Hydraulic control system for a working machine and working machine

Abstract

This disclosure relates to a hydraulic control system for construction machinery and the construction machinery itself. The hydraulic control system includes a rotary rotor system, an air conditioning subsystem, and a control valve assembly. The hydraulic circuits of the rotary rotor system and the air conditioning subsystem are connected in parallel, and the first hydraulic motor and the second hydraulic motor share the same hydraulic power source. The control valve assembly is located between the hydraulic power source and the rotary rotor system, and between the hydraulic power source and the air conditioning subsystem, so that the hydraulic oil supplied by the hydraulic power source can be supplied to the air conditioning subsystem alone, or so that the hydraulic oil supplied by the hydraulic power source can be supplied to both the rotary rotor system and the air conditioning subsystem simultaneously. The hydraulic oil allocated to the air conditioning subsystem has a constant flow rate. Because the same hydraulic power source is used and the air conditioning subsystem and the rotary rotor system are connected in parallel, the hydraulic control system of this disclosure can solve the problem of rotational swaying and operator comfort caused by the opening and closing of the air conditioning subsystem during rotation. Furthermore, the hydraulic control system of this disclosure requires minimal space for installation.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic control system technology for construction machinery, specifically, to a hydraulic control system for construction machinery and construction machinery. Background Technology

[0002] Currently, the hydraulic control system of construction machinery generally includes an air conditioning subsystem and a rotary rotor system. The air conditioning subsystem is used to regulate the temperature inside the control room, while the rotary rotor system is used to control the rotation state of the construction machinery.

[0003] For air conditioning subsystems, there are generally three existing hydraulic control system layout methods: First, the air conditioning subsystem is connected in series in the control oil circuit of the rotary rotor system to achieve its operation. While this solution offers compact layout and low system cost, the opening and closing of the air conditioning subsystem impacts the rotary rotor system during operation, causing swaying during the rotation of the machinery. Second, in addition to the series connection between the air conditioning and rotary rotor systems, a pressure switch is added for electrical control, allowing the rotary rotor and air conditioning subsystems to operate independently, with the rotary rotor system taking priority. This solution addresses the impact of the air conditioning subsystem's operation on the rotary rotor system. However, when the rotary rotor system is operating, the air conditioning subsystem is off, making it impossible to adjust the ambient temperature inside the control room, affecting operational comfort. Third, a separate hydraulic power source is added for the air conditioning subsystem, controlling it separately from the rotary rotor system. While this effectively solves the swaying problem caused by the air conditioning subsystem's operation, it requires more space and increases system cost. Summary of the Invention

[0004] The purpose of this disclosure is to provide a hydraulic control system for engineering machinery and the engineering machinery itself. This hydraulic control system is beneficial in solving the problem of swaying and operator comfort caused by the opening and closing of the air conditioning subsystem during rotation. It also has the advantages of low cost and small space requirement.

[0005] To achieve the above objectives, according to one aspect of this disclosure, a hydraulic control system for engineering machinery is provided, the hydraulic control system comprising:

[0006] The rotary rotor system includes a first hydraulic motor for controlling the rotation of the construction machinery;

[0007] An air conditioning subsystem includes a second hydraulic motor for driving a compressor. The air conditioning subsystem is used to regulate the air temperature inside the control room of the construction machinery. The rotary rotor system is connected in parallel with the hydraulic oil circuit of the air conditioning subsystem, and the first hydraulic motor and the second hydraulic motor share the same hydraulic source.

[0008] A control valve assembly is disposed between the hydraulic source and the rotary rotor system, and between the hydraulic source and the air conditioning subsystem, so that the hydraulic oil provided by the hydraulic source can be supplied to the air conditioning subsystem alone, or so that the hydraulic oil provided by the hydraulic source can be supplied to both the rotary rotor system and the air conditioning subsystem simultaneously.

