Axial dimension measuring tool

Abstract

The invention discloses an axial dimension measuring fixture, which is used for measuring the distance between the step surface of the end of a shaft and the shaft end surface, and comprises a shaft standard part and a shaft end surface positioning block placed on the shaft end surface, wherein a dial indicator fixture is provided on the shaft end surface positioning block, and the dial indicator is installed on the dial indicator fixture, wherein the axial direction of the measuring rod of the dial indicator is perpendicular to the step surface and perpendicular to the contact surface between the shaft end surface positioning block and the shaft end surface; firstly, the shaft end surface positioning block is placed on the shaft end surface of the shaft standard part, and the distance from the shaft end surface of the shaft standard part to the step surface is measured, and the reading is adjusted, and then the distance from the shaft end surface of a workpiece to be measured to the step surface is measured, and the reading of the measured workpiece can be known according to the reading of the pointer of the meter head.

Description

Technical Field

[0001] The invention relates to an axial dimension measuring tool. Background Art

[0002] As shown in the figure, the prior art can only use a general gauge when measuring the distance between the step surface at the end of the shaft and the end surface of the shaft, which is inconvenient to measure and the accuracy of the measurement result cannot be effectively guaranteed. Especially when the size of the step surface is small, the prior art is even more difficult to measure. Summary of the invention

[0003] In order to make up for the above shortcomings, the present invention provides an axial dimension measuring tool which is convenient for measurement and can effectively ensure accurate and reliable measurement results.

[0004] The technical solution of the present invention is: an axial dimension measuring fixture, used to measure the distance between the step surface of the shaft end and the shaft end face, comprising a shaft standard part and a shaft end face positioning block placed on the shaft end face, the shaft end face positioning block is provided with a dial indicator fixture, the dial indicator fixture is installed with the dial indicator, the axis direction of the measuring rod of the dial indicator is perpendicular to the step surface and perpendicular to the contact surface between the shaft end face positioning block and the shaft end face.

[0005] As a preferred technical solution, the dial indicator is detachably mounted on the dial indicator fixture.

[0006] As a preferred technical solution, the dial indicator fixture includes a mounting through hole arranged on the shaft end face positioning block, and the shaft end face positioning block is also provided with a tightening screw hole perpendicular to the mounting through hole, the tightening screw hole is connected to the mounting through hole, and a tightening bolt is screwed into the tightening screw hole.

[0007] As a preferred technical solution, it also includes a positioning ring, which is inserted from the end face of the shaft and one end face of the positioning ring is in contact with the step surface, the outer diameter of the positioning ring is larger than the outer diameter of the step surface, and the other end face of the positioning ring is in contact with the measuring rod of the dial indicator.

[0008] As a preferred technical solution, a circular groove is provided on the lower surface of the shaft end surface positioning block, a first guide groove extending along the diameter direction of the circular groove is provided on the upper wall of the circular groove, a first slider is movably installed in the first guide groove, a first clamping plate is fixedly installed on the first slider, a second guide groove opposite to the first guide groove extending along the diameter direction of the circular groove is provided on the upper wall of the circular groove, a second slider is movably installed in the second guide groove, a second clamping plate is fixedly installed on the second slider, a through hole penetrating upward to the shaft end surface positioning block is provided at the center of the circular groove, a rotating shaft is rotatably installed in the through hole, a rotating disk located in the circular groove is fixedly installed at the lower end of the rotating shaft, a first connecting rod is hinged between the rotating disk and the first slider, a second connecting rod is hinged between the rotating disk and the second slider, a hinge axis of the rotating disk and the first connecting rod is located outside the rotation center of the rotating disk, a hinge axis of the rotating disk and the second connecting rod is also located outside the rotation center of the rotating disk, and a rotation locking mechanism is provided between the rotating shaft and the shaft end surface positioning block.

[0009] As a preferred technical solution, the rotation locking mechanism includes a clamping sleeve and a threaded sleeve fixedly mounted on the upper surface of the shaft end face positioning block, the axis of the threaded sleeve coincides with the axis of the through hole, a limiting ring affixed to the upper surface of the shaft end face positioning block is fixedly mounted on the rotating shaft, the clamping sleeve has an external thread matching the internal thread of the threaded sleeve, and the clamping sleeve is sleeved outside the rotating shaft and pressed on the upper surface of the limiting ring.

