Rotary screening machine for rough and fine tuber fleeceflower stems

Abstract

The utility model relates to the technical field of medicinal material processing, and discloses a multiflower knotweed vine thickness rotary screening machine which comprises a first seat body, a second seat body rotationally connected to the first seat body, a screening box fixed to the second seat body and a power assembly capable of driving the second seat body to do eccentric rotary motion on a horizontal plane. A first screen and a second screen are arranged in the screen box in an up-down spaced mode, screen holes of the first screen are larger than those of the second screen, the screen box is provided with a first discharging groove corresponding to the first screen, a second discharging groove corresponding to the second screen and a material residue discharging port located in the lower end of the screen box, and walking wheels are arranged on the two opposite sides of the first base body. And a connecting mechanism capable of enabling the walking wheels to support one part of the first seat body on the ground is arranged between the two walking wheels. The utility model has the following advantages and effects: during working, the first seat body is in contact with the ground, so that the stability is better; and a worker cooperates with the connecting mechanism to enable the walking wheels to support one part of the first seat body, so that the worker can conveniently move the screening machine.

Description

Technical Field

[0001] The utility model relates to the technical field of medicinal material processing, in particular to a coarse and fine rotary screening machine for Polygonum multiflorum vine. Background Art

[0002] Polygonum multiflorum is a Chinese herbal medicine that can detoxify, help the body moisturize the intestines and promote bowel movements, has a good calming effect, can help the body get rid of rheumatism, and also has antipruritic effects. Polygonum multiflorum is harvested in autumn and winter, the remaining leaves are removed, tied into bundles or cut into sections while fresh, and dried for use as medicine. The thickness of the cut Polygonum multiflorum is inconsistent and needs to be screened. The existing equipment has good stability when in use, but it is troublesome to move when not in use. Some are easy to move but have poor stability when in use, and none of them are ideal. Utility Model Content

[0003] The utility model aims to provide a coarse and fine rotary screening machine for Polygonum multiflorum vines, which has the advantages of good stability and easy movement during use.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A coarse and fine rotary screening machine for Polygonum multiflorum vines comprises a first base body, a second base body rotatably connected to the first base body, a screen box fixed to the second base body, and a power assembly capable of driving the second base body to perform eccentric rotational motion on a horizontal plane, wherein a first screen and a second screen are installed in the screen box at an interval up and down, the screen holes of the first screen are larger than the screen holes of the second screen, the screen box is provided with a first discharge trough corresponding to the first screen, a second discharge trough corresponding to the second screen, and a slag discharge port located at the lower end of the screen box, running wheels are provided on opposite sides of the first base body, a connecting mechanism is provided between the two running wheels, and the connecting mechanism enables the running wheels to support a part of the first base body on the ground.

[0006] By adopting the above technical scheme, the cut Polygonum multiflorum vine is poured onto the first sieve, and the power component drives the second seat body and the screen box to rotate eccentrically on the horizontal plane, and the Polygonum multiflorum vine shakes on the first sieve. The Polygonum multiflorum vine with a diameter smaller than the sieve hole on the first sieve will pass through the sieve hole and fall onto the second sieve, and the Polygonum multiflorum vine with a large diameter is retained on the first sieve. The Polygonum multiflorum vine retained on the first sieve is discharged from the first discharge chute and reaches the Polygonum multiflorum vine on the second sieve, and the Polygonum multiflorum vine with a large diameter is retained on the second sieve. The residue with a small diameter will pass through the sieve hole of the second sieve and be discharged from the residue discharge port, and the Polygonum multiflorum vine retained on the second sieve can be discharged from the second discharge chute, thereby completing the coarse and fine screening of the Polygonum multiflorum vine. In this process, the first seat body is in contact with the ground, so that the screening machine has better stability during operation; when the screening machine needs to be moved after work, the connecting mechanism can enable the walking wheels to support a part of the first seat body with the cooperation of the staff, so that the staff can use the walking wheels to completely lift the first seat body off the ground and move the screening machine.

