A machine rotation system and control method with auxiliary heat dissipation

Abstract

This invention discloses a machine slewing system and control method with auxiliary heat dissipation. The input end of the PTO device is connected to the power take-off port of the engine or main pump, and the output end of the PTO device drives the rotation of a variable displacement piston pump. The inlet of the variable displacement piston pump draws oil from the hydraulic oil tank, and the outlet of the variable displacement piston pump is connected to the P port of the reversing valve assembly. The reversing valve assembly, according to the control signal output by the controller, redirects the hydraulic oil to the slewing attachment and then back to the hydraulic oil tank via the radiator, or redirects the hydraulic oil to the radiator and back to the hydraulic oil tank. The controller receives signals from the instruments, control handle, and oil temperature sensor, performs mode judgment, and outputs corresponding control signals to the variable displacement piston pump and the reversing valve assembly. This invention achieves on-demand flow supply, improving the adaptability of the machine; it provides auxiliary heat dissipation, effectively reducing the risk of high hydraulic oil temperature. It meets the machine's slewing requirements while accelerating hydraulic oil circulation, achieving an auxiliary heat dissipation effect.

Description

Technical Field

[0001] This invention relates to a machine slewing system and control method that can assist in heat dissipation, belonging to the technical field of excavator hydraulic systems and control methods. Background Technology

[0002] Construction machinery equipped with implement slewing systems, such as excavators, are among the most widely used construction machinery products. Besides conventional digging and loading operations, they often require various special attachments to meet diverse working conditions and enhance their versatility. Especially in Europe, America, and Australia, multi-functional implement hydraulic systems have become standard equipment on excavators. Excavators equipped with multi-functional implement hydraulic systems allow customers to change attachments such as hydraulic breakers, rotary hydraulic shears, and rotary clamshell buckets according to actual work needs, achieving multi-purpose functionality and greatly improving the excavator's adaptability and work efficiency.

[0003] Currently, the hydraulic systems for multi-functional excavators in Europe, America, and Australia mainly consist of two hydraulic piping systems: one for tool opening / closing and the other for tool rotation. The tool opening / closing system can be reused as a breaker hydraulic system via a one-way / two-way switching valve, and also has flow and pressure regulation functions. The tool rotation hydraulic system utilizes a PTO (Power Take-Off) device to directly obtain power from the main pump or engine power take-off, creating a tool rotation system independent of the excavator's main hydraulic system.

[0004] The existing hydraulic systems for slewing implements use fixed-displacement gear pumps, which provide relatively small flow rates. Flow regulation is achieved through throttling by relying on the valve core opening area of ​​the proportional directional valve assembly, resulting in low regulation accuracy. Furthermore, the European, American, and Australian markets have stringent requirements for back pressure in the breaker return oil. To meet these requirements, the breaker return oil in medium-sized excavators is mostly returned directly to the hydraulic oil tank, which poses a risk of high breaker oil temperature.

[0005] Therefore, those skilled in the art urgently need to solve the technical problems of existing hydraulic systems for rotating machinery. Summary of the Invention

[0006] Objective: In order to overcome the shortcomings of the existing technology, the present invention provides a machine rotation system and control method that can assist in heat dissipation.

[0007] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, a machine rotation system that can assist in heat dissipation includes: a PTO device, wherein the input end of the PTO device is connected to the power take-off port of an engine or a main pump, and the output end of the PTO device drives a variable displacement piston pump to rotate.

[0009] The inlet of the variable displacement piston pump draws oil from the hydraulic oil tank, and the outlet of the variable displacement piston pump is connected to the P port of the directional valve assembly.

[0010] The reversing valve assembly, according to the control signal output by the controller, reverses the hydraulic oil to the slewing attachment and then returns to the hydraulic oil tank via the radiator, or reverses the hydraulic oil to the radiator and then returns to the hydraulic oil tank.

[0011] The controller receives signals from the instruments, control handles, and oil temperature sensor, performs mode determination, and outputs corresponding control signals to the variable displacement piston pump and directional valve assembly.

[0012] The instrument is used to output the mechanical operating condition type to the controller.

[0013] The control handle is used to output the working status of the rotary attachment to the controller.

[0014] The oil temperature sensor is used to output the temperature of the hydraulic oil in the hydraulic tank to the controller.

