Hydraulic system of square bale picking loader and control method of hydraulic system

Abstract

The invention belongs to the technical field of bale picking loaders, and discloses a hydraulic system of a square bale picking loader and a control method thereof.The system comprises a bale conveying motor, a bale discharging oil cylinder, a bale clamping oil cylinder, a lower steering oil cylinder, an upper steering oil cylinder, an overturning oil cylinder, a high-pressure pump and a medium-pressure pump; a first electro-hydraulic directional control valve is arranged between the bale conveying motor and the high-pressure pump, a second electro-hydraulic directional control valve is arranged between the bale discharging oil cylinder and the medium-pressure pump, a third electro-hydraulic directional control valve is arranged between the bale clamping oil cylinder and the medium-pressure pump, and a fourth electro-hydraulic directional control valve is arranged between the lower portion of the steering oil cylinder and the medium-pressure pump. A fifth electro-hydraulic directional control valve is arranged between the steering oil cylinder and the medium-pressure pump; a sixth electro-hydraulic directional control valve is arranged between the overturning oil cylinder and the medium-pressure pump; the medium-pressure pump and the high-pressure pump are in transmission connection with the rear-end power output shaft through the transmission component, the rear-end power output shaft of the tractor outputs power to the medium-pressure pump and the high-pressure pump to serve as a power source to drive a hydraulic system, and power transmission loss is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bale picking-up loaders, and in particular relates to a hydraulic system of a square bale picking-up loader and a control method thereof. Background Art

[0002] In agricultural production, it is particularly important to reduce labor intensity and save manpower costs. Therefore, promoting mechanized operations has become an inevitable trend in modern agriculture.

[0003] After corn, wheat and other straw are baled, if manpower is used to pick up the bales in the field, transport and load them, the production efficiency is low and the transportation cost is high. The square bale picking loader can solve this problem. The square bale picking loader uses a tractor (50 horsepower and above) to automatically pick up small square bales wrapped with nets (including small square bales of the same size with ropes) in the field. The full load capacity is ≥90 bales (each bale weighs about 25kg), which can effectively replace manual picking and transportation and reduce damage to the land.

[0004] However, the hydraulic system of the existing square bale picking loader has large energy loss, high oil temperature and large power transmission loss. Summary of the invention

[0005] In view of the above problems, the present invention provides a hydraulic system for a square bale picking loader and a control method thereof, which adopts the following technical solutions: A hydraulic system for a square bale picking loader, comprising a bale conveying motor, a bale discharging cylinder, a bale clamping cylinder, a lower steering cylinder, an upper steering cylinder, a turning cylinder, a high-pressure pump and a medium-pressure pump; A first electro-hydraulic reversing valve is provided between the bale conveying motor and the outlet of the high-pressure pump, the inlet of the high-pressure pump is connected to the oil tank, a second electro-hydraulic reversing valve is provided between the bale discharging cylinder and the outlet of the medium-pressure pump, the inlet of the medium-pressure pump is connected to the oil tank, a third electro-hydraulic reversing valve is provided between the bale clamping cylinder and the outlet of the medium-pressure pump, a fourth electro-hydraulic reversing valve is provided between the lower part of the steering cylinder and the outlet of the medium-pressure pump, a fifth electro-hydraulic reversing valve is provided between the upper part of the steering cylinder and the outlet of the medium-pressure pump; a sixth electro-hydraulic reversing valve is provided between the flipping cylinder and the outlet of the medium-pressure pump; The T port of the first electro-hydraulic reversing valve, the T port of the second electro-hydraulic reversing valve, the T port of the third electro-hydraulic reversing valve, the T port of the fourth electro-hydraulic reversing valve, the T port of the fifth electro-hydraulic reversing valve, and the T port of the sixth electro-hydraulic reversing valve are all connected to the oil tank; the medium-pressure pump and the high-pressure pump are connected to the rear end power output shaft of the tractor through a transmission component, and the overflow return oil port of the bale conveying motor is connected to the oil tank.

[0006] Furthermore, the oil inlet and oil outlet of the bale conveying motor are respectively connected to the A port and the B port of the first electro-hydraulic reversing valve, the P port of the first electro-hydraulic reversing valve is connected to one end of the pipeline A, the other end of the pipeline A is connected to one end of the pipeline H and one end of the pipeline D, the other end of the pipeline H is connected to the outlet of the high-pressure pump; the other end of the pipeline D is connected to one end of the pipeline F, and the other end of the pipeline F is connected to the oil tank.

[0007] Furthermore, the oil inlet and outlet of the oil cylinder are respectively connected to the A port and B port of the second electro-hydraulic reversing valve, the P port of the second electro-hydraulic reversing valve is connected to one end of the pipeline I, and the other end of the pipeline I is connected to the outlet of the medium-pressure pump.

