Buffer device for the extension arm of weeding equipment

Abstract

The application discloses a buffer device of a weeding equipment stretching arm and relates to the field of weeding machines.The buffer device comprises a stretching arm and a hydraulic system.The stretching arm comprises a mounting base provided with a five-link structure and a half-moon connecting plate, one end of the connecting plate is connected with the half-moon connecting plate, the other end of the connecting plate is connected with the five-link structure, one end of the five-link structure is connected with one end of a rear moving buffer arm, the other end of the rear moving buffer arm is connected with one end of a weeding head, the hydraulic system comprises a rear moving arm buffer oil cylinder mounted on the five-link structure, an arm side turning oil cylinder mounted on the mounting base, an arm stretching oil cylinder mounted in the five-link structure and a weeding head turning oil cylinder mounted on the rear moving buffer arm.The application is used to solve the problem that the weeding equipment with the stretching arm and the weeding head capable of performing horizontal and vertical weeding operations is damaged by impact load when the weeding equipment is used to perform weeding operations on the ground pits, high and low relief conditions, and the weeding head is easily in rigid contact with the protruding part of the ground.

Description

Technical Field

[0001] This invention relates to the field of weeding machinery manufacturing technology, and in particular to a hydraulic buffer structure for absorbing the impact force generated by the extension arm of a weeder when weeding on uneven ground. Background Technology

[0002] Weeding equipment is an essential and efficient tool for weeding operations in various locations such as municipal gardens, sanitation facilities, airports, and golf courses. Most weeding equipment has its weeding head mounted on a fixed arm, meaning the head's height above the ground is fixed and cannot be too low. When weeding operations require a lower weeding height, fixed-arm weeding equipment cannot effectively perform the task, and it is also susceptible to damage from impacts and collisions with the terrain at low elevations. Therefore, existing weeding equipment suffers from an inability to handle complex, uneven terrain and is prone to damage to its extension arm due to changes in terrain. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a buffer device for the extension arm of a weeding device. It can solve the problem that when a weeding device with an extension arm and a weeding head that can perform weeding operations in both horizontal and vertical directions is used to weed in uneven or undulating ground conditions, the impact load caused by the weeding head rigidly contacting the protruding parts of the ground can damage the extension arm of the weeding device.

[0004] To solve the above problems, the technical solution of the present invention is: the buffer device of the extension arm of this weeding equipment includes an extension arm and a hydraulic buffer system that are hinged to each other; the extension arm includes a mounting base, a crescent connecting plate, a connecting plate, a five-bar linkage, a rear moving buffer arm, a weeding head flipping shaft assembly, and a weeding head;

[0005] The mounting base is installed at the front of the power vehicle, the crescent connecting plate is installed on one side of the mounting base, the crescent connecting plate is connected to the connecting plate and one end of the arm tilting cylinder, the other end of the connecting plate is connected to one end of the five-link structure, one end of the five-link structure is connected to one end of the mounting base, the other end of the five-link structure is connected to one end of the rear moving buffer arm, the other end of the rear moving buffer arm is connected to the weeding head flipping shaft assembly in a shaft hole fit manner, and the shaft end of the weeding head flipping shaft assembly is rigidly connected to the housing of the weeding head;

[0006] The hydraulic buffer system includes a rear boom buffer cylinder, an accumulator assembly, a boom tilting cylinder, a one-way relief valve, a boom extension cylinder, a weeding head tilting cylinder, an electro-hydraulic lock, a two-way hydraulic check valve, and a three-position four-way proportional directional valve.

[0007] The arm tilting cylinder is mounted on the mounting base, with one end connected to the crescent-shaped connecting plate; the arm extension cylinder is mounted inside the five-bar linkage, with both ends connected to the two intersecting links of the five-bar linkage; the rear boom buffer cylinder is mounted on the five-bar linkage with one end and connected to the rear boom buffer with the other end; the weeding head tilting cylinder is mounted on the rear boom buffer with one end connected to the weeding head tilting shaft assembly.

[0008] A more specific solution to the above technical solution is that the weeding head tilting cylinder is connected to the return oil line through an electro-hydraulic lock on both the rod-side and rodless-side pipelines.

