A mud ball screening conveyor

Abstract

The application relates to the technical field of conveyors, in particular to a mud block screening conveyor which comprises a box body arranged to be inclined to the right, the left side and the right side in the box body are respectively provided with roller drums, the two roller drums are drivingly connected through a conveying belt, the conveying belt is composed of a plurality of chain plates which are hingedly connected in a head-to-tail mode, a sieve hole is formed in each chain plate, a feeding port is formed in the right side of the upper end surface of the box body, and a feeding device is arranged at the corresponding position of the upper end surface of the box body and the feeding port. The upper adjusting device and the lower adjusting device are arranged, the sieve hole has a small opening degree when the chain plate is on the upside, the sieve hole prevents the sludge from passing through and enables the water to pass through, the purpose of effectively separating the sludge and the water is achieved, when the chain plate is on the downside and returns, the sieve hole of the chain plate is completely opened, the separated water and the small amount of sludge can smoothly pass through and flow into the water collecting hopper, the purpose of conveniently discharging the separated water is achieved, and the purposes of conveying and separating the mixture of the water and the sludge are well achieved.

Description

Technical Field

[0001] This application relates to the technical field of conveyors, and in particular to a mud block screening conveyor. Background Technology

[0002] Conveyors are used to transport materials and can be classified according to their operation: integrated loading and unloading conveyors, belt conveyors, screw conveyors, bucket elevators, roller conveyors, plate chain conveyors, mesh belt conveyors, and chain conveyors.

[0003] A search revealed Chinese Patent Publication No. CN117181585A, which discloses a material conveying and screening device, including a base, a conveying device, and a vibration mechanism. The conveying device is capable of active operation; a screening unit is installed on the conveying device and operates accordingly; the vibration mechanism causes the screening unit to vibrate, and the vibration mechanism includes a mounting base; a first component is installed on the screening unit at equal intervals, and a second component is installed on the mounting base in a fixed position. This invention, by respectively setting the first and second components on the screening unit and the mounting base, allows the first and second components to interact when the conveying device is actively operating, causing a localized area of ​​the screening unit to vibrate. When the material is conveyed by the conveying device, it receives sufficient vibration to shake off some impurities contained in the material during the conveying process, thus achieving screening. In this process, screening is performed on the material during conveying, simplifying the process, improving operational efficiency, and the vibration mechanism does not require a motor drive, saving energy.

[0004] The aforementioned material conveying and screening device has the effect of screening while transporting materials. However, the screen in the above scheme is prone to clogging during use, requiring machine shutdown for cleaning, which reduces the efficiency of conveying and screening. At the same time, the screen aperture is not adjustable. When conveying a mixture of water and sludge, if the screen aperture is too large, a large amount of sludge and water will fall from the screen at the same time, resulting in poor separation of sludge and water. If the screen aperture is too small, sludge and water can be effectively separated, allowing a large amount of water and a small amount of sludge to flow into the lower screen. However, if the screen aperture of the lower screen is too small, it is difficult for a large amount of water and a small amount of sludge to pass through quickly, causing poor discharge. Summary of the Invention

[0005] To address the problem that existing conveying and screening devices are inconvenient for screening mixtures of sludge and water, this application provides a mud block screening and conveying machine.

[0006] This application provides a mud block screening and conveying machine, which adopts the following technical solution: It includes a box body inclined to the right, with rollers respectively arranged on the left and right sides inside the box body. The two rollers are connected by a conveyor belt, which consists of several chain plates hinged end-to-end. Each chain plate has screen holes. A feed inlet is located on the right side of the upper end face of the box body, and a feeding device is located at the corresponding position of the feed inlet on the upper end face of the box body. A drive device is located on the left side of the upper end face of the box body, and the output end of the drive device is connected to the left roller. A water collection hopper is located on the right side of the lower end face of the box body, and a discharge hopper is located on the left side of the lower end face of the box body. Both the water collection hopper and the discharge hopper are connected to the internal space of the box body. The drive device drives the right roller to rotate through the left roller and the conveyor belt.

[0007] Each chain plate is equipped with a screen hole sealing device, and the inner side wall of the box is equipped with an upper adjustment device and a lower adjustment device to drive the screen hole sealing device to operate.

