Offset three-point type suspension device of plant protection tractor

Abstract

The utility model relates to the technical field of tractors, in particular to an offset three-point type suspension device of a plant protection tractor. Comprising a hanging plate, a left lifting arm and a right lifting arm, the left lifting arm and the right lifting arm are hinged to the hanging plate, the rear end of the left lifting arm and the rear end of the right lifting arm are fixedly connected with a lower cross beam, the lower cross beam is provided with a shaft seat, a middle hanging lug, an offset hanging lug and stand columns, the two stand columns are fixedly connected to the upper face of the lower cross beam, and the upper ends of the stand columns are provided with connecting plates. An upper hanging frame is fixedly connected to the connecting plate; the middle hanging lug and the shaft seat are both located in the middle of the lower cross beam, and the offset hanging lug deviates from the middle of the lower cross beam. According to the hanging device, hanging equipment can be biased leftwards or rightwards according to needs, so that the hanging equipment is closer to crops on one side of a walking route in operation, and the effect of plant protection operation is improved; and the auxiliary oil cylinder arranged on the hanging rack can enlarge the lifting amplitude of the hanging equipment, so that the requirements of more plant protection operations are met.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to an offset three-point suspension device for a plant protection tractor. Background Art

[0002] In agricultural and forestry production, plant protection plays a vital role. A plant protection tractor is a type of plant protection machinery. It can tow a soil treatment machine through a suspension device to achieve field operations such as rotary tillage, turning over the soil, and digging ditches. It can also tow a seeding machine for sowing operations, or tow a harvester for harvesting fruits, vegetables, and crops. The three-point suspension device commonly used in existing tractors is used to connect the tractor with the mounted equipment, such as tillage tools, seeding tools, or harvesters. The three-point suspension system usually consists of two lower connecting rods and an upper connecting rod to form a triangular structure. Through this connection method, the tractor can tow the mounted equipment. The power of the tractor is transmitted to the mounted equipment, enabling it to perform agricultural operations or other work. Chinese Patent 2017216325619 discloses "A tractor electric three-point suspension device", which uses an electric telescopic rod instead of a hydraulic cylinder to drive the lifting arm to rise and fall, solving the problems of easy oil leakage, long transmission distance, and poor control of torque size of the hydraulic suspension device. In order to balance the counterweight and take into account the construction work on both sides of the tractor, the existing three-point suspension devices are all central axis symmetrical structures and are installed on the central axis of the tractor. The towed mounting equipment is located on the central axis of the tractor, and the working distance on both sides of the travel route is equal. In actual plant protection work, such as digging trenches for fertilization, picking fruits and vegetables, spraying pesticides, etc., in order to achieve better results, the tractor and the mounting equipment are required to be as close to the side of the crop as possible. The central mounting equipment cannot be close to the crops on both sides, which affects the effect of plant protection operations. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a three-point offset suspension device for a plant protection tractor which can adjust the position of a mounting device in a horizontal direction. The mounting device can be offset to the left or right as needed to make it closer to crops on one side of the walking route during operation, thereby improving the effect of plant protection operations.

[0004] The technical solution adopted by the utility model to solve the technical problem is:

[0005] The utility model discloses an offset three-point suspension device for a plant protection tractor, comprising a hanging plate, a left lifting arm and a right lifting arm hinged on the hanging plate, the rear ends of the left lifting arm and the right lifting arm are fixedly connected with a lower cross beam, the lower cross beam is provided with an axle seat, a middle hanging ear, an offset hanging ear and a column, two columns are fixedly connected to the upper side of the lower cross beam, the upper ends of the columns are provided with a connecting plate, the connecting plate is fixedly connected to an upper hanging bracket; the middle hanging ear and the axle seat are both located in the middle position of the lower cross beam, and the offset hanging ear deviates from the middle position of the lower cross beam.

[0006] Through this solution, by changing the connection point between the column and the upper bracket, the mounting device can be offset to the left or right as needed, so that it is closer to the crops on one side of the walking route during operation.

[0007] Preferably, the upper bracket includes an upper cross beam fixedly connected to the column, a left hanging arm and a right hanging arm fixedly connected to both ends of the upper cross beam, and a third arm distributed in an isosceles triangle with the left hanging arm and the right hanging arm; the upper cross beam is provided with a central mounting hole and an offset mounting hole for mounting a connecting plate.

[0008] Through this solution, the column can be connected to the central mounting hole or installed in the offset mounting hole, so that the position of the upper bracket can be offset.

[0009] Preferably, a lifting cylinder is hingedly connected to the middle sections of the left lifting arm and the right lifting arm; a transmission shaft is installed in the shaft seat, and a sprocket is installed on the transmission shaft.

[0010] Through this solution, the lifting cylinder can drive the two lifting arms and the lower crossbeam and upper bracket to rise and fall as a whole, and the transmission shaft can transmit the output power of the gearbox backwards.