[0009] When the hydraulic oil supplied by the hydraulic source is supplied to both the rotary rotor system and the air conditioning subsystem, the hydraulic oil allocated to the air conditioning subsystem has a constant flow rate.

[0010] Optionally, the control valve assembly includes a compensation valve and a throttle valve. The compensation valve includes a first oil inlet, a first oil outlet, a second oil outlet, a first feedback oil outlet, and a second feedback oil outlet. The throttle valve includes a third oil inlet and a third oil outlet.

[0011] The first oil inlet is connected to the oil outlet of the hydraulic source, the first oil outlet is connected to the third oil inlet, the third oil outlet is connected to the air conditioning subsystem, and the second oil outlet is connected to the rotary rotor system.

[0012] The first feedback oil port is connected to the third oil inlet, and the second feedback oil port is connected to the third oil outlet.

[0013] Optionally, the control valve assembly further includes a first control valve and a first flow path, the two ends of the first flow path being used to communicate with the third oil outlet and the oil tank, respectively, and the first control valve being disposed on the first flow path to control the opening and closing of the first flow path.

[0014] Optionally, the control valve assembly further includes a first overflow valve and a second flow path, the two ends of the second flow path being used to communicate with the third oil outlet and the oil tank, respectively, and the first overflow valve is disposed on the second flow path.

[0015] Optionally, the hydraulic control system further includes a third flow path, the two ends of which are respectively used to communicate with the third oil outlet and the oil tank, and the second hydraulic motor is disposed on the third flow path.

[0016] Optionally, the control valve group includes a priority valve, a flow valve, and a directional valve. The priority valve includes a safety valve core, a fourth oil inlet, a fourth oil outlet, a fifth oil outlet, a third feedback oil outlet, and a fourth feedback oil outlet. The flow valve includes a sixth oil inlet and a sixth oil outlet. The directional valve includes a seventh oil inlet, a seventh oil outlet, an eighth oil outlet, and a return oil outlet.

[0017] The fourth oil inlet is connected to the oil outlet of the hydraulic source, the fourth oil outlet is connected to the sixth oil inlet, the sixth oil outlet is connected to the seventh oil inlet, the seventh oil outlet and the return oil outlet are both used to connect to the oil tank, and the eighth oil outlet is connected to the air conditioning subsystem.

[0018] The fifth oil outlet is connected to the rotary rotor system;

[0019] The third feedback port is connected to the sixth oil outlet, and the fourth feedback port is connected to the sixth oil inlet.

[0020] Optionally, the hydraulic control system further includes a second relief valve, the inlet of which is connected to the outlet of the hydraulic source, and the outlet of which is connected to the oil tank.

[0021] Optionally, the hydraulic control system further includes a return oil filter, the inlet of which is connected to the return rotor system, the seventh outlet, and the return oil port, respectively, and the outlet of which is connected to the oil tank.

[0022] Optionally, the rotary rotor system further includes a rotary reversing buffer valve, which is disposed on the oil line between the first hydraulic motor and the control valve assembly, and on the oil line between the first hydraulic motor and the oil tank.

[0023] According to another aspect of this disclosure, an engineering machine is provided, which includes the hydraulic control system of any of the above-described technical solutions.

[0024] Through the above technical solution, this disclosure utilizes a control valve group to divide hydraulic oil from the same hydraulic source into two paths. One path supplies the air conditioning subsystem to regulate the temperature inside the control room, while the other path supplies the rotary rotor system to enable the slewing operation of the construction machinery. Because a single hydraulic source is used, and the air conditioning and rotary rotor systems are connected in parallel, this hydraulic control system requires less space and reduces the number of oil circuits, thus saving space and reducing system costs. Furthermore, since the hydraulic source supplies a constant flow of hydraulic oil to the air conditioning subsystem, it ensures stable operation. During the slewing operation of the construction machinery, the rotary rotor system and the air conditioning subsystem will not interfere with each other. In other words, the opening and closing of the air conditioning subsystem will not affect the operation of the rotary rotor system during slewing. Therefore, the hydraulic control system of this disclosure can solve the problem of swaying and operator comfort caused by the opening and closing of the air conditioning subsystem during slewing, and it has low system cost and requires little space.