[0009] Further: The overflow pressure of the one-way relief valve on the rod chamber oil pipe of the connecting arm tilting cylinder is 7MPa to 8MPa.

[0010] Further: During weeding, as the arm tilting cylinder retracts, the arm extension cylinder extends, and the extension arm tilts to the right and extends outwards. Simultaneously, the accumulator assembly begins to charge pressurized oil until the weeding head contacts the ground with a force of less than 250N. When the weeding head passes over uneven ground, it experiences impact forces in both the rearward and upward directions due to terrain obstruction. At this time, the rear-moving buffer arm is forced to move backward, thereby compressing the rear-moving arm buffer cylinder. The hydraulic oil in the rear-moving arm buffer cylinder is then pumped to the arm tilting cylinder through hydraulic pipes. The rodless chamber pushes out the boom tilting cylinder and raises the entire extension boom. When raised, the hydraulic oil in the rod chamber of the boom tilting cylinder overflows to the return oil pipe through the one-way overflow valve. The one-way valve can prevent the boom tilting cylinder from being pushed out to prevent the weeding head from jumping due to the sudden rise of the ground. Through the mutual linkage between the rear boom buffer cylinder and the boom tilting cylinder, when the weeding head is obstructed by the terrain, the extension boom pulls the weeding head backward and lifts it upward at the same time, so that the weeding head can keep close to the ground and carry out weeding work through the uneven terrain.

[0011] Further details: the accumulator assembly has the model number 140-1315-143-641; the one-way relief valve has the model number BR2011B; the two-way hydraulic check valve has the model number 2S08-K8L; and the three-position four-way proportional directional valve has the model number L8581E21ZOC072000.

[0012] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0013] This invention can effectively solve the problem of buffering the force of terrain obstacles in weeding equipment and protect the extension arm of the weeding equipment from damage when the weeding head brings impact force, so that weeding equipment with this hydraulic buffer structure can carry out weeding operations in complex terrain. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the hydraulic device of the present invention;

[0015] Figure 2 This is a schematic diagram of the structural principle of the present invention;

[0016] Figure 3 This is a schematic diagram of the weeding head of the present invention in a ground-level working posture.

[0017] The labels in the diagram are as follows:

[0018] 1. Rear boom buffer cylinder; 2. Accumulator assembly; 3. Boom side tilting cylinder; 4. One-way relief valve; 5. Boom extension cylinder; 6. Weeding head tilting cylinder; 7. Rear boom buffer arm; 8. Weeding head tilting shaft assembly; 9. Weeding head; 10. Five-bar linkage structure; 11. Mounting base; 12. Electro-hydraulic lock; 13. Two-way hydraulic check valve; 14. Three-position four-way proportional directional valve; 15. Half-moon connecting plate; 16. Connecting plate. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 , Figure 2 and Figure 3 The buffer device of the extension arm of the weeding equipment includes an extension arm and a hydraulic buffer device connected to each other; the extension arm includes a mounting base 11, a connecting plate 16, a five-bar linkage 10, a crescent connecting plate 15, a rear moving buffer arm 7, a weeding head flipping shaft assembly 8, and a weeding head 9.

[0021] Mounting base 11 is installed at the front of the power vehicle. Half-moon connecting plate 15 is installed on one side of mounting base 11. Half-moon connecting plate 15 is connected to connecting plate 16 and one end of arm tilting cylinder 3. The other end of connecting plate 16 is connected to one end of five-link structure 10. One end of five-link structure 10 is connected to one end of mounting base 11. The other end of five-link structure 10 is connected to one end of rear moving buffer arm 7. The other end of rear moving buffer arm 7 is connected to weeding head flipping shaft assembly 8 by shaft hole fitting. The shaft end of weeding head flipping shaft assembly 8 is rigidly connected to the housing of weeding head 9.

[0022] The hydraulic buffer device includes a rear boom buffer cylinder 1, an accumulator assembly 2, a boom tilting cylinder 3, a one-way relief valve 4, a boom extension cylinder 5, a weeding head tilting cylinder 6, an electro-hydraulic lock 12, a two-way hydraulic check valve 13, and a three-position four-way proportional directional valve 14.