[0011] Preferably, the third arm is a support rod or an auxiliary oil cylinder, and one end of the third arm is hinged to a central hanging ear or an offset hanging ear.

[0012] Through this solution, the left hanging arm, the right hanging arm and the support rod form a stable triangular support structure, which can be used to stably connect the mounting equipment; when the auxiliary oil cylinder is used instead of the support rod, the mounting equipment can be pushed to rise and fall to a greater extent.

[0013] Preferably, the lower cross beam is a square tube structure, the central hanging ear is fixedly connected to the front side surface of the lower cross beam, and the axle seat is fixedly connected to the lower side surface of the lower cross beam.

[0014] Through this solution, the lower cross beam, the middle hanging ear and the axle seat are firmly connected and will not interfere with each other.

[0015] Preferably, the upper cross beam is a square tube structure, a mounting plate is fixedly connected to the lower side of the upper cross beam, and the central mounting hole and the offset mounting hole are both bolt holes arranged on the mounting plate.

[0016] Through this solution, the upper crossbeam is reasonably stressed, making it convenient to disassemble and assemble the columns.

[0017] Due to the adoption of the above structure, the suspension device can offset the mounting equipment to the left or right as needed, so that it is closer to the crops on one side of the walking route during operation, thereby improving the effect of plant protection operations; setting an auxiliary oil cylinder on the mounting bracket can expand the lifting range of the mounting equipment to meet the needs of more plant protection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model.

[0019] Figure 2 yes Figure 1 Schematic diagram of the assembly structure of the embodiment.

[0020] Figure 3 It is a structural diagram of the usage status.

[0021] Figure 4 It is a schematic diagram of the structure of the biased state of an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to directions away from the geometric center of a specific component.

[0023] like Figure 1 , Figure 2As shown, the three-point suspension device of the plant protection tractor of the utility model can be offset, including a hanging plate 1, a left lifting arm 2 and a right lifting arm 3 hinged on the hanging plate 1, the hanging plate 1 is used to connect the gearbox 99 of the tractor, the middle section of the left lifting arm 2 and the right lifting arm 3 is hinged with a lifting cylinder 21, and the left lifting arm 2 and the right lifting arm 3 can be pushed up and down by the lifting cylinder 21; the rear ends of the left lifting arm 2 and the right lifting arm 3 are fixedly connected with a lower cross beam 4, the lower cross beam 4 is a horizontal square tube structure, and the rear ends of the left lifting arm 2 and the right lifting arm 3 are respectively fixedly connected to the left and right ends of the lower cross beam 4, which can be directly welded or connected by bolts. The lower cross beam 4 is provided with an axle seat 5, a middle hanging ear 6, an offset hanging ear 7 and a column 8, two columns 8 are longitudinally arranged and fixedly connected to the upper part of the lower cross beam 4, and the upper end of the column 8 is provided with a connecting plate 81, and the upper hanging rack is fixedly connected to the connecting plate 81, and the upper hanging rack is driven to be lifted and lowered when the lower cross beam 4 is lifted and lowered. A transmission shaft is installed in the shaft seat 5, and the transmission shaft is connected to the power output shaft of the gearbox 99 through a coupling. A sprocket 51 is installed on the transmission shaft. The power can be transmitted to the mounting equipment on the upper bracket through the chain installed on the sprocket 51, thereby driving the mounting equipment to move.

[0024] The central hanging ear 6 and the axle seat 5 are both located in the middle of the lower cross beam 4, and the offset hanging ear 7 deviates from the middle of the lower cross beam 4 and is arranged on the rear side of the lower cross beam 4. The central hanging ear 6 is fixedly connected to the front side of the lower cross beam 4, and the axle seat 5 is fixedly connected to the lower side of the lower cross beam 4. An offset hanging ear 7 is arranged at each of the left and right ends of the lower cross beam 4.

[0025] The upper hanger includes an upper crossbeam 9 fixedly connected to the column 8, a left hanging arm 91 and a right hanging arm 92 fixedly connected to both ends of the upper crossbeam 9, and a third arm 93 distributed in an isosceles triangle with the left hanging arm 91 and the right hanging arm 92; the left hanging arm 91 and the right hanging arm 92 are protruding parts fixedly welded on the upper crossbeam 9, which can be short square tubes, hanging plates, or connection points with hinge shaft mounting holes, and the ends thereof are provided with hanging points for docking the three-point hanger on the mounting device. The three-point hanger of the mounting device is composed of a left swing arm 911 and a right swing arm 921, both of which are strip-shaped plate structures made of steel plates, and the ends thereof are bent inward to form an isosceles triangle frame structure. The third arm 93 can be a strut or an auxiliary oil cylinder, one end of the third arm 93 is hinged on the middle hanging ear 6 or the offset hanging ear 7, and the other end is connected to the three-point hanger of the mounting device, that is, the common point at the ends of the left swing arm 911 and the right swing arm 921.