[0025] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a hydraulic control system according to an exemplary embodiment of the present disclosure, wherein the control valve group includes a compensation valve, a throttle valve, a control valve and a first relief valve;

[0028] Figure 2 This is a schematic diagram of the structure of a hydraulic control system according to an exemplary embodiment of the present disclosure, wherein the control valve group includes a priority valve, a flow valve and a directional valve;

[0029] Figure 3 yes Figure 2 A magnified view of the local structure at point A in the middle.

[0030] Explanation of reference numerals in the attached figures

[0031] 11-First hydraulic motor; 12-Reversing buffer valve; 21-Second hydraulic motor; 3-Hydraulic source; 4-Control valve assembly; 41-Compensation valve; 411-First oil inlet; 412-First oil outlet; 413-Second oil outlet; 414-First feedback oil port; 415-Second feedback oil port; 42-Throttle valve; 421-Third oil inlet; 422-Third oil outlet; 431-First control valve; 432-First flow path; 441-First relief valve; 442-Second flow path; 4 5-Third flow path; 46-Priority valve; 461-Safety valve core; 462-Fourth oil inlet; 463-Fourth oil outlet; 464-Fifth oil outlet; 465-Third feedback oil outlet; 466-Fourth feedback oil outlet; 47-Flow valve; 471-Sixth oil inlet; 472-Sixth oil outlet; 48-Directional control valve; 481-Seventh oil inlet; 482-Seventh oil outlet; 483-Eighth oil outlet; 484-Return oil outlet; 49-Second relief valve; 5-Oil tank; 6-Return oil filter. Detailed Implementation

[0032] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0033] In this disclosure, unless otherwise stated, terms such as “first,” “second,” and “third” are used only to distinguish multiple elements and do not have any order or importance.

[0034] like Figures 1 to 3As shown, according to one aspect of this disclosure, a hydraulic control system for construction machinery is provided. The hydraulic control system includes a rotary rotor system, an air conditioning subsystem, and a control valve assembly 4. The rotary rotor system includes a first hydraulic motor 11 for controlling the rotation of the construction machinery. The air conditioning subsystem includes a second hydraulic motor 21 for driving a compressor (not shown) and for regulating the air temperature in the operator's cab (not shown) of the construction machinery. The hydraulic circuits of the rotary rotor system and the air conditioning subsystem are connected in parallel, and the first hydraulic motor 11 and the second hydraulic motor 21 share the same hydraulic source 3. The control valve assembly 4 is disposed between the hydraulic source 3 and the rotary rotor system, and between the hydraulic source 3 and the air conditioning subsystem, such that the hydraulic oil supplied by the hydraulic source 3 can be supplied to the air conditioning subsystem alone, or that the hydraulic oil supplied by the hydraulic source 3 can be supplied to both the rotary rotor system and the air conditioning subsystem simultaneously. When the hydraulic oil supplied by the hydraulic source 3 is supplied to both the rotary rotor system and the air conditioning subsystem simultaneously, the hydraulic oil allocated to the air conditioning subsystem is at a constant flow rate.

[0035] Through the above technical solution, this disclosure utilizes control valve group 4 to divide hydraulic oil from the same hydraulic source 3 into two paths. One path supplies the air conditioning subsystem to regulate the temperature inside the control room, while the other path supplies the rotary rotor system to enable the slewing operation of the construction machinery. Because the same hydraulic source 3 is used, and the air conditioning subsystem and the rotary rotor system are connected in parallel, this hydraulic control system requires less space and reduces the number of oil circuits, thus saving space and reducing system costs. Furthermore, since the hydraulic source 3 supplies a constant flow of hydraulic oil to the air conditioning subsystem, the air conditioning subsystem can operate smoothly. During the slewing operation of the construction machinery, the rotary rotor system and the air conditioning subsystem will not interfere with each other. In other words, the opening and closing of the air conditioning subsystem will not interfere with the operation of the rotary rotor system during the slewing process. Thus, the hydraulic control system of this disclosure can solve the problem of swaying and operator comfort caused by the opening and closing of the air conditioning subsystem during slewing, and has the advantages of low cost and small space requirement.

