Four-bar mechanism for single drill seeder
By adopting a double-body structure and a self-lubricating flange bushing design in the four-bar linkage of the single-unit strip seeder, the problems of jamming and loose bolts in the four-bar linkage mechanism are solved, achieving stable sowing and reduced maintenance.
Patent Information
- Application Number
- CN202520365567.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-04
AI Technical Summary
The four-bar linkage mechanism of existing single-unit row seeders is prone to jamming, and the connecting bolts may loosen or fall off under vibration, causing the seeding unit to swing from side to side, requiring frequent maintenance.
The lower connecting rod and flange bushing feature a double-body structure, which are rotatably connected to the connecting frame via hinged screws. The flange bushing is made of self-lubricating material to achieve self-lubrication and dustproof effects.
This avoids the seeding unit from swaying left and right due to loose bolts, reduces the number of maintenance operations, enhances product reliability, and reduces maintenance needs through self-lubricating materials.
Smart Images
Figure CN223859710U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural machinery and equipment technology, specifically a four-bar linkage mechanism for a single-unit strip seeder. Background Technology
[0002] With the development of agricultural machinery, stand-alone single-unit row seeders have become mainstream. Currently, most stand-alone single-unit row seeders adopt a four-link design, with the four-link hinge being a traditional sleeve + bolt type, which has a simple structure. However, due to the limitations of the row seeder's installation location and working conditions, an O-ring seal needs to be added between the sleeve and the connecting rod to prevent dust from entering and causing structural jamming.
[0003] Due to the harsh working environment of agricultural machinery, the effect of using O-ring seals is far from ideal, causing poor floating of individual seeding units and making sowing impossible. Furthermore, the connecting bolts are prone to loosening or falling off under frequent vibration, causing the seeding units to sway from side to side, resulting in frequent maintenance of the row seeder during operation, which is very inconvenient. Summary of the Invention
[0004] The purpose of this invention is to provide a four-bar linkage mechanism for a single-unit strip seeder, which can solve the technical problems of existing four-bar linkage mechanisms being prone to jamming and requiring frequent maintenance.
[0005] To achieve the above objectives, the present invention adopts the following technical solution.
[0006] A four-bar linkage for a single-unit row seeder includes a front connecting frame, a single-unit connecting frame, an upper connecting rod, and a lower connecting rod. One end of the upper connecting rod is rotatably connected to the front connecting frame, and the other end is rotatably connected to the single-unit connecting frame.
[0007] The lower connecting rod is a double-body structure, consisting of two parallel single rods. The front connecting frame has two sets of mounting ears. One end of each of the two single rods is rotatably connected to the two sets of mounting ears, and the other ends of each of the two single rods are rotatably connected to the single connecting frame from both sides.
[0008] Furthermore, two sets of mounting ears are horizontally symmetrically arranged on the front connecting frame. The mounting ears include inner mounting ears and outer mounting ears. The inner mounting ears and outer mounting ears are rotatably connected to the single rod from both sides of the single rod through the first hinge screw, thereby realizing the rotatable connection between the front connecting frame and the lower connecting rod.
[0009] Furthermore, the side of the two sets of mounting ears that are close to each other is the inner mounting ear, and the side that is far from each other is the outer mounting ear. One end of the first hinge screw is fixedly connected to the inner mounting ear by a thread, and the other end passes through the through hole on the outer mounting ear. The middle part of the first hinge screw is rotatably engaged with the through hole on the single rod.
[0010] Furthermore, a first flange bushing is provided between the single rod and the first hinge screw. The single rod is rotatably engaged with the first hinge screw through the first flange bushing. The flange of the first flange bushing is located between the single rod and the external mounting lug.
[0011] Furthermore, the single-unit connecting frame is rotatably connected to the two single rods by two horizontally symmetrically arranged second hinge screws, thereby realizing the rotatable connection between the single-unit connecting frame and the lower connecting rod.
[0012] Furthermore, two second hinge screws are respectively located on both sides of the single-unit connecting frame. One end of each second hinge screw is fixedly connected to the single-unit connecting frame by a thread, and the other end is rotatably engaged with the through hole on the single rod.
[0013] Furthermore, a second flange bushing is provided between the single rod and the second hinge screw. The single rod is rotatably engaged with the second hinge screw through the second flange bushing. The flange of the second flange bushing is located between the single rod and the single unit connecting frame.
[0014] Furthermore, the two ends of the upper connecting rod are respectively rotatably engaged with the spacers fixed on the front connecting frame and the single connecting frame, thereby realizing the rotatable connection between the upper connecting rod and the front connecting frame and the single connecting frame.
[0015] Furthermore, both spacers are fixed to the front connecting frame and the single-unit connecting frame respectively by bolts and nuts.
