CN204164248U - A kind of variable mass dynamic vibration absorber by HYDRAULIC CONTROL SYSTEM - Google Patents

Abstract

The utility model discloses a variable mass power shock absorber controlled by a hydraulic system, which comprises a base and a box body arranged on the base, a piston is arranged in the box body, and the piston is connected to the top of the box body through a spring. The tank is divided into an upper cavity and a lower oil cavity by a piston, the cavity is provided with a vent hole 20, and the oil cavity is filled with hydraulic oil; one end of the oil cavity is connected to the second hydraulic oil tank through the oil inlet pipe, and the oil inlet pipe is installed with Hydraulic pump; the other end of the oil chamber is connected to the third hydraulic oil tank through an oil outlet pipe, and a control valve is installed on the oil outlet pipe. The utility model is installed on the body of a large and medium-sized punching bed. When the body vibrates under the influence of the power source, the volume of the hydraulic oil in the box is changed by starting the hydraulic control system, and finally the natural frequency of the vibration absorber is changed to make it The value is the same as the vibration frequency of the body to adapt to the vibration of the body at different frequencies, so as to achieve the effect of vibration reduction and improve the machining accuracy.

Description

A variable mass dynamic shock absorber controlled by a hydraulic system

technical field

The utility model belongs to the field of vibration reduction for controlling large and medium press machine bodies, in particular to a variable-mass dynamic vibration absorber controlled by a hydraulic system.

Background technique

With the development of science and technology, people's production and living standards are getting higher and higher. In the field of processing and production, mechanical structures are widely used. Such as a large stamping machine, it meets people's requirements for some production machinery parts, because the operation of the power source of a large stamping machine will cause the vibration of the entire machine body, although traditionally it is alleviated by controlling the isolation of the power source and the mechanical structure. mechanical vibration. However, this method of isolation and vibration reduction cannot be fully realized, and in addition, the operation of various parts inside the large-scale mechanical body will cause vibration of the body. machining accuracy. For a long time, a large number of people's research focuses on reducing the vibration of mechanical moving parts, while ignoring the influence of body vibration.

Contents of the invention

In view of the problems raised in the above prior art, the purpose of this utility model is to provide a variable mass dynamic shock absorber controlled by a hydraulic system, which can reduce the impact of the vibration of a large mechanical body on an internal part, thereby improving the machining accuracy.

In order to achieve the above tasks, the utility model adopts the following technical solutions:

A variable mass dynamic shock absorber controlled by a hydraulic system, comprising a base and a box set on the base, a piston is arranged in the box, the piston is connected to the top of the box by a spring, and the box is composed of The piston is divided into an upper cavity and a lower oil cavity, the cavity is provided with a vent hole, and the oil cavity is filled with hydraulic oil; one end of the oil cavity is connected to the second hydraulic oil tank through the oil inlet pipe, and a hydraulic pump is installed on the oil inlet pipe; the other end of the oil cavity is One end is connected to the third hydraulic oil tank through an oil outlet pipe, and a control valve is installed on the oil outlet pipe.

Further, a one-way valve is installed on the oil inlet pipe, and the one-way valve from the oil chamber to the second hydraulic oil tank is blocked.

Further, the oil inlet pipe is connected to a first oil cylinder through an overflow valve.

Further, an electric motor is installed on the hydraulic pump.

Further, an oil filter is arranged between the hydraulic pump and the second hydraulic oil tank.

Further, the box body is fixed on the base through elastic pads.

The variable mass dynamic vibration absorber of the utility model uses a hydraulic control system to change the quality of hydraulic oil in the box, that is, changes the mass unit of the dynamic vibration absorber, thereby changing the natural frequency of the vibration absorber. Install the vibration absorber on the body of the large and medium-sized punching machine, the vibration absorber can adjust its own frequency according to the change of the vibration frequency of the body, and achieve the purpose of vibration reduction after assembly. The machining accuracy is greatly improved.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

