CN114543629A - Flexible floating device for high-precision radial positioning - Google Patents

Abstract

The invention provides a flexible floating device for high-precision radial positioning, which comprises a shell and a floating shaft, wherein the floating shaft is arranged in the shell, an upper sealing cover and a lower sealing cover are arranged at the upper end and the lower end of the shell, an upper translation assembly and a lower translation assembly are respectively sleeved at the two ends of a floating shaft step, a floating shaft middle adjusting screw and a floating shaft bottom adjusting screw are respectively arranged at the middle part and the bottom of the shell, a bottom compression spring is sleeved on the floating shaft bottom adjusting screw, the two ends of the bottom compression spring are respectively abutted against the shell and the floating shaft, a floating shaft top adjusting screw is arranged on the upper sealing cover, a top compression spring is sleeved on the floating shaft top adjusting screw, and the two ends of the top compression spring are respectively abutted against the upper sealing cover and the upper translation assembly. The invention solves the problems that the measurement device in the prior art has deviation when positioning the position of the measurement hole, so that the measurement cannot be carried out and the measurement error is large.

Description

A flexible floating device for high-precision radial positioning

technical field

The invention relates to the technical field of machining and mechanical measurement, in particular to a flexible floating device used for high-precision radial positioning.

Background technique

In the field of mechanical measurement, it is necessary to measure the hole diameter of the finished workpiece to detect whether the machining accuracy of the hole meets the industry and demand standards. The high-precision measurement method of aperture is currently generally using an electronic plug gauge as a measurement device. When measuring the aperture, put the electronic plug gauge into the hole of the workpiece. In order to achieve high-precision measurement, the diameter of the hole can only be slightly larger than that of the electronic plug gauge measuring tool, otherwise the measurement result of the aperture will be inaccurate. In order to realize the automatic measurement of the hole on the workpiece, it is necessary to install the electronic plug gauge on the automatic measuring device. Generally, the electronic plug gauge is installed on the clamping device. When measuring the aperture, the main control chip of the automation equipment controls the clamping device to The electronic plug gauge is moved into the measuring hole for measurement. How to control the accurate placement of the electronic plug gauge into the measurement hole is the key to ensuring the smooth measurement process.

During the above measurement, the measurement workpiece is rigidly positioned with the entire set of measurement devices, and the electronic plug gauge is usually rigidly connected to the clamping device of the measurement device. Since both objects are rigidly positioned, during the measurement process, the automated measurement procedures require Strictly, if there is an error in the automatic positioning of the clamping device holding the electronic plug gauge, the electronic plug gauge cannot enter the measurement hole accurately, and the most direct consequence is that the aperture measurement fails. If the sensor material used for measurement is fragile, it will be The electronic plug gauge was damaged in the rigid collision with the measurement workpiece.

When the floating device clamps the electronic plug gauge for aperture measurement, if the flexible floating device is automated, it can generate a slight floating in the radial direction. Within the allowable error range, the floating device extends the electronic plug gauge into the measuring hole, thereby making up for The positioning error of the automatic program is reduced, and the positioning accuracy is improved.

As mentioned above, a floating clamping device is designed, which can ensure that the electronic plug gauge is smoothly fed into the measuring hole within a certain error range to complete the hole measurement work, thereby improving the measurement efficiency of the entire set of automated measuring equipment. Improve the test robustness of the system and reduce the probability of damage to equipment and sensors.

SUMMARY OF THE INVENTION

The present invention provides a universal flexible measurement of hole diameter, so as to solve the problems of inability to measure and large measurement error due to deviations existing in the prior art measuring device when locating the position of the measuring hole.