[0016] Furthermore, after the bolt passes through the spacer, it passes through the front connecting frame or the single connecting frame and engages with the nut to press the spacer onto the front connecting frame or the single connecting frame.
[0017] By adopting the above technical solution, this utility model has the following beneficial effects:
[0018] 1. In this utility model, the lower connecting rod is hinged to the front connecting frame and the single unit connecting frame by a hinge screw. There is only radial force between the hinge screw and the lower connecting rod, and there is no end face pressure. Therefore, there is no force that would loosen the hinge screw during application, which avoids the problem of the seeding unit swinging left and right due to the loosening of the bolt during use, reduces the number of maintenance during operation, and enhances the reliability of the product.
[0019] 2. The flange bushing is made of self-lubricating material. The lower connecting rod rotates with the hinge screw through the flange bushing, which not only achieves self-lubrication but also has a dustproof effect and a simple structure. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the main structure of this utility model.
[0021] Figure 2 This is a three-dimensional structural diagram of the present invention.
[0022] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure along the AA direction.
[0023] Figure 4 yes Figure 3 Enlarged diagram of point B in the middle.
[0024] Figure 5 yes Figure 3 Enlarged diagram of point C in the middle.
[0025] Figure 6 This is a cross-sectional structural diagram of the hinge joint between the upper connecting rod and the front connecting frame.
[0026] Figure descriptions: 1. Front connecting frame; 11. Mounting ear; 111. Inner mounting ear; 112. Outer mounting ear; 113. First hinge screw; 114. First flange bushing; 2. Single connecting frame; 21. Second hinge screw; 22. Second flange bushing; 3. Upper connecting rod; 31. Spacer; 32. Bolt; 33. Nut; 34. Anti-loosening washer; 4. Lower connecting rod; 41. Single rod. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the features and performance of a four-bar linkage mechanism for a single-unit strip seeder will be further described in detail below with reference to the accompanying drawings and embodiments.
[0028] Please see the appendix Figures 1-6 A four-bar linkage mechanism for a single-unit strip seeder includes a front connecting frame 1, a single-unit connecting frame 2, an upper connecting rod 3, and a lower connecting rod 4.
[0029] One end of the upper connecting rod 3 is rotatably connected to the front connecting frame 1, and the other end is rotatably connected to the single connecting frame 2.
[0030] The two ends of the upper connecting rod 3 are respectively rotatably engaged with the spacer 31 fixed on the front connecting frame 1 and the single connecting frame 2, thereby realizing the rotatable connection between the upper connecting rod 3 and the front connecting frame 1 and the single connecting frame 2.
[0031] Both spacers 31 are fixed to the front connecting frame 1 and the single connecting frame 2 respectively by bolts 32 and nuts 33.
[0032] After the bolt 32 passes through the spacer 31, it passes through the front connecting frame 1 or the single connecting frame 2 and engages with the nut 33 to press the spacer 31 onto the front connecting frame 1 or the single connecting frame 2.
[0033] The lower connecting rod 4 is a double-body structure, consisting of two parallel single rods 41. The front connecting frame 1 is provided with two sets of mounting ears 11. One end of each of the two single rods 41 is rotatably connected to the two sets of mounting ears 11, and the other end of each of the two single rods 41 is rotatably connected to the single connecting frame 2 from both sides.
[0034] Two sets of mounting ears 11 are horizontally symmetrically arranged on the front connecting frame 1. The mounting ears 11 include an inner mounting ear 111 and an outer mounting ear 112. The inner mounting ear 111 and the outer mounting ear 112 are rotatably connected to the single rod 41 from both sides of the single rod 41 through the first hinge screw 113, thereby realizing the rotatable connection between the front connecting frame 1 and the lower connecting rod 4.
[0035] The side of the two sets of mounting ears 11 that are close to each other is the inner mounting ear 111, and the side that is far apart from each other is the outer mounting ear 112. One end of the first hinge screw 113 is fixedly connected to the inner mounting ear 111 by thread, and the other end passes through the through hole on the outer mounting ear 112. The middle part of the first hinge screw 113 is rotatably engaged with the through hole on the single rod 41.
[0036] A first flange bushing 114 is provided between the single rod 41 and the first hinge screw 113. The single rod 41 is rotatably engaged with the first hinge screw 113 through the first flange bushing 114. The flange of the first flange bushing 114 is located between the single rod 41 and the outer mounting ear 112.
[0037] The single connecting frame 2 is rotatably connected to the two single rods 41 by two horizontally symmetrically arranged second hinge screws 21, thereby realizing the rotatable connection between the single connecting frame 2 and the lower connecting rod 4.
