Rotary grate bar pre-screening device

Abstract

The utility model relates to the field of environmental protection and sewage treatment, and discloses a rotary screen bar pre-screening device aiming at the problems that pre-screening equipment in existing sewage treatment is low in screening efficiency and poor in stability, the rotary screen bar pre-screening device comprises a rack, two main rotating shafts rotating in parallel are arranged in the rack in the horizontal direction, and the ends of the main rotating shafts are each sleeved with a redirection chain wheel; the redirection chain wheels on the end portions of the same sides of the two main rotating shafts are jointly meshed and sleeved with a traction chain, and therefore power transmission is achieved. The two traction chains are arranged in parallel, each traction chain comprises a plurality of chain plates connected end to end, pin shafts are arranged between the opposite chain plates on the two traction chains, each pin shaft is parallel to the main rotating shaft, a plurality of screening strips are distributed in the axial direction of the pin shaft in a sleeving mode, and the screening strips on the adjacent pin shafts are arranged in a staggered mode to form an efficient screening structure. And sleeves are arranged among the plurality of grate bars on the same pin shaft, so that the axial positioning of the grate bars is realized. The screening equipment has the effect of improving the screening efficiency and stability of the screening equipment.

Description

Technical Field

[0001] This application relates to the fields of environmental protection and wastewater treatment, and in particular to a rotary screen bar pre-screening device. Background Technology

[0002] In the fields of environmental protection and wastewater treatment, screening equipment is the core link in material particle size classification, and its operation determines the product quality and affects the stability of downstream equipment.

[0003] However, existing technologies face numerous challenges when dealing with materials with complex compositions, such as sewage sludge. Common screening equipment includes fixed grid screens, roller screens, and vibrating screens. While fixed grid screens, as a common screening device, can perform basic screening, their high clogging rate severely limits the flow rate, requiring frequent manual cleaning, which increases operating costs and maintenance difficulty. Roller screens and vibrating screens, although effective at intercepting complex components, are prone to wear on their seals and are susceptible to material and water ingress into the drive side. Long-term operation can lead to chain wear and breakage, frequent motor failures, and consequently affect the reliability and service life of the equipment.

[0004] The aforementioned solid-liquid separation equipment generally faces challenges such as easy accumulation of impurities, low screening efficiency, and easy equipment damage when dealing with complex materials, severely restricting the further improvement of wastewater treatment efficiency and capacity. Therefore, there is an urgent need for a more efficient, stable, and easy-to-maintain screening device to solve these problems. Utility Model Content

[0005] In order to improve the screening efficiency and stability of screening equipment, this application provides a rotary screen bar pre-screening device.

[0006] The rotary screen bar pre-screening device provided in this application adopts the following technical solution:

[0007] A rotary screen bar pre-screening device includes a frame with two main rotating shafts rotatably arranged horizontally within the frame. The two main rotating shafts are arranged parallel to each other, and a redirecting sprocket is fitted onto the end of each main rotating shaft. The redirecting sprockets on the same side of the two main rotating shafts mesh with a traction chain. Two traction chains are arranged parallel to each other, and each traction chain includes several chain plates connected end to end. A pin is rotatably arranged between the opposing chain plates on the two traction chains. Each pin is parallel to the main rotating shaft, and several screen bars are distributed along its own axial direction on each pin. The screen bars on adjacent pins are staggered, and the screen bars are rotatably fitted onto the corresponding pins. When the screen bars are driven to the upper layer by the traction chain, the screen bars automatically fall under the action of gravity and rest on the adjacent main rotating shafts to form a grid for screening materials. When the screen bars are driven to the lower layer by the traction chain, the screen bars rotate and droop under the action of gravity.

[0008] By adopting the above technical solution, the rotation of the main shaft drives the reversing sprocket and traction chain, causing the pin and screen bars to move accordingly. When the screen bars move to the upper layer, they automatically fall down and rest on the adjacent main shaft due to gravity, forming a grid to screen the fluid containing impurities. When the screen bars are driven to the lower layer by the traction chain, they rotate and droop under gravity, achieving automatic flipping and preventing impurities from accumulating on the pre-screening device. This not only improves the screening efficiency of the screening equipment but also reduces the possibility of impurities getting stuck on the grid surface and causing equipment damage, thereby improving the operational stability of the screening equipment.

[0009] Optionally, the screen bars are slidably sleeved on the corresponding pins, and each pin is also slidably sleeved with several sleeves. Each pin has one sleeve between two adjacent screen bars to isolate and support the two adjacent screen bars.