In order to solve the above-mentioned technical problems, the present invention provides a flexible floating device for high-precision radial positioning, comprising a casing, an upper cover, a lower cover, and a floating shaft, the floating shaft is installed in the casing, and the casing is up and down. Both ends are installed with an upper cover and a lower cover, the floating shaft is a stepped shaft, the two ends of the floating shaft ladder are respectively sleeved with an upper translation component and a lower translation component, and the middle and bottom of the casing are respectively provided with floating The adjustment screw in the middle of the shaft and the adjustment screw at the bottom of the floating shaft, the adjustment screw in the middle of the floating shaft and the adjustment screw at the bottom of the floating shaft are arranged radially along the floating shaft and reset the position of the floating shaft in the radial direction, and the adjusting screw at the bottom of the floating shaft is sleeved A bottom compression spring is provided, and both ends of the bottom compression spring are respectively in contact with the bottom adjustment screw of the floating shaft and the floating shaft. There is a top compression spring, and the two ends of the top compression spring are respectively in contact with the top adjustment screw of the floating shaft and the upper translation component.

The floating shaft is a hollow stepped shaft, and tools such as a measuring sensor and a cutter can be installed in the hollow part of the floating shaft.

The outer casing and the upper cover are connected with the upper cover fixing screws, and the outer casing and the lower cover are connected with the lower cover fixing screws.

The floating shaft is provided with an inner thread which is threadedly matched with the adjusting screw at the middle of the floating shaft and the adjusting screw at the bottom of the floating shaft.

The adjusting screw in the middle of the floating shaft, the adjusting screw at the bottom of the floating shaft and the casing are in clearance fit.

The upper translation assembly and the lower translation assembly are plane thrust bearings, the upper cover is in contact with the upper plane of the upper translation assembly, and the lower cover is in contact with the steel ball rollers of the lower translation assembly.

The upper translation assembly, the lower translation assembly and the floating shaft are assembled with clearance fit.

A flange is arranged on the upper cover.

The beneficial effects brought by the invention: (1) the device can provide radial floating within a certain error range when the hole is positioned, so as to ensure that the clamping device can perform subsequent operations on the hole, such as hole diameter measurement; (2) through the floating shaft The small floating of the clamping device can realize the floating of the clamping device, thereby improving the robustness of the system and reducing the equipment damage and workpiece damage caused by the failure of hole positioning; (3) The floating device is limited by the translation component to limit the floating of the floating shaft. , and after the radial floating, under the action of the adjusting screw and the compression spring, it can be quickly reset.

Description of drawings

1 is a schematic diagram of the appearance structure of a flexible floating device for high-precision radial positioning according to the present invention;

2 is a cross-sectional view of a flexible floating device for high-precision radial positioning according to the present invention;

Figure 3 is a cross-sectional view of the adjustment screw along the top of the floating shaft;

4 is a top view of a flexible floating device for high-precision radial positioning according to the present invention;

Among them, 1-shell, 2-upper cover, 3-lower cover, 4-floating shaft, 5-floating shaft middle adjustment screw, 6-floating shaft bottom adjustment screw, 7-floating shaft top adjustment screw, 8-upper Translation assembly, 9-lower translation assembly, 10-bottom compression spring, 11-top compression spring, 12-upper cover fixing screw, 13-lower cover fixing screw.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

As shown in Figures 1-4, an embodiment of a flexible floating device for high-precision radial positioning provided by the present invention, referring to Figure 1, the floating device includes a casing 1, an upper cover 2, and a lower cover 3 and the floating axis 4.

Referring to FIG. 2, the floating shaft 4 is a hollow stepped shaft, and the upper and lower parts of the shaft are sleeved with an upper translation assembly 8 and a lower translation assembly 9. The upper translation assembly 8 and the lower translation assembly 9 are a kind of plane thrust bearing , can bear the axial load transmitted by the floating shaft 4, the upper translation assembly 8, the lower translation assembly 9 and the floating shaft 4 are assembled with clearance fit, and the minimum clearance is greater than zero, so as to ensure that the floating shaft 4 can be There is a floating allowance in the radial direction; the upper translation assembly 8 and the lower translation assembly 9 and the casing 1 are assembled by clearance fit, and the fitting clearance can be flexibly set according to different floating requirements. In this embodiment, the size of the fitting clearance is 1 mm, This ensures that there is a 1mm floating margin.

