Dynamic dredging ejector rod same-direction moving type traditional Chinese medicine sieving machine
Technical Field
The invention belongs to the technical field of production of traditional Chinese medicine preparations, and particularly relates to a dynamic dredging ejector rod equidirectional movable traditional Chinese medicine screening machine.
Background
In the production process of traditional Chinese medicine, the sliced traditional Chinese medicine decoction pieces are sometimes required to be screened, and the traditional Chinese medicine decoction pieces with granularity which does not meet the requirement are screened out and then subjected to secondary crushing treatment so as to enable the sizes of the traditional Chinese medicine decoction pieces to meet the requirement. The traditional Chinese medicine screening is finished by manually screening through a sieve, and is changed into screening through a drum sieve, but the traditional drum sieve needs to manually dredge sieve pores after blockage is generated in the traditional Chinese medicine screening process, so that inconvenience is caused when the sieve pores are dredged.
Disclosure of Invention
The invention provides a dynamic dredging ejector rod equidirectional mobile traditional Chinese medicine screening machine which can be dredged without stopping a screen, and solves the problem of labor waste in manual dredging of a drum screen in the production process of traditional Chinese medicines.
The technical problem is solved by the following technical scheme: a dynamic dredging ejector rod co-directional moving type traditional Chinese medicine screening machine is characterized by comprising a rack, a barrel, a first dredging mechanism and a second dredging mechanism, wherein a driving rotating shaft which is obliquely arranged is rotatably connected to the rack, the barrel is coaxially sleeved on the driving rotating shaft and is fixed together with the driving rotating shaft, the barrel is in a regular prism shape, the lower end of the barrel is open, and each side surface of the barrel is provided with a plurality of sieve holes; the first dredging mechanism comprises a first dredging mechanism part base plate positioned outside the cylinder, first dredging mechanism part dredging rods arranged on the first dredging mechanism part base plate and capable of being inserted into the sieve holes on the same side face of the cylinder in a one-to-one correspondence mode, a first dredging mechanism part base plate telescoping mechanism for driving the first dredging mechanism part base plate to be separated and combined relative to the cylinder so that the first dredging mechanism part dredging rods are pulled out and inserted into the sieve holes, and a first dredging mechanism part base plate swinging mechanism for driving the first dredging mechanism part base plate to swing around the rotating shaft; the second dredging mechanism comprises a second dredging mechanism part base plate positioned outside the side face of the cylinder, second dredging mechanism part dredging rods which are arranged on the second dredging mechanism part base plate and can be inserted into the sieve holes on the same side face of the cylinder in a one-to-one correspondence manner, a second dredging mechanism part base plate telescoping mechanism for driving the second dredging mechanism part base plate to be separated and combined relative to the cylinder so that the second dredging mechanism part dredging rods are pulled out and inserted into the sieve holes, and a second dredging mechanism part base plate swinging mechanism for driving the second dredging mechanism part base plate to swing around the rotating shaft; when the first dredging mechanism part telescopic mechanism is in an extension state and the second dredging mechanism part telescopic mechanism is in a contraction state, the second dredging mechanism part base plate can pass through the lower part of the first dredging mechanism part base plate; when the second dredging mechanism part telescopic mechanism is in an extension state and the first dredging mechanism part telescopic mechanism is in a contraction state, the first dredging mechanism part base plate can pass through the lower part of the second dredging mechanism part base plate; the starting position of the swing stroke of the first dredging mechanism base plate is the same as the starting position of the swing stroke of the second dredging mechanism base plate. When the sieve is used, the traditional Chinese medicine decoction pieces are poured into the barrel from the high end of the barrel, the barrel rotates under the driving of the driving rotating shaft, the traditional Chinese medicine decoction pieces move towards the low end of the barrel while rotating along with the barrel in the barrel, the traditional Chinese medicine decoction pieces are sieved in the process, the thick traditional Chinese medicine decoction pieces fall out from the low end of the barrel, and the thin traditional Chinese medicine decoction pieces fall out from the sieve pores. The first mediation mechanism of barrel continuous rotation's process and second mediation mechanism still dredge the sieve mesh, and the process of specifically being dredged is: when the screen holes on one side of the cylinder rotate to be aligned with the first dredging mechanism part dredging rods of the first dredging mechanism part base plate positioned at the starting point position of the swing stroke and the starting point position of the telescopic stroke one by one, the first dredging mechanism conducts dredging operation on the screen holes on one side of the cylinder, the cylinder continues to rotate in the dredging process, the second dredging mechanism part base plate resets to the starting point position of the swing stroke and the starting point position of the telescopic stroke before the