Torsion spring finger clip seed meter

Abstract

This invention discloses a torsion spring type finger clamp seed metering device, relating to the field of agricultural machinery sowing technology, comprising: a housing; a back plate, the back plate dividing the cavity in the housing into a seed filling chamber and a seed metering chamber; a seed metering port provided on the back plate; a finger clamp driving mechanism, the finger clamp driving mechanism including an input shaft and a finger clamping disc sleeved on the input shaft and circumferentially connected to the input shaft; multiple torsion spring type finger clamps evenly distributed circumferentially along the axis of the finger clamping disc, each torsion spring type finger clamp including a finger clamping piece, a finger clamping arm, a finger clamping lever, and a double torsion spring sleeved on the finger clamping arm; a slip ring circumferentially engaged with the back plate, the slip ring having a seed filling area and a seed clamping area on the side near the finger clamping lever, the seed filling area protruding more than the seed clamping area, the finger clamping lever being able to slide in contact with the seed filling area and the seed clamping area sequentially when the finger clamping disc rotates. This invention has a long service life, is easy to use, can meet the sowing requirements of various seeds, and has strong applicability.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery tillage and sowing technology, and in particular to a torsion spring type finger clamp seed metering device. Background Technology

[0002] my country is a major agricultural country, requiring advanced and efficient agricultural equipment to serve agricultural production, improve the standardization and precision of agricultural production, and reduce the labor intensity of farmers. The seed metering device is a key working component of the seeder, and its performance directly affects the seeder's operating efficiency and sowing accuracy. With the advancement of agricultural technology and breeding techniques, traditional sowing methods suffer from problems such as seed waste and high costs associated with manual thinning. Existing seed metering methods for seeders include scoop wheel type, finger clamp type, scoop clamp type, air suction type, and air blow type. Although scoop wheel type, finger clamp type, and scoop clamp type seed meterers have greatly improved seeding speed and accuracy compared to traditional seeding methods, they still have certain defects in performance and structure. For example, scoop wheel type seed meterers are not suitable for high-speed seeding and have poor vibration resistance. Finger clamp type and scoop clamp type seed meterers have improved seeding speed and accuracy compared to scoop wheel type seed meterers, but they are far behind air suction type seed meterers in performance. Air suction type seed meterers require a large drive unit and have the best performance among these seed meterers. Air suction type seed meterers also have their application limitations, such as requiring a large matching agricultural machine and being unsuitable for use with low-horsepower agricultural machines. Seeders with 4 rows or less basically use scoop wheel type, finger clamp type, or scoop clamp type seed meterers. Among these three types of seed meterers, the finger clamp type seed meterer has the best performance.

[0003] Although existing finger-clamp seed metering devices, both domestically and internationally, have the advantages of simple structure and ease of use, they also have the following disadvantages:

[0004] (1) The existing finger clamp seed metering device adopts a double tension spring structure. The tension spring hole and tension spring on one finger clamp are severely worn, which makes the tension spring lug easy to break, directly affecting the service life of the seed metering device. When the finger clamp opening is large, the finger clamping force is too large, and when the finger clamp opening is small, the finger clamping force is too small. The insufficient clamping force affects the clamping of small seeds, causing the finger clamp to lose seeds and affecting the precision sowing rate. The excessive clamping force causes the tension spring to be overloaded and fatigued, and the torque is severely reduced.

[0005] (2) The existing finger clamp seed metering device uses the inner side of the finger clamp plate as a reference to adjust the size of the finger clamp opening. Therefore, the back of the slip ring and the inner side of the finger clamp plate are in surface friction, which causes severe wear on the finger clamp plate and the finger clamp slip ring. A shim needs to be added between them to adjust the size of the finger clamp opening.

[0006] (3) The replacement and maintenance of the finger clips and finger clip slip rings of the existing finger clip seed metering device are relatively troublesome;

[0007] (4) Short service life, which increases the cost of use;

[0008] (5) Strict requirements on seed size and shape, which can easily damage the seeds. Summary of the Invention

[0009] The purpose of this invention is to provide a torsion spring type finger clamp seed metering device to solve the problems existing in the prior art and improve the service life of the finger clamp seed metering device.

[0010] To achieve the above objectives, the present invention provides the following solution:

[0011] This invention provides a torsion spring type finger clamp seed metering device, comprising:

[0012] case;

[0013] The back plate divides the cavity in the shell into a seed filling chamber and a seed discharging chamber; the back plate is provided with a seed discharging port, and the shell is provided with a seed inlet pipe communicating with the seed filling chamber and a seed dropping port communicating with the seed discharging chamber;

[0014] A finger clamp driving mechanism, the finger clamp driving mechanism including an input shaft and a finger clamp disc sleeved on the input shaft and circumferentially connected to the input shaft;

[0015] Multiple torsion spring finger clips are evenly distributed circumferentially along the axis of the finger clip disc. Each torsion spring finger clip includes a finger clip plate, a finger clip arm, a finger clip lever, and a double torsion spring sleeved on the finger clip arm. The finger clip arm is rod-shaped, the finger clip plate is fixed to one end of the finger clip arm, and the finger clip lever is fixed to the other end of the finger clip arm. A fixing rod is provided on the finger clip arm. The double torsion spring includes a first spring body and a second spring body. One end of the first spring body is connected to one end of the second spring body through a U-shaped connecting rod, and the fixing rod abuts against the U-shaped connecting rod. Both ends of the double torsion spring are used to abut against the finger clip disc. The finger clip disc is provided with a placement groove corresponding to the finger clip arm, and the finger clip arm rotatably engages with the placement groove. Both the finger clip disc and the torsion spring finger clips are located in the seed filling chamber. The finger clip plate is used to engage with the side of the back plate to clamp the seeds.