[0036] The control valve assembly 4 disclosed herein has various embodiments. For example, such as Figure 1As shown in an exemplary embodiment of this disclosure, the control valve assembly 4 may include a compensation valve 41 and a throttle valve 42. The compensation valve 41 includes a first inlet 411, a first outlet 412, a second outlet 413, a first feedback port 414, and a second feedback port 415. The throttle valve 42 includes a third inlet 421 and a third outlet 422. The first inlet 411 is connected to the outlet of the hydraulic source 3, the first outlet 412 is connected to the third inlet 421, the third outlet 422 is connected to the air conditioning subsystem, and the second outlet 413 is connected to the rotary rotor system. The first feedback port 414 is connected to the third inlet 421, and the second feedback port 415 is connected to the third outlet 422.

[0037] In the above embodiment, the compensation valve 41 is disposed between the throttle valve 42 and the hydraulic source 3, forming a pressure compensation valve 41. This valve ensures that the hydraulic oil flowing out of the throttle valve 42 is maintained at a set flow rate, meaning that the flow rate of hydraulic oil supplied to the air conditioning subsystem from the third outlet 422 is constant. This allows the air conditioning subsystem to operate stably. Furthermore, the second outlet 413 of the compensation valve 41 is connected to the rotary rotor system. This causes the hydraulic oil flowing out of the hydraulic source 3 to be divided into two paths. One path supplies the air conditioning subsystem with a constant flow rate, while the other path (the remaining hydraulic oil after meeting the needs of the air conditioning subsystem) supplies the rotary rotor system from the second outlet 413. This ensures the rotary rotor system can operate normally, and the two systems do not interfere with each other. This also allows the air conditioning subsystem to operate stably and continuously regulate the temperature inside the control room during the rotation of the construction machinery (i.e., when the rotary rotor system is working).

[0038] Furthermore, the working principle of the compensating valve 41 and the throttle valve 42 jointly maintaining the hydraulic oil supplied to the air conditioning subsystem from the third outlet 422 at a constant flow rate is as follows: the compensating valve keeps the pressure difference between the valve inlet and outlet of the throttle valve 42 approximately at the pressure calculated by the compression of the spring in the compensating valve, thus keeping the flow rate of the throttle valve 42 essentially constant. Specifically, the hydraulic oil in the first feedback port 414 connected to the third inlet port 421 of the throttle valve 42 acts on the left end of the compensating valve 41, and the hydraulic oil in the second feedback port 415 connected to the third outlet port 422 of the throttle valve 42 acts on the right end of the compensating valve 41, thereby maintaining the pressure difference between the valve inlet and outlet of the throttle valve 42 at a constant pressure calculated by the compression of the spring in the compensating valve 41. In this way, the hydraulic oil supplied to the air conditioning subsystem from the third outlet port 422 of the throttle valve 42 maintains a constant flow rate.

[0039] In one embodiment of this disclosure, the control valve assembly 4 (including a compensation valve 41 and a throttle valve 42) of the above-mentioned technical solution may further include a first control valve 431 and a first flow path 432. The two ends of the first flow path 432 are respectively used to communicate with the third oil outlet 422 and the oil tank 5. The first control valve 431 is disposed on the first flow path 432 to control the opening and closing of the first flow path 432. In this way, the first control valve 431 forms a parallel relationship with the air conditioning subsystem. When the air conditioning subsystem is not working, the first control valve 431 can be opened, so that the hydraulic oil flowing out of the third oil outlet 422 returns directly to the oil tank 5 through the first control valve 431 and along the first flow path 432. In this way, when the air conditioning subsystem is not working, the hydraulic oil flowing out of the third oil outlet 422 can quickly return to the oil tank 5, and the oil return structure is simple and efficient.

