A drum screening device for grass leaves

Abstract

The application provides a drum screening device for grass leaves, and relates to the technical field of traditional Chinese medicinal material screening, which comprises a drum screen and a driving motor, a plurality of air blowing pipes are arranged above the drum screen, the air blowing pipes are connected with air blowers, and air outlets of the air blowing pipes are obliquely provided with wind baffles; an air inlet pipe is connected to the air blowing pipe, an end of the air inlet pipe is connected with a piston cylinder, a piston is slidably connected in the piston cylinder, a return spring is connected between the piston and the piston cylinder, a hammering roller is connected below the piston, an air outlet pipe is connected to the air inlet pipe, and an electromagnetic valve capable of controlling one-way opening of the air inlet pipe or the air outlet pipe is arranged on the air inlet pipe. The wind baffles of the application make the blown air flow towards the material collecting side, the grass leaves in the screen holes are cleaned out, and the cleaned grass leaves are blown towards the collecting side, the electromagnetic valve controls the hammering roller to hammer the drum screen, the drum screen is vibrated, and the vibration of the drum screen and the airflow in the air blowing pipe jointly help to improve the cleaning and unblocking effect of the screen holes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Chinese herbal medicine screening, in particular to a drum screening device for grass leaves. BACKGROUND

[0002] Chinese herbal medicine is a medicine used by traditional Chinese medicine to prevent and treat diseases, among which Chinese herbal medicine is one kind of Chinese herbal medicine, which is processed from roots, stems, leaves, flowers, fruits, seeds and other plant materials. The grass leaf type of Chinese herbal medicine usually refers to those mainly using the grass stems and leaf parts of plants as medicinal parts. After the collected grass leaves are preliminarily crushed, the impurities such as sand mixed in the grass leaves need to be screened out through screening to ensure the purity of the grass leaves and facilitate the next processing.

[0003] The current drum screening mechanism drives the drum screen to rotate by a motor, puts the preliminarily crushed grass leaves into one end of the drum screen, rotates the crushed grass leaves under the rotation of the drum screen, makes the impurities such as sand leak out through the filter screen, and the effective components such as grass leaves are left in the drum and transported to the other end under the guidance of the spiral blade for collection.

[0004] For example, a variable frequency drum grass screening machine is disclosed in a patent with the publication number CN208177827U. The drum grass screening machine includes a drum rotatingly arranged on a rack, a motor 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, the herbal medicine in the drum rotates with the drum and continuously overturns, in the process of rotation, under the action of centrifugal force, the herbal medicine is attached to the screen, the herbal medicine and the soil impurities and the fine herbal powder on the herbal medicine are separated, and the soil and the herbal powder fall on the screen and pass through the screen to enter the soil discharge port on the rack and then enter the soil loading box, thereby completing the separation of the herbal medicine and the soil impurities.

[0005] The above-mentioned drum grass screening machine realizes the separation of herbal medicine and impurities such as soil by the overturning of herbal medicine driven by the rotation of the drum. However, when screening the grass leaves, due to the different sizes of the grass leaves, a part of the grass leaves may be easily stuck in the screen holes during the rotation of the screen drum and cause the screen holes to be blocked. This not only affects the efficiency of the screen drum in screening impurities, but also increases the workload of grass leaf screening when the grass leaves stuck in the screen holes are cleaned after the screen drum completes the screening of the grass leaves, thereby affecting the screening efficiency. SUMMARY

[0006] Therefore, the present application provides a drum screening device for grass leaves, which solves the technical problem that a part of the grass leaves is easily blocked in the screen holes during the rotation of the screen drum, thereby affecting the screening efficiency.

[0007] To solve the above technical problems, the application provides a drum screening device for grass leaves, which comprises a drum screen and a driving motor for driving the drum screen to rotate, one end of the drum screen is provided with an inlet, the other end is provided with an outlet, a plurality of air blowing pipes are arranged above the drum screen, the air blowing pipes are connected with air blowers, a wind baffle is arranged at the air outlet of the air blowing pipe and is inclined from top to bottom to the side close to the outlet,

[0008] An air inlet pipe is connected with the air blowing pipe, the end of the air inlet pipe is connected with a piston cylinder, a piston is slidably connected in the piston cylinder, the lower end of the piston is provided with a round corner, a return spring is connected between the piston and the piston cylinder, a hammer roller capable of abutting against the drum screen is connected below the piston, an air outlet pipe is connected with the air inlet pipe, and a solenoid valve capable of controlling the one-way opening of the air inlet pipe or the air outlet pipe is arranged on the air inlet pipe.

