Roller screening device for grass leaves

Abstract

The invention provides a drum screening device for grass leaves, and relates to the technical field of traditional Chinese medicinal material screening, the drum screening device comprises a drum screen and a driving motor, a plurality of air blowing pipelines are arranged above the drum screen, the air blowing pipelines are connected with an air blower, and air outlets of the air blowing pipelines are obliquely provided with air baffles; the end of the air inlet pipe is connected with a piston cylinder, a piston is slidably connected into the piston cylinder, a reset spring is connected between the piston and the piston cylinder, a hammering roller is connected below the piston, the air inlet pipe is connected with an air outlet pipe, and the air inlet pipe is provided with an electromagnetic valve capable of controlling the air inlet pipe or the air outlet pipe to be opened in a one-way mode. The wind shield enables blown air to face the material collecting side, grass leaves in the screen holes are cleared away, meanwhile, the cleared grass leaves are blown to the collecting side, the electromagnetic valve controls the hammering roller to hammer the drum screen, the drum screen vibrates, and under the combined action of vibration of the drum screen and airflow in the air blowing pipeline, the unblocking effect of the screen holes can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of screening traditional Chinese medicinal materials, and particularly relates to a drum screening device for grass leaves. Background Art

[0002] Traditional Chinese medicinal materials are drugs used in traditional Chinese medicine for prevention and treatment of diseases. Among them, Chinese herbal medicines are a type of traditional Chinese medicinal materials, which are processed from the roots, stems, leaves, flowers, fruits, seeds, etc. of plants. Grass leaf-based traditional Chinese medicines usually refer to those traditional Chinese medicinal materials that mainly use the herbaceous stems and leaves of plants as medicinal parts. After the collected grass leaves are preliminarily crushed, it is necessary to screen out impurities such as sediment mixed in the grass leaves through screening to ensure the purity of the grass leaves and facilitate the next-step processing.

[0003] At present, the existing drum screening mechanism drives the drum sieve to rotate through a motor. The preliminarily crushed grass leaves are put into one end of the drum sieve. Under the rotation of the drum sieve, the crushed grass leaves are rotated, so that impurities such as sediment leak out through the filter screen, while the effective components such as grass leaves remain in the drum and are transported to the other end for collection under the guidance of the spiral blade.

[0004] For example, the patent with the publication number CN208177827U discloses a variable-frequency drum grass sieve. The drum grass sieve includes a drum rotatably arranged on a frame, a motor for driving the drum to rotate, a soil discharge port arranged below the drum, and a soil loading box. The motor drives the drum to rotate, and the herbs in the drum follow the rotation of the drum and are continuously turned over. During the rotation, under the action of centrifugal force, the herbs adhere to the screen, and the herbs are separated from the soil impurities and fine medicinal powder on the herbs. Moreover, the soil and medicinal powder fall on the screen and pass through the screen to enter the soil loading box from the soil discharge port on the frame, thereby completing the separation of the herbs from the soil impurities.

[0005] The above-mentioned drum grass sieve realizes the separation of herbs from impurities such as soil by driving the herbs to turn over through the rotation of the drum. However, when screening grass leaves, due to the different sizes of the grass leaves, some grass leaves may easily get stuck in the screen holes during the rotation with the sieve drum, resulting in blockage of the screen holes. This not only affects the efficiency of the sieve drum in screening impurities, but also, after the sieve drum completes the screening of the grass leaves, it is necessary to clean the grass leaves stuck in the screen holes, increasing the workload of grass leaf screening and further affecting the screening efficiency. Summary of the Invention

[0006] In view of this, the present invention provides a drum screening device for grass leaves, which solves the technical problem that in the prior art, during the rotation of grass leaves with the drum sieve, some grass leaves are likely to block the screen holes and affect the screening efficiency.

[0007] To solve the above technical problems, the present invention provides a drum screening device for grass leaves, which includes a drum screen and a driving motor for driving the drum screen to rotate. One end of the drum screen is provided with a feed inlet, and the other end is provided with a discharge outlet. Above the drum screen, there are multiple air blowing pipes, and the air blowing pipes are all connected to a hair dryer. At the air outlet of the air blowing pipe, a wind deflector is inclined, and the wind deflector is inclined from top to bottom towards the side close to the discharge outlet; An air inlet pipe is connected to the air blowing pipe, and the end of the air inlet pipe is connected to a piston cylinder. A piston is slidably connected in the piston cylinder. The lower end of the piston is provided with a rounded corner. A return spring is connected between the piston and the piston cylinder. Below the piston, there is a hammering roller that can abut against the drum screen. An air outlet pipe is connected to the air inlet pipe, and an electromagnetic valve that can control the one-way opening of the air inlet pipe or the air outlet pipe is provided on the air inlet pipe.