[0040] It is understood that the first control valve 431 of this disclosure has multiple implementations. For example, in one implementation, the first control valve 431 can be configured as a normally open direct-acting solenoid valve, which is electrically connected to the control system of the air conditioning subsystem. Its working principle / process is as follows: when the air conditioning subsystem is not working, the solenoid valve opens due to de-energization, and the hydraulic oil flowing from the third oil outlet 422 passes through the solenoid valve and returns directly to the oil tank 5 along the first flow path 432. When the air conditioning subsystem is working, the solenoid valve closes due to energization, and the hydraulic oil flowing from the third oil outlet 422 enters the second hydraulic motor 21, enabling the air conditioning subsystem to operate normally. In another implementation of this disclosure, the first control valve 431 can be an electric valve, which is electrically connected to the control system of the air conditioning subsystem. Its working principle / process is as follows: when the air conditioning subsystem is not working, the electric control valve opens, and the hydraulic oil flowing from the third oil outlet 422 passes through the electric valve and returns directly to the oil tank 5 along the first flow path 432. When the air conditioning subsystem is working, the control electric valve closes, and the hydraulic oil flowing from the third oil outlet 422 enters the second hydraulic motor 21, enabling the air conditioning subsystem to operate normally. This disclosure does not impose specific limitations on the structure of the first control valve 431.

[0041] In one embodiment of this disclosure, the control valve assembly 4 (including a compensation valve 41 and a throttle valve 42) of the above-mentioned technical solution may further include a first relief valve 441 and a second flow path 442. The two ends of the second flow path 442 are respectively connected to a third oil outlet 422 and an oil tank 5. The first relief valve 441 is disposed on the second flow path 442. When the hydraulic oil pressure at the third oil outlet 422 exceeds the limit, the first relief valve 441 opens to overflow the hydraulic oil at that location, which can prevent accidents caused by overload in the hydraulic lines or hydraulic system of the air conditioning subsystem. In other words, the first relief valve 441 can ensure the safe operation of the air conditioning subsystem, thereby improving the safety of the engineering machinery production process.

[0042] In one embodiment of this disclosure, the hydraulic control system of the above-described technical solution may further include a third flow path 45, with its two ends connected to a third oil outlet 422 and an oil tank 5, respectively. A second hydraulic motor 21 is disposed on the third flow path 45. The second hydraulic motor 21 is directly disposed on the third flow path 45 and connected to the third oil outlet 422. This simplifies the oil supply structure of the air conditioning subsystem, allowing the hydraulic oil flowing from the third oil outlet 422 to flow directly into the second hydraulic motor 21 of the air conditioning subsystem, thereby reducing hydraulic oil flow loss and energy consumption.

[0043] like Figure 2 and Figure 3 As shown, in another exemplary embodiment of this disclosure, another specific structure of the control valve assembly 4 is also provided. The control valve assembly 4 of this disclosure may include a priority valve 46, a flow valve 47, and a directional valve 48. The priority valve 46 includes a safety valve core 461, a fourth oil inlet 462, a fourth oil outlet 463, a fifth oil outlet 464, a third feedback oil outlet 465, and a fourth feedback oil outlet 466. The flow valve 47 includes a sixth oil inlet 471 and a sixth oil outlet 472. The directional valve 48 includes a seventh oil inlet 481, a seventh oil outlet 482, an eighth oil outlet 483, and a return oil outlet 484. The fourth oil inlet 462 is connected to the oil outlet of the hydraulic source 3, the fourth oil outlet 463 is connected to the sixth oil inlet 471, the sixth oil outlet 472 is connected to the seventh oil inlet 481, the seventh oil outlet 482 and the return oil outlet 484 are both used to connect to the oil tank 5, and the eighth oil outlet 483 is connected to the air conditioning subsystem. The fifth oil outlet 464 is connected to the return rotor system. The third feedback oil outlet 465 is connected to the sixth oil outlet 472, and the fourth feedback oil outlet 466 is connected to the sixth oil inlet 471.

