Full-adaptive hitching device of tractor

Abstract

The utility model provides a fully-adaptive hitching device for a tractor, which belongs to the field of agricultural machinery and comprises an upper hitching piece, a lower hitching piece, a lug seat and a lower pull rod, the upper hitching piece and the lower hitching piece are vertically and correspondingly fixed on a farm tool, the lug seat is connected with the upper hitching piece and can horizontally move based on the upper hitching piece, and the lower pull rod is connected with the lower hitching piece. According to the scheme, a lifting rod and an upper pull rod used by a traditional three-point suspension device are abandoned, besides a lower pull rod is reserved, the hanging device is creatively and directly connected with a lifting arm of a tractor, spherical hinge pin shaft connection is changed into spherical hinge bolt connection, and therefore three-point suspension is changed into four-point suspension, and the hanging device is simple in structure and convenient to use. The balance of installation is greatly improved, and normal operation can be achieved under the conditions that the mass of an agricultural implement is heavy, the size deviation of the connecting rod is large, balance weights on the two sides are unequal or stress on the two sides is unequal.

Description

Technical Field

[0001] The utility model belongs to the field of agricultural machinery, and particularly relates to a fully adaptable hitch device for a tractor. Background Art

[0002] Outward-driven agricultural machinery with a tractor as the power source and operating platform is widely popularized. Most of such farm implements are connected to the tractor by a three-point hitch device. According to the national standard GB / T 1593-2015 "Agricultural wheeled tractors - Rear-mounted three-point hitch devices - Classes 0, 1N, 1, 2N, 2, 3N, 3, 4N and 4" and other relevant standards for three-point hitches, the basic characteristics of the so-called three-point hitch include: connecting the tractor and the implement with 5 connecting rods, the tractor having 3 hinge points, the implement having 3 suspension points, and lifting and lowering operations being performed through the lift arms of the tractor. Currently, some solutions in the field of agricultural machinery claim to have a four-point hitch or even a five-point hitch. However, after comparing with the relevant standards for three-point hitches, it can be found that the so-called four-point hitch or even five-point hitch is a misnomer, and its structure still belongs to a three-point hitch device. In addition, there are also farm implements that use a four-point rigid hitch according to the national standard GB / T17125-1997 "Technical specifications for four-point rigid hitch devices for agricultural tractors and implements", but they have basically stopped being used due to many deficiencies.

[0003] There is a disclosed upper pull rod mounting seat, upper pull rod mounting assembly, three-point hitch device and tractor (patent application number: CN202221341232.X), which includes a base plate (4) for connecting to the tractor body, a first side plate (2) and a second side plate (5) respectively connected to the base plate and arranged opposite to each other, and a fixing pin (7) connected between the first side plate and the second side plate. Among them, the first side plate and the second side plate are respectively formed with chutes (14) opposite to each other for connecting the upper pull rod (1), so as to allow the upper pull rod (1) to slide between the working position and the fixed position along the chute (14), and be fixed by cooperating with the fixing pin (7) when sliding to the fixed position.

[0004] This solution uses a three-point hitch device to connect to the tractor. The three-point hitch device has the following defects: the farm implement shakes and wags severely, affecting the operation effect; when the farm implement is subjected to a large force during operation, the farm implement will shift and avoid, resulting in efficiency loss and ineffective operation; in cases where the farm implement is heavy, the connecting rod size deviation is large, the weights on both sides are unequal or the forces on both sides are uneven, the farm implement is prone to losing balance and cannot operate normally; there are huge safety hazards when using a three-point hitch device alone. Therefore, as the factory standard configuration of tractor manufacturers, limit chains or limit rods will be installed on both sides of the lower pull rod; there is a situation where the type of the lower pull rod does not match the farm implement and cannot be universally installed. Content of the Utility Model

[0005] The present application provides a fully adaptable hitch device for a tractor, aiming to solve the technical problems existing in the above three-point hitch device.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

[0007] A fully adaptable hitch device for a tractor includes an upper hitch member, a lower hitch member, an ear seat and a lower pull rod. The upper hitch member and the lower hitch member are fixedly arranged corresponding to each other up and down on an agricultural implement. The ear seat is connected to the upper hitch member and can horizontally move based on the upper hitch member. The lower pull rod is connected to the lower hitch member.

