Screening device of asphalt mixing station

Abstract

The invention belongs to the technical field of screening devices, and particularly relates to an asphalt mixing station screening device which comprises a screening frame, a support and a vibration assembly. The vibration assembly is arranged on the screening frame; a supporting frame is fixedly connected into the screening frame, and a screen is arranged on the supporting frame. The two ends of the screen are connected with the screening frame through fixing assemblies correspondingly. The fixing assembly comprises a hook plate and a protective pressing plate. The hook plate is hinged to the screening frame, the hook plate is connected with a driving piece, the hook plate is driven by the driving piece to rotate, and a bending part matched with the hook plate is arranged on the screen; the protective pressing plate is connected with the screening frame through a spring assembly. By means of the fixing mode that the hook plate is used for preliminary fixing, the protection pressing plate is pressed downwards, the hook plate is forced to be further hooked tightly through the inclined face, the driving assembly capable of changing the downward moving distance is combined, the pulling force borne by the screen can be accurately and conveniently adjusted, and therefore the tensioning degree of the screen is effectively controlled.

Description

Technical Field

[0001] This invention belongs to the technical field of screening devices, specifically relating to a screening device for an asphalt mixing plant. Background Technology

[0002] Asphalt mixture is a key material in road construction, and its quality directly affects the service life and performance of the pavement. As the core equipment for producing asphalt mixture, the asphalt mixing plant uses a first screening device to prevent large pieces of material from being accidentally inserted during operation; then it is fed into a heated drum for dry mixing.

[0003] In existing technologies, screens are typically fixed directly to the screen box using bolts or other fasteners. This method has several drawbacks: First, adjusting the screen tension is difficult. Insufficient tension can cause secondary vibration during vibratory screening, reducing screening efficiency and potentially leading to increased wear and shortened lifespan due to looseness; excessive tension, on the other hand, poses a risk of tearing. Second, when screen replacement is needed, the process of disassembling and installing bolts is cumbersome, time-consuming, and labor-intensive, resulting in prolonged downtime at the mixing plant and severely impacting production efficiency. Furthermore, screens are prone to clogging after operation, requiring manual cleaning, which increases maintenance costs and labor intensity. While some technologies have attempted to improve screen fixing and cleaning, their low level of integration fails to fundamentally solve the problem of achieving convenient and adjustable screen tension, rapid replacement, and efficient cleaning in a unified manner. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a screening device for asphalt mixing plants. This device allows for easy cleaning and replacement of the screen and adjustment of the angle of the receiving plate.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A screening device for an asphalt mixing plant includes a screening frame, a support frame, and a vibration assembly. The screening frame is connected to the support frame via a support spring. The vibration assembly is mounted on the screening frame. A support frame is fixedly connected inside the screening frame, and a screen is mounted on the support frame. Both ends of the screen are connected to the screening frame via fixing components; the fixing components include a hook plate and a protective pressure plate; the hook plate is hinged to the screening frame, and a driving component is connected to the hook plate to drive the hook plate to rotate; the screen has a bent portion that cooperates with the hook plate; the protective pressure plate is connected to the screening frame via a spring assembly; the inner side of the protective pressure plate has an inclined surface that cooperates with the hook plate; the protective pressure plate is connected to a driving component to drive the protective pressure plate to move downward. The screening frame is equipped with a replacement and cleaning component; the replacement and cleaning component includes a scraper and a moving component, the scraper is slidably connected to the screening frame, the moving component is connected to the scraper, and the scraper is driven to move by the moving component; a receiving plate is hinged on the screening frame; a hook mesh component is provided on the scraper, and the hook mesh component is connected to the screen or the tilt angle of the receiving plate can be changed.

[0006] The vibration assembly includes a vibration shaft, a first drive motor, and a vibration cam; the vibration shaft is rotatably connected to the screening frame, and the vibration cam is fixed on the vibration shaft; the output shaft of the first drive motor is connected to the vibration shaft.

