CN210893022U - Non-contact cylindricity measuring instrument - Google Patents
Non-contact cylindricity measuring instrument Download PDFInfo
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- CN210893022U CN210893022U CN201922466277.4U CN201922466277U CN210893022U CN 210893022 U CN210893022 U CN 210893022U CN 201922466277 U CN201922466277 U CN 201922466277U CN 210893022 U CN210893022 U CN 210893022U
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- cylindricity
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Abstract
The utility model belongs to the technical field of measuring equipment, and discloses a non-contact cylindricity measuring instrument, which is provided with a measuring frame consisting of linear guide rails; the guide rail sliding block is movably arranged on the linear guide rail of the measuring frame; and the laser displacement sensor is fixedly arranged on the guide rail sliding block. The device adopts laser displacement sensor as range finding sensor, need not carry out direct contact with the work piece. The device adopts the mode of measuring instrument motion to measure, has avoided the difficult problem of removing when measuring large-scale work piece. The measuring speed is accelerated, and the measurement is only needed to be carried out on three sections of the workpiece. The device is simple in structure and can adapt to measurement of workpieces with different sizes.
Description
Technical Field
The utility model belongs to the technical field of measuring equipment, especially, relate to a cylindricity appearance ware is measured to non-contact.
Background
Currently, the current state of the art commonly used in the industry is such that: the cylindricity refers to the difference between the maximum dimension and the minimum dimension of any vertical section as cylindricity, and the error of cylindricity comprises the errors of an axial section and a transverse section. The tolerance zone of cylindricity is the region between two coaxial cylindrical surfaces, and the radial distance between the two coaxial cylindrical surfaces is the tolerance value. The existing methods for measuring cylindricity include a two-point method, a three-coordinate measuring method and the like.
Two-point method: and measuring half of the maximum indication value and the minimum indication value of the indicating table during one revolution of the part in each given cross section as a cylindricity error value. Three-point method: and measuring half of the maximum indication value and the minimum indication value of the indicating table during one revolution of the part in each given cross section as a cylindricity error value. Three-coordinate measurement method: and measuring coordinate values of each measuring point of each cross section profile of the measured part on a three-coordinate measuring machine according to requirements, and calculating a cylindricity error value by using corresponding computer software.
The existing cylinder measurement methods are all measured in a mode that a workpiece to be measured is rotated and a measurement tool is fixed. The measurement of large-size workpieces is particularly inconvenient, and the measurement accuracy is influenced by the axis runout when the workpiece to be measured is rotated.
In summary, the problems of the prior art are as follows: the existing cylinder measurement method is particularly inconvenient for measuring large-size workpieces, and the measurement accuracy is influenced by the axis runout when the measured workpiece is rotated.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art exists, the utility model provides a cylindricity appearance ware is measured to non-contact.
The utility model is realized in such a way that a non-contact cylindricity measuring instrument is provided with a measuring frame consisting of linear guide rails;
the guide rail sliding block is movably arranged on the linear guide rail of the measuring frame;
and the laser displacement sensor is fixedly installed on the guide rail sliding block, and the synchronous belt is driven to move by the rotation of the No. 1 stepping motor, so that 4 laser displacement sensors are driven to move.
The measuring frame is arranged on a slide block of a linear guide rail of the bracket, and the synchronous belt is driven by the No. 2 stepping motor to move the measuring frame.
Furthermore, a workpiece to be measured is placed in the frame of the measuring frame.
Furthermore, a first measuring point, a second measuring point and a third measuring point which are different in position are arranged on the measuring frame.
In summary, the advantages and positive effects of the invention are: (1) the device adopts laser displacement sensor as range finding sensor, need not carry out direct contact with the work piece.
(2) The device adopts the mode of measuring instrument motion to measure, has avoided the difficult problem of removing when measuring large-scale work piece.
(3) The device only needs to measure at three cross-sections of work piece, can calculate the cylindricity of being surveyed the work piece, and measuring speed accelerates.
(4) When the device is used for measuring, the workpiece does not need to be ensured to have an included angle smaller than 45 degrees perpendicular to the measuring frame, so that the measuring operation is simplified.
