CN101813130A - Air flotation device following motion trail of lifting point at overlength distance without being influenced by disturbing force of air tube - Google Patents

Abstract

The invention relates to an air flotation device following the motion trail of a lifting point at an overlength distance without being influenced by the disturbing force of an air tube, comprising an air flotation shaft, an air flotation sleeve and a guide track, wherein the air flotation sleeve is sleeved on the air flotation shaft and comprises a left air flotation sleeve and a right air flotation sleeve; the left air flotation sleeve is sleeved at the left side of the air flotation shaft, and the right air flotation sleeve is sleeved at the right side of the air flotation shaft; the middle of the air flotation shaft is provided with a lifting bed; the lifting bed is connected with a lifting rope; the lifting rope moves along with a motion member; a slide block is slidably arranged on the guide track and is fixedly connected with the left air flotation sleeve and the right air flotation sleeve; the slide block is connected with a main air tube; the main air tube is communicated with a left branched air tube and a right branched air tube; the left branched air tube is connected with the left air flotation sleeve, and the right branched air tube is connected with the right air flotation sleeve. The air flotation device effectively prevents the resistance influence generated by the air tube in the frictionless motion process of an air flotation assembly along with the motion member, has good reliability and follows the motion trail of the lifting point at the overlength distance without being influenced by the disturbing force of the air tube.

Description

An air flotation device that follows the movement trajectory of the lifting point over a long distance and is not affected by the disturbance force of the trachea

technical field

The invention relates to an air flotation device, in particular to a frictionless air flotation device for realizing linear motion.

Background technique

Air bearing, also known as air bearing, is a kind of bearing. It injects compressed gas into the shaft cavity, and the air film separates the two moving surfaces like lubricant, so that the air bearing shaft set in the bearing is suspended. , where the thickness of the air film is between 1 and 10 microns. Compared with ordinary bearings, in addition to non-contact and frictionless relative motion, air bearings have advantages in higher rotational accuracy, high speed, reduced vibration, high shock resistance, extended service life, reduced pollution and increased axial/radial load capacity, etc. .

For example, "Air Bearing Structure and Linear Driving Device Using Air Bearing Structure" patent application number CN200510085338.2 discloses a linear driving device including a linear motor that uses an air bearing structure to achieve high-precision motion. Patent application No. CN200610156698.1 "Air Bearing and Its Installation Method and Linear Driving Device with Air Bearing" also discloses a design that utilizes air bearings to realize frictionless horizontal side sliding on guide rails. Although the above two patents all relate to the design of the linear drive device, they both focus on the design of the air bearings controlled by magnetism, and do not involve the long-distance follow-up design of the moving parts.

In addition to the application of the air suspension system in the field of rotation of the air bearing shaft, due to the non-contact and frictionless characteristics of the two surfaces, it can also be well applied in the field of axial movement of the air bearing shaft. For example, in the patent application number CN200710071515. "Air Suspension Magnetic Frictionless Suspension Device" discloses an air suspension device that uses an air bearing shaft in the field of vertical frictionless motion, in which two air bearings are used to well realize the vertical shaft rotation Frictionless movement.

In addition to the above design, the use of the frictionless characteristics of air bearings to achieve frictionless movement with moving parts in the horizontal direction has also been widely used. The solution shown in Figure 1 is one: tie the moving part 1 to the air bearing 2 (air bearing), the air bearing 2 is directly placed on the air shaft 3, and the compressed gas is supplied to the air bearing 2 through the air pipe 4 Air is supplied to generate an air film between the air bearing sleeve 2 and the air bearing shaft 3. When the moving part 1 moves axially along the air bearing shaft 3, the air bearing sleeve 2 is required to follow the moving part 1 to do the same movement at any time, and There is no friction between the air bearing sleeve 2 and the air bearing shaft 3, thereby avoiding the impact on the moving part 1 due to friction. Such systems are of great significance in the field of high-precision motion control and measurement.

However, in order to ensure the bearing capacity of the air bearing sleeve, the air gap between the air bearing sleeve and the air bearing shaft is required to be in the order of microns, so the machining accuracy of the coaxiality of the air bearing shaft is very high. On the other hand, due to the gravitational effect of moving parts, air bearing shafts, air bearing sleeves, etc., the bending stiffness of the material of the air bearing shaft is very high. As the moving distance of the moving parts increases, the length of the air bearing shaft increases. Because the air bearing shaft is a slender rod, it is very difficult to process to ensure the gap between the entire length of the air bearing shaft and the air bearing sleeve. Therefore, it is almost impossible to process the air bearing shaft when it can be used in ultra-long distance situations. This solution can achieve short-distance frictionless movement, but it is almost impossible to achieve long-distance or even ultra-long-distance frictionless movement. Even if the ultra-long-distance and high-precision air bearing shaft can be processed, it is difficult to transport and install, and it is also difficult to maintain. Once there is a problem with the air bearing shaft, it must be replaced.

