Detection tool for measuring coaxiality of detection holes of star wheel

Abstract

The utility model provides a detection tool for measuring the coaxiality of star wheel detection holes, which comprises a central shaft with taper at the upper end, a clutch type cam arranged at the straight wall in the middle of the central shaft, an ejector rod arranged above the clutch type cam, a flange plate arranged at the lower end of the central shaft, and sunken pits which are circumferentially distributed at the bottom of the flange plate and are used for selecting measurement points, a plurality of rotating handles for driving the flange plate to rotate are circumferentially arranged on the outer wall of the flange plate; the positioning sleeve is matched with the taper part of the center shaft and slides up and down under the action of the clutch type cam and the ejector rod, a plurality of sliding grooves are distributed in the positioning sleeve in the circumferential direction, a groove transversely extending inwards is formed in the outer wall of the positioning sleeve in the circumferential direction, and a tension spring is connected into the groove; the sliding plates are connected with the sliding grooves in a matched mode, mounting holes are formed in the sliding plates, and tension springs are connected into the mounting holes in a penetrating mode; and the measuring mechanism comprises a dial indicator positioned above the central shaft. The detection tool is simple in operation, rapid in point selection, and capable of improving the detection speed and rapidly obtaining data.

Description

Technical Field

[0001] The utility model relates to the technical field of inspection tools, in particular to an inspection tool for measuring the coaxiality of a star wheel detection hole. Background Art

[0002] At present, the coaxiality of the star wheel detection hole is detected by three-coordinate measurement. The measurement error of the coaxiality is often larger than the actual error, which is another common problem in the field of three-coordinate measurement. The main reasons are the lack of in-depth analysis of the workpiece, unreasonable configuration of the probe components, inappropriate measurement methods, etc.; due to equipment problems or software problems, the three-coordinate measuring machine runs slowly, and the detection speed is slow, which cannot provide timely detection data for production. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a measuring tool for measuring the coaxiality of a star wheel detection hole, which has the advantages of simple operation, quick point selection, improved detection speed and rapid data acquisition.

[0004] Based on the above problems, the technical solution proposed by the utility model is a gauge for measuring the coaxiality of a star wheel detection hole, comprising a center shaft with a taper at the upper end arranged on a base, a clutch cam installed at the straight wall in the middle of the center shaft, a push rod installed above the clutch cam, a flange plate arranged at the lower end of the center shaft, circumferentially distributed dimples for selecting measuring points arranged at the bottom of the flange plate, a plurality of rotating handles for driving the flange plate to rotate arranged circumferentially on the outer wall of the flange plate, and a double bearing arranged at the step below the center shaft; a positioning sleeve, which cooperates with the tapered part of the center shaft and slides up and down under the action of the clutch cam and the push rod, a plurality of sliding grooves are distributed circumferentially on the positioning sleeve, a groove extending laterally inward is arranged on the outer wall of the positioning sleeve, and a tension spring is connected in the groove; sliding plates are respectively connected with the sliding grooves, mounting holes are arranged on the sliding plates, and tension springs are passed through the mounting holes to tighten the sliding plates inward; a measuring mechanism comprises a dial indicator located above the center shaft.

[0005] The base is vertically connected with a cushion sleeve, the top of which is horizontally connected with a push rod mounting plate, a guide hole is arranged on the push rod mounting plate, the push rod is mounted in the guide hole, and the lower end of the push rod abuts against the low position of the clutch cam.

[0006] A central axis rotation positioning mechanism is installed on the base near the center of the base, and the central axis rotation positioning mechanism is composed of a steel ball, a spring and a top screw.

[0007] A bearing hole is arranged in the center of the base, a bearing is inlaid on the shaft head at the lower step of the central shaft, and the shaft head and the bearing are fixed in the bearing hole.

[0008] A cam handle is connected to the circumferential side of the clutch cam.

[0009] The inclination of the inner side surface of the sliding plate is consistent with the taper of the central axis.

[0010] One side of the base is vertically connected to a mounting plate, a linear guide rail is installed on the mounting plate, and the connecting plate, the dial indicator mounting plate, the adjustment sleeve and the connecting plate handle are installed on the slider of the linear guide rail, wherein the connecting plate is installed on the inner side of the mounting plate, the dial indicator mounting plate is installed on the other side of the connecting plate, the dial indicator is installed on the dial indicator mounting plate, and an adjustment sleeve is provided at the connection between the dial indicator and the dial indicator mounting plate.

[0011] A lower positioning plate is arranged on the mounting plate at the lower end of the connecting plate handle in a direction perpendicular to the connecting plate, and a stop pin for limiting the connecting plate is arranged on the lower positioning plate.

[0012] Advantages and beneficial effects of the utility model:

[0013] In the present application, several key components with the same taper are provided. The cone attached to the central axis moves up and down. Under the influence of the change in the diameter of the large end and the small end of the cone, the sliding plate is pushed and pulled to implement tensioning and contraction of the workpiece, thereby achieving the purpose of fixing one hole in the inner cavity of the workpiece and measuring the coaxiality of the other hole. The operation is simple, the point selection is quick, the detection speed is improved, and the data is quickly acquired. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the utility model.