[0009] By adopting the above technical scheme, the airflow in the air blowing pipe can blow the grass leaves stuck in the screen holes of the drum screen, reducing the blockage of the screen holes by the grass leaves during the rotation of the drum screen. The wind baffle is arranged at the air outlet of the air blowing pipe, so that the blown air is directed to the material collection side, the grass leaves in the screen holes are cleared out, and the cleared grass leaves are blown to the collection side, reducing the impact on the grass leaves entering from the inlet and the residence time of the grass leaves in the drum, facilitating the rapid discharge of the grass leaves, and being conducive to reducing the risk of the grass leaves blocking the screen holes again. When the blockage of the screen holes by the grass leaves is relatively serious and the airflow in the air blowing pipe cannot blow the grass leaves in the screen holes, the air pressure in the air blowing pipe increases, the solenoid valve closes the air outlet pipe and opens the air inlet pipe, so that the air inlet pipe is communicated with the piston cylinder, the airflow pushes the piston and drives the hammer roller to move upward, and the return spring is compressed. When the hammer roller moves to a certain degree, the solenoid valve closes the air inlet pipe and opens the air outlet pipe, so that the air outlet pipe is communicated with the piston cylinder, the airflow in the piston cylinder is released through the air outlet pipe, so that the air pressure in the piston cylinder is reduced, and the piston and the hammer roller move downward under the action of the gravity and the elastic force of the return spring, and the hammer roller hammers the drum screen, so that the drum screen vibrates. Under the joint action of the vibration of the drum screen and the airflow in the air blowing pipe, the grass leaves with relatively serious blockage in the screen holes are easily cleaned, and the cleaning effect of the screen holes is improved.

[0010] Preferably, a negative pressure cavity is rotatably connected to one end of the drum screen close to the outlet, a conical filter cover is arranged in the negative pressure cavity, the filter cover is connected with the drum screen through a connecting rod, and a negative pressure fan is arranged on the negative pressure cavity.

[0011] By adopting the above technical scheme, the negative pressure fan draws air from the negative pressure cavity and the drum screen, and cooperates with the airflow blown by the air outlet pipe, which is conducive to the rapid collection of the grass leaves in the drum screen, thereby reducing the blockage of the screen holes by the grass leaves and improving the screening efficiency.

[0012] Preferably, an outlet hopper is arranged at the lower end of the negative pressure cavity, and a filter bag is connected to the air outlet end of the negative pressure fan.

[0013] By adopting the technical scheme, the filter cover filters the raised silt and grass leaves, the grass leaves fall from the discharge hopper, and the silt passes through the filter cover and is collected in the filter bag.

[0014] Preferably, a baffle is arranged between one end of the negative pressure cavity close to the negative pressure fan and the filter cover, the baffle is rotationally connected with the filter cover, the baffle divides the negative pressure cavity into an upper chamber and a lower chamber, and the negative pressure fan is in communication with the upper chamber.

[0015] By adopting the technical scheme, the baffle divides the negative pressure cavity into the upper chamber and the lower chamber, the upper chamber is a negative pressure area, the negative pressure airflow in the upper chamber cooperates with the airflow blown out by the air outlet pipeline, which is conducive to the rapid collection of the grass leaves in the drum screen, and the air pressure in the lower chamber is small, which is conducive to the grass leaves moving to the filter cover falling into the discharge hopper along the inclined surface of the filter cover, thereby facilitating the falling of the grass leaves.

[0016] Preferably, the plurality of air blowing pipelines are in communication with the air distribution pipeline, the air blower is connected with the air distribution pipeline, both ends of the air blowing pipeline are connected with the collecting pipeline, the collecting pipeline is connected with the air inlet pipeline, and the reinforcing rod is connected between the two adjacent piston cylinders.

[0017] By adopting the technical scheme, the airflow blown out by the air blower reaches the air blowing pipeline through the air distribution pipeline, blows the grass leaves stuck in the screen holes of the drum screen, the airflow in the air blowing pipeline reaches the air inlet pipeline through the collecting pipeline, when the airflow in the air blowing pipeline cannot blow the grass leaves in the screen holes, the air pressure in the air blowing pipeline increases, thereby the electromagnetic valve controls the hammering roller to hammer the drum screen, which helps to improve the screen hole unblocking effect. The reinforcing rod is conducive to increasing the stability between the two piston cylinders.