[0016] A slip ring is circumferentially engaged with the back plate. The slip ring has a seed filling area and a seed clamping area on the side near the finger clamp lever. The seed filling area protrudes from the seed clamping area. When the finger clamp lever rotates with the finger clamp disc, it can slide and contact the seed filling area and the seed clamping area in sequence. When the finger clamp plate rotates to the seed discharge port, the finger clamp lever in the same torsion spring finger clamp slides and engages with the seed clamping area.

[0017] Preferably, the housing includes a seed filling shell located on one side of the back plate and a seed discharging shell located on the other side of the back plate, wherein the seed filling shell, the edge of the back plate, and the seed discharging shell are connected by bolts; the seed inlet tube is disposed on the seed filling shell, and the seed outlet is disposed on the seed discharging shell.

[0018] Preferably, a first hook is provided at the other end of the first spring body, a second hook is provided at the other end of the second spring body, a connecting plate is fixed on the finger clamp, and the first hook and the second hook are both hung on the connecting plate and abut against the connecting plate;

[0019] The finger clamp arm is also fixedly provided with a positioning ring, and the finger clamp plate is provided with a positioning groove. The positioning ring is partially located in the positioning groove, and the positioning groove and the positioning ring cooperate to achieve the positioning of the finger clamp arm.

[0020] A pressure ring can also be detachably connected to the finger clamping plate, and the finger clamping arm is located between the placement groove and the pressure ring.

[0021] Preferably, the seed metering chamber is further provided with a first seed guide wheel sleeved on the input shaft and circumferentially connected to the input shaft. The outer side wall of the first seed guide wheel has a plurality of teeth evenly distributed circumferentially for actuating the seed guide belt.

[0022] The seed dispensing chamber is also provided with a second seed guide wheel located above the seed dispensing port and below the first seed guide wheel. The second seed guide wheel is rotatably engaged with a first fixed shaft on the housing via a bearing. The seed guide belt is wound around the first seed guide wheel and the second seed guide wheel.

[0023] Preferably, it further includes a slip ring gap adjusting mechanism, the slip ring gap adjusting mechanism comprising:

[0024] A backplate bearing housing for fixed connection with a backplate; the slip ring is sleeved on the backplate bearing housing, the slip ring is circumferentially fixedly connected to the backplate bearing housing, and the slip ring is axially sliding relative to the backplate bearing housing;

[0025] Studs fixed to the back plate bearing housing;

[0026] Bolts threadedly connected to the stud;

[0027] A connector includes a threaded sleeve, a convex ring, and a screw block arranged coaxially. The threaded sleeve is threadedly connected to the stud. One end of the threaded sleeve and the screw block are respectively fixed to the convex ring. The convex ring is located between the threaded sleeve and the screw block. A through hole is provided on the slip ring corresponding to the threaded sleeve. The threaded sleeve passes through the through hole. The diameter of the convex ring is larger than the diameter of the through hole, and the through hole is located between the stud and the convex ring. The convex ring abuts against the slip ring.

[0028] A knob, comprising a screwing part and a snap-fit ​​part capable of circumferentially engaging with the screw block, the knob being integrally formed, the screwing part having a screwing opening, the screwing opening being polygonal in shape;

[0029] A first limiting piece is detachably connected to the slip ring by a screw. The first limiting piece has a notch for limiting the rotation of the screwing part, and the screwing part is wholly or partially located in the notch.

[0030] Preferably, the back plate bearing seat is provided with a groove; the slip ring is provided with a locking block, and the locking block engages with the groove;

[0031] The slip ring gap adjustment mechanism also includes a third spring. A blind hole is provided on the screw block. The third spring is partially disposed in the blind hole. One end of the third spring abuts against the closed end of the blind hole, and the other end abuts against the snap-fit ​​part.

[0032] The back plate bearing seat is fixedly connected to the back plate of the finger clamp seed metering device, and rotates with the input shaft of the finger clamp seed metering device through the bearing; the screw block is a regular hexagonal prism; the screwing port is triangular.

[0033] Preferably, the end of the input shaft extending into the seed filling chamber is provided with an adjusting handwheel, a sleeve, and a fourth spring. The sleeve is a polygonal prism and is threadedly connected to the input shaft. The adjusting handwheel is sleeved on the sleeve and circumferentially engaged with it. The fourth spring is disposed between the adjusting handwheel and the sleeve, with one end abutting against the stepped surface on the sleeve and the other end abutting against the adjusting handwheel. The end of the adjusting handwheel near the finger clamp is engaged with the finger clamp. The fourth spring is used to ensure that the adjusting handwheel and the finger clamp are in close contact.