[0007] The driving component includes a driving arm and a first driving cylinder; the hook plate is hinged to the screening frame via a hinge shaft, and the driving arm is fixedly connected to the hinge shaft; the cylinder body of the first driving cylinder is fixedly connected to the screening frame, and the piston rod of the first driving cylinder is slidably connected to the driving arm, with a corresponding connecting groove on the piston rod.

[0008] The spring assembly includes a guide rod and a spring; the guide rod is fixedly connected to the screening frame, the protective pressure plate is slidably connected to the guide rod, the spring is sleeved outside the guide rod, and the two ends of the spring are respectively connected to the protective pressure plate and the screening frame.

[0009] The drive assembly includes a drive plate and a second drive cylinder. The drive plate is slidably connected to the screening frame, and the two ends of the second drive cylinder are fixedly connected to the drive plate and the screening frame, respectively. A drive shaft is fixedly connected to the drive plate, and an arc-shaped pressure block that cooperates with the drive shaft is provided on the protective pressure plate.

[0010] The hook net assembly includes a lifting plate and a lifting cylinder. The lifting plate is connected to a scraper via the lifting cylinder, and a net hanging post is fixedly connected to the lifting plate.

[0011] The lifting plate is rotatably connected to a support wheel; the bottom of the receiving plate is provided with a support arc surface that cooperates with the support wheel; the receiving plate is provided with a support shaft, and a tension spring is provided between the support shaft and the screening frame.

[0012] It also includes a front baffle plate; the front end of the screen is provided with a limiting part; both ends of the front baffle plate are fixedly connected to the protective baffle plates in the two fixed components respectively.

[0013] The moving component includes a drive screw and a second drive motor. The drive screw is rotatably connected to the screening frame, the scraper is threadedly connected to the drive screw, and the output shaft of the second drive motor is connected to the drive screw.

[0014] The screening frame is fixed with a sliding rod that is slidably connected to the scraper, and the output shaft of the second drive motor is connected to the drive screw through a belt transmission mechanism.

[0015] Compared with the prior art, the beneficial effects of this invention are: By using a fixing method that involves initial fixation by a hook plate, downward pressure by a protective pressure plate, and further tightening of the hook plate by means of an inclined plane, combined with a drive component that can change the downward movement distance, the tension on the screen can be adjusted precisely and conveniently, thereby effectively controlling its tension.

[0016] The cleaning assembly is replaced by a hook-and-mesh assembly on the scraper that connects to the screen. With the automatic release and locking of the fixing assembly, the old screen is automatically pushed out, and the new screen is automatically pulled in and positioned. This process significantly reduces manual intervention and greatly shortens replacement time.

[0017] The same scraper assembly can move along the screen during non-replacement periods to scrape off residual debris attached to it, prevent clogging, keep the screen holes unobstructed, and thus ensure the stability of screening efficiency and product quality.

