Watering cart hydraulic control system capable of automatically adapting to watering amount

Abstract

The invention discloses a watering cart hydraulic control system self-adaptive to watering quantity, which belongs to the technical field of watering carts and comprises a pump body and an oil tank, the oil tank is communicated with the input end of the pump body, the output end of the pump body is communicated with a hydraulic oil pipe II through a hydraulic oil pipe I, and the other end of the hydraulic oil pipe II is connected with a steering gear and a steering oil cylinder. One side of the hydraulic oil pipe II is further communicated with a hydraulic oil pipe III, the other end of the hydraulic oil pipe III is connected with a water spraying hydraulic motor of the watering cart through a control oil pipe, a logic valve is installed on the control oil pipe, and hydraulic oil flowing to the hydraulic motor can be output to the hydraulic motor only after being pressurized when passing through the logic valve. The water spraying device has the advantages that the purpose of prolonging the water spraying time is achieved, cost is saved, and reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of sprinkler truck technology, specifically to a hydraulic control system for sprinkler trucks that adapts to the amount of water sprayed. Background Technology

[0002] Mining sprinkler trucks have limited water capacity. When driving on straight roads, the sprinkler truck travels at a high speed and sprays a large area per unit time, requiring a large amount of water. However, when driving on curves, the speed is slow and the area sprayed per unit time is small. If the amount of water sprayed can be precisely controlled according to the road conditions on curves, every liter of water in the tank can be used efficiently, reducing the number of times the sprinkler truck needs to be dispatched and providing greater economic benefits.

[0003] Most existing mining sprinkler trucks use hydraulic motors to drive water pumps. They cannot automatically control the amount of water sprayed based on road conditions. Adding a dedicated control system would significantly increase costs for controller wiring harnesses and sensors. Summary of the Invention

[0004] The present invention aims to solve the technical problems mentioned in the background section above, and provides a hydraulic control system for a sprinkler truck that can reduce the amount of water sprayed when the vehicle turns, without increasing the control cost significantly.

[0005] According to the present invention, the technical solution provided by the present invention is as follows: a hydraulic control system for a sprinkler truck with adaptive water volume, comprising a pump body and an oil tank, the oil tank being connected to the input end of the pump body, the output end of the pump body being connected to hydraulic oil pipe II via hydraulic oil pipe I, the other end of hydraulic oil pipe II being connected to a steering gear and a steering cylinder, one side of hydraulic oil pipe II being connected to hydraulic oil pipe III, the other end of hydraulic oil pipe III being connected to the water spraying hydraulic motor of the sprinkler truck via a control oil pipe, a logic valve being installed on the control oil pipe, the hydraulic oil flowing to the hydraulic motor needing to be pressurized when passing through the logic valve before being output to the hydraulic motor.

[0006] In some embodiments, a directional valve is also installed on the control oil line between the logic valve and the hydraulic motor. The directional valve is used to control the opening and closing of the oil circuit to the hydraulic motor and to reverse the direction of the oil flow.

[0007] In some embodiments, hydraulic pipe II is also connected to hydraulic pipe IV on one side, a pressure reducing valve is installed on hydraulic pipe IV, and a pilot directional valve assembly is also installed on one side of hydraulic pipe IV. The other end of the pilot directional valve assembly is connected to the pilot port of the directional valve.

[0008] In some embodiments, the pressure reducing valve is rated at 35 bar.

[0009] In some embodiments, the pilot-operated directional valve assembly includes a first directional valve and a second directional valve. The first directional valve is a two-position solenoid directional valve. The first working position of the first directional valve is connected to the hydraulic oil pipe IV and one end of the pilot port of the directional valve. The second working position of the first directional valve is connected to one end of the pilot port of the directional valve and the oil tank. The second directional valve is a two-position solenoid directional valve. The first working position of the second directional valve is connected to the hydraulic oil pipe IV and the other pilot port of the directional valve. The second working position of the second directional valve is connected to the other pilot port of the directional valve and the oil tank.