[0008] Preferably, the ear seat includes an ear plate and a seat plate, the ear plate and the seat plate are perpendicular to each other, and the ear plate is provided with a first hitch hole.

[0009] Preferably, the upper hitch member is provided with a first fixing hole, the seat plate is provided with a first sliding groove, the first sliding groove is perpendicular to the ear plate, the ear seat can horizontally move along the first sliding groove, and the upper hitch member and the ear seat are respectively fixed and connected by using their first fixing hole and first sliding groove and through bolts and nuts.

[0010] Preferably, the upper hitch member is provided with a second sliding groove, the seat plate is provided with a second fixing hole, the second sliding groove is horizontally distributed, the ear seat can horizontally move along the second sliding groove, and the upper hitch member and the ear seat are respectively fixed and connected by using their second sliding groove and second fixing hole and through bolts and nuts.

[0011] Preferably, the ear plate is equipped with a first reinforcing plate and a first reinforcing bushing, the first reinforcing plate is provided with a second hitch hole, and the first reinforcing bushing is located between the first hitch hole and the second hitch hole and is fixed and connected through bolts and nuts.

[0012] Preferably, the lower hitch member is provided with a third hitch hole, and the lower hitch member is connected to the lower pull rod through bolts and nuts by using its third hitch hole.

[0013] Preferably, the lower hitch member is equipped with a second reinforcing plate and a second reinforcing bushing, the second reinforcing plate is provided with a fourth hitch hole, and the second reinforcing bushing is located between the third hitch hole and the fourth hitch hole and is fixed and connected through bolts and nuts.

[0014] Preferably, the lower hitch member is equipped with a heightening bushing, and the heightening bushing is located between the third hitch hole and the lower pull rod and is connected through bolts and nuts.

[0015] Preferably, the lower hitch member is inclined in an outer V shape with one side inclination angle ≥5° based on the end adjacent to the tractor, and the outer width of the end of the lower hitch member adjacent to the tractor ≤386 mm.

[0016] Preferably, it further includes a suspension seat, the suspension seat is fixed at the upper center of the agricultural implement, and the suspension seat is provided with a suspension hole.

[0017] The utility model has the following beneficial effects:

[0018] (1) The hanging device of this solution abandons the lifting rod and the upper pull rod used in the traditional three-point hanging device. Except for retaining the lower pull rod, it creatively connects the hanging device directly to the lifting arm of the tractor, thus changing the three-point suspension into a four-point hanging, greatly improving the balance of installation. Even in situations such as heavy agricultural implements, large deviations in the connecting rod dimensions, unequal weights on both sides, or uneven forces on both sides, normal operation can still be carried out;

[0019] (2) The lifting arm of the tractor is strong and stable, providing a reliable guarantee for the overall connection rigidity of the hanging device, and safe operation can be carried out without adding other auxiliary strengthening mechanisms;

[0020] (3) This solution changes the ball hinge pin shaft connection to a ball hinge bolt connection, significantly reducing the connection gap, reducing the shaking and tail-swing of the agricultural implement, and further improving the operation efficiency;

[0021] (4) While retaining the original characteristics such as simple disassembly and assembly and free lifting, the hanging device of this solution also has the advantages of multiple lower pull rod mounting holes, various lifting arm mounting spacings, heights and types, adjustable lifting range and elevation angle of the agricultural implement, etc., and can be adapted and universally installed with tractors known in the current market. In addition, the frame hanging device of this solution can also be compatible with traditional three-point hanging devices. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the four-point two-rod hanging of the hanging device in the utility model;

