Three-section folding hydraulic hitch for rotary cultivator

Abstract

The utility model discloses a three -section folding rotary cultivator hydraulic hook device, including the suspension assembly of tractor connection, frame assembly and the knife shaft assembly of setting below frame assembly, frame assembly includes mainframe and side edge tool rest, be provided with big oil cylinder and small oil cylinder on mainframe, big oil cylinder is connected side edge tool rest through hinged member, and the telescopic of big oil cylinder drives side edge tool rest to rotate upwards / inwards / downwards / outwards, the front end of small oil cylinder is provided with the hook, and the hook is locked to the end surface of side edge tool rest and the end surface of mainframe and is pasted together on the hook board, be provided with stroke limit valve on mainframe, and stroke limit valve controls the start -stop of small oil cylinder, the utility model discloses novel and reasonable, easy operation can realize both sides section firm pasting together, and the operation reliability of promotion equipment, the working quality with operation convenience.

Description

Technical Field

[0001] This utility model relates to the field of rotary tiller technology, and in particular to a hydraulic hook device for a three-section folding rotary tiller. Background Technology

[0002] In the field of mechanized agricultural tillage, three-section folding rotary tillers are widely used in large-area farmland operations due to their advantages such as flexible and adjustable tillage width and convenient transportation. However, in actual operation, existing three-section folding rotary tillers are affected by factors such as unreasonable structural design and insufficient coordination of components, which not only seriously affect the efficiency and quality of operation, but also significantly increase the equipment maintenance cost and adversely affect subsequent tillage stages. For example, the two side folding sections are prone to "head-up" phenomenon—that is, the front end of the two side folding sections lifts up, forming a large angle with the ground, deviating from the normal tillage posture; this head-up phenomenon will directly lead to serious failure of the core transmission component between the middle section and the two side folding sections—the coupling. On the one hand, when the folded sections on both sides tilt upwards, their transmission shafts deviate from the transmission shaft of the middle section. The coupling, which was originally in a coaxial transmission state, is forced into a "separated" or "semi-separated" state. In the semi-separated state, the driving end and driven end of the coupling cannot achieve stable contact transmission, and severe sliding friction and impact loads will be generated between them. This will not only produce a harsh noise, but also accelerate the wear of the coupling teeth, deformation of the keyway, and even lead to the breakage of the coupling, significantly shortening its service life. According to statistics from actual application, the average replacement cycle of the coupling in three-section folding rotary tillers with this problem is shortened by more than 60% compared with the normal state, and each replacement requires a 2-4 hour downtime, which seriously affects the tillage progress and also leads to a decline in tillage quality. That is, when the folded sections on both sides tilt upwards, their cutter shafts will tilt with the folded sections, resulting in a shallower tillage depth in the two side areas than in the middle area, forming a height difference of "deep in the middle and shallow on both sides", which is not conducive to the growth of sown seeds. Summary of the Invention

[0003] The purpose of this utility model is to provide a hydraulic hook device for a three-section folding rotary tiller with a novel and reasonable structural design, simple operation, and the ability to achieve a firm fit between the two sides, thereby improving the reliability of the equipment, the quality of tillage, and the convenience of operation.

[0004] The purpose of this utility model is achieved as follows: A hydraulic hook device for a three-section folding rotary tiller includes a suspension assembly connected to a tractor, a frame assembly, and a cutter shaft assembly disposed below the frame assembly. The frame assembly includes a main frame and a side cutter holder. A large hydraulic cylinder and a small hydraulic cylinder are disposed on the main frame. The large hydraulic cylinder is connected to the side cutter holder through a hinge. The extension and retraction of the large hydraulic cylinder causes the side cutter holder to rotate upward / inward / downward / outward. A hook is disposed at the front end of the small hydraulic cylinder. The hook is hooked onto a hook plate to lock the end face of the side cutter holder and the end face of the main frame in contact. A stroke limit valve is disposed on the main frame. The stroke limit valve controls the start and stop of the small hydraulic cylinder.

[0005] As a further preferred embodiment of this utility model, the small hydraulic cylinder is connected to the hydraulic cylinder connecting shaft, and the hydraulic cylinder connecting shaft is welded to the frame assembly of the rotary tiller.