[0010] Due to the adoption of the above technical scheme, an axial dimension measuring jig is provided, which is used to measure the distance between the step surface of the end of a shaft and the shaft end surface, and comprises a shaft standard part and a shaft end surface positioning block placed on the shaft end surface, the shaft end surface positioning block is provided with a dial indicator fixture, the dial indicator fixture is installed with the dial indicator, the axis direction of the measuring rod of the dial indicator is perpendicular to the step surface and perpendicular to the contact surface between the shaft end surface positioning block and the shaft end surface; firstly, the shaft end surface positioning block is placed on the shaft end surface of the shaft standard part, the distance from the shaft end surface of the shaft standard part to the step surface is measured, the reading is adjusted, and then the distance from the shaft end surface of the workpiece to be measured to the step surface is measured, and the reading of the measured workpiece can be known according to the reading of the pointer of the meter head. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0013] Figure 2 is a structural diagram of Embodiment 2 of the present invention;

[0014] Figure 3 is a schematic diagram of the structure of a shaft standard component in an embodiment of the present invention;

[0015] Figure 4 is a schematic diagram of the mechanism of the third embodiment of the present invention;

[0016] Figure 5 yes Figure 4 A partial enlarged view of point I in the middle. DETAILED DESCRIPTION

[0017] Embodiment 1:

[0018] like Figure 1 and Figure 3 As shown, an axial dimension measuring fixture is used to measure the distance between the step surface 1 at the end of the shaft and the shaft end surface 2, including a shaft standard part 3 and a shaft end surface positioning block 4 placed on the shaft end surface 2, the shaft end surface positioning block 4 is provided with a dial indicator fixture, the dial indicator fixture is installed with the dial indicator 5, the axis direction of the measuring rod 6 of the dial indicator 5 is perpendicular to the step surface 1 and perpendicular to the contact surface 7 between the shaft end surface positioning block and the shaft end surface. First, the shaft end surface positioning block is placed on the shaft end surface of the shaft standard part, the measuring rod of the dial indicator is pressed against the step surface of the shaft standard part, the reading is adjusted, and then the workpiece 10 to be measured is measured, the shaft end surface positioning block is placed on the shaft end surface of the workpiece 10 to be measured, so that the lower end of the measuring rod of the dial indicator is pressed against the step surface, and the reading of the measured workpiece can be known according to the reading of the pointer of the gauge head.

[0019] The dial indicator 5 is detachably mounted on the dial indicator fixture.

[0020] In order to realize the detachable installation of the dial indicator on the dial indicator fixture, the dial indicator fixture includes a mounting through hole arranged on the shaft end surface positioning block, and the shaft end surface positioning block is also provided with a tightening screw hole perpendicular to the mounting through hole, the tightening screw hole is connected with the mounting through hole, and a tightening bolt 8 is screwed into the tightening screw hole.

[0021] Embodiment 2:

[0022] like Figure 2As shown, the structure of the second embodiment is basically the same as that of the first embodiment, except that, in this embodiment, a positioning ring 9 is further included, the positioning ring 9 is inserted from the shaft end face 2 and one end face of the positioning ring 9 is fitted on the step face 1, the outer diameter of the positioning ring 9 is larger than the outer diameter of the step face 1, and the other end face of the positioning ring 9 is in contact with the measuring rod 6 of the dial gauge 5. When the outer diameter of the step face is small, the measuring rod of the dial gauge is not easy to be positioned on the step face, and the technical solution of this embodiment can be applied to effectively facilitate measurement. The outer diameter of the positioning ring 9 is larger than the outer diameter of the step face 1, so that the measuring rod of the dial gauge can act on the positioning ring easily, and the other end face of the positioning ring 9 is in contact with the measuring rod 6 of the dial gauge 5, and the positioning ring can be set as a standard part.

[0023] Embodiment three:

[0024] like Figure 4 and Figure 5As shown, the structure of the third embodiment is basically the same as that of the first embodiment, except that a circular groove 11 is provided on the lower surface of the shaft end face positioning block 4, a first guide groove 12 extending along the diameter direction of the circular groove is provided on the upper wall of the circular groove 11, a first slider 13 is movably installed in the first guide groove 12, a first clamping plate 14 is fixedly installed on the first slider 13, a second guide groove 15 opposite to the first guide groove 12 extending along the diameter direction of the circular groove 11 is provided on the upper wall of the circular groove 11, a second slider 19 is movably installed in the second guide groove, a second clamping plate 24 is fixedly installed on the second slider 19, and the center of the circular groove 11 is axially spaced from the center of the circular groove 11. A through hole is provided at the shaft end surface, which passes upward to the shaft end surface positioning block. A rotating shaft 16 is rotatably installed in the through hole. A rotating disk 17 located in the circular groove 11 is fixedly installed at the lower end of the rotating shaft 16. A first connecting rod 18 is hinged between the rotating disk 17 and the first slider 13. A second connecting rod 20 is hinged between the rotating disk 17 and the second slider 19. A hinge axis 26 between the rotating disk 17 and the first connecting rod 18 is located outside the rotation center of the rotating disk 17. A hinge axis 25 between the rotating disk 17 and the second connecting rod 20 is also located outside the rotation center of the rotating disk 17. A rotation locking mechanism is provided between the rotating shaft 16 and the shaft end surface positioning block 4. The rotating shaft can drive the rotating disk 17 to rotate. Since the hinge shaft 26 of the rotating disk 17 and the first connecting rod 18 is located outside the rotation center of the rotating disk 17, the hinge shaft 25 of the rotating disk 17 and the second connecting rod 20 is also located outside the rotation center of the rotating disk 17. The rotation of the rotating disk will drive the first slider and the second slider to move through the first connecting rod and the second connecting rod, thereby driving the first clamping plate and the second clamping plate to move relative to each other, so that the first clamping plate and the second clamping plate are clamped on the outer peripheral surface of the shaft end, thereby realizing the fixation of the shaft end face positioning block at the shaft end, and can adapt to shaft ends of different diameters, thereby facilitating the measurement of axial dimensions.