[0008] Further, the oil inlet and the oil outlet of the clamping cylinder are respectively connected to the A port and the B port of the third electro-hydraulic reversing valve, and the P port of the third electro-hydraulic reversing valve is connected to the pipeline I through the pipeline B; The oil inlet and the oil outlet under the steering cylinder are respectively connected to the A port and the B port of the fourth electro-hydraulic reversing valve, and the P port of the fourth electro-hydraulic reversing valve is connected to the pipeline I through the pipeline B; The oil inlet and the oil outlet on the steering cylinder are respectively connected to the A port and the B port of the fifth electro-hydraulic reversing valve, and the P port of the fifth electro-hydraulic reversing valve is connected to the pipeline I through the pipeline B; The oil inlet and the oil outlet of the tilting cylinder are respectively connected to the A port and the B port of the sixth electro-hydraulic reversing valve, and the P port of the sixth electro-hydraulic reversing valve is connected to the pipeline I through the pipeline B.

[0009] Further, the T port of the first electro-hydraulic reversing valve, the T port of the second electro-hydraulic reversing valve, the T port of the third electro-hydraulic reversing valve, the T port of the fourth electro-hydraulic reversing valve, the T port of the fifth electro-hydraulic reversing valve, and the T port of the sixth electro-hydraulic reversing valve are all connected to the pipeline F through the pipeline C.

[0010] Furthermore, one end of pipeline E is connected to the pipeline I, and the other end of pipeline E is connected to pipeline C through pipeline G; one end of pipeline J is connected to the overflow return oil port of the bale conveying motor, and the other end of pipeline J is connected to the oil tank.

[0011] Furthermore, a first hydraulic lock is provided between the bag discharging cylinder and the second electro-hydraulic reversing valve, a second hydraulic lock is provided between the bag clamping cylinder and the third electro-hydraulic reversing valve, and a third hydraulic lock is provided between the flipping cylinder and the sixth electro-hydraulic reversing valve.

[0012] Furthermore, the pipeline D is provided with a first pilot electromagnetic overflow valve, and the pipeline E is provided with a second pilot electromagnetic overflow valve.

[0013] Further, the transmission component includes a speed-increasing gearbox; wherein the speed-increasing gearbox includes a gearbox body, a transmission shaft, a driving gear, a first driven gear and a second driven gear, the transmission shaft is rotatably arranged in the gearbox body, and one end of the transmission shaft passes through and extends outside the gearbox body, and a quick connector is provided at one end of the transmission shaft located outside the gearbox body; The transmission shaft is connected to the rear end power output shaft through the quick connector, the driving gear, the first driven gear and the second driven gear are all arranged in the gear box body and mesh with each other, and the driving gear is fixedly arranged on the transmission shaft; The medium-pressure pump and the high-pressure pump are both fixed on the gearbox body, the driving shaft of the medium-pressure pump penetrates into the gearbox body and is fixedly connected to the first driven gear; the driving shaft of the high-pressure pump penetrates into the gearbox body and is fixedly connected to the second driven gear.

[0014] The present invention also provides a method for controlling the hydraulic system of the square bale picking loader, comprising the following steps: The hydraulic oil is delivered to the rodless chamber of the clamping cylinder through the medium-pressure pump, so that the telescopic rod of the clamping cylinder moves to tighten the other bale; When the width of the square bale is identified as the width of the square bale, the hydraulic oil is delivered to the rodless chamber under the steering cylinder through the medium pressure pump to drive the square bale to turn over, so that the height of the square bale is the placement width; When the telescopic rod under the steering cylinder moves to the maximum stroke, the hydraulic oil is delivered to the rodless chamber of the turning cylinder through the medium-pressure pump, turning the square straw bale from the ground to the parallel entrance of the conveying track; When the telescopic rod of the turning cylinder moves to the maximum stroke, the hydraulic oil is delivered to the rodless cavity on the steering cylinder through the medium-pressure pump, so that the square straw bale enters the conveying track; When the square bale enters the conveying track, the hydraulic oil is delivered to the oil inlet of the bale conveying motor through the high-pressure pump to drive the conveying track, so that the square bale is output to the conveying track for storage; When the bales in the conveying track are saturated, the clamping cylinder, the lower steering cylinder, the upper steering cylinder and the turning cylinder all stop working. When the bales are unloaded and placed at the designated location, the medium-pressure pump delivers hydraulic oil to the rodless chamber of the bale discharge cylinder to lift the bale discharge frame to the pointing angle. When the bale rack reaches the specified angle, the hydraulic oil is transported to the oil inlet of the bale conveying motor through the high-pressure pump, and the conveying track runs to transport the square bale to the bale rack, and the square bale falls from the bale rack to the specified position.

[0015] Beneficial effects of the present invention: 1. The medium-pressure pump and the high-pressure pump of the embodiment of the present invention are connected to the rear-end power output shaft of the tractor through a transmission component, and the rear-end power output shaft of the tractor outputs power to the medium-pressure pump and the high-pressure pump as a power source to drive the hydraulic system. Compared with the prior art, under the same driving power, compared with the traditional universal joint gearbox, the power transmission loss is reduced.

[0016] 2. The embodiment of the present invention uses the bale conveying motor, the bale discharging cylinder, the bale clamping cylinder, the lower steering cylinder, the upper steering cylinder and the flipping cylinder to pick up and grasp the bales, adjust the bale posture, place and load the bales for transportation, thereby realizing the picking up, rotating, flipping, placing, orderly conveying and transporting, conveying and storing of the bales, reducing the energy loss of the hydraulic system and reducing the oil temperature of the entire hydraulic system.