[0008] The upper adjustment device is used to adjust the screen hole closing device of the upper chain plate to deviate from the open position, and the lower adjustment device is used to adjust the screen hole closing device of the lower chain plate to be in the open position. The open position is the state where the screen hole is fully open. The upper and lower adjustment devices adjust the opening size of the screen hole of the chain plate through the screen hole closing device.

[0009] Optionally, the chain plate has a through groove along the front-to-back direction inside, and all the screen holes of the chain plate pass through the through groove. A movable plate is installed in the through groove of the chain plate, and the movable plate has several through holes corresponding to the screen holes of the chain plate. The upper adjustment device adjusts the movable plate to deviate from the open position in the through groove of the chain plate, and the through holes of the movable plate do not completely coincide with or do not coincide with the corresponding screen holes of the chain plate. When the chain plate moves to the return stroke, the movable plate inside the chain plate is adjusted by the lower adjustment device to be in the open position, and the through holes of the movable plate completely coincide with the screen holes of the lower chain plate, so that the screen holes of the lower chain plate are fully opened.

[0010] Optionally, the front and rear ends of the movable plate protrude from the front and rear sides of the chain plate, respectively. The upper adjustment device includes a sliding column fixedly mounted on the movable plate located on the outer side of the chain plate, and four track plates fixedly mounted on the inner side wall of the housing at positions corresponding to the chain plate along the direction of chain plate movement. The two upper track plates are located on the front and rear sides of the upper chain plate, and the two lower track plates are located on the front and rear sides of the lower chain plate. The upper end face of the upper track plate has a first track groove along the length of the track plate, and the lower end face of the lower track plate has a second track groove along the length of the track plate. When the movable plate is in the upper position, the free end of the sliding column of the movable plate is located in the first track groove of the upper track plate inside the housing. When the movable plate moves to the return stroke, the free end of the sliding column of the movable plate enters the second track groove of the lower track plate. The two upper track plates restrict the movable plate from deviating from the open position through the first track groove and the sliding column; the two lower track plates restrict the movable plate to the open position through the second track groove and the sliding column.

[0011] Optionally, the first track grooves of the two upper track plates are continuous wavy and parallel; the second track grooves of the two lower track plates are continuous wavy and parallel.

[0012] Optionally, each chain plate is symmetrically hinged with a pressing plate on both the front and rear sides. A limiting block perpendicular to the chain plate is fixedly installed on both the front and rear sides of the chain plate. A tension spring is installed between the limiting block and the corresponding pressing plate. One end of the tension spring is fixedly installed with the limiting block, and the other end of the tension spring is fixedly installed with the corresponding pressing plate. Two sets of pressing wheels are installed on the inner side wall of the box.

[0013] Optionally, the feeding device includes a mud pump fixedly installed on the upper surface of the box, with the output end of the mud pump corresponding to the feed inlet of the box.

[0014] Optionally, the drive device includes a motor fixedly mounted on the upper surface of the housing, with a drive wheel fixedly mounted on the output shaft of the motor, and the front end of the rotating shaft of the left roller extending to the outside of the housing and a pulley fixedly mounted coaxially thereon, with the drive wheel and the pulley connected by belt drive.

[0015] Optionally, flared openings are provided at the right end of the first track groove of the two upper track plates and the left end of the second track groove of the two lower track plates.

[0016] Optionally, a number of locking blocks are evenly fixed on the top of the extrusion plate on the front side of the chain plate along the left and right direction, and a number of locking slots are evenly opened on the top of the extrusion plate on the rear side of the chain plate along the left and right direction, with the locking blocks and locking slots corresponding to each other.

[0017] Optionally, the extrusion wheel is fixed to the inner wall of the box via a fixing rod, and the extrusion wheel is rotatably connected to the fixing rod.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] 1. This invention, by setting up an upper adjustment device and a lower adjustment device, allows the upper adjustment device to deviate the screen hole sealing device of the upper chain plate from the open position, while the lower adjustment device adjusts the screen hole sealing device of the lower chain plate to the open position. This results in a smaller opening of the screen holes when the chain plate is on the upper side, preventing sludge from passing through while allowing water to pass through, thus achieving the purpose of effectively separating sludge and water. Furthermore, when the chain plate is on the lower side during the return stroke, the screen holes of the chain plate are fully open, facilitating the smooth flow of the separated large amount of water and small amount of sludge into the water collection hopper, thus facilitating the discharge of the separated water. This invention effectively achieves the purpose of transporting and separating the mixture of water and sludge.