The symbols in the figure represent: 1—oil filter, 2—electric motor, 3—first hydraulic oil tank, 4—overflow valve, 5—second hydraulic oil tank, 6—hydraulic pump, 7—threaded hole, 8—base, 9 —Elastic pad, 10—Check valve, 11—Oil cavity, 12—Piston, 13—Case body, 14—Spring, 15—Oil outlet pipe, 16—Control valve, 17—The third hydraulic oil tank, 18—Oil inlet pipe, 19—cavity, 20—air vent;

Detailed ways

According to the above technical solution, as shown in Figure 1, a variable mass dynamic shock absorber controlled by a hydraulic system includes a base 8 and a box 13 arranged on the base 8, a piston 12 is arranged in the box 13, and the The piston 12 is connected to the top of the box body 13 by a spring 14. The box body 13 is divided into an upper cavity 19 and a lower oil cavity 11 by the piston 12. The cavity 19 is provided with a vent hole 20, and the oil cavity 11 is filled with Hydraulic oil; one end of the oil chamber 11 is connected to the second hydraulic oil tank 5 through the oil inlet pipe 18, and the hydraulic pump 6 is installed on the oil inlet pipe 18; the other end of the oil chamber 11 is connected to the third hydraulic oil tank 17 through the oil outlet pipe 15, and the oil outlet pipe 15 is equipped with Control valve 16.

The base 8 of the vibration absorber is screwed on the body of the large and medium-sized punching bed through the bolt hole 7, thus forming a two-degree-of-freedom system with the body. The working principle of the utility model is that the overall quality of the vibration absorber is changed by continuously adjusting the quality of the hydraulic oil in the oil chamber 11 of the box body 13. After the quality of the vibration absorber is adjusted, its natural frequency changes. According to the principle of two degrees of freedom, when the natural frequency of the vibration absorber is equal to the natural frequency of the main system on which the vibration absorber is installed, it can reduce the vibration of the main system.

Since the natural frequency of the main system body may change, the utility model adopts a piston 12 type box 13 structure, and controls the quality of the hydraulic oil by adjusting the volume of the hydraulic oil in the box 13 .

The box body 13 is a regular box body 13, and the piston 12 installed in the box body 13 is arranged parallel to the bottom surface of the box body 13, and is sliding type and interference fit with the box body 13, and moves smoothly in the box body 13. In order to make the piston 12 play a good sealing role when it slides and prevent leakage of hydraulic oil, an elastic material, such as rubber, is wrapped outside the piston 12 .

The volumes of the cavity 19 and the oil chamber 11 separated by the piston 12 are adjusted according to the position of the piston 12 . In order to balance the air pressure inside and outside the cavity 19 when the piston 12 moves toward the cavity 19, a vent hole 20 is provided on the cavity 19, preferably on the top surface of the cavity 19, so that the pressure in the oil cavity 11 is reduced, It is convenient to feed oil into the oil chamber 11.

The hydraulic pump 6 installed on the oil inlet pipe 18 is preferably a gear-type hydraulic pump 6. Through parameters such as the diameter, number of teeth, and modulus of the gear set in advance, the output flow of the hydraulic pump 6 is stable, so that the dynamic vibration absorber The mass changes steadily and is close to linear, which makes the shock absorber have good vibration reduction effect and strong controllability.

The control valve 16 installed on the oil outlet pipe 15 is preferably a manual two-position two-way valve. When the shock absorber is not working, move the control handle of the two-position two-way valve to conduct it, and discharge the hydraulic oil in the tank 13. , realize the reuse of hydraulic oil, and also increase the service life of the spring 14 of the piston 12 in the box 13.

With reference to the above-mentioned scheme of the present utility model, the working process of the present utility model is as follows:

When the shock absorber is working, the control valve 16 is closed, and the hydraulic pump 6 pumps the hydraulic oil in the second hydraulic oil tank 5 into the oil chamber 11 in the box body 13 through the oil inlet pipe 18. At this time, the piston 12 moves upward, and the box body The volume of the hydraulic oil in 13 increases, the quality of the box body 13 is changed, and the natural frequency of the vibration absorber is adjusted.