[0023] Figure 2 is a schematic structural diagram of the four-point six-rod hanging of the hanging device in the utility model;

[0024] Figure 3 is a schematic structural diagram of the three-point five-rod suspension of the hanging device in the utility model;

[0025] Figure 4 is a schematic structural diagram of the upper hanging part with a second chute and the seat plate with a second fixing hole in the utility model;

[0026] Figure 5 is a schematic structural diagram of the ear seat corresponding to the seat plate with a first chute in the utility model;

[0027] Figure 6 is a schematic structural diagram of the ear plate equipped with a first reinforcing plate and a first reinforcing bushing in the utility model;

[0028] Figure 7 is a schematic structural diagram of the lower hanging part equipped with a second reinforcing plate and a second reinforcing bushing in the utility model;

[0029] Figure 8 This is a schematic diagram of the structure with an increased-height bushing provided for the lower hanging member in the present utility model.

[0030] Among them, 1 - upper hanging member, 2 - lower hanging member, 3 - ear seat, 4 - lower pull rod, 5 - agricultural implement, 6 - tractor, 7 - lifting arm, 8 - lower hinge point, 9 - ear plate, 10 - seat plate, 11 - first hanging hole, 12 - first fixing hole, 13 - first sliding groove, 14 - second sliding groove, 15 - second fixing hole, 16 - first reinforcement plate, 17 - first reinforcement bushing, 18 - second hanging hole, 19 - third hanging hole, 20 - second reinforcement plate, 21 - second reinforcement bushing, 22 - fourth hanging hole, 23 - increased-height bushing, 24 - suspension seat, 25 - suspension hole, 26 - spherical hinge, 27 - upper pull rod, 28 - lifting rod, 29 - L-shaped ear seat, 30 - T-shaped ear seat, 31 - C-shaped ear seat, 32 - double-fork type lifting arm, 33 - spherical hinge type lifting arm, 34 - upper hinge point. Specific embodiments

[0031] Embodiment 1

[0032] As Figure 1 and Figure 5 shown, a fully adaptable hitch device for a tractor includes an upper hanging member 1, a lower hanging member 2, an ear seat 3 and a lower pull rod 4. The upper hanging member 1 and the lower hanging member 2 are fixedly arranged corresponding to each other on the agricultural implement 5. The ear seat 3 is connected to the upper hanging member 1 and can move horizontally based on the upper hanging member 1. The lower pull rod 4 is connected to the lower hanging member 2.

[0033] The connection can be made by combining bolts and nuts, or other connection methods can also be used.

[0034] The upper hanging member 1 and the lower hanging member 2 can be made of steel plates, steel pipes or several U-shaped connection seats according to actual situations to improve strength, reduce weight and lower costs.

[0035] In this embodiment, the connection with the tractor 6 is a four-point two-bar hitch (relative to the tractor 6). The lower hanging member 2 and the lower pull rod 4 are respectively rotationally connected by using their third hanging holes 19 and the spherical hinge 26 through bolts and nuts. The other end of the lower pull rod 4 is ball-hinge pin-connected to the lower hinge point 8 of the tractor 6. The ear seat 3 is connected to the lifting arm 7 by using its first hanging hole 11, thereby realizing the four-point two-bar hitch of the agricultural implement 5 and the tractor 6. This hitch method abandons the upper pull rod 27 and the lifting rod 28. The number of connecting rods is only 2, and the number of connection points is 6, among which 2 are ball-hinge pin connections. The fitting clearance is small, and the overall connection rigidity is good. The suspension points of this hitch method are 4, and 2 of them are the lifting arms 7, so it has excellent stability.

[0036] The ear seat 3 includes an ear plate 9 and a seat plate 10. The ear plate 9 and the seat plate 10 are perpendicular to each other, and the ear plate 9 is provided with a first hanging hole 11.