[0017] 3. The embodiment of the present invention recognizes the square hay bale and, according to the posture of the square hay bale, uses the high-pressure pump and the medium-pressure pump to work in combination, thereby effectively reducing the energy loss of the hydraulic system and lowering the oil temperature of the entire hydraulic system.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It shows a structural schematic diagram of a hydraulic system of a square bale picking loader according to an embodiment of the present invention; Figure 2 A schematic diagram of the installation of a hydraulic system and a chassis of a square bale picking loader according to an embodiment of the present invention is shown; Figure 3 A schematic diagram showing the installation of a hydraulic system according to an embodiment of the present invention and a rear end power output shaft of a tractor is shown; Figure 4 A schematic flow chart of a control method for a hydraulic system of a square bale picking loader according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the installation of a circular track trolley according to an embodiment of the present invention is shown; Figure 6A schematic diagram of the installation of a hydraulic motor according to an embodiment of the present invention is shown; Figure 7 A schematic diagram showing a square hay bale in a first posture according to an embodiment of the present invention; Figure 8 A schematic diagram showing a square hay bale entering a second posture according to an embodiment of the present invention; Fig. 9 A schematic diagram showing a 90° flipping of a square hay bale according to an embodiment of the present invention is shown; Fig.10 A schematic diagram showing translation feeding of square grass bales according to an embodiment of the present invention is shown.

[0021] In the figure: 1. bale conveying motor; 2. bale discharging cylinder; 3. bale clamping cylinder; 4. steering cylinder below; 5. steering cylinder above; 6. turning cylinder; 7. first electro-hydraulic reversing valve; 8. second electro-hydraulic reversing valve; 9. third electro-hydraulic reversing valve; 10. fourth electro-hydraulic reversing valve; 11. fifth electro-hydraulic reversing valve; 12. sixth electro-hydraulic reversing valve; 13. first pilot electromagnetic overflow valve; 14. second pilot electromagnetic overflow valve; 15. high-pressure pump; 16. medium-pressure pump; 17. oil suction filter; 18. oil return filter; 19. oil tank; 20. pipeline A; 21. pipeline B; 22 , pipeline C; 23, pipeline D; 24, pipeline E; 25, pipeline F; 26, pipeline G; 27, pipeline H; 28, pipeline I; 29, pipeline J; 30, the first hydraulic lock; 31, the second hydraulic lock; 32, the third hydraulic lock; 33, the liquid level and oil temperature measuring instrument; 34, the air filter; 35, the first hydraulic gauge; 36, the second hydraulic gauge; 37, the chassis; 38, the transmission parts; 39, the bag-in counter; 40, the conveying track; 42, the bag-out counter; 44, the bag-out rack; 45, the tractor; 46, the rear-end power output shaft; 47, the gearbox body. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the orientation or positional relationship shown in the accompanying drawings.

[0024] The embodiment of the present invention provides a hydraulic system of a square bale picking loader and a control method thereof, wherein the power output shaft (PTO, Power Take Off) of a tractor's rear end is used to supply power to a hydraulic pump as a power source to drive the entire hydraulic system, and the square bale picking loader is controlled to perform operations such as picking up and grasping bales, adjusting the posture of square bales, placing, loading and transporting bales, and realizing operations such as picking up, rotating, turning over, placing, orderly transporting and carrying, and transporting out of bales for storage.

[0025] like Figure 1 As shown, a hydraulic system of a square bale picking loader includes a bale conveying motor 1, a bale discharging cylinder 2, a bale clamping cylinder 3, a lower steering cylinder 4, an upper steering cylinder 5, a turning cylinder 6, a high-pressure pump 15 and a medium-pressure pump 16.

[0026] like Figure 2 As shown, the bale discharging cylinder 2 is fixed to the middle position of the front end of the chassis 37 by a bracket, the bale conveying motor 1 is fixedly arranged at the front end of the chassis 37 near the bale discharging cylinder 2, the bale clamping cylinder 3, the lower steering cylinder 4, the upper steering cylinder 5, and the turning cylinder 6 are arranged on one side of the rear end of the chassis 37, and the rear end of the chassis 37 is provided with a transmission component 38 connected to the rear end power output shaft 46 of the tractor 45.

[0027] A first electro-hydraulic reversing valve 7 is provided between the bale conveying motor 1 and the outlet of the high-pressure pump 15, and the inlet of the medium-pressure pump 16 is connected to the oil tank 19. For example, the oil inlet and the oil outlet of the bale conveying motor 1 are respectively connected to the A port (oil outlet) and the B port (oil outlet) of the first electro-hydraulic reversing valve 7, the P port (oil inlet) of the first electro-hydraulic reversing valve 7 is connected to one end of the pipeline A20, the other end of the pipeline A20 is connected to one end of the pipeline H27 and one end of the pipeline D23, and the other end of the pipeline H27 is connected to the outlet of the high-pressure pump 15.

