Device for detecting precision of movable and fixed gates of electronic digital display micrometer

Abstract

The utility model discloses an electronic digital display micrometer movable and fixed gate precision detection device, which comprises a front fixed gate seat and a rear fixed gate seat and a threaded sleeve, and a rotating shaft penetrates through and is screwed in the fixed gate seat and the threaded sleeve; a positioning sleeve and a movable gate seat are fixedly mounted and sleeved on the rotating shaft on the front side of the fixed gate seat front and back, a guide screw is screwed on the movable gate seat, the guide screw is in sliding fit in a V-shaped guide groove axially formed in the rotating shaft, and a spring is pressed on the rotating shaft between the movable gate seat and the positioning sleeve; a movable grid and a fixed grid are respectively mounted on the opposite end surfaces of the movable grid seat and the fixed grid seat; the movable grid seat is pressed on the fixed grid seat by a spring so as to keep the movable grid and the fixed grid to be tightly attached; a fixed sleeve is mounted on the threaded sleeve, and a rotating sleeve sleeving the fixed sleeve is mounted at the rear end of the rotating shaft; a graduated scale for reading the moving distance of the rotating sleeve is arranged between the fixed sleeve and the rotating sleeve; and a display for converting angular displacement of the moving gate relative to the fixed gate into linear displacement through data processing and directly displaying data is arranged.

Description

Technical Field

[0001] This utility model relates to micrometer accuracy testing technology, specifically an electronic digital micrometer moving and fixed grid accuracy testing device. Background Technology

[0002] Electronic digital micrometers are a type of general-purpose measuring instrument widely used in geometric measurement. In practical applications, the accuracy of the mutual induction between the moving and fixed gratings has a significant impact on the overall measurement accuracy of the electronic digital micrometer.

[0003] Currently, the actual method used in production to test the accuracy of the moving and fixed micrometers is to install the moving and fixed micrometers into an electronic digital micrometer for testing. This method is very inconvenient to disassemble and assemble, and only a small number of tests are performed each time. As a result, this method is rarely used in production. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model proposes an electronic digital micrometer moving and fixed grid accuracy detection device.

[0005] The technical solution for the electronic digital micrometer moving and fixed grid accuracy testing device that can solve the problems of existing technologies is as follows:

[0006] 1. Includes a fixed grid seat and a threaded sleeve mounted coaxially at the front and rear, wherein a rotating shaft is inserted and screwed into the fixed grid seat and the threaded sleeve.

[0007] 2. A positioning sleeve and a moving grid seat are fitted on the front and rear of the rotating shaft on the front side of the fixed grid seat. A fastening screw is screwed onto the positioning sleeve to secure it to the rotating shaft. A guide screw is screwed onto the moving grid seat. The guide screw is slidably fitted into a "V"-shaped guide groove axially opened on the rotating shaft. A spring is press-fitted onto the rotating shaft between the moving grid seat and the positioning sleeve.

[0008] 3. The moving grid and the fixed grid are coaxially mounted on the opposite end faces of the moving grid seat and the fixed grid seat, respectively. The spring presses the moving grid seat onto the fixed grid seat to maintain a tight fit between the moving grid and the fixed grid.

[0009] 4. A fixed sleeve is coaxially mounted on the threaded sleeve, and a rotating sleeve fitted on the fixed sleeve is coaxially mounted on the rear end of the rotating shaft.

[0010] 5. A scale for reading the movement distance of the rotating sleeve is provided between the fixed sleeve and the rotating sleeve, and a display is provided to convert the angular displacement of the rotating grating relative to the fixed grating into linear displacement through data processing and directly display the data.

[0011] Furthermore, one structure of the scale includes scale I and scale II respectively engraved on the fixed sleeve and the rotating sleeve:

[0012] 1. The scale I includes horizontal graduations parallel to the axis and vertical graduations perpendicular to the axis. The horizontal graduations serve as the reference lines for circumferential readings, and the vertical graduations serve as the counting lines for axial movement distances.

[0013] 2. The scale II includes dozens or hundreds of horizontal graduation lines evenly distributed around the circumference and parallel to the axis.

[0014] The beneficial effects of this utility model are:

[0015] This utility model electronic digital micrometer moving and fixed grid accuracy testing device is a special inspection tool that separates the testing of the moving and fixed grids from the whole scale of the electronic digital micrometer. The moving and fixed grids are easy to disassemble and replace, and batch testing can be performed. The testing is accurate and reliable. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0017] Figure 2 for Figure 1 A schematic diagram of the internal structure of the implementation method.