[0044] In this embodiment, the hydraulic oil flowing from the hydraulic source 3 is divided into two paths by the priority valve 46. One path supplies the air conditioning subsystem with a constant flow rate through the flow valve 47 and the reversing valve 48. The other path (i.e., the remaining hydraulic oil after meeting the needs of the air conditioning subsystem) supplies the rotary rotor system from the fifth outlet 464, ensuring the normal operation of the rotary rotor system and preventing any mutual interference between the two systems. This allows the air conditioning subsystem to operate stably and continuously regulate the temperature inside the control room during the rotation of the construction machinery (i.e., when the rotary rotor system is working).

[0045] Furthermore, in this embodiment, the air conditioning subsystem and the rotary rotor system do not interfere with each other. When the air conditioning subsystem is not operating, the hydraulic oil flowing through the flow valve 47 returns directly to the oil tank 5. The pressure of the hydraulic oil in the third feedback port 465, connected to the sixth outlet 472, is approximately zero. The hydraulic oil in the fourth feedback port 466, connected to the sixth inlet 471, still has a certain pressure and acts on the right end of the valve core of the priority valve 46, causing the valve core to move to the left. At this time, the priority valve 46 divides the hydraulic oil from the hydraulic source 3 into two paths. One path, with a constant flow rate, returns the hydraulic oil to the oil tank 5 via the flow valve 47 and the reversing valve 48. The other path supplies the rotary rotor system from the fifth outlet 464, enabling the rotary rotor system to operate normally. Therefore, under these conditions, the air conditioning subsystem and the rotary rotor system do not interfere with each other. When the air conditioning subsystem is operating, the pressure of the hydraulic oil in the third feedback port 465, which is connected to the sixth oil outlet 472, is not zero and acts on the left end of the priority valve 46, causing the valve core of the priority valve 46 to move to the right. At this time, the priority valve 46 divides the hydraulic oil from the hydraulic source 3 into two paths. One path, with a constant flow rate, supplies the air conditioning subsystem via the flow valve 47 and the reversing valve 48. The other path supplies the rotary rotor system from the fifth oil outlet 464, allowing the air conditioning subsystem and the rotary rotor system to operate independently. Therefore, the air conditioning subsystem and the rotary rotor system will not interfere with each other under this condition.

[0046] like Figure 2 As shown, in one embodiment of this disclosure, based on the aforementioned control valve group 4 (including a priority valve 46, a flow valve 47, and a directional valve 48), the hydraulic control system of this disclosure may further include a second relief valve 49. The inlet of the second relief valve 49 is connected to the outlet of the hydraulic source 3, and the outlet of the second relief valve 49 is connected to the oil tank 5. When the pressure of the hydraulic oil at the outlet of the hydraulic source 3 exceeds a limit, the second relief valve 49 opens to overflow the hydraulic oil at that location, preventing accidents caused by overload in the hydraulic pipelines or hydraulic system of the entire hydraulic control system. In other words, the second relief valve 49 ensures the safe operation of the entire hydraulic control system, improving safety during the production process of engineering machinery.