[0028] The other end of the pipeline D23 is communicated with one end of the pipeline F25 . A first pilot electromagnetic overflow valve 13 is provided on the pipeline D23 . The other end of the pipeline F25 is communicated with the oil tank 19 .

[0029] The embodiment of the present invention provides the first pilot electromagnetic relief valve 13, and when the system pressure P is between P1 and 17% P1, it eliminates the large power loss caused by the one-way sequence valve not being fully opened, reduces the heat generated by the hydraulic oil, and lowers the hydraulic oil temperature.

[0030] A second electro-hydraulic reversing valve 8 is arranged between the oil outlet cylinder 2 and the outlet of the medium-pressure pump 16, and the inlet of the medium-pressure pump 16 is connected to the oil tank 19. For example, the oil inlet and oil outlet of the oil outlet cylinder 2 are respectively connected to the A port (oil outlet) and the B port (oil outlet) of the second electro-hydraulic reversing valve 8, and the P port (oil inlet) of the second electro-hydraulic reversing valve 8 is connected to one end of the pipeline I28, and the other end of the pipeline I28 is connected to the outlet of the medium-pressure pump 16.

[0031] like Figure 3 As shown, the medium-pressure pump 16 and the high-pressure pump 15 are connected to the rear-end power output shaft 46 (PTO, Power Take Off) of the tractor 45 through the transmission component 38, and the rear-end power output shaft 46 of the tractor 45 outputs power to the medium-pressure pump 16 and the high-pressure pump 15 as a power source to drive the hydraulic system. Compared with the prior art, under the same driving power, compared with the traditional universal joint gearbox, the power transmission loss is reduced.

[0032] For example, the transmission component 38 includes a speed-increasing gearbox, which includes a gearbox body 47, a transmission shaft, a driving gear, a first driven gear and a second driven gear. The transmission shaft is rotatably arranged in the gearbox body 47, and one end of the transmission shaft passes through and extends to the outside of the gearbox body 47. A quick connector is provided at one end of the transmission shaft located outside the gearbox body 47, and the quick connector and the transmission shaft are an integrated structure.

[0033] The transmission shaft is connected to the rear-end power output shaft 46 through a quick connector. For example, a quick socket is provided in the quick connector, and the quick connector is used to quickly plug into the rear-end power output shaft 46 to facilitate power transmission; the driving gear, the first driven gear and the second driven gear are all arranged in the gear box body 47 and mesh with each other. The driving gear is fixed on the transmission shaft, and the number of teeth of the driving gear is greater than the number of teeth of the first driven gear and the second driven gear.

[0034] The medium-pressure pump 16 and the high-pressure pump 15 are both fixed on the gearbox body 47. The drive shaft of the medium-pressure pump 16 penetrates into the gearbox body 47 and is fixedly connected to the first driven gear; the drive shaft of the high-pressure pump 15 penetrates into the gearbox body 47 and is fixedly connected to the second driven gear. The gearbox body 47, the medium-pressure pump 16, and the high-pressure pump 15 are sealed and connected. The medium-pressure pump 16 and the high-pressure pump 15 are provided with an oil inlet and an oil outlet on both sides thereof.

[0035] A third electro-hydraulic reversing valve 9 is arranged between the clamp cylinder 3 and the outlet of the medium-pressure pump 16. For example, the oil inlet and oil outlet of the clamp cylinder 3 are respectively connected to the A port (oil outlet) and the B port (oil outlet) of the third electro-hydraulic reversing valve 9, and the P port (oil inlet) of the third electro-hydraulic reversing valve 9 is connected to the pipeline I28 through the pipeline B21.

[0036] A fourth electro-hydraulic reversing valve 10 is provided between the steering cylinder 4 and the outlet of the medium-pressure pump 16. For example, the oil inlet and oil outlet of the steering cylinder 4 are respectively connected to the A port (oil outlet) and the B port (oil outlet) of the fourth electro-hydraulic reversing valve 10, and the P port (oil inlet) of the fourth electro-hydraulic reversing valve 10 is connected to the pipeline I28 through the pipeline B21.

[0037] A fifth electro-hydraulic reversing valve 11 is provided between the steering cylinder 5 and the outlet of the medium-pressure pump 16. For example, the oil inlet and the oil outlet of the steering cylinder 5 are respectively connected to the A port (oil outlet) and the B port (oil outlet) of the fifth electro-hydraulic reversing valve 11, and the P port (oil inlet) of the fifth electro-hydraulic reversing valve 11 is connected to the pipeline I28 through the pipeline B21.

[0038] A sixth electro-hydraulic reversing valve 12 is arranged between the flipping cylinder 6 and the outlet of the medium-pressure pump 16. For example, the oil inlet and oil outlet of the flipping cylinder 6 are respectively connected to the A port (oil outlet) and the B port (oil outlet) of the sixth electro-hydraulic reversing valve 12, and the P port (oil inlet) of the sixth electro-hydraulic reversing valve 12 is connected to the pipeline I28 through the pipeline B21.