[0034] The input shaft is also provided with a first limiting pin for engaging with the finger clamping disc. The finger clamping disc is located between the limiting pin and the adjusting handwheel, and the first limiting pin and the adjusting handwheel clamp the finger clamping disc.

[0035] Preferably, the seed filling shell is further provided with a seed unloading door and a switching mechanism. One end of the seed unloading door is rotatably connected to the seed filling shell, and the other end is provided with a baffle plate. The switching mechanism includes a second fixed shaft, a torsion spring, and a stop rod. The second fixed shaft is fixedly connected to the seed filling shell. The seed filling shell is provided with a plurality of limiting holes distributed circumferentially along the second fixed shaft. The torsion spring is sleeved on the second fixed shaft. One end of the torsion spring abuts against one of the limiting holes, and the other end abuts against the stop rod. One end of the stop rod is rotatably sleeved on the second fixed shaft, and the other end of the stop rod is used to limit the baffle plate.

[0036] Preferably, the input shaft is rotatably engaged with the seed metering shell via a bearing, and the input shaft is rotatably engaged with the back plate bearing seat via a bearing.

[0037] Preferably, the input shaft is further provided with a second limiting pin for engaging with the first guide wheel.

[0038] The present invention achieves the following technical effects compared to the prior art:

[0039] The torsion spring type finger clamp seed metering device of the present invention adopts a double torsion spring and a finger clamp arm coaxially installed. The hook of the double torsion spring has no relative movement with the finger clamp plate and the finger clamp arm and will not generate friction, resulting in a longer service life and moderate clamping force on the seeds, making it more suitable for small seed sowing.

[0040] In the torsion spring type finger clamp seed metering device of the present invention, the slip ring is circumferentially fixedly connected to the back plate bearing seat, and the slip ring can slide axially relative to the back plate bearing seat. Furthermore, the distance between the slip ring and the bearing seat can be adjusted by the slip ring gap adjustment mechanism to achieve the purpose of adjusting the size of the finger clamp opening.

[0041] Furthermore, since the hook of the double torsion spring abuts against the finger clip arm and finger clip plate, when the finger clip arm rotates, it is a circumferential rotation along the axis of the double torsion spring, which does not cause the double torsion spring to move axially and does not cause the hook to move. Therefore, there is no mutual friction between the hook of the double torsion spring and the finger clip arm and finger clip plate, so the hook of the double torsion spring will not be easily worn or broken. In addition, the torque of the double torsion spring changes linearly and smoothly, so the torque of the double torsion spring acting on the finger clip is basically balanced regardless of whether the finger clip opening is large or small.

[0042] Furthermore, the slip ring gap adjustment mechanism in the torsion spring type finger clamp seed metering device of the present invention can drive the connecting part to rotate by rotating the knob, thereby adjusting the length of the threaded connection between the threaded sleeve and the stud in the connecting part, thereby adjusting the gap between the slip ring and the back plate, and thus realizing the adjustment of the finger clamp opening size of the finger clamp that cooperates with the slip ring, which can meet the sowing requirements of various seeds and has strong applicability.

[0043] Furthermore, the slip ring gap adjustment mechanism in the torsion spring type finger clamp seed meter of the present invention does not require disassembling the slip ring or adding a shim between the slip ring and the back plate during adjustment, making it convenient to use.

[0044] Furthermore, the adjusting handwheel and the first limiting pin in the torsion spring type finger clamp seed meter of the present invention clamp the finger clamp disc. The finger clamp disc can be removed by unscrewing the adjusting handwheel and the sleeve, making the replacement, disassembly and maintenance of the finger clamp disc convenient. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the torsion spring type finger clamp seed metering device of the present invention;

[0047] Figure 2 This is a schematic diagram of the torsion spring type finger clamp seed metering device of the present invention;

[0048] Figure 3 This is a partial structural schematic diagram of the torsion spring type finger clamp seed metering device of the present invention;

[0049] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0050] Figure 5 This is a schematic diagram of the torsion spring finger clip in this invention;

[0051] Figure 6 This is a schematic diagram of the slip ring gap adjustment mechanism of the present invention;

[0052] Figure 7 This is a schematic diagram of the slip ring gap adjustment mechanism of the present invention;

[0053] Figure 8 for Figure 2 A schematic diagram of the AA cross-section;

[0054] Figure 9 for Figure 2 BB cross-sectional diagram;

[0055] Figure 10 This is a partial structural schematic diagram of the slip ring gap adjustment mechanism of the present invention;

[0056] Figure 11 This is a schematic diagram of the back plate bearing seat in the slip ring clearance adjustment mechanism of the present invention;

[0057] Figure 12 This is a schematic diagram of the slip ring structure in the slip ring clearance adjustment mechanism of the present invention;

[0058] Figure 13 This is a schematic diagram of the slip ring structure in the slip ring clearance adjustment mechanism of the present invention;

[0059] Figure 14 This is a schematic diagram of the connecting member in the slip ring clearance adjustment mechanism of the present invention;

[0060] Figure 15 This is a schematic diagram of the connecting member in the slip ring clearance adjustment mechanism of the present invention;

[0061] Figure 16 This is a schematic diagram of the knob in the slip ring gap adjustment mechanism of the present invention;

[0062] Figure 17 This is a schematic diagram of the knob in the slip ring gap adjustment mechanism of the present invention;