[0006] As a further preferred embodiment of this utility model, the hook plate is disposed on the side knife holder.

[0007] As a further preferred embodiment of this utility model, a hook shaft is welded onto the main frame, and a small oil cylinder drives the hook to rotate around the hook shaft as the rotation point.

[0008] As a further preferred embodiment of this utility model, when the side tool holder moves downwards / outwards, the large hydraulic cylinder starts operating first, followed by the small hydraulic cylinder.

[0009] As a further preferred embodiment of this utility model, when the side tool holder moves upward / inward, the small hydraulic cylinder starts running first, and the large hydraulic cylinder starts running later.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a tractor to provide power to control the large and small oil cylinders and the hook device, and works in conjunction with a hydraulic stroke limit valve to ensure that the side blade holder is firmly locked when the rotary tiller is unfolded and working, keeping the main frame and the side blade holder level and connected, which improves the service life of the coupling and the flatness of the tilled land. When the rotary tiller needs to be folded for transportation, it can be quickly unhooked in advance for easy folding, which is convenient and fast, greatly reducing the difficulty of operation and production and maintenance costs, and resulting in better economic benefits. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the technical description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the unfolded structure of a rotary tiller.

[0014] Figure 3 This is a schematic diagram of the folding structure of a rotary tiller.

[0015] Figure 4 A schematic diagram showing the oil flow direction of a rotary tiller.

[0016] Figure 5 This is a schematic diagram of the oil flow direction in a rotary tiller.

[0017] Figure 6 This is a schematic diagram showing the motion relationship between the trigger plate and the stroke limit valve.

[0018] Among them, 1-large hydraulic cylinder, 2-small hydraulic cylinder, 3-stroke limit valve, 4-hook, 5-hook shaft, 6-hook plate, 7-hydraulic cylinder connecting shaft, 8-gearbox assembly, 9-suspension assembly, 10-frame assembly; 1001 main frame, 1002 side tool post, 11-tool shaft assembly, 12-coupling, 13-hinge, 14-trigger plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1-6 As shown, a hydraulic hook device for a three-section folding rotary tiller includes a suspension assembly 9 connected to a tractor, a frame assembly 10, and a cutter shaft assembly 11 disposed below the frame assembly. The frame assembly 10 includes a main frame 1001 and a side cutter holder 1002. A large hydraulic cylinder 1 and a small hydraulic cylinder 2 are disposed on the main frame 1001. The large hydraulic cylinder 1 is connected to the side cutter holder 1002 through a hinge 13. The extension and retraction of the large hydraulic cylinder 1 causes the side cutter holder 1002 to rotate upward / inward / downward / outward. A hook 4 is disposed at the front end of the small hydraulic cylinder 2. The hook 4 is hooked onto a hook plate 6 to lock the end face of the side cutter holder 1002 and the end face of the main frame 1001 in contact. A stroke limit valve 3 is disposed on the main frame 1001, and the stroke limit valve 3 controls the start and stop of the small hydraulic cylinder 2.

[0021] Preferably, the small hydraulic cylinder 2 is connected to the hydraulic cylinder connecting shaft 7, and the hydraulic cylinder connecting shaft 7 is welded to the frame assembly 10 of the rotary tiller.

[0022] Preferably, the hook plate 6 is disposed on the side knife holder 1002.

[0023] Preferably, the hook shaft 5 is welded onto the main frame 1001, and the small oil cylinder 2 drives the hook 4 to rotate around the hook shaft 5 as the rotation point.

[0024] Preferably, when the side tool holder 1002 moves downwards / outwards, the large hydraulic cylinder 1 starts running first, followed by the small hydraulic cylinder 2.

[0025] Preferably, when the side tool holder 1002 moves upward / inward, the small hydraulic cylinder 2 starts running first, and the large hydraulic cylinder 1 starts running later.

[0026] The large hydraulic cylinder 1 and the small hydraulic cylinder 2 move asynchronously and automatically open the structure in sequence. Example

[0027] premise: The tractor and rotary tiller are connected by the suspension assembly 9, which provides power to the gearbox assembly 8; The tractor's multi-way valve controls the flow of hydraulic oil, supplying oil to each cylinder of the rotary tiller.