[0015] As a preferred embodiment, the directional valve assembly includes: a directional valve, a first solenoid valve, and a second solenoid valve. The directional valve assembly has ports P, T, A1, and B1 on its valve body. Port P of the directional valve assembly is connected to port P on the directional valve. Port P on the directional valve is also connected to port A2 on the directional valve. Port T on the directional valve and port A1 on the directional valve are connected to port T of the directional valve assembly. Port B1 on the directional valve is connected to port A1 of the directional valve assembly. Port B2 on the directional valve is connected to port B1 of the directional valve assembly. Port P of the directional valve assembly is connected to ports P of the first solenoid valve and the second solenoid valve via a first regulating valve. Port T of both the first and second solenoid valves is connected to port T of the directional valve assembly. Port A of the first solenoid valve is connected to the control chamber C1 of the directional valve. Port A of the second solenoid valve is connected to the control chamber C2 of the directional valve. The control chambers C1 of the first and second solenoid valves are connected to a controller.

[0016] As a preferred embodiment, it also includes a first relief valve, wherein the oil port P of the reversing valve group is connected to the oil port T of the reversing valve group through the first relief valve.

[0017] As a preferred embodiment, it further includes: a second regulating valve, wherein a second regulating valve is provided between the oil port P of the reversing valve group and the oil port P on the reversing valve, and the second regulating valve is also connected to the oil port T of the reversing valve group.

[0018] As a preferred embodiment, it also includes: a check valve, wherein a check valve is provided between the oil port P on the reversing valve and the oil port A2 on the reversing valve.

[0019] As a preferred embodiment, it also includes a second relief valve and a third relief valve. The oil port B1 on the reversing valve is also connected to the oil port T of the reversing valve group through the second relief valve, and the oil port B2 on the reversing valve is also connected to the oil port T of the reversing valve group through the third relief valve.

[0020] Secondly, a control method for a machine rotation system that can assist in heat dissipation specifically includes:

[0021] When the instrument setting mode includes the tool slewing function, and the control handle has a slewing action, the controller determines that it is in the tool slewing working mode based on the electrical signals from the instrument and the control handle. The controller outputs an electrical signal to the variable displacement piston pump and the directional valve assembly. The directional valve assembly executes the directional valve reversing action, and the hydraulic oil output by the variable displacement piston pump as needed enters the slewing attachment through the directional valve to perform the slewing action. The returning hydraulic oil enters the radiator for cooling and finally returns to the hydraulic oil tank.

[0022] or,

[0023] When the instrument setting mode includes the tool slewing function, and the control handle does not rotate, the controller determines that it is in tool slewing standby mode based on the electrical signals from the instrument and the control handle. The controller outputs an electrical signal to the variable displacement piston pump and the directional valve assembly. The variable displacement piston pump maintains its minimum displacement state, the directional valve is in the neutral position, and the hydraulic oil output by the variable displacement piston pump at its minimum displacement state passes through the directional valve, enters the radiator for cooling, and finally returns to the hydraulic oil tank.

[0024] or,

[0025] When the instrument setting mode does not include the machine rotation function, and the hydraulic oil temperature in the hydraulic oil tank collected by the oil temperature sensor is greater than or equal to the judgment value T, the controller determines the auxiliary cooling working mode based on the electrical signals from the instrument and the oil temperature sensor. The controller outputs an electrical signal to the variable displacement piston pump and the directional valve assembly. This keeps the variable displacement piston pump at its maximum displacement state, and the directional valve is in the neutral position. The hydraulic oil output by the variable displacement piston pump at its maximum displacement state passes through the directional valve and directly enters the radiator for cooling, and finally returns to the hydraulic oil tank.

[0026] or,

[0027] When the instrument setting mode does not include the machine rotation function, and the hydraulic oil temperature in the hydraulic oil tank collected by the oil temperature sensor is lower than the judgment value T, the controller determines the auxiliary cooling standby mode based on the electrical signals from the instrument and the oil temperature sensor. The controller outputs an electrical signal to the variable displacement piston pump and the directional valve assembly. This keeps the variable displacement piston pump in its minimum displacement state, and the directional valve in the neutral position. The hydraulic oil output by the variable displacement piston pump at its minimum displacement state passes through the directional valve and directly enters the radiator for cooling, eventually returning to the hydraulic oil tank.

[0028] As a preferred option, the displacement of the variable displacement piston pump varies with the signal output by the control handle, achieving on-demand supply. The specific reversing direction of the directional valve assembly is determined by the sliding direction of the control handle.