[0008] By adopting the above technical solution, the airflow in the air blowing pipe can blow the grass leaves stuck in the sieve holes of the drum screen, reducing the blockage of the sieve holes by the grass leaves during the rotation of the drum screen. A wind deflector is arranged at the air outlet of the air blowing pipe, so that the blown air is directed towards the material collection side. While clearing the grass leaves in the sieve holes, the cleared grass leaves are blown towards the collection side, reducing the impact on the grass leaves entering from the feed inlet, and at the same time reducing the residence time of the grass leaves in the drum, facilitating the rapid discharge of the grass leaves and reducing the risk of the grass leaves blocking the sieve holes again. When the blockage of the sieve holes by the grass leaves is relatively serious and the airflow in the air blowing pipe cannot blow the grass leaves in the sieve holes off, the air pressure in the air blowing pipe increases. The electromagnetic valve closes the air outlet pipe and opens the air inlet pipe, making the air inlet pipe communicate with the piston cylinder. The airflow pushes the piston and drives the hammering roller to move upward, and the return spring is compressed. When the hammering roller moves upward to a certain extent, the electromagnetic valve closes the air inlet pipe and opens the air outlet pipe. The air outlet pipe communicates with the piston cylinder, so that the airflow in the piston cylinder is released through the air outlet pipe, thereby reducing the air pressure in the piston cylinder. The piston and the hammering roller move downward under the action of their own gravity and the elastic force of the return spring, and the hammering roller hammers the drum screen, causing the drum screen to vibrate. Under the combined action of the vibration of the drum screen and the airflow in the air blowing pipe, it is beneficial to clean the grass leaves that are more seriously blocked in the sieve holes, helping to improve the clogging removal effect of the sieve holes.

[0009] Preferably, a negative pressure chamber is rotatably connected to one end of the drum screen close to the discharge outlet. A conical filter cover is arranged in the negative pressure chamber. The filter cover is connected to the drum screen through a connecting rod. A negative pressure fan is arranged on the negative pressure chamber.

[0010] By adopting the above technical solution, the negative pressure fan evacuates the negative pressure chamber and the drum screen, and cooperates with the airflow blown out by the air outlet pipe, which is beneficial to the rapid collection of the grass leaves in the drum screen, thereby reducing the blockage of the sieve holes by the grass leaves and improving the screening efficiency.

[0011] Preferably, a discharge hopper is arranged at the lower end of the negative pressure chamber, and a filter bag is connected to the air outlet end of the negative pressure fan.

[0012] By adopting the above technical solution, the filter cover filters the lifted sediment and grass leaves. The grass leaves fall from the discharge hopper, and the sediment passes through the filter cover and is collected in the filter bag.

[0013] Preferably, a baffle is provided between one end of the negative pressure chamber close to the negative pressure fan and the filter cover. The baffle is rotatably connected to the filter cover. The baffle divides the negative pressure chamber into an upper chamber and a lower chamber, and the negative pressure fan communicates with the upper chamber.

[0014] By adopting the above technical solution, the baffle divides the negative pressure chamber into an upper chamber and a lower chamber. The upper chamber is a negative pressure area. The negative pressure air flow in the upper chamber cooperates with the air flow blown out by the air outlet pipe, which is conducive to the rapid collection of grass leaves in the drum sieve. The air pressure in the lower chamber is relatively small, which is conducive to the grass leaves moving to the filter cover and falling into the discharge hopper along the inclined surface of the filter cover, thus facilitating the falling of the grass leaves.

[0015] Preferably, a plurality of blowing pipes are all communicated with the air distribution pipe. The blower is connected to the air distribution pipe. Both ends of the blowing pipe are connected to the collecting pipe. The collecting pipe is connected to the air inlet pipe. A reinforcing rod is connected between adjacent two piston cylinders.

