A flexible floating device for high-precision radial positioning

Abstract

The present invention provides a flexible floating device for high-precision radial positioning, which includes a housing and a floating shaft. The floating shaft is installed in the housing. Upper and lower covers are installed at the upper and lower ends of the housing respectively. Upper and lower translation components are sleeved at the two ends of the stepped floating shaft respectively. A floating shaft middle adjustment screw and a floating shaft bottom adjustment screw are respectively arranged in the middle and at the bottom of the housing. A bottom compression spring is sleeved on the floating shaft bottom adjustment screw, and the two ends of the bottom compression spring are respectively abutted against the housing and the floating shaft. A floating shaft top adjustment screw is installed on the upper cover, and a top compression spring is sleeved on the floating shaft top adjustment screw. The two ends of the top compression spring are respectively abutted against the upper cover and the upper translation component. By means of the present invention, the problems in the prior art that there are deviations when the measuring device positions and measures the position of the measuring hole, resulting in inability to measure and large measurement errors, can be solved.

Description

Technical Field

[0001] The present invention relates to the technical fields of machining and mechanical measurement, and particularly to a flexible floating device for high-precision radial positioning. Background Art

[0002] In the field of mechanical measurement, it is necessary to measure the aperture of a machined workpiece to detect whether the machining accuracy of the hole meets industrial and requirement standards. The current common method for high-precision measurement of the aperture is to use an electronic plug gauge as the measuring device. When measuring the aperture, the electronic plug gauge is placed into the hole of the workpiece. In order to achieve high-precision measurement, the diameter of the hole can only be slightly larger than the measuring tool of the electronic plug gauge; otherwise, the measurement result of the aperture will be inaccurate. In order to realize the automatic measurement of the holes on the workpiece, the electronic plug gauge needs to be installed on an automatic measuring device. Generally, the electronic plug gauge is installed on a clamping device. When measuring the aperture, the main control chip of the automatic equipment controls the clamping device to move the electronic plug gauge into the measuring hole for measurement. How to control the accurate placement of the electronic plug gauge into the measuring hole is the key to ensuring the smooth progress of the measurement process.

[0003] During the above measurement, the measured workpiece and the entire set of measuring devices are rigidly positioned, and the electronic plug gauge is usually also rigidly connected to the clamping device of the measuring device. Since both objects are rigidly positioned, during the measurement process, strict requirements are imposed on the automatic measurement program. If there is an error in the automatic positioning of the clamping device that holds the electronic plug gauge, the electronic plug gauge cannot accurately enter the measuring hole. The most direct consequence is the failure of the aperture measurement. If the sensor material used for measurement is fragile, it will be damaged during the rigid collision between the electronic plug gauge and the measured workpiece.

[0004] When a floating device clamps the electronic plug gauge for aperture measurement, if the flexible floating device can be automated to generate a slight float in the radial direction, within the allowable error range, the floating device will extend the electronic plug gauge into the measuring hole, thereby compensating for the positioning error of the automatic program and improving the positioning accuracy rate.

[0005] As described above, design a floating clamping device that can ensure that the electronic plug gauge is smoothly sent 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 automatic measuring equipment, enhancing the test robustness of the system, and reducing the damage probability of the equipment and sensors. Summary of the Invention

[0006] The present invention provides a general flexible measurement of hole diameter to solve the problems in the prior art that the measuring device has deviations when positioning the measuring hole position, resulting in inability to measure and large measurement errors.

[0007] To solve the above technical problems, the present invention provides a flexible floating device for high-precision radial positioning, which includes a housing, an upper cover, a lower cover, and a floating shaft. The floating shaft is installed in the housing, and the upper cover and the lower cover are installed at the upper and lower ends of the housing respectively. The floating shaft is a stepped shaft, and upper and lower translation components are sleeved at both ends of the stepped part of the floating shaft respectively. A floating shaft middle adjustment screw and a floating shaft bottom adjustment screw are respectively arranged in the middle and at the bottom of the housing. The floating shaft middle adjustment screw and the floating shaft bottom adjustment screw are arranged along the radial direction of the floating shaft and limit and reset the floating shaft in the radial direction. A bottom compression spring is sleeved on the floating shaft bottom adjustment screw, and both ends of the bottom compression spring are respectively in contact with the floating shaft bottom adjustment screw and the floating shaft. A floating shaft top adjustment screw is installed on the upper cover, and a top compression spring is sleeved on the floating shaft top adjustment screw. Both ends of the top compression spring are respectively in contact with the floating shaft top adjustment screw and the upper translation component.

[0008] The floating shaft is a hollow stepped shaft, and measuring sensors, tools such as cutters, etc. can be installed in the hollow part of the floating shaft.

[0009] The housing and the upper cover are connected by upper cover fixing screws, and the housing and the lower cover are connected by lower cover fixing screws.

[0010] Internal threads that are in threaded cooperation with the floating shaft middle adjustment screw and the floating shaft bottom adjustment screw are provided on the floating shaft.

[0011] A clearance fit is provided between the floating shaft middle adjustment screw, the floating shaft bottom adjustment screw and the housing.