(5) The device is simple in structure and can adapt to measurement of workpieces with different sizes.
Drawings
Fig. 1 is a schematic structural diagram of a non-contact cylindricity measuring instrument provided by an embodiment of the present invention.
FIG. 2 is a schematic view of the measuring point measuring principle of the non-contact cylindricity measuring instrument provided by the embodiment of the present invention
Fig. 3 is a schematic view of a position of a measuring point of a mobile measuring stand according to an embodiment of the present invention.
Fig. 4 is a model obtained by the measurement provided by the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a non-contact cylindricity measuring instrument according to an embodiment of the present invention.
In the figure: 1. a linear guide rail; 2. a first laser displacement sensor; 3. a guide rail slider; 4. a second laser displacement sensor; 5. a workpiece to be tested; 6. a fourth laser displacement sensor; 7. a third laser displacement sensor; 8. step motor No. 1; 9. a synchronizing wheel; 10. a synchronous belt; 11. a synchronous belt supporting wheel; 12. step motor No. 2; 13. a measurement frame support; 14. a first measurement point; 15. a second measurement point; 16. a third measurement point; 17. cutting off a normal surface; 18 a base support; 19 measuring rack.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
In view of the problems in the prior art, the present invention provides a non-contact cylindricity measuring instrument, which is described in detail below with reference to fig. 1-5.
This non-contact measurement cylindricity appearance includes: linear guide 1, first laser displacement sensor 2, guide rail slider 3, second laser displacement sensor 4, surveyed work piece 5, fourth laser displacement sensor 6, third laser displacement sensor 7, step motor 8 of No. 1, synchronizing wheel 9, hold-in range 10, hold-in range supporting wheel 11, step motor 12 of No. 2, measure a support piece 13, first measuring point 14, second measuring point 15, third measuring point 16, cut the normal 17, base support 18, measure a 19.
The workpiece 5 to be measured is placed in the frame of the measuring stand 19.
The first laser displacement sensor 2, the second laser displacement sensor 4, the fourth laser displacement sensor 6 and the third laser displacement sensor 7 are fixed on the guide rail sliding block 3 through laser sensor supports, and the guide rail sliding block 3 can move linearly on the linear guide rail 1 along the guide rail. The linear guide rail 1 is fixed on the aluminum profile to form a measuring frame 19. The four guide rail sliding blocks are connected together through a synchronous belt 10, and a synchronous wheel 9 is positioned at the lower part of the synchronous belt 10; driven by a No. 1 stepping motor 8 to do linear motion. The measuring frame 19 is connected to the guide rail sliding block through the measuring frame supporting piece 13, the guide rail sliding block 3 is installed on a linear guide rail fixed on the base support 18, and the No. 2 stepping motor 12 is connected through a synchronous belt, and the No. 2 stepping motor drives the measuring frame to move linearly.
Wherein, four rail blocks, four laser displacement sensor supports, four laser displacement sensor use the hold-in range with 1 step motor to link together, and step motor is rotatory to drive the hold-in range motion to drive laser displacement sensor linear motion.
And a measuring frame. During measurement, an enabling signal, a steering signal and a stepping pulse are sent to a stepping motor driver through a main control board through the movement of a stepping motor, and after the stepping motor driver receives the signals, the energizing sequence and the energizing speed of a stator coil of the stepping motor are controlled to rotate. Thereby drive four laser displacement sensor and carry out linear motion, record four laser displacement's data simultaneously at linear motion, carry out point cloud synthesis to the data of record, can obtain the cross-section figure of cylinder. Three sections of the cylinder are measured respectively, the three sections are connected to obtain a point cloud model, and the cylindricity of the middle part of the model is obtained, so that the cylindricity of the workpiece to be measured can be obtained.