cylinder continues to rotate by 360/n degrees, when the cylinder continues to rotate by 360/n degrees, the screen holes on the next side of the cylinder are aligned with the second dredging mechanism part dredging rods of the second dredging mechanism part base plate positioned at the starting point position of the swing stroke and the starting point position of the telescopic stroke one by one, the second dredging mechanism conducts dredging operation on the screen holes on the next side of the cylinder, and the first dredging mechanism part base plate resets to the starting point position of the swing stroke before the cylinder continues to rotate by 2/n degrees When the angle of continuous rotation of the cylinder body reaches 2 x 360/n degrees, sieve pores on the next side face are aligned with the first dredging mechanism part dredging rods of the first dredging mechanism part base plate positioned at the swing stroke starting position and the telescopic stroke starting position one by one, the first dredging mechanism conducts dredging operation on the sieve pores on the next side face of the cylinder body, and the like, so that the sieve pores on all the side faces of the cylinder body are dredged in sequence, and n is the number of the side faces of the cylinder body; the specific processes that the first dredging mechanism conducts dredging and the base plate of the first dredging mechanism part is reset to the starting point position of the swing stroke and the starting point position of the telescopic stroke are as follows: the first dredging mechanism base plate swinging mechanism drives the first dredging mechanism base plate to swing forwards to the swinging stroke end position of the first dredging mechanism base plate in a mode that the swinging direction is the same as the rotating direction of the cylinder body and the swinging angular speed is the same as the rotating angular speed of the cylinder body, in the process that the first dredging mechanism base plate swings forwards, the first dredging mechanism base plate telescoping mechanism firstly drives the first dredging mechanism base plate to retract to the end position of the telescopic stroke so that the first dredging mechanism base plate is inserted into the sieve mesh, then drives the first dredging mechanism base plate to extend to the starting position of the telescopic stroke so that the first dredging mechanism base plate is pulled out of the sieve mesh, and after the first dredging mechanism base plate is positioned at the starting position of the telescopic stroke, the first dredging mechanism base plate swinging mechanism drives the first dredging mechanism base plate to swing backwards to the starting position of the swinging stroke; the specific processes of dredging by the second dredging mechanism and resetting the base plate of the second dredging mechanism part to the starting position of the swing stroke and the starting position of the telescopic stroke are as follows: the second dredging mechanism base plate swinging mechanism drives the second dredging mechanism base plate to swing to the swinging stroke end position of the second dredging mechanism base plate in the positive direction in a mode that the swinging direction is the same as the rotating direction of the cylinder body and the swinging angular speed is the same as the rotating angular speed of the cylinder body, the second dredging mechanism base plate is used for driving the second dredging mechanism base plate to firstly contract to a telescopic stroke end position by the second dredging mechanism base plate telescopic mechanism in the forward swinging process so that the second dredging mechanism base plate is inserted into the sieve mesh, then the second dredging mechanism base plate is driven to extend to a telescopic stroke starting point position so that the second dredging mechanism base plate is pulled out from the sieve mesh, and the second dredging mechanism base plate swinging mechanism drives the second dredging mechanism base plate to reversely swing to a swinging stroke starting point position after the second dredging mechanism base plate is located at the telescopic stroke starting point position. The invention realizes the dredging of the sieve pores in the sieving process, and the barrel does not need to stop rotating when the sieve pores are dredged.
Preferably, the first dredging mechanism part substrate swinging mechanism is positioned at one end of the cylinder body, the first dredging mechanism part substrate swinging mechanism comprises a first dredging mechanism part swinging shaft coaxial with the driving rotating shaft, a first dredging mechanism part motor driving the first dredging mechanism part swinging shaft to rotate and a first dredging mechanism part clutch enabling the first dredging mechanism part swinging shaft to be connected with the driving rotating shaft, and the first dredging mechanism part substrate stretching and retracting mechanism connects the first dredging mechanism part substrate with the first dredging mechanism part swinging shaft; second mediation mechanism portion base plate swing mechanism is located the other end of barrel, second mediation mechanism portion base plate swing mechanism include with coaxial second mediation mechanism portion balance staff of drive pivot, drive second mediation mechanism portion balance staff pivoted second mediation mechanism portion motor and make second mediation mechanism portion balance staff link together with the drive pivot second mediation mechanism portion clutch, second mediation mechanism portion stretch out base plate shrink mechanism will second mediation mechanism portion base plate with second mediation mechanism portion balance staff links together. The structure is compact, and the two first dredging mechanisms and the second dredging mechanism are conveniently not interfered.
