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CN-122014699-A - Engineering machinery motor oil supplementing system, control method thereof and engineering machinery

CN122014699ACN 122014699 ACN122014699 ACN 122014699ACN-122014699-A

Abstract

The invention discloses an engineering machinery motor oil supplementing system and a control method thereof, and engineering machinery, wherein the engineering machinery motor oil supplementing system comprises a rotary motor, a main valve, a variable back pressure valve, an oil supplementing control valve and an accumulator, wherein the rotary motor is provided with an oil inlet, an oil return port and an oil supplementing port, the main valve is respectively connected with the oil inlet and the oil return port, the main valve is connected with an oil return path, the variable back pressure valve is arranged on the oil return path and comprises a first station and a second station, the back pressure of the first station is larger than that of the second station, the oil supplementing control valve is connected with the oil supplementing port and is respectively connected with the oil return path at the position of the oil inlet side of the variable back pressure valve, the oil supplementing control valve is provided with a first state and a second state, the accumulator is connected with the oil supplementing control valve in series, when the oil supplementing control valve is in the first state, the oil return path is conducted unidirectionally, the accumulator is conducted to the oil return path, and when the oil supplementing control valve is in the second state. The invention can avoid the suction of the oil inlet side of the rotary motor, has strong oil supplementing capability, can be suitable for various working conditions and is beneficial to energy conservation.

Inventors

  • GUAN WEI
  • ZHANG HAO
  • LU HUIPING
  • ZHANG JINGE

Assignees

  • 山河智能装备股份有限公司

Dates

Publication Date
20260512
Application Date
20260320

Claims (10)

  1. 1. An oil supplementing system for a motor of an engineering machine, comprising: The rotary motor (1) is provided with an oil inlet, an oil return port and an oil supplementing port (M); The main valve (2) is respectively connected with the oil inlet and the oil return port, and the main valve (2) is connected with an oil return path (21); the variable back pressure valve (3) is arranged on the oil return path (21) and comprises a first station and a second station, and the back pressure of the first station is larger than that of the second station; the oil supplementing control valve (4) is connected with the oil supplementing port (M) and is respectively connected with the oil return channel (21) at the position of the oil inlet side of the variable backpressure valve (3), and the oil supplementing control valve (4) is in a first state and a second state; the energy accumulator (5) is connected in series with the oil supplementing control valve (4), when the oil supplementing control valve (4) is in the first state, the oil return path (21) is in one-way conduction with the energy accumulator (5), the energy accumulator (5) is not in conduction with the oil return path (21), and when the oil supplementing control valve (4) is in the second state, the energy accumulator (5) is in conduction with the oil return path (21).
  2. 2. The work machine motor oil refill system of claim 1, further comprising: -a controller (6) connected to the variable back pressure valve (3) and the oil replenishment control valve (4), respectively, the controller (6) being configured to: When the pressure of the accumulator (5) is lower than a first preset value, controlling the variable back pressure valve (3) to be positioned at the first station and controlling the oil supplementing control valve (4) to be positioned at the first state; when the pressure of the energy accumulator (5) is larger than or equal to the first preset value, controlling the variable back pressure valve (3) to be positioned at the second station and controlling the oil supplementing control valve (4) to be positioned at the first state; when the pressure of the oil supplementing port (M) is lower than a second preset value, the variable back pressure valve (3) is controlled to be located at the first station, and the oil supplementing control valve (4) is controlled to be located at the second state.
  3. 3. The oil supplementing system of a motor of an engineering machine according to claim 1, wherein the oil supplementing control valve (4) comprises a first flow passage and a second flow passage which are connected in parallel, the first flow passage is provided with a first one-way valve (41), and the flow direction of the first one-way valve (41) is from the oil return passage (21) to the energy accumulator (5); the second flow passage is provided with a switch valve (42), when the switch valve (42) is closed, the oil supplementing control valve (4) is in the first state, and when the switch valve (42) is opened, the oil supplementing control valve (4) is in the second state.
  4. 4. The engineering machinery motor oil supplementing system according to claim 2, wherein the switch valve (42) is connected with a first pilot valve (7), the first pilot valve (7) is connected with a controller (6), and the controller (6) is used for controlling the switch valve (42) to be opened or closed by controlling the first pilot valve (7).
  5. 5. The work machine motor oil replenishment system according to claim 1, wherein the oil replenishment control valve (4) comprises: the cartridge valve (43) comprises a control cavity, a control port, a first working oil port and a second working oil port, wherein the first working oil port is connected with the oil return path (21), and the second working oil port is connected with the energy accumulator (5); The pilot control valve (44) is connected between the control port and the control cavity, and is provided with a third station and a fourth station, when the pilot control valve (44) is positioned at the third station, the control cavity is communicated with the control port to enable the oil supplementing control valve (4) to be in the first state, and when the pilot control valve (44) is positioned at the fourth station, the control cavity is communicated with the oil tank to enable the oil supplementing control valve (4) to be in the second state.
  6. 6. The oil supplementing system of the engineering machinery motor according to claim 1, wherein the variable back pressure valve (3) is provided with a second one-way valve (31) or a throttle valve (32) corresponding to the flow passage of the first station, and the variable back pressure valve (3) is a passage with two ends fully communicated with the flow passage of the second station.
  7. 7. The work machine motor oil compensating system according to claim 6, characterized in that the variable back pressure valve (3) is connected to a second pilot valve (8), the second pilot valve (8) is connected to a controller (6), the controller (6) is configured to control the second pilot valve (8) to switch the variable back pressure valve (3) between the first station and the second station.
  8. 8. Engineering machinery motor oil compensating system according to any of claims 1-7, characterized in that the inlet of the accumulator (5) is provided with a first pressure sensor (51) and/or the inlet of the variable back pressure valve (3) is provided with a second pressure sensor (33).
  9. 9. A control method of an oil supplementing system of a motor of an engineering machine, which is applied to the oil supplementing system of the motor of the engineering machine according to any one of claims 1 to 8, and comprises the following steps: Judging whether the pressure of an accumulator of the engineering machinery motor oil supplementing system is smaller than a first preset value or not; if yes, controlling a variable back pressure valve of the engineering machinery motor oil supplementing system to be positioned at a first station, and controlling an oil supplementing control valve of the engineering machinery motor oil supplementing system to be in a first state; If not, controlling the variable back pressure valve to be positioned at a second station, and controlling the oil supplementing control valve to be in the first state; judging whether the pressure of an oil supplementing port M of a rotary motor of the engineering machinery motor oil supplementing system is smaller than a second preset value or not; if yes, the variable back pressure valve is controlled to be located at the first station, and the oil supplementing control valve is controlled to be located at the second state.
  10. 10. Engineering machinery, characterized by comprising the engineering machinery motor oil supplementing system according to any one of claims 1-8.