[0020] 2. This invention uses a movable plate inside the chain plate, which is adjusted by the upper adjustment device to deviate from the open position within the through groove of the chain plate. The through hole of the movable plate does not completely coincide with the corresponding screen hole of the chain plate, thus achieving the purpose of adjusting the opening of the screen hole of the chain plate to be smaller than the screen hole. When the chain plate moves to the return stroke, the movable plate inside the chain plate is adjusted by the lower adjustment device to be in the open position, and the through hole of the movable plate completely coincides with the screen hole of the lower chain plate, so that the screen hole of the lower chain plate is fully open, achieving the purpose of not affecting the flow of water and a small amount of sludge falling from the upper chain plate down to the inner bottom wall of the box. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure in the embodiments of this application;

[0022] Figure 2 This is a frontal structural schematic diagram of an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the box in the embodiment of this application;

[0024] Figure 4 This is a three-dimensional structural schematic diagram of the extrusion wheel in an embodiment of this application;

[0025] Figure 5 This is an embodiment of the present application. Figure 4 Enlarged schematic diagram of the structure at point A in the diagram;

[0026] Figure 6 This is a three-dimensional structural diagram of the two upper track plates in an embodiment of this application;

[0027] Figure 7 This is a three-dimensional structural diagram of the extrusion plate in an embodiment of this application;

[0028] Figure 8 This is an embodiment of the present application. Figure 7 Enlarged schematic diagram of the structure at point B in the diagram;

[0029] Figure 9 This is a schematic diagram of the three-dimensional structure of the chain plate in an embodiment of this application;

[0030] Figure 10 This is a three-dimensional structural diagram of the movable plate and the chain plate in the separated state in an embodiment of this application.

[0031] Reference numerals: 1. Box body; 2. Roller; 3. Chain plate; 4. Screen hole; 5. Feed inlet; 6. Water collection hopper; 7. Discharge hopper; 8. Through groove; 9. Movable plate; 10. Through hole; 11. Sliding column; 12. Track plate; 13. First track groove; 14. Flaring; 15. Extrusion plate; 16. Limiting block; 17. Tension spring; 18. Extrusion wheel; 19. Fixed rod; 20. Mud pump; 21. Motor; 22. Power wheel; 23. Pulley; 24. Belt. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 —10 provides further detailed description of this application.

[0033] This application discloses a mud block screening and conveying machine, including a box body 1 tilted to the right. Rollers 2 are respectively arranged on the left and right sides inside the box body 1. The two rollers 2 are connected by a conveyor belt. The conveyor belt is composed of several chain plates 3 that are hinged to each other end to end. Each chain plate 3 has a screen hole 4. A feed inlet 5 is opened on the right side of the upper end face of the box body 1. A feeding device is arranged on the upper end face of the box body 1 at the corresponding position of the feed inlet 5. A driving device is arranged on the left side of the upper end face of the box body 1. The output end of the driving device is connected to the left roller 2. A water collection hopper 6 is arranged on the right side of the lower end face of the box body 1. A discharge hopper 7 is arranged on the left side of the lower end face of the box body 1. Both the water collection hopper 6 and the discharge hopper 7 are connected to the internal space of the box body 1. The driving device drives the right roller 2 to rotate through the left roller 2 and the conveyor belt.

[0034] Each chain plate 3 is also equipped with a screen hole sealing device, and the inner side wall of the box body 1 is equipped with an upper adjustment device and a lower adjustment device to drive the screen hole sealing device to operate.

[0035] The upper adjustment device is used to adjust the screen hole closing device of the upper chain plate 3 to deviate from the open position, and the lower adjustment device is used to adjust the screen hole closing device of the lower chain plate 3 to be in the open position. The open position is the state where the screen hole 4 is fully open. The upper and lower adjustment devices adjust the opening size of the screen hole 4 of the chain plate 3 through the screen hole 4 closing device.