[0047] like Figure 2As shown, in one embodiment of this disclosure, based on the aforementioned control valve group 4 (including priority valve 46, flow valve 47, and directional valve 48), the hydraulic control system of this disclosure may further include a return oil filter 6. The inlet of the return oil filter 6 is connected to the return rotor system, the seventh outlet 482, and the return port 484, respectively, and the outlet of the return oil filter 6 is connected to the oil tank 5. By installing the return oil filter 6 on the return oil line at the end of the hydraulic control system, the hydraulic oil flowing through the entire hydraulic control system can be purified. Metal particles generated by wear in the hydraulic system or impurities and contaminants generated by friction or impact of related seals can be filtered out by the return oil filter 6 before the hydraulic oil returns to the oil tank 5, thus maintaining a certain level of cleanliness in the hydraulic oil returning to the oil tank 5.

[0048] like Figure 1 and Figure 2 As shown, in one embodiment of this disclosure, the rotary rotor system may further include a rotary reversing buffer valve 12. The rotary reversing buffer valve 12 is disposed on the oil line between the first hydraulic motor 11 and the control valve assembly 4, and on the oil line between the first hydraulic motor 11 and the oil tank 5. The rotary reversing buffer valve 12 is a symmetrical bidirectional balance valve. High-pressure oil on the inlet side is supplied to the first hydraulic motor 11 via a check valve, and simultaneously acts on the pressure valve core on the return side via an internal oil passage. This causes the left-side spring force of the pilot piston to overcome the right-side spring force, thereby opening the pressure valve core on the return side and achieving a balance buffering function. Furthermore, the hydraulic oil of the first hydraulic motor 11 simultaneously acts on the pressure valve core on the inlet side. When the first hydraulic motor 11 starts, the pressure valve core on the inlet side acts as a pressure limiting valve, restricting its starting torque. When the first hydraulic motor 11 stops, the pressure valve core on the return side acts as a buffer valve, absorbing impact pressure. This provides both sufficiently high starting torque and a relatively good buffering braking effect.

[0049] According to another aspect of this disclosure, an engineering machine is provided, which includes the hydraulic control system of any of the above-described technical solutions.

[0050] It is understood that the construction machinery referred to in this disclosure is any type of construction machinery with an air conditioning subsystem and a slewing system. For example, it can be a hydraulic crane, a hydraulic excavator, a slewing hydraulic forklift, etc. Taking a hydraulic crane as an example, when it uses the hydraulic control system of this disclosure, the air conditioning in its upper control cab can be used separately from the crane's slewing device, thus preventing swaying during slewing.

[0051] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0052] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0053] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A hydraulic control system for engineering machinery, characterized in that, include: The rotary rotor system includes a first hydraulic motor for controlling the rotation of the construction machinery; An air conditioning subsystem includes a second hydraulic motor for driving a compressor. The air conditioning subsystem is used to regulate the air temperature inside the control room of the construction machinery. The rotary rotor system is connected in parallel with the hydraulic oil circuit of the air conditioning subsystem, and the first hydraulic motor and the second hydraulic motor share the same hydraulic source. A control valve assembly is disposed between the hydraulic source and the rotary rotor system, and between the hydraulic source and the air conditioning subsystem, so that the hydraulic oil provided by the hydraulic source can be supplied to the air conditioning subsystem alone, or so that the hydraulic oil provided by the hydraulic source can be supplied to both the rotary rotor system and the air conditioning subsystem simultaneously. Wherein, when the hydraulic oil supplied by the hydraulic source is simultaneously supplied to the rotary rotor system and the air conditioning subsystem, the hydraulic oil allocated to the air conditioning subsystem has a constant flow rate; The control valve group includes a compensation valve and a throttle valve. The compensation valve includes a first oil inlet, a first oil outlet, a second oil outlet, a first feedback oil outlet, and a second feedback oil outlet. The throttle valve includes a third oil inlet and a third oil outlet. The first oil inlet is connected to the oil outlet of the hydraulic source, the first oil outlet is connected to the third oil inlet, the third oil outlet is connected to the air conditioning subsystem, and the second oil outlet is connected to the rotary rotor system. The first feedback oil port is connected to the third oil inlet, and the second feedback oil port is connected to the third oil outlet.