[0018] Figure 3(a) is Figure 1 A schematic diagram of the fixed sleeve in the implementation method.

[0019] Figure 3(b) shows Figure 1 A schematic diagram of the rotating sleeve in the embodiment.

[0020] Part Number Identification: 1. Frame; 2. Fixed Grid Seat; 3. Threaded Sleeve; 4. Rotating Shaft; 4-1. "V"-shaped Guide Groove; 5. Positioning Sleeve; 6. Moving Grid Seat; 7. Moving Grid; 8. Fixed Grid; 9. Guide Screw; 10. Spring; 11. Fixed Sleeve; 11-1. Horizontal Gradient; 11-2. Vertical Gradient; 12. Rotating Sleeve; 12-1. Horizontal Gradient; 13. Display; 14. Base; 15. Fastening Screw. Detailed Implementation

[0021] The technical solution of the utility model will be further described below with reference to the embodiments shown in the accompanying drawings.

[0022] This utility model relates to an electronic digital micrometer moving and fixed grid accuracy testing device, comprising a frame 1 mounted on a base 14. The upper part of the frame 1 has front and rear mounting holes. A threaded sleeve 3 (with internal threads) is coaxially mounted in the middle and rear part of each mounting hole. A fixed grid seat 2, mounted on the front end of the frame 1, is positioned at the front end of the mounting hole. A rotating shaft 4 passes through the fixed grid seat 2 and the threaded sleeve 3. The shaft passes through the fixed grid seat 2 and the threaded sleeve 3 in such a way that the front part of the rotating shaft 4 is slidably fitted with the seat hole of the fixed grid seat 2, and the rear part of the rotating shaft 4 is externally threaded into the internally threaded hole of the threaded sleeve 3. An axial "V"-shaped guide groove 4-1 is provided on the front part of the rotating shaft 4. A fixed grid 8 is fitted on the front part of the rotating shaft 4, and the fixed grid 8 is coaxially and fixedly mounted on the front end face of the fixed grid seat 2. Figure 1 , Figure 2 As shown.

[0023] Positioning sleeves 5 and movable grid seats 6 are fitted onto the rotating shaft 4 on the front side of the fixed grid seat 2, respectively. The positioning sleeves 5 are secured to the rotating shaft 4 by radially screwed fastening screws 15. Radial guide screws 9 are screwed onto the movable grid seat 6, with the tips of the guide screws 9 slidingly engaged in a "V"-shaped guide groove 4-1 on the rotating shaft 4. A movable grid 7 is coaxially fixed to the rear end face of the movable grid seat 6. A spring 10 is press-fitted and pre-tightened between the positioning sleeves 5 and the movable grid seat 6. Under the elastic force of the spring 10, the movable grid seat 6 is pressed tightly against the fixed grid seat 2, thus ensuring that the movable grid 7 is always pressed against the fixed grid 8. Figure 1 , Figure 2 As shown.

[0024] A fixed sleeve 11 is coaxially mounted on the threaded sleeve 3, closely attached to the rear end face of the frame plate. A rotating sleeve 12 is coaxially mounted on the fixed sleeve 11. The rear end of the rotating shaft 4 extends out of the threaded sleeve 3, and the rotating sleeve 12 is coaxially mounted on the rear end of the rotating shaft 4. A scale is provided between the fixed sleeve 11 and the rotating sleeve 12 to read the axial movement distance of the rotating sleeve 12 (when the rotating sleeve 12 rotates). The frame plate is equipped with a display 13 that converts the angular displacement of the moving grid 7 relative to the fixed grid into linear displacement through data processing and directly displays the data. Figure 1 , Figure 2 As shown.

[0025] The scale includes a scale I engraved on the fixed sleeve 11 and a scale II engraved on the rotating sleeve 12. The scale I includes a horizontal scale line 11-1 parallel to the axis and multiple vertical scale lines 11-2 perpendicular to the axis. The horizontal scale line 11-1 serves as the reference line for circumferential reading, and the vertical scale lines 11-2 serve as counting lines. Among the seven equally spaced vertical scale lines 11-2, the vertical scale line 11-2 in the very middle is the "0" position. Three vertical scale lines 11-2 are engraved on the front and back sides of the "0" position vertical scale line 11-2. The scale II includes dozens or hundreds of horizontal scale lines 12-1 evenly distributed around the circumference and parallel to the axis. One of the horizontal scale lines 12-1 is set as the "0" position, as shown in Figures 3(a) and 3(b).

[0026] The working principle of this utility model is as follows:

[0027] 1. By zeroing the scale, the rotating sleeve 12 is positioned at the zero position on the fixed sleeve 11. At this time, the display 13 shows the data "0.000".