[0018] Preferably, a plurality of spiral blades are arranged on the inner wall of the drum screen.

[0019] By adopting the technical scheme, the spiral blades play a guiding role on the grass leaves in the drum screen, which is conducive to the movement of the grass leaves from the feeding port to the discharge port of the drum screen, and realizes the screening of the grass leaves.

[0020] Preferably, the drum screen is externally provided with a shell, the air blower is arranged above the shell, and the collecting pipeline is connected with the shell through the mounting seat.

[0021] By adopting the technical scheme, the collecting pipeline is mounted on the shell through the mounting seat, which is conducive to increasing the stability of the collecting pipeline, the air blowing pipeline, the air distribution pipeline, the air inlet pipeline and the piston cylinder.

[0022] Preferably, support rollers are rotationally connected with both sides of the drum screen on the shell, a driving motor is arranged on the shell, and the output shaft of the driving motor is connected with the support rollers through a synchronous belt.

[0023] By adopting the technical scheme, the driving motor drives the supporting roller to rotate, and the supporting roller drives the drum screen to rotate through friction, so that the grass leaves are screened.

[0024] Preferably, a transmission belt is arranged below the drum screen on the shell.

[0025] By adopting the technical scheme, the impurities such as silt falling from the drum screen fall on the transmission belt, and the transmission belt is driven to rotate by the conveying motor, so that the impurities are conveyed.

[0026] Preferably, the two sides of the shell are both inclined and provided with guide plates, and the two guide plates are close to each other from top to bottom.

[0027] By adopting the technical scheme, the guide plates guide the falling of the impurities such as silt, so that the impurities can fall on the transmission belt smoothly.

[0028] The beneficial effects of the above technical scheme of the present application are as follows:

[0029] 1. The airflow in the blowing pipe can blow the grass leaves stuck in the screen holes of the drum screen, reduce the blockage of the screen holes by the grass leaves during the rotation of the drum screen, and the wind shield at the air outlet can blow the airflow towards the material collection side, so that the grass leaves in the screen holes are cleaned out and blown to the collection side, reducing the impact on the grass leaves entering from the feeding port and 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 screen holes again. When the blockage of the screen holes by the grass leaves is relatively serious and the airflow in the blowing pipe cannot blow the grass leaves in the screen holes, the electromagnetic valve controls the hammering roller to hammer the drum screen, so that the drum screen vibrates, and the vibration of the drum screen and the airflow blown by the blowing pipe can help to clean the grass leaves in the screen holes, thereby improving the cleaning effect of the screen holes.

[0030] 2. The negative pressure fan of the present application can extract air from the negative pressure cavity and the drum screen, and cooperate with the airflow blown by the air outlet pipe, so as to facilitate the rapid collection of the grass leaves in the drum screen, thereby reducing the blockage of the screen holes by the grass leaves and improving the screening efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic view of the drum screening device for grass leaves of the present application.

[0032] Figure 2 It is a sectional view of the shell and the negative pressure cavity of the present application.

[0033] Figure 3 It is a sectional view of the shell of the present application.

[0034] Figure 4 It is Figure 3An enlarged view of the middle A;

[0035] Figure 5 A sectional view of the piston cylinder of the present application;

[0036] Figure 6 A top view of the air distribution pipe and air blowing pipe of the present application;

[0037] Figure 7 A partial schematic view of the air blowing pipe of the present application;

[0038] Figure 8 A sectional view of the drum screen of the present application;

[0039] Figure 9 A sectional view of the drum screening device for grass leaves of the present application.

[0040] In the figure: 1, drum screen; 11, feeding port; 12, discharging port; 13, helical blade; 2, driving motor; 3, housing; 31, supporting roller; 32, guide plate; 33, synchronous belt; 4, transmission belt; 41, conveying motor; 5, air blower; 6, air distribution pipe; 61, air blowing pipe; 611, wind baffle; 62, collecting pipe; 63, connecting pipe; 64, air inlet pipe; 65, air outlet pipe; 66, electromagnetic valve; 661, valve core; 67, mounting seat; 7, piston cylinder; 71, piston; 72, guide rod; 73, connecting frame; 74, hammer roller; 75, return spring; 76, reinforcing rod; 8, negative pressure cavity; 81, upper chamber; 82, lower chamber; 83, discharging hopper; 84, negative pressure fan; 85, filter bag; 86, baffle; 87, filter cover; 88, connecting rod. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the embodiments of the present application with the drawings of the embodiments of the present application to make a brief description. Figures 1-9 The technical scheme of the embodiments of the present application is described clearly and completely.