[0010] In some embodiments, the steering gear is a load-sensitive steering gear, and the steering gear is provided with an overflow hydraulic pipe that connects to the directional valve. The hydraulic oil overflowing from the steering gear enters the hydraulic motor through the overflow hydraulic pipe and the directional valve.

[0011] In some embodiments, the logic valve is rated for a pressure of 15 bar.

[0012] In some embodiments, the directional valve is a multi-position directional valve, and the oil inlet end of the directional valve is provided with an oil inlet from the logic valve and the overflow hydraulic pipe; The first working position of the directional valve connects one side of the logic valve and the hydraulic motor; The second working position of the directional valve disconnects the oil circuit to the hydraulic motor; The third working position of the directional valve connects the overflow hydraulic pipe and one side of the hydraulic motor; The third working position of the directional valve connects the logic valve and the other side of the hydraulic motor.

[0013] In some embodiments, the pump body is a load-sensitive plunger pump.

[0014] In some embodiments, a check valve is installed on hydraulic oil pipe I, which only allows hydraulic oil to flow from the pump body to hydraulic oil pipe II.

[0015] The advantages of this invention compared to the prior art are: 1. By adding a pressure reducing valve, a pilot directional valve group, and a logic valve, the hydraulic motor speed is reduced during steering, thereby reducing the amount of water sprayed; 2. The hydraulic motor speed can be controlled according to road conditions without relying on sensor elements, thereby controlling the amount of water sprayed.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a hydraulic system according to an embodiment of the present invention.

[0018] In the attached diagram: 1. Load-sensitive piston pump; 2. Main valve; 3. Steering cylinder; 4. Load-sensitive steering gear; 5. Pressure reducing valve; 6. Pilot-operated directional valve assembly; 7. Hydraulic motor; 8. Directional valve; 9. Logic valve; 10. Oil tank; 11. Hydraulic oil pipe I; 12. Hydraulic oil pipe II; 13. Hydraulic oil pipe III; 14. Hydraulic oil pipe IV; 15. Control oil pipe; 16. Overflow hydraulic pipe. Detailed Implementation

[0019] The present invention will now be described in further detail.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Combination Figure 1 As shown, in this embodiment, the hydraulic control system of the sprinkler truck with adaptive water volume has a load-sensitive plunger pump 1, a load-sensitive steering gear 4, a pressure reducing valve 5 with a rated pressure of 35 bar, and a logic valve 9 with a rated pressure of 15 bar.

[0022] The oil tank 10 is connected to the input end of the pump body, and the output end of the pump body is connected to the steering cylinder 3 and the water spraying hydraulic motor 7 of the sprinkler truck through the hydraulic oil pipe I11 and the main valve 2.

[0023] The main valve 2 mainly includes a pressure reducing valve 5, a pilot directional valve group 6, a directional valve 8, and a logic valve 9. Hydraulic oil pipe I 11 is connected to hydraulic oil pipe II 12. The upper end of hydraulic oil pipe II 12 is connected to a steering gear and a steering cylinder 3. Hydraulic oil pipe III 13 and hydraulic oil pipe IV 14 are also connected in parallel on the right side of hydraulic oil pipe II 12. The other end of hydraulic oil pipe III 13 is connected to the water spraying hydraulic motor 7 of the sprinkler truck through a control oil pipe 15. A logic valve 9 is installed on the control oil pipe 15. The hydraulic oil flowing to the hydraulic motor 7 needs to be pressurized when it passes through the logic valve 9 before it can be output to the hydraulic motor 7. A directional valve 8 is also installed on the control oil pipe 15 between the logic valve 9 and the hydraulic motor 7. The directional valve 8 is used to control the opening and closing of the oil circuit of the hydraulic motor 7 and the reversal.

[0024] A pressure reducing valve 5 is installed on the hydraulic oil pipe IV14. A pilot directional valve assembly 6 is also installed on the upper side of the hydraulic oil pipe IV14. The pilot directional valve assembly 6 includes a first directional valve (upper) and a second directional valve (lower).