[0015] Figure 2 It is a side view of the utility model.

[0016] In the figure: 1. base; 2. mounting plate; 3. push rod mounting plate; 4. center axis; 5. positioning sleeve; 6. sliding plate; 7. push rod; 8. clutch cam; 9. cushion sleeve; 10. rotating handle; 11. connecting plate; 12. dial indicator mounting plate; 13. adjusting sleeve; 14. lower positioning plate; 15. cam handle; 16. connecting plate handle; 17. stop pin; 18. bearing; 19. linear guide; 20. center axis rotation positioning mechanism. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0018] like Figure 1-Figure 2As shown, the technical solution proposed by the utility model is a gauge for measuring the coaxiality of a star wheel detection hole, comprising a center shaft 4 with a taper at the upper end arranged on a base 1, a clutch cam 8 installed at the straight wall in the middle of the center shaft 4, a push rod 7 installed above the clutch cam 8, a flange plate at the lower end of the center shaft 4, a circumferentially distributed depression for selecting a measuring point is arranged at the bottom of the flange plate, a plurality of rotating handles 10 for driving the flange plate to rotate are arranged circumferentially on the outer wall of the flange plate, and a double bearing 18 is arranged at the step below the center shaft 4; a positioning sleeve 5 cooperates with the tapered part of the center shaft 4 and slides up and down under the action of the clutch cam 8 and the push rod 7, a plurality of sliding grooves are distributed circumferentially on the positioning sleeve 5, a groove extending laterally inward is arranged circumferentially on the outer wall of the positioning sleeve 5, and a tension spring is connected in the groove; sliding plates 6 are respectively connected with the sliding grooves, mounting holes are arranged on the sliding plates 6, and tension springs are passed through the mounting holes to tighten the sliding plates 6 inward; a measuring mechanism comprises a dial indicator located above the center shaft 4.

[0019] The double bearings 18 guide the central shaft 4 and reduce friction, allowing the central shaft 4 to rotate freely.

[0020] Preferably, the tapered portion of the central shaft 4 is 20 mm long and has a taper of 24°. A screw and a flat washer are installed in the threaded hole at the top of the tapered portion, and a spring is installed under the flat washer to compress the mating piece with the central shaft 4 .

[0021] Correspondingly, the positioning sleeve 5 is a workpiece that matches the taper of the central shaft 4, and the inner hole is a tapered hole with a taper of 24°. The positioning sleeve 5 relies on the taper of the central shaft 4 and can slide up and down under the action of the clutch cam 8 and the push rod 7.

[0022] Furthermore, six sliding grooves with a width of 5 cm and a height of 17.5 cm are distributed circumferentially on the positioning sleeve 5 .

[0023] Furthermore, the sliding plate 6 is a main workpiece that cooperates with the positioning sleeve 5 and the central shaft 4 , and the inclination of the inner side surface of the sliding plate 6 is consistent with the taper of the central shaft 4 .

[0024] The base 1 is vertically connected to a cushion sleeve 9, the top of which is laterally connected to a push rod mounting plate 3, a guide hole is provided on the push rod mounting plate 3, the push rod 7 is mounted in the guide hole, and the lower end of the push rod 7 is against the clutch cam 8 at a low position.

[0025] A central axis rotation positioning mechanism 20 is installed on the base 1 near the center of the base 1 , and the central axis rotation positioning mechanism 20 is composed of a steel ball, a spring and a top screw.

[0026] A bearing hole is arranged in the center of the base 1 , and a bearing 18 is inlaid on the shaft head at the lower step of the central shaft 4 , and the shaft head and the bearing 18 are fixed in the bearing 18 hole.

[0027] A cam handle 15 is connected to the circumference of the clutch cam 8 .

[0028] One side of the base 1 is vertically connected to the mounting plate 2, and a linear guide 19 is installed on the mounting plate 2. The connecting plate 11, the dial indicator mounting plate 12, the adjusting sleeve 13 and the connecting plate handle 16 are installed on the slider of the linear guide 19, wherein the connecting plate 11 is installed on the inner side of the mounting plate 2, the dial indicator mounting plate 12 is installed on the other side of the connecting plate 11, the dial indicator is installed on the dial indicator mounting plate 12, and the adjusting sleeve 13 is provided at the connection between the dial indicator and the dial indicator mounting plate 12.

[0029] On the mounting plate 2 at the lower end of the connecting plate handle 16 , a lower positioning plate 14 is arranged in a direction perpendicular to the mounting plate 2 , and a stop pin 17 for limiting the connecting plate 11 is arranged on the lower positioning plate.

[0030] The inspection process of using this inspection fixture to measure the coaxiality of the star wheel inspection hole is as follows:

[0031] Step 1: Pull the cam handle 15 clockwise, the clutch cam 8 rotates to the high position, and lifts the push rod 7.