[0042] EMBODIMENT

[0043] The present embodiment provides a drum screening device for grass leaves, as shown in the figure, which comprises a drum screen 1 and a driving motor 2 for driving the drum screen 1 to rotate. Figure 3 As shown in the figure, the drum screen 1 is rotatably installed in a housing 3, and a plurality of screen holes are arranged on the drum screen 1. A supporting roller 31 is rotatably connected to each side of the housing 3 and parallel to the axis of the drum screen 1, and the supporting roller 31 supports the drum screen 1.

[0044] As shown in the figure, the drum screen 1 is rotatably installed in a housing 3, and a plurality of screen holes are arranged on the drum screen 1. A supporting roller 31 is rotatably connected to each side of the housing 3 and parallel to the axis of the drum screen 1, and the supporting roller 31 supports the drum screen 1. Figure 1 and Figure 3 As shown in the figure, the drum screen 1 is rotatably installed in a housing 3, and a plurality of screen holes are arranged on the drum screen 1. A supporting roller 31 is rotatably connected to each side of the housing 3 and parallel to the axis of the drum screen 1, and the supporting roller 31 supports the drum screen 1.

[0045] As shown in the figure, the drum screen 1 is rotatably installed in a housing 3, and a plurality of screen holes are arranged on the drum screen 1. A supporting roller 31 is rotatably connected to each side of the housing 3 and parallel to the axis of the drum screen 1, and the supporting roller 31 supports the drum screen 1. Figure 3As shown, the driving motor 2 is arranged on the shell 3, and the output shaft of the driving motor 2 is connected with the supporting roller 31 through the synchronous belt 33. The driving motor 2 drives the synchronous belt 33 and the supporting roller 31 to rotate in turn, and the supporting roller 31 drives the drum screen 1 to rotate through friction.

[0046] As shown in Figure 2 and Figure 8 , one end of the drum screen 1 is provided with a feeding port 11, and the other end is provided with a discharging port 12. A plurality of spiral blades 13 are arranged on the inner wall of the drum screen 1. The spiral blades 13 play a guiding role for the grass leaves in the drum screen 1, which is conducive to the movement of the grass leaves from the feeding port 11 to the discharging port 12 of the drum screen 1, and realizes the screening of the grass leaves.

[0047] As shown in Figure 2 and Figure 3 , a transmission belt 4 is arranged below the drum screen 1 on the shell 3, and the conveying direction of the transmission belt 4 is parallel to the axis direction of the drum screen 1. The transmission belt 4 is driven by a conveying motor 41 arranged on the shell 3. The impurities such as silt falling from the drum screen 1 fall on the transmission belt 4, and the conveying motor 41 drives the transmission belt 4 to rotate, realizing the conveying of the impurities.

[0048] As shown in Figure 3 and Figure 9 , the shell 3 is inclinedly provided with a guide plate 32 on both sides, and the two guide plates 32 are close to each other from top to bottom, and the drum screen 1 is located between the two guide plates 32. The guide plate 32 plays a guiding role for the falling of the impurities such as silt, which is conducive to the smooth falling of the impurities on the transmission belt 4.

[0049] As shown in Figure 2 , a blower 5 is installed above the shell 3, the blower 5 is connected with a gas distribution pipe 6, the gas distribution pipe 6 is located in the shell 3 and above the drum screen 1, the gas distribution pipe 6 is arc-shaped, a plurality of air blowing pipes 61 are connected on the gas distribution pipe 6 in intervals, and the air blowing pipes 61 are parallel to the axis of the drum screen 1. Figure 7 As shown in , the lower part of the air blowing pipe 61 is provided with an air outlet, and the air outlet is inclinedly provided with a wind shield 611, which is inclined to the side close to the discharging port 12 from top to bottom. The wind shield 611 makes the blown air flow towards the material collecting side, which not only blows out the grass leaves in the screen hole, but also blows the blown grass leaves towards the side close to the discharging port 12, reducing the impact on the grass leaves entering from the feeding port 11, and also reducing the time of the grass leaves staying in the drum, which is conducive to the rapid discharging of the grass leaves, thereby reducing the risk of the grass leaves blocking the screen hole again.