[0010] By adopting the above technical solution, the screen bars on the shaft are supported and isolated by sleeves, which facilitates the installation of screen bars and sleeves. Once a screen bar is damaged, it can be replaced simply by removing one side of the sleeve and the rest of the screen bars, thus improving the convenience of maintenance of the pre-screening device.

[0011] Optionally, each of the pins has a keyway along its own axial direction, and the inner wall of the sleeve has a guide key corresponding to the keyway along its own axial direction.

[0012] By adopting the above technical solution, the limiting sliding fit between the guide key and the keyway allows the sleeve to slide stably on the pin during installation, and ensures the relative position between the screen bar and the sleeve is stable, thereby improving the stability and durability of the pre-screening equipment.

[0013] Optionally, a limiting rod is provided on the side wall of the sleeve end parallel to its own axis, and a limiting arc groove is opened on the side wall of the screen bar facing the limiting rod. When the screen bar abuts against the side wall of the sleeve, the limiting rod is inserted into the limiting arc groove and rotates with the limiting arc groove.

[0014] By adopting the above technical solution, the limiting arc groove plays a limiting role in the rotation path of the limiting rod, which can limit the rotation range of the screen bar and prevent the screen bar from rotating excessively and affecting the screening effect.

[0015] Optionally, a drive motor is provided on one side of the frame, a drive sprocket is sleeved on the output shaft of the drive motor, a driven sprocket is sleeved at the end of one of the main rotating shafts, and a transmission chain is sleeved between the drive sprocket and the driven sprocket.

[0016] By adopting the above technical solution, a drive motor drives the active sprocket to rotate, which in turn drives the driven sprocket and the main shaft to rotate via a transmission chain, thus achieving automated screening. Furthermore, the separate design of the transmission device and the screening body reduces the impact of the impurities on the transmission device when the screening body screens fluids containing impurities.

[0017] Optionally, a cleaning roller is rotatably mounted on the frame parallel to the drive shaft away from the drive motor. The cleaning roller is used to clean up debris hanging on the shaft. Gears are fitted on the ends of the rotating shafts that extend from the side wall of the frame together with the drive shaft. The two gears are meshed together.

[0018] By adopting the above technical solution, the cleaning roller and the drive shaft rotate relative to each other under the action of gear meshing, which facilitates the cleaning of debris wrapped around the shaft and reduces the possibility of debris clogging between the pins and the screen bars, thereby improving the screening efficiency of the pre-screening device.

[0019] Optionally, a brush sleeve can be detachably provided on the cleaning roller, and the brush sleeve can be unfolded into a square brush mat along its own axis.

[0020] By adopting the above technical solution, the addition of the brush sleeve, due to its felt part, improves the cleaning efficiency of the hanging waste, and the brush sleeve unfolds into a square brush blanket along its own axis, which provides convenience for replacing and cleaning the brush sleeve, and further improves the screening efficiency of the pre-screening device.

[0021] Optionally, the brush sleeve is provided with adhesive Velcro between the connected sides after being wound.

[0022] By adopting the above technical solutions, the cost of hook and loop fasteners is lower, and the frequency of replacement due to damage or wear can be reduced. Furthermore, hook and loop fasteners can be reused multiple times, maintaining good adhesion even after repeated bonding and separation, resulting in a long service life. They facilitate the tight wrapping of brush sleeves around the cleaning roller, and further simplify the replacement and cleaning of the brush sleeves.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The rotation of the main shaft drives the redirecting sprocket and traction chain, causing the pins and screen bars to move accordingly. When the screen bars reach the upper layer, they automatically fall and rest on the adjacent main shaft due to gravity, forming a grid to screen the fluid containing impurities. When the screen bars are driven to the lower layer by the traction chain, they rotate and droop under gravity, automatically flipping over to prevent impurities from accumulating on the pre-screening device. This not only improves the screening efficiency of the screening equipment but also reduces the possibility of impurities getting stuck on the grid surface and causing equipment damage, thereby improving the stability of the screening equipment operation.

[0025] 2. The screen bars on the shaft are supported and isolated by sleeves, which facilitates the installation of screen bars and sleeves. Once a screen bar is damaged, the damaged screen bar can be replaced simply by removing one side of the sleeve and the rest of the screen bars, which improves the convenience of maintenance of the pre-screening device.