Description

Engineering machinery motor oil supplementing system, control method thereof and engineering machinery Technical Field The invention relates to the technical field of motor oil supplement, in particular to an engineering machinery motor oil supplement system, a control method thereof and engineering machinery. Background For construction machines such as excavators and cranes, a swing motor is used to drive a work implement to rotate. In the related art, when the working device rotates to brake, the main valve cuts off the oil supply of the main pump to the rotary motor and the oil return of the rotary motor, however, due to the large rotary inertia of the working device, the working device drives the rotary motor to rotate continuously under the action of the rotary inertia, so that the oil return side of the rotary motor forms high pressure, the part of high pressure oil can overflow through the overflow valve or be recovered through the energy storage system, and meanwhile, the oil inlet side of the rotary motor is easy to generate a suction phenomenon due to the pressure reduction. Therefore, how to avoid the suction phenomenon generated on the oil inlet side of the rotary motor during rotary braking is a problem to be solved by the present person in the art. Disclosure of Invention Therefore, the invention aims to provide an oil supplementing system for a motor of an engineering machine, so as to avoid the phenomenon of suction on the oil inlet side of the rotary motor during rotary braking. The invention also aims to provide a control method of the engineering machinery motor oil supplementing system, which is applied to the engineering machinery motor oil supplementing system, so as to avoid the phenomenon that the oil inlet side of the rotary motor is sucked when the rotary motor is braked in a rotary way. Another object of the present invention is to provide an engineering machine including the above-mentioned oil compensating system for an engineering machine motor, so as to avoid a suction phenomenon generated on an oil inlet side of the swing motor during a swing braking. In order to achieve the above object, the present invention provides the following technical solutions: an engineering machinery motor oil supplementing system, comprising: the rotary motor is provided with an oil inlet, an oil return port and an oil supplementing port; the main valve is respectively connected with the oil inlet and the oil return port and is connected with an oil return path; the variable back pressure valve is arranged on the oil return path and comprises a first station and a second station, and the back pressure of the first station is larger than that of the second station; The oil supplementing control valve is connected with the oil supplementing port and is respectively connected with the oil return channel at the position of the oil inlet side of the variable backpressure valve, and the oil supplementing control valve is in a first state and a second state; the oil supplementing control valve is connected in series with the oil supplementing control valve, when the oil supplementing control valve is in the first state, the oil return channel is conducted unidirectionally to the energy accumulator, the energy accumulator is not conducted to the oil return channel, and when the oil supplementing control valve is in the second state, the energy accumulator is conducted to the oil return channel. Optionally, the method further comprises: A controller connected to the variable back pressure valve and the make-up control valve, respectively, the controller configured to: when the pressure of the energy accumulator is lower than a first preset value, controlling the variable back pressure valve to be positioned at the first station and controlling the oil supplementing control valve to be positioned at the first state; When the pressure of the energy accumulator is larger than or equal to the first preset value, controlling the variable back pressure valve to be positioned at the second station and controlling the oil supplementing control valve to be positioned at the first state; when the pressure of the oil supplementing port is lower than a second preset value, the variable back pressure valve is controlled to be located at the first station, and the oil supplementing control valve is controlled to be located at the second state. Optionally, the oil supplementing control valve comprises a first flow passage and a second flow passage which are connected in parallel, the first flow passage is provided with a first one-way valve, and the flow direction of the first one-way valve is from the oil return passage to the energy accumulator; The second flow passage is provided with a switch valve, when the switch valve is closed, the oil supplementing control valve is in the first state, and when the switch valve is opened, the oil supplementing control valve is in the second state. Optionally, the switch valve is