[0039] The T port (oil return port) of the first electro-hydraulic reversing valve 7, the T port (oil return port) of the second electro-hydraulic reversing valve 8, the T port (oil return port) of the third electro-hydraulic reversing valve 9, the T port (oil return port) of the fourth electro-hydraulic reversing valve 10, the T port (oil return port) of the fifth electro-hydraulic reversing valve 11, and the T port (oil return port) of the sixth electro-hydraulic reversing valve 12 are all connected to the oil tank 19.

[0040] For example, the T port (oil return port) of the first electro-hydraulic reversing valve 7, the T port (oil return port) of the second electro-hydraulic reversing valve 8, the T port (oil return port) of the third electro-hydraulic reversing valve 9, the T port (oil return port) of the fourth electro-hydraulic reversing valve 10, the T port (oil return port) of the fifth electro-hydraulic reversing valve 11, and the T port (oil return port) of the sixth electro-hydraulic reversing valve 12 are all connected to the pipeline F25 through the pipeline C22.

[0041] One end of the pipeline E24 is connected to the pipeline I28, and the other end of the pipeline E24 is connected to the pipeline C22 through the pipeline G26. A second pilot electromagnetic overflow valve 14 is provided on the pipeline E24.

[0042] The overflow oil return port of the bale conveying motor 1 is connected to the oil tank 19 . For example, one end of the pipeline J29 is connected to the overflow oil return port of the bale conveying motor 1 , and the other end of the pipeline J29 is connected to the oil tank 19 .

[0043] The high-pressure pump 15 is used to transport the hydraulic oil in the oil tank 19 to the bale conveying motor 1 through the pipeline H27; the medium-pressure pump 16 is used to transport the hydraulic oil in the oil tank 19 to the bale cylinder 2, the bale clamping cylinder 3, the lower steering cylinder 4, the upper steering cylinder 5, and the turning cylinder 6 through the pipeline I28 and the pipeline B21.

[0044] For example, a first hydraulic lock 30 is provided between the bag discharging cylinder 2 and the second electro-hydraulic reversing valve 8, a second hydraulic lock 31 is provided between the bag clamping cylinder 3 and the third electro-hydraulic reversing valve 9, and a third hydraulic lock 32 is provided between the flipping cylinder 6 and the sixth electro-hydraulic reversing valve 12 to ensure the oil locking state of the cylinders.

[0045] For example, an oil suction filter 17 is provided on the oil tank 19 , one end of the oil suction filter 17 is connected to the oil outlet of the oil tank 19 , and the other end of the oil suction filter 17 is connected to the inlet of the medium-pressure pump 16 and the inlet of the high-pressure pump 15 .

[0046] For example, the oil tank 19 is provided with an oil return filter 18, one end of the oil return filter 18 is connected to the oil return port of the oil tank 19, and the other end of the oil return filter 18 is connected to the other end of the pipeline F25 and the other end of the pipeline J29.

[0047] For example, the oil tank 19 is also provided with a liquid level and oil temperature measuring instrument 33 and an air filter 34. The liquid level and oil temperature measuring instrument 33 is used to measure the liquid level of the oil tank 19 and the liquid level in the oil tank 19, and the air filter 34 is used to filter the air in the oil tank 19.

[0048] For example, a first hydraulic gauge 35 is provided on the pipeline H27, and the first hydraulic gauge 35 is used to measure the pressure P on the pipeline H27; a second hydraulic gauge 36 is provided on the pipeline I28, and the second hydraulic gauge 36 is used to measure the pressure P1 on the pipeline I28.

[0049] The hydraulic system of the embodiment of the present invention drives the bale conveying motor 1, the bale discharging cylinder 2, the bale clamping cylinder 3, the lower steering cylinder 4, the upper steering cylinder 5 and the turning cylinder 6 to realize the picking up, rotating, turning, placing, orderly conveying and transporting of the bales, and conveying and storing the bales.

[0050] The hydraulic system of the embodiment of the present invention effectively reduces the energy loss of the hydraulic system by working in combination with the high-pressure pump 15 and the medium-pressure pump 16 .

[0051] like Figure 4 As shown, an embodiment of the present invention further provides a control method for a hydraulic system of a square grass bale picking loader, which is used for the hydraulic system of the square grass bale picking loader, and comprises the following steps: S1. The hydraulic oil is delivered to the rodless chamber of the clamping cylinder 3 through the medium-pressure pump 16, so that the telescopic rod of the clamping cylinder 3 moves to tighten the other bale, and is fixed and tightened under the action of the hydraulic lock to prevent the bale from loosening and identify the posture of the bale according to the width of the tightened bale.

[0052] For example, the size of a square hay bale is 800 mm long, 450 mm wide, and 350 mm high. When the width of the square hay bale is identified as the height of the square hay bale, the square hay bale is determined to be in the first posture. If the width of the square hay bale is identified as the width of the square hay bale, the square hay bale is determined to be in the second posture.

[0053] The process of delivering the hydraulic oil to the rodless chamber of the clamping cylinder 3 by the medium pressure pump 16 includes the following steps: The medium-pressure pump 16 delivers the hydraulic oil in the oil tank 19 to the rodless chamber of the clamp cylinder 3 through the pipeline I28, the pipeline B21, and the P port (oil inlet) of the third electro-hydraulic reversing valve 9 in sequence.