[0026] 3. The limiting sliding fit between the guide key and the keyway allows the sleeve to slide stably on the pin during installation, and ensures the relative position between the screen bar and the sleeve is stable, thereby improving the stability and durability of the pre-screening equipment;

[0027] 4. The dynamic grid design makes the screening process continuous and efficient, and the automatic flipping of the screen bars avoids the accumulation of debris, significantly improving screening efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0029] Figure 2 This is a schematic diagram illustrating the positional relationship between the cleaning roller and the drive shaft in an embodiment of this application.

[0030] Figure 3 This is a schematic diagram illustrating the connection relationship between the pin, screen bar, and sleeve in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Frame; 2. Main shaft; 3. Idling sprocket; 4. Traction chain; 41. Chain plate; 5. Transmission mechanism; 51. Drive motor; 52. Drive sprocket; 53. Driven sprocket; 54. Transmission chain; 6. Pin; 61. Keyway; 7. Screen bar; 71. Limiting arc groove; 8. Sleeve; 81. Guide key; 82. Limiting rod; 9. Cleaning roller; 91. Brush sleeve; 911. Velcro; 92. Gear. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0034] This application discloses a rotary screen bar pre-screening device.

[0035] Reference Figure 1 and Figure 2A rotary screen bar pre-screening device includes a frame 1. Two main rotating shafts 2 are rotatably mounted horizontally within the frame 1, arranged parallel to each other. A redirecting sprocket 3 is mounted at the end of each main rotating shaft 2. A traction chain 4 is meshed with the redirecting sprockets 3 located on the same side of the two main rotating shafts 2. A transmission mechanism 5 for driving one of the main rotating shafts 2 is located on one side of the frame 1. Two traction chains 4 are arranged parallel to each other, and each traction chain 4 consists of multiple chain plates 41 connected end-to-end. Pins 6 are rotatably mounted between the opposing chain plates 41 on the two traction chains 4. Each pin 6 is parallel to the main rotating shaft 2, and several screen bars 7 are distributed and mounted on each pin 6. The screen bars 7 on adjacent pins 6 are staggered, and each screen bar 7 is rotatably mounted on its corresponding pin 6.

[0036] Reference Figure 1 and Figure 2 During the screening process of fluids containing impurities in the pre-screening device, the transmission mechanism 5 drives the main shaft 2 to rotate. The rotation of the main shaft 2 drives the redirecting sprocket 3 to rotate synchronously, and the rotating redirecting sprocket 3 drives the traction chain 4. When the screen bar 7 is driven to the upper layer by the traction chain 4, it will automatically fall down due to gravity and rest on the adjacent main shaft, thus forming a grid to screen the material. When the screen bar 7 is driven to the lower layer by the traction chain 4, it will rotate and droop under the action of gravity, realizing automatic flipping.

[0037] Reference Figure 1 In this embodiment, the transmission mechanism 5 includes a drive motor 51, a drive sprocket 52, a driven sprocket 53, and a transmission chain 54. The drive motor 51 is mounted on one side of the frame 1, the drive sprocket 52 is fixedly sleeved on the output shaft of the drive motor 51, the driven sprocket 53 is fixedly sleeved on the end of the main shaft 2 extending from the redirecting sprocket 3, and the transmission chain 54 is engaged with both the drive sprocket 52 and the driven sprocket 53.

[0038] Reference Figure 3 To facilitate the replacement and maintenance of the screen bars 7, the screen bars 7 are slidably sleeved on the corresponding pins 6, and multiple sleeves 8 are slidably sleeved on each pin 6. Each pin 6 has a keyway 61 along its own axial direction, and a guide key 81 is provided on the inner side wall of the sleeve 8 along its own axial direction corresponding to the keyway 61. One sleeve 8 is provided on each pin 6 between two adjacent screen bars 7, which serves to isolate and support adjacent screen bars 7.

[0039] Reference Figure 3To limit the rotation range of the screen bar 7 and prevent it from rotating excessively and affecting the screening effect, a limiting rod 82 is fixedly installed on the side wall of the sleeve 8 end parallel to its own axis. A limiting arc groove 71 is opened on the side wall of the screen bar 7 facing the limiting rod 82. When the screen bar 7 abuts against the side wall of the sleeve 8, the limiting rod 82 is inserted into the limiting arc groove 71 and rotates with the limiting arc groove 71.