[0025] The first directional valve is a two-position three-way solenoid directional valve. The first working position (left working position) of the first directional valve is connected to the hydraulic oil pipe IV14 and the lower pilot port of the directional valve 8. The second working position (right working position) of the first directional valve is connected to the lower pilot port of the directional valve 8 and the oil tank 10. The second directional valve is a two-position three-way solenoid directional valve. The first working position (left working position) of the second directional valve is connected to the upper pilot port of the hydraulic oil pipe IV14 and the directional valve 8. The second working position (right working position) of the second directional valve is connected to the upper pilot port of the directional valve 8 and the oil tank 10.

[0026] The steering gear is equipped with an overflow hydraulic pipe 16, which is connected to the left oil inlet of the directional valve 8. The hydraulic oil overflowing from the steering gear enters the hydraulic motor 7 through the overflow hydraulic pipe 16 and the directional valve 8.

[0027] like Figure 1 As shown, the directional valve 8 is a four-position seven-way directional valve. The oil inlet of the directional valve 8 is provided with an oil inlet from the logic valve 9 and the overflow hydraulic pipe 16. There are three oil inlets, which are from top to bottom: an oil inlet from the overflow hydraulic pipe 16, an oil inlet from the logic valve 9, and another oil inlet from the overflow hydraulic pipe 16.

[0028] The first working position of the directional valve 8 connects the logic valve 9 and the right oil inlet of the hydraulic motor 7; The second working position of the directional valve 8 disconnects the oil circuit to the hydraulic motor 7; The third working position of the directional valve 8 connects the overflow hydraulic pipe 16 and the right oil inlet of the hydraulic motor 7; The third working position of directional valve 8 connects to the left oil inlet of logic valve 9 and hydraulic motor 7.

[0029] In practical use, the hydraulic control system of the sprinkler truck with adaptive water volume in this embodiment is as follows: The oil in the load-sensitive plunger pump 1 needs to be pressurized by 15 bar through the logic valve 9 before it can be output to the hydraulic motor 7, and the input pressure of the hydraulic motor 7 is always higher than the input pressure of the steering cylinder 3 by 15 bar.

[0030] The effect is that when the direction is turned, the hydraulic oil output by the load-sensitive piston pump 1 will be prioritized to the steering cylinder 3, and the excess oil will be given to the hydraulic motor 7.

[0031] The load-sensitive piston pump 1 provides appropriate pressure and flow rate based on feedback from various working components. By setting the pump's maximum displacement, it ensures that when the steering cylinder 3 outputs maximum flow, the hydraulic motor 7, although experiencing a reduced flow rate, still maintains a certain speed. This manifests as a decrease in the speed of the hydraulic motor 7 and a corresponding reduction in the water pump's pumping volume.

[0032] There are three operating conditions during vehicle operation that require a reduction in water spraying: 1. During normal driving, the deceleration before turning causes the maximum flow rate of the load-sensitive plunger pump 1 to decrease, and the motor speed to decrease.

[0033] 2. When starting to turn, the vehicle speed decreases, the load-sensitive plunger pump 1 supplies oil to the steering cylinder 3, the speed of the hydraulic motor 7 decreases, and the water pump reduces the amount of water pumped.

[0034] 3. When the steering wheel is about to be returned to its original position, the load-sensitive plunger pump 1 supplies oil to the steering cylinder 3, the speed of the hydraulic motor 7 decreases, and the water pump reduces the amount of water pumped.

[0035] The three operating conditions basically ensure that the amount of water sprayed is reduced when the vehicle speed decreases due to steering.

[0036] Furthermore, the water spraying volume will vary depending on whether the road conditions are sharp bends (higher turning flow and lower water spraying volume) or gentle bends (lower turning flow and higher water spraying volume), thus achieving precise control of the water spraying volume.

[0037] As can be seen from the above results, the hydraulic control system of the sprinkler truck with adaptive water volume in this embodiment, through a load-sensitive steering priority system, efficiently utilizes the water in the tank to extend the sprinkling time. Furthermore, no additional sensors or controllers are required; the effect is achieved solely through the hydraulic system's functionality. This saves costs and increases reliability.