[0036] In use, the water and sludge mixture is fed through the feed inlet 5 of the housing 1 to the chain plate 3 via the feeding device. The drive device rotates the two rollers 2 and the chain plate 3, causing the chain plate 3 to transport the water and sludge mixture to the left and into the discharge hopper 7 for discharge, thus achieving the purpose of conveying the water and sludge mixture. During the conveying of the water and sludge mixture by the chain plate 3, the chain plate 3 generates mechanical vibration, causing water to flow downwards through the screen holes 4 of the chain plate 3 to the return chain plate 3, and then through the screen holes 4 on the return chain plate 3 to the inner bottom wall of the housing 1. Since the housing 1 is tilted to the right, the water on the inner bottom wall of the housing 1 flows to the right into the water collection hopper 6, achieving the separation of sludge and water. During use, it can... The upper adjustment device adjusts the screen hole sealing device of the upper chain plate 3 to be offset from the open position, so that the opening degree of the screen hole 4 of the upper chain plate 3 is smaller than the size of the screen hole 4. When the sludge is transported on the upper chain plate 3, a small part of the sludge falls through the screen hole 4 of the upper side and falls to the lower side. Most of the water can flow down from the screen hole 4 of the upper chain plate 3 to the lower chain plate 3. The lower adjustment device adjusts the screen hole sealing device of the lower chain plate 3 to the open position, so that the opening degree of the screen hole 4 of the lower chain plate 3 is fully opened, so that a small amount of sludge and water can smoothly fall through the screen hole 4 of the lower chain plate 3 onto the inner bottom wall of the box 1, and flow to the right into the water collection hopper 6 on the inner bottom wall of the box 1, thereby achieving effective separation of sludge and water.

[0037] In this embodiment, a through groove 8 is provided inside the chain plate 3 along the front-to-back direction. All the screen holes 4 of the chain plate 3 pass through the through groove 8. A movable plate 9 is provided in the through groove 8 of the chain plate 3. Several through holes 10 corresponding to the screen holes 4 of the chain plate 3 are provided on the movable plate 9. The upper adjustment device adjusts the movable plate 9 to deviate from the open position in the through groove 8 of the chain plate 3. The through holes 10 of the movable plate 9 do not completely overlap with the screen holes 4 of the chain plate 3, or do not overlap, so as to achieve the purpose of adjusting the size of the screen holes 4 of the chain plate 3 or sealing them. For example, the size of the screen holes 4 of the upper chain plate 3 is adjusted to be less than half of the screen holes 4. When the chain plate 3 moves to the return stroke, the movable plate 9 inside the chain plate 3 is adjusted to the open position by the lower adjustment device. The through holes 10 of the movable plate 9 completely overlap with the screen holes 4 of the lower chain plate 3, so that the screen holes 4 of the lower chain plate 3 are fully open, without affecting the water and a small amount of sludge falling from the upper chain plate 3 to flow down to the inner bottom wall of the box 1.

[0038] To achieve the purpose of adjusting the position of the movable plate 9 within the through groove 8 of the chain plate 3, in this embodiment, the front and rear ends of the movable plate 9 protrude from the front and rear sides of the chain plate 3, respectively. A sliding column 11 is fixedly installed on the movable plate 9 located on the outer side of the chain plate 3. A track plate 12 is fixedly installed on the inner side wall of the housing 1 at a position corresponding to the chain plate 3 along the movement direction of the chain plate 3. There are four track plates 12. The upper adjustment device consists of two upper track plates 12, and the lower adjustment device consists of two lower track plates 12. The two upper track plates 12 are located on the front and rear sides of the upper chain plate 3, and the two lower track plates 12 are located on the front and rear sides of the lower chain plate 3. The upper end face of the upper track plate 12 is opened along the length direction of the track plate 12. A first track groove 13 is provided, and a second track groove is provided on the lower end face of the lower track plate 12 along the length direction of the track plate 12. When the movable plate 9 is on the upper side, the free end of the sliding column 11 of the movable plate 9 is located in the first track groove 13 of the upper track plate 12 inside the box 1. When the movable plate 9 moves to the return stroke, the free end of the sliding column 11 of the movable plate 9 enters the second track groove of the lower track plate 12. The two upper track plates 12 restrict the movable plate 9 from deviating from the open position through the first track groove 13 and the sliding column 11, so that the opening of the screen hole 4 of the chain plate 3 is smaller than the size of the screen hole 4. The two lower track plates 12 restrict the movable plate 9 to the open position through the second track groove and the sliding column 11.