[0012] The upper and lower translation components are planar thrust bearings. The upper cover is in contact with the upper plane of the upper translation component, and the lower cover is in contact with the steel ball rollers of the lower translation component.

[0013] A clearance fit assembly is provided between the upper and lower translation components and the floating shaft.

[0014] A flange is provided on the upper cover.

[0015] The beneficial effects brought by the present invention are as follows: (1) When the device is used for hole positioning, it can provide radial floating within a certain error range, ensuring that the clamping device can perform subsequent operations on the hole, such as hole diameter measurement; (2) The floating of the clamping device can be realized through the slight floating of the floating shaft, thereby improving the robustness of the system and reducing equipment damage and workpiece damage caused by failed hole positioning; (3) The floating of the floating shaft is limited by the translation component in this floating device, and after radial floating, it can be quickly reset under the action of the adjustment screw and the compression spring. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the external structure of a flexible floating device for high-precision radial positioning according to the present invention;

[0017] Figure 2 is a cross-sectional view of a flexible floating device for high-precision radial positioning according to the present invention;

[0018] Figure 3 is a cross-sectional view along the adjusting screw at the top of the floating shaft;

[0019] Figure 4 is a top view of a flexible floating device for high-precision radial positioning according to the present invention;

[0020] Wherein, 1 - housing, 2 - upper cover, 3 - lower cover, 4 - floating shaft, 5 - adjusting screw in the middle of the floating shaft, 6 - adjusting screw at the bottom of the floating shaft, 7 - adjusting screw at the top of the floating shaft, 8 - upper translation assembly, 9 - lower translation assembly, 10 - bottom compression spring, 11 - top compression spring, 12 - fixing screw for the upper cover, 13 - fixing screw for the lower cover. Detailed implementation manners

[0021] 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.

[0022] As Figures 1-4 shown, an embodiment of a flexible floating device for high-precision radial positioning provided by the present invention is referred to the attached Figure 1 , the floating device includes a housing 1, an upper cover 2, a lower cover 3 and a floating shaft 4.

[0023] Referring to the attached Figure 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 planar thrust bearing, which can bear the axial load transmitted by the floating shaft 4. When the upper translation assembly 8 and the lower translation assembly 9 are assembled with the floating shaft 4, a clearance fit is adopted, and the minimum clearance is greater than zero, so as to ensure that the floating shaft 4 has a floating margin in the radial direction; the upper translation assembly 8 and the lower translation assembly 9 are assembled with the housing 1 by a clearance fit, and the fit clearance can be flexibly set according to different floating requirements. In this embodiment, the fit clearance is 1 mm, so that a floating margin of 1 mm can be ensured.

[0024] Referring to the attached Figure 3After the floating shaft 4 is installed in the housing 1, the housing 1 and the upper cover 2 are connected using the upper cover fixing screws 12, and the housing 1 and the lower cover 3 are connected using the lower cover fixing screws 13; a flange is provided on the upper part of the upper cover 2, which can be connected and fixed to other flanges; the connection here is a rigid connection, so as to ensure that the main housing of this floating device will not float when connected to the outside.

[0025] Reference appendix Figure 2 and appendix Figure 3 , the adjustment components of the floating device include: the middle adjustment screw 5 of the floating shaft, the bottom adjustment screw 6 of the floating shaft, the top adjustment screw 7 of the floating shaft, the bottom compression spring 10, and the top compression spring.

[0026] The middle adjustment screw 5 of the floating shaft, the bottom adjustment screw 6 of the floating shaft, and the top adjustment screw 7 of the floating shaft are used to make minute adjustments and resets to the floating shaft 4 in the radial and axial rotation directions of the floating shaft 4. The compression springs are installed on the adjustment screws, and the elastic force of the compression springs can be used to reset the position of the floating shaft 4.

[0027] The present invention is installed on other devices through the flange on the upper cover 2, so that other components clamped on this floating device can have floating characteristics.

[0028] Reference appendix Figure 2 , there are four through holes distributed at 90 degrees in the middle of the housing 1. At the corresponding positions of the floating shaft 4, there are four internal threaded holes distributed at 90 degrees. The middle adjustment screw 5 and the holes on the housing 1 are in clearance fit, and the middle adjustment screw 5 is threadedly connected to the internal threaded holes on the floating shaft 4. This connection is a rigid connection; there are four threaded holes distributed at 90 degrees under the housing 1. At the corresponding positions of the floating shaft 4, there are four through holes distributed at 90 degrees. The bottom adjustment screw 6 of the floating shaft is threadedly connected to the holes on the housing 1, and the bottom adjustment screw 6 of the floating shaft and the through holes on the floating shaft 4 are in clearance fit. The above-mentioned multiple adjustment screws perform auxiliary positioning and limiting on the floating shaft 4 in the axial and radial directions. A compression spring 10 is sleeved on the bolt rod of the bottom adjustment screw 6 of the floating shaft. The function of the compression spring 10 is that when the floating shaft floats and deviates in the radial direction, under the action of the spring elastic force, the floating shaft 4 can return to the axis position of the floating device, and the axis position is the nominal position for the positioning of this device.