[0029] As a preferred embodiment, the absence of the tool slewing function indicates working conditions other than the operation of the slewing attachment.

[0030] As a preferred embodiment, the control method for the directional valve assembly to perform the directional valve switching action specifically includes:

[0031] When the control handle is slid in one direction, the control handle outputs an electrical signal to the controller, and the controller inputs an electrical signal to the control oil chamber C1 of the first solenoid valve, so that the oil port P of the first solenoid valve is connected to the oil port A of the first solenoid valve.

[0032] Hydraulic oil enters from port P of the directional valve assembly, passes through the first regulating valve and the first solenoid valve, and enters the control oil chamber C1 of the directional valve. The directional valve operates in the first working position, with port A1 of the directional valve connected to port B2 of the directional valve, and port A2 of the directional valve connected to port B1 of the directional valve. Port P of the directional valve is cut off from port T of the directional valve.

[0033] Hydraulic oil enters from port P of the directional valve assembly, flows into the directional valve through port A2, and flows out from port B1. The hydraulic oil flows from port B1 of the directional valve into port A1 of the directional valve assembly and into the rotary attachment. The return oil from the rotary attachment flows through port B1 of the directional valve assembly into port B2 of the directional valve, and flows out from port A1 of the directional valve to port T of the directional valve assembly.

[0034] When the control handle is slid in another direction, the control handle outputs an electrical signal to the controller, and the controller inputs an electrical signal to the control oil chamber C1 of the second solenoid valve, and the oil port P of the second solenoid valve is connected to the oil port A of the second solenoid valve.

[0035] Hydraulic oil enters from port P of the directional valve assembly, passes through the first regulating valve and the second solenoid valve, and enters the control oil chamber C2 of the directional valve. The directional valve operates in the second working position, with port A1 and port B1 of the directional valve connected, port A2 and port B2 of the directional valve connected, and port P of the directional valve cut off from port T.

[0036] Hydraulic oil enters from port P of the directional valve assembly, flows into the directional valve through port A2, and flows out from port B2. The hydraulic oil flows from port B2 of the directional valve into port B1 of the directional valve assembly and into the rotary attachment. The return oil from the rotary attachment flows through port A1 of the directional valve assembly into port B1 of the directional valve, and flows out from port A1 of the directional valve to port T of the directional valve assembly.

[0037] Furthermore, the control method for the directional valve to be in the neutral position specifically includes:

[0038] When there is no operating signal from the control handle, the controller has no output signal to the first and second solenoid valves. Under the action of the spring, the oil ports T and A of the first and second solenoid valves are connected.

[0039] The hydraulic oil in the control oil chambers C1 and C2 of the directional control valve flows out through the oil port A of the first solenoid valve and the second solenoid valve, respectively. Under the action of the spring, the directional control valve is in the neutral position. The oil port P of the directional control valve is connected to the oil port T of the directional control valve, and the oil ports A1, B1, A2 and B2 of the directional control valve are cut off.

[0040] Hydraulic oil enters from port P of the directional valve assembly, flows into the directional valve through port P, flows out through port T of the directional valve, and then flows out from port T of the directional valve assembly.

[0041] Beneficial Effects: This invention provides a tool slewing system and control method with auxiliary heat dissipation, comprising a PTO device, a variable displacement piston pump, a directional valve assembly, a slewing attachment, a radiator, an oil temperature sensor, a controller, instruments, a control handle, and related control programs. Based on the operator's actual actions, it can autonomously switch between multiple functional modes: tool slewing working mode, tool slewing standby mode, auxiliary heat dissipation working mode, and auxiliary heat dissipation standby mode. The tool directional valve assembly only provides directional function, and the piston pump is a variable displacement pump with proportionally adjustable displacement. In the tool slewing working mode, the flow demand is supplied on demand by the variable displacement piston pump according to the instrument settings. In the auxiliary heat dissipation working mode, this tool slewing system allows hydraulic oil to enter the variable displacement piston pump from the hydraulic oil tank, pass through the neutral position of the tool directional valve, directly enter the radiator, and finally return to the hydraulic oil tank. This relatively independent hydraulic oil circulation achieves a heat dissipation effect. Especially during crushing operations, when the hydraulic oil temperature exceeds the set value, increasing the displacement of the variable displacement piston pump allows for a larger flow of hydraulic oil circulation, effectively reducing the risk of high temperatures during crushing. In both the implement slewing standby mode and the auxiliary cooling standby mode, the implement slewing system functions identically, circulating hydraulic oil at the minimum displacement of the variable displacement piston pump.