[0054] S2, such as Figure 7 As shown in FIG. 1 , when it is recognized that the width of the square bale is equal to the height of the square bale (for example, 350 mm), that is, the square bale is in the first posture, the steering cylinder 4 does not move without a command; Figure 8 As shown in FIG. 1 , when it is recognized that the width of the square bale is the width of the square bale (eg, 450 mm), the square bale enters the second posture, as shown in FIG. Fig. 9 As shown, the hydraulic oil is delivered to the rodless chamber of the steering cylinder 4 by the medium pressure pump 16 to drive the square straw bale to turn over, so that the height of the square straw bale (for example, 350 mm) is the placement width.

[0055] The hydraulic oil is delivered to the rodless cavity of the steering cylinder 4 by the medium pressure pump 16, which includes the following steps: The medium-pressure pump 16 delivers the hydraulic oil in the oil tank 19 to the rodless chamber of the steering cylinder 4 through the pipeline I28, the pipeline B21, and the P port (oil inlet) of the fourth electro-hydraulic reversing valve 10 in sequence.

[0056] S3, when the 4 telescopic rods under the steering cylinder move to the maximum stroke, Fig.10 As shown, the hydraulic oil is delivered to the rodless chamber of the turning cylinder 6 by the medium pressure pump 16 , so that the square straw bale is turned 180 degrees from the ground to the parallel entrance of the conveying track 40 .

[0057] The hydraulic oil is delivered to the rodless chamber of the tilting cylinder 6 by the medium pressure pump 16, which includes the following steps: The medium-pressure pump 16 delivers the hydraulic oil in the oil tank 19 to the rodless chamber of the tilting cylinder 6 through the pipeline I28, the pipeline B21, and the P port (oil inlet) of the sixth electro-hydraulic reversing valve 12 in sequence.

[0058] S4. When the telescopic rod of the turning cylinder 6 moves to the maximum stroke, the hydraulic oil is delivered to the rodless cavity of the steering cylinder 5 through the medium-pressure pump 16, so that the square straw bale enters the conveying track 40, and the telescopic rods of the clamping cylinder 3, the steering cylinder 4, the steering cylinder 5, and the turning cylinder 6 are reset.

[0059] The hydraulic oil is delivered to the rodless chamber of the steering cylinder 5 by the medium pressure pump 16, which includes the following steps: The medium-pressure pump 16 delivers the hydraulic oil in the oil tank 19 to the rodless chamber 5 of the steering cylinder 5 through the pipeline I28, the pipeline B21, and the P port (oil inlet) of the fifth electro-hydraulic reversing valve 11 in sequence.

[0060] like Figure 5 and Figure 6 As shown, a conveying track 40 is arranged on a chassis 37, a package discharging rack 44 is arranged on a side of the conveying track 40 away from the transmission component 38, an incoming package counter 39 is arranged at the bottom of the conveying track 40 near the transmission component 38, and a outgoing package counter 42 is arranged at the top of the conveying track 40 near the outgoing package rack 44.

[0061] S5. When the square straw bale enters the conveying track 40, the hydraulic oil is conveyed to the oil inlet of the straw bale conveying motor 1 through the high-pressure pump 15 to drive the conveying track 40 to operate, so that the square straw bale is output to the conveying track 40 for storage. The above actions are repeated until the square straw bales fill the conveying track 40.

[0062] The hydraulic oil is delivered to the oil inlet of the bale conveying motor 1 by the high pressure pump 15, comprising the following steps: The medium-pressure pump 16 delivers the hydraulic oil in the oil tank 19 to the oil inlet of the bale conveying motor 1 through the pipeline H27 and the P port (oil inlet) of the first electro-hydraulic reversing valve 7 in sequence.

[0063] The square grass bale is placed on the conveying track 40, triggering the count of the bale-in counter 39, and the bale conveying motor 1 drives the conveying track 40 to run 1000 mm to transport the square grass bale backwards; this process is repeated until the bale-out counter 42 is triggered, and it is determined that the square grass bale is full.

[0064] S6. When the square straw bales in the conveying track 40 are saturated, the clamping cylinder 3, the lower steering cylinder 4, the upper steering cylinder 5, and the turning cylinder 6 all stop working, and the hydraulic oil flows into the oil tank 19 (in sequence through the pipeline B21, the pipeline I28, the pipeline E24, the second pilot electromagnetic overflow valve 14, the pipeline G26, the pipeline C22, and the pipeline F25 into the oil tank 19). When the square straw bales are unloaded and placed at the designated location, the medium-pressure pump 16 delivers the hydraulic oil to the rodless cavity of the bale discharge cylinder 2, so that the bale discharge frame is lifted and the bale discharge frame reaches the pointing angle.

[0065] The medium pressure pump 16 first delivers the hydraulic oil to the rodless chamber of the oil cylinder 2, including the following steps: The medium-pressure pump 16 delivers the hydraulic oil in the oil tank 19 to the rodless chamber 5 of the steering cylinder 5 through the pipeline I28 and the P port (oil inlet) of the second electro-hydraulic reversing valve 8 in sequence.