The invention also comprises a cylinder rotating motor for driving the driving rotating shaft to rotate, one end of the rotating shaft of the cylinder rotating motor is coaxially connected with the driving rotating shaft, and the other end of the rotating shaft of the cylinder rotating motor is connected with the first dredging mechanism part swinging shaft through the first dredging mechanism part clutch or connected with the second dredging mechanism part swinging shaft through the second dredging mechanism part clutch. Further improving the structural compactness.
Preferably, one end, far away from the first dredging mechanism part base plate, of the first dredging mechanism part dredging rod is provided with a rubber sheet which can be pushed into the sieve hole by the first dredging mechanism part dredging rod when the rubber sheet is wrapped on the first dredging mechanism part dredging rod in an elastic deformation mode, and the area of the rubber sheet is more than 1.3 times of the opening area of the sieve hole. When the outer ends of the herbal pieces clamped in the sieve holes extend out of the barrel body and are in an inclined state (namely, the projections of the outer ends of the herbal pieces clamped in the sieve holes in the opening direction of the sieve holes are positioned outside the sieve holes), the first dredging mechanism can reliably push the herbal pieces into the barrel body. The rubber sheet is automatically unfolded when being pulled out of the sieve pores, and is extruded and folded onto the dredging rod of the first dredging mechanism part when being inserted.
Preferably, the sieve mesh is a circular hole, the rubber sheet is circular, the rubber sheet is coaxial with the first dredging mechanism part dredging rod, and the diameter of the rubber sheet is more than 1.3 times of that of the sieve mesh. The manufacture and the positioning are convenient.
Preferably, one end of the second dredging mechanism part dredging rod, which is far away from the second dredging mechanism part base plate, is provided with a rubber sheet which can be pushed into the sieve hole by the second dredging mechanism part dredging rod when the rubber sheet is wrapped on the second dredging mechanism part dredging rod in an elastic deformation mode, and the area of the rubber sheet is more than 1.3 times of the opening area of the sieve hole. When the outer ends of the herbal pieces clamped in the sieve holes extend out of the barrel body and are in an inclined state (namely, the projections of the outer ends of the herbal pieces clamped in the sieve holes in the opening direction of the sieve holes are positioned outside the sieve holes), the second dredging mechanism can reliably push the herbal pieces into the barrel body. The rubber sheet is automatically unfolded when being pulled out of the sieve pores, and is extruded and folded onto the dredging rod of the second dredging mechanism part when being inserted.
Preferably, the sieve mesh is a circular hole, the rubber sheet is circular, the rubber sheet is coaxial with the second dredging mechanism part dredging rod, and the diameter of the rubber sheet is more than 1.3 times of that of the sieve mesh. The manufacture and the positioning are convenient.
Preferably, the high end of the cylinder is provided with an inner retainer ring extending along the circumferential direction of the cylinder, and the rack is provided with a feeding hopper with an outlet end extending into the high end of the cylinder. Can prevent the Chinese herbal pieces from falling out from the high end of the barrel when the Chinese herbal pieces are poured into the barrel.
Preferably, the rack is provided with a coarse medicine feeding hopper for receiving the coarse Chinese medicines falling from the lower end of the barrel and a fine medicine feeding hopper for receiving the coarse Chinese medicines falling through the sieve pores of the barrel.
The invention has the following beneficial effects: the sieve mesh can be dredged in the process of sieving the Chinese herbal pieces, so that the phenomenon of blockage caused by penetration can be avoided.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a large cross-sectional schematic view of the present invention with a first dredge mechanism base plate at an oscillation stroke start position and a second dredge mechanism base plate at an oscillation stroke start position and a contraction stroke start position;
FIG. 3 is an enlarged partial schematic view at A of FIG. 2;
FIG. 4 is a large cross-sectional view of the present invention when the second dredge mechanism base plate is at the swing stroke start position and the first dredge mechanism base plate is at the contraction stroke end position;
fig. 5 is a partially enlarged schematic view at B of fig. 4;
fig. 6 is a schematic cross-sectional view of the present invention when the second dredge mechanism base plate is at the swing stroke start position and the first dredge mechanism base plate is at the swing stroke end position.