[0038] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydraulic control system for a self-adapting water volume sprinkler truck, characterized by: The invention relates to a hydraulic system of a water spraying vehicle, comprising a pump body and an oil tank (10) which is connected to the input end of the pump body, the output end of the pump body is connected to a hydraulic oil pipe I (11) which is connected to a hydraulic oil pipe II (12), the other end of the hydraulic oil pipe II (12) is connected to a steering gear and a steering cylinder (3), one side of the hydraulic oil pipe II (12) is also connected to a hydraulic oil pipe III (13), the other end of the hydraulic oil pipe III (13) is connected to a water spraying hydraulic motor (7) of the water spraying vehicle through a control oil pipe (15), a logic valve (9) is installed on the control oil pipe (15), the hydraulic oil flowing to the hydraulic motor (7) needs to be pressurized before being output to the hydraulic motor (7) when passing through the logic valve (9).

2. The self-adapting water volume sprinkling truck hydraulic control system according to claim 1, characterized in that: A directional valve (8) is also installed on the control oil pipe (15) between the logic valve (9) and the hydraulic motor (7), the directional valve (8) is used to control the on-off and reversing of the oil path of the hydraulic motor (7).

3. The self-adapting water volume sprinkling truck hydraulic control system according to claim 2, characterized in that: One side of the hydraulic oil pipe II (12) is also connected to a hydraulic oil pipe IV (14), a pressure reducing valve (5) is installed on the hydraulic oil pipe IV (14), one side of the hydraulic oil pipe IV (14) is also installed with a pilot reversing valve group (6), the other end of the pilot reversing valve group (6) is connected to the pilot port of the directional valve (8).

4. The self-adapting water volume sprinkling truck hydraulic control system according to claim 3, characterized in that: The rated pressure of the pressure reducing valve (5) is 35 bar.

5. The self-adapting water volume sprinkling truck hydraulic control system according to claim 3, characterized in that: The pilot reversing valve group (6) comprises a first reversing valve and a second reversing valve, The first reversing valve is a two-position electromagnetic reversing valve, the first working position of the first reversing valve is connected to the hydraulic oil pipe IV (14) and one end of the pilot port of the directional valve (8), the second working position of the first reversing valve is connected to one end of the pilot port of the directional valve (8) and the oil tank (10); The second reversing valve is a two-position electromagnetic reversing valve, the first working position of the second reversing valve is connected to the hydraulic oil pipe IV (14) and the other end of the pilot port of the directional valve (8), the second working position of the second reversing valve is connected to the other end of the pilot port of the directional valve (8) and the oil tank (10).

6. The self-adapting water volume sprinkler truck hydraulic control system according to claim 1, characterized in that: The steering gear is a load-sensitive steering gear (4), the steering gear is provided with an overflow hydraulic pipe (16), the overflow hydraulic pipe (16) is connected to the directional valve (8), the hydraulic oil overflowing from the steering gear enters the hydraulic motor (7) through the overflow hydraulic pipe (16) and the directional valve (8).

7. The self-adapting water volume sprinkler truck hydraulic control system according to claim 1, wherein: The rated pressure of the logic valve (9) is 15 bar.

8. The self-adapting water volume sprinkler truck hydraulic control system according to claim 6, characterized in that: The directional valve (8) is a multi-position reversing valve, the oil inlet end of the directional valve (8) is provided with oil inlet ports from the logic valve (9) and the overflow hydraulic pipe (16); The first working position of the directional valve (8) is connected to the logic valve (9) and one side of the hydraulic motor (7); The second working position of the directional valve (8) disconnects the oil path leading to the hydraulic motor (7); The third working position of the directional valve (8) is connected to the overflow hydraulic pipe (16) and one side of the hydraulic motor (7); The third working position of the directional valve (8) is connected to the logic valve (9) and the other side of the hydraulic motor (7).

9. The self-adapting water volume sprinkler truck hydraulic control system according to claim 1, characterized in that: The pump body is a load-sensitive plunger pump (1).

10. The self-adapting water volume sprinkler truck hydraulic control system according to claim 1, characterized in that: A one-way valve is installed on the hydraulic oil pipe I (11), the one-way valve only allows the hydraulic oil to flow from the pump body to the hydraulic oil pipe II (12).

Images