Referring to FIG. 3 , after the floating shaft 4 is installed in the casing 1 , the casing 1 and the upper cover 2 are connected with the upper cover fixing screws 12 , and the casing 1 and the lower cover 3 are connected with the lower cover fixing screws 13 ; The upper part of the upper cover 2 is provided with a flange, which can be connected and fixed with other flanges; the connection here is a rigid connection, which can ensure that the main body shell of the floating device and the external connection will not float.

Referring to Figures 2 and 3, the adjustment components of the floating device include: a floating shaft middle adjusting screw 5, a floating shaft bottom adjusting screw 6, a floating shaft top adjusting screw 7, a bottom compression spring 10, and a top compression spring.

The adjusting screw 5 in the middle of the floating shaft, the adjusting screw 6 at the bottom of the floating shaft, and the adjusting screw 7 at the top of the floating shaft are used to adjust and reset the floating shaft 4 slightly in the radial and axial directions of the floating shaft 4 . The compression spring is installed on the adjusting screw, and the position of the floating shaft 4 can be reset by using the elastic force of the compression spring.

In the present invention, the flange plate on the upper cover 2 is installed on other equipment, so that other components clamped on the floating device can have floating characteristics.

Referring to FIG. 2 , there are four through holes distributed at 90 degrees in the middle of the casing 1 , the corresponding position of the floating shaft 4 has four internal threaded holes distributed at 90 degrees, the middle adjustment screw 5 and the holes on the casing 1 For clearance fit, the middle adjusting screw 5 is threadedly connected with the internal threaded hole on the floating shaft 4, and the connection is a rigid connection; there are four threaded holes distributed at 90 degrees below the casing 1, and the corresponding position of the floating shaft 4 , there are four through holes distributed at 90 degrees, the adjusting screw 6 at the bottom of the floating shaft is threaded with the hole on the housing 1, the adjusting screw 6 at the bottom of the floating shaft and the through hole on the floating shaft 4 are clearance fit, the above-mentioned multiple The adjustment screw is used for auxiliary positioning and limiting of the floating shaft 4 in the axial and radial directions. A compression spring 10 is sleeved on the bolt rod of the adjusting screw 6 at the bottom of the floating shaft. Shaft 4 returns to the pivot position of the floating device, which is the nominal position at which the device is positioned.

The adjustment screw 5 in the middle of the floating shaft, the adjustment screw 6 at the bottom of the floating shaft, the upper translation assembly 8 and the lower translation assembly 9 jointly perform the floating limit and the nominal position reset of the floating shaft 4 in the radial direction. The upper translation assembly 8 and the lower translation assembly 9 fix the floating shaft 4 in the axial direction, while the upper translation assembly 8 and the lower translation assembly 9 and the floating shaft 4 belong to clearance fit, which can ensure that the floating shaft 4 can be floated in the radial direction, with A certain radial allowance.

Referring to FIG. 3, the floating shaft top adjustment screw 7 is installed on the upper cover 2, and the upper cover 2 has three threaded holes distributed at 120 degrees. 7 After installation, the lower part is covered with a top compression spring 11, and the bottom of the top compression spring 11 is in contact with the upper translation assembly 8, which can provide pressure in the axial direction on the one hand, and tangential force in the axial direction on the other hand, which can After the floating amount of the device is eliminated, restore the translation component to the nominal position along the axis rotation direction;

Referring to FIG. 1, other devices such as measuring sensors, tools, etc. can be installed on the floating shaft 4. The selected devices and applicable scenarios can be applied in the case where a certain amount of radial floating is allowed. In the above scenario, if there is no radial The floating amount will be on the contacting workpiece or the contact plane between the floating shaft 4 and the contact surface. When the positioning range is exceeded, a rigid contact will occur directly on the contact surface, thereby destroying the shaft or the workpiece, thereby affecting the subsequent processing and production processes.