[0016] By adopting the above technical solution, the air flow blown out by the blower reaches the blowing pipe through the air distribution pipe, blowing the grass leaves stuck in the sieve holes of the drum sieve. The air flow in the blowing pipe reaches the air inlet pipe through the collecting pipe. When the air flow in the blowing pipe cannot blow down the grass leaves in the sieve holes, the air pressure in the blowing pipe increases, so that the solenoid valve controls the hammering roller to hammer the drum sieve, which helps to improve the clogging clearing effect of the sieve holes. The reinforcing rod is conducive to increasing the stability between the two piston cylinders.

[0017] Preferably, a plurality of spiral blades are provided on the inner wall of the drum sieve.

[0018] By adopting the above technical solution, the spiral blades play a guiding role for the grass leaves in the drum sieve, which is conducive to the grass leaves moving from the feed port of the drum sieve to the discharge port, realizing the screening of the grass leaves.

[0019] Preferably, a housing is provided outside the drum sieve. The blower is arranged above the housing. The collecting pipe is connected to the housing through a mounting seat.

[0020] By adopting the above technical solution, the collecting pipe is installed on the housing through the mounting seat, which is conducive to increasing the stability of the collecting pipe, blowing pipe, air distribution pipe, air inlet pipe and piston cylinder.

[0021] Preferably, support rollers are rotatably connected to both sides of the drum sieve on the housing. The drive motor is arranged on the housing. The output shaft of the drive motor is connected to the support roller through a synchronous belt.

[0022] By adopting the above technical solution, the driving motor drives the supporting rollers to rotate, and the supporting rollers drive the drum screen to rotate through friction, realizing the screening of grass leaves.

[0023] Preferably, a transmission belt is provided below the drum screen on the housing, and the transmission belt is driven by a conveying motor provided on the housing.

[0024] By adopting the above technical solution, impurities such as sediment falling from the drum screen fall on the transmission belt, and the conveying motor drives the transmission belt to rotate, realizing the conveying of impurities.

[0025] Preferably, guide plates are inclinedly provided on both sides of the housing, and the two guide plates approach each other from top to bottom.

[0026] By adopting the above technical solution, the guide plates play a guiding role in the falling of impurities such as sediment, facilitating the smooth falling of the impurities on the transmission belt.

[0027] The beneficial effects of the above technical solutions of the present invention are as follows: 1. The airflow in the blowing pipeline of the present invention can blow the grass leaves stuck in the sieve holes of the drum screen, reducing the blockage of the sieve holes by the grass leaves during the rotation of the drum screen. The wind deflector at the air outlet makes the blown air face the material collection side. While clearing the grass leaves in the sieve holes, the blown grass leaves are blown towards the collection side, reducing the impact on the grass leaves entering from the feed port, and at the same time reducing the residence time of the grass leaves in the drum, facilitating the rapid discharge of the grass leaves and reducing the risk of the grass leaves blocking the sieve holes again. When the blockage of the sieve holes by the grass leaves is relatively serious and the airflow in the blowing pipeline cannot blow the grass leaves in the sieve holes, the solenoid valve controls the hammering roller to hammer the drum screen, causing the drum screen to vibrate. Under the combined action of the vibration of the drum screen and the airflow in the blowing pipeline, it is beneficial to clean the grass leaves that are more seriously blocked in the sieve holes, thus helping to improve the effect of clearing and unblocking the sieve holes.

[0028] 2. The negative pressure fan of the present invention evacuates the negative pressure cavity and the drum screen, and cooperates with the airflow blown out from the air outlet pipeline, which is beneficial to the rapid collection of the grass leaves in the drum screen, thereby reducing the blockage of the sieve holes by the grass leaves and improving the screening efficiency. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the drum screening device for grass leaves of the present invention; Figure 2 It is a sectional view of the housing and the negative pressure cavity of the present invention; Figure 3 It is a sectional view of the housing of the present invention; Figure 4 For Figure 3 The enlarged view at A in Figure 5 It is a sectional view of the piston cylinder of the present invention; Figure 6 Top view of the air distribution pipe and the blowing pipe of the present invention; Figure 7 Partial schematic view of the blowing pipe of the present invention; Figure 8 Cross-sectional view of the drum sieve of the present invention; Figure 9 Cross-sectional view of the drum screening device for grass leaves of the present invention.