[0066] S7. When the bale discharging rack 44 reaches the specified angle, the hydraulic oil is delivered to the oil inlet of the bale conveying motor 1 through the high-pressure pump 15, and the conveying track 40 runs to convey the square bale to the bale discharging rack 44, and the square bale falls from the bale discharging rack 44 to the specified position.

[0067] S8, unloading square straw bales, first use the wireless remote control to control the bale discharge cylinder 2 to raise the bale discharge frame 44 to a specified height, and then drive the conveying track 40 to run through the bale conveying motor 1, and perform three modes of unloading and stacking square straw bales, namely automatic, semi-automatic and inching.

[0068] The control method of the hydraulic system in the embodiment of the present invention performs intelligent hydraulic control operations according to the posture of the square straw bale, reduces the energy loss of the hydraulic system, and reduces the oil temperature of the entire hydraulic system.

[0069] The existing bale picking and loading machine requires at least three or more people to complete the tasks of picking up, transporting and loading, and it cannot work continuously and efficiently. The hydraulic system of the embodiment of the present invention can realize the continuous operation of picking up, storing, transporting and other functions after being applied to the bale picking and loading machine. The cost of the picking and loading machine can be reduced by 50% for every 100 bales of bales, saving 2 to 4 labor costs, and it can work continuously, and the benefits are significantly improved.

[0070] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic system for a square bale picking loader, characterized in that: It comprises a bale conveying motor (1), a bale discharging cylinder (2), a bale clamping cylinder (3), a lower steering cylinder (4), an upper steering cylinder (5), a turning cylinder (6), a high-pressure pump (15) and a medium-pressure pump (16); A first electro-hydraulic reversing valve (7) is provided between the bale conveying motor (1) and the outlet of the high-pressure pump (15); the inlet of the high-pressure pump (15) is connected to the oil tank (19); a second electro-hydraulic reversing valve (8) is provided between the bale discharging cylinder (2) and the outlet of the medium-pressure pump (16); the inlet of the medium-pressure pump (16) is connected to the oil tank (19); a third electro-hydraulic reversing valve (9) is provided between the bale clamping cylinder (3) and the outlet of the medium-pressure pump (16); a fourth electro-hydraulic reversing valve (10) is provided between the lower steering cylinder (4) and the outlet of the medium-pressure pump (16); a fifth electro-hydraulic reversing valve (11) is provided between the upper steering cylinder (5) and the outlet of the medium-pressure pump (16); and a sixth electro-hydraulic reversing valve (12) is provided between the turning cylinder (6) and the outlet of the medium-pressure pump (16); The T-port of the first electro-hydraulic reversing valve (7), the T-port of the second electro-hydraulic reversing valve (8), the T-port of the third electro-hydraulic reversing valve (9), the T-port of the fourth electro-hydraulic reversing valve (10), the T-port of the fifth electro-hydraulic reversing valve (11), and the T-port of the sixth electro-hydraulic reversing valve (12) are all connected to the oil tank (19); the medium-pressure pump (16) and the high-pressure pump (15) are connected to the rear end power output shaft (46) of the tractor (45) through a transmission component (38); and the overflow oil return port of the bale conveying motor (1) is connected to the oil tank (19).

2. The hydraulic system for a square bale picker and loader according to claim 1, characterized in that: The oil inlet and the oil outlet of the bale conveying motor (1) are respectively connected to the A port and the B port of the first electro-hydraulic reversing valve (7); the P port of the first electro-hydraulic reversing valve (7) is connected to one end of a pipeline A (20); the other end of the pipeline A (20) is connected to one end of a pipeline H (27) and one end of a pipeline D (23); the other end of the pipeline H (27) is connected to the outlet of the high-pressure pump (15); the other end of the pipeline D (23) is connected to one end of a pipeline F (25); the other end of the pipeline F (25) is connected to the oil tank (19).

3. The hydraulic system for a square bale picker and loader according to claim 2, characterized in that: The oil inlet and the oil outlet of the oil discharge cylinder (2) are respectively connected to the A port and the B port of the second electro-hydraulic reversing valve (8); the P port of the second electro-hydraulic reversing valve (8) is connected to one end of the pipeline I (28); and the other end of the pipeline I (28) is connected to the outlet of the medium-pressure pump (16).

4. The hydraulic system for a square bale picker and loader according to claim 3, characterized in that: The oil inlet and the oil outlet of the clamping oil cylinder (3) are respectively connected to the A port and the B port of the third electro-hydraulic reversing valve (9), and the P port of the third electro-hydraulic reversing valve (9) is connected to the pipeline I (28) through the pipeline B (21); The oil inlet and the oil outlet of the steering cylinder (4) are respectively connected to the A port and the B port of the fourth electro-hydraulic reversing valve (10), and the P port of the fourth electro-hydraulic reversing valve (10) is connected to the pipeline I (28) through the pipeline B (21); The oil inlet and the oil outlet on the steering cylinder (5) are respectively connected to the A port and the B port of the fifth electro-hydraulic reversing valve (11), and the P port of the fifth electro-hydraulic reversing valve (11) is connected to the pipeline I (28) through the pipeline B (21); The oil inlet and the oil outlet of the tilting oil cylinder (6) are respectively connected to the A port and the B port of the sixth electro-hydraulic reversing valve (12), and the P port of the sixth electro-hydraulic reversing valve (12) is connected to the pipeline I (28) through the pipeline B (21).