[0063] Figure 18 This is a schematic diagram of the torsion spring type finger clamp seed metering device of the present invention;

[0064] Figure 19 for Figure 18 A schematic diagram of the CC cross-section;

[0065] Among them, 1. Slip ring; 101. Through hole; 102. Placement groove; 103. Clamping block; 2. Back plate bearing seat; 201. Bearing seat body; 202. Bearing seat flange; 203. Clamping groove; 3. Input shaft; 4. Knob; 401. Tightening part; 402. Clamping part; 403. Tightening port; 5. First limiting piece; 6. Screw; 7. Third spring; 8. Connecting piece; 801. Tightening block; 802. Convex ring; 803. Threaded sleeve; 804. Blind hole; 805. Seed clamping area; 806. Seed filling area; 9. Stud; 10. Bolt; 11. Seed inlet tube; 1 2. Seed shell discharge; 13. Seed unloading gate; 14. Baffle plate; 15. Baffle rod; 16. Second limiting plate; 17. Torsion spring; 18. Finger clamp plate; 19. Finger clamp arm; 20. Positioning ring; 21. First spring body; 22. U-shaped connecting rod; 23. Second spring body; 24. First hook; 25. Second hook; 26. Fixing rod; 27. Finger clamp lever; 28. Finger clamp plate; 29. ​​Connecting plate; 30. Pressure ring; 31. Seed shell filling; 32. Adjusting handwheel; 33. Fourth spring; 34. Sleeve; 35. Back plate; 36. First seed guide wheel; 37. Tooth. Detailed Implementation

[0066] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] The purpose of this invention is to provide a torsion spring type finger clamp seed metering device to solve the problems existing in the prior art and improve the service life of the finger clamp seed metering device.

[0068] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0069] like Figures 1-19 As shown, this embodiment provides a torsion spring type finger clamp seed metering device, including a housing, a back plate 35, a slip ring 1, multiple torsion spring type finger clamps and a finger clamp driving mechanism.

[0070] The back plate 35 divides the cavity in the shell into a seed filling chamber and a seed discharging chamber; a seed discharging port is provided on the back plate 35, and a seed inlet pipe 11 communicating with the seed filling chamber and a seed dropping port communicating with the seed discharging chamber are provided on the shell.

[0071] The finger clamp drive mechanism includes an input shaft 3 and a finger clamp disc 28 sleeved on the input shaft 3 and circumferentially connected to the input shaft 3; the input shaft 3 is connected to the output end of a drive device (such as an engine), and the drive device drives the input shaft 3 to rotate, thereby driving the finger clamp disc 28 to rotate.

[0072] All torsion spring finger clips are evenly distributed circumferentially along the axis of the finger clip disc 28; each torsion spring finger clip includes a finger clip piece 18, a finger clip arm 19, a finger clip lever 27, and a double torsion spring sleeved on the finger clip arm 19. The finger clip arm 19 is rod-shaped, with the finger clip piece 18 fixed at one end and the finger clip lever 27 fixed at the other end. A fixing rod 26 is provided on the finger clip arm 19; the double torsion spring includes a first spring body 21 and a second spring body 2. 3. One end of the first spring body 21 is connected to one end of the second spring body 23 via a U-shaped connecting rod 22, and the fixing rod 26 abuts against the U-shaped connecting rod 22; both ends of the double torsion spring are used to abut against the finger clamping plate 28, and the finger clamping plate 28 is provided with a placement groove 102 corresponding to the finger clamping arm 19, and the finger clamping arm 19 is rotatably engaged with the placement groove 102; the finger clamping plate 28 and the torsion spring finger clamp are both located in the seed filling chamber, and the finger clamping piece 18 is used to cooperate with the side of the back plate 35 to clamp the seeds;

[0073] The slip ring 1 is circumferentially engaged with the back plate 35. The slip ring 1 has a seed filling area 806 and a seed clamping area 805 on the side near the finger clamp lever 27. The seed filling area 806 protrudes from the seed clamping area 805. When the finger clamp lever 27 rotates with the finger clamping disc 28, it can slide and contact the seed filling area 806 and the seed clamping area 805 in sequence. When the finger clamping plate 18 rotates to the seed discharge port, the finger clamp lever 27 in the same torsion spring finger clamp slides and engages with the seed clamping area 805.

[0074] The specific principles of seed filling, seed clamping, and seed arrangement in this embodiment are as follows:

[0075] When the input shaft 3 drives the finger clamping disc 28 to rotate, all the torsion spring finger clamps rotate together with the finger clamping disc 28. The finger clamp lever 27 in the torsion spring finger clamp slides in cooperation with the seed filling area 806 and the seed clamping area 805 on the slip ring 1. Taking one of the torsion spring finger clamps as an example, since the seed filling area 806 protrudes from the seed clamping area 805, when the finger clamp lever 27 in the torsion spring finger clamp transitions from the seed clamping area 805 to the seed filling area 806, the larger thickness of the seed filling area 806 relative to the seed clamping area 805 will drive the finger clamp lever 27 to rotate, causing the finger clamp piece 18 to rotate, which in turn makes the opening between the finger clamp piece 18 and the side of the back plate 35 larger, so that the seeds in the seed filling chamber can be located between the finger clamp piece 18 and the side of the back plate 35, thereby realizing seed filling.

