A quick detection method for the center line of shaft parts

Abstract

The present invention discloses a method for rapid detection of the center line of shaft parts. The roller support assembly of the device includes two groups of positioning mechanisms and a connecting plate. The positioning mechanism is composed of rollers arranged at both ends of the connecting shaft. The two groups of positioning mechanisms are coaxially arranged and spaced apart. The two ends of the connecting plate are respectively connected to the connecting shafts of the two groups of positioning mechanisms. The guide rail is arranged on the top surface of the connecting plate. The target ball is arranged at the center of the connecting shaft or on the guide rail and moves along the guide rail. The method places the roller support assembly on the roller surface of the shaft part to be measured, and the two rollers of the positioning mechanism automatically find the center on the roller surface; a laser tracker or a total station is used to collect the position information of the characteristic points of the target ball to obtain the parallel line of the axis center; the parallelism and verticality spatial positions of the shaft parts are related to detection and evaluation; the target ball moves along the guide rail, the characteristic point information of the target ball is collected to obtain the roller surface curve of the shaft part, and the roller shape of the shaft part is evaluated. The device and method can realize rapid positioning and detection of the center line of the shaft part.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a device and a detection method for quickly locating the center line of a shaft part. Background Art

[0002] When using optical equipment such as laser trackers and total stations to detect the centerline of shaft parts, due to the detection characteristics of optical equipment such as laser trackers and total stations, the shaft parts need to be visible for more than 180° or rotatable for more than 180°. However, in many equipment maintenance and inspection processes, due to many equipment factors, the inspection conditions such as visibility and rotation cannot be met at all. In order to create the optical visual inspection requirements of laser trackers and total stations, the inspection and maintenance time, inspection difficulty and maintenance cost are usually increased for the inspection, inspection and adjustment of shaft equipment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device and a method for quickly locating the center line of shaft parts. The device and method avoid the viewing angle and rotation requirements of conventional optical equipment for positioning and detecting the center line of shaft parts, and realize high-precision and rapid positioning and detection of the center line of shaft parts by optical equipment such as laser trackers, thereby improving the efficiency of equipment detection and maintenance and reducing the cost of equipment detection and maintenance.

[0004] In order to solve the above technical problems, the device for quickly positioning the center line of shaft parts of the present invention includes a roller support assembly, a guide rail and a target ball, the roller support assembly includes two groups of positioning mechanisms and a connecting plate, the positioning mechanism includes two rollers and a connecting shaft, the two rollers are respectively arranged at both ends of the connecting shaft, a mounting hole is opened in the center of the connecting shaft, the two groups of positioning mechanisms are coaxially arranged at intervals, the two ends of the connecting plate are respectively connected to the connecting shafts of the two groups of positioning mechanisms, the guide rail is arranged on the top surface of the connecting plate, and the target ball is arranged at the mounting hole in the center of the connecting shaft or on the guide rail and moves along the guide rail.

[0005] Furthermore, a long groove is opened on the bottom surface of the guide rail slide groove along the length direction, and an extension rod is provided on the bottom surface of the target ball. When the target ball moves along the guide rail, the extension rod extends out of the long groove on the bottom surface of the guide rail slide groove and the bottom end of the extension rod abuts against the roller surface of the shaft part.

[0006] Furthermore, the bottom end of the extension rod is a spherical end surface.

[0007] A method for quickly detecting the center line of a shaft part using the above-mentioned rapid positioning device comprises the following steps:

[0008] Step 1: Place the roller support assembly on the roller surface of the shaft part to be measured. The two sets of positioning mechanisms are respectively located at both ends of the roller surface of the shaft part to be measured. The two rollers of the positioning mechanism automatically find the center on the roller surface.

