Hydraulic motor based on electronic flow distribution and its speed regulation method

Abstract

The present application relates to the technical field of hydraulic motor, and particularly relates to a hydraulic motor based on electronic flow distribution and a speed regulating method thereof, which comprises an eccentric crankshaft, six plunger cylinders, a control assembly and a driving assembly, the six plunger cylinders are connected with the eccentric crankshaft respectively, the driving assembly is connected with the plunger cylinders, and the control assembly is connected with the eccentric crankshaft and the driving assembly respectively. An angle encoder is used to detect the real-time angle position of the eccentric crankshaft, a controller reads the current eccentric crankshaft angle value, controls the output flow of three bidirectional variable pumps, and the displacement of the three bidirectional variable pumps controls the movement speed of the six plunger cylinders, so as to determine the rotating speed of the motor. The motor speed regulation of the present application does not have a throttle valve and a throttling loss, so that the system heating can be reduced, and the rotating speed is controlled by using electronic oil distribution, so that the rotating speed is more stable and the use is safer.

Description

Technical Field

[0001] This invention relates to the field of hydraulic motor technology, and in particular to a hydraulic motor based on electronic flow distribution and its speed regulation method. Background Technology

[0002] Anchor winches are an important piece of machinery on ship decks. Anchor winches are generally driven by electric motors or hydraulic motors. Electric anchor winches mainly consist of the electrical parts of a three-speed AC drive motor, brake, electrical control box and master controller, as well as the mechanical parts of a gear reduction mechanism and clutch mechanism. They have the advantages of simple equipment and low production and maintenance costs, but they are not as good as hydraulically driven anchor winches in terms of speed and pulling force performance.

[0003] Hydraulic anchor winches use hydraulic oil as the medium. An electric motor drives a hydraulic oil pump, which in turn controls a hydraulic motor via directional valves and hydraulic oil pipelines. The five-star motor features increased housing strength and enhanced load-bearing capacity of internal dynamic components, providing a wide continuous power range for driving anchor winches. The hydraulic motor used to drive the anchor winch operates under low-speed, high-torque conditions.

[0004] Currently, the five-star motor uses a mechanical distribution method, where the distribution characteristics are determined by the mechanical structure of the distribution plate and cannot be modified. Therefore, this structure limits the minimum stable speed of the hydraulic motor. When the speed exceeds this minimum stable speed, the five-star motor's speed becomes unstable, prone to creeping, and experiences severe torque fluctuations, posing a significant safety hazard. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic motor based on electronic flow distribution and its speed regulation method, which solves the problem that when using a five-star motor to drive an anchor winch, the five-star motor speed is unstable and prone to creeping when the speed exceeds the minimum stable speed, and the torque fluctuation is serious, causing great safety hazards.

[0006] To achieve the above objectives, the present invention provides a hydraulic motor based on electronic flow distribution, comprising an eccentric crankshaft, six piston cylinders, a control assembly, and a drive assembly. The six piston cylinders are respectively connected to the eccentric crankshaft, the drive assembly is connected to the piston cylinders, and the control assembly is connected to both the eccentric crankshaft and the drive assembly.

[0007] The six plunger cylinders are divided into three groups, with two plunger cylinders in each group, and the two plunger cylinders in each group are arranged at 180 degrees.

[0008] The included angle between two adjacent plunger cylinders is 60 degrees.

[0009] The control component includes an angle encoder and a controller. The angle encoder is connected to the eccentric crankshaft, and the controller is connected to both the angle encoder and the drive component.

[0010] The drive assembly includes three bidirectional variable pumps, a drive motor, and a replenishing pump. Each bidirectional variable pump is connected to two piston cylinders in a set, and the three bidirectional variable pumps are connected to the controller. The drive motor is connected to each of the three bidirectional variable pumps, and the replenishing pump is connected to each of the three bidirectional variable pumps.

[0011] A method for speed regulation of a hydraulic motor based on electronic flow distribution includes the following steps: S1. Obtain the current eccentric crankshaft angle position through the angle encoder; S2. The controller calculates the displacement of the three bidirectional variable pumps based on the current eccentric crankshaft angle position and generates command signals. S3. The three bidirectional variable pumps output the corresponding flow rate according to the command signal; S4, the six plunger cylinders each receive the corresponding flow rate, and the eccentric crankshaft rotates; S5. Repeat steps S1 to S4, and the motor will rotate continuously.

[0012] This invention discloses a hydraulic motor based on electronic flow distribution and its speed control method. An angle encoder is used to detect the real-time angular position of the eccentric crankshaft. The controller reads the current eccentric crankshaft angle value and controls the output flow of three bidirectional variable pumps. The displacement of the three bidirectional variable pumps controls the movement speed of six piston cylinders, thereby determining the motor speed. This invention eliminates the need for a throttle valve and throttling losses in motor speed control, thus reducing system heat generation. Furthermore, the use of electronic oil distribution to control the speed promotes smoother operation and safer use. This invention solves the problem of unstable speed, creeping, and severe torque fluctuations in anchor winches driven by five-star motors, which pose significant safety hazards when the speed exceeds the minimum stable speed. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the hydraulic motor based on electronic flow distribution according to the first embodiment of the present invention.