[0039] When the chain plate 3 moves, the chain plate 3 drives the front and rear sliding columns 11 to move synchronously through the movable plate 9, so that the sliding columns 11 slide in the first track groove 13 or the second track groove of the corresponding track plate 12. The first track groove 13 or the second track groove of the two track plates 12 restricts the forward and backward movement of the movable plate 9 through the sliding columns 11, thereby locking the position of the movable plate 9. When the movable plate 9 is in the upper position, it deviates from the open position, so that the through hole 10 of the movable plate 9 and the screen hole 4 of the chain plate 3 do not completely overlap, so that the opening of the screen hole 4 is smaller than the size of the screen hole 4, which facilitates the passage of water and prevents the passage of sludge, thereby improving the separation effect of sludge and water. When the movable plate 9 is in the lower return position, it is in the open position.

[0040] To facilitate the lower end of the sliding column 11 entering the corresponding first track groove 13 or second track groove, in this embodiment, the right end of the first track groove 13 of the two upper track plates 12 and the left end of the second track groove of the two lower track plates 12 are provided with flared openings 14. When the chain plate 3 moves, when the lower chain plate 3 enters the upper side from the return stroke through the right roller 2, the free end of the sliding column 11 of the movable plate 9 enters the first track groove 13 of the two upper track plates 12 through the flared opening 14. The track groove restricts the movable plate 9 from moving back and forth away from the open position. When the upper chain plate 3 enters the return stroke through the left roller 2, the free end of the sliding column 11 of the movable plate 9 enters the second track groove of the two lower track plates 12 through the flared opening 14.

[0041] To prevent the screen opening 4 from being blocked when the chain plate 3 moves to the upper side to separate the water and sludge mixture, in this embodiment, the first track groove 13 of the two upper track plates 12 is continuously wavy and parallel. When the chain plate 3 moves to the upper side to transport and separate the water and sludge mixture, the movable plate 9 deviates from the open position, and the opening of the screen opening 4 of the chain plate 3 is smaller than the size of the screen opening 4. The sliding column 11 of the movable plate 9 slides in the first track groove 13. Since the first track groove 13 is designed to be continuously wavy, the movable plate 9 will produce a slight back-and-forth movement with a small amplitude, which only causes a slight change in the opening of the screen opening 4, so that the screen opening 4 can vibrate continuously, reducing sludge blockage. In order to prevent the screen opening 4 of the lower chain plate 3 from being blocked when water and a small amount of sludge fall onto the lower chain plate 3, the second track groove of the two lower track plates 12 is continuously wavy and parallel.

[0042] To enhance the effect of separating the water and sludge mixture when the chain plate 3 moves to the upper side, in this embodiment, each chain plate 3 is symmetrically hinged with an extrusion plate 15 on both its front and rear sides. A limiting block 16 perpendicular to the chain plate 3 is fixedly installed on both the front and rear sides of the chain plate 3. A tension spring 17 is installed between the limiting block 16 and the corresponding extrusion plate 15. One end of the tension spring 17 is fixedly installed with the limiting block 16, and the other end is fixedly installed with the corresponding extrusion plate 15. In the absence of external force, the extrusion plate 15 is pulled by the tension spring 17 to abut against the limiting block 16, maintaining a perpendicular position to the chain plate 3, allowing for normal feeding. Two sets of extrusion rollers 18 are installed on the inner wall of the housing 1. When the upper chain plate 3 moves between the two sets of extrusion rollers 18, the two sets of extrusion rollers 18 force the extrusion plates 15 on both the front and rear sides to move towards the center, squeezing the sludge on the upper chain plate 3 and squeezing out the water, thus enhancing the effect of separating the water and sludge mixture.

[0043] To increase the stability of the contact state between the tops of the two extrusion plates 15 when they move towards the center, in this embodiment, a number of locking blocks are uniformly fixedly arranged at the top of the extrusion plate 15 on the front side of the chain plate 3 along the left and right directions, and a number of slots are uniformly opened at the top of the extrusion plate 15 on the rear side of the chain plate 3 along the left and right directions, with the locking blocks and slots corresponding to each other; when the two extrusion plates 15 move towards the center, the tops of the two extrusion plates 15 are engaged together by the locking blocks and slots, which limits the rotation of the extrusion plates 15 and increases the stability of the closed state of the extrusion plates 15.