[0009] Step 2: Use a laser tracker or a total station to collect the position information of the target ball feature points located at the center mounting holes of the connecting shafts of the two sets of positioning mechanisms. The line connecting the two target ball feature points is the axis parallel line parallel to the axis center line of the shaft parts and at a distance of L;

[0010] Step 3: Conduct relevant inspection and evaluation on the parallelism and verticality spatial position of shaft parts based on the parallel line of the axis center;

[0011] Step 4: Move the target ball with an extension rod along the guide rail, and place the bottom end of the extension rod against the roller surface of the shaft part. Use a laser tracker or total station to collect the characteristic point information of the target ball, obtain the roller surface curve of the shaft part, and evaluate the roller shape of the shaft part.

[0012] Furthermore, the distance L between the axis parallel line and the axis center line of the shaft part is the sum of the radius of the shaft part and the distance from the characteristic point of the target sphere to the roller surface.

[0013] Furthermore, the height of the roller surface curve of the shaft part along the axial direction is H=H ， -h,

[0014] Among them, H ， is the actual measured height of the target ball feature point, and h is the distance from the target ball feature point to the bottom end of the extension rod.

[0015] Furthermore, the distance from the characteristic point of the target ball to the bottom end of the extension rod is calibrated in a laboratory.

[0016] Since the device and detection method for quickly locating the center line of shaft parts of the present invention adopt the above-mentioned technical scheme, that is, the roller support assembly of the device includes two groups of positioning mechanisms and a connecting plate, the positioning mechanism is composed of rollers arranged at both ends of the connecting shaft, a mounting hole is opened in the center of the connecting shaft, the two groups of positioning mechanisms are coaxially arranged at intervals, the two ends of the connecting plate are respectively connected to the connecting shafts of the two groups of positioning mechanisms, the guide rail is arranged on the top surface of the connecting plate, and the target ball is arranged at the mounting hole in the center of the connecting shaft or is arranged on the guide rail and moves along the guide rail. This method places the roller support assembly on the roller surface of the shaft part to be tested, and the two rollers of the positioning mechanism automatically find the center on the roller surface; a laser tracker or a total station is used to collect the position information of the target ball feature points, and the line connecting the two target ball feature points is the axis parallel line parallel to the axis center line of the shaft part; the parallelism and verticality spatial position of the shaft part are tested and evaluated based on the axis parallel line; the target ball with an extension rod is moved along the guide rail, and the bottom end of the extension rod is against the roller surface of the shaft part, and the target ball feature point information is collected to obtain the roller surface curve of the shaft part, and the roller shape of the shaft part is evaluated. This device and method avoid the viewing angle and rotation requirements of conventional optical equipment for the positioning and detection of the axis center line of the shaft part, and realize the high-precision and rapid positioning and detection of the axis center line of the shaft part by optical equipment such as laser trackers, improve the efficiency of equipment detection and maintenance, and reduce the cost of equipment detection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the structure of the device for quickly positioning the center line of a shaft part of the present invention;

[0019] Figure 2 It is a schematic diagram of the positioning mechanism in this device;

[0020] Figure 3 This is a schematic diagram of the target ball structure with an extension rod in the device;

[0021] Figure 4 This is a schematic diagram of the device being installed on the roller surface of the shaft part being measured. DETAILED DESCRIPTION

[0022] Implementation example Figure 1 and Figure 2The device for quickly positioning the center line of shaft parts of the present invention includes a roller support assembly 1, a guide rail 2 and a target ball 3. The roller support assembly 1 includes two groups of positioning mechanisms 11 and a connecting plate 12. The positioning mechanism 11 includes two rollers 13 and a connecting shaft 14. The two rollers 13 are respectively arranged at both ends of the connecting shaft 14. A mounting hole 15 is provided in the center of the connecting shaft 14. The two groups of positioning mechanisms 11 are coaxially arranged at intervals. The two ends of the connecting plate 12 are respectively connected to the connecting shafts 14 of the two groups of positioning mechanisms 11. The guide rail 2 is provided on the top surface of the connecting plate 12. The target ball 3 is provided at the mounting hole 15 in the center of the connecting shaft 14 or is provided on the guide rail 2 and moves along the guide rail 2.