[0018] After the screen replacement is completed, the hook mesh assembly can be moved to the bottom of the receiving plate. By changing the contact point between the support wheel and the support arc surface of the receiving plate, the tilt angle of the receiving plate can be flexibly adjusted, thereby changing the initial state of material slippage, optimizing the material distribution and screening start conditions, and further improving the screening effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention in one direction; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a longitudinal sectional view of the present invention; Figure 4 yes Figure 3 A magnified view of a section at point F in the middle; Figure 5 This is a cross-sectional view of the present invention; Figure 6 yes Figure 5 A magnified view of a section at point B in the middle; Figure 7 This is a schematic diagram of the structure from another direction of the present invention; Figure 8 yes Figure 7 A magnified view of a section at point C; Figure 9 This is a schematic diagram of the structure of the present invention after the receiving plate is removed; Figure 10 yes Figure 9 A partial view of the area in D; Figure 11 yes Figure 10 A schematic diagram of the structure from another direction shown; Figure 12 yes Figure 11 A magnified view of a section at point E in the middle; Figure 13 This is a schematic diagram of the structure of the driving component 72 of the present invention; Wherein: 1 is the screening frame, 2 is the support, 3 is the vibration assembly, 30 is the vibration shaft, 31 is the first drive motor, 32 is the vibration cam, 4 is the support spring, 5 is the support frame, 6 is the screen, 60 is the bending part, 61 is the limiting part, 7 is the fixing assembly, 70 is the hook plate, 71 is the protective pressure plate, 72 is the driving component, 720 is the driving arm, 721 is the first drive cylinder, 722 is the connecting groove, 73 is the spring assembly, 730 is the guide rod, 731 is the spring, and 74 is the drive assembly. Components: 740 is the drive plate, 741 is the second drive cylinder, 742 is the drive shaft, 743 is the arc-shaped pressure block, 8 is the replacement cleaning assembly, 80 is the scraper, 81 is the moving assembly, 810 is the drive screw, 811 is the second drive motor, 82 is the receiving plate, 83 is the hook net assembly, 830 is the lifting plate, 831 is the lifting cylinder, 832 is the net hanging post, 833 is the support wheel, 84 is the support shaft, 85 is the tension spring, 86 is the slide rod, 87 is the belt drive mechanism, and 9 is the front pressure plate. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figure 1 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, an asphalt mixing plant screening device includes a screening frame 1, a support 2, and a vibration assembly 3. The screening frame 1 is connected to the support 2 via a support spring 4. The vibration assembly 3 is mounted on the screening frame 1. A support frame 5 is fixedly connected inside the screening frame 1, and a screen 6 is mounted on the support frame 5. The vibration assembly 3 drives the screening frame 1, the support frame 5, and the screen 6 to vibrate.

[0022] Both ends of the screen 6 are connected to the screening frame 1 via a fixing assembly 7. The fixing assembly 7 includes a hook plate 70 and a protective pressure plate 71. The hook plate 70 is hinged to the screening frame 1 and is connected to a driving component 72. The driving component 72 drives the hook plate 70 to rotate, causing the hook plate 70 to hook the bent part 60 on the screen 6, thus achieving initial fixation of the screen 6.

[0023] The protective pressure plate 71 is connected to the screening frame 1 via a spring assembly 73. The inner side of the protective pressure plate 71 has an inclined surface that engages with the hook plate 70. The protective pressure plate 71 is connected to a drive assembly 74, which drives the protective pressure plate 71 downwards. During the downward movement of the protective pressure plate 71, the spring assembly 73 generates elastic potential energy; and through the engagement of the inclined surface with the hook plate 70, the hook plate 70 further tightens the screen 6, achieving final fixation of the screen 6. Simultaneously, by changing the downward distance of the protective pressure plate 71, the tension applied by the hook plate 70 to the screen 6 can be changed, thus adjusting the tension of the screen 6.

[0024] The screening frame 1 is equipped with a replacement and cleaning component 8; the replacement and cleaning component 8 includes a scraper 80 and a moving component 81. The scraper 80 is slidably connected to the screening frame 1, and the moving component 81 is connected to the scraper 80. The scraper 80 is driven to move by the moving component 81. During the movement, the scraper 80 can scrape off the debris remaining on the screen 6 to achieve the purpose of cleaning.

[0025] A receiving plate 82 is hinged to the screening frame 1. The material first slides down through the receiving plate 82 and moves onto the screen 6 for screening. A hook mesh assembly 83 is provided on the scraper 80.

[0026] When the old screen 6 needs to be replaced, the scraper 80 first moves the old screen 6 and connects it to the screen 6 via the hook assembly 83; then the protective pressure plate 71 moves upward and the hook plate 70 rotates in the opposite direction to open, releasing the old screen 6 from its fixation; then the scraper 80 continues to move to push the old screen 6 out, the hook assembly 83 releases the old screen 6, and the old screen 6 is removed by workers or machinery; finally, the new screen 6 is connected to the hook assembly 83, the scraper 80 moves in the opposite direction to pull the new screen 6 into the support frame 5 of the screening frame 1; the hook plate 70 rotates to close and the protective pressure plate 71 moves downward to fix the new screen 6.