On the other hand, in order to ensure air flotation, a certain pressure of compressed gas must enter between the shaft and the sleeve to generate an air film. There are two ways to connect the trachea, through the air flotation shaft or through the air flotation sleeve. For axial movement, air is usually supplied by the air flotation sleeve, that is, the compressed gas is connected to the air flotation sleeve through the air pipe, and the air hole inside the air flotation sleeve discharges the gas to form an air film. This type of connection is convenient and the air consumption is small. If the air flotation shaft is used for gas supply, that is, the compressed gas is connected to the air flotation shaft through the air pipe, and the gas discharged from the air holes outside the air flotation shaft forms an air film between the air flotation sleeve. For axial movement in this way, since the air bearing shaft is much longer than the air bearing sleeve, it is necessary to ensure that there are air holes in the entire movement range of the air bearing sleeve, so the gas leakage is large, and the leakage increases with the length of the air bearing shaft The amount is so huge that it cannot be realized in practical engineering applications. But no matter which method is used to supply air, the compressed gas must be connected through the air pipe. When the air bearing shaft or the air bearing sleeve moves axially, the air pipe also needs to move, which will cause the air pipe to bend. Because the air pipe has a certain rigidity, this There may be additional force effects. The additional force generated will inevitably be transmitted to the moving parts, thus affecting the spatial position and movement of the moving parts

Contents of the invention

In order to overcome the inability of the existing air flotation device to realize ultra-long-distance movement, and the resistance effect of the trachea and poor reliability, the present invention provides a device that can effectively avoid the resistance effect of the trachea during the frictionless movement of the air flotation component with the moving parts. , An ultra-long-distance air flotation device that follows the movement track of the lifting point and is not affected by the disturbance force of the trachea with good reliability.

The technical solution adopted by the present invention to solve its technical problems is:

An air flotation device that is not affected by the disturbance force of the trachea and follows the movement track of the lifting point over a long distance, an air flotation shaft and an air flotation sleeve, the air flotation sleeve is set on the air flotation shaft, and the air flotation sleeve includes a left The air bearing sleeve and the right air bearing sleeve, the left air bearing sleeve is set on the left side of the air bearing shaft, the right air bearing sleeve is set on the right side of the air bearing shaft, and the middle part of the air bearing shaft is installed A suspension seat, the suspension seat is connected with a suspension rope, and the suspension rope follows the moving part, and the air flotation device also includes a guide rail, on which a slider is slidably installed, and the The slider is fixedly connected with the left air-floating sleeve and the right air-floating sleeve; the slider is connected with the main trachea, the main trachea communicates with the left bronchus and the right bronchus, and the left bronchus is connected with the left air-floating sleeve. The right bronchus is connected with the right air-floating sleeve.

Further, the left air bearing sleeve and the right air bearing sleeve are respectively connected to mounting seats, and the mounting seats are fixedly connected to the slider.

Still further, the air flotation device also includes a position sensor for judging whether the suspension seat deviates from the middle position of the left and right air flotation sleeves to a set value. between sets.

The position sensor is a Hall sensor and a permanent magnet, the Hall sensor is installed on the left air bearing sleeve and the right air bearing sleeve, and the permanent magnet is installed on the suspension seat. Of course, other position sensors such as photoelectric sensors or other non-contact proximity switches may also be used.

The air bearing shaft moves without friction according to the position of the lifting point of the moving parts. According to the detection of the position of the suspension seat, the drive source such as the motor is actively controlled, and the movement of the slider is controlled by various conventional methods such as ball screws, synchronous belts, belts or wire ropes, ensuring The suspension seat is close to the center of the two air bearing sleeves. In this way, it can be ensured that the air bearing shaft remains friction-free at all times when moving over long distances.

The beneficial effects of the present invention are mainly manifested in that: the air bearing shaft moves without friction according to the position of the lifting point of the moving part, and according to the detection of the position of the suspension seat, through a driving source such as a motor, through various types of motors such as a ball screw, a synchronous belt, a belt or a wire rope, etc. Control the movement of the slider in a conventional way, and ensure that the suspension seat is located in the center of the two air bearing sleeves as much as possible. In this way, it can be ensured that the air bearing shaft remains friction-free at all times when moving over long distances.

At the same time, because the air flotation device is supplied with air through the air flotation sleeve, and the moving part is fixed on the air flotation shaft, the force generated by the bending of the trachea when the device moves only acts on the air flotation sleeve and will not be transmitted to the air flotation shaft. , so that there will be no resistance to the moving parts connected to the air bearing shaft.

Description of drawings

Fig. 1 is a schematic diagram of a conventional air bearing shaft follower.