[0007] The utility model is further configured as follows: the power assembly includes a power piece, a first pulley, a second pulley and a belt mounted on the first pulley and the second pulley, the power piece is a motor, the shell of the power piece is fixed on the first base body, the first pulley is fixed on the output shaft of the power piece, a vertical rotating shaft is provided on the first base body, the output shaft of the power piece is parallel to the rotating shaft, the second pulley is fixed to one end of the rotating shaft, a horizontal rotating disk is provided between the first base body and the second base body and between the other end of the rotating shaft and the second base body. The middle part of the lower end of the rotating disk has an axis portion and the upper end has an eccentric portion near the edge, the first base body is rotatably connected to the axis portion of the corresponding rotating disk, the second base body is fixed to the eccentric portion of the corresponding rotating disk, and the end of the rotating shaft away from the second pulley and the second base body are respectively fixed to the axis portion and the eccentric portion of the corresponding rotating disk.

[0008] By adopting the above technical scheme, the power part drives the first pulley to rotate, and under the transmission action of the belt, drives the second pulley, the rotating shaft and the turntable to rotate, thereby driving the second seat body to make eccentric movement on the first seat body, so as to achieve the purpose of moving the Polygonum multiflorum vine in the screen box to screen the Polygonum multiflorum vine in coarse and fine ways. The whole layout makes the power part, the first pulley and the second pulley, which are relatively heavy components, be located in a relatively low position on the first seat body, thereby lowering the center of gravity of the screening machine and improving the stability during operation and movement.

[0009] The utility model is further configured as follows: the connecting mechanism includes a laterally arranged connecting rod and a positioning rod, the connecting rod and the positioning rod are perpendicular to each other, a mounting portion is provided on one side of both ends of the connecting rod, and the two walking wheels are respectively mounted on the corresponding mounting portions, a handle is fixed to the side surface of one end of the connecting rod, a mounting hole is opened on the first seat body for the connecting rod to pass through, a circular ring is sleeved on the connecting rod, an abutment portion is provided on the first seat body below the circular ring, a guide hole is opened on the first seat body for the positioning rod to pass through, a compression spring is sleeved on the positioning rod, two ends of the compression spring are respectively fixed on one end of the first seat body located at the guide hole and on the positioning rod, one end of the positioning rod extends out of the first seat body and the other end abuts against a position close to the upper end on the outer circumference of the circular ring, the vertical distance between the upper side of the abutment portion and the lower side of the positioning rod is the same as the outer diameter of the circular ring, and the connecting rod is provided with a linkage component that causes the circular ring to move down to the position where the circular ring is located between the abutment portion and the positioning rod when the connecting rod rotates.

[0010] By adopting the above technical scheme, when the screening machine needs to be moved after work, the hand handle rotates the connecting rod to make the walking wheel move to the bottom of the connecting rod and support a part of the first seat body. During this process, the linkage assembly on the connecting rod makes the ring drop to the lower end of the outer side of the ring and abut against the upper side of the abutting part. The positioning rod moves to the lower side of one end and abuts against the upper end of the outer side of the ring under the action of the compression spring, that is, the abutting part and the positioning rod clamp the ring to lock the connecting rod. The staff lifts the other part of the first seat body that contacts the ground and can move the screening machine with the help of the walking wheel; when the first seat body needs to contact the ground, the staff pulls the positioning rod through the end of the positioning rod located outside the first seat body to overcome the elastic force of the compression spring and move in the direction away from the ring in its length direction. The staff gently pushes the screening machine, and under the action of gravity, the walking wheel drives the connecting rod to rotate, so that the first seat body contacts the ground. The whole process is very convenient to operate and can be completed without a large number of staff.