[0042] This invention enables on-demand flow supply, improving machine adaptability, and also provides auxiliary heat dissipation, effectively reducing the risk of high hydraulic oil temperature. It meets the machine's rotation requirements while accelerating hydraulic oil circulation, achieving an auxiliary heat dissipation effect. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the machine rotation system of the present invention.

[0044] Figure 2This is a schematic diagram of the reversing valve assembly of the present invention.

[0045] Figure 3 This is a schematic diagram of the control logic of the machine rotation system of the present invention. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0047] The present invention will be further described below with reference to specific embodiments.

[0048] Example 1:

[0049] This embodiment describes a machine rotation system that can assist in heat dissipation, such as... Figure 1 As shown, it includes: PTO device 1, variable piston pump 2, directional valve group 3, rotary attachment 4, radiator 5, hydraulic oil tank 6, oil temperature sensor 7, controller 8, operating handle 9, and instrument 10.

[0050] The PTO device 1 is installed at the power take-off port of the engine or the main pump, and the output end of the PTO device 1 drives the variable piston pump 2 to rotate.

[0051] The variable displacement piston pump 2 draws oil from the hydraulic oil tank 6 at its inlet and supplies oil to the P port of the directional valve assembly 3 at its outlet.

[0052] The reversing valve group 3, according to the control signal output by the controller 8, reverses the hydraulic oil to the slewing attachment 4 and then returns to the hydraulic oil tank 6 via the radiator 5, or reverses the hydraulic oil to the radiator 5 and then returns to the hydraulic oil tank 6.

[0053] The controller 8 receives signals from the instrument 10, the control handle 9 and the oil temperature sensor 7, performs mode judgment, and outputs corresponding control signals to the variable piston pump 2 and the reversing valve group 3.

[0054] like Figure 2As shown, the reversing valve assembly 3 includes: a reversing valve 301, a first solenoid valve 302, and a second solenoid valve 303. The valve body of the reversing valve assembly 3 is provided with port P, port T, port A1, and port B1. Port P of the reversing valve assembly 3 is connected to port P on the reversing valve 301. Port P on the reversing valve 301 is also connected to port A2 on the reversing valve 301. Ports T and A1 on the reversing valve 301 are respectively connected to port T of the reversing valve assembly 3. Port B1 on the reversing valve 301 is connected to port A1 of the reversing valve assembly 3. Port B2 on the reversing valve 301 is connected to port B1 of the reversing valve assembly 3. The oil port P of the reversing valve assembly 3 is connected to the oil port P of the first solenoid valve 302 and the second solenoid valve 303 via the first regulating valve 304. The oil ports T of the first solenoid valve 302 and the second solenoid valve 303 are both connected to the oil port T of the reversing valve assembly 3. The oil port A of the first solenoid valve 302 is connected to the control oil chamber C1 of the reversing valve 301. The oil port A of the second solenoid valve 303 is connected to the control oil chamber C2 of the reversing valve 301. The control oil chambers C1 of the first solenoid valve 302 and the second solenoid valve 303 are respectively connected to the controller 8.

[0055] Furthermore, it also includes a first relief valve 305, through which the oil port P of the directional valve assembly 3 is connected to the oil port T of the directional valve assembly 3. This is used to allow hydraulic oil exceeding the pressure requirement of the oil port P of the directional valve assembly 3 to flow out from the oil port T of the directional valve assembly 3.

[0056] Furthermore, it also includes a second regulating valve 306, which is provided between the oil port P of the reversing valve assembly 3 and the oil port P on the reversing valve 301. The second regulating valve 306 is also connected to the oil port T of the reversing valve assembly 3. It is used to regulate the hydraulic oil pressure entering the oil port P of the reversing valve 301.

[0057] Furthermore, it also includes a one-way valve 307, which is provided between port P on the directional valve 301 and port A2 on the directional valve 301. When ports B2 and A2 of the directional valve 301 are open, the one-way valve 307 prevents hydraulic oil from flowing from port B2 to port A2 of the directional valve 301.