[0040] Reference Figure 1 and Figure 2 In order to improve the cleaning efficiency of the pre-screening device, a cleaning roller 9 is rotatably mounted on the frame 1 on the side of the drive shaft away from the drive motor 51. The cleaning roller 9 is used to clean the hanging garbage. A brush sleeve 91 is detachably mounted on the cleaning roller 9. The brush sleeve 91 can be unfolded into a square brush blanket along the axial direction. And Velcro 911 is provided between the connected sides of the brush sleeve 91 after it is rolled up.

[0041] Reference Figure 1 The cleaning roller 9 and the drive shaft extend from the side wall of the frame 1 and are both fitted with gears 92, which are meshed together.

[0042] The implementation principle of the rotary screen bar pre-screening device in this application embodiment is as follows: the main rotating shaft 2 drives the screen bars 7 to move and form a grid, thereby realizing the automatic rotation of the screen bars 7 and the effective screening of impurities. At the same time, by adopting the design of sleeve 8 to isolate the screen bars 7 and brush sleeve 91 connected by Velcro 911, the stability and cleaning efficiency of the equipment are further improved.

[0043] 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 rotary screen bar pre-screening device, characterized in that, The system includes a frame (1), within which two main shafts (2) are rotatably arranged in the horizontal direction. The two main shafts (2) are arranged parallel to each other, and a redirecting sprocket (3) is fitted onto the end of each main shaft (2). The redirecting sprockets (3) located on the same side of the two main shafts (2) are engaged with a traction chain (4). There are two traction chains (4) arranged parallel to each other. Each traction chain (4) includes several chain plates (41) connected end to end. A pin (6) is rotatably arranged between the opposing chain plates (41) on the two traction chains (4). The shafts (6) are all arranged parallel to the main rotating shaft (2), and each of the pins (6) has several screen bars (7) distributed along its own axial direction. The screen bars (7) on two adjacent pins (6) are staggered. Several screen bars (7) are rotatably sleeved on the corresponding pins (6). When the screen bars (7) are driven to the upper layer by the traction chain (4), the screen bars (7) automatically fall down under the action of gravity and rest on the adjacent main rotating shaft (2) to form a grid to screen the material. When the screen bars (7) are driven to the bottom layer by the traction chain (4), the screen bars (7) rotate and hang down under the action of gravity.

2. The rotary screen bar pre-screening device according to claim 1, characterized in that, The screen bar (7) is slidably sleeved on the corresponding pin (6), and each pin (6) is also slidably sleeved with a number of sleeves (8). Each sleeve (8) on a single pin (6) is provided between two adjacent screen bars (7) to isolate and support the two adjacent screen bars (7).

3. The rotary screen bar pre-screening device according to claim 2, characterized in that, Each of the pins (6) has a keyway (61) along its own axial direction, and the inner wall of the sleeve (8) has a guide key (81) corresponding to the keyway (61) along its own axial direction.

4. The rotary screen bar pre-screening device according to claim 3, characterized in that, A limiting rod (82) is provided on the side wall of the end of the sleeve (8) parallel to its own axis. A limiting arc groove (71) is opened on the side wall of the screen bar (7) facing the limiting rod (82). When the screen bar (7) abuts against the side wall of the sleeve (8), the limiting rod (82) is inserted into the limiting arc groove (71) and rotates with the limiting arc groove (71).

5. A rotary screen bar pre-screening device according to claim 1, characterized in that, A drive motor (51) is provided on one side of the frame (1). A drive sprocket (52) is sleeved on the output shaft of the drive motor (51). A driven sprocket (53) is sleeved on the end of one of the main rotating shafts (2). A transmission chain (54) is sleeved between the drive sprocket (52) and the driven sprocket (53).

6. A rotary screen bar pre-screening device according to claim 5, characterized in that, A cleaning roller (9) is rotatably mounted on the frame (1) on the side of the drive shaft away from the drive motor (51). The cleaning roller (9) is used to clean the debris hanging on the shaft. The cleaning roller (9) and the drive shaft extend together from the side wall of the frame (1) and are both fitted with gears (92). The two gears (92) are meshed together.

7. A rotary screen bar pre-screening device according to claim 6, characterized in that, The cleaning roller (9) is detachably provided with a brush sleeve (91), which can be unfolded into a square brush blanket along the axial direction.

8. A rotary screen bar pre-screening device according to claim 7, characterized in that, The brush sleeve (91) is provided with adhesive Velcro (911) between the connected sides after being wound up.

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