[0050] Figure 2 As shown in Figure 6 , the two ends of the air blowing pipe 61 are connected with a collecting pipe 62, the collecting pipe 62 is parallel to the gas distribution pipe 6, and the collecting pipe 62 is connected with the shell 3 through a mounting seat 67.

[0051] As Figure 2 , Figure 4 and Figure 5 shown, two convergence pipes 62 are oppositely connected with a plurality of connecting pipes 63, the axis of the connecting pipes 63 is parallel to the axis of the blowing pipe 61. The upper part of the connecting pipes 63 is connected with an L-shaped air inlet pipe 64. The end of the air inlet pipe 64 is connected with a piston cylinder 7, the piston cylinder 7 is slidably connected with a piston 71 inside up and down, the lower end of the piston 71 is provided with a rounded corner, the piston cylinder 7 is slidably connected with a guide rod 72 inside up and down, the guide rod 72 is connected with the piston 71. The piston 71 is connected with a return spring 75 between the piston 71 and the piston cylinder 7.

[0052] As Figure 5 shown, the lower end of the piston 71 is connected with a connecting frame 73, the connecting frame 73 is rotatably connected with a hammering roller 74, the axis of the hammering roller 74 is parallel to the axis of the drum screen 1.

[0053] As Figure 4 and Figure 5 shown, the upper part of the air inlet pipe 64 is connected with an L-shaped air outlet pipe 65, the air inlet pipe 64 is provided with a solenoid valve 66 capable of controlling the one-way opening of the air inlet pipe 64 or the air outlet pipe 65. The valve core 661 of the solenoid valve 66 is arranged between the air inlet pipe 64 and the air outlet pipe 65, the air inlet pipe 64 is sequentially provided with the valve core 661, the connecting place of the air outlet pipe 65 and the air inlet pipe 64, the connecting place of the air inlet pipe 64 and the piston cylinder 7 along the flow direction of the airflow.

[0054] As Figure 5 shown, by switching the valve core 661, the air inlet pipe 64 is opened, the air outlet pipe 65 is closed, the piston cylinder 7 is communicated with the air inlet pipe 64, and the airflow in the air inlet pipe 64 enters the piston cylinder 7; or the air inlet pipe 64 is closed, the air outlet pipe 65 is opened, the piston cylinder 7 is communicated with the air outlet pipe 65, and the airflow in the piston cylinder 7 is released through the air outlet pipe 65.

[0055] As Figure 4 shown, the air inlet pipe 64 is provided with an air pressure sensor (not marked in the figure), the connecting frame 73 is provided with a displacement sensor (not marked in the figure), the air pressure sensor and the displacement sensor are connected with a controller (not marked in the figure) through wireless signals, and the controller is connected with the solenoid valve 66 through wireless signals.

[0056] As Figure 4 and Figure 5 shown, when the blockage of the grass leaves to the screen holes is relatively serious, and the airflow in the blowing pipe 61 cannot blow the grass leaves in the screen holes, the air pressure sensor detects that the air pressure in the air inlet pipe 64 increases, 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 communicated with the piston cylinder 7, the airflow 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.

[0057] As Figure 4 and Figure 5 shown, when the displacement sensor detects that the connecting frame 73 and the hammer roller 74 are raised to a certain extent, the controller controls the electromagnetic valve 66 to close the air inlet pipe 64 and open the air outlet pipe 65, which is in communication with the piston cylinder 7, so that the gas flow in the piston cylinder 7 is released through the air outlet pipe 65, thereby reducing the gas pressure in the piston cylinder 7, and the piston 71 and the hammer roller 74 are moved downward under the action of their own gravity and the elastic force of the return spring 75, and the hammer roller 74 hammers the drum screen 1, causing the drum screen 1 to vibrate. The hammer roller 74 is rotatably mounted on the connecting frame 73 to reduce the frictional resistance between the hammer roller 74 and the drum screen 1. The vibration of the drum screen 1 and the airflow in the air blowing pipe 61 together help to clean the grass leaves that are more seriously clogged in the screen holes, and help to improve the clogging removal effect of the screen holes.

[0058] As Figure 2 shown, a reinforcing rod 76 is connected between the two adjacent piston cylinders 7. The reinforcing rod 76 helps to increase the stability between the two piston cylinders 7.