[0058] Furthermore, it also includes a second relief valve 308 and a third relief valve 309. Port B1 on the directional control valve 301 is connected to port T of the directional control valve assembly 3 via the second relief valve 308, and port B2 on the directional control valve 301 is connected to port T of the directional control valve assembly 3 via the third relief valve 309. This is used to allow hydraulic oil exceeding the pressure requirements of ports A1 and B1 of the directional control valve assembly 3 to flow out from port T of the directional control valve assembly 3.

[0059] Example 2:

[0060] This embodiment describes a control method for a machine rotation system that can assist in heat dissipation, such as... Figure 3 As shown, it specifically includes:

[0061] When the instrument 10 is set to a mode that includes the slewing function, and the control handle 9 rotates, the controller 8 determines the slewing mode based on the electrical signals from the instrument 10 and the control handle 9. The controller 8 then outputs an electrical signal to the variable displacement piston pump 2 and the directional valve assembly 3. At this time, the directional valve assembly 3 executes the reversing action of the directional valve 301. The hydraulic oil output by the variable displacement piston pump 2 as needed enters the slewing attachment 4 through the directional valve 301 to perform the slewing action. The returned hydraulic oil enters the radiator 5 for cooling and finally returns to the hydraulic oil tank 6.

[0062] or,

[0063] When the instrument 10 is set to a mode that includes the machine rotation function, and the control handle 9 does not rotate, the controller 8 determines the machine rotation standby mode based on the electrical signals from the instrument 10 and the control handle 9. The controller 8 then outputs an electrical signal to the variable displacement piston pump 2 and the directional valve assembly 3. At this time, the variable displacement piston pump 2 maintains its minimum displacement state, the directional valve 301 is in the neutral position, and the hydraulic oil output by the variable displacement piston pump 2 at its minimum displacement state passes through the directional valve 301, enters the radiator 205 for cooling, and finally returns to the hydraulic oil tank 6.

[0064] or,

[0065] When the instrument 10 is set to a mode that does not include the machine rotation function, and the hydraulic oil temperature in the hydraulic oil tank 6 collected by the oil temperature sensor 7 is greater than or equal to the judgment value T, the controller 8 determines the auxiliary cooling working mode based on the electrical signals from the instrument 10 and the oil temperature sensor 7. The controller 8 outputs an electrical signal to the variable displacement piston pump 2 and the directional valve assembly 3. At this time, the variable displacement piston pump 2 is kept at its maximum displacement state, and the directional valve 301 is in the neutral position when there is no signal. The hydraulic oil output by the variable displacement piston pump 2 at its maximum displacement state enters the radiator 5 directly for cooling through the directional valve and finally returns to the hydraulic oil tank 6.

[0066] or,

[0067] When the instrument 10 is set to a mode that does not include the machine rotation function, and the hydraulic oil temperature in the hydraulic oil tank 6 collected by the oil temperature sensor 7 is lower than the judgment value T, the controller 8 determines the auxiliary cooling standby mode based on the electrical signals from the instrument 10 and the oil temperature sensor 7. The controller 8 outputs an electrical signal to the variable displacement piston pump 2 and the directional valve group 3. At this time, the variable displacement piston pump 2 is kept at its minimum displacement state, and the directional valve 301 is in the neutral position when there is no signal. The hydraulic oil output by the variable displacement piston pump 2 at its minimum displacement state passes through the directional valve 301 and directly enters the radiator 5 for cooling, and finally returns to the hydraulic oil tank 6.

[0068] Furthermore, the displacement of the variable displacement piston pump 2 changes according to the signal output by the control handle 9, achieving on-demand supply. The specific reversing direction of the directional valve assembly 3 is determined by the sliding direction of the control handle 9. For example, when the control handle 9 slides upward, the rotary attachment 4 rotates clockwise; when the control handle 9 slides downward, the rotary attachment 4 rotates counterclockwise. The greater the upward sliding range of the control handle 9, the greater the displacement of the variable displacement piston pump 2 and the greater the rotational speed of the rotary attachment 4; conversely, the greater the downward sliding range of the control handle 9, the greater the displacement of the variable displacement piston pump 2 and the greater the rotational speed of the rotary attachment 4.

[0069] Furthermore, the phrase "excluding the slewing function" refers to other working conditions besides the operation of slewing attachments, such as: digging mode, crushing mode, etc.

[0070] Furthermore, the control method for the reversing valve assembly 3 to execute the reversing action of the reversing valve 301 specifically includes:

[0071] When the operating handle 9 is slid in one direction, the operating handle outputs an electrical signal to the controller, and the controller inputs an electrical signal to the control oil chamber C1 of the first solenoid valve 302. The oil port P of the first solenoid valve 302 is connected to the oil port A of the first solenoid valve 302.

