Duplex pump control type hydraulic synchronizing system

Abstract

The utility model discloses a duplex pump control type hydraulic synchronizing system which comprises a hydraulic oil tank and a driving motor, the hydraulic oil tank is respectively connected with two oil inlets of a same-displacement duplex pump through a main pipeline, and an output shaft of the driving motor is connected with a transmission shaft of the same-displacement duplex pump. An oil outlet in the left side of the same-displacement duplex pump is connected with the left hydraulic cylinder through a left oil outlet pipeline, an oil outlet in the right side of the same-displacement duplex pump is connected with the right hydraulic cylinder through a right oil outlet pipeline, and the movable end of the left hydraulic cylinder and the movable end of the right hydraulic cylinder are connected with a lifting load. Compared with a traditional valve control mode, a loop is simpler, the double pump with the same displacement serves as a power unit and a control unit at the same time, the valve control link and a mechanical synchronization mechanism are omitted, the size is smaller, efficiency is higher, and the double pump is particularly suitable for integrated equipment with a hydraulic system.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control of metallurgical equipment, in particular to a double pump-controlled hydraulic synchronization system. Background Art

[0002] Many heavy-duty equipment controlled by dual hydraulic cylinders, such as aluminum strip sewing machines, shearing machines, and lifts, require both motion control and synchronization between the two hydraulic cylinders to balance the load. Traditional processes typically use valve control, which requires valve control links and mechanical synchronization mechanisms. These complex circuits, large size, and low efficiency make them inefficient for today's integrated equipment with built-in hydraulic systems. To address this, we propose a dual-pump-controlled hydraulic synchronization system. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a dual pump-controlled hydraulic synchronization system, which eliminates the valve control link and mechanical synchronization mechanism, is smaller in size and more efficient, and is particularly suitable for integrated equipment with its own hydraulic system, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a double pump-controlled hydraulic synchronization system, comprising a hydraulic oil tank and a drive motor, wherein the hydraulic oil tank is respectively connected to the two oil inlets of the double pump with the same displacement through the main pipeline, the output shaft of the drive motor is connected to the transmission shaft of the double pump with the same displacement, the oil outlet on the left side of the double pump with the same displacement is connected to the left hydraulic cylinder through the left oil outlet pipeline, the oil outlet on the right side of the double pump with the same displacement is connected to the right hydraulic cylinder through the right oil outlet pipeline, and the movable ends of the left hydraulic cylinder and the right hydraulic cylinder are connected to the lifting load.

[0005] As an optimal technical solution of the present invention, a left branch pipe is provided on the left oil outlet pipeline, and a left pressure gauge is provided on the left branch pipe; a right branch pipe is provided on the right oil outlet pipeline, and a right pressure gauge is provided on the right branch pipe.

[0006] As a preferred technical solution of the present invention, a left pressure sensor is provided on the left branch pipe, and a right pressure sensor is provided on the right branch pipe.

[0007] As a preferred technical solution of the present invention, the left branch pipe and the right branch pipe are connected to each other, and a stop valve is provided at the connection between the left branch pipe and the right branch pipe.

[0008] As an optimal technical solution of the present invention, a left overflow pipeline is arranged between the hydraulic oil tank and the left oil outlet pipeline, and a left overflow valve is arranged on the left overflow pipeline; a right overflow pipeline is arranged between the hydraulic oil tank and the right oil outlet pipeline, and a right overflow valve is arranged on the right overflow pipeline.

[0009] Compared with the existing technology, the beneficial effects of the present invention are: compared with the traditional valve control method, the circuit is simpler, the double pump with the same displacement is both a power unit and a control unit, eliminating the valve control link and mechanical synchronization mechanism, smaller in size and higher in efficiency, and is especially suitable for integrated equipment with its own hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model.

[0011] In the figure: 1 hydraulic oil tank, 2 duplex pumps with the same displacement, 3 drive motor, 4 left overflow valve, 5 left pressure gauge, 6 left pressure sensor, 7 stop valve, 8 right pressure sensor, 9 right pressure gauge, 10 right overflow valve, 11 left hydraulic cylinder, 12 right hydraulic cylinder. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] See also Figure 1 The present invention provides a technical solution: a twin pump-controlled hydraulic synchronization system comprising a hydraulic oil tank 1 and a drive motor 3. The hydraulic oil tank 1 is connected to the two oil inlets of a twin pump 2 of the same displacement via a main pipeline. The output shaft of the drive motor 3 is connected to the transmission shaft of the twin pump 2 of the same displacement. The left oil outlet of the twin pump 2 of the same displacement is connected to the left hydraulic cylinder 11 via the left oil outlet pipeline, and the right oil outlet of the twin pump 2 of the same displacement is connected to the right hydraulic cylinder 12 via the right oil outlet pipeline. The movable ends of the left and right hydraulic cylinders 11 and 12 are connected to the lifting load. The drive motor 3 drives the twin pump 2 of the same displacement to rotate. Oil is drawn from the hydraulic oil tank 1 and supplied to the left and right hydraulic cylinders 11 and 12, respectively. The pressurized oil pushes the hydraulic cylinders upward to lift the load. When the load returns, the pump stops and falls due to its own weight. The pump passively reverses and the oil returns to the tank. The motor can also be actively reversed to speed up the return. Because the twin pumps have the same displacement and the same oil flow rate entering the hydraulic cylinders, the hydraulic cylinders are synchronized.