[0059] As Figure 2 shown, a negative pressure chamber 8 is rotatably connected to one end of the drum screen 1 near the discharge port 12, and a conical filter cover 87 is arranged in the negative pressure chamber 8, with its axis parallel to the axis of the drum screen 1. The filter cover 87 is connected to the drum screen 1 by a connecting rod 88, and the filter cover 87 is provided with filter holes. A negative pressure fan 84 is arranged on the negative pressure chamber 8. The side edge of the filter cover 87 gradually approaches the axis of the filter cover 87 from the end far from the negative pressure fan 84 to the end close to the negative pressure fan 84.

[0060] As Figure 2 shown, the negative pressure fan 84 draws air from the negative pressure chamber 8 and the drum screen 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 screen 1, thereby reducing the clogging of the screen holes by grass leaves and improving the screening efficiency.

[0061] As Figure 2 shown, the lower end of the negative pressure chamber 8 is provided with a discharge hopper 83, which 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 raised mud and grass leaves, and the grass leaves fall from the discharge hopper 83, and the mud passes through the filter cover 87 and is collected in the filter bag 85.

[0062] As Figure 2 shown, a baffle 86 is horizontally arranged between the end close to the negative pressure fan 84 and the filter cover 87 in the negative pressure chamber 8, and 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, and the negative pressure fan 84 is in communication with the upper chamber 81.

[0063] As Figure 2 Figure 2 shown, under the action of negative pressure fan 84, upper chamber 81 is a negative pressure area, the negative pressure airflow in upper chamber 81 and the airflow blown out by air outlet pipe 65 cooperate, which is conducive to moving the grass leaves in drum screen 1 to one end of discharge port 12 quickly, thereby facilitating the rapid screening of the grass leaves and reducing the risk of screen hole clogging of the grass leaves. Discharge hopper 83 is arranged at the lower part of lower chamber 82, and the air pressure in lower chamber 82 is smaller, which is conducive to the grass leaves moving to filter cover 87 falling into discharge hopper 83 along the slope of filter cover 87, thereby facilitating the falling of the grass leaves.

[0064] The implementation principle of the drum screening device for grass leaves in the embodiment is as follows:

[0065] Drive motor 2 drives synchronous belt 33, support roller 31 and drum screen 1 to rotate in sequence, conveying motor 41 drives transmission belt 4 to rotate, and the grass leaves to be screened are poured into drum screen 1 from feeding port 11, and the grass leaves are moved from one end of feeding port 11 to one end of discharge port 12 under the driving of helical blade 13.

[0066] The airflow blown out by air blower 5 reaches air blowing pipe 61 through air distribution pipe 6, and the air baffle 611 at the air outlet of air blowing pipe 61 makes the blown air flow towards the material collection side, which can clear the grass leaves in the screen holes and blow the cleared grass leaves to move towards the side close to discharge port 12.

[0067] The airflow in air blowing pipe 61 reaches air inlet pipe 64 in sequence through collection pipe 62 and connecting pipe 63, when the clogging of the screen holes by the grass leaves is relatively serious, and the airflow in air blowing pipe 61 cannot blow the grass leaves in the screen holes, the air pressure sensor detects that the air pressure in air inlet pipe 64 increases, the controller controls electromagnetic valve 66 to close air outlet pipe 65 and open air inlet pipe 64, so that air inlet pipe 64 is communicated with piston cylinder 7, the airflow in air inlet pipe 64 pushes piston 71 and drives hammering roller 74 to move upwards, and compression spring 75 is compressed.

[0068] When displacement sensor detects that connecting frame 73 and hammering roller 74 move to a certain extent, the controller controls electromagnetic valve 66 to close air inlet pipe 64 and open air outlet pipe 65, so that air outlet pipe 65 is communicated with piston cylinder 7, and the airflow in piston cylinder 7 is released through air outlet pipe 65, so that the air pressure in piston cylinder 7 decreases, and piston 71 and hammering roller 74 move downwards under the action of their own gravity and the elastic force of compression spring 75, and hammering roller 74 hammers drum screen 1, so that drum screen 1 vibrates. Under the joint action of the vibration of drum screen 1 and the airflow in air blowing pipe 61, the grass leaves clogging the screen holes can be cleared, which helps to improve the screen hole cleaning effect.