[0023] Preferably, Figure 3 As shown, a long groove is opened on the bottom surface of the slide groove of the guide rail 2 along the length direction, and an extension rod 31 is provided on the bottom surface of the target ball 3. When the target ball 3 moves along the guide rail 2, the extension rod 31 extends out of the long groove on the bottom surface of the slide groove of the guide rail 2 and the bottom end of the extension rod 31 abuts against the roller surface of the shaft part.

[0024] Preferably, the bottom end of the extension rod 31 is a spherical end surface.

[0025] A method for quickly detecting the center line of a shaft part using the above-mentioned rapid positioning device comprises the following steps:

[0026] Step 1: Figure 4 As shown, the roller support assembly 1 is placed on the roller surface of the shaft part 4 to be measured, and the two sets of positioning mechanisms 11 are respectively located at both ends of the roller surface of the shaft part 4 to be measured, and the two rollers 13 of the positioning mechanism 11 automatically find the center on the roller surface;

[0027] Step 2: Use a laser tracker or a total station to collect the position information of the target ball feature points located at the center mounting holes of the connecting shafts of the two sets of positioning mechanisms. The line connecting the two target ball feature points is the axis parallel line parallel to the axis center line of the shaft parts and at a distance of L;

[0028] Step 3: Conduct relevant inspection and evaluation on the parallelism and verticality spatial position of shaft parts based on the parallel line of the axis center;

[0029] Parallelism refers to the parallelism of the center line of shaft parts and other shaft parts. The axis collected by this detection method can be used as the axis of the detection object or the reference axis. Perpendicularity refers to the perpendicularity of the center line of shaft parts and the center line of the production line. In industrial production, shaft parts are mostly placed parallel to the direction of the industrial production line. The perpendicularity of the axis of shaft parts and the direction of the production line is also one of the important indicators to measure the equipment installation requirements.

[0030] Step 4: Move the target ball with an extension rod along the guide rail, and place the bottom end of the extension rod against the roller surface of the shaft part. Use a laser tracker or total station to collect the characteristic point information of the target ball, obtain the roller surface curve of the shaft part, and evaluate the roller shape of the shaft part.

[0031] Preferably, the distance L between the axis parallel line and the axis center line of the shaft part is the sum of the radius R of the shaft part and the distance from the characteristic point of the target sphere to the roller surface.

[0032] Preferably, the height of the roller surface curve of the shaft part along the axial direction is H=H ， -h,

[0033] Among them, H ， is the actual measured height of the target ball feature point, and h is the distance from the target ball feature point to the bottom end of the extension rod.

[0034] Preferably, the distance from the characteristic point of the target sphere to the bottom end of the extension rod is calibrated in a laboratory.

[0035] The device and method are applied to the rapid positioning and detection of the axis center line of shaft parts by optical equipment such as laser trackers or total stations. When the two sets of positioning mechanisms of the roller support assembly are placed on the roller surface of the shaft parts, the two rollers of the positioning mechanism automatically find the center on the roller surface. A target ball is provided at the center of the connecting shaft between the two rollers to meet the information collection of the characteristic points of the target ball during the detection process of the laser tracker or total station. The guide rail is arranged on the connecting plate between the two sets of positioning mechanisms. The length of the guide rail can be selected and processed according to the length of the roller body of the shaft parts. The guide rail is provided with a slide groove along the length direction, and an open long groove is provided on the bottom surface of the slide groove. The target ball can move along the slide groove of the guide rail. The extension rod arranged on the bottom surface of the target ball can pass through the open long groove of the slide groove and the bottom end of the extension rod is in direct contact with the surface of the roller body, and the target ball moves along the guide rail slide groove on the roller body generatrix of the shaft parts to be inspected and collects data. The target ball is a data collection point for cooperation with the laser tracker or total station. It can be placed at the center of the connecting shaft between the two rollers of the positioning mechanism to realize the center point and axis center positioning detection. It can also walk along the slide groove of the guide rail to measure the axial roller body generatrix height and straightness of shaft parts.