[0030] In the figure: 1, drum sieve; 11, feed inlet; 12, discharge outlet; 13, spiral blade; 2, drive motor; 3, housing; 31, support roller; 32, guide plate; 33, synchronous belt; 4, transmission belt; 41, conveying motor; 5, hair dryer; 6, air distribution pipe; 61, blowing pipe; 611, wind baffle; 62, collecting pipe; 63, connecting pipe; 64, intake pipe; 65, outlet pipe; 66, solenoid valve; 661, valve core; 67, mounting seat; 7, piston cylinder; 71, piston; 72, guide rod; 73, connecting frame; 74, hammering roller; 75, return spring; 76, reinforcing rod; 8, negative pressure chamber; 81, upper chamber; 82, lower chamber; 83, discharge hopper; 84, negative pressure fan; 85, filter bag; 86, baffle; 87, filter cover; 88, connecting rod. Detailed implementation mode

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the Figures 1 - 9 of the embodiments of the present invention.

[0032] Embodiment This embodiment provides a drum screening device for grass leaves, as Figure 3 shown, including a drum sieve 1 and a drive motor 2 for driving the drum sieve 1 to rotate.

[0033] As Figure 1 and Figure 3 shown, the drum sieve 1 is rotatably installed in the housing 3, and the drum sieve 1 is provided with a plurality of sieve holes. On both sides of the drum sieve 1 on the housing 3, support rollers 31 are rotatably connected. The axis of the support roller 31 is parallel to the axis of the drum sieve 1, and the support roller 31 supports the drum sieve 1.

[0034] As Figure 3 shown, the drive motor 2 is arranged on the housing 3, and the output shaft of the drive motor 2 is connected to the support roller 31 through a synchronous belt 33. The drive motor 2 drives the synchronous belt 33 and the support roller 31 to rotate in sequence, and the support roller 31 drives the drum sieve 1 to rotate through friction.

[0035] As Figure 2 andFigure 8 As shown, one end of the drum sieve 1 is provided with a feed inlet 11, the other end is provided with a discharge outlet 12, and a plurality of spiral blades 13 are provided on the inner wall of the drum sieve 1. The spiral blades 13 play a guiding role for the grass leaves in the drum sieve 1, which is beneficial to the movement of the grass leaves from the feed inlet 11 of the drum sieve 1 to the discharge outlet 12, realizing the screening of the grass leaves.

[0036] As Figure 2 and Figure 3 shown, a conveyor belt 4 is provided below the drum sieve 1 on the housing 3, and the conveying direction of the conveyor belt 4 is parallel to the axial direction of the drum sieve 1. The conveyor belt 4 is driven by a conveying motor 41 provided on the housing 3. The sediment and other impurities falling from the drum sieve 1 fall on the conveyor belt 4, and the conveying motor 41 drives the conveyor belt 4 to rotate, realizing the conveying of the impurities.

[0037] As Figure 3 and Figure 9 shown, guide plates 32 are inclined on both sides of the housing 3, and the two guide plates 32 approach each other from top to bottom, and the drum sieve 1 is located between the two guide plates 32. The guide plates 32 play a guiding role for the falling of sediment and other impurities, facilitating the smooth falling of the impurities on the conveyor belt 4.

[0038] As Figure 2 shown, a blower 5 is installed above the housing 3, the blower 5 is connected to a cloth air pipe 6, the cloth air pipe 6 is located inside the housing 3 and above the drum sieve 1, the cloth air pipe 6 is arc-shaped, and a plurality of air blowing pipes 61 are connected to the cloth air pipe 6 at intervals, and the air blowing pipes 61 are parallel to the axis of the drum sieve 1. As Figure 7 shown, an air outlet is provided below the air blowing pipe 61, and a wind deflector 611 is inclined at the air outlet, and the wind deflector 611 is inclined from top to bottom towards the side close to the discharge outlet 12. The wind deflector 611 makes the blown air face the material collection side. While clearing the grass leaves in the sieve holes, the cleared grass leaves are blown towards the side close to the discharge outlet 12, reducing the impact on the grass leaves entering from the feed inlet 11, and at the same time reducing the residence time of the grass leaves in the drum, facilitating the rapid discharge of the grass leaves, thereby being beneficial to reducing the risk of the grass leaves blocking the sieve holes again.

[0039] As Figure 2 and Figure 6 shown, both ends of the air blowing pipe 61 are connected with a collecting pipe 62, the collecting pipe 62 is parallel to the cloth air pipe 6, and the collecting pipe 62 is connected to the housing 3 through a mounting seat 67.