[0037] The lift arms 7 of the tractor 6 are divided into a ball-joint type lift arm 33 and a double-fork type lift arm 32. The ear seat 3 is rotatably connected to the ball-joint type lift 33 through bolts and nuts by using its first hitch hole 11, and the ear seat 3 is movably connected to the double-fork type lift arm 32 through a pin shaft by using its first hitch hole 11.

[0038] The ear plate 9 adopts a dual-position design. Different first hitch holes 11 can be selected to connect the ear seat 3 with the lift arm 7 to realize the up and down movement of the hitch position, and different installation directions can be selected to connect the ear seat 3 with the upper hitch member 1 to realize the upward or downward offset of the position of the first hitch hole 11. Therefore, it can adapt to different installation heights of the lift arm 7 and can adjust the lifting range of the farm implement 5.

[0039] The ear seat 3 can be of L-shaped, T-shaped or C-shaped. The L-shaped ear seat 29 means that the ear plate 9 is located outside the seat plate 10, the T-shaped ear seat 30 means that the ear plate 9 is located in the middle of the seat plate 10, and the C-shaped ear seat 31 means that two ear plates 9 are respectively located on both sides of the seat plate 10. The L-shaped ear seat 29 can select the inner or outer side of the ear plate 9 to be connected with the lift arm 7, and the C-shaped ear seat 31 can select different ear plates 9 to be connected with the lift arm 7. Therefore, it can further expand the adaptability to the installation spacing of the lift arm 7.

[0040] The upper hitch member 1 is provided with a first fixing hole 12, and the seat plate 10 is provided with a first sliding groove 13. The first sliding groove 13 is perpendicular to the ear plate 9. The ear seat 3 can move horizontally along the first sliding groove 13. The upper hitch member 1 and the ear seat 3 are fixedly connected through bolts and nuts by using their first fixing hole 12 and the first sliding groove 13 respectively.

[0041] The upper hitch member 1 is provided with a plurality of first fixing holes 12. Different first fixing holes 12 can be selected to connect the ear seat 3 with the upper hitch member 1 to realize the left and right movement and up and down movement of the position of the first hitch hole 11. Therefore, it can adapt to different installation spacings and heights of the lift arm 7 and can adjust the lifting range of the farm implement 5.

[0042] The positions of the first fixing hole 12 and the first sliding groove 13 are matched and can be installed universally. After the ear seat 3 is installed on the upper hitch member 1, it can move within the length range of the first sliding groove 13. Therefore, it can adapt to different installation spacings of the lift arm 7.

[0043] The lower hitch member 2 is provided with a third hitch hole 19. The lower hitch member 2 is connected to the lower pull rod 4 through bolts and nuts by using its third hitch hole 19.

[0044] The lower hitch member 2 is provided with a plurality of third hitch holes 19. The lower pull rod 4 can select different third hitch holes 19 for connection. Therefore, it can adapt to different lengths of the lower pull rod 4 and can adjust the working elevation angle.

[0045] The lower attachment 2 is inclined in an outward-facing manner with respect to one end thereof adjacent to the tractor 6 as a reference, and the single-side inclination angle is ≥5°, and the outer width of the end of the lower attachment 2 adjacent to the tractor 6 is ≤386 mm.

[0046] According to relevant standards for tractors, the outer width of the lower attachment 2 is ≤386 mm, and the lower attachment 2 is tilted in an outward-facing manner, which can prevent the farm implement 5 from colliding and interfering with the lower pull rod 4 during installation and operation.

[0047] Example 2

[0048] The difference between this embodiment and embodiment 1 is that: Figure 2 As shown, the ear seat 3 and one end of the upper pull rod 27 are rotatably connected using the first hanging hole 11 and the ball joint 26 thereof through bolts and nuts, the other end of the upper pull rod 27 is connected to the lifting arm 7 via a ball joint pin, one end of the lifting rod 28 is rotatably connected to the lower pull rod 4, and the other end of the lifting rod 28 is connected to the lifting arm 7 via a ball joint pin, thereby realizing the four-point six-rod hanging of the agricultural implement 5 and the tractor 6.