[0027] Once the new screen 6 is fixed, the hook mesh assembly 83 releases the new screen 6; the scraper 80 drives the hook mesh assembly 83 to move below the receiving plate 82, and the hook mesh assembly 83 changes the tilt angle of the receiving plate 82, thereby changing the initial angle and speed of the material sliding down.

[0028] Furthermore, such as Figure 1 As shown, the vibration assembly 3 includes a vibration shaft 30, a first drive motor 31, and a vibration cam 32. The vibration shaft 30 is rotatably connected to the screening frame 1, and the vibration cam 32 is fixed on the vibration shaft 30. The output shaft of the first drive motor 31 is connected to the vibration shaft 30, and the housing of the first drive motor 31 is fixedly connected to the screening frame 1. By driving the vibration shaft 30 and the vibration cam 32 to rotate through the output shaft of the first drive motor 31, and in conjunction with the support spring 4, the vibration of the screening frame 1, the support frame 5, and the screen 6 can be achieved.

[0029] Furthermore, such as Figure 6 , Figure 10 and Figure 13 As shown, the driving component 72 includes a driving arm 720 and a first driving cylinder 721; the hook plate 70 is hinged to the screening frame 1 via a hinge shaft, the hook plate 70 is fixedly connected to the hinge shaft, and the hinge shaft is hinged to the screening frame 1. The driving arm 720 is fixedly connected to the hinge shaft, the cylinder body of the first driving cylinder 721 is fixedly connected to the screening frame 1, the piston rod of the first driving cylinder 721 is slidably connected to the driving arm 720, and the piston rod is provided with a corresponding connecting groove 722.

[0030] When the piston rod of the first drive cylinder 721 extends, the lower part of the connecting groove 722 contacts the drive arm 720, and the drive arm 720, hinge shaft, and hook plate 70 rotate to open. When the piston rod of the first drive cylinder 721 retracts, the upper part of the connecting groove 722 contacts the drive arm 720, and the drive arm 720, hinge shaft, and hook plate 70 rotate in the opposite direction to close.

[0031] The purpose of the connecting groove 722 is to provide a certain clearance between the drive arm 720 and the piston rod, mainly to cooperate with the action of the protective pressure plate 71. When the protective pressure plate 71 moves down and contacts the hook plate 70, the piston rod of the first drive cylinder 721 extends, and the drive arm 720 is located in the middle of the connecting groove 722; thus, when the protective pressure plate 71 continues to press down, the hook plate 70 has sufficient space to move; and then the protective pressure plate 71 fixes the hook plate 70, and the first drive cylinder 721 does not participate in the subsequent fixation.

[0032] Furthermore, such as Figure 1 and Figure 2 As shown, the spring assembly 73 includes a guide rod 730 and a spring 731. The guide rod 730 is fixedly connected to the screening frame 1, and the protective pressure plate 71 is slidably connected to the guide rod 730. The spring 731 is sleeved on the outside of the guide rod 730, and its two ends are connected to the protective pressure plate 71 and the screening frame 1, respectively. When the protective pressure plate 71 moves downward, it compresses the spring 731; when the spring 731 releases its elasticity, it pushes the protective pressure plate 71 upward to reset.

[0033] Furthermore, such as Figure 1 and Figure 5As shown, the drive assembly 74 includes a drive plate 740 and a second drive cylinder 741. The drive plate 740 is slidably connected to the screening frame 1, and the two ends of the second drive cylinder 741 are fixedly connected to the drive plate 740 and the screening frame 1, respectively. A drive shaft 742 is fixedly connected to the drive plate 740, and an arc-shaped pressure block 743 that cooperates with the drive shaft 742 is provided on the protective pressure plate 71. When the piston rod of the second drive cylinder 741 extends, it pushes the drive plate 740 forward, and the drive shaft 742 contacts the arc-shaped pressure plate, generating downward pressure and causing the protective pressure plate 71 to move downward. When the piston rod of the second drive cylinder 741 retracts, the drive plate 740 moves backward, causing the drive shaft 742 to gradually move away from the arc-shaped pressure plate until the two no longer contact each other. The protective pressure plate 71 is pushed upward to reset by the spring 731.