[0028] The adjustment method for returning to "zero" is as follows: the horizontal scale line 12-1 ("0" reading position) on the rotating sleeve 12 is aligned with the horizontal scale line 11-1 on the fixed sleeve 11, and the front end of the rotating sleeve 12 is aligned with the vertical scale line 11-2 ("0" reading position) in the middle of the fixed sleeve 11.

[0029] 2. Rotate the rotating sleeve 12 clockwise or counterclockwise to drive the rotating shaft 4 to rotate three times. The rotating sleeve 12 moves forward or backward by a distance equal to three vertical scale lines 11-2. At this time, the front end of the rotating sleeve 12 is aligned with the vertical scale line 11-2 corresponding to the "3" reading position on the fixed sleeve 11.

[0030] 3. At the same time, the rotating shaft 4 synchronously drives the moving grid 7 to rotate three times. The angular displacement (3×360°) of the moving grid 7 rotating three times is converted into linear displacement and the value is directly displayed on the display 13.

[0031] 4. Compare the axial displacement readings of the three sections of the rotating sleeve 12 with the values ​​displayed on the display 13. The difference between the two is the accuracy of the indication of the moving and fixed grids.

[0032] For example: The internal thread pitch of the threaded sleeve 3 is set to 0.5mm, the axial movement distance of the rotating sleeve 12 in one revolution is set to 0.5mm, and the spacing of the vertical scale lines 11-2 is correspondingly set to 0.5mm. When the vertical scale line 11-2 at position "0" is aligned with the front end face of the rotating sleeve 12, the value displayed on the monitor 13 is "0.000". When the moving grid 7 rotates one revolution relative to the fixed grid 8, its angular displacement is converted into linear displacement, and the value displayed on the monitor 13 is 0.5mm (theoretical value). The circumference of the rotating sleeve 12 is divided into 100... The value displayed on the display 13 for each rotation of the rotating sleeve 12 is 0.005mm (greater than the resolution of the display 13). For each rotation of the rotating sleeve 12, the value on the display 13 changes by 0.005mm. When the rotating sleeve 12 rotates one full rotation, the value on the display 13 continuously increases to 0.5mm (theoretical value). The axial movement distance of the rotating sleeve 12 can be continuously read within one or two rotations or more. The difference between the reading and the actual value on the display 13 (not the theoretical value) is the accuracy of the moving and fixed grid.

Claims

1. An electronic digital micrometer moving and fixed grid accuracy testing device, characterized in that: It includes a fixed grid seat (2) and a threaded sleeve (3) installed coaxially at the front and rear, and a rotating shaft (4) is inserted and screwed into the fixed grid seat (2) and the threaded sleeve (3); Positioning sleeves (5) and moving grid seats (6) are fitted on the front and rear of the rotating shaft (4) on the front side of the fixed grid seat (2). The positioning sleeve (5) is screwed with a fastening screw (15) that secures it to the rotating shaft (4). The moving grid seat (6) is screwed with a guide screw (9). The guide screw (9) is slidably fitted in the "V"-shaped guide groove (4-1) axially opened on the rotating shaft (4). A spring (10) is press-fitted on the rotating shaft (4) between the moving grid seat (6) and the positioning sleeve (5). The moving grid (6) and the fixed grid (2) are coaxially mounted on opposite end faces, respectively. The spring (10) presses the moving grid (6) onto the fixed grid (2) to maintain a tight fit between the moving grid (7) and the fixed grid (8). A fixed sleeve (11) is coaxially mounted on the threaded sleeve (3), and a rotating sleeve (12) fitted on the fixed sleeve (11) is coaxially mounted on the rear end of the rotating shaft (4). A scale for reading the moving distance of the rotating sleeve (12) is provided between the fixed sleeve (11) and the rotating sleeve (12), and a display (13) is provided to convert the angular displacement of the moving grid (7) relative to the fixed grid (8) into linear displacement and directly display the data through data processing.

2. The electronic digital micrometer moving and fixed grid accuracy testing device according to claim 1, characterized in that... The scale includes scale I and scale II respectively engraved on the fixed sleeve (11) and the rotating sleeve (12); The scale I includes a horizontal graduation line (11-1) parallel to the axis and a vertical graduation line (11-2) perpendicular to the axis. The horizontal graduation line (11-1) serves as the reference line for circumferential reading, and the vertical graduation line (11-2) serves as the counting line for axial movement distance. The scale II includes dozens or hundreds of horizontal graduation lines (12-1) evenly distributed around the circumference and parallel to the axis.

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