Hydraulic control system for slewing, engineering machine and braking control method
By introducing a main brake, auxiliary brake, hydraulic pump, rotary motor, and control circuit into the engineering machinery, and using an encoder and solenoid valve control system, the problems of swaying and positioning accuracy during the rotation of the engineering machinery were solved, thereby improving safety and accuracy.
Patent Information
- Application Number
- CN202210565676.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-05-23
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2042-05-23
AI Technical Summary
The slewing motion of construction machinery under normally closed static brakes results in large swaying, leading to low safety and insufficient positioning accuracy during the slewing process, requiring manual assistance.
It employs a main brake, a secondary brake, a hydraulic pump, a rotary motor, an encoder, and a control circuit. The encoder detects angle signals, and the rotary motor's opening and closing and braking force are controlled by a solenoid valve and a pressure reducing valve. This achieves the coordinated action of the main and secondary brakes, gradually outputting braking force to mitigate impact and improve rotary accuracy.
It reduces swaying during rotation, improves rotation safety and positioning accuracy, and reduces the need for manual operation.
Smart Images
Figure CN115159373B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of engineering machinery, in particular to a slewing hydraulic control system, an engineering machinery and a braking control method. BACKGROUND
[0002] In the field of engineering machinery, the slewing action of the engineering machinery generally adopts a normally closed static brake. When the device starts to work, the hydraulic circuit opens the brake through a pilot pressure to drive the slewing work. This braking method will bring a large amount of shaking, thereby reducing the safety in the slewing process, and due to the high amount of shaking, the positioning accuracy of the slewing is not enough, which needs manual assistance. SUMMARY
[0003] The main purpose of the present application is to provide a slewing hydraulic control system, an engineering machinery and a braking control method, which aims to solve the above technical problems.
[0004] To achieve the above purpose, the present application provides a slewing hydraulic control system, which comprises a main brake, a secondary brake, a hydraulic pump, a slewing motor, an encoder and a control circuit. The hydraulic pump provides hydraulic power for the control circuit. The encoder is connected with the secondary brake to detect an angle signal. The control circuit comprises a motor control unit, a main control unit and a secondary control unit. The secondary control unit is connected with the secondary brake to control the opening and closing of the secondary brake and the size of the braking force. The main control unit is used to control the opening and closing of the main brake. The motor control unit is used to control the slewing direction and the slewing speed of the slewing motor, and is used to control the through state of the two cavities of the slewing motor.
[0005] In an embodiment, the motor control unit comprises a reversing valve and a first electromagnetic valve connected with each other. The first electromagnetic valve is connected with the slewing motor.
[0006] In an embodiment, the main control unit comprises a second electromagnetic valve and a first pressure reducing valve connected with each other. The first pressure reducing valve is connected with the main brake.
[0007] In an embodiment, the secondary control unit comprises a third electromagnetic valve and a second pressure reducing valve connected with each other. The second pressure reducing valve is connected with the secondary brake.
[0008] In an embodiment, the second pressure reducing valve is a proportional pressure reducing valve.
[0009] In an embodiment, the slewing hydraulic control system further comprises an overflow valve, which is connected in communication with the hydraulic pump.
[0010] In addition, the present application also provides an engineering machinery, which comprises the slewing hydraulic control system as described above.
[0011] In addition, the application further provides a braking control method of the engineering machine, which is applied to the engineering machine as described above, and comprises the following steps:
[0012] obtaining an angle signal of the encoder;
[0013] if the angle signal of the encoder is less than a set value V0, controlling the reversing valve to lose power and controlling the first electromagnetic valve to be powered on so as to make the slewing motor in a free rotation state;
[0014] controlling the third electromagnetic valve to be powered on, and controlling the second pressure reducing valve to output different braking forces so as to make the engineering machine stop gradually;
[0015] releasing the slewing motor at the same time, and making the main brake freely release the clearance between the gears.
[0016] In an embodiment, the braking control method of the engineering machine further comprises the following steps:
[0017] when the angle signal of the encoder is equal to 0, controlling the second electromagnetic valve to be powered on so as to make the main brake perform static braking.