[0034] Furthermore, such as Figure 6 As shown, the hook mesh assembly 83 includes a lifting plate 830 and a lifting cylinder 831. The lifting plate 830 is connected to the scraper 80 via the lifting cylinder 831. A hanging post 832 is fixedly connected to the lifting plate 830. Both ends of the lifting cylinder 831 are fixedly connected to the lifting plate 830 and the scraper 80, respectively. When the piston rod of the lifting cylinder retracts, the lifting plate 830 moves downward, causing the hanging post 832 to insert into the mesh of the screen 6, thus connecting the two. When the piston rod of the lifting cylinder 831 extends, the lifting plate 830 moves upward, causing the hanging post 832 to move out of the mesh of the screen 6.

[0035] Furthermore, such as Figure 6 As shown, a support wheel 833 is rotatably connected to the lifting plate 830; the bottom of the receiving plate 82 is provided with a support arc surface that cooperates with the support wheel 833; a support shaft 84 is provided on the receiving plate 82, and a tension spring 85 is provided between the support shaft 84 and the screening frame 1, with both ends of the tension spring 85 hinged to the support shaft 84 and the screening frame 1 respectively. When the scraper 80 moves to below the receiving plate 82 (away from the screen 6), the piston rod of the lifting rod is in the retracted state. At this time, by moving the scraper 80 to change the contact position between the support wheel 833 and the support arc surface, the tilt angle of the receiving plate 82 can be changed.

[0036] Furthermore, such as Figure 1 , Figure 7 and Figure 8 As shown, it also includes a front baffle plate 9; the front end of the screen 6 is provided with a limiting part 61, which hooks onto the front end of the support frame 5 after the screen 6 is installed. Both ends of the front baffle plate 9 are fixedly connected to the protective baffle plates 71 in the two fixing components 7. When the protective baffle plates 71 in the two fixing components 7 move down, they will drive the front baffle plate 9 to move down together, thereby fixing the limiting part 61 at the front end of the screen 6.

[0037] Furthermore, such as Figure 10As shown, the moving assembly 81 includes a drive screw 810 and a second drive motor 811. The drive screw 810 is rotatably connected to the screening frame 1, and the scraper 80 is threadedly connected to the drive screw 810. The output shaft of the second drive motor 811 is connected to the drive screw 810 and drives the drive screw 810 to rotate; when the drive screw 810 rotates, it causes the scraper 80 to move.

[0038] Furthermore, such as Figure 11 and Figure 12 As shown, a slide rod 86 is fixed on the screening frame 1 and slidably connected to the scraper 80. The output shaft of the second drive motor 811 is connected to the drive screw 810 through a belt transmission mechanism 87. Specifically, pulleys are provided on both the output shaft of the second drive motor 811 and the drive screw 810, and the two pulleys are connected by a belt drive.

[0039] The above description only illustrates preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

Claims

1. A screening device for an asphalt mixing plant, characterized in that: It includes a screening frame (1), a support (2) and a vibration assembly (3). The screening frame (1) is connected to the support (2) by a support spring (4). The vibration assembly (3) is set on the screening frame (1). A support frame (5) is fixedly connected inside the screening frame (1). A screen (6) is provided on the support frame (5). The two ends of the screen (6) are respectively connected to the screening frame (1) through the fixing component (7); the fixing component (7) includes a hook plate (70) and a protective pressure plate (71); the hook plate (70) is hinged to the screening frame (1), and the hook plate (70) is connected to a driving component (72), which drives the hook plate (70) to rotate. The screen (6) is provided with a bent part (60) that cooperates with the hook plate (70); the protective pressure plate (71) is connected to the screening frame (1) through a spring assembly (73); the inner side of the protective pressure plate (71) is provided with an inclined surface that cooperates with the hook plate (70); the protective pressure plate (71) is connected to a driving component (74), which drives the protective pressure plate (71) to move downward. The screening frame (1) is provided with a replacement cleaning component (8); the replacement cleaning component (8) includes a scraper (80) and a moving component (81). The scraper (80) is slidably connected to the screening frame (1), and the moving component (81) is connected to the scraper (80). The scraper (80) is driven to move by the moving component (81); a receiving plate (82) is hinged on the screening frame (1); a hook mesh component (83) is provided on the scraper (80). The hook mesh component (83) is connected to the screen (6) or changes the tilt angle of the receiving plate (82).