[0040] As Figure 2 , Figure 4 and Figure 5As shown, a plurality of connecting pipes 63 are connected to the two collecting pipes 62 in opposite directions, and the axis of the connecting pipe 63 is parallel to the axis of the blowing pipe 61. An L-shaped intake pipe 64 is connected to the upper part of the connecting pipe 63. The end of the intake pipe 64 is connected to a piston cylinder 7. A piston 71 is slidably connected up and down in the piston cylinder 7. The lower end of the piston 71 is provided with a rounded corner. A guide rod 72 is slidably connected up and down in the piston cylinder 7, and the guide rod 72 is connected to the piston 71. A return spring 75 is connected between the piston 71 and the piston cylinder 7.

[0041] As Figure 5 shown, a connecting frame 73 is connected to the lower end of the piston 71, and a hammering roller 74 is rotatably connected to the connecting frame 73. The axis of the hammering roller 74 is parallel to the axis of the drum sieve 1.

[0042] As Figure 4 and Figure 5 shown, an L-shaped exhaust pipe 65 is connected above the intake pipe 64, and an electromagnetic valve 66 capable of controlling the one-way opening of the intake pipe 64 or the exhaust pipe 65 is provided on the intake pipe 64. The valve core 661 of the electromagnetic valve 66 is arranged between the intake pipe 64 and the exhaust pipe 65. Along the flow direction of the air flow on the intake pipe 64 are the valve core 661, the connection between the exhaust pipe 65 and the intake pipe 64, and the connection between the intake pipe 64 and the piston cylinder 7 in sequence.

[0043] As Figure 5 shown, through the switching of the valve core 661, the intake pipe 64 is opened, the exhaust pipe 65 is closed, the piston cylinder 7 is communicated with the intake pipe 64, and the air flow in the intake pipe 64 enters the piston cylinder 7; or the intake pipe 64 is closed, the exhaust pipe 65 is opened, the piston cylinder 7 is connected to the exhaust pipe 65, and the air flow in the piston cylinder 7 is released through the exhaust pipe 65.

[0044] As Figure 4 shown, a pressure sensor (not marked in the figure) is installed on the intake pipe 64, and a displacement sensor (not marked in the figure) is installed on the connecting frame 73. Both the pressure sensor and the displacement sensor are connected to a controller (not marked in the figure) through wireless signals, and the controller is connected to the electromagnetic valve 66 through wireless signals.

[0045] As Figure 4 and Figure 5 shown, when the blockage of the sieve holes by grass leaves is relatively serious and the air flow in the blowing pipe 61 cannot blow the grass leaves in the sieve holes off, the pressure sensor detects an increase in the air pressure in the intake pipe 64, and the controller controls the electromagnetic valve 66 to close the exhaust pipe 65 and open the intake pipe 64, so that the intake pipe 64 is communicated with the piston cylinder 7, and the air flow in the intake pipe 64 pushes the piston 71 and drives the hammering roller 74 to move upward, and the return spring 75 is compressed.

[0046] As Figure 4 and Figure 5As shown in the figure, when the displacement sensor detects that the connecting frame 73 and the hammering roller 74 have moved upward to a certain extent, the controller controls the solenoid valve 66 to close the air inlet pipe 64 and open the air outlet pipe 65. The air outlet pipe 65 is connected to the piston cylinder 7, so that the air flow in the piston cylinder 7 is released through the air outlet pipe 65, thereby reducing the air pressure in the piston cylinder 7. The piston 71 and the hammering roller 74 move downward under the action of their own gravity and the elastic force of the return spring 75, and the hammering roller 74 hammers the drum screen 1, causing the drum screen 1 to vibrate. The hammering roller 74 is rotatably installed on the connecting frame 73 to reduce the frictional resistance between the hammering roller 74 and the drum screen 1. Under the combined action of the vibration of the drum screen 1 and the air flow in the blowing pipe 61, it is beneficial to clean the grass leaves that are seriously blocked in the sieve holes, which helps to improve the clogging clearing effect of the sieve holes.

[0047] As Figure 2 shown, a reinforcing rod 76 is connected between two adjacent piston cylinders 7. The reinforcing rod 76 is beneficial to increasing the stability between the two piston cylinders 7.

[0048] As Figure 2 shown, one end of the drum screen 1 close to the discharge port 12 is rotatably connected with a negative pressure chamber 8. A conical filter cover 87 is arranged in the negative pressure chamber 8, and the axis of the filter cover 87 is parallel to the axis of the drum screen 1. The filter cover 87 is connected to the drum screen 1 through a connecting rod 88. The filter cover 87 is provided with filter holes, and a negative pressure fan 84 is arranged on the negative pressure chamber 8. The side of the filter cover 87 gradually approaches the axis direction of the filter cover 87 from the end far away from the negative pressure fan 84 to the end close to the negative pressure fan 84.