2. The hydraulic control system according to claim 1, characterized in that, The control valve assembly further includes a first control valve and a first flow path. The two ends of the first flow path are respectively used to communicate with the third oil outlet and the oil tank. The first control valve is disposed on the first flow path to control the opening and closing of the first flow path.

3. The hydraulic control system according to claim 1, characterized in that, The control valve assembly further includes a first overflow valve and a second flow path. The two ends of the second flow path are respectively used to communicate with the third oil outlet and the oil tank. The first overflow valve is disposed on the second flow path.

4. The hydraulic control system according to claim 1, characterized in that, The hydraulic control system further includes a third flow path, the two ends of which are respectively used to communicate with the third oil outlet and the oil tank, and the second hydraulic motor is disposed on the third flow path.

5. The hydraulic control system according to any one of claims 1-4, characterized in that, The rotary rotor system also includes a rotary reversing buffer valve, which is installed in the oil line between the first hydraulic motor and the control valve group, and in the oil line between the first hydraulic motor and the oil tank.

6. A hydraulic control system for engineering machinery, characterized in that, include: The rotary rotor system includes a first hydraulic motor for controlling the rotation of the construction machinery; An air conditioning subsystem includes a second hydraulic motor for driving a compressor. The air conditioning subsystem is used to regulate the air temperature inside the control room of the construction machinery. The rotary rotor system is connected in parallel with the hydraulic oil circuit of the air conditioning subsystem, and the first hydraulic motor and the second hydraulic motor share the same hydraulic source. A control valve assembly is disposed between the hydraulic source and the rotary rotor system, and between the hydraulic source and the air conditioning subsystem, so that the hydraulic oil provided by the hydraulic source can be supplied to the air conditioning subsystem alone, or so that the hydraulic oil provided by the hydraulic source can be supplied to both the rotary rotor system and the air conditioning subsystem simultaneously. Wherein, when the hydraulic oil supplied by the hydraulic source is simultaneously supplied to the rotary rotor system and the air conditioning subsystem, the hydraulic oil allocated to the air conditioning subsystem has a constant flow rate; The control valve group includes a priority valve, a flow valve, and a directional valve. The priority valve includes a safety valve core, a fourth oil inlet, a fourth oil outlet, a fifth oil outlet, a third feedback oil outlet, and a fourth feedback oil outlet. The flow valve includes a sixth oil inlet and a sixth oil outlet. The directional valve includes a seventh oil inlet, a seventh oil outlet, an eighth oil outlet, and a return oil outlet. The fourth oil inlet is connected to the oil outlet of the hydraulic source, the fourth oil outlet is connected to the sixth oil inlet, the sixth oil outlet is connected to the seventh oil inlet, the seventh oil outlet and the return oil outlet are both used to connect to the oil tank, and the eighth oil outlet is connected to the air conditioning subsystem. The fifth oil outlet is connected to the rotary rotor system; The third feedback port is connected to the sixth oil outlet, and the fourth feedback port is connected to the sixth oil inlet.

7. The hydraulic control system according to claim 6, characterized in that, The hydraulic control system further includes a second relief valve, the oil inlet of which is connected to the oil outlet of the hydraulic source, and the oil outlet of the second relief valve is used to connect to the oil tank.

8. The hydraulic control system according to claim 6, characterized in that, The hydraulic control system also includes a return oil filter, the inlet of which is connected to the return rotor system, the seventh outlet, and the return oil port, and the outlet of which is connected to the oil tank.

9. The hydraulic control system according to any one of claims 6-8, characterized in that, The rotary rotor system also includes a rotary reversing buffer valve, which is installed in the oil line between the first hydraulic motor and the control valve group, and in the oil line between the first hydraulic motor and the oil tank.

10. An engineering machinery, characterized in that, It includes a hydraulic control system according to any one of claims 1-5, or, it includes a hydraulic control system according to any one of claims 6-9.

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