[0028] The connecting shaft 7 is welded to a steel plate, which is then welded to the frame assembly 10. The hook shaft 5 is welded to the frame assembly 10. One end of the small oil cylinder 2 is connected to the hook 4, and the other end of the small oil cylinder 2 is connected to the oil cylinder connecting shaft 7. When the rotary tiller needs to be deployed (i.e., the side blade holder 1002 moves downward / outward), the large oil cylinder 1 first inputs hydraulic oil, and the piston rod of the large oil cylinder 1 extends outward from the cylinder barrel. The rotary tiller begins to slowly unfold until it is fully unfolded (i.e., the main frame 1001 and the side blade holder 1002 are level). Then, the stroke limit valve 3 is opened, and the oil circuit of the small oil cylinder 2 forms a "passway". The small oil cylinder 2 inputs hydraulic oil, and the piston rod of the small oil cylinder 2 retracts into the cylinder barrel and pulls the hook 4 to hook onto the hook plate 6, locking the two side sections of the rotary tiller (the side sections are the side blade holder 1002, which can be firmly attached to the main frame 1001, and the two are in a horizontal state). Conversely, when the rotary tiller finishes working and needs to be folded for transport, the small cylinder 2 moves first, pushing the hook 4 to disengage from the hook plate 6, and the large cylinder 1 retracts to fold up the rotary tiller.

[0029] The reason why the small oil cylinder 2 can move first is because the small oil cylinder has a small diameter. Once hydraulic oil is input, the small oil cylinder 2 moves immediately, and at the same time the hinge 13 is pulled upward, ultimately realizing the folding and storage of both sides of the rotary tiller. Example

[0030] The stroke limit valve 3 is horizontally mounted on the main frame 1001. The trigger end of the valve core is opposite to the trigger plate 14 on the side tool holder 1002. When the side tool holder 1002 moves downward (i.e., when the side tool holder 1002 moves closer to the main frame 1001), the trigger plate 14 can squeeze the trigger end of the valve core, and the stroke limit valve 3 is opened, forming a "passage" in the oil circuit of the small oil cylinder 2.

[0031] The above description is only a specific embodiment of this utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of the utility model.

Claims

1. A hydraulic hook device for a three-section folding rotary tiller, comprising a suspension assembly (9) connected to a tractor, a frame assembly (10), and a cutter shaft assembly (11) disposed below the frame assembly, characterized in that: The frame assembly (10) includes a main frame (1001) and a side tool holder (1002). A large hydraulic cylinder (1) and a small hydraulic cylinder (2) are provided on the main frame (1001). The large hydraulic cylinder (1) is connected to the side tool holder (1002) through a hinge (13). The extension and retraction of the large hydraulic cylinder (1) causes the side tool holder (1002) to rotate upward / inward / downward / outward. A hook (4) is provided at the front end of the small hydraulic cylinder (2). The hook (4) is hooked onto the hook plate (6) to lock the end face of the side tool holder (1002) and the end face of the main frame (1001) in contact. A stroke limit valve (3) is provided on the main frame (1001). The stroke limit valve (3) controls the start and stop of the small hydraulic cylinder (2).

2. The hydraulic hook device for a three-section folding rotary tiller according to claim 1, characterized in that: The small oil cylinder (2) is connected to the oil cylinder connecting shaft (7), which is welded to the frame assembly (10) of the rotary tiller.

3. The hydraulic hook device for a three-section folding rotary tiller according to claim 1, characterized in that: The hook plate (6) is mounted on the side knife holder (1002).

4. The hydraulic hook device for a three-section folding rotary tiller according to claim 1, characterized in that: The hook shaft (5) is welded onto the main frame (1001), and the small oil cylinder (2) drives the hook (4) to rotate around the hook shaft (5) as the rotation point.

5. The hydraulic hook device for a three-section folding rotary tiller according to claim 1, characterized in that: When the side tool holder (1002) moves downward / outward, the large hydraulic cylinder (1) starts running first, and the small hydraulic cylinder (2) starts running later.

6. The hydraulic hook device for a three-section folding rotary tiller according to claim 1, characterized in that: When the side tool holder (1002) moves upward / inward, the small oil cylinder (2) starts running first, and the large oil cylinder (1) starts running later.

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