FIG. 7 is a large cross-sectional view of the present invention when the second dredge mechanism base plate is at the end position of the contraction stroke and the first dredge mechanism base plate is at the start position of the contraction stroke;
fig. 8 is a schematic cross-sectional view of the present invention when the second dredge mechanism base plate is at the swing stroke end position and the first dredge mechanism base plate is at the swing stroke start position.
In the figure: the device comprises a frame 1, a cylinder 2, a driving rotating shaft 3, a connecting strip 4, a sieve pore 5, an inner retainer ring 6, a feeding hopper 7, a coarse medicine discharging hopper 8, a fine medicine discharging hopper 9, a cylinder rotating motor 10, a first dredging mechanism part base plate 11, a first dredging mechanism part dredging rod 12, a first dredging mechanism part base plate telescoping mechanism 18, a first dredging mechanism part base plate swinging mechanism 13, a rubber sheet 14, a first dredging mechanism part swinging shaft 15, a first dredging mechanism part motor 16, a first dredging mechanism part clutch 17, a second dredging mechanism part base plate 21, a second dredging mechanism part dredging rod 22, a second dredging mechanism part base plate telescoping mechanism 28, a second dredging mechanism part base plate swinging mechanism 23, a second dredging mechanism part swinging shaft 25, a second dredging mechanism part motor 26 and a second dredging mechanism part clutch 27.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
Referring to fig. 1 to 8, a dynamic dredging push rod equidirectional movable traditional Chinese medicine sieving machine comprises a frame 1, a cylinder 2, a first dredging mechanism and a second dredging mechanism. The frame is rotatably connected with a driving rotating shaft 3 which is obliquely arranged. The cylinder 2 is in a regular 8 prism shape, and two end ends of the cylinder are opened. The cylinder body is coaxially sleeved on the driving rotating shaft and is connected to the driving rotating shaft through a plurality of connecting strips 4. Each side of the cylinder is provided with a plurality of sieve holes 5. The sieve pores are round holes. The high end of the cylinder body is provided with an inner retainer ring 6 extending along the circumferential direction of the cylinder body. The frame is provided with a feeding hopper 7 with an outlet end extending into the high end of the cylinder. The frame is provided with a coarse medicine feeding hopper 8 for receiving the coarse traditional Chinese medicine at the lower end of the barrel body and a fine medicine feeding hopper 9 for receiving the coarse traditional Chinese medicine through the sieve pores of the barrel body. The present invention further includes a drum rotating motor 10 for driving the rotation of the driving shaft. One end of the rotating shaft of the cylinder rotating motor is coaxially connected with the high end of the driving rotating shaft.
The first dredging mechanism comprises a first dredging mechanism base plate 11 positioned outside the cylinder, first dredging mechanism base plate dredging rods 12 arranged on the first dredging mechanism base plate and capable of being inserted into the sieve holes in the same side face of the cylinder in a one-to-one correspondence mode, a first dredging mechanism base plate telescoping mechanism 18 for driving the first dredging mechanism base plate to be separated and combined relative to the cylinder and enabling the first dredging mechanism base plate to be pulled out and inserted into the sieve holes, and a first dredging mechanism base plate swinging mechanism 13 for driving the first dredging mechanism base plate to swing by taking the rotating shaft as a swing mode. One end of the first dredging mechanism part dredging rod, which is far away from the first dredging mechanism part base plate, is provided with a rubber sheet 14. The sheet rubber is circular, and the sheet rubber is coaxial with first mediation mechanism portion dredge pole, and the diameter of sheet rubber is more than 1.3 times of the diameter of sieve mesh. When the dredging rod of the first dredging mechanism part is inserted into the sieve hole, the rubber sheet is wrapped on the dredging rod of the first dredging mechanism part in an elastic deformation mode and is inserted into the sieve hole together to fill the sieve hole.