[0038] Two second hinge screws 21 are respectively located on both sides of the single connecting frame 2. One end of each second hinge screw 21 is fixedly connected to the single connecting frame 2 by a thread, and the other end is rotatably engaged with the through hole on the single rod 41.
[0039] A second flange bushing 22 is provided between the single rod 41 and the second hinge screw 21. The single rod 41 is rotatably engaged with the second hinge screw 21 through the second flange bushing 22. The flange of the second flange bushing 22 is located between the single rod 41 and the single connecting frame 2.
[0040] In a specific implementation, a four-bar linkage mechanism for a single-unit strip seeder includes a front connecting frame 1, a single-unit connecting frame 2, an upper connecting rod 3, a lower connecting rod 4, and bolts 32, nuts 33, flange bushings, hinge screws, etc., for connecting the above-mentioned main components.
[0041] The connecting frame 1, the single connecting frame 2, the upper connecting rod 3, and the lower connecting rod 4 are hinged to form a parallel four-bar linkage mechanism. The hinge point between the connecting frame 1 and the upper connecting rod 3 is called the front upper hinge point, the hinge point between the single connecting frame 21 and the upper connecting rod 3 is called the rear upper hinge point, the hinge point between the connecting frame 1 and the lower connecting rod 4 is called the front lower hinge point, and the hinge point between the single connecting frame 21 and the lower connecting rod 4 is called the rear lower hinge point.
[0042] like Figure 5 As shown, the front upper hinge point mainly consists of a front connecting frame 1, an upper connecting rod 3, a spacer 31, a bolt 32, a nut 33, and a locking washer 34. The bolt 32 passes through the spacer 31, the front connecting frame 1, the locking washer 34, and the nut 33 in sequence, pressing the spacer 31 against one side of the front connecting frame 1 to prevent it from rotating. The front end hole of the upper connecting rod 3 mates with the spacer 31 to form a hinge, allowing relative rotation during operation.
[0043] The rear upper hinge point mainly consists of a single connecting frame 2, an upper connecting rod 3, a spacer 31, a bolt 32, a nut 33, and an anti-loosening washer 34. The bolt 32 passes through the spacer 31, the single connecting frame 2, the anti-loosening washer 34, and the nut 33 in sequence, pressing the spacer 31 against one side of the single connecting frame 2 to prevent it from rotating. The rear end hole of the upper connecting rod 3 mates with the spacer 31 to form a hinge, allowing relative rotation during operation.
[0044] To prevent the nut 33 from coming loose from the bolt 32, a cotter pin is provided at the end of each bolt 32.
[0045] like Figure 3 and 4 As shown, the lower front hinge point mainly consists of a front connecting frame 1, a lower connecting rod 4, a first hinge screw 113, and a first flanged bushing 114. The lower hinge point of the front connecting frame 1 is divided into left and right sides, each with two mounting ears 11. The first hinge screw 113 is threaded onto the inner mounting ear 111 and supported by the outer mounting ear 112. The inner hole of the first flanged bushing 114 mates with the first hinge screw 113, and the outer surface of the first flanged bushing 114 mates with the fork hole of the lower connecting rod 4. The mating surfaces of the first hinge screw 113 and the first flanged bushing 114 can rotate.
[0046] The first flange bushing 114 is pressed into the front hinge hole of the lower connecting rod 4 from the outside to the inside, without rotation. The outer end face of the lower connecting rod 4 is machined with a recessed end face for engaging with the flange of the first flange bushing 114. The first hinge screw 113 is screwed into the threaded hole of the inner mounting ear 111 from the outside to the inside, and is supported by the outer mounting ear 112.
[0047] At this time, the first hinge screw 113 is firmly fixed to the front connecting frame 1 by the thread tightening force, the supporting force of the first hinge screw 113 and the inner mounting ear 111, and the auxiliary supporting force of the first hinge screw 113 and the outer mounting ear 112. At the same time, the recessed end face machined on the end face of the lower connecting rod 4 forms a mechanical clearance seal with the front connecting frame 1 to prevent dust from entering. The first flange bushing 114 is a self-lubricating bushing and does not require additional lubrication. The inner hole of the first flange bushing 114 mates with the hinge screw 10 to form a hinge.
[0048] like Figure 3 and 5 As shown, the lower rear hinge point mainly consists of a single-unit connecting frame 2, a lower connecting rod 4, a second hinge screw 21, and a second flanged bushing 22. The single-unit connecting frame 2 has threaded holes and countersunk holes on both sides of the lower hinge point. The second hinge screw 21 is fixed in the threaded holes on both sides of the single-unit connecting frame 2 by threads, and the outer cylindrical surface of the second hinge screw 21 mates with the countersunk hole, serving a positioning and support function. The inner hole of the second flanged bushing 22 mates with the second hinge screw 21, and the outer surface of the second flanged bushing 22 mates with the fork hole of the lower connecting rod 4. The mating surfaces of the second hinge screw 21 and the second flanged bushing 22 can rotate.