[0076] When the finger clip lever 27 in the torsion spring finger clip transitions from the seed filling area 806 to the seed clamping area 805, the greater thickness of the seed clamping area 805 compared to the seed filling area 806 causes the finger clip arm 19 to rotate under the elastic force of the double torsion spring. At the same time, the finger clip piece 18 rotates, causing the opening between the finger clip piece 18 and the side of the back plate 35 to widen, thereby clamping the seeds located between the finger clip piece 18 and the side of the back plate 35, thus achieving seed clamping.

[0077] After the seed clamping is completed, when the finger clamp 18 in the torsion spring finger clamp rotates to the seed discharge port on the back plate 35, the finger clamp 18 rotates under the elastic force of the double torsion spring, and the clamped seeds are ejected into the seed discharge chamber. The seeds in the seed discharge chamber are finally discharged through the seed drop port at the bottom of the seed discharge chamber, thereby realizing seed discharge.

[0078] In the optional embodiment, the preferred option is that the shell includes a seed filling shell 31 located on one side of the back plate 35 and a seed discharging shell 12 located on the other side of the back plate 35. The seed filling shell 31 and the seed discharging shell 12 are joined together to form the shell. The seed filling shell 31, the edge of the back plate 35 and the seed discharging shell 12 are connected by bolts 10. The seed inlet tube 11 is provided on the seed filling shell 31 and the seed outlet is provided on the seed discharging shell 12.

[0079] In the optional embodiments of this example, a preferred embodiment is that the seed filling shell 31 is further provided with a seed unloading door 13 and a switching mechanism. One end of the seed unloading door 13 is rotatably connected to the seed filling shell 31, and the other end is provided with a baffle 14. The switching mechanism includes a second fixed shaft, a torsion spring 17, and a stop rod 15. The second fixed shaft is fixedly connected to the seed filling shell 31. The seed filling shell 31 is provided with a plurality of limiting holes distributed circumferentially along the second fixed shaft. The torsion spring 17 is sleeved on the second fixed shaft. One end of the torsion spring 17 abuts against a limiting hole, and the other end abuts against the stop rod 15. One end of the stop rod 15 is rotatably sleeved on the second fixed shaft, and the other end of the stop rod 15 is used to limit the baffle 14.

[0080] It should be noted that by having the torsion spring 17 abut against different limiting holes, the elastic force that the torsion spring 17 provides to the stop rod 15 can be adjusted; a second limiting piece 16 for limiting the stop rod 15 is also provided on the fixed shaft.

[0081] In a preferred embodiment, the first spring body 21 has a first hook 24 at one end, the second spring body 23 has a second hook 25 at one end, and a connecting plate 29 is fixedly mounted on the finger clamping disc 28. Both the first hook 24 and the second hook 25 are hooked onto the connecting plate 29 and abut against it. In this embodiment, a positioning ring 20 is also fixedly mounted on the finger clamping arm 19, and a positioning groove is provided on the finger clamping disc 28. The positioning ring 20 is partially located in the positioning groove, and the positioning groove and the positioning ring 20 cooperate to achieve axial positioning of the finger clamping arm 19. In this embodiment, a placement groove 102 is provided on the finger clamping disc 28 corresponding to the finger clamping arm 19, and the finger clamping arm 19 rotatably engages with the placement groove 102. In this embodiment, a pressure ring 30 can also be detachably connected to the finger clamp plate 28. The finger clamp arm 19 is located between the placement groove 102 and the pressure ring 30. The pressure ring 30 presses the finger clamp arm 19 into the placement groove 102, making it difficult for the finger clamp arm 19 to detach from the placement groove 102, thereby improving the working stability of the torsion spring finger clamp structure in this embodiment.

[0082] In this embodiment, a slot is provided on the finger clamp 28 corresponding to the pressure ring 30, and the pressure ring 30 can be locked in the slot. Of course, in practical applications, other methods can also be used to achieve a detachable connection between the pressure ring 30 and the finger clamp 28, such as making the pressure ring 30 detachably connected to the finger clamp 28 by bolts.

[0083] In this embodiment, the double torsion spring finger clip structure is coaxially installed with the finger clip arm 19. There is no relative translational movement between the double torsion spring and the connecting plate 29 on the finger clip plate 28, or between the double torsion spring and the finger clip arm 19, so there will be no frictional wear and the service life will be longer. The double torsion spring makes the clamping force of the finger clip 18 on the seeds moderate, and the adaptability to the sowing of small seeds is stronger.

[0084] In the optional scheme of this embodiment, a more preferred embodiment is that the seeding chamber is further provided with a first seed guide wheel 36 sleeved on the input shaft 3 and circumferentially connected to the input shaft 3. The outer side wall of the first seed guide wheel 36 is evenly distributed with a plurality of teeth 37 for actuating the seed guide belt.