[0069] The negative pressure fan 84 draws air from the negative pressure cavity 8 and the drum screen 1, and cooperates with the air flow blown by the air outlet pipe 65, which is beneficial to the rapid collection of the grass leaves in the drum screen 1. The filtering cover 87 filters the raised silt and grass leaves, and the grass leaves fall from the discharge hopper 83, and the silt passes through the filtering cover 87 and is collected in the filter bag 85.

[0070] In addition, it also needs to be explained that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements.

Claims

1. A drum screening device for grass blades, comprising a drum screen and a drive motor for rotating the drum screen, wherein one end of the drum screen is provided with a feed inlet and the other end with a discharge outlet, characterized in that: The drum screen is provided with a plurality of air blowing pipes above the drum screen, the air blowing pipes are connected with air blowers, and the air outlets of the air blowing pipes are provided with wind baffles which are inclined from top to bottom to the side close to the discharge port. The air blowing pipe is connected with an air inlet pipe, the end of the air inlet pipe is connected with a piston cylinder, the piston cylinder is slidably connected with a piston, the lower end of the piston is provided with a round corner, the piston cylinder is connected with a return spring, the lower part of the piston is connected with a hammer roller which can abut against the drum screen, the air inlet pipe is connected with an air outlet pipe, and the air inlet pipe is provided with a solenoid valve which can control the one-way opening of the air inlet pipe or the air outlet pipe; the plurality of air blowing pipes are communicated with a distribution pipe, the air blower is connected with the distribution pipe; the two ends of the air blowing pipe are connected with a collecting pipe, the collecting pipe is connected with the air inlet pipe, and the adjacent two piston cylinders are connected with a reinforcing rod; the air flow in the air blowing pipe reaches the air inlet pipe through the collecting pipe, when the blockage of the screen holes by the grass leaves is relatively serious, the air flow in the air blowing pipe cannot blow the grass leaves in the screen holes, the air pressure in the air inlet pipe increases, the control solenoid valve closes the air outlet pipe and opens the air inlet pipe, the air inlet pipe is communicated with the piston cylinder, the air flow in the air inlet pipe drives the piston and the hammer roller to move upwards, and the return spring is compressed; when the hammer roller moves upwards to a certain extent, the control solenoid valve closes the air inlet pipe and opens the air outlet pipe, the air outlet pipe is communicated with the piston cylinder, the air flow in the piston cylinder is released through the air outlet pipe, so that the air pressure in the piston cylinder decreases, the hammer roller moves downwards under the action of its own gravity and the elastic force of the return spring, hammers the drum screen, and the drum screen vibrates.

2. A drum screening device for grass leaves according to claim 1, characterized in that: The drum screen is provided with a negative pressure cavity which is rotatably connected to one end of the drum screen close to the discharge port, the negative pressure cavity is provided with a conical filter cover, the filter cover is connected to the drum screen through a connecting rod, and the negative pressure cavity is provided with a negative pressure fan.

3. A drum screening apparatus for grass leaves according to claim 2, characterized in that: The lower end of the negative pressure cavity is provided with a discharge hopper, and the air outlet end of the negative pressure fan is connected with a filter bag.

4. A drum screening apparatus for grass leaves according to claim 3, characterized in that: The negative pressure cavity is provided with a baffle between one end close to the negative pressure fan and the filter cover, the baffle and the filter cover are rotatably connected, the baffle divides the negative pressure cavity into an upper chamber and a lower chamber, and the negative pressure fan is communicated with the upper chamber.

5. The drum screening apparatus for grass leaves according to claim 1, characterized in that: The inner wall of the drum screen is provided with a plurality of spiral blades.

6. A drum screening apparatus for grass leaves according to claim 5, characterized in that: The drum screen is provided with a shell, the air blower is arranged above the shell, and the collecting pipe is connected to the shell through a mounting seat.

7. A drum screening apparatus for grass leaves according to claim 6, characterized in that: The shell is rotatably connected with supporting rollers on both sides of the drum screen, a driving motor is arranged on the shell, and the output shaft of the driving motor is connected with the supporting rollers through a synchronous belt.

8. A drum screening apparatus for grass leaves according to claim 7, characterized in that: The shell is provided with a transmission belt below the drum screen, and the transmission belt is driven by a conveying motor arranged on the shell.

9. A drum screening apparatus for grass leaves according to claim 8, characterized in that: Both sides of the shell are provided with guide plates which are inclined and close to each other from top to bottom.

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