[0015] Figure 2 This is a simulation schematic diagram of the hydraulic motor speed regulation method based on electronic flow distribution according to the second embodiment of the present invention.

[0016] Figure 3 This is the displacement curve of the bidirectional variable pump according to the second embodiment of the present invention.

[0017] Figure 4 This is the eccentric crankshaft rotation angle curve of the second embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the rotation angle of the eccentric crankshaft according to the second embodiment of the present invention.

[0019] Figure 6 This is a flowchart illustrating the steps of a hydraulic motor speed control method based on electronic flow distribution according to the second embodiment of the present invention.

[0020] In the diagram: 101-eccentric crankshaft, 102-plunger cylinder, 103-angle encoder, 104-controller, 105-bidirectional variable pump, 106-drive motor, 107-replenishing pump. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] The first embodiment of this application is as follows: Please see Figure 1 ,in, Figure 1 This is a schematic diagram of a hydraulic motor based on electronic flow distribution according to the first embodiment of the present invention. The present invention provides a hydraulic motor based on electronic flow distribution: including an eccentric crankshaft 101, six piston cylinders 102, a control component and a drive component. The control component includes an angle encoder 103 and a controller 104. The drive component includes three bidirectional variable pumps 105, a drive motor 106 and a replenishing pump 107.

[0023] In this specific embodiment, the six plunger cylinders 102 are respectively connected to the eccentric crankshaft 101, the drive assembly is connected to the plunger cylinders 102, and the control assembly is connected to both the eccentric crankshaft 101 and the drive assembly. The six plunger cylinders 102 are divided into three groups of two, with each group having two plunger cylinders arranged at 180 degrees. The included angle between any two adjacent plunger cylinders 102 is 60 degrees. The six plunger cylinders 102 are further divided into three plunger pairs, with two plunger cylinders in each pair arranged at 180 degrees. The drive assembly is connected to the oil ports of the two plunger cylinders 102 in each plunger pair. During operation, one plunger extends while the other retracts. The extension and retraction speeds are related to the displacement of the drive assembly. Different displacements of the drive assembly result in different plunger movement speeds, thus affecting the rotational speed of the eccentric crankshaft 101. The control assembly controls the displacement of the drive assembly.

[0024] The angle encoder 103 is connected to the eccentric crankshaft 101; the controller 104 is connected to both the angle encoder 103 and the drive assembly. The angle encoder 103 is used to detect the real-time angular position of the eccentric crankshaft 101, and the controller 104 reads the current angle value of the eccentric crankshaft 101 and controls the output flow of the drive assembly, thereby realizing the speed regulation of the motor.

[0025] Secondly, each of the bidirectional variable pumps 105 is connected to two of the plunger cylinders 102 in a pair, and the three bidirectional variable pumps 105 are connected to the controller 104. The drive motor 106 is connected to the three bidirectional variable pumps 105. The oil replenishment pump 107 is connected to the three bidirectional variable pumps 105. The oil replenishment pump 107 is used to replenish oil to the three bidirectional variable pumps 105 to ensure that the bidirectional variable pumps 105 work normally and do not suck in air. Each oil port of each bidirectional variable pump 105 is connected to the oil ports of the two plunger cylinders 102 in each plunger pair. When working, one plunger extends and the other plunger retracts. The speed of the plunger extension and retraction is related to the displacement of the bidirectional variable pump 105. The displacement of the bidirectional variable pump 105 is different, the movement speed of the plunger is different, and therefore the rotation speed of the eccentric crankshaft 101 is also different.

[0026] Using a hydraulic motor based on electronic flow distribution in this embodiment, the angle encoder 103 obtains the real-time angular position of the eccentric crankshaft 101. The controller 104 calculates the displacement of the three bidirectional variable pumps 105 based on the current angular position of the eccentric crankshaft 101, and controls the three bidirectional variable pumps 105 to output the corresponding flow rate. The six plunger cylinders 102 receive the corresponding flow rate, and the eccentric crankshaft 101 rotates. The above steps are repeated to make the motor rotate continuously and stably, thereby realizing the speed regulation of the motor. The displacement of the bidirectional variable pumps 105 determines the movement speed of the plunger cylinders 102, thus determining the speed of the motor. There is no throttle valve and no throttling loss, so the system heat generation can be reduced. The use of electronic oil distribution to control continuous rotation promotes more stable rotation and reduces safety hazards.

