阅读说明：本技术 一种摇臂重力平衡机构 (Rocker arm gravity balance mechanism ) 是由 王宝龙 周晶晶 沈国喜 张瑜 于 2020-10-30 设计创作，主要内容包括：本发明涉及一种摇臂重力平衡机构,包括底座、位置调整装置、摇臂、弹簧、轻质牵引绳和导向套。弹簧拉力产生的扭矩完全抵消了摇臂自重产生的扭矩,操纵力只需克服系统摩擦,同一位置的不同方向操纵力感完全相同。(The invention relates to a rocker arm gravity balance mechanism which comprises a base, a position adjusting device, a rocker arm, a spring, a light traction rope and a guide sleeve. The torque generated by the tension of the spring completely offsets the torque generated by the self weight of the rocker arm, the operating force only needs to overcome the friction of the system, and the operating force feelings in different directions at the same position are completely the same.)

1. The utility model provides a rocking arm gravity balance mechanism which characterized in that: comprises a base, a position adjusting device, a rocker arm, a spring, a light traction rope and a guide sleeve;

the lower end of the rocker arm is rotatably connected with the base through a rotating shaft, so that the rocker arm can swing by taking the axis of the rotating shaft as the center of a circle;

one end of the light traction rope is connected to a rope connecting point of the rocker arm, and the other end of the light traction rope penetrates through the guide sleeve and then is connected with the lower end of the spring;

the upper end of the spring is fixedly connected with the position adjusting device;

the distance B between the lower port of the guide sleeve and the axis of the rotating shaft is equal to the distance r between the rope connecting point and the axis of the rotating shaft;

the distance B from the lower port of the guide sleeve to the axis of the rotating shaft is smaller than 1/2 of the length of the light traction rope;

the spring is coaxial with the guide sleeve, and the axis is vertical to the horizontal plane and passes through the circle center

The position adjusting device is used for adjusting the spatial position of the spring, so that when the rocker arm is upwards vertical to the horizontal plane, the light traction rope is straightened, the rocker arm is not pulled by the light traction rope, and the spring only bears the gravity action of the light traction rope;

the elastic coefficient K of the spring, the gravity G of the rocker arm and the gravity center movement radius R of the rocker arm_GThe distance B between the lower port of the guide sleeve and the axis of the rotating shaft has the following relational expression: k ═ GR_G/B²The unit N/m.

2. The rocker arm gravity balance mechanism of claim 1, wherein: and frictional resistance exists between the rocker arm and the base, and the frictional resistance is greater than the gravity of the light traction rope.

3. The rocker arm gravity balance mechanism of claim 1, wherein: the guide sleeve and the light hauling cable are in clearance fit, and the clearance is smaller than 0.1 mm.

4. The rocker arm gravity balance mechanism of claim 1, wherein: the light hauling cable is made of non-elastic materials.

5. The rocker arm gravity balance mechanism of claim 4, wherein: the light hauling cable is made of nylon fibers, carbon fibers or cotton threads.

6. The rocker arm gravity balance mechanism of claim 1, wherein: the position adjusting device is fixedly arranged relative to the base, and can realize three-coordinate-axis positioning.

7. The rocker arm gravity balance mechanism of claim 1, wherein: the connecting line of the installation position of the position adjusting device and the circle center is vertical to the horizontal plane, and the other end of the spring can be vertically adjusted on the position adjusting device.

8. The rocker arm gravity balance mechanism of any one of claims 1 to 7, wherein: the spring is a coil spring.

9. The rocker arm gravity balance mechanism of any one of claims 1 to 8, wherein: the rope connecting point is positioned between the center of gravity of the rocker arm and the circle center.

Technical Field

The invention relates to the technical field of mechanical device control, and particularly provides a gravity balance mechanism for a rocker arm.

Background

The control rod is a device commonly used in the field of mechanical equipment, the control rod is obviously developed towards the direction of integration, more and more control functions are integrated on the control rod, the weight of the control rod is heavier and heavier, and then the control rod has the following defects due to the self weight: 1. the joystick rotates downward due to its own weight. 2. When the operating lever is lifted upwards, the dead weight of the operating lever needs to be overcome, so that the labor is wasted, and when the operating lever is pushed downwards, the trend of the dead weight of the operating lever is the same as that of the operating lever, so that the labor is saved or no force is used, even a slight upward force is needed to prevent the operating lever from rotating downwards, and therefore, the operating force feeling of lifting upwards and pushing downwards are different.