[0011] The utility model is further configured as follows: the linkage assembly includes a support rod fixed on the first seat body, the support rod and the connecting rod are parallel to each other, the ring is sleeved on the support rod, and a plurality of protrusions extending toward the inner wall of the ring are circumferentially spaced apart on the outer side of the support rod, a first gear is installed at the end of each of the protrusions, a plurality of the first gears are sleeved with chains, a second gear is fixed on the connecting rod, the second gear is meshed with the chain, each of the first gears is fixedly connected to an abutment rod and each of the abutment rods is provided with a long hole for the chain to pass through.

[0012] By adopting the above technical solution, the staff holds the handle to drive the connecting rod to rotate and then drives the second gear to rotate. Under the transmission action of the chain, the first gear rotates and drives the abutment rod away from the corresponding first gear and close to the chain until the long hole wall of the abutment rod contacts the chain. Since the ring is movable, the ring will drop to the lower end of the outer circumference and abut against the upper side of the abutment part during this process. At the same time, the lower side of one end of the positioning rod abuts against the upper end of the outer circumference of the ring. Due to the restriction of the positioning rod on the ring, the connecting rod cannot rotate, which provides a guarantee for the staff to smoothly move the screening machine with the help of the walking wheels.

[0013] The utility model is further configured as follows: one end of the positioning rod extending out of the first seat body has a bending portion extending upward.

[0014] By adopting the above technical solution, the bending portion is provided to facilitate the staff to grasp the positioning rod and apply force.

[0015] The utility model is further configured as follows: the first screen and the second screen both extend obliquely downward from one end of the screen box toward the other end, the first discharge trough and the second discharge trough are located at one end of the screen box, and the other end of the screen box has an opening communicating with the first screen and the second screen, and the end is also provided with a baffle for sealing the opening.

[0016] By adopting the above technical solution, the screen box is provided with an opening to facilitate the staff to clean the mesh surface of the second screen in the screen box.

[0017] The utility model is further configured as follows: the lower end of the baffle is hinged to the screen box, and a locking piece capable of fixing the baffle on the screen box is provided at a position in the middle of the baffle near the upper end.

[0018] By adopting the above technical solution, the baffle plate and the screen box are connected together in a hinged manner, which makes it easy to open and block the opening.

[0019] The utility model is further configured as follows: the locking member comprises a locking bolt and a butterfly nut screwed on the locking bolt, and the screen box and the baffle are both provided with through holes for the locking bolt to pass through.

[0020] By adopting the above technical solution, the appearance characteristics of the butterfly nut enable the staff to loosen or tighten it with bare hands without using tools, which is very convenient.

[0021] The utility model is further configured as follows: one end of the screen box having the first discharge trough and the second discharge trough is lower than one end of the screen box having the opening.

[0022] By adopting the technical solution, it is easy to export the Polygonum multiflorum on the first sieve and the second sieve.

[0023] The utility model is further configured as follows: the travel wheel is arranged on the side of the first seat body close to a position where the screen box has the opening end.

[0024] By adopting the above technical solution, the distance between the walking wheel and one end of the first seat body is shorter, and the force that needs to be overcome when the staff applies force to rotate the connecting rod is smaller, which provides convenience for the staff's work.

[0025] The beneficial effects of the utility model are:

[0026] 1. During operation, the first seat body is in contact with the ground, so that the screening machine has better stability during operation; when the screening machine needs to be moved, the staff cooperates with the connecting mechanism to make the walking wheels support a part of the first seat body, so that the staff can move the screening machine with the help of the walking wheels.

[0027] 2. When the screening machine needs to be moved, the staff only needs to hold the handle and apply external force to rotate the connecting rod until the walking wheel is directly under the connecting rod. The linkage assembly cooperates with the abutment part and the positioning rod to lock the connecting rod, and no other operation is required by the staff. After moving the screening machine to the required position, the staff only needs to hold the bent part of the positioning rod, pull the positioning rod away from the ring and push the screening machine, and the support rod will rotate until the first seat body contacts the ground, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a three-dimensional structure diagram of a rotary screening machine for the thickness of Polygonum multiflorum vines of the utility model. Figure 1 .