[0032] Step 2: The push rod 7 pushes the positioning sleeve 5 and the six sliding plates 6 upward (in the direction of the taper diameter). As the positioning sleeve 5 moves toward the taper diameter of the central axis 4, a gap is generated between the inner inclined surface of the sliding plate 6 and the conical surface of the central axis 4. Under the inward pulling force of the Φ4 tension spring, the sliding plate 6 moves inward. The diameter of the circle formed by the six sliding plates 6 is reduced.

[0033] Step 3: Move the inner cavity of the workpiece (star wheel) downward with its major diameter, and put it on the positioning sleeve 5.

[0034] Step 4: Push the cam handle 15 counterclockwise, the clutch cam 8 rotates to the low position, the positioning sleeve 5 and the push rod 7 fall back in the direction of the large diameter of the taper under the weight of the workpiece and the tooling itself and the pressure of the spring at the top of the center shaft 4, and the sliding plate 6 passes through the sliding groove of the positioning sleeve 5 and expands outward under the action of the large diameter of the taper of the center shaft 4, tightening the large diameter of the inner cavity of the workpiece.

[0035] Step 5: Install the lever dial indicator on the dial indicator mounting plate 12, the adjustment sleeve 13 and the connecting plate 11, and synchronize the rise and fall of the slider on the linear guide 19. Pull the connecting plate handle 16 to slide the connecting plate 11, the slider and the dial indicator down, and the dial indicator probe penetrates 5mm into the other inner hole of the workpiece, with a depth of 0.2-0.3mm.

[0036] Step 6: Move the center axis 4 and the rotating handle 10 to rotate the flange of the center axis 4. Under the action of the rotation positioning device of the center axis 4 and the four sinks at the bottom of the flange, select four measuring points to obtain accurate measurement data.

[0037] Step 7: Pull the cam handle 15 clockwise to rotate the clutch cam 8 to the high position. The push rod 7 rises in the direction of the taper diameter to lift the positioning sleeve 5. The six sliding plates 6 shrink inward under the action of the tension spring to remove the workpiece.

[0038] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A gauge for measuring the coaxiality of a star wheel detection hole, characterized in that: It includes a central axis with a taper at the upper end arranged on a base, a clutch cam installed at the straight wall in the middle of the central axis, a push rod installed above the clutch cam, a flange plate at the lower end of the central axis, circumferentially distributed dimples for selecting measuring points are arranged at the bottom of the flange plate, a plurality of rotating handles for driving the flange plate to rotate are arranged circumferentially on the outer wall of the flange plate, and a double bearing is arranged at the step below the central axis; a positioning sleeve cooperates with the tapered part of the central axis and slides up and down under the action of the clutch cam and the push rod, a plurality of sliding grooves are distributed circumferentially on the positioning sleeve, a groove extending laterally inward is arranged circumferentially on the outer wall of the positioning sleeve, and a tension spring is connected in the groove; sliding plates are respectively connected with the sliding grooves, mounting holes are arranged on the sliding plates, and tension springs are passed through the mounting holes to tighten the sliding plates inward; a measuring mechanism includes a dial indicator located above the central axis.

2. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 1, characterized in that: The base is vertically connected with a cushion sleeve, the top of which is horizontally connected with a push rod mounting plate, a guide hole is arranged on the push rod mounting plate, the push rod is mounted in the guide hole, and the lower end of the push rod abuts against the low position of the clutch cam.

3. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 1, characterized in that: A central axis rotation positioning mechanism is installed on the base near the center of the base, and the central axis rotation positioning mechanism is composed of a steel ball, a spring and a top screw.

4. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 1, characterized in that: A bearing hole is arranged in the center of the base, a bearing is inlaid on the shaft head at the lower step of the central shaft, and the shaft head and the bearing are fixed in the bearing hole.

5. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 1, characterized in that: A cam handle is connected to the circumferential side of the clutch cam.

6. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 1, characterized in that: The inclination of the inner side surface of the sliding plate is consistent with the taper of the central axis.

7. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 1, characterized in that: One side of the base is vertically connected to a mounting plate, a linear guide rail is installed on the mounting plate, and the connecting plate, the dial indicator mounting plate, the adjustment sleeve and the connecting plate handle are installed on the slider of the linear guide rail, wherein the connecting plate is installed on the inner side of the mounting plate, the dial indicator mounting plate is installed on the other side of the connecting plate, the dial indicator is installed on the dial indicator mounting plate, and an adjustment sleeve is provided at the connection between the dial indicator and the dial indicator mounting plate.

8. The gauge for measuring the coaxiality of the star wheel detection hole according to claim 7, characterized in that: A lower positioning plate is arranged on the mounting plate at the lower end of the connecting plate handle in a direction perpendicular to the connecting plate, and a stop pin for limiting the connecting plate is arranged on the lower positioning plate.

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