2. The asphalt mixing plant screening device according to claim 1, characterized in that: The vibration assembly (3) includes a vibration shaft (30), a first drive motor (31) and a vibration cam (32); the vibration shaft (30) is rotatably connected to the screening frame (1), and the vibration cam (32) is fixed on the vibration shaft (30); the output shaft of the first drive motor (31) is connected to the vibration shaft (30).

3. The asphalt mixing plant screening device according to claim 1, characterized in that: The driving component (72) includes a driving arm (720) and a first driving cylinder (721); the hook plate (70) is hinged to the screening frame (1) through a hinge shaft, and the driving arm (720) is fixedly connected to the hinge shaft; the cylinder body of the first driving cylinder (721) is fixedly connected to the screening frame (1), and the piston rod of the first driving cylinder (721) is slidably connected to the driving arm (720), and the piston rod is provided with a corresponding connecting groove (722).

4. The asphalt mixing plant screening device according to claim 1, characterized in that: The spring assembly (73) includes a guide rod (730) and a spring (731); the guide rod (730) is fixedly connected to the screening frame (1), the protective pressure plate (71) is slidably connected to the guide rod (730), the spring (731) is sleeved on the outside of the guide rod (730), and the two ends of the spring (731) are respectively connected to the protective pressure plate (71) and the screening frame (1).

5. The asphalt mixing plant screening device according to claim 1, characterized in that: The drive assembly (74) includes a drive plate (740) and a second drive cylinder (741). The drive plate (740) is slidably connected to the screening frame (1), and the two ends of the second drive cylinder (741) are fixedly connected to the drive plate (740) and the screening frame (1) respectively. A drive shaft (742) is fixedly connected to the drive plate (740), and an arc-shaped pressure block (743) that cooperates with the drive shaft (742) is provided on the protective pressure plate (71).

6. The asphalt mixing plant screening device according to claim 1, characterized in that: The hook net assembly (83) includes a lifting plate (830) and a lifting cylinder (831). The lifting plate (830) is connected to the scraper (80) through the lifting cylinder (831). A hanging net post (832) is fixedly connected to the lifting plate (830).

7. A screening device for an asphalt mixing plant according to claim 6, characterized in that: The lifting plate (830) is rotatably connected to a support wheel (833); the bottom of the receiving plate (82) is provided with a support arc surface that cooperates with the support wheel (833); the receiving plate (82) is provided with a support shaft (84), and a tension spring (85) is provided between the support shaft (84) and the screening frame (1).

8. The asphalt mixing plant screening device according to claim 1, characterized in that: It also includes a front baffle plate (9); the front end of the screen (6) is provided with a limiting part (61); the two ends of the front baffle plate (9) are respectively fixedly connected to the protective baffle plate (71) in the two fixed components (7).

9. A screening device for an asphalt mixing plant according to claim 1, characterized in that: The moving component (81) includes a drive screw (810) and a second drive motor (811). The drive screw (810) is rotatably connected to the screening frame (1). The scraper (80) is threadedly connected to the drive screw (810). The output shaft of the second drive motor (811) is connected to the drive screw (810).

10. A screening device for an asphalt mixing plant according to claim 9, characterized in that: The screening frame (1) is fixed with a slide rod (86) that is slidably connected to the scraper (80), and the output shaft of the second drive motor (811) is connected to the drive screw (810) through a belt transmission mechanism (87).

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