[0023] The arm tilting cylinder 3 is mounted on the mounting base 11, with one end connected to the crescent connecting plate 15; the arm extension cylinder 5 is mounted inside the five-bar linkage 10, with both ends connected to the two intersecting links of the five-bar linkage 10; the rear arm buffer cylinder 1 is mounted on the five-bar linkage 10 with one end, and connected to the rear arm buffer arm 7 with the other end; the weeding head tilting cylinder 6 is mounted on the rear arm buffer arm 7 with one end, and connected to the weeding head tilting shaft assembly 8 with the other end.

[0024] like Figure 1 As shown, the hydraulic components, such as the cylinders, accumulator assembly 2, one-way relief valve 4, electro-hydraulic lock 12, two-way hydraulic check valve 13, and three-position four-way proportional directional valve 14, are interconnected through hydraulic joints and hydraulic pipes; the arm extension cylinder 5 is connected to the main oil circuit's inlet and return pipes through a two-way hydraulic check valve 13 and a three-position four-way proportional directional valve 14; the weeding head tilting cylinder 6 is connected to the main oil circuit through a two-way hydraulic check valve 13 and a three-position four-way proportional directional valve 14. The proportional directional valve 14 is connected to the inlet and return oil pipes of the main oil circuit, and an electro-hydraulic lock 12 is connected in parallel to the inlet and return oil pipes; the boom tilting cylinder 3 is connected to the inlet and return oil pipes of the main oil circuit through a two-way hydraulic check valve 13 and a three-position four-way proportional directional valve 14; the return oil pipe of the boom tilting cylinder 3 is connected to the accumulator assembly 2 and the rear boom buffer cylinder 1; and the inlet oil pipe of the boom tilting cylinder 3 is connected to the return oil pipe of the main oil circuit through a one-way relief valve 4.

[0025] like Figure 3As shown, during the weeding process, the hydraulic buffer function of the weeding equipment is manifested as follows: During the weeding process, the arm tilting cylinder 3 retracts while the arm extension cylinder 5 extends, and the extension arm tilts to the right and extends outward. At the same time, the accumulator assembly 2 begins to charge pressurized oil until the weeding head 9 contacts the ground with a force of less than 250N. In this embodiment, the weeding head 9 contacts the ground with a force of 200N. The weeding equipment moves with the vehicle and begins weeding. When the weeding head 9 passes through uneven ground, it is subjected to impact forces in both backward and upward directions due to terrain obstacles. At this time, the rear-moving buffer arm 7 is forced to move backward, compressing the rear-moving arm buffer cylinder 1. The hydraulic oil in the rear-moving arm buffer cylinder 1 is pumped through the hydraulic pipe to the rodless chamber of the arm tilting cylinder 3, causing the arm tilting cylinder 3 to be pushed out and the entire extension arm to extend. When the boom tilt cylinder 3 is lifted, the hydraulic oil in the rod chamber overflows through the one-way relief valve 4 to the return oil pipe. The overflow pressure of the one-way relief valve 4 on the oil pipe connected to the rod chamber of the boom tilt cylinder 3 is 7MPa to 8MPa. In this embodiment, the overflow pressure of the one-way relief valve 4 is 8MPa. The one-way valve can prevent the boom tilt cylinder 3 from being pushed out to prevent the weeding head 9 from jumping due to the sudden rise of the ground. Through the mutual linkage between the rear boom buffer cylinder 1 and the boom tilt cylinder 3, when the weeding head 9 is obstructed by the terrain, the extension arm can move the weeding head backward and lift it upward at the same time, so that the weeding head 9 can keep close to the ground and carry out weeding work through the uneven terrain. Thus, the weeding equipment with this hydraulic buffer structure has the hydraulic buffering capability to carry out weeding operations on uneven ground.