[0025] The rotation locking mechanism includes a clamping sleeve 21 and a threaded sleeve 22 fixedly mounted on the upper surface of the shaft end face positioning block, the axis of the threaded sleeve 22 coincides with the axis of the through hole, a stop ring 23 attached to the upper surface of the shaft end face positioning block is fixedly mounted on the rotating shaft 16, the clamping sleeve 21 has an external thread that matches the internal thread of the threaded sleeve 22, and the clamping sleeve 21 is sleeved outside the rotating shaft 16 and pressed against the upper surface of the stop ring 23. By rotating the clamping sleeve, due to the threaded fit between the clamping sleeve and the threaded sleeve, the clamping sleeve is pressed against the stop ring, which will prevent the stop ring from rotating relative to the upper surface of the shaft end face positioning block, thereby achieving the fixation of the relative position of the rotating shaft and the shaft end face positioning block.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An axial dimension measuring fixture, used to measure the distance between the step surface at the end of a shaft and the end face of the shaft, characterized in that: It comprises a shaft standard part and a shaft end face positioning block placed on the shaft end face, the shaft end face positioning block is provided with a dial gauge fixture, the dial gauge fixture is mounted with the dial gauge, and the axis direction of the measuring rod of the dial gauge is perpendicular to the step surface and perpendicular to the contact surface between the shaft end face positioning block and the shaft end face; The dial indicator is detachably mounted on the dial indicator fixture; The dial indicator fixture comprises a mounting through hole provided on the shaft end surface positioning block, the shaft end surface positioning block is also provided with a tightening screw hole perpendicular to the mounting through hole, the tightening screw hole is communicated with the mounting through hole, and a tightening bolt is screwed into the tightening screw hole; A circular groove is provided on the lower surface of the shaft end surface positioning block, a first guide groove extending along the diameter direction of the circular groove is provided on the upper wall of the circular groove, a first slider is movably installed in the first guide groove, a first clamping plate is fixedly installed on the first slider, a second guide groove extending along the diameter direction of the circular groove and opposite to the first guide groove is provided on the upper wall of the circular groove, a second slider is movably installed in the second guide groove, a second clamping plate is fixedly installed on the second slider, a through hole penetrating upward to the shaft end surface positioning block is provided at the center of the circular groove, a rotating shaft is rotatably installed in the through hole, a rotating disk located in the circular groove is fixedly installed at the lower end of the rotating shaft, a first connecting rod is hinged between the rotating disk and the first slider, a second connecting rod is hinged between the rotating disk and the second slider, a hinge axis of the rotating disk and the first connecting rod is located outside the rotation center of the rotating disk, a hinge axis of the rotating disk and the second connecting rod is also located outside the rotation center of the rotating disk, and a rotation locking mechanism is provided between the rotating shaft and the shaft end surface positioning block.

2. The axial dimension measuring jig according to claim 1, characterized in that: It also includes a positioning ring, which is inserted from the end face of the shaft and one end face of the positioning ring is in contact with the step face, the outer diameter of the positioning ring is larger than the outer diameter of the step face, and the other end face of the positioning ring is in contact with the measuring rod of the dial indicator.

3. The axial dimension measuring jig according to claim 1, characterized in that: The rotation locking mechanism includes a clamping sleeve and a threaded sleeve fixedly mounted on the upper surface of the shaft end face positioning block, the axis of the threaded sleeve coincides with the axis of the through hole, a limiting ring abutting the upper surface of the shaft end face positioning block is fixedly mounted on the rotating shaft, the clamping sleeve has an external thread matching the internal thread of the threaded sleeve, the clamping sleeve is sleeved outside the rotating shaft and pressed on the upper surface of the limiting ring.

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