[0044] In this embodiment, the extrusion wheel 18 is fixedly mounted to the inner side wall of the housing 1 via a fixing rod 19, and the extrusion wheel 18 is rotatably connected to the fixing rod 19.

[0045] In this embodiment, the feeding device includes a mud pump 20 fixedly installed on the upper surface of the box 1. The output end of the mud pump 20 is correspondingly set with the inlet 5 of the box 1, and the input end of the mud pump 20 is connected to the sludge tank.

[0046] In this embodiment, the driving device includes a motor 21 fixedly mounted on the upper surface of the housing 1. The output shaft of the motor 21 is fixedly mounted with a power wheel 22. The front end of the rotating shaft of the left roller 2 extends to the outside of the housing 1 and is coaxially fixedly mounted with a pulley 23. The power wheel 22 and the pulley 23 are connected by a belt 24.

[0047] The implementation principle of one embodiment of this application is as follows: In use, the motor 21 drives the left roller 2 to rotate sequentially through the power wheel 22, belt 24, and pulley 23. The left roller 2 drives the right roller 2 to rotate through the conveyor belt composed of interlocking chain plates 3. The mud pump 20 discharges the mixture of water and sludge into the upper chain plate 3 through the feed port 5 of the box 1. The upper chain plate 3 conveys the mixture of water and sludge and discharges it from the discharge hopper 7, thus achieving the purpose of conveying the mixture of water and sludge. When conveying the mixture of water and sludge, the movable plate 9 of the upper chain plate 3 deviates from the open position, making the opening of the screen hole 4 of the chain plate 3 smaller. Water and a small amount of sludge flow into the return chain plate through the screen hole 4 of the upper chain plate 3. On the return chain plate 3, the movable plate 9 is in the open position under the restriction of the second track groove of the two track plates 12 on the lower side. Water and a small amount of sludge flow through the screen holes 4 of the lower chain plate 3 to the lower end face of the box 1 and into the water collection hopper 6. At the same time, since the first track groove 13 and the second track groove are continuous wavy, the movable plate 9 is in a state of continuous back and forth vibration during the conveying, which causes the size of the screen holes 4 of the chain plate 3 to change slightly, avoiding the clogging of the screen holes 4 of the chain plate 3. Meanwhile, when the upper chain plate 3 is conveying the mixture of water and sludge, when it moves between the two sets of extrusion rollers 18, the extrusion plates 15 of the upper chain plate 3 move towards the middle to squeeze the sludge in the middle and squeeze out the water, which improves the separation effect of water and sludge.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mud block screening and conveying machine, comprising a box body (1) inclined to the right, characterized in that: Rollers (2) are respectively arranged on the left and right sides inside the box (1). The two rollers (2) are connected by a conveyor belt. The conveyor belt is composed of several chain plates (3) that are hinged to each other. Each chain plate (3) has a screen hole (4). A feed inlet (5) is opened on the right side of the upper end face of the box (1). A feeding device is arranged at the corresponding position of the feed inlet (5) on the upper end face of the box (1). A driving device is arranged on the left side of the upper end face of the box (1). The output end of the driving device is connected to the roller (2) on the left side. A water collection hopper (6) is arranged on the right side of the lower end face of the box (1). A discharge hopper (7) is arranged on the left side of the lower end face of the box (1). The water collection hopper (6) and the discharge hopper (7) are both connected to the internal space of the box (1). The driving device drives the roller (2) on the right side to rotate through the roller (2) on the left side and the conveyor belt. Each of the chain plates (3) is provided with a screen hole sealing device, and the inner side wall of the box (1) is provided with an upper adjustment device and a lower adjustment device for driving the screen hole sealing device to operate. The upper adjustment device is used to adjust the screen hole closing device of the upper chain plate (3) to deviate from the open position, and the lower adjustment device is used to adjust the screen hole closing device of the lower chain plate (3) to be in the open position. The open position is the state where the screen hole (4) is fully open. The upper adjustment device and the lower adjustment device adjust the opening size of the screen hole (4) of the chain plate (3) through the screen hole closing device. The chain plate (3) has a through groove (8) in the front-to-back direction. The sieve holes (4) of the chain plate (3) all pass through the through groove (8). A movable plate (9) is provided in the through groove (8) of the chain plate (3). The movable plate (9) has several through holes (10) corresponding to the sieve holes (4) of the chain plate (3). The upper adjustment device adjusts the movable plate (9) to deviate from the open position in the through groove (8) of the chain plate (3). The through holes (10) of the movable plate (9) do not completely overlap with the sieve holes (4) of the chain plate (3) or do not overlap. When the chain plate (3) moves to the return stroke, the movable plate (9) in the chain plate (3) is adjusted by the lower adjustment device to be in the open position. The through holes (10) of the movable plate (9) completely overlap with the sieve holes (4) of the lower chain plate (3), so that the sieve holes (4) of the lower chain plate (3) are fully open. The front and rear ends of the movable plate (9) protrude from the front and rear sides of the chain plate (3), respectively. A sliding column (11) is fixedly installed on the movable plate (9) located outside the chain plate (3). A track plate (12) is fixedly installed on the inner side wall of the box (1) at the position corresponding to the chain plate (3) along the movement direction of the chain plate (3). There are four track plates (12). The upper adjustment device is the two upper track plates (12), and the lower adjustment device is the two lower track plates (12). The two upper track plates (12) are located on the front and rear sides of the upper chain plate (3), and the two lower track plates (12) are located on the front and rear sides of the lower chain plate (3). The upper end surface of the upper track plate (12) is provided with a first track groove along the length direction of the track plate (12). 13) The lower end face of the lower track plate (12) is provided with a second track groove along the length direction of the track plate (12). When the movable plate (9) is located on the upper side, the free end of the sliding column (11) of the movable plate (9) is located in the first track groove (13) of the upper track plate (12) inside the box (1). When the movable plate (9) moves to the return stroke, the free end of the sliding column (11) of the movable plate (9) enters the second track groove of the lower track plate (12). The two upper track plates (12) restrict the movable plate (9) from deviating from the open position through the first track groove (13) and the sliding column (11). The two lower track plates (12) restrict the movable plate (9) to be in the open position through the second track groove and the sliding column (11). The first track groove (13) of the two upper track plates (12) is continuous and parallel; the second track groove of the two lower track plates (12) is continuous and parallel.