[0030] Figure 2 This is a three-dimensional structure diagram of a rotary screening machine for the thickness of Polygonum multiflorum vines of the utility model. Figure 2 .

[0031] Figure 3 The utility model is a structural schematic diagram of a power component in a Polygonum multiflorum vine thickness rotary screening machine.

[0032] Figure 4 The utility model is a structural schematic diagram of a connecting mechanism in a Polygonum multiflorum vine thickness rotary screening machine.

[0033] Figure 5 The utility model is a schematic diagram of the connection structure of the first gear and the abutment rod in a Polygonum multiflorum thickness rotary screening machine.

[0034] In the figure, 1, the first seat body; 1a, the abutment part; 2, the second seat body; 3, the screen box; 31, the first discharge trough; 32, the second discharge trough; 33, the slag discharge port; 34, the opening; 4, the power assembly; 41, the power member; 42, the first pulley; 43, the second pulley; 44, the belt; 45, the rotating shaft; 46, the rotating disk; 46a, the shaft; 46b, the eccentric part; 5, the first screen; 6, the second screen; 7, the walking wheel; 8, the connecting rod Connecting mechanism; 81, connecting rod; 81a, mounting portion; 82, positioning rod; 82a, bending portion; 83, handle; 84, ring; 85, compression spring; 86, linkage assembly; 861, supporting rod; 861a, protrusion; 862, first gear; 863, chain; 864, second gear; 865, abutting rod; 865a, long hole; 9, baffle; 10, locking piece; 101, locking bolt; 102, butterfly nut. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figures 1 to 5 As shown, a coarse and fine rotary screening machine for Polygonum multiflorum vine comprises a first base body 1, a second base body 2 rotatably connected to the first base body 1, a screen box 3 fixed to the second base body 2, and a power assembly 4 capable of driving the second base body 2 to perform eccentric rotational motion on a horizontal plane, wherein a first screen 5 and a second screen 6 are installed in the screen box 3 at intervals from top to bottom, the screen holes of the first screen 5 are larger than those of the second screen 6, the screen box 3 is provided with a first discharge chute 31 corresponding to the first screen 5, a second discharge chute 32 corresponding to the second screen 6, and a slag discharge port 33 located at the lower end of the screen box 3, walking wheels 7 are provided on opposite sides of the first base body 1, a connecting mechanism 8 is provided between the two walking wheels 7, and the connecting mechanism 8 enables the walking wheels 7 to support a part of the first base body 1 on the ground.

[0037] Further, the power assembly 4 includes a power member 41, a first pulley 42, a second pulley 43, and a belt 44 sleeved on the first pulley 42 and the second pulley 43. The power member 41 is a motor. The shell of the power member 41 is fixed on the first seat body 1. The first pulley 42 is fixed on the output shaft of the power member 41. A vertical rotating shaft 45 is provided on the first seat body 1. The output shaft of the power member 41 is parallel to the rotating shaft 45. The second pulley 43 is fixed on one end of the rotating shaft 45. The first seat body 1 A horizontal turntable 46 is provided between the second seat body 2 and between the other end of the rotating shaft 45 and the second seat body 2. The turntable 46 has a shaft portion 46a in the middle of the lower end and an eccentric portion 46b at the upper end near the edge. The first seat body 1 is rotatably connected to the shaft portion 46a of the corresponding turntable 46, and the second seat body 2 is fixedly connected to the eccentric portion 46b of the corresponding turntable 46. The end of the rotating shaft 45 away from the second pulley 43 and the second seat body 2 are respectively fixedly connected to the shaft portion 46a and the eccentric portion 46b of the corresponding turntable 46.