5. The hydraulic system for a square bale picker and loader according to claim 4, characterized in that: The T port of the first electro-hydraulic reversing valve (7), the T port of the second electro-hydraulic reversing valve (8), the T port of the third electro-hydraulic reversing valve (9), the T port of the fourth electro-hydraulic reversing valve (10), the T port of the fifth electro-hydraulic reversing valve (11), and the T port of the sixth electro-hydraulic reversing valve (12) are all connected to the pipeline F (25) through the pipeline C (22).

6. The hydraulic system for a square bale picker and loader according to claim 5, characterized in that: One end of the pipeline E (24) is connected to the pipeline I (28), and the other end of the pipeline E (24) is connected to the pipeline C (22) through the pipeline G (26); one end of the pipeline J (29) is connected to the overflow oil return port of the bale conveying motor (1), and the other end of the pipeline J (29) is connected to the oil tank (19).

7. The hydraulic system for a square bale picker and loader according to any one of claims 1 to 5, characterized in that: A first hydraulic lock (30) is provided between the bag-discharging cylinder (2) and the second electro-hydraulic reversing valve (8), a second hydraulic lock (31) is provided between the bag-clamping cylinder (3) and the third electro-hydraulic reversing valve (9), and a third hydraulic lock (32) is provided between the turning cylinder (6) and the sixth electro-hydraulic reversing valve (12).

8. The hydraulic system for a square bale picker and loader according to claim 6, characterized in that: The pipeline D (23) is provided with a first pilot electromagnetic overflow valve (13), and the pipeline E (24) is provided with a second pilot electromagnetic overflow valve (14).

9. The hydraulic system of a square bale pick-up loader according to any one of claims 1 to 5, characterized in that: The transmission component (38) includes a speed increasing gear box; The speed increasing gearbox comprises a gearbox body (47), a transmission shaft, a driving gear, a first driven gear and a second driven gear. The transmission shaft is rotatably arranged in the gearbox body (47), and one end of the transmission shaft passes through and extends outside the gearbox body (47). A quick connector is provided at one end of the transmission shaft located outside the gearbox body (47). The transmission shaft is transmission-connected to the rear-end power output shaft (46) through the quick connector, the driving gear, the first driven gear and the second driven gear are all arranged in the gearbox body (47) and mesh with each other, and the driving gear is fixedly arranged on the transmission shaft; The medium-pressure pump (16) and the high-pressure pump (15) are both fixed on the gearbox body (47); the drive shaft of the medium-pressure pump (16) penetrates into the gearbox body (47) and is fixedly connected to the first driven gear; the drive shaft of the high-pressure pump (15) penetrates into the gearbox body (47) and is fixedly connected to the second driven gear.

10. A method for controlling a hydraulic system of a square bale picking loader according to any one of claims 1 to 9, characterized in that: The following steps are involved: The hydraulic oil is delivered to the rodless chamber of the clamping oil cylinder (3) by means of a medium-pressure pump (16), so that the telescopic rod of the clamping oil cylinder (3) moves to tighten the other straw bale; When it is recognized that the width of the square straw bale is the width of the square straw bale, the hydraulic oil is delivered to the rodless chamber below the steering cylinder (4) through the medium pressure pump (16) to drive the square straw bale to turn over, so that the height of the square straw bale is the placement width; When the telescopic rod of the lower steering cylinder (4) moves to the maximum stroke, the hydraulic oil is delivered to the rodless chamber of the turning cylinder (6) through the medium-pressure pump (16), so that the square straw bale is turned from the ground to the parallel entrance of the conveying track (40); When the telescopic rod of the tilting oil cylinder (6) moves to the maximum stroke, the hydraulic oil is delivered to the rodless cavity of the steering oil cylinder (5) through the medium-pressure pump (16), so that the square grass bale enters the conveying track (40); When the square straw bale enters the conveying track (40), the hydraulic oil is conveyed to the oil inlet of the straw bale conveying motor (1) through the high-pressure pump (15) to drive the conveying track (40), so that the square straw bale is output to the conveying track (40) for storage; When the square straw bales in the conveying track (40) are saturated, the bale clamping cylinder (3), the lower steering cylinder (4), the upper steering cylinder (5), and the turning cylinder (6) all stop working. When the square straw bales are unloaded and placed at a designated location, the medium-pressure pump (16) delivers hydraulic oil to the rodless chamber of the bale discharging cylinder (2), so that the bale discharging frame (44) is lifted and the bale discharging frame (44) reaches the pointing angle; When the bale discharging rack (44) reaches a specified angle, hydraulic oil is delivered to the oil inlet of the bale conveying motor (1) through the high-pressure pump (15), and the conveying track (40) operates to convey the square bale to the bale discharging rack (44), and the square bale falls from the bale discharging rack (44) to a specified position.

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