[0018] In the technical scheme of the application, the slewing hydraulic control system comprises a main brake, a secondary brake, a hydraulic pump, a slewing motor, an encoder and a control circuit, the hydraulic pump provides hydraulic power for the control circuit, the encoder is connected with the secondary brake to detect an angle signal, the control circuit comprises a motor control unit, a main control unit and a secondary control unit, the secondary control unit is connected with the secondary brake to control the opening and closing of the secondary brake and the size of the braking force, the main control unit is used to control the opening and closing of the main brake, and the motor control unit is used to control the slewing direction and slewing speed of the slewing motor and the series connection state of the two cavities of the slewing motor. In the technical scheme, the main brake is used for slewing action and static braking, the slewing motor and the main slewing mechanism are used for driving the slewing action, the secondary brake is used for dynamic braking of the slewing action, and by changing the size of the output braking force of the secondary brake, the braking force can be gradually output in a proportional form, slowly acting on the slewing mechanism, reducing the impact, and improving the slewing precision. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without any creative effort.
[0020] Figure 1A structure schematic diagram of a slewing hydraulic control system of an embodiment of the present application;
[0021] Figure 2 A flowchart of a brake control method of the present application.
[0022] Brief Description of Drawings: 10, main brake; 20, auxiliary brake; 30, hydraulic pump; 40, slewing motor; 50, encoder; 60, control circuit; 61, reversing valve; 62, first electromagnetic valve; 63, second electromagnetic valve; 64, first pressure reducing valve; 65, third electromagnetic valve; 66, second pressure reducing valve; 70, overflow valve.
[0023] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.
[0025] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.
[0026] In addition, the descriptions such as “first”, “second” and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first”, “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “plurality” is at least two, for example, two, three, etc., unless otherwise specifically limited.
[0027] Moreover, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.
[0028] The present application provides an engineering machine, which can be a crane, a hoist, etc., and the engineering machine comprises at least one slewing hydraulic control system.
[0029] In an embodiment, please refer toFigure 1 The rotary hydraulic control system comprises a main brake 10, a secondary brake 20, a hydraulic pump 30, a rotary motor 40, an encoder 50 and a control circuit 60, the hydraulic pump 30 provides hydraulic power for the control circuit 60, the encoder 50 and the secondary brake 20 are connected to detect an angle signal, the control circuit 60 comprises a motor control unit, a main control unit and a secondary control unit, the secondary control unit is connected with the secondary brake 20 to control the opening and closing of the secondary brake 20 and the size of the braking force, the main control unit is used for controlling the opening and closing of the main brake 10, the motor control unit is used for controlling the rotary direction and rotary speed of the rotary motor 40 and is used for controlling the series state of the two cavities of the rotary motor 40.
[0030] In the embodiment, the rotary hydraulic control system comprises a main brake 10, a secondary brake 20, a hydraulic pump 30, a rotary motor 40, an encoder 50 and a control circuit 60, the hydraulic pump 30 provides hydraulic power for the control circuit 60, the encoder 50 and the secondary brake 20 are connected to detect an angle signal, the control circuit 60 comprises a motor control unit, a main control unit and a secondary control unit, the secondary control unit is connected with the secondary brake 20 to control the opening and closing of the secondary brake 20 and the size of the braking force, the main control unit is used for controlling the opening and closing of the main brake 10, the motor control unit is used for controlling the rotary direction and rotary speed of the rotary motor 40 and is used for controlling the series state of the two cavities of the rotary motor 40. In the technical scheme, the main brake 10 is used for static braking of the rotary action, the rotary motor and the main rotary mechanism are used for driving of the rotary action, the secondary brake is used for dynamic braking of the rotary action, and by changing the output braking force size of the secondary brake 20, the braking force can be gradually output in a proportional form, the rotary mechanism is slowly acted on, the impact is reduced, and the rotary precision is improved.
[0031] The motor control unit comprises a reversing valve 61 and a first electromagnetic valve 62 connected with each other, and the first electromagnetic valve 62 is connected with the rotary motor 40. The reversing valve 61 is used for controlling the rotary direction and rotary speed of the rotary motor 40, and the first electromagnetic valve 62 is used for controlling the series state of the two cavities of the rotary motor 40, and can realize the free state of the rotary motor 40 after being powered on.
[0032] The main control unit comprises a second electromagnetic valve 63 and a first pressure reducing valve 64 connected to each other, and the first pressure reducing valve 64 is connected to the main brake 10. The auxiliary control unit comprises a third electromagnetic valve 65 and a second pressure reducing valve 66 connected to each other, and the second pressure reducing valve 66 is connected to the auxiliary brake 20. The second electromagnetic valve 63 and the first pressure reducing valve 64 are used to control the opening and closing of the main brake 10. The third electromagnetic valve 65 and the second pressure reducing valve 66 are used to control the opening and closing of the auxiliary brake 20 and the size of the braking force.