In the prior art, the torque of a torsion spring is used for counteracting the dead weight torque of the operating lever, because the downward torque generated by the dead weight of the operating lever is changed in a sine way, while the torque of the torsion spring is changed in a linear way, and the torque of the torsion spring which is changed in a linear way is impossible to be completely counteracted by counteracting the dead weight torque of the operating lever which is changed in a sine way; or the dead weight torque of the operating rod is counteracted in a mode of symmetrical balance weight, and the method greatly increases the weight of the equipment. The invention provides a technical scheme capable of realizing full-time balance of the operating lever at 360 degrees, and the dead weight torque of the operating lever can be perfectly offset.

Disclosure of Invention

The purpose of the invention is as follows: the torque caused by the self weight of the rocker arm is offset, so that the force difference of the operating lever in rotating operation in different directions is reduced.

The technical scheme of the invention is as follows: the rocker arm gravity balance mechanism comprises a base, a position adjusting device, a rocker arm, a spring, a light traction rope and a guide sleeve;

the lower end of the rocker arm is rotatably connected with the base through a rotating shaft, so that the rocker arm can swing by taking the axis of the rotating shaft as the center of a circle;

one end of the light traction rope is connected to a rope connecting point of the rocker arm, and the other end of the light traction rope penetrates through the guide sleeve and then is connected with the lower end of the spring;

the upper end of the spring is fixedly connected with the position adjusting device;

the distance B between the lower port of the guide sleeve and the axis of the rotating shaft is equal to the distance r between the rope connecting point and the axis of the rotating shaft;

the distance B from the lower port of the guide sleeve to the axis of the rotating shaft is smaller than 1/2 of the length of the light traction rope;

the spring is coaxial with the guide sleeve, and the axis is vertical to the horizontal plane and passes through the circle center

The position adjusting device is used for adjusting the spatial position of the spring, so that when the rocker arm is upwards vertical to the horizontal plane, the light traction rope is straightened, the rocker arm is not pulled by the light traction rope, and the spring only bears the gravity action of the light traction rope;

the elastic coefficient K of the spring, the gravity G of the rocker arm and the gravity center movement radius R of the rocker arm_GThe distance B between the lower port of the guide sleeve and the axis of the rotating shaft has the following relational expression: k ═ GR_G/B²The unit N/m.

The working principle is as follows: when the gravity center of the rocker arm 3 is right above the axle center of the rotating shaft, the force arm is zero, and the rocker arm is in a balanced state. When the rocker arm 3 rotates around the axle center of the rotating shaft by alpha, the moment arm of the dead weight G of the rocker arm 3 to the axle center of the rotating shaft is equal to R_GSin α, so that the torque generated by the dead weight G of the rocker arm 3 to the center of the shaft is equal to G R_GSin α, spring 4 is stretched 2 × B × sin (α/2), the spring has a stiffness coefficient K, so the tension of spring 4 is equal to K × 2 × B × sin (α 0/2), and the moment arm of the tension of spring 4 to the center of the shaft is equal to B × cos (α 1/2), so the tension of spring 4 generates a torque to the center of the shaft equal to K2 × B sin (α/2) × B cos (α/2). The dead weight of the rocker arm 3 and the two torques generated by the tension of the spring 4 are opposite in direction, so that the two torques are equal in magnitude, namely G a sin α is K2B sin (α/2) B cos (α/2), and K GR can be obtained by substituting sin α into 2 sin (α/2) cos (α/2) into the formula_G/B²So when the stiffness coefficient K of the spring 4 is equal to GR_G/B²The rocker arm 3 is in a balanced state.

When the gravity center of the rocker arm 3 is right below the axle center of the rotating shaft, the force arm is zero, and the rocker arm is in a balanced state.

For the structure of the technical scheme, the following arrangement can be further provided:

furthermore, frictional resistance exists between the rocker arm and the base, and the frictional resistance is greater than the gravity of the light traction rope.

Furthermore, the guide sleeve is in clearance fit with the light traction rope, and the clearance is smaller than 0.1 mm.