[0085] The seed metering chamber is also equipped with a second seed guide wheel located above the seed outlet and below the first seed guide wheel 36. The second seed guide wheel is rotatably engaged with the first fixed shaft on the housing via a bearing. A seed guide belt (not shown in the figure) is wound around the first seed guide wheel and the second seed guide wheel. The seed guide belt has paddles evenly distributed along its circumference. The seed guide belt, two adjacent paddles, and the inner wall of the seed metering chamber form a seed conveying cavity. When the input shaft 3 rotates, it drives the first seed guide wheel 36 to rotate. The first seed guide wheel 36 drives the seed guide belt to rotate through multiple teeth 37. After the seeds enter the seed metering chamber, they enter one of the aforementioned seed conveying cavities. When the seed guide belt rotates, the position of the seed conveying cavity also changes. When the seed conveying cavity containing the seeds rotates to above the seed outlet, the seeds fall through the seed outlet, completing the seed metering.

[0086] The first seed guide wheel 36 and the second seed guide wheel are designed to ensure that the seeds in the seed metering chamber fall more orderly and smoothly, and to prevent the seeds in the seed metering chamber from becoming blocked.

[0087] In the optional embodiments of this example, a more preferred option is that the input shaft 3 is further provided with a second limiting pin for engaging with the first seed guide wheel 36.

[0088] In the optional solutions of this embodiment, a more preferred option is to further include a slip ring 1 gap adjustment mechanism. The slip ring 1 gap adjustment mechanism is mainly used to adjust the distance between the slip ring 1 and the bearing seat to adjust the size of the finger clip opening (i.e., the opening between the finger clip 18 and the side of the back plate 35). In this embodiment, the slip ring 1 gap adjustment mechanism specifically includes a back plate bearing seat 2, a slip ring 1, a stud 9, a bolt 10, a connector 8, a spring, a knob 4, and a limiting piece.

[0089] The back plate bearing seat 2 includes a bearing seat body 201 and a bearing seat flange 202. The bearing seat flange 202 is fixedly connected to the back plate 35 of the finger clamp seed meterer. The bearing seat body 201 is rotatably engaged with the input shaft 3 of the finger clamp seed meterer through a bearing.

[0090] The slip ring 1 is sleeved on the bearing housing body 201 of the back plate bearing housing 2. The slip ring 1 is circumferentially fixedly connected to the bearing housing body 201 of the back plate bearing housing 2, and the slip ring 1 can slide axially relative to the back plate bearing housing 2.

[0091] Specifically, a groove 203 is provided on the back plate bearing seat 2; the length direction of the groove 203 is along the axial direction of the bearing seat, and a locking block 103 is provided on the slip ring 1. The locking block 103 engages with the groove 203, but the locking block 103 can slide along the axial direction of the back plate bearing seat 2 in the groove 203.

[0092] One end of the stud 9 is threaded to the bearing seat flange 202 of the back plate bearing seat 2, and the other end extends out of the bearing seat flange 202. The bolt 10 is threaded to the part of the stud 9 that extends out of the bearing seat flange 202.

[0093] The connector 8 includes a threaded sleeve 803, a convex ring 802, and a screw block 801 arranged coaxially. The threaded sleeve 803 is threadedly connected to the stud 9. One end of the threaded sleeve 803 and the screw block 801 are fixedly connected to the convex ring 802. The convex ring 802 is located between the threaded sleeve 803 and the screw block 801. A through hole 101 is provided on the slip ring 1 corresponding to the threaded sleeve 803. The threaded sleeve 803 passes through the through hole 101. The diameter of the convex ring 802 is larger than the diameter of the through hole 101, and the through hole 101 is located between the stud 9 and the convex ring 802. The convex ring 802 abuts against the slip ring 1.

[0094] The knob 4 includes a screwing part 401 and a snap-fit ​​part 402 that can be circumferentially snapped onto the screw block 801. The knob 4 is integrally formed. The screwing part 401 is provided with a screwing opening 403, which is polygonal in shape. In this embodiment, the screwing opening 403 is triangular.

[0095] In this embodiment, the screw block 801 is a regular hexagonal prism, and the screwing part 401 is provided with a groove of the same shape and size as the screw block 801.

[0096] A blind hole 804 is provided on the screw block 801. The third spring 7 is partially disposed in the blind hole 804. One end of the third spring 7 abuts against the closed end of the blind hole 804, and the other end abuts against the snap-fit ​​part 402.

[0097] The first limiting piece 5 is detachably connected to the slip ring 1 by a screw 6. The first limiting piece 5 is provided with a notch for limiting the rotation of the screwing part 401. The screwing part 401 is located entirely or partially in the notch. In this embodiment, the slip ring 1 is provided with a placement groove 102 corresponding to the first limiting piece 5. The first limiting piece 5 is engaged in the placement groove 102.

[0098] The method of using the slip ring 1 clearance adjustment mechanism in this embodiment is as follows:

[0099] When it is necessary to increase the gap between the slip ring 1 and the back plate 35, firstly, unscrew the screw 6 and remove the first limiting piece 5 from the placement groove 102. Then, press the knob 4 with a wrench or other tools to overcome the elastic force of the third spring 7, so that the locking part 402 of the knob 4 is fitted onto the screw block 801 of the connector 8. Then, rotate the screwing part 401 of the knob 4 with a wrench or other tools, and drive the connector 8 to rotate, thereby adjusting the length of the threaded connection between the threaded sleeve 803 and the stud 9 in the connector 8. Then, manually adjust the position of the slip ring 1, thereby adjusting the gap between the slip ring 1 and the back plate 35. After the position of the slip ring 1 is adjusted to the correct position, rotate the bolt 10 on the stud 9 with a wrench or other tools, so that the bolt 10 and the convex ring 802 in the connector 8 clamp the slip ring 1, thereby fixing the position of the slip ring 1 and adjusting the size of the finger clamp opening of the finger clamp that cooperates with the slip ring 1. Then, install the first limiting piece 5 back on the placement groove 102.