[0049] As Figure 2 shown, the negative pressure fan 84 evacuates the negative pressure chamber 8 and the drum screen 1, and cooperates with the air flow blown out by the air outlet pipe 65, which is beneficial to quickly collecting the grass leaves in the drum screen 1, thereby being beneficial to reducing the clogging of the sieve holes by the grass leaves and improving the screening efficiency.

[0050] As Figure 2 shown, a discharge hopper 83 is arranged at the lower end of the negative pressure chamber 8, and the discharge hopper 83 is located between the filter cover 87 and the discharge port 12. The air outlet end of the negative pressure fan 84 is connected with a filter bag 85. The filter cover 87 filters the lifted sediment and grass leaves. The grass leaves fall from the discharge hopper 83, and the sediment passes through the filter cover 87 and is collected in the filter bag 85.

[0051] As Figure 2 shown, a baffle 86 is horizontally arranged between one end of the negative pressure chamber 8 close to the negative pressure fan 84 and the filter cover 87. The baffle 86 is rotatably connected to the filter cover 87. The baffle 86 divides the negative pressure chamber 8 into an upper chamber 81 and a lower chamber 82, and the negative pressure fan 84 is communicated with the upper chamber 81.

[0052] As Figure 2As shown, under the action of the negative pressure fan 84, the upper chamber 81 is a negative pressure area. The negative pressure air flow in the upper chamber 81 cooperates with the air flow blown out by the air outlet pipe 65, which is conducive to quickly moving the grass leaves in the drum sieve 1 towards one end of the discharge port 12, thus facilitating the rapid screening of grass leaves and reducing the risk of blockage of the sieve holes by grass leaves. The discharge hopper 83 is arranged at the lower part of the lower chamber 82. The air pressure in the lower chamber 82 is relatively small, which is conducive to the grass leaves moving onto the filter cover 87 to fall along the inclined surface of the filter cover 87 into the discharge hopper 83, thus facilitating the falling of grass leaves.

[0053] The implementation principle of a drum screening device for grass leaves in this embodiment: The driving motor 2 drives the synchronous belt 33, the support roller 31 and the drum sieve 1 to rotate in sequence. The conveying motor 41 drives the transmission belt 4 to rotate, and the grass leaves to be screened are fed into the drum sieve 1 from the feed port 11. Driven by the spiral blade 13, the grass leaves move from one end of the feed port 11 to one end of the discharge port 12.

[0054] The air flow blown out by the blower 5 passes through the air distribution pipe 6 to reach the air blowing pipe 61. The wind deflector 611 at the air outlet of the air blowing pipe 61 makes the blown air face the material collection side. While clearing the grass leaves in the sieve holes, the cleared grass leaves are blown towards the side close to the discharge port 12.

[0055] The air flow in the air blowing pipe 61 passes through the collecting pipe 62 and the connecting pipe 63 in sequence and then reaches the air inlet pipe 64. When the blockage of the sieve holes by grass leaves is relatively serious and the air flow in the air blowing pipe 61 cannot blow the grass leaves in the sieve holes down, the air pressure sensor detects an increase in the air pressure in the air inlet pipe 64. The controller controls the solenoid valve 66 to close the air outlet pipe 65 and open the air inlet pipe 64, so that the air inlet pipe 64 is connected to the piston cylinder 7. The air flow in the air inlet pipe 64 pushes the piston 71 and drives the hammering roller 74 to move upward, and the return spring 75 is compressed.

[0056] When the displacement sensor detects that the connecting frame 73 and the hammering roller 74 have moved upward to a certain extent, the controller controls the solenoid valve 66 to close the air inlet pipe 64 and open the air outlet pipe 65. The air outlet pipe 65 is connected to the piston cylinder 7, so that the air flow in the piston cylinder 7 is released through the air outlet pipe 65, thereby reducing the air pressure in the piston cylinder 7. The piston 71 and the hammering roller 74 move downward under the action of their own gravity and the elastic force of the return spring 75, and the hammering roller 74 hammers the drum sieve 1, causing the drum sieve 1 to vibrate. Under the combined action of the vibration of the drum sieve 1 and the air flow in the air blowing pipe 61, it is conducive to clearing the grass leaves that are relatively seriously blocked in the sieve holes, which helps to improve the effect of clearing and unblocking the sieve holes.

