; 21. Motor. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0040] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0042] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0043] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0044] Embodiment 1:

[0045] See also Figure 1 - Figure 5 As shown, this embodiment provides a concrete stone screening device, comprising:

[0046] A screening device body 1 and a first baffle 2, wherein the first baffle 2 is fixedly connected to the screening device body 1, a through slot 3 communicating with the outside is provided on the feed port of the screening device body 1, a second baffle 4 is slidably connected in the through slot 3, and a fixing block 5 is fixedly connected to the screening device body 1;

[0047] A limiting component, which is located in the fixing block 5 and is used to limit the second baffle 4;

[0048] A plurality of first chutes 6, the plurality of first chutes 6 are provided on the inner wall of the screening device body 1, a plurality of steel brushes 7 are slidably connected between the plurality of first chutes 6, a plurality of bidirectional threaded rods 8 are threadedly connected between the plurality of steel brushes 7, and the plurality of bidirectional threaded rods 8 are respectively located in the plurality of first chutes 6 and are rotatably connected to the plurality of first chutes 6;

[0049] A driving assembly, which is located in the screening device body 1 and is used to drive two bidirectional threaded rods 8 to rotate;

[0050] Two movable grooves 9 are symmetrically arranged in the screening device body 1 and are respectively connected to the multiple first slide grooves 6. Multiple sprockets 10 are rotatably connected in the two movable grooves 9, and one end of the multiple sprockets 10 extends into the multiple first slide grooves 6 and is fixed to one end of the multiple bidirectional threaded rods 8. Two chains 11 are respectively meshed between the multiple sprockets 10.

[0051] Embodiment 2:

[0052] This embodiment provides a concrete stone screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the limiting component includes:

[0053] The second slide groove 12 is opened in the fixed block 5 and communicated with the outside. The second slide groove 12 is slidably connected with a limit block 13, and the limit block 13 is attached to one side of the second baffle 4. The bottom end of the limit block 13 is fixedly connected with a spring 14 fixed to the inner wall of the second slide groove 12.

[0054] When in use, the user presses the limit block 13 by hand, allowing one end of the limit block 13 to enter the second slide groove 12 from the outside, and the other end of the limit block 13 compresses the spring 14, and then the user slides the second baffle 4 by hand to allow the second baffle 4 to slide in the through groove 3. When the second baffle 4 moves to a suitable position, the user releases the hand pressing the limit block 13 by hand, so that one end of the limit block 13 is against the bottom surface of the second baffle 4, and then continues to slide the second baffle 4 to expose the inner cavity of the screening device body 1 to the outside. Then the user pours the material into the screening device body 1, and then the user slides the second baffle 4 in the opposite direction by hand. When the second baffle 4 slides to a suitable position, one end of the limit block 13 will be moved from the second slide groove 12 to the outside by the rebound force of the spring 14, and the second baffle 4 will be restricted in the through groove 3 and cannot move, ensuring that the second baffle 4 will not be affected by the vibration of the screening device body 1 and move.

[0055] Embodiment 3:

[0056] This embodiment provides a concrete stone screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and the driving component includes:

[0057] Two first gear grooves 15, the two first gear grooves 15 are symmetrically arranged in the screening device body 1 and are respectively connected with two of the first chutes 6, two first bevel gears 16 are respectively rotatably connected in the two first gear grooves 15, and one end of the two first bevel gears 16 respectively extends into two of the first chutes 6 and is respectively fixed to the other end of two of the two-way threaded rods 8, a second bevel gear 17 is meshed with one side of the first bevel gear 16, and the second bevel gear 17 is located in the first gear groove 15 and is rotatably connected to the first gear groove 15;

[0058] A second gear groove 18 is provided in the screening device body 1 and communicates with the two first gear grooves 15. Two third bevel gears 19 are rotatably connected in the second gear groove 18, and one end of the two third bevel gears 19 extends into the two first gear grooves 15 respectively and is fixed to the two second bevel gears 17 respectively. A fourth bevel gear 20 is meshed between the two third bevel gears 19;

[0059] The motor 21 is fixedly connected to the screening device body 1 , and the output shaft of the motor 21 passes through the screening device body 1 and extends into the second gear groove 18 to be fixed to the fourth bevel gear 20 , and the output shaft of the motor 21 is rotationally connected to the screening device body 1 .