[0100] When it is necessary to reduce the gap between the slip ring 1 and the back plate 35, firstly, use a wrench or other tools to rotate the bolt 10 on the stud 9 so that the bolt 10 moves away from the slip ring 1. The distance the bolt 10 moves should be equal to the value that the gap needs to be reduced. Then, unscrew the screw 6 and take out the first limiting piece 5 from the placement groove 102. Then, use a wrench or other tools to press the knob 4 so that the locking part 402 of the knob 4 is fitted onto the screw block 801 of the connector 8. Then, use a wrench or other tools to rotate the screwing part 401 of the knob 4 and drive the connector 8 to rotate so that the connector 8 moves toward the bolt 10. At the same time, the connector 8 drives the slip ring 1 to move toward the bolt 10, thereby adjusting the gap between the slip ring 1 and the back plate 35 until the convex ring 802 in the connector 8 and the bolt 10 clamp the slip ring 1. This achieves the adjustment of the position of the slip ring 1, and thus achieves the adjustment of the finger opening size of the finger clip that cooperates with the slip ring 1. Then, the first limiting piece 5 is reinstalled on the placement groove 102.

[0101] In the optional scheme of this embodiment, a more preferred embodiment is that the end of the input shaft 3 that extends into the seed filling chamber is provided with an adjusting handwheel 32, a sleeve 34 and a fourth spring 33. The sleeve 34 is a polygonal prism and is threadedly connected to the input shaft 3. The adjusting handwheel 32 is sleeved on the sleeve 34 and is circumferentially engaged with the sleeve 34. The fourth spring 33 is disposed between the adjusting handwheel 32 and the sleeve 34. One end of the fourth spring 33 abuts against the stepped surface on the sleeve 34 and the other end abuts against the adjusting handwheel 32. The end of the adjusting handwheel 32 near the finger clamp 28 is engaged with the finger clamp 28. The fourth spring 33 is used to make the adjusting handwheel 32 and the finger clamp 28 in close contact.

[0102] The input shaft 3 is also provided with a first limiting pin for engaging with the finger clamp 28. The finger clamp 28 is located between the limiting pin and the adjusting handwheel 32. Under the action of the elastic force given by the fourth spring 33, the adjusting handwheel 32 and the first limiting pin clamp the finger clamp 28.

[0103] In the optional schemes of this embodiment, it is more preferred that the input shaft 3 is rotatably engaged with the seeding shell 12 through a bearing, and the input shaft 3 is rotatably engaged with the back plate bearing seat 2 through a bearing.

[0104] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A torsion spring type finger clamp seed metering device, characterized in that, include: case; The back plate divides the cavity in the shell into a seed filling chamber and a seed discharging chamber; the back plate is provided with a seed discharging port, and the shell is provided with a seed inlet pipe communicating with the seed filling chamber and a seed dropping port communicating with the seed discharging chamber; A finger clamp driving mechanism, the finger clamp driving mechanism including an input shaft and a finger clamp disc sleeved on the input shaft and circumferentially connected to the input shaft; Multiple torsion spring finger clips are evenly distributed circumferentially along the axis of the finger clip disc. Each torsion spring finger clip includes a finger clip plate, a finger clip arm, a finger clip lever, and a double torsion spring sleeved on the finger clip arm. The finger clip arm is rod-shaped, the finger clip plate is fixed to one end of the finger clip arm, and the finger clip lever is fixed to the other end of the finger clip arm. A fixing rod is provided on the finger clip arm. The double torsion spring includes a first spring body and a second spring body. One end of the first spring body is connected to one end of the second spring body through a U-shaped connecting rod, and the fixing rod abuts against the U-shaped connecting rod. Both ends of the double torsion spring are used to abut against the finger clip disc. The finger clip disc is provided with a placement groove corresponding to the finger clip arm, and the finger clip arm rotatably engages with the placement groove. Both the finger clip disc and the torsion spring finger clips are located in the seed filling chamber. The finger clip plate is used to engage with the side of the back plate to clamp the seeds. A slip ring is circumferentially engaged with the back plate. The slip ring has a seed filling area and a seed clamping area on the side near the finger clamp lever. The seed filling area protrudes from the seed clamping area. When the finger clamp lever rotates with the finger clamp disc, it can slide and contact the seed filling area and the seed clamping area in sequence. When the finger clamp plate rotates to the seed discharge port, the finger clamp lever in the same torsion spring finger clamp slides and engages with the seed clamping area. The first spring body has a first hook at one end and the second spring body has a second hook at the other end. A connecting plate is fixed on the finger clamp plate. Both the first hook and the second hook are hung on the connecting plate and abut against it. A positioning ring is also fixed on the finger clamp arm. A positioning groove is provided on the finger clamp plate. The positioning ring is partially located in the positioning groove. The positioning groove and the positioning ring cooperate to position the finger clamp arm. A pressure ring can also be detachably connected to the finger clamp plate. The finger clamp arm is located between the placement groove and the pressure ring. It also includes a slip ring gap adjustment mechanism, which comprises: A backplate bearing housing for fixed connection with a backplate; the slip ring is sleeved on the backplate bearing housing, the slip ring is circumferentially fixedly connected to the backplate bearing housing, and the slip ring is axially sliding relative to the backplate bearing housing; Studs fixed to the back plate bearing housing; Bolts threadedly connected to the stud; A connector includes a threaded sleeve, a convex ring, and a screw block arranged coaxially. The threaded sleeve is threadedly connected to the stud. One end of the threaded sleeve and the screw block are respectively fixed to the convex ring. The convex ring is located between the threaded sleeve and the screw block. A through hole is provided on the slip ring corresponding to the threaded sleeve. The threaded sleeve passes through the through hole. The diameter of the convex ring is larger than the diameter of the through hole, and the through hole is located between the stud and the convex ring. The convex ring abuts against the slip ring. A knob, comprising a screwing part and a snap-fit ​​part capable of circumferentially engaging with the screw block, the knob being integrally formed, the screwing part having a screwing opening, the screwing opening being polygonal in shape; A first limiting piece is detachably connected to the slip ring by a screw. The first limiting piece has a notch for limiting the rotation of the screwing part, and the screwing part is wholly or partially located in the notch.