When the shock absorber is not working, open the control valve 16 and close the hydraulic pump 6. At this time, under the action of the gravity of the piston 12 and the elastic force of the spring 14, the hydraulic oil flows into the third hydraulic oil tank 17 from the oil chamber 11 through the oil outlet pipe 15 .

It is also possible to connect the third hydraulic oil tank 17 with the second hydraulic oil tank 5 to realize automatic recycling of hydraulic oil.

As a further preference, a one-way valve 10 is installed on the oil inlet pipe 18. The one-way valve 10 adopts a steel ball-sealed one-way straight-through valve. The one-way valve 10 is cut off in the direction to prevent the hydraulic oil from flowing out from the oil inlet pipe 18 when the hydraulic pump 6 is not working, thereby causing the quality of the box body 13 to change.

The oil inlet pipe 18 is also connected with the first hydraulic oil tank 3 , and the overflow valve 4 is installed on the connecting pipeline between the oil inlet pipe 18 and the first hydraulic oil tank 3 . When the hydraulic pump 6 pumps oil into the oil chamber 11 to increase the pressure in the oil chamber 11, it may exceed the elastic limit of the spring 14 and cause damage to the structure of the piston 12 inside the box 13, so the oil inlet pipe 18 passes through the overflow valve 4 It is connected to the first hydraulic oil tank 3, and when the pressure value is too large, the pressure is relieved through the overflow valve 4.

The hydraulic pump 6 can have multiple drive control methods. In this solution, the hydraulic pump 6 is equipped with a motor 2, and the hydraulic pump 6 is automatically controlled by the motor 2, which is convenient for operation.

Because the hydraulic oil often contains granular impurities, it will cause the wear of the relative moving surface of the hydraulic components, the sticking of the slide valve, and the blockage of the throttle orifice, which will greatly reduce the reliability of the system. Therefore, an oil filter 1 is arranged between the hydraulic pump 6 and the second hydraulic oil tank 5 to ensure the normal operation of the hydraulic system.

The box body 13 is fixed on the base 8 through the elastic pad 9, the elastic pad 9 has certain elasticity and damping, and is preferably made of silicon rubber, and the base 8 can be connected with the box body 13 by vulcanization.

To sum up, when the vibration frequency of the machine body is changing, the vibration absorber of the device can better absorb vibration, thereby improving the machining accuracy of large and medium-sized stamping machine tools.

Claims (6)

1. A variable mass dynamic shock absorber controlled by a hydraulic system, comprising a base (8) and a box (13) arranged on the base (8), a piston (12) is arranged in the box (13), and its characteristics The piston (12) is connected to the top of the tank (13) through a spring (14), and the tank (13) is divided into an upper cavity (19) and a lower oil chamber by the piston (12). cavity (11), the cavity (19) is provided with a vent hole (20), and the oil cavity (11) is filled with hydraulic oil; one end of the oil cavity (11) is connected to the second hydraulic oil tank (5) through the oil inlet pipe (18), and the A hydraulic pump (6) is installed on the oil pipe (18); the other end of the oil chamber (11) is connected to the third hydraulic oil tank (17) by an oil outlet pipe (15), and a control valve (16) is installed on the oil outlet pipe (15). the 2. The variable mass dynamic shock absorber controlled by a hydraulic system as claimed in claim 1, characterized in that a check valve (10) is installed on the oil inlet pipe (18), from the oil chamber (11) to the second The directional check valve (10) of the two hydraulic oil tanks (5) is cut off. the 3. The variable mass dynamic shock absorber controlled by a hydraulic system according to claim 1, characterized in that the oil inlet pipe (18) is connected to a first hydraulic oil tank (3) through an overflow valve (4). the 4. The variable mass dynamic shock absorber controlled by a hydraulic system according to claim 1, characterized in that an electric motor (2) is installed on the hydraulic pump (6). the 5. The variable mass dynamic shock absorber controlled by a hydraulic system according to claim 1, characterized in that an oil filter (1) is arranged between the hydraulic pump (6) and the second hydraulic oil tank (5). the 6. The variable mass dynamic shock absorber controlled by a hydraulic system according to claim 1, characterized in that, the box (13) is fixed on the base (8) through an elastic pad (9). the