[0072] Hydraulic oil enters from port P of directional valve assembly 3, passes through first regulating valve 304 and first solenoid valve 302, and enters control oil chamber C1 of directional valve 301. directional valve 301 operates in the first working position. Port A1 of directional valve 301 is connected to port B2 of directional valve 301, and port A2 of directional valve 301 is connected to port B1 of directional valve 301. Port P of directional valve 301 is cut off from port T of directional valve 301.

[0073] Hydraulic oil enters from port P of directional valve assembly 3, flows into directional valve 301 through port A2, and flows out from port B1 of directional valve 301. Hydraulic oil flows from port B1 of directional valve 301 into port A1 of directional valve assembly 3 and into rotary attachment 4. The return oil from rotary attachment 4 flows through port B1 of directional valve assembly 3 into port B2 of directional valve 301, and flows out from port A1 of directional valve 301 to port T of directional valve assembly 3.

[0074] When the operating handle 9 is slid in another direction, the operating handle outputs an electrical signal to the controller, and the controller inputs an electrical signal to the control oil chamber C1 of the second solenoid valve 303. The oil port P of the second solenoid valve 303 is connected to the oil port A of the second solenoid valve 303.

[0075] Hydraulic oil enters from port P of directional valve assembly 3, passes through first regulating valve 304 and second solenoid valve 303, and enters control oil chamber C2 of directional valve 301. directional valve 301 operates in the second working position. Port A1 of directional valve 301 is connected to port B1 of directional valve 301, and port A2 of directional valve 301 is connected to port B2 of directional valve 301. Port P of directional valve 301 is cut off from port T of directional valve 301.

[0076] Hydraulic oil enters from port P of directional valve assembly 3, flows into directional valve 301 through port A2, and flows out from port B2 of directional valve 301. The hydraulic oil flows from port B2 of directional valve 301 into port B1 of directional valve assembly 3 and into rotary attachment 4. The return oil from rotary attachment 4 flows through port A1 of directional valve assembly 3 into port B1 of directional valve 301, and flows out from port A1 of directional valve 301 to port T of directional valve assembly 3.

[0077] Furthermore, the control method for the reversing valve 301 to be in the neutral position specifically includes:

[0078] When there is no operation signal from the control handle 9, the controller has no output signal to the first solenoid valve 302 and the second solenoid valve 303. Under the action of the spring, the oil port T of the first solenoid valve 302 and the oil port A of the second solenoid valve 303 are connected.

[0079] Hydraulic oil in the control oil chambers C1 and C2 of the directional control valve 301 flows out through the oil port A of the first solenoid valve 302 and the second solenoid valve 303, respectively. Under the action of the spring, the directional control valve 301 operates in the neutral position. The oil port P of the directional control valve 301 is connected to the oil port T of the directional control valve 301, and the oil ports A1, B1, A2, and B2 of the directional control valve 301 are closed.

[0080] Hydraulic oil enters from port P of directional valve assembly 3, flows in through port P of directional valve 301, flows out through port T of directional valve 301, and flows out from port T of directional valve assembly 3.

[0081] Example 3:

[0082] This invention proposes a machine rotation system and control method, which can autonomously switch between four functional modes according to the operator's actual actions: machine rotation working mode, machine rotation standby mode, auxiliary heat dissipation working mode, and auxiliary heat dissipation standby mode.

[0083] The implement directional valve assembly only provides directional control, and the piston pump is a variable displacement piston pump with proportionally adjustable displacement. In implement slewing mode, the flow rate requirement is supplied on demand by the variable displacement piston pump based on the instrument settings. In auxiliary cooling mode, the implement slewing system allows hydraulic oil to flow from the hydraulic oil tank into the variable displacement piston pump, through the neutral position of the implement directional valve, directly into the radiator, and finally back to the hydraulic oil tank. This relatively independent hydraulic oil circulation achieves a cooling effect. Especially during crushing operations, when the hydraulic oil temperature exceeds the set value, increasing the displacement of the variable displacement piston pump achieves a larger flow rate of hydraulic oil circulation, effectively reducing the risk of high-temperature crushing. In implement slewing standby mode and auxiliary cooling standby mode, the implement slewing system functions identically, circulating hydraulic oil at the minimum displacement of the variable displacement piston pump.