[0049] This type of hanging method still needs to use the lifting rod 28 and the upper pull rod 27. The number of connecting rods is 6 and the number of connection points is 10, of which 4 are ball joint pin shaft connections. The matching clearance is large and the overall connection rigidity is similar to that of the traditional three-point hanging device. This type of hanging method has 4 hanging points, so the stability is improved compared with the traditional three-point hanging device.

[0050] Example 3

[0051] The difference between this embodiment and embodiment 1 is that: Figure 3 As shown, the agricultural implement 5 further includes a suspension seat 24 , which is fixed to the upper center of the agricultural implement 5 , and the suspension seat 24 is provided with a suspension hole 25 .

[0052] The suspension seat 24 is a U-shaped suspension seat. The suspension seat 24 uses its suspension hole 25 to connect one end of the upper pull rod 27 with a ball hinge pin, and the other end of the upper pull rod 27 is connected to the upper hinge point 34 of the tractor 6 with a ball hinge pin. One end of the lifting rod 28 is rotatably connected to the lower pull rod 4, and the other end of the lifting rod 28 is connected to the lifting arm 7 with a ball hinge pin, thereby realizing the three-point five-bar suspension of the agricultural implement 5 and the tractor 6. This suspension method still needs to use the lifting rod 28 and the upper pull rod 27, the number of connecting rods is 5, and the number of connection points is 10, of which 6 are connected with ball hinge pins. The matching clearance is large and the overall connection rigidity is poor; this suspension method has 3 suspension points, so the stability is poor. Here it is only to illustrate that the present hooking device can also be applied to the three-point suspension device.

[0053] Example 4

[0054] The difference between this embodiment and the above embodiment is that: Figure 4As shown, the upper hanging member 1 is provided with a second sliding groove 14, and the seat plate 10 is provided with a second fixing hole 15. The second sliding groove 14 is horizontally distributed. The ear seat 3 can move horizontally along the second sliding groove 14. The upper hanging member 1 and the ear seat 3 are respectively fixed and connected by bolts and nuts using their second sliding groove 14 and second fixing hole 15.

[0055] As long as the relative position between the ear seat 3 and the upper hanging member 1 can be adjusted, the sliding groove and the fixing hole can be arranged on either device.

[0056] Embodiment 5

[0057] The difference between this embodiment and the above embodiments is that: as Figure 6 shown, the ear plate 9 is equipped with a first reinforcing plate 16 and a first reinforcing bushing 17. The first reinforcing plate 16 is provided with a second hanging hole 18. The first reinforcing bushing 17 is located between the first hanging hole 11 and the second hanging hole 18 and is fixed and connected by bolts and nuts.

[0058] Figure 6 On the right in [description] is to add the first reinforcing plate 16 and the first reinforcing bushing 17, and change the connection between the ear seat 3 and the ball-joint type lifting arm 7 from a single-bolt connection to a double-bolt reinforcement. Therefore, it can reduce the displacement and avoidance of the farm implement 5 and reduce the load at the connection part, and helps to further improve the overall connection rigidity.

[0059] Embodiment 6

[0060] The difference between this embodiment and the above embodiments is that: as Figure 7 shown, the lower hanging member 2 is equipped with a second reinforcing plate 20 and a second reinforcing bushing 21. The second reinforcing plate 20 is provided with a fourth hanging hole 22. The second reinforcing bushing 21 is located between the third hanging hole 19 and the fourth hanging hole 22 and is fixed and connected by bolts and nuts.

[0061] By adding the second reinforcing plate 20 and the second reinforcing bushing 21 and changing the connection between the lower pull rod 4 and the lower hanging member 2 from a single-bolt connection to a double-bolt reinforcement, it can reduce the displacement and avoidance of the farm implement 5 and reduce the load at the connection part, and helps to further improve the overall connection rigidity.