[0057] The negative pressure fan 84 pumps air out of the negative pressure chamber 8 and the drum sieve 1, and cooperates with the airflow blown out by the air outlet pipe 65, which is beneficial to the rapid collection of grass leaves in the drum sieve 1. The filter hood 87 filters the lifted sediment and grass leaves. The grass leaves fall from the discharge hopper 83, and the sediment passes through the filter hood 87 and is collected in the filter bag 85.

[0058] In addition, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components.

Claims

1. A drum screening device for grass leaves, comprising a drum screen (1) and a drive motor (2) for driving the drum screen (1) to rotate. One end of the drum screen (1) is provided with a feed inlet (11), and the other end is provided with a discharge outlet (12), characterized in that: Above the rotary drum screen (1), there are multiple air blowing pipes (61). The air blowing pipes (61) are all connected to a hair dryer (5). At the air outlet of the air blowing pipe (61), a wind deflector (611) is inclined. The wind deflector (611) is inclined from top to bottom towards the side close to the discharge port (12). An air inlet pipe (64) is connected to the air blowing pipe (61). The end of the air inlet pipe (64) is connected to a piston cylinder (7). A piston (71) is slidably connected in the piston cylinder (7). The lower end of the piston (71) is provided with a rounded corner. A return spring (75) is connected between the piston (71) and the piston cylinder (7). A hammering roller (74) that can abut against the rotary drum screen (1) is connected below the piston (71). An air outlet pipe (65) is connected to the air inlet pipe (64). An electromagnetic valve (66) that can control the one-way opening of the air inlet pipe (64) or the air outlet pipe (65) is provided on the air inlet pipe (64).

2. The drum screening device for grass leaves according to claim 1, characterized in that: One end of the rotary drum screen (1) close to the discharge port (12) is rotatably connected to a negative pressure chamber (8). A conical filter cover (87) is provided in the negative pressure chamber (8). The filter cover (87) is connected to the rotary drum screen (1) through a connecting rod (88). A negative pressure fan (84) is provided on the negative pressure chamber (8).

3. The drum screening device for grass leaves according to claim 2, characterized in that: A discharge hopper (83) is provided at the lower end of the negative pressure chamber (8). The air outlet end of the negative pressure fan (84) is connected to a filter bag (85).

4. The drum screening device for grass blades according to claim 3, characterized in that: A baffle (86) is provided between one end of the negative pressure chamber (8) close to the negative pressure fan (84) and the filter cover (87). The baffle (86) and the filter cover (87) are rotatably connected. The baffle (86) divides the negative pressure chamber (8) into an upper chamber (81) and a lower chamber (82). The negative pressure fan (84) is communicated with the upper chamber (81).

5. The drum screening device for grass blades according to claim 4, characterized in that: Multiple air blowing pipes (61) are all communicated with a distributing pipe (6). The hair dryer (5) is connected to the distributing pipe (6). Both ends of the air blowing pipe (61) are connected to a collecting pipe (62). The collecting pipe (62) is connected to the air inlet pipe (64). A reinforcing rod (76) is connected between adjacent two piston cylinders (7).

6. The drum screening device for grass leaves according to claim 5, characterized in that: A plurality of spiral blades (13) are provided on the inner wall of the rotary drum screen (1).

7. The drum screening device for grass leaves according to claim 6, characterized in that: A housing (3) is provided outside the rotary drum screen (1). The hair dryer (5) is arranged above the housing (3). The collecting pipe (62) is connected to the housing (3) through a mounting seat (67).

8. The drum screening device for grass leaves according to claim 7, characterized in that: Support rollers (31) are rotatably connected to both sides of the housing (3) where the rotary drum screen (1) is located. A driving motor (2) is provided on the housing (3). The output shaft of the driving motor (2) is connected to the support roller (31) through a synchronous belt (33).

9. The drum screening device for grass leaves according to claim 8, characterized in that: A transmission belt (4) is provided below the rotary drum screen (1) on the housing (3). The transmission belt (4) is driven by a conveying motor (41) provided on the housing (3).

10. The drum screening device for grass blades according to claim 9, characterized in that: Guide plates (32) are inclined on both sides of the housing (3). The two guide plates (32) approach each other from top to bottom.

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