[0084] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A machine rotation system that can assist in heat dissipation, characterized in that: include: The PTO device has its input end connected to the power take-off port of the engine or main pump, and its output end drives the variable displacement piston pump to rotate. The inlet of the variable displacement piston pump draws oil from the hydraulic oil tank, and the outlet of the variable displacement piston pump is connected to the P port of the directional valve assembly. The reversing valve group, according to the control signal output by the controller, reverses the hydraulic oil to the rotary attachment and then returns to the hydraulic oil tank via the radiator, or reverses the hydraulic oil to the radiator and then returns to the hydraulic oil tank. The controller receives signals from the instruments, control handles, and oil temperature sensor, performs mode judgment, and outputs corresponding control signals to the variable displacement piston pump and directional valve assembly. The instrument is used to output the mechanical operating condition type to the controller; The control handle is used to output the working status of the rotary attachment to the controller; The oil temperature sensor is used to output the temperature of the hydraulic oil in the hydraulic oil tank to the controller; The directional valve assembly includes: a directional valve, a first solenoid valve, and a second solenoid valve; the valve body of the directional valve assembly is provided with oil port P, oil port T, oil port A1, and oil port B1. Oil port P of the directional valve assembly is connected to oil port P on the directional valve. Oil port P on the directional valve is also connected to oil port A2 on the directional valve. Oil port T on the directional valve and oil port A1 on the directional valve are respectively connected to oil port T of the directional valve assembly. Oil port B1 on the directional valve is connected to oil port A1 of the directional valve assembly. Port B2 is connected to port B1 of the directional valve assembly; port P of the directional valve assembly is connected to port P of the first solenoid valve and the second solenoid valve via the first regulating valve; port T of the first solenoid valve and the second solenoid valve are both connected to port T of the directional valve assembly; port A of the first solenoid valve is connected to the control oil chamber C1 of the directional valve; port A of the second solenoid valve is connected to the control oil chamber C2 of the directional valve; and the control oil chambers C1 of the first solenoid valve and the second solenoid valve are respectively connected to the controller.

2. The machine rotation system with auxiliary heat dissipation according to claim 1, characterized in that: It also includes a first relief valve, wherein the oil port P of the reversing valve group is connected to the oil port T of the reversing valve group through the first relief valve.

3. The machine rotation system with auxiliary heat dissipation according to claim 1, characterized in that: Also includes: The second regulating valve is provided between the oil port P of the reversing valve group and the oil port P on the reversing valve, and the second regulating valve is also connected to the oil port T of the reversing valve group.

4. The machine rotation system with auxiliary heat dissipation according to claim 1, characterized in that: Also includes: A one-way valve is provided between the oil port P on the reversing valve and the oil port A2 on the reversing valve.

5. The machine rotation system with auxiliary heat dissipation according to claim 1, characterized in that: It also includes a second relief valve and a third relief valve. The oil port B1 on the reversing valve is also connected to the oil port T of the reversing valve group through the second relief valve, and the oil port B2 on the reversing valve is also connected to the oil port T of the reversing valve group through the third relief valve.

6. A control method for a machine rotation system with auxiliary heat dissipation according to any one of claims 1 to 5, characterized in that: Specifically, it includes: When the instrument setting mode includes the tool slewing function and the control handle has a slewing action, the controller determines the tool slewing working mode based on the electrical signals from the instrument and the control handle. The controller outputs an electrical signal to the variable piston pump and the directional valve assembly. The directional valve assembly executes the directional valve switching action. The hydraulic oil output by the variable piston pump as needed enters the slewing attachment through the directional valve to execute the slewing action. The returned hydraulic oil enters the radiator for cooling and finally returns to the hydraulic oil tank. or, When the instrument setting mode includes the machine rotation function and the control handle does not rotate, the controller determines the machine rotation standby mode based on the electrical signals from the instrument and the control handle. The controller outputs an electrical signal to the variable displacement piston pump and the directional valve group. The variable displacement piston pump maintains the minimum displacement state, the directional valve is in the neutral state, and the hydraulic oil output by the variable displacement piston pump at the minimum displacement state passes through the directional valve, enters the radiator for heat dissipation, and finally returns to the hydraulic oil tank. or, When the instrument setting mode does not include the machine rotation function, and the hydraulic oil temperature in the hydraulic oil tank collected by the oil temperature sensor is greater than or equal to the judgment value T, the controller determines the auxiliary heat dissipation working mode based on the electrical signals of the instrument and the oil temperature sensor. The controller outputs an electrical signal to the variable piston pump and the reversing valve group; the variable piston pump is kept in the maximum displacement state, the reversing valve is in the neutral state, and the hydraulic oil output by the variable piston pump at the maximum displacement state enters the radiator directly for heat dissipation through the reversing valve and finally returns to the hydraulic oil tank. or, When the instrument setting mode does not include the machine rotation function, and the hydraulic oil temperature in the hydraulic oil tank collected by the oil temperature sensor is less than the judgment value T, the controller determines the auxiliary heat dissipation standby mode based on the electrical signals of the instrument and the oil temperature sensor. The controller outputs an electrical signal to the variable displacement piston pump and the directional valve group; the variable displacement piston pump is kept in the minimum displacement state, the directional valve is in the neutral state, and the hydraulic oil output by the variable displacement piston pump in the minimum displacement state enters the radiator directly for heat dissipation through the directional valve and finally returns to the hydraulic oil tank.