[0049] The second flange bushing 22 is pressed into the rear hinge hole of the lower connecting rod 4 from the inside out, without rotation. The inner end face of the lower connecting rod 4 is machined with a countersunk end face for engaging with the flange of the second flange bushing 22. The second hinge screw 21 is screwed into the countersunk threaded holes on the left and right sides of the lower hinge point of the single-unit connecting frame 2 from the outside in. The outer cylindrical surface of the second hinge screw 21 engages with the countersunk hole, providing positioning and support.
[0050] At this point, the second hinge screw 21 is firmly fixed to the single-unit connecting frame 2 by the tightening force of the thread and the supporting force of the mating cylindrical surface of the second hinge screw 21. Simultaneously, the countersunk end face machined on the end face of the lower connecting rod 4 forms a mechanical clearance seal with the single-unit connecting frame 2, preventing dust from entering. The second flange bushing 22 is a self-lubricating bushing, requiring no additional lubrication. The inner hole of the second flange bushing 22 mates with the second hinge screw 21 to form a hinge.
[0051] It should be noted that the parts not described in detail in this solution are all prior art. The above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A four-bar linkage for a single-unit row seeder, comprising a front connecting frame (1), a single-unit connecting frame (2), an upper connecting rod (3), and a lower connecting rod (4), wherein one end of the upper connecting rod (3) is rotatably connected to the front connecting frame (1), and the other end is rotatably connected to the single-unit connecting frame (2), characterized in that: The lower connecting rod (4) is a double-body structure, consisting of two parallel single rods (41). The front connecting frame (1) is provided with two sets of mounting ears (11). One end of each of the two single rods (41) is rotatably connected to the two sets of mounting ears (11), and the other end of each of the two single rods (41) is rotatably connected to the single connecting frame (2) from both sides.
2. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 1, characterized in that: Two sets of mounting ears (11) are horizontally symmetrically arranged on the front connecting frame (1). The mounting ears (11) include an inner mounting ear (111) and an outer mounting ear (112). The inner mounting ear (111) and the outer mounting ear (112) are respectively rotatably connected to the single rod (41) from both sides through the first hinge screw (113), thereby realizing the rotatable connection between the front connecting frame (1) and the lower connecting rod (4).
3. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 2, characterized in that: The side of the two sets of mounting ears (11) that are close to each other is the inner mounting ear (111), and the side that is far apart from each other is the outer mounting ear (112). One end of the first hinge screw (113) is fixedly connected to the inner mounting ear (111) by thread, and the other end passes through the through hole on the outer mounting ear (112). The middle part of the first hinge screw (113) is rotatably engaged with the through hole on the single rod (41).
4. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 3, characterized in that: A first flange bushing (114) is provided between the single rod (41) and the first hinge screw (113). The single rod (41) is rotatably engaged with the first hinge screw (113) through the first flange bushing (114). The flange of the first flange bushing (114) is located between the single rod (41) and the external mounting ear (112).
5. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 1, characterized in that: The single connecting frame (2) is rotatably connected to the two single rods (41) by two horizontally symmetrically arranged second hinge screws (21), thereby realizing the rotatable connection between the single connecting frame (2) and the lower connecting rod (4).
6. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 5, characterized in that: Two second hinge screws (21) are respectively located on both sides of the single connecting frame (2). One end of each second hinge screw (21) is fixedly connected to the single connecting frame (2) by a thread, and the other end is rotatably engaged with the through hole on the single rod (41).
7. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 6, characterized in that: A second flange bushing (22) is provided between the single rod (41) and the second hinge screw (21). The single rod (41) is rotatably engaged with the second hinge screw (21) through the second flange bushing (22). The flange of the second flange bushing (22) is located between the single rod (41) and the single connecting frame (2).
8. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 1, characterized in that: The two ends of the upper connecting rod (3) are respectively rotated and engaged with the spacers (31) fixed on the front connecting frame (1) and the single connecting frame (2), thereby realizing the rotational connection between the upper connecting rod (3) and the front connecting frame (1) and the single connecting frame (2).
9. The four-bar linkage mechanism for a single-unit strip seeder as described in claim 8, characterized in that: Both spacers (31) are fixed on the front connecting frame (1) and the single connecting frame (2) respectively by bolts (32) and nuts (33).
10. A four-bar linkage mechanism for a single-unit strip seeder as described in claim 9, characterized in that: After the bolt (32) passes through the spacer (31), it passes through the front connecting frame (1) or the single connecting frame (2) and engages with the nut (33) to press the spacer (31) onto the front connecting frame (1) or the single connecting frame (2).