[0038] Furthermore, the connecting mechanism 8 includes a laterally arranged connecting rod 81 and a positioning rod 82, the connecting rod 81 and the positioning rod 82 are perpendicular to each other, a mounting portion 81a is provided on one side of both ends of the connecting rod 81, and the two walking wheels 7 are respectively mounted on the corresponding mounting portions 81a, a handle 83 is fixed to the side surface of one end of the connecting rod 81, a mounting hole for the connecting rod 81 to pass through is opened on the first base body 1, a ring 84 is sleeved on the connecting rod 81, a contact portion 1a is provided on the first base body 1 below the ring 84, a guide hole for the positioning rod 82 to pass through is opened on the first base body 1, A compression spring 85 is sleeved on the positioning rod 82, and two ends of the compression spring 85 are respectively fixed to one end of the guide hole on the first seat body 1 and the positioning rod 82. One end of the positioning rod 82 extends out of the first seat body 1 and the other end abuts against a position on the outer circumference of the ring 84 near the upper end. The vertical distance between the upper side of the abutting portion 1a and the lower side of the positioning rod 82 is the same as the outer diameter of the ring 84. The connecting rod 81 is provided with a linkage component 86 which causes the ring 84 to move downward to the position between the abutting portion 1a and the positioning rod 82 when the connecting rod 81 rotates.

[0039] Furthermore, the linkage assembly 86 includes a support rod 861 fixed on the first seat body 1, the support rod 861 and the connecting rod 81 are parallel to each other, the ring 84 is sleeved on the support rod 861, and the outer side of the support rod 861 is circumferentially spaced apart with several protrusions 861a extending toward the inner wall of the ring 84, and the end of each of the protrusions 861a is installed with a first gear 862, and several of the first gears 862 are sleeved with a chain 863, and a second gear 864 is fixed on the connecting rod 81, and the second gear 864 is meshed with the chain 863, and each of the first gears 862 is fixedly connected with an abutment rod 865 and each of the abutment rods 865 is provided with a long hole 865a for the chain 863 to pass through.

[0040] Furthermore, one end of the positioning rod 82 extending out of the first base body 1 has a bending portion 82a extending upward.

[0041] Furthermore, the first screen 5 and the second screen 6 extend obliquely downward from one end of the screen box 3 toward the other end, the first discharge trough 31 and the second discharge trough 32 are located at one end of the screen box 3, and the other end of the screen box 3 has an opening 34 communicating with the first screen 5 and the second screen 6, and this end is also provided with a baffle 9 for sealing the opening 34.

[0042] Furthermore, the lower end of the baffle plate 9 is hinged to the screen box 3 , and a locking member 10 capable of fixing the baffle plate 9 on the screen box 3 is provided in the middle portion of the baffle plate 9 near the upper end.

[0043] Furthermore, the locking member 10 includes a locking bolt 101 and a butterfly nut 102 screwed on the locking bolt 101 , and through holes for the locking bolt 101 to pass through are provided on the screen box 3 and the baffle 9 .

[0044] Furthermore, one end of the screen box 3 having the first discharge trough 31 and the second discharge trough 32 is lower than one end of the screen box 3 having the opening 34 .

[0045] Furthermore, the travel wheel 7 is arranged on the side of the first seat body 1 close to the end of the screen box 3 having the opening 34 .

[0046] The working principle of the utility model is as follows: when working, the cut Polygonum multiflorum vine is poured onto the first sieve 5, and the power part 41 drives the first pulley 42 to rotate. Under the transmission action of the belt 44 and the second pulley 43, the rotating shaft 45 and the turntable 46 on the rotating shaft 45 rotate, thereby driving the second seat body 2 and the screen box 3 to make eccentric movement on the first seat body 1, and the Polygonum multiflorum vine shakes on the first sieve 5. The Polygonum multiflorum vine with a diameter smaller than the sieve holes on the first sieve 5 will pass through the sieve holes and fall onto the second sieve 6, and the large diameter will be retained on the first sieve 5. The Polygonum multiflorum vine retained on the first sieve 5 is discharged from the first discharge trough 31 and reaches the Polygonum multiflorum vine on the second sieve 6. The Polygonum multiflorum vine with a large diameter is retained on the second sieve 6. The slag with a small diameter will pass through the sieve holes of the second sieve 6 and be discharged from the slag discharge port 33, and the slag retained on the second sieve 6 will be discharged from the second discharge trough 32, thereby completing the coarse and fine screening of the Polygonum multiflorum vine.