7. The control method according to claim 6, characterized in that: The displacement of the variable displacement piston pump changes with the signal output by the control handle, thus achieving on-demand supply; the specific reversing direction of the directional valve assembly is determined by the sliding direction of the control handle.

8. The control method according to claim 6, characterized in that: The control method for the reversing valve assembly to perform the reversing action of the reversing valve specifically includes: When the operating handle is slid in one direction, the operating handle outputs an electrical signal to the controller, and the controller inputs an electrical signal to the control oil chamber C1 of the first solenoid valve, and the oil port P of the first solenoid valve is connected to the oil port A of the first solenoid valve. Hydraulic oil enters from port P of the directional valve assembly, passes through the first regulating valve and the first solenoid valve, and enters the control oil chamber C1 of the directional valve. The directional valve operates in the first working position. Port A1 of the directional valve is connected to port B2 of the directional valve, and port A2 of the directional valve is connected to port B1 of the directional valve. Port P of the directional valve is cut off from port T of the directional valve. Hydraulic oil enters from port P of the directional valve assembly, flows in through port A2 of the directional valve, and flows out through port B1 of the directional valve. The hydraulic oil flows from port B1 of the directional valve into port A1 of the directional valve assembly and into the rotary attachment. The return oil from the rotary attachment flows through port B1 of the directional valve assembly into port B2 of the directional valve, and flows out through port A1 of the directional valve to port T of the directional valve assembly. When the operating handle is slid in another direction, the operating handle outputs an electrical signal to the controller, and the controller inputs an electrical signal to the control oil chamber C1 of the second solenoid valve, and the oil port P of the second solenoid valve is connected to the oil port A of the second solenoid valve. Hydraulic oil enters from port P of the directional valve assembly, passes through the first regulating valve and the second solenoid valve, and enters the control oil chamber C2 of the directional valve. The directional valve operates in the second working position. Port A1 of the directional valve is connected to port B1 of the directional valve, and port A2 of the directional valve is connected to port B2 of the directional valve. Port P of the directional valve is cut off from port T of the directional valve. Hydraulic oil enters from port P of the directional valve assembly, flows into the directional valve through port A2, and flows out from port B2. The hydraulic oil flows from port B2 of the directional valve into port B1 of the directional valve assembly and into the rotary attachment. The return oil from the rotary attachment flows through port A1 of the directional valve assembly into port B1 of the directional valve, and flows out from port A1 of the directional valve to port T of the directional valve assembly.

9. The control method according to claim 6, characterized in that: The control method for the directional valve to be in the neutral position specifically includes: When there is no operation signal from the control handle, the controller has no output signal to the first solenoid valve and the second solenoid valve. Under the action of the spring, the oil port T of the first solenoid valve and the oil port A of the second solenoid valve are connected. The hydraulic oil in the control oil chambers C1 and C2 of the directional valve flows out through the oil port A of the first solenoid valve and the second solenoid valve, respectively. Under the action of the spring, the directional valve works in the neutral position. The oil port P of the directional valve is connected to the oil port T of the directional valve, and the oil ports A1, B1, A2 and B2 of the directional valve are cut off. Hydraulic oil enters from port P of the directional valve assembly, flows into the directional valve through port P, flows out through port T of the directional valve, and then flows out from port T of the directional valve assembly.

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