[0060] Among them, the user starts the screening device body 1 to let the screening device body 1 screen the material. When a large amount of impurities adhere to the screen holes of the screen in the screening device body 1 during a long screening process, and the screen holes of the screen are blocked, the user starts the motor 21 to let the output shaft of the motor 21 drive the fourth bevel gear 20 to rotate in the second gear groove 18. When the fourth bevel gear 20 rotates, the fourth bevel gear 20 will drive the two third bevel gears 19 to rotate in the second gear groove 18. When the two third bevel gears 19 rotate, one end of the two third bevel gears 19 will respectively drive the two second bevel gears 17 to rotate in the two first gear grooves 15, so that the two second bevel gears 17 respectively drive the two first bevel gears 16 to rotate in the two first gear grooves 15. When the two first bevel gears 16 rotate , the two first bevel gears 16 will drive two of the two-way threaded rods 8 to rotate in two of the first sliding grooves 6 respectively. When two of the two-way threaded rods 8 rotate, two of the two-way threaded rods 8 will respectively drive two of the sprockets 10 to rotate in the two movable grooves 9. When two of the sprockets 10 rotate, two of the sprockets 10 will respectively drive the other two sprockets 10 to rotate through two chains 11, so that the other two sprockets 10 respectively drive the other two two-way threaded rods 8 to rotate in the other two first sliding grooves 6. When multiple two-way threaded rods 8 rotate, multiple steel brushes 7 will be respectively affected by the threads of multiple two-way threaded rods 8 and approach each other, so that multiple steel brushes 7 can clean up the impurities adhered to the sieve holes of the screen on the screening device body 1, ensuring that the sieve holes of the screen on the screening device body 1 can be cleaned to prevent blockage.

[0061] Embodiment 4:

[0062] This embodiment provides a concrete stone screening device, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features: one end of the two first bevel gears 16 is rotatably connected to two of the first slide grooves 6 respectively, and one end of the third bevel gear 19 is rotatably connected to the first gear groove 15.

[0063] It is ensured that one end of the two first bevel gears 16 can rotate normally in two of the first sliding grooves 6 respectively, and it is ensured that one end of the third bevel gear 19 can rotate normally in the first gear groove 15 .

[0064] Embodiment 5:

[0065] This embodiment provides a concrete stone screening device, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the two sections of threads on the bidirectional threaded rod 8 have opposite rotation directions.

[0066] It is ensured that when the multiple bidirectional threaded rods 8 rotate, the multiple steel brushes 7 are respectively affected by the threads of the multiple bidirectional threaded rods 8 to move closer to or away from each other.

[0067] Embodiment 6:

[0068] This embodiment provides a concrete stone screening device, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features: one end of the sprocket 10 is rotatably connected to the first slide groove 6.

[0069] Here, it is ensured that one end of the sprocket 10 can rotate normally in the first sliding groove 6 .

[0070] When in use, the user presses the limit block 13 by hand, allowing one end of the limit block 13 to enter the second slide groove 12 from the outside, and the other end of the limit block 13 compresses the spring 14, and then the user slides the second baffle 4 by hand to let the second baffle 4 slide in the through groove 3. When the second baffle 4 moves to a suitable position, the user releases the hand pressing the limit block 13 by hand, so that one end of the limit block 13 is against the bottom surface of the second baffle 4, and then continues to slide the second baffle 4 to expose the inner cavity of the screening device body 1 to the outside, and then the user pours the material into the screening device body 1, and then the user slides the second baffle 4 in the opposite direction by hand. When the second baffle 4 slides When the screen body 1 is in the proper position, one end of the limit block 13 is moved from the second slide slot 12 to the outside by the rebound force of the spring 14, and the second baffle plate 4 is restricted in the through slot 3 and cannot move, ensuring that the second baffle plate 4 will not be affected by the vibration of the screening device body 1 and move. Then the user starts the screening device body 1 to allow the screening device body 1 to screen the material. When the screening device body 1 is in the long-term screening process and a large amount of impurities adhere to the sieve holes in the sieve mesh in the screening device body 1 and the sieve mesh holes are blocked, the user starts the motor 21 to allow the output shaft of the motor 21 to drive the fourth bevel gear 20 to rotate in the second gear slot 18. When the fourth bevel gear 20 rotates, the fourth bevel gear 20 will drive the two third bevel gears 19 to rotate in the second gear groove 18. When the two third bevel gears 19 rotate, one end of the two third bevel gears 19 will respectively drive the two second bevel gears 17 to rotate in the two first gear grooves 15, so that the two second bevel gears 17 respectively drive the two first bevel gears 16 to rotate in the two first gear grooves 15. When the two first bevel gears 16 rotate, the two first bevel gears 16 will drive two of the two-way threaded rods 8 to rotate in two of the first sliding grooves 6 respectively. When two of the two-way threaded rods 8 rotate, two of the two-way threaded rods 8 The threaded rod 8 will respectively drive two of the sprockets 10 to rotate in the two movable grooves 9. When two of the sprockets 10 rotate, two of the sprockets 10 will respectively drive the other two sprockets 10 to rotate through the two chains 11, so that the other two sprockets 10 respectively drive the other two bidirectional threaded rods 8 to rotate in the other two first slide grooves 6. When multiple bidirectional threaded rods 8 rotate, multiple steel brushes 7 will be respectively affected by the threads of the multiple bidirectional threaded rods 8 and approach each other, so that the multiple steel brushes 7 can clean up the impurities adhered to the sieve holes on the screening device body 1, ensuring that the sieve holes on the screening device body 1 can be cleaned to prevent blockage.