2. The torsion spring type finger clamp seed metering device according to claim 1, characterized in that: The housing includes a seed filling shell located on one side of the back plate and a seed discharging shell located on the other side of the back plate. The seed filling shell, the edge of the back plate, and the seed discharging shell are connected by bolts. The seed inlet tube is disposed on the seed filling shell, and the seed outlet is disposed on the seed discharging shell.

3. The torsion spring type finger clamp seed metering device according to claim 1, characterized in that: The seed dispensing chamber is also equipped with a first seed guide wheel that is sleeved on the input shaft and circumferentially connected to the input shaft. The outer side wall of the first seed guide wheel has a plurality of teeth evenly distributed circumferentially for moving the seed guide belt. The seed dispensing chamber is also provided with a second seed guide wheel located above the seed dispensing port and below the first seed guide wheel. The second seed guide wheel is rotatably engaged with a first fixed shaft on the housing via a bearing. The seed guide belt is wound around the first seed guide wheel and the second seed guide wheel.

4. The torsion spring type finger clamp seed metering device according to claim 1, characterized in that: The back plate bearing seat is provided with a slot; the slip ring is provided with a block, and the block engages with the slot. The slip ring gap adjustment mechanism also includes a third spring. A blind hole is provided on the screw block. The third spring is partially disposed in the blind hole. One end of the third spring abuts against the closed end of the blind hole, and the other end abuts against the snap-fit ​​part. The back plate bearing seat is fixedly connected to the back plate of the finger clamp seed metering device, and rotates with the input shaft of the finger clamp seed metering device through the bearing; the screw block is a regular hexagonal prism; the screwing port is triangular.

5. The torsion spring type finger clamp seed metering device according to claim 1, characterized in that: The input shaft extending into the seed filling chamber is provided with an adjusting handwheel, a sleeve, and a fourth spring. The sleeve is a polygonal prism and is threadedly connected to the input shaft. The adjusting handwheel is sleeved on the sleeve and circumferentially engaged with it. The fourth spring is disposed between the adjusting handwheel and the sleeve. One end of the fourth spring abuts against the stepped surface on the sleeve, and the other end abuts against the adjusting handwheel. The end of the adjusting handwheel near the finger clamp is engaged with the finger clamp. The fourth spring is used to ensure that the adjusting handwheel and the finger clamp are in close contact. The input shaft is also provided with a first limiting pin for engaging with the finger clamping disc. The finger clamping disc is located between the limiting pin and the adjusting handwheel, and the first limiting pin and the adjusting handwheel clamp the finger clamping disc.

6. The torsion spring type finger clamp seed metering device according to claim 2, characterized in that: The seed filling shell is also provided with a seed unloading door and a switching mechanism. One end of the seed unloading door is rotatably connected to the seed filling shell, and the other end is provided with a baffle plate. The switching mechanism includes a second fixed shaft, a torsion spring, and a stop rod. The second fixed shaft is fixedly connected to the seed filling shell. The seed filling shell is provided with a plurality of limiting holes distributed circumferentially along the second fixed shaft. The torsion spring is sleeved on the second fixed shaft. One end of the torsion spring abuts against one of the limiting holes, and the other end abuts against the stop rod. One end of the stop rod is rotatably sleeved on the second fixed shaft, and the other end of the stop rod is used to limit the baffle plate.

7. The torsion spring type finger clamp seed metering device according to claim 2, characterized in that: The input shaft is rotatably engaged with the seed metering shell via a bearing, and the input shaft is rotatably engaged with the back plate bearing seat via a bearing.

8. The torsion spring type finger clamp seed metering device according to claim 3, characterized in that: The input shaft is also provided with a second limiting pin for engaging with the first seed guide wheel.

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