The first dredging mechanism part base plate swinging mechanism is positioned at the lower end of the cylinder body. The first dredging mechanism substrate swing mechanism comprises a first dredging mechanism swing shaft 15 which is coaxial with the driving rotating shaft, a first dredging mechanism motor 16 which drives the first dredging mechanism swing shaft to rotate and a first dredging mechanism clutch 17 which enables the first dredging mechanism swing shaft to be connected with the driving rotating shaft. The first dredging mechanism part substrate extending and retracting mechanism is an air cylinder. The first dredging mechanism substrate stretching and retracting mechanism connects the first dredging mechanism substrate with the first dredging mechanism swing shaft. The first dredging mechanism motor is fixed on the frame. The first dredging mechanism part motor is a stepping motor. When the first dredging mechanism extending base plate swings from the swing starting position to the swing end position, namely swings in the same direction as the rotation direction of the cylinder (namely the forward swing in the invention), the motor of the first dredging mechanism stops and the clutch of the first dredging mechanism is closed, so that the cylinder rotates the motor to drive the rotating shaft and simultaneously drives the swing shaft of the first dredging mechanism, and the rotation angular speed of the cylinder is conveniently ensured to be equal to the swing angular speed of the first dredging mechanism extending base plate. When the first dredging mechanism extending base plate swings from the swing end position to the swing start position (i.e., the reverse swing in the present invention), the first dredging mechanism clutch is disengaged, and the first dredging mechanism motor rotates to drive the first dredging mechanism swinging shaft to rotate so as to make the first dredging mechanism base plate swing in the reverse direction.
The second dredging mechanism comprises a second dredging mechanism base plate 21 positioned outside the cylinder, second dredging mechanism part dredging rods 22 arranged on the second dredging mechanism part base plate and capable of being inserted into the sieve holes in the same side face of the cylinder in a one-to-one correspondence mode, a second dredging mechanism part base plate stretching mechanism 28 for driving the second dredging mechanism part base plate to be separated and combined relative to the cylinder and enabling the second dredging mechanism part dredging rods to be pulled out and inserted into the sieve holes, and a second dredging mechanism part base plate swinging mechanism 23 for driving the second dredging mechanism part base plate to swing by taking the rotating shaft as a swing mode. One end of the second dredging mechanism part dredging rod, which is far away from the second dredging mechanism part base plate, is also provided with a rubber sheet. The rubber piece is circular, and the rubber piece is coaxial with second mediation mechanism portion dredge pole, and the diameter of rubber piece is more than the multiple of the diameter of sieve mesh. When the dredging rod of the second dredging mechanism part is inserted into the sieve hole, the rubber sheet is wrapped on the dredging rod of the second dredging mechanism part in an elastic deformation mode and is inserted into the sieve hole together to fill the sieve hole.
The second dredging mechanism part substrate swing mechanism is positioned at the high end of the cylinder. The second dredging mechanism part substrate swing mechanism comprises a second dredging mechanism part swing shaft 25 which is coaxial with the driving rotating shaft, a second dredging mechanism part motor 26 which drives the second dredging mechanism part swing shaft to rotate and a second dredging mechanism part clutch 27 which enables the second dredging mechanism part swing shaft to be connected with the lower end of the driving rotating shaft, and the second dredging mechanism part clutch is specifically connected with the other end of the rotating shaft of the cylinder rotating motor to realize connection with the driving rotating shaft. The substrate extending and contracting mechanism of the second dredging mechanism part is an air cylinder. The second dredging mechanism substrate stretching and retracting mechanism connects the second dredging mechanism substrate with the second dredging mechanism swing shaft. The second dredging mechanism motor is fixed on the frame. The motor of the second dredging mechanism part is a stepping motor. When the second dredging mechanism extending base plate swings from the swing starting position to the swing end position, namely swings in the same direction as the rotation direction of the cylinder (namely the forward swing in the invention), the motor of the second dredging mechanism stops and the clutch of the second dredging mechanism is closed, so that the cylinder rotates the motor to drive the rotating shaft and simultaneously drives the swing shaft of the second dredging mechanism, and the rotation angular speed of the cylinder is conveniently ensured to be equal to the swing angular speed of the second dredging mechanism extending base plate. When the second dredging mechanism extending base plate swings from the swing end position to the swing start position (i.e. the reverse swing in the invention), the clutch of the second dredging mechanism is disengaged, and the second dredging mechanism motor rotates to drive the second dredging mechanism swinging shaft to rotate so as to make the second dredging mechanism base plate swing reversely.
When the first dredging mechanism part telescopic mechanism is in an extension state and the second dredging mechanism part telescopic mechanism is in a contraction state, the second dredging mechanism part base plate can pass through the lower part of the first dredging mechanism part base plate; when the second dredging mechanism part telescopic mechanism is in an extension state and the first dredging mechanism part telescopic mechanism is in a contraction state, the first dredging mechanism part base plate can pass through the lower part of the second dredging mechanism part base plate; the starting position of the swing stroke of the first dredging mechanism base plate is the same as the starting position of the swing stroke of the second dredging mechanism base plate.