[0047] When it is necessary to move the screening machine, the staff member holds the handle 83 and rotates the connecting rod 81, so that the walking wheel 7 moves to the position directly below the connecting rod 81 and supports a part of the first base body 1. In this process, the connecting rod 81 rotates to drive the second gear 864 to rotate. Under the transmission action of the chain 863, the first gear 862 rotates to drive the abutment rod 865 to swing so that several abutment rods 865 move away from one end of the corresponding first gear 862 and approach the chain 863 until the hole wall of the long hole 865a of the abutment rod 865 contacts the chain 863. Since the ring 84 is movable, the ring 84 will drop to the lower end of the outer periphery and abut against the upper side of the abutment portion 1a during this process. At the same time, the positioning rod 82 moves to the lower side of one end under the action of the compression spring 85 and abuts against the upper end of the outer side of the ring 84, that is, the abutment portion 1a and the positioning rod 82 clamp the ring 84 to lock the connecting rod 81. The staff member lifts the other part of the first base body 1 that contacts the ground and can use the walking wheel 7 to move the screening machine.

[0048] When the first seat body 1 needs to contact the ground, the staff pulls the positioning rod 82 through the bent portion 82a of the positioning rod 82 to overcome the elastic force of the compression spring 85 and move in the direction away from the ring 84 in its length direction. The staff gently pushes the screening machine to rotate the connecting rod 81 until the walking wheel 7 is located on one side thereof, and the first seat body 1 can contact the ground. The whole process is very convenient to operate and can be completed without a large number of staff.

Claims

1. A rotary screening machine for the thickness of Polygonum multiflorum, characterized in that: The invention comprises a first base body (1), a second base body (2) rotatably connected to the first base body (1), a screen box (3) fixed to the second base body (2), and a power assembly (4) capable of driving the second base body (2) to perform eccentric rotational motion on a horizontal plane. A first screen (5) and a second screen (6) are installed in the screen box (3) at intervals from top to bottom. The screen holes of the first screen (5) are larger than the screen holes of the second screen (6). The screen box (3) is provided with a first discharge trough (31) corresponding to the first screen (5), a second discharge trough (32) corresponding to the second screen (6), and a slag discharge port (33) located at the lower end of the screen box (3). Travel wheels (7) are provided on opposite sides of the first base body (1). A connecting mechanism (8) is provided between the two travel wheels (7), and the connecting mechanism (8) enables the travel wheels (7) to support a part of the first base body (1) on the ground.

2. The Polygonum multiflorum thickness rotary screening machine according to claim 1, characterized in that: The power assembly (4) comprises a power piece (41), a first pulley (42), a second pulley (43) and a belt (44) sleeved on the first pulley (42) and the second pulley (43); the power piece (41) is a motor; the housing of the power piece (41) is fixed on the first seat body (1); the first pulley (42) is fixed on the output shaft of the power piece (41); a vertical rotating shaft (45) is provided on the first seat body (1); the output shaft of the power piece (41) and the rotating shaft (45) are parallel to each other; the second pulley (43) is fixed on one end of the rotating shaft (45); the first seat body (1) and the rotating shaft (45) are connected to each other; A transverse turntable (46) is provided between the second seat body (2) and between the other end of the rotating shaft (45) and the second seat body (2); the turntable (46) has an axis portion (46a) in the middle of the lower end and an eccentric portion (46b) near the edge of the upper end; the first seat body (1) is rotatably connected to the axis portion (46a) of the corresponding turntable (46); the second seat body (2) is fixedly connected to the eccentric portion (46b) of the corresponding turntable (46); the end of the rotating shaft (45) away from the second pulley (43) and the second seat body (2) are respectively fixedly connected to the axis portion (46a) and the eccentric portion (46b) of the corresponding turntable (46).