[0062] Embodiment 7

[0063] The difference between this embodiment and the above embodiments is that: as Figure 8 shown, the lower hanging member 2 is equipped with a heightening bushing 23. The heightening bushing 23 is located between the third hanging hole 19 and the lower pull rod 4 and is connected by bolts and nuts.

[0064] Since the specifications of the tractor 6 are different, in order to be applicable to more specifications, by adding the heightening bushing 23, it can avoid the collision and interference between the lower hanging member 2 and the lower pull rod 4 during installation and operation.

[0065] The above are only specific embodiments of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A fully adaptable hitch device for a tractor, characterized in that, It includes an upper hitching part (1), a lower hitching part (2), an ear seat (3) and a lower pull rod (4). The upper hitching part (1) and the lower hitching part (2) are fixedly arranged corresponding to each other up and down on an agricultural implement (5). The ear seat (3) is connected to the upper hitching part (1) and can horizontally move based on the upper hitching part (1). The lower pull rod (4) is connected to the lower hitching part (2). The ear seat (3) includes an ear plate (9) and a seat plate (10), and the ear plate (9) is provided with a first hitching hole (11). The upper hitching part (1) is provided with a first fixing hole (12), and the seat plate (10) is provided with a first sliding groove (13). The upper hitching part (1) and the ear seat (3) are fixedly connected to each other by using their first fixing hole (12) and first sliding groove (13) respectively and through bolts and nuts. The upper hitching part (1) is provided with a second sliding groove (14), and the seat plate (10) is provided with a second fixing hole (15). The upper hitching part (1) and the ear seat (3) are fixedly connected to each other by using their second sliding groove (14) and second fixing hole (15) respectively and through bolts and nuts. The lower hitching part (2) is provided with a third hitching hole (19), and the lower hitching part (2) is connected to the lower pull rod (4) by using its third hitching hole (19) and through bolts and nuts.

2. The all - adapted hitch device for a tractor according to claim 1, characterized in that, The ear plate (9) and the seat plate (10) are perpendicular to each other.

3. A full - adaptation hitch device for a tractor according to claim 1, characterized in that, The first sliding groove (13) is perpendicular to the ear plate (9), and the ear seat (3) can horizontally move along the first sliding groove (13).

4. A full-adaptation hitch device for a tractor according to claim 1, characterized in that, The second sliding groove (14) is horizontally distributed, and the ear seat (3) can horizontally move along the second sliding groove (14).

5. A full-adaptation hitch device for a tractor according to claim 1, characterized in that, The ear plate (9) is equipped with a first reinforcing plate (16) and a first reinforcing bushing (17). The first reinforcing plate (16) is provided with a second hitching hole (18). The first reinforcing bushing (17) is located between the first hitching hole (11) and the second hitching hole (18) and is fixedly connected through bolts and nuts.

6. The full-fit hitch device for a tractor according to claim 1, characterized in that, The lower hitching part (2) is equipped with a second reinforcing plate (20) and a second reinforcing bushing (21). The second reinforcing plate (20) is provided with a fourth hitching hole (22). The second reinforcing bushing (21) is located between the third hitching hole (19) and the fourth hitching hole (22) and is fixedly connected through bolts and nuts.

7. The full-fit hitch device for a tractor according to claim 1, characterized in that, The lower hitching part (2) is equipped with a heightening bushing (23). The heightening bushing (23) is located between the third hitching hole (19) and the lower pull rod (4) and is connected through bolts and nuts.

8. A full-fit hitch device for a tractor according to claim 1, characterized in that, One end of the lower hitching part (2) adjacent to a tractor (6) is inclined outwards in a V shape with a single-side inclination angle ≥ 5°, and the outer width of the end of the lower hitching part (2) adjacent to the tractor (6) ≤ 386 mm.

9. A full-adaptation hitch device for a tractor according to claim 1, characterized in that, It further includes a suspension seat (24). The suspension seat (24) is fixed at the upper central part of the agricultural implement (5), and the suspension seat (24) is provided with a suspension hole (25).

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