[0033] In a preferred embodiment, the second pressure reducing valve 66 is a proportional pressure reducing valve, which slowly outputs the braking force, reduces the braking impact, and, in combination with the free state control of the rotary motor 40, can avoid the main rotary mechanism from bearing additional load, reduce the impact, and improve the service life of the mechanism. In another embodiment, the first pressure reducing valve 64 can also be used as a proportional pressure reducing valve.
[0034] In addition, the rotary hydraulic control system further comprises an overflow valve 70 connected to the hydraulic pump 30. In this embodiment, the overflow valve 70 functions as a pressure regulating overflow.
[0035] Further, the application also provides a braking control method of the engineering machinery, please refer to Figure 2 , the braking control method of the engineering machinery comprises:
[0036] Step S10, obtaining the angle signal of the encoder 50;
[0037] Step S20, if the angle signal of the encoder 50 is less than a set value V0, controlling the reversing valve 61 to lose power and the first electromagnetic valve 62 to be powered on to make the rotary motor 40 in a free rotating state;
[0038] Step S30, controlling the third electromagnetic valve 65 to be powered on, controlling the second pressure reducing valve 66 to output different braking forces to make the engineering machinery stop gradually, and releasing the rotary motor 40 to make the main rotary mechanism free to release the gap between the gears.
[0039] Further, the braking control method of the engineering machinery further comprises:
[0040] Step S40, when the angle signal of the encoder 50 is equal to 0, controlling the second electromagnetic valve 63 to be powered on to make the main brake 10 perform static braking.
[0041] The auxiliary brake 20 adopts the joint control of the third electromagnetic valve 65 and the second pressure reducing valve 66, the third electromagnetic valve 65 controls the braking timing of the auxiliary brake 20, and the second pressure reducing valve 66 controls the size of the output braking force of the auxiliary brake 20. In a proportional form, the braking force can be output gradually, slowly acting on the rotary mechanism to reduce the impact, and at the same time, the parameters can be adjusted on site to realize different braking forces.
[0042] The above merely provides the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure variations made according to the present application description and the attached drawings, or direct / indirect application in other related technical fields shall be included in the patent protection scope of the present application.
Claims
1. A braking control method for engineering machinery, characterized in that, The engineering machinery includes a slewing hydraulic control system; the slewing hydraulic control system includes a main brake (10), a secondary brake (20), a hydraulic pump (30), a slewing motor (40), an encoder (50), and a control circuit (60). The hydraulic pump (30) provides hydraulic power to the control circuit (60). The encoder (50) is connected to the secondary brake (20) to detect angle signals. The control circuit (60) includes a motor control unit, a main control unit, and a secondary control unit. The secondary control unit is connected to the secondary brake (20) to control the opening and closing of the secondary brake (20) and the magnitude of the braking force. The main control unit is connected to the main brake (10) and is used to control the opening and closing of the main brake (10). The motor control unit is used to control the slewing direction and slewing speed of the slewing motor (40) and to control the interconnection state of the two chambers of the slewing motor (40). The motor control unit includes a reversing valve (61) and a first solenoid valve (62) connected to each other, the first solenoid valve (62) being connected to the rotary motor (40); the main control unit includes a second solenoid valve (63) and a first pressure reducing valve (64) connected to each other, the first pressure reducing valve (64) being connected to the main brake (10); the auxiliary control unit includes a third solenoid valve (65) and a second pressure reducing valve (66) connected to each other, the second pressure reducing valve (66) being connected to the auxiliary brake (20); The second pressure reducing valve (66) is a proportional pressure reducing valve; Braking control methods for construction machinery include: Obtain the angle signal from the encoder (50); If the angle signal of the encoder (50) is less than the set value V0, the control reversing valve (61) is de-energized and the first solenoid valve (62) is energized to make the rotary motor (40) free to rotate. The third solenoid valve (65) is energized, and the second pressure reducing valve (66) is energized to output different braking forces to gradually stop the construction machinery; At the same time, release the rotary motor (40) to allow the main rotary mechanism to freely release the gap between the gears; When the angle signal of the encoder (50) is equal to 0, the second solenoid valve (63) is energized to make the main brake (10) perform static braking.
2. The braking control method for engineering machinery according to claim 1, characterized in that, The rotary hydraulic control system also includes an overflow valve (70), which is connected to the hydraulic pump (30).