[0071] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A concrete stone screening device, characterized in that: include: A screening device body (1) and a first baffle (2), wherein the first baffle (2) is fixedly connected to the screening device body (1), a through slot (3) communicating with the outside is provided on the feed inlet of the screening device body (1), a second baffle (4) is slidably connected in the through slot (3), and a fixing block (5) is fixedly connected to the screening device body (1); A limiting component, the limiting component is located in the fixed block (5) and is used to limit the second baffle (4); A plurality of first chutes (6), wherein the plurality of first chutes (6) are arranged on the inner wall of the screening device body (1), a plurality of steel brushes (7) are slidably connected between the plurality of first chutes (6), a plurality of bidirectional threaded rods (8) are threadedly connected between the plurality of steel brushes (7), and the plurality of bidirectional threaded rods (8) are respectively located in the plurality of first chutes (6) and are rotatably connected to the plurality of first chutes (6); A driving assembly, the driving assembly being located in the screening device body (1) and being used for driving two bidirectional threaded rods (8) therein to rotate; Two movable grooves (9), the two movable grooves (9) are symmetrically arranged in the screening device body (1) and are respectively connected to the plurality of first slide grooves (6), the two movable grooves (9) are respectively rotatably connected with a plurality of sprocket wheels (10), and one end of the plurality of sprocket wheels (10) respectively extends into the plurality of first slide grooves (6) and is fixed to one end of a plurality of bidirectional threaded rods (8), and two chains (11) are respectively meshed between the plurality of sprocket wheels (10).

2. A concrete stone screening device according to claim 1, characterized in that: The limiting component comprises: A second slide groove (12), wherein the second slide groove (12) is provided in the fixed block (5) and is in communication with the outside, a limit block (13) is slidably connected in the second slide groove (12), and the limit block (13) is in contact with one side of the second baffle plate (4), and a spring (14) fixed to the inner wall of the second slide groove (12) is fixedly connected to the bottom end of the limit block (13).

3. A concrete stone screening device according to claim 1, characterized in that: The drive assembly comprises: Two first gear grooves (15), the two first gear grooves (15) are symmetrically arranged in the screening device body (1) and are respectively connected to two of the first chute grooves (6), two first bevel gears (16) are respectively rotatably connected in the two first gear grooves (15), and one end of the two first bevel gears (16) respectively extends into the two first chute grooves (6) and is respectively fixed to the other end of two of the two-way threaded rods (8), a second bevel gear (17) is meshed on one side of the first bevel gear (16), and the second bevel gear (17) is located in the first gear groove (15) and is rotatably connected to the first gear groove (15); a second gear groove (18), the second gear groove (18) being arranged in the screening device body (1) and being connected to the two first gear grooves (15); two third bevel gears (19) being rotatably connected in the second gear groove (18); one end of the two third bevel gears (19) respectively extending into the two first gear grooves (15) and respectively being fixed to the two second bevel gears (17); a fourth bevel gear (20) being meshed between the two third bevel gears (19); A motor (21), wherein the motor (21) is fixedly connected to the screening device body (1), and an output shaft of the motor (21) passes through the screening device body (1) and extends into the second gear groove (18) to be fixed to the fourth bevel gear (20), and the output shaft of the motor (21) is rotationally connected to the screening device body (1).

4. A concrete stone screening device according to claim 3, characterized in that: One end of the two first bevel gears (16) is rotatably connected to two of the first sliding grooves (6), and one end of the third bevel gear (19) is rotatably connected to the first gear groove (15).

5. The concrete stone screening device according to claim 1, characterized in that: The two sections of threads on the bidirectional threaded rod (8) have opposite rotation directions.

6. A concrete stone screening device according to claim 1, characterized in that: One end of the sprocket (10) is rotatably connected to the first sliding groove (6).

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