[0026] The upper cross beam 9 is a square tube structure, and is provided with a central mounting hole and an offset mounting hole for mounting the connecting plate 81. A mounting plate 94 is fixedly connected to the lower side of the upper cross beam 9, and the central mounting hole and the offset mounting hole are both bolt holes provided on the mounting plate 94.

[0027] like Figure 3 As shown, when in use, the hanging plate 1 is fixedly connected to the rear end of the gearbox 99, and the power output shaft of the gearbox 99 is connected to the transmission shaft through a coupling. The rear end of the transmission shaft is installed in the shaft seat 5 and fixedly installed with a sprocket 51; the mounting device is installed on the upper bracket, and an input sprocket is installed on the power input shaft 52 of the mounting device. The chain transmission mechanism composed of the input sprocket, the sprocket 51 and the chain transmits the power output of the gearbox 99 to the power input shaft 52 of the mounting device, and drives the mounting device to operate. The mounting device is connected to the upper bracket through the left hanging arm 91 and the right hanging arm 92 at both ends of the upper crossbeam 9 and the third arm 93. As shown Figure 1 , Figure 3 As shown, when the upper crossbeam 9 is in the middle position, the connecting plate 81 at the upper end of the column 8 is connected to the upper crossbeam 9 through the middle mounting hole, and the third arm 93 is connected to the middle mounting ear 6. At this time, the mounting device is in the middle position. Figure 4 As shown, when the upper crossbeam 9 is in an offset position, the position of the column 8 remains unchanged, the connecting plate 81 at the upper end of the column 8 is connected to the upper crossbeam 9 through an offset mounting hole, and the third arm 93 is connected to the offset hanging ear 7. At this time, the mounting device is in an offset position. When the third arm 93 is a strut, the lower end of the three-point hanger of the mounting device is connected to the lower crossbeam 4 through the middle hanging ear 6 or the offset hanging ear 7, and the upper end of the three-point hanger of the mounting device is connected to the left hanging arm 91 and the right hanging arm 92 at the left and right ends of the upper crossbeam 9, forming a stable triangular support structure, so that the mounting device can be lifted and lowered with the lifting and lowering of the upper crossbeam 9 and the lower crossbeam 4 under the push of the lifting cylinder 21; when an auxiliary cylinder is used instead of a strut, the three-point hanger of the mounting device can be pushed by the auxiliary cylinder to swing, thereby pushing the mounting device to lift and lower to a greater extent.

[0028] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A three-point offset suspension device for a plant protection tractor, comprising a suspension plate (1), a left lifting arm (2) and a right lifting arm (3) hinged on the suspension plate (1), characterized in that: The rear ends of the left lifting arm (2) and the right lifting arm (3) are fixedly connected to a lower cross beam (4); an axle seat (5), a middle hanging ear (6), an offset hanging ear (7) and a column (8) are arranged on the lower cross beam (4); two columns (8) are fixedly connected to the upper side of the lower cross beam (4); the upper ends of the columns (8) are provided with a connecting plate (81); the connecting plate (81) is fixedly connected to an upper bracket; the middle hanging ear (6) and the axle seat (5) are both located in the middle position of the lower cross beam (4); the offset hanging ear (7) deviates from the middle position of the lower cross beam (4).

2. The offset three-point suspension device for a plant protection tractor according to claim 1, characterized in that: The upper hanging frame comprises an upper crossbeam (9) fixedly connected to a column (8), a left hanging arm (91) and a right hanging arm (92) fixedly connected to two ends of the upper crossbeam (9), and a third arm (93) distributed in an isosceles triangle with the left hanging arm (91) and the right hanging arm (92); a central mounting hole and an offset mounting hole for mounting a connecting plate (81) are provided on the upper crossbeam (9).

3. The offset three-point suspension device for a plant protection tractor according to claim 1 or 2, characterized in that: The middle sections of the left lifting arm (2) and the right lifting arm (3) are hinged with a lifting cylinder (21); a transmission shaft is installed in the shaft seat (5), and a sprocket (51) is installed on the transmission shaft.

4. The offset three-point suspension device for a plant protection tractor according to claim 2, characterized in that: The third arm (93) is a support rod or an auxiliary oil cylinder, and one end of the third arm (93) is hinged on the middle hanging ear (6) or the offset hanging ear (7).

5. The offset three-point suspension device for a plant protection tractor according to claim 1 or 2, characterized in that: The lower cross beam (4) is a square tube structure, the central hanging ear (6) is fixedly connected to the front side of the lower cross beam (4), and the axle seat (5) is fixedly connected to the lower side of the lower cross beam (4).

6. The offset three-point suspension device for a plant protection tractor according to claim 2, characterized in that: The upper cross beam (9) is a square tube structure, and a mounting plate (94) is fixedly connected to the lower side of the upper cross beam (9), and the central mounting hole and the offset mounting hole are both bolt holes arranged on the mounting plate (94).

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