Fig. 2 is a structural diagram of the air flotation device used for ultra-long-distance following the movement track of the lifting point according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Fig. 2, an air flotation device that follows the movement trajectory of the lifting point over a long distance without being affected by the disturbance force of the trachea includes an air flotation sleeve 2 and an air flotation shaft 3, and the air flotation sleeve 2 is set on the air flotation shaft 3 Above, the air bearing sleeve includes a left air bearing sleeve and a right air bearing sleeve, the left air bearing sleeve is fitted on the left side of the air bearing shaft, and the right air bearing sleeve is fitted on the air bearing shaft 3 On the right side, a hanging seat 4 is installed in the middle of the air bearing shaft 3, the hanging seat 4 is connected with a hanging rope, and the hanging rope moves with the moving part 1, and the air floating device also includes a guide rail 5. A slider 6 is slidably installed on the guide rail 5, and the slider 6 is fixedly connected with the left air bearing sleeve and the right air bearing sleeve; the slider 6 is connected with the main air pipe 7, and the main air pipe 7 is connected with the The left bronchus 8 and the right bronchus 9 communicate, the left bronchus 8 is connected with the left air-floating sleeve, and the right bronchus 9 is connected with the right air-floating sleeve.

The left air bearing sleeve and the right air bearing sleeve are respectively connected to mounting seats 10 , and the mounting seats 10 are fixedly connected to the slider 6 .

The air flotation device also includes a position sensor for judging whether the suspension base deviates from the middle position of the left and right air flotation sleeves to a set value, and the position sensor is installed between the suspension base and the left air flotation sleeve and the right air flotation sleeve .

The position sensor is a Hall sensor 11 and a permanent magnet 12 , the Hall sensor 11 is installed on the left air bearing sleeve and the right air bearing sleeve, and the permanent magnet 12 is installed on the hanging base 4 . Of course, other position sensors such as photoelectric sensors or other non-contact proximity switches may also be used.

The cross-section of the air bearing shaft can be circular or non-circular, such as rectangular, and the non-circular cross-section air bearing can prevent the shaft from rotating.

In this embodiment, when the moving part 1 moves for a short distance in a direction parallel to the axial direction of the air bearing shaft 3 , the air bearing shaft 3 is dragged to follow the axial direction of the air bearing sleeve 2 . When the position sensor in a certain direction detects that the suspension seat is approaching, it actively controls the driving source such as the motor, and controls the slider to move in the same direction as the air bearing shaft through various conventional methods such as ball screws, timing belts, belts or wire ropes. Thereby it is ensured that the suspension seat 4 is located in the middle position between the two air bearing sleeves. For the occasion of long-distance movement, firstly, the active drive mechanism drives the slider to move. Due to the frictionless motion between the air bearing sleeve and the air bearing shaft, the moving process of the slider does not affect the spatial position and position of the air bearing shaft and moving parts. Movement has an impact. Therefore, the long-distance axial frictionless movement is ingeniously grafted onto the slider guide rail assembly with general precision, so that the extremely short air bearing shaft can move with the large displacement of the moving parts. At the same time, because the air flotation device is supplied with air through the air flotation sleeve, and the moving parts are fixed on the air flotation shaft, the resistance generated by the bending of the trachea when the device moves will not be transmitted to the air flotation shaft, and thus will not have any impact on the moving parts. The effect of additional force.

Due to the powerful advantages of the microcontroller in real-time signal processing and calculation functions, it can achieve good follow-up of moving parts at a certain speed, especially suitable for low-speed workplaces.

Claims (4)

1. the extra long distance of the pipe disturbance power influence of not being bullied is followed the air-floating apparatus of suspension centre movement locus, the gentle empty boasting of air-bearing shafts, described air supporting cover is sleeved on the described air-bearing shafts, it is characterized in that: described air supporting cover comprises left air supporting cover and right air supporting cover, described left air supporting cover is sleeved on the left side of described air-bearing shafts, described right air supporting cover is sleeved on the right side of described air-bearing shafts, Holder for hanging household utensiles is installed at described air-bearing shafts middle part, described Holder for hanging household utensiles is connected with hanging rope, described hanging rope and described movement parts servo-actuated, described air-floating apparatus also comprises guide rail, and slide block is installed on the described guide rail slidably, described slide block and left air supporting cover, right air supporting cover is fixedly connected; Described slide block is connected with main tracheae, and described main tracheae is communicated with left bronchus, right bronchus, and described left bronchus is connected with described left air supporting cover, and described right bronchus is connected with described right air supporting cover.

2. extra long distance of not being bullied the influence of pipe disturbance power as claimed in claim 1 is followed the air-floating apparatus of suspension centre movement locus, it is characterized in that: described left air supporting cover, right air supporting cover be the connection seat respectively, and described fitting seat is fixedlyed connected with described slide block.

3. extra long distance of not being bullied the influence of pipe disturbance power as claimed in claim 1 or 2 is followed the air-floating apparatus of suspension centre movement locus, it is characterized in that: described air-floating apparatus also comprises in order to judging that Holder for hanging household utensiles departs from the position transducer whether left and right sides air supporting cover neutral position reaches setting value, and described position transducer is installed between Holder for hanging household utensiles overlaps with left air supporting cover, right air supporting.

4. extra long distance of not being bullied the influence of pipe disturbance power as claimed in claim 3 is followed the air-floating apparatus of suspension centre movement locus, it is characterized in that: described position transducer is Hall transducer and permanent magnet, described Hall transducer is installed in described left air supporting cover and right air supporting puts, and described permanent magnet is installed on the Holder for hanging household utensiles.

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