Claims

1. A bumper device for a boom of a weeding apparatus, characterized by: It comprises an extension arm and a hydraulic system; the extension arm comprises a mounting base (11), a half-moon connecting plate (15), a connecting plate (16), a five-link structure (10), a rear moving buffer arm (7), a weeding head turnover shaft assembly (8) and a weeding head (9); The mounting base (11) is mounted at the front end of the power vehicle, the half-moon connecting plate (15) is mounted on one side of the mounting base (11), one end of the half-moon connecting plate (15) is connected with the connecting plate (16), the other end of the connecting plate (16) is connected with one end of the five-link structure (10), one end of the five-link structure (10) is connected with one end of the mounting base (11), the other end of the five-link structure (10) is connected with one end of the rear moving buffer arm (7), the other end of the rear moving buffer arm (7) is connected with the weeding head turnover shaft assembly (8) in a shaft hole fitting mode, and the shaft end of the weeding head turnover shaft assembly (8) is rigidly connected with the shell of the weeding head (9); The hydraulic system comprises a rear moving arm buffer oil cylinder (1), an arm side turning oil cylinder (3), an arm extension oil cylinder (5) and a weeding head turnover oil cylinder (6); the arm extension oil cylinder (5) is communicated with the oil inlet pipe and the oil return pipe of the total oil circuit; the weeding head turnover oil cylinder (6) is communicated with the oil inlet pipe and the oil return pipe of the total oil circuit, and an electric control hydraulic lock (12) is connected with the oil inlet pipe and the oil return pipe; the arm side turning oil cylinder (3) is communicated with the oil inlet pipe and the oil return pipe of the total oil circuit, the oil return pipe of the arm side turning oil cylinder (3) is communicated with an accumulator assembly (2) and the rear moving arm buffer oil cylinder (1), and the oil inlet pipe of the arm side turning oil cylinder (3) is connected with the oil return pipe of the total oil circuit through a one-way overflow valve (4); The arm side turning oil cylinder (3) is installed on the mounting base (11), one end of which is connected to the half-moon connecting plate (15); the arm stretching oil cylinder (5) is installed in the five-link structure (10), two ends of which are respectively connected to two links of the five-link structure (10) alternately; the rear movable arm buffer oil cylinder (1) is installed on the five-link structure (10) at one end, and is connected to the rear movable buffer arm (7) at the other end; the weeding head turning oil cylinder (6) is installed on the rear movable buffer arm (7) at one end, and is connected to the weeding head turning shaft assembly (8) at the other end; in the weeding process, the arm stretching oil cylinder (5) is ejected while the arm side turning oil cylinder (3) is retracted, the stretching arm is turned to the right side and stretched outward at the same time, and the accumulator assembly (2) starts to charge pressure oil until the weeding head (9) contacts the ground with a force less than 250N; when the weeding head (9) is impacted in the backward and upward directions due to terrain obstacles when passing through uneven ground, the rear movable buffer arm (7) is forced to move backward so that the rear movable arm buffer oil cylinder (1) is compressed, and the hydraulic oil in the rear movable arm buffer oil cylinder (1) is sent to the rodless cavity of the arm side turning oil cylinder (3) through a hydraulic pipe to make the arm side turning oil cylinder (3) eject and make the whole stretching arm lift up, and when lifting up, the hydraulic oil in the rod cavity of the arm side turning oil cylinder (3) is overflowed to the oil return pipe through the one-way overflow valve (4), and the one-way can prevent the arm side turning oil cylinder (3) from ejecting to prevent the weeding head (9) from jumping due to sudden lifting of the ground, through the mutual linkage between the rear movable arm buffer oil cylinder (1) and the arm side turning oil cylinder (3), when the weeding head (9) is hindered by terrain, the stretching arm retreats the weeding head (9) backward while lifting it upward, so that the weeding head (9) keeps moving along the ground and performs weeding work through the uneven terrain.

2. The buffer device for a boom of a weeding apparatus according to claim 1, characterized by: The weeding head turning oil cylinder (6) is connected to the oil return pipe through an electrically controlled hydraulic lock (12) on the rod cavity pipe and the rodless cavity pipe.

3. The buffer device for a boom of a weeding apparatus according to claim 1 or 2, characterized in that: The overflow pressure of the one-way overflow valve (4) connected to the rod cavity oil pipe of the arm side turning oil cylinder (3) is 7MPa to 8MPa.

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