[0027] The second embodiment of this application is as follows: Based on the first embodiment, please refer to Figures 1 to 6 ,in, Figure 1 This is a schematic diagram of the hydraulic motor based on electronic flow distribution according to the first embodiment of the present invention. Figure 2 This is a simulation schematic diagram of the hydraulic motor speed regulation method based on electronic flow distribution according to the second embodiment of the present invention. Figure 3 This is the displacement curve of the bidirectional variable pump 105 according to the second embodiment of the present invention. Figure 4This is the rotation angle curve of the eccentric crankshaft 101 in the second embodiment of the present invention. Figure 5 This is a schematic diagram of the rotation angle of the eccentric crankshaft 101 according to the second embodiment of the present invention. Figure 6 This is a flowchart illustrating the steps of a hydraulic motor speed control method based on electronic flow distribution according to a second embodiment of the present invention. This embodiment of a hydraulic motor speed control method based on electronic flow distribution includes the following steps: S1. Obtain the current angular position of the eccentric crankshaft 101 through the angle encoder 103; S2, the controller 104 calculates the displacement of the three bidirectional variable pumps 105 based on the current angular position of the eccentric crankshaft 101, and generates command signals; S3. The three bidirectional variable pumps 105 output the corresponding flow rate according to the command signal; S4, the six plunger cylinders 102 respectively flow into the corresponding flow, and the eccentric crankshaft 101 rotates; S5. Repeat steps S1 to S4, and the motor will rotate continuously.

[0028] Specifically, the angle encoder 103 obtains the current position of the eccentric crankshaft 101. ; Controller 104 uses the current position of the eccentric crankshaft 101 The displacement of the bidirectional variable pumps 10, 11, and 12 is calculated; the bidirectional variable pumps 10, 11, and 12 output corresponding flow rates according to the command signal; the corresponding flow rates flow into the plunger cylinders 1-6, and the eccentric crankshaft 101 rotates; repeating the above steps, the motor can rotate continuously. As the eccentric crankshaft 101 rotates, the plunger cylinders 1-6 extend and retract regularly. For the plunger cylinder 1, the relationship between the plunger displacement and the rotation angle of the eccentric crankshaft 101 is: In the formula, For the plunger's stroke, This represents the protrusion length of the plunger. This is the rotation angle of the eccentric crankshaft 101 of the motor.

[0029] The plunger cylinder 4 is complementary and symmetrical to the plunger cylinder 1. The relationship between the displacement of the plunger 4 and the rotation angle of the eccentric crankshaft 101 is as follows: Since the six plunger cylinders 102 are evenly distributed, and the angle between plunger cylinder 2 and plunger cylinder 1 is 60°, the relationship between the displacement of plunger 2 and the rotation angle of the eccentric crankshaft 101 is as follows: Similarly, the relationship between the displacement of plunger 3 and the rotation angle of eccentric crankshaft 101 is as follows: Differentiating the above formula, the flow rates of piston cylinders 1 to 6 are obtained as follows: In the formula, the negative sign indicates that the flow direction is opposite.

[0030] Therefore, the displacement of the bidirectional variable pump 10 is: In the formula, The instantaneous displacement of the bidirectional variable pump 10, The rotational speed of the bidirectional variable pump 10.

[0031] Similarly, the displacement expressions for the bidirectional variable pump 11 and the bidirectional variable pump 12 are as follows: The angle encoder 103 is used to detect the real-time angular position of the eccentric crankshaft 101. To ensure continuous and stable rotation of the eccentric crankshaft 101, the controller 104 reads the current angle value of the eccentric crankshaft 101 and controls the output flow of the three bidirectional variable pumps 105 respectively, thereby controlling the extension and retraction of the six plunger cylinders 102 to achieve motor speed regulation. The displacement of the bidirectional variable pump 105 determines the movement speed of the plunger cylinders 102, thus determining the motor speed. Without a throttle valve and without throttling losses, system heat generation is reduced. Electronic oil distribution control ensures continuous rotation, resulting in more stable rotation and reduced safety hazards.

[0032] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A hydraulic motor based on electronic flow distribution, characterized in that, It includes an eccentric crankshaft, six plunger cylinders, a control assembly, and a drive assembly. The six plunger cylinders are respectively connected to the eccentric crankshaft, the drive assembly is connected to the plunger cylinders, and the control assembly is respectively connected to the eccentric crankshaft and the drive assembly. The six plunger cylinders are divided into three groups, with two plunger cylinders in each group, and the two plunger cylinders in each group are arranged at 180 degrees. The included angle between two adjacent plunger cylinders is 60 degrees; The control component includes an angle encoder and a controller, wherein the angle encoder is connected to the eccentric crankshaft; The controller is connected to both the angle encoder and the drive assembly. The drive assembly includes three bidirectional variable pumps, a drive motor, and a replenishing pump. Each bidirectional variable pump is connected to two piston cylinders in a set, and the three bidirectional variable pumps are connected to the controller. The drive motor is connected to each of the three bidirectional variable pumps, and the replenishing pump is connected to each of the three bidirectional variable pumps.

2. A hydraulic motor speed control method based on electronic flow distribution, applicable to the hydraulic motor based on electronic flow distribution as described in claim 1, characterized in that, Includes the following steps: S1. Obtain the current eccentric crankshaft angle position through the angle encoder; S2. The controller calculates the displacement of the three bidirectional variable pumps based on the current eccentric crankshaft angle position and generates command signals. S3. The three bidirectional variable pumps output the corresponding flow rate according to the command signal; S4, the six plunger cylinders each receive the corresponding flow rate, and the eccentric crankshaft rotates; S5. Repeat steps S1 to S4, and the motor will rotate continuously.

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