3. The Polygonum multiflorum thickness rotary screening machine according to claim 2, characterized in that: The connecting mechanism (8) comprises a connecting rod (81) and a positioning rod (82) which are arranged transversely, the connecting rod (81) and the positioning rod (82) being perpendicular to each other, a mounting portion (81a) being provided on one side of both ends of the connecting rod (81), the two walking wheels (7) being respectively mounted on the corresponding mounting portions (81a), a handle (83) being fixed to the side surface of one end of the connecting rod (81), a mounting hole for the connecting rod (81) to pass through being provided on the first base body (1), a circular ring (84) being sleeved on the connecting rod (81), a contact portion (1a) being provided on the first base body (1) below the circular ring (84), a guide hole for the positioning rod (82) to pass through being provided on the first base body (1), and the A compression spring (85) is sleeved on the positioning rod (82), and the two ends of the compression spring (85) are respectively fixed to one end of the guide hole on the first seat body (1) and the positioning rod (82). One end of the positioning rod (82) extends out of the first seat body (1) and the other end abuts against a position close to the upper end of the outer circumference of the ring (84). The vertical distance between the upper side of the abutting portion (1a) and the lower side of the positioning rod (82) is the same as the outer diameter of the ring (84). The connecting rod (81) is provided with a linkage component (86) that causes the ring (84) to move downward to a position between the abutting portion (1a) and the positioning rod (82) when the connecting rod (81) rotates.

4. The Polygonum multiflorum thickness rotary screening machine according to claim 3 is characterized in that: The linkage assembly (86) comprises a support rod (861) fixed on the first seat body (1), the support rod (861) and the connecting rod (81) are parallel to each other, the circular ring (84) is sleeved on the support rod (861), a plurality of protrusions (861a) extending toward the inner wall of the circular ring (84) are arranged at intervals on the outer side of the support rod (861) in the circumferential direction, a first gear (862) is installed at the end of each of the protrusions (861a), a plurality of the first gears (862) are sleeved with a chain (863), a second gear (864) is fixed on the connecting rod (81), the second gear (864) is meshed with the chain (863), each of the first gears (862) is fixedly connected to an abutment rod (865), and each of the abutment rods (865) is provided with a long hole (865a) for the chain (863) to pass through.

5. A Polygonum multiflorum thickness rotary screening machine according to claim 3 or 4, characterized in that: One end of the positioning rod (82) extending out of the first seat body (1) has a bent portion (82a) extending upward.

6. A Polygonum multiflorum thickness rotary screening machine according to any one of claims 1 to 4, characterized in that: The first screen (5) and the second screen (6) both extend obliquely downward from one end of the screen box (3) toward the other end; the first discharge trough (31) and the second discharge trough (32) are located at one end of the screen box (3); the other end of the screen box (3) has an opening (34) communicating with the first screen (5) and the second screen (6), and the end is also provided with a baffle (9) for blocking the opening (34).

7. The Polygonum multiflorum thickness rotary screening machine according to claim 6, characterized in that: The lower end of the baffle (9) is hinged to the screen box (3), and a locking piece (10) capable of fixing the baffle (9) on the screen box (3) is provided at a position in the middle of the baffle (9) near the upper end.

8. The Polygonum multiflorum thickness rotary screening machine according to claim 7, characterized in that: The locking member (10) comprises a locking bolt (101) and a butterfly nut (102) screwed onto the locking bolt (101); and through holes for the locking bolt (101) to pass through are provided on the screen box (3) and the baffle (9).

9. The Polygonum multiflorum thickness rotary screening machine according to claim 6, characterized in that: One end of the screen box (3) having the first discharge trough (31) and the second discharge trough (32) is lower than one end of the screen box (3) having the opening (34).

10. The Polygonum multiflorum thickness rotary screening machine according to claim 9, characterized in that: The travel wheel (7) is arranged on the side of the first seat body (1) at a position close to one end of the screen box (3) having the opening (34).

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