[0014] Compared with the traditional valve control method, the circuit of this design is simpler. The double pump 2 with the same displacement is both a power unit and a control unit, eliminating the valve control link and mechanical synchronization mechanism. It is smaller in size and more efficient, and is especially suitable for integrated equipment with its own hydraulic system. Compared with the pump control method of using a double-output shaft motor to drive two pumps, the motor cost is low, which reduces the design cost, and the double-output shaft motor has no cooling fan and can only run for a short time (a few minutes). Continuous operation will burn the motor. This application uses a standard single-output shaft motor to drive the double pump with the same displacement. The motor has its own fan to ensure continuous operation and the cost is lower.

[0015] The driving motor 3 preferably adopts a variable frequency motor. By controlling the motor variable frequency speed regulation, the lifting speed of the hydraulic cylinder can be controlled. The load speed can be set according to needs and the acceleration and deceleration control can be performed during the start and stop process to ensure smooth operation of the load and prevent vibration caused by high-speed start and stop impact.

[0016] The preferred technical solution is that a left branch pipe is provided on the left oil outlet pipeline, and a left pressure gauge 5 is provided on the left branch pipe; a right branch pipe is provided on the right oil outlet pipeline, and a right pressure gauge 9 is provided on the right branch pipe. The left pressure gauge 5 and the right pressure gauge 9 are used to observe the pressures on the left and right sides; a left pressure sensor 6 is provided on the left branch pipe, and a right pressure sensor 8 is provided on the right branch pipe. The left pressure sensor 6 and the right pressure sensor 8 detect the pressure signals on the left and right sides to meet the automatic control needs such as load arrival confirmation, pressure alarm, and pressure recording.

[0017] In a preferred technical solution, the left branch pipe and the right branch pipe are connected to each other, and a stop valve 7 is provided at the connection between the left branch pipe and the right branch pipe. The stop valve 7 connects the left and right oil circuits. The valve is normally closed during normal operation and is only opened at the beginning of operation to fill the oil cylinders on both sides with oil when they are in the extreme equilibrium position, thereby eliminating the volume difference on both sides caused by pipeline differences or other factors.

[0018] A further preferred technical solution is that a left overflow pipeline is provided between the hydraulic oil tank 1 and the left oil outlet pipeline, and a left overflow valve 4 is provided on the left overflow pipeline; a right overflow pipeline is provided between the hydraulic oil tank 1 and the right oil outlet pipeline, and a right overflow valve 10 is provided on the right overflow pipeline. The left overflow valve 4 and the right overflow valve 10 are used to set the safety pressures on the left and right sides respectively. When the pressure exceeds the set value, the pressure oil overflows back to the oil tank through the overflow valve to prevent overpressure, thereby ensuring safety.

[0019] The same-displacement double pump 2, drive motor 3, left overflow valve 4, left pressure gauge 5, left pressure sensor 6, stop valve 7, right pressure sensor 8, right pressure gauge 9 and right overflow valve 10 used in this application are all electronic components commonly used in the prior art. Their specific structure, working principle and circuit connection are all well-known technologies and will not be described in detail here.

[0020] According to the instructions Figure 1 As shown in the schematic diagram, load calculations determine the diameter and stroke of the hydraulic cylinders on both sides of the hydraulic system's operating pressure. The hydraulic pump's operating flow rate is then calculated based on the operating speed requirements. This completes the selection of the hydraulic pump, drive motor, and other accessories. The oil tank capacity is determined by calculating the cavity size based on the hydraulic cylinder's stroke. Based on these calculations and selection data, the integrated hydraulic control device is designed. It should be noted that to ensure synchronization accuracy, the hydraulic lines on both sides are designed as symmetrically as possible.

[0021] The undisclosed parts of the present invention are all prior art, and their specific structures, materials and working principles will not be described in detail. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double pump-controlled hydraulic synchronization system, characterized in that: The invention comprises a hydraulic oil tank (1) and a drive motor (3), wherein the hydraulic oil tank (1) is respectively connected to two oil inlets of a double pump (2) of the same displacement through a main pipeline, the output shaft of the drive motor (3) is connected to the transmission shaft of the double pump (2) of the same displacement, the oil outlet on the left side of the double pump (2) of the same displacement is connected to a left hydraulic cylinder (11) through a left oil outlet pipeline, the oil outlet on the right side of the double pump (2) of the same displacement is connected to a right hydraulic cylinder (12) through a right oil outlet pipeline, the left hydraulic cylinder (11) and the right hydraulic cylinder ( 12) is connected to the lifting load at its movable end; the left oil outlet pipeline is provided with a left branch pipe, and the left branch pipe is provided with a left pressure gauge (5); the right oil outlet pipeline is provided with a right branch pipe, and the right branch pipe is provided with a right pressure gauge (9); the left branch pipe and the right branch pipe are connected to each other, and a stop valve (7) is provided at the connection between the left branch pipe and the right branch pipe, the stop valve (7) connects the left oil outlet pipeline and the right oil outlet pipeline, and the stop valve (7) is normally closed during normal operation and is opened only at the beginning of operation.

2. A double pump-controlled hydraulic synchronization system according to claim 1, characterized in that: The left branch pipe is provided with a left pressure sensor (6), and the right branch pipe is provided with a right pressure sensor (8).

3. A double pump-controlled hydraulic synchronization system according to claim 1, characterized in that: A left overflow pipeline is provided between the hydraulic oil tank (1) and the left oil outlet pipeline, and a left overflow valve (4) is provided on the left overflow pipeline; a right overflow pipeline is provided between the hydraulic oil tank (1) and the right oil outlet pipeline, and a right overflow valve (10) is provided on the right overflow pipeline.

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