Furthermore, the light hauling cable is made of non-elastic materials. Preferably, the light hauling cable is made of nylon fibers, carbon fibers or cotton threads.

Furthermore, the position adjusting device is fixedly arranged relative to the base, and the position adjusting device can realize three-coordinate axis positioning.

Furthermore, a connecting line between the installation position of the position adjusting device and the circle center is perpendicular to the horizontal plane, and the other end of the spring can be vertically adjusted on the position adjusting device.

Further, the spring is a coil spring.

Further, the rope connecting point is located between the center of gravity of the rocker arm and the circle center.

The invention has the beneficial effects that: the torque generated by the tension of the spring completely offsets the torque generated by the self weight of the rocker arm, the operating force only needs to overcome the friction of the system, and the operating force feelings in different directions at the same position are completely the same.

Drawings

The illustrative examples, as well as a preferred mode of use, further objectives, and descriptions thereof, will best be understood by reference to the following detailed description of an example of the present invention when read in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic view of a rocker arm gravity balance mechanism provided by the present invention;

FIG. 2 is a schematic diagram of the balance of the gravity balance mechanism of the rocker arm provided by the present invention;

wherein, 1-base, 2-position adjusting device, 3-rocker arm, 4-spring, 5-light traction rope, 6-guide sleeve, gravity G of rocker arm, and motion radius R of gravity center of rocker arm_GThe distance B from the lower port of the guide sleeve to the axis of the rotating shaft, the circle center O, a rope connecting point M and the distance r from the rope connecting point to the axis of the rotating shaft.

Detailed Description

The disclosed examples will be described more fully with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. Indeed, many different examples may be described and should not be construed as limited to the examples set forth herein. Rather, these examples are described so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In an embodiment, referring to fig. 1, a gravity balance mechanism for a rocker arm is provided, which includes a base, a position adjusting device, a rocker arm, a spring, a light pulling rope, and a guide sleeve;

the lower end of the rocker arm is rotatably connected with the base through a rotating shaft, so that the rocker arm can swing by taking the axis of the rotating shaft as the center of a circle;

one end of the light traction rope is connected to a rope connecting point of the rocker arm, and the other end of the light traction rope penetrates through the guide sleeve and then is connected with the lower end of the spring;

the upper end of the spring is fixedly connected with the position adjusting device;

the distance B between the lower port of the guide sleeve and the axis of the rotating shaft is equal to the distance r between the rope connecting point and the axis of the rotating shaft;

the distance B from the lower port of the guide sleeve to the axis of the rotating shaft is smaller than 1/2 of the length of the light traction rope;

the spring is coaxial with the guide sleeve, and the axis is vertical to the horizontal plane and passes through the circle center

The position adjusting device is used for adjusting the spatial position of the spring, so that when the rocker arm is upwards vertical to the horizontal plane, the light traction rope is straightened, the rocker arm is not pulled by the light traction rope, and the spring only bears the gravity action of the light traction rope;

the elastic coefficient K of the spring, the gravity G of the rocker arm and the gravity center movement radius R of the rocker arm_GThe distance B between the lower port of the guide sleeve and the axis of the rotating shaft has the following relational expression: k ═ GR_G/B²The unit N/m.

And frictional resistance exists between the rocker arm and the base, and the frictional resistance is greater than the gravity of the light traction rope.

The guide sleeve and the light hauling cable are in clearance fit, and the clearance is smaller than 0.1 mm.

The light hauling cable is made of non-elastic materials. The light hauling cable is made of nylon fiber.

The connecting line of the installation position of the position adjusting device and the circle center is vertical to the horizontal plane, and the other end of the spring can be vertically adjusted on the position adjusting device.

The spring is a coil spring.

The rope connecting point is positioned between the center of gravity of the rocker arm and the circle center.

Different examples of the systems, devices, and methods disclosed herein include various components, features, and functions. It should be understood that the various examples of the systems, devices, and methods disclosed herein may include any of the components, features, and functions of any of the other examples of the systems, devices, and methods disclosed herein in any combination or sub-combination, and all such possibilities are intended to fall within the scope of the present invention.

The description of the different advantageous arrangements has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the examples in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, the different advantageous examples may describe different advantages as compared to other advantageous examples. The example or examples selected are chosen and described in order to best explain the principles of the examples, the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various examples with various modifications as are suited to the particular use contemplated.