In an embodiment of aperture measurement, an electronic plug gauge suitable for high-precision aperture measurement is installed in the hollow part of the floating shaft 4, the hole to be measured is located on the workpiece, and the measurement hole on the workpiece has a chamfer. When the device controls the floating shaft 4 to carry the electronic plug gauge into the measuring hole, if there is a slight error in the positioning of the automatic measuring device, the edge of the floating shaft 4 will exceed the outer edge of the measuring hole. Measure the chamfer of the hole. At this time, on the contact surface, the floating shaft will be subjected to radial force. Under the action of the force, the floating shaft will generate a floating displacement in the radial direction on the floating device, so that the plug gauge can be extended. In this embodiment, the floating device ensures the success rate of the operation and improves the robustness of the system.

To sum up, the flexible floating device for high-precision radial positioning of the present invention, (1) the device can provide radial floating within a certain error range during hole positioning, so as to ensure that the clamping device can perform follow-up on the hole. operations, such as hole diameter measurement; (2) the floating of the clamping device can be achieved through the small floating of the floating shaft, thereby improving the robustness of the system and reducing equipment damage and workpiece damage caused by hole positioning failure; (3) the floating The device uses a translation component to limit the floating of the floating shaft, and after radial floating, it can be quickly reset under the action of the adjusting screw and the compression spring.

The above descriptions are merely embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (8)

1. A flexible floatation device for high precision radial positioning, characterized by: the floating shaft is characterized by comprising a shell (1), an upper sealing cover (2), a lower sealing cover (3) and a floating shaft (4), wherein the floating shaft (4) is installed in the shell (1), the upper sealing cover (2) and the lower sealing cover (3) are installed at the upper end and the lower end of the shell (1), the floating shaft (4) is a stepped shaft, an upper translation assembly (8) and a lower translation assembly (9) are respectively sleeved at the two ends of the step of the floating shaft (4), floating shaft middle adjusting screws (5) and floating shaft bottom adjusting screws (6) are respectively arranged at the middle part and the bottom of the shell (1), the floating shaft middle adjusting screws (5) and the floating shaft bottom adjusting screws (6) are radially arranged along the floating shaft (4) and radially limit and reset the floating shaft (4), a bottom compression spring (10) is sleeved on the floating shaft bottom adjusting screws (6), and two ends of the bottom compression spring (10) are respectively connected with the shell (1), The floating shaft (4) is abutted, a floating shaft top adjusting screw (7) is installed on the upper sealing cover (2), a top compression spring (11) is sleeved on the floating shaft top adjusting screw (7), and two ends of the top compression spring (11) are respectively abutted to the upper sealing cover (2) and the upper translation assembly (8).

2. The flexible floating device for high-precision radial positioning according to claim 1, characterized in that the floating shaft (4) is a hollow stepped shaft, and a measuring sensor, a tool such as a cutter and the like can be installed in the hollow part of the floating shaft (4).

3. Flexible floating device for high precision radial positioning according to claim 1, characterized in that the housing (1) is connected to the upper cover (2) by means of upper cover fixing screws (12) and the housing (1) is connected to the lower cover (3) by means of lower cover fixing screws (13).

4. The flexible floating device for high-precision radial positioning according to claim 1, wherein the floating shaft (4) is provided with internal threads in threaded fit with the floating shaft middle adjusting screw (5), and the floating shaft (4) is in clearance fit with the floating shaft bottom adjusting screw (6).

5. The flexible floating device for high-precision radial positioning according to claim 4, characterized in that the outer shell (1) is in clearance fit with the floating shaft middle adjusting screw (5), and the outer shell (1) is in threaded fit connection with the floating shaft bottom adjusting screw (6).

6. The flexible floating device for high precision radial positioning according to claim 1, characterized in that the upper and lower translating elements (8, 9) are plane thrust bearings, the upper cover (2) is in contact with the upper plane of the upper translating element (8), and the lower cover (3) is in contact with the lower translating element (9) by means of steel ball rollers.

7. The flexible floating device for high precision radial positioning according to claim 1, characterized in that the upper and lower translating assemblies (8, 9) and the floating shaft (4) are clearance fit assembled.

8. Flexible floating device for high precision radial positioning according to claim 1, characterised in that said upper cover (2) is provided with a flange.

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