CN201330683Y - Load-sensing variable dual pump for furnace-dismantling machine - Google Patents

Abstract

The utility model relates to a load-sensing variable double pump used on a furnace dismantling machine, which is characterized in that it is composed of two plunger pumps with the same displacement, a reduction gear and a total power regulator. In the casing, it is driven by a drive shaft; the load sensing variable double pump is connected to the prime mover, that is, the diesel engine, through a connection plate, and its speed is synchronized with the speed of the engine output shaft. The two oil outlets are respectively connected with the oil inlets of the two multi-way reversing valves to form a power circuit in the hydraulic system. The utility model has the advantages of high pressure, small size, light weight, long service life and easy maintenance. It meets the requirements of complex working conditions such as many hydraulic actuators of large-scale construction machinery dismantling machines, variable control pressure, and different oil consumption of hydraulic motors and hydraulic cylinders. It not only meets the requirements of changing and complicated working conditions, but also plays the role of preventing engine or motor from overloading and saving energy.

Description

Load sensing variable twin pumps for use on demolition machines

technical field

The utility model belongs to metallurgical and mining equipment, in particular to a load sensing variable double pump used on a furnace dismantling machine.

Background technique

The furnace demolition machine is a large-scale construction machine driven by full hydraulic pressure. The crawler walking of the machine, the rotation of the car body and the rotation of the boom are all driven by hydraulic motors. The lifting, telescoping and swinging of the boom are all driven by hydraulic cylinders. The pressure and flow of the hydraulic system required for the action of each part are different. The traditional dismantling machine uses a fixed amount pump and a variable pump as the power source of the hydraulic system. The general fixed amount pump and variable pump are difficult to meet the requirements of changing and complex working conditions.

Contents of the invention

The utility model overcomes the above-mentioned defects, and aims to provide a load-sensing variable double pump as a power source of a hydraulic system for a large-scale engineering machinery furnace dismantling machine.

The utility model is used for the load sensing variable double pump on the furnace dismantling machine. Brief description of the content:

The utility model is used for the load-sensing variable double pump on the furnace demolition machine, which is composed of two plunger pumps with the same displacement, a reduction gear and a total power regulator. Piston pumps with the same displacement are installed in one housing and driven by a drive shaft. The total power regulator continuously changes the swash plate swing angle and Corresponding displacement, the swing angle of the swash plate is 7°～25°.

The load-sensing variable double pump is connected to the engine through a connection plate, and its speed is synchronized with the speed of the engine output shaft. The oil pump suction port is connected to the fuel tank oil outlet. The oil inlets are connected to form a power circuit in the hydraulic system.

The utility model is used for the load sensing variable double pump on the furnace dismantling machine, and has the advantages of high pressure, small volume, light weight, long service life and easy maintenance. It meets the requirements of complex working conditions such as many hydraulic actuators of large-scale construction machinery dismantling machines, variable control pressure, and different oil consumption of hydraulic motors and hydraulic cylinders. And because no matter how the external load changes, the output power of the pump remains constant. It ensures that the prime mover, that is, the diesel engine or the electric motor, will not be overloaded and energy-saving. It not only meets the requirements of changing and complicated working conditions, but also plays the role of preventing engine or motor from overloading and saving energy.

Description of drawings

Figure 1 is a diagram of the load-sensing variable double-pump hydraulic system used on the demolition machine

Figure 2 is the output power curve of the pump

In the figure: 1 is the load sensing variable double pump, 2 is the connecting plate, 3 is the engine, 4 is the swash plate, 5 is the oil outlet of the oil pump, 6 is the oil inlet of the multi-way reversing valve, 7 is the total power regulator, The 8th, the oil suction port of the oil pump, the 9th, the oil outlet of the fuel tank, and the 10th, the fuel tank.

Detailed ways

The utility model is used for the load-sensing variable double pump on the furnace dismantling machine to realize in this way, below in conjunction with accompanying drawing for specific description. See Fig. 1, the load sensing variable double pump 1 of the utility model used on the furnace dismantling machine is an oblique-axis plunger variable variable double pump, which is composed of two plunger pumps with the same displacement, a reduction gear and a total power regulator , Two pumps are housed in one housing and driven by a drive shaft. The total power regulator 7 is a pressure pilot control device. The swing angle of the swash plate 4 is 7°~25°. The total power regulator 7 continuously changes the two connected load sensing variables as the external load changes. The swing angle of the swash plate 4 of the pump 1 and the corresponding displacement. The swing angle of the swash plate 4 varies between 7° and 25°. When the external load increases, the system pressure also increases. At this time, the swing angle of the swash plate becomes smaller, and the flow rate also decreases. Therefore, the output power of the pump is kept constant within a certain speed, that is: N=PQ/600η

Where: N-power (kw)

P-pressure (kgf/cm ² )

  Q-displacement (L/min)

η-efficiency.

The load sensing variable double pump 1 is connected to the engine 3 through a connection plate 2, and its speed is synchronized with the speed of the output shaft of the engine 3. The oil suction port 8 of the oil pump is connected with the oil outlet port 9 of the oil tank. The two oil outlets 5 of the oil pump are respectively connected with the oil inlets 6 of the two multi-way reversing valves. In the hydraulic system, a power circuit is formed to supply hydraulic oil to the multi-way reversing valve. Each oil outlet of the pump supplies oil to the multi-way reversing valve, and at the same time, it can sense the oil pressure change of the load to the system to the total power regulator of the pump itself, and then change the variable mechanism of the pump, that is, the swing angle of the swash plate is determined by Qmax changes in the direction of Qmin, that is, the load increases, the system oil pressure increases, the output flow of the pump decreases, and the output power of the pump remains unchanged, that is, the diesel engine will not run overloaded.

As shown in Figure 2, the output power curve of the pump is a hyperbola, and the hydraulic system pressure increases and the pump output flow decreases. On the contrary, the hydraulic system pressure decreases, the pump output flow increases, and the power remains constant. The load sensing variable double pump has the advantages of high pressure, small size, light weight, long service life and easy maintenance. It meets the requirements of complex working conditions such as many hydraulic actuators of large-scale construction machinery dismantling machines, variable control pressure, and different oil consumption of hydraulic motors and hydraulic cylinders. And because no matter how the external load changes, the output power of the pump remains constant. It ensures that the prime mover, that is, the diesel engine or the electric motor, will not be overloaded and energy-saving.

Claims (2)

1. A load-sensing variable double pump used on a furnace demolition machine is composed of two plunger pumps with the same displacement, a reduction gear and a total power regulator. It is characterized in that: the load-sensing variable double pump (1 ) of two plunger pumps with the same displacement are installed in one casing, and are driven by a drive shaft. The total power regulator (7) continuously changes the two connected load sensing variables as the external load changes. The swing angle of the swash plate (4) of the pump (1), the swing angle of the swash plate (4) is 7° to 25°. 2. The load-sensing variable double pump used on the furnace disassembler according to claim 1, characterized in that: the load-sensing variable double pump (1) is connected to the engine (3) through a connecting plate (2), and its speed Synchronized with the output shaft speed of the engine (3), the oil pump suction port (8) is connected to the oil outlet port (9) of the fuel tank, and the two oil outlet ports (5) of the oil pump are respectively connected to the oil inlet ports of two multi-way reversing valves (6) are connected to form a power circuit in the hydraulic system.

Images