Referring to fig. 1, the non-contact cylindricity measuring instrument comprises four laser displacement sensors, a linear guide rail, a stepping motor and a measuring frame. The four linear guide rails are arranged on the square support, and the length of the support can be adjusted according to the size of a measured workpiece. During measurement, the four laser displacement sensors are driven by the stepping motor to move along the straight line of the linear guide rail, the control panel records data of the laser displacement sensors while moving, and a graph of a measured section is synthesized according to the collected data, as shown in figure 2. And then moving the measuring frame, as shown in fig. 3, respectively measuring a first measuring point 14, a second measuring point 15 and a third measuring point 16, connecting the three planes to obtain a point cloud model, and measuring the cylindricity of the model to obtain the cylindricity of the measured cylinder.
The non-contact cylindricity measuring instrument does not need to consider the verticality of the measuring frame and the measuring piece, and can have a certain inclination. When the measuring frame and the cylinder form a certain included angle, the section of the scanning surface is an ellipse, point clouds of the three sections are linearly connected to obtain a model of the distances among a measuring point 14, a second measuring point 15 and a third measuring point 16, and a middle point of one straight line of the measuring model is processed to obtain a truncation normal surface 17; and cutting the middle position of the model perpendicular to the cylindrical surface of the model to obtain the cylindricity of the measured workpiece.
The present invention will be further described with reference to the working principle.
According to the working principle of the non-contact cylindricity measuring instrument, a laser displacement sensor measures the distance between the surface of a workpiece and a measuring frame, and a synchronous belt is driven by the rotation of a No. 1 stepping motor so as to drive the laser displacement sensor to move along a linear guide rail. The stepping motor collects data of the laser displacement sensor once every step, and the collected data of the laser displacement sensor are fused to obtain a cross-section outline point cloud of a first measuring point, as shown in fig. 2. Then, the No. 2 stepping motor rotates to drive the synchronous belt to further drive the measuring frame to move to a second measuring point, the measuring action is repeated to obtain a section contour point cloud of the second measuring point, and then the measuring frame is moved to a third measuring point to repeat the measuring action to obtain a section contour point cloud of a third measuring point. The first measurement-third measurement point spacing is a minimum of 2mm, and no equivalent spacing is required. After the first measurement point and the third measurement point are measured, point cloud connection of three sections is firstly judged whether the three points are on the same straight line or not, whether the error is larger than 0.5mm or not is judged if the error is not on the same straight line, if the error is larger than the error, the point cloud connection is abandoned, and if the error is smaller than the error, fitting is carried out. And (3) obtaining the model shown in the figure 4 after the point cloud connection of the three interfaces is finished, making a normal surface on the midpoint of one straight line of the model, cutting the model along the normal surface to obtain contour point cloud which is the accurate section of the workpiece to be measured, and calculating the cylindricity of the obtained section contour to obtain the cylindricity of the workpiece.
In the present invention, fig. 3 is a schematic diagram of the position of the measurement point of the mobile measurement stand.
Fig. 4 is a model derived from the measurements provided.
FIG. 5 is a schematic side view of the non-contact cylindricity measuring apparatus provided.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.
Claims (3)
1. The non-contact cylindricity measuring instrument is characterized by being provided with a measuring frame consisting of linear guide rails;
the guide rail sliding block is movably arranged on the linear guide rail of the measuring frame;
the laser displacement sensor is fixedly arranged on the guide rail sliding block;
the measuring frame moves along with the linear guide rail of the base bracket.
2. The non-contact cylindricity measuring instrument according to claim 1, wherein a workpiece to be measured is disposed in the frame of the measuring stand.
3. The non-contact cylindricity measuring instrument according to claim 1, wherein said measuring frame is provided with a first measuring point, a second measuring point and a third measuring point which are located at different positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922466277.4U CN210893022U (en) | 2019-12-31 | 2019-12-31 | Non-contact cylindricity measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922466277.4U CN210893022U (en) | 2019-12-31 | 2019-12-31 | Non-contact cylindricity measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210893022U true CN210893022U (en) | 2020-06-30 |
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ID=71324989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922466277.4U Active CN210893022U (en) | 2019-12-31 | 2019-12-31 | Non-contact cylindricity measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210893022U (en) |
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2019
- 2019-12-31 CN CN201922466277.4U patent/CN210893022U/en active Active
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