When the feeding device is used, the traditional Chinese medicine decoction pieces are poured into the barrel from the high end of the barrel through the feeding hopper, the barrel continuously rotates under the driving of the barrel driving motor, the traditional Chinese medicine decoction pieces move towards the low end of the barrel while rotating along with the barrel in the barrel, the traditional Chinese medicine decoction pieces are screened in the process, the thick traditional Chinese medicine decoction pieces fall out from the low end of the barrel to the thick medicine feeding hopper to flow out, and the thin traditional Chinese medicine decoction pieces fall out from the screen holes to the thin medicine feeding hopper to flow out. The first mediation mechanism of barrel continuous rotation's process and second mediation mechanism still dredge the sieve mesh, and the process of specifically being dredged is:
when the cylinder rotates (the rotation direction of the cylinder is clockwise in figure 2), the first dredging mechanism conducts dredging operation on the sieve pores on one side surface when the sieve pores on one side surface are aligned with the dredging rods of the first dredging mechanism part base plate positioned at the starting point position of the swing stroke and the starting point position of the telescopic stroke one by one, the cylinder continues to rotate in the dredging process, the base plate of the second dredging mechanism part resets to the starting point position of the swing stroke and the starting point position of the telescopic stroke before the continuous rotation angle of the cylinder reaches 360/n degrees, when the continuous rotation angle of the cylinder reaches 360/n degrees, the sieve pores on the next side surface are aligned with the dredging rods of the second dredging mechanism part base plate positioned at the starting point position of the swing stroke and the starting point position of the telescopic stroke one by one, and the second dredging mechanism conducts dredging operation on the sieve pores on the next side surface of the cylinder, the first dredging mechanism base plate resets to the swing stroke starting position and the telescopic stroke starting position before the angle of continuous rotation of the cylinder body reaches 2 x 360/n degrees, when the angle of continuous rotation of the cylinder body reaches 2 x 360/n degrees, the sieve holes on the next side face are aligned with the first dredging mechanism part dredging rods of the first dredging mechanism base plate on the swing stroke starting position and the telescopic stroke starting position one by one, the first dredging mechanisms dredge the sieve holes on the next side face of the cylinder body, n is the number of the side faces of the cylinder body, and n is 8 in the embodiment; the specific processes that the first dredging mechanism conducts dredging and the base plate of the first dredging mechanism part is reset to the starting point position of the swing stroke and the starting point position of the telescopic stroke are as follows: the first dredging mechanism base plate swinging mechanism drives the first dredging mechanism base plate to swing forwards to the swinging stroke end position of the first dredging mechanism base plate in a mode that the swinging direction is the same as the rotating direction of the cylinder body and the swinging angular speed is the same as the rotating angular speed of the cylinder body, in the process that the first dredging mechanism base plate swings forwards, the first dredging mechanism base plate telescoping mechanism firstly drives the first dredging mechanism base plate to retract to the end position of the telescopic stroke so that the first dredging mechanism base plate is inserted into the sieve mesh, then drives the first dredging mechanism base plate to extend to the starting position of the telescopic stroke so that the first dredging mechanism base plate is pulled out of the sieve mesh, and after the first dredging mechanism base plate is positioned at the starting position of the telescopic stroke, the first dredging mechanism base plate swinging mechanism drives the first dredging mechanism base plate to swing backwards to the starting position of the swinging stroke; the specific processes of dredging by the second dredging mechanism and resetting the base plate of the second dredging mechanism part to the starting position of the swing stroke and the starting position of the telescopic stroke are as follows: the second dredging mechanism base plate swinging mechanism drives the second dredging mechanism base plate to swing to the swinging stroke end position of the second dredging mechanism base plate in the positive direction in a mode that the swinging direction is the same as the rotating direction of the cylinder body and the swinging angular speed is the same as the rotating angular speed of the cylinder body, the second dredging mechanism base plate is used for driving the second dredging mechanism base plate to firstly contract to a telescopic stroke end position by the second dredging mechanism base plate telescopic mechanism in the forward swinging process so that the second dredging mechanism base plate is inserted into the sieve mesh, then the second dredging mechanism base plate is driven to extend to a telescopic stroke starting point position so that the second dredging mechanism base plate is pulled out from the sieve mesh, and the second dredging mechanism base plate swinging mechanism drives the second dredging mechanism base plate to reversely swing to a swinging stroke starting point position after the second dredging mechanism base plate is located at the telescopic stroke starting point position.