2. The mud block screening and conveying machine according to claim 1, characterized in that: The chain plate (3) is symmetrically hinged with extrusion plates (15) on both the front and rear sides. The chain plate (3) is fixedly provided with limiting blocks (16) perpendicular to the chain plate (3) on both the front and rear sides. A tension spring (17) is provided between the limiting block (16) and the corresponding extrusion plate (15). One end of the tension spring (17) is fixedly provided with the limiting block (16), and the other end of the tension spring (17) is fixedly provided with the corresponding extrusion plate (15). The inner side wall of the box (1) is provided with two sets of extrusion wheels (18).

3. The mud block screening and conveying machine according to claim 1, characterized in that: The feeding device includes a mud pump (20) fixedly installed on the upper end face of the box (1), and the output end of the mud pump (20) is correspondingly set with the feed inlet (5) of the box (1).

4. The mud block screening and conveying machine according to claim 1, characterized in that: The driving device includes a motor (21) fixedly mounted on the upper surface of the housing (1). The output shaft of the motor (21) is fixedly mounted with a power wheel (22). The front end of the rotating shaft of the left roller (2) extends to the outside of the housing (1) and is coaxially fixedly mounted with a pulley (23). The power wheel (22) and the pulley (23) are connected by a belt (24).

5. The mud block screening and conveying machine according to claim 1, characterized in that: The right end of the first track groove (13) of the two upper track plates (12) and the left end of the second track groove of the two lower track plates (12) are both provided with flared openings (14).

6. The mud block screening and conveying machine according to claim 2, characterized in that: The top of the extrusion plate (15) on the front side of the chain plate (3) is uniformly fixed with several card blocks along the left and right direction. The top of the extrusion plate (15) on the rear side of the chain plate (3) is uniformly opened with several card slots along the left and right direction. The card blocks are set in correspondence with the card slots.

7. The mud block screening and conveying machine according to claim 2, characterized in that: The extrusion wheel (18) is fixed to the inner wall of the box (1) via a fixing rod (19), and the extrusion wheel (18) is rotatably connected to the fixing rod (19).

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