[0029] The middle adjustment screw 5 of the floating shaft, the bottom adjustment screw 6 of the floating shaft, the upper translation assembly 8, and the lower translation assembly 9 jointly perform floating limit and nominal position reset on 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. At the same time, the upper translation assembly 8 and the lower translation assembly 9 and the floating shaft 4 are in clearance fit, which can ensure that the floating shaft 4 can float in the radial direction and has a certain radial allowance.

[0030] Reference appendix Figure 3 , the top adjustment screw 7 of the floating shaft is installed on the upper cover 2. There are 3 threaded holes on the upper cover 2 distributed at 120 degrees. The lower part of the threaded hole has no thread. After the top adjustment screw 7 of the floating shaft is installed, the lower part is sleeved with a top compression spring 11. The bottom of the top compression spring 11 contacts the upper translation assembly 8, providing axial pressure on the one hand and tangential force in the axial rotation direction on the other hand. After eliminating the floating amount of the device, the translation assembly can be restored to the nominal position in the axial rotation direction;

[0031] Reference appendix Figure 1 , other devices such as measurement sensors and cutting tools can be installed on the floating shaft 4. The selected device and applicable scenario can be applied when there is a certain radial floating amount allowed. In the above scenario, if there is no radial floating amount, when the floating shaft 4 contacts the workpiece or the contact plane and exceeds the positioning range, rigid contact will directly occur on the contact surface, thus damaging the shaft or the workpiece and affecting the subsequent processing and production process.

[0032] 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 automated measurement device controls the floating shaft 4 to carry the electronic plug gauge into the measurement hole, if there is a slight error in the positioning of the automated measurement device, the edge of the floating shaft 4 will exceed the outer edge of the measurement hole. During the downward extension of the floating shaft, the floating shaft contacts the chamfer of the measurement hole. At this time, on the contact surface, the floating shaft will receive a radial force. Under the action of the force, the floating shaft will generate a radial floating displacement on the floating device, so that the plug gauge can be inserted into the measurement hole, and the measurement element and the workpiece will not be damaged due to rigid collision on the contact surface. In this embodiment, the floating device ensures the success rate of this operation and improves the robustness of the system.

[0033] In summary, 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, ensuring that the clamping device can perform subsequent operations on the hole, such as aperture measurement; (2) The floating of the clamping device can be achieved through the slight floating of the floating shaft, thereby improving the robustness of the system and reducing equipment damage and workpiece damage caused by failed hole positioning; (3) The floating of the floating shaft is limited by the translation assembly of the floating device, and after radial floating, it can be quickly reset under the action of the adjustment screw and the compression spring.

[0034] The above are only 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 variations. 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

1. A flexible floating device for high-precision radial positioning, characterized in that: It includes a housing (1), an upper cover (2), a lower cover (3), and a floating shaft (4). The floating shaft (4) is installed in the housing (1). The upper cover (2) and the lower cover (3) are installed at the upper and lower ends of the housing (1). The floating shaft (4) is a stepped shaft. Upper translation components (8) and lower translation components (9) are respectively sleeved at both ends of the step of the floating shaft (4). A floating shaft middle adjustment screw (5) and a floating shaft bottom adjustment screw (6) are respectively arranged in the middle and at the bottom of the housing (1). The floating shaft middle adjustment screw (5) and the floating shaft bottom adjustment screw (6) are arranged along the radial direction of the floating shaft (4) and limit and reset the floating shaft (4) in the radial direction. A bottom compression spring (10) is sleeved on the floating shaft bottom adjustment screw (6). Both ends of the bottom compression spring (10) are respectively abutted against the housing (1) and the floating shaft (4). A floating shaft top adjustment screw (7) is installed on the upper cover (2). A top compression spring (11) is sleeved on the floating shaft top adjustment screw (7). Both ends of the top compression spring (11) are respectively abutted against the upper cover (2) and the upper translation component (8). The floating shaft (4) is a hollow stepped shaft, and a measurement sensor and a tool are installed in the hollow part of the floating shaft (4). Internal threads that are in threaded cooperation with the floating shaft middle adjustment screw (5) are provided on the floating shaft (4), and the floating shaft (4) is in clearance fit with the floating shaft bottom adjustment screw (6). The housing (1) is in clearance fit with the floating shaft middle adjustment screw (5), and the housing (1) is in threaded connection with the floating shaft bottom adjustment screw (6). The upper translation components (8) and the lower translation components (9) are planar thrust bearings. The upper cover (2) is in contact with the upper plane of the upper translation component (8), and the lower cover (3) is in contact with the steel ball rollers of the lower translation component (9).

2. The flexible floating device for high-precision radial positioning according to claim 1, wherein, The housing (1) and the upper cover (2) are connected by upper cover fixing screws (12), and the housing (1) and the lower cover (3) are connected by lower cover fixing screws (13).

3. The flexible floating device for high-precision radial positioning according to claim 1, characterized in that A clearance fit assembly is provided between the upper translation components (8), the lower translation components (9) and the floating shaft (4).

4. The flexible floating device for high-precision radial positioning according to claim 1, wherein A flange is provided on the upper cover (2).

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