[0036] In engineering surveying, when using a laser tracker or total station to detect the center line of shaft parts, there are usually two purposes. One is to only measure the center axis reference of the shaft parts, in order to detect and evaluate the straightness, parallelism and verticality of other inspection objects; the second is to detect the center line, diameter, roll shape and other parameters related to the center axis of the shaft parts.

[0037] Commonly used laser trackers or total stations detect shaft parts by collecting surface information of shaft parts or rotating shaft parts to collect circumferential information of shaft parts, and then fitting the center of the cylinder and the circumference to obtain the center line of the shaft parts. First of all, this conventional center detection of shaft parts requires that the roller surface of the test object is visible for at least 180 degrees, and it must be a typical cylindrical roller. If the surface generatrix of the shaft part is a curved shaft part, the direct collection method requires rotating the shaft part, and the rotation of shaft parts has high requirements for maintenance. Some shaft parts cannot be rotated at all, or the rotation angle cannot meet the detection requirements.

[0038] The device and method overcome the defects of conventional shaft centerline detection methods for shaft parts, and can directly detect the roller body center, roller diameter and roller shape on shaft parts, thereby improving the accuracy and efficiency of part spatial position detection, reducing equipment maintenance workload, reducing detection costs, and avoiding safety hazards in detection operations.

Claims

1. A method for quickly detecting the center line of an axis of an axis part, wherein the quick positioning device adopted comprises a roller support assembly, a guide rail and a target ball, the roller support assembly comprises two groups of positioning mechanisms and a connecting plate, the positioning mechanism comprises two rollers and a connecting shaft, the two rollers are respectively arranged at two ends of the connecting shaft, a mounting hole is provided in the center of the connecting shaft, the two groups of positioning mechanisms are coaxially arranged at intervals, the two ends of the connecting plate are respectively connected to the connecting shafts of the two groups of positioning mechanisms, the guide rail is provided on the top surface of the connecting plate, the target ball is provided at the mounting hole in the center of the connecting shaft or is provided on the guide rail and moves along the guide rail, the bottom surface of the guide rail slide groove has a long groove along the length direction, the bottom surface of the target ball is provided with an extension rod, when the target ball moves along the guide rail, the extension rod extends out of the long groove on the bottom surface of the guide rail slide groove and the bottom end of the extension rod abuts against the roller surface of the axis part, characterized in that This method comprises the following steps: Step 1: Place the roller support assembly on the roller surface of the shaft part to be measured. The two sets of positioning mechanisms are respectively located at both ends of the roller surface of the shaft part to be measured. The two rollers of the positioning mechanism automatically find the center on the roller surface. Step 2: Use a laser tracker or a total station to collect the position information of the target ball feature points located at the center mounting holes of the connecting shafts of the two sets of positioning mechanisms. The line connecting the two target ball feature points is the axis parallel line parallel to the axis center line of the shaft parts and at a distance of L; Step 3: Conduct relevant inspection and evaluation on the parallelism and verticality spatial position of shaft parts based on the parallel line of the axis center; Step 4: Move the target ball with the extension rod along the guide rail, and the bottom end of the extension rod is against the roller surface of the shaft part. Use a laser tracker or a total station to collect the characteristic point information of the target ball to obtain the roller surface curve of the shaft part. The height of the roller surface curve of the shaft part along the axial direction is H=H ， -h, Among them, H ， is the actual measured height of the target ball feature point, and h is the distance from the target ball feature point to the bottom end of the extension rod; Evaluate the roll profile of shaft parts.

2. The method for rapid detection of the center line of shaft parts according to claim 1 is characterized in that: The distance L between the axis parallel line and the axis center line of the shaft part is the sum of the radius of the shaft part and the distance from the characteristic point of the target ball to the roller surface.

3. The method for rapid detection of the center line of shaft parts according to claim 1 is characterized in that: The distance from the characteristic point of the target ball to the bottom end of the extension rod is calibrated in the laboratory.

4. The method for rapid detection of the center line of shaft parts according to claim 1 is characterized in that: The bottom end of the extension rod is a spherical end surface.

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