A depth gauge for shaft structures

Abstract

The present application provides a depth gauge for a shaft structure, including a measuring rod 1, a radially moving cylinder 2, a bracket 3, and a circumferentially moving swing arm 4, wherein: The measuring rod 1 includes a graduated rod, a probe rod, and a probe. The graduated rod has depth measurement size graduation lines with a measurement accuracy of 1 mm, and the measured values increase sequentially from bottom to top. There is a preset distance from the 0 graduation line to the lower end face; The radially moving cylinder 2 includes an upper semi-cylinder and a lower cylinder. The upper semi-cylinder of the radially moving cylinder 2 has size graduation lines for reading out the depth of the precise measurement point; The bracket 3 is in a ring structure. The upper end face of the bracket 3 has an annular circumferential movement track, and the outer edge of the track has angle graduation lines. At least three strip-shaped support ears are evenly arranged on the outside of the bracket 3, and each support ear has graduation lines on the back, which increase sequentially from inside to outside for positioning the center reference; The circumferentially moving swing arm 4 is in a plate-shaped long strip structure, and the circumferentially moving swing arm 4 has a track through slot.

Description

Technical Field

[0001] The present invention belongs to the field of machinery, and particularly relates to a depth measuring instrument for shaft structures. Background Art

[0002] During the production and processing process, there are often situations where the measurement reference is far from the measurement point, and the center of the measurement object has a shaft structure, which causes certain inconvenience to the measurement. Moreover, in the actual measurement process, the plane coordinates of the measurement point are often required.

[0003] The traditional depth measuring instrument consists of a cantilever bracket and a measuring ruler. However, due to the short length of the cantilever bracket, the position of the measurement point cannot be known.

[0004] Therefore, there is an urgent need for a new type of portable depth measuring instrument that can not only measure the depth of the measurement point but also measure the plane coordinates of the measurement point. Summary of the Invention

[0005] The present invention provides a depth measuring instrument for shaft structures. This measuring instrument is mainly aimed at the inconvenience caused by the far distance between the measurement reference and the measurement point and the shaft-like characteristic structure in the center of the measurement object to the measurement. Moreover, this new type of portable depth measuring instrument has the ability to measure the plane coordinates of the measurement point.

[0006] Technical Solution: A depth measuring instrument for shaft structures includes a measuring rod 1, a radially moving cylinder 2, a bracket 3, and a circumferentially moving rotating arm 4, wherein:

[0007] The measuring rod 1 includes a graduated rod, a probe rod, and a probe. The graduated rod has depth measurement scale lines with a measurement accuracy of 1 mm, and the measured values increase sequentially from bottom to top. There is a preset distance from the 0 scale line to the lower end face; the radial movement cylinder 2 includes an upper semi-cylinder and a lower cylinder. The upper semi-cylinder of the radial movement cylinder 2 has dimension scale lines for reading the accurate depth of the measurement point; the bracket 3 is a ring structure. The upper end face of the bracket 3 has a circumferential movement track in a ring shape, and the outer edge of the track has angle scale lines. At least three strip-shaped support ears are evenly arranged on the outside of the bracket 3, and each support ear has scale lines on the back, increasing sequentially from inside to outside for positioning the center reference; the circumferential movement swing arm 4 is a plate-shaped long strip structure. The circumferential movement swing arm 4 has an orbital through slot, and the measuring rod 1 is arranged in the orbital through slot of the circumferential movement swing arm 4 through the radial movement cylinder 2. The measuring rod 1 can move along the orbital through slot with the radial movement cylinder 2, and the measuring rod 1 moves vertically inside the radial movement cylinder 2; cylindrical movement cylinders are arranged on both sides of the circumferential movement swing arm 4. The two cylindrical movement cylinders of the circumferential movement swing arm 4 are placed on the circumferential movement track of the bracket 3. There is a radial track between the two cylindrical movement cylinders. The two ends of the track are straight tracks, and the middle of the track is an arc-shaped track; the edge of the track of the circumferential movement swing arm 4 has radius scale lines, the scale at the middle position of the slideway is 0, and the scale of the straight slideway increases towards both sides. The arc-shaped track has angle scale lines, and the middle scale of the arc-shaped track is 0 and increases towards both sides in sequence.

[0008] Specifically, the cylindricity of the outer surface of the graduated rod of the measuring rod 1 is guaranteed to be within 0.005 mm, and the coaxiality of the outer cylinder of the probe rod and the outer cylinder of the measuring rod is guaranteed to be within 0.01 mm.

[0009] Specifically, the cylindricity of the inner hole of the radial movement cylinder 2 is within 0.008 mm, and the perpendicularity between the upper and lower planes of the radial movement cylinder 2 and the inner hole is within 0.01 mm.

[0010] Specifically, the measurement accuracy of the angle scale lines of the bracket 3 is 0.1°, and the angle measurement range is 0° to 360°; the parallelism between the two side faces of the circumferential track in the bracket 3 should be guaranteed to be within 0.005 mm, and the perpendicularity to the lower surface of the track is guaranteed to be within 0.005 mm; the measurement accuracy of the scale lines on the back of the support ears of the bracket 3 is 1 mm.

[0011] Specifically, the cylindricity of the cylindrical surface of the cylindrical movement cylinder is within 0.005 mm, and the perpendicularity between the two cylindrical surfaces of the cylindrical movement cylinder and the lower surface is within 0.005 mm.

[0012] Specifically, for the circumferential movement swing arm 4, the perpendicularity between the lower surface of the track and the side surface of the track is ensured within 0.01 mm; the measurement accuracy of the radius scale line of the circumferential movement swing arm 4 is 1 mm, and the accuracy of the angle scale line of the arc-shaped track is 0.1°; the parallelism between the two side surfaces of the track through groove of the circumferential movement swing arm 4 is within 0.005 mm, and the perpendicularity between the two side surfaces and the end surface of the slide rail is within 0.005 mm.

[0013] Specifically, there is a clearance fit of 0 - 0.01 mm between the outer diameter of the scale rod of the measuring rod 1 and the inner hole of the radial movement cylinder 2, ensuring that the measuring rod 1 can move freely up and down within the radial movement cylinder 2.

[0014] Specifically, there is a clearance fit of 0 - 0.01 mm between the radial movement sleeve 2 and the track of the circumferential movement swing arm 4, ensuring that the radial movement cylinder 2 can move freely within the track of the circumferential movement swing arm 4.

[0015] In summary, the present invention provides a depth measuring instrument for shaft structures, which can not only measure the depth of corresponding points, but also measure the plane coordinates of the measurement points. The design of the present invention mainly aims at objects with shaft structures in the middle that are not easy to measure. It can not only measure the depth of the measured points, but also avoid the interference of the shaft. The design of the present invention mainly aims at the situation where the reference distance is far from the measurement point and the ordinary new portable depth measuring instrument cannot find the reference plane. This new portable depth measuring instrument has at least three support ears, which can be easily placed on the reference plane, and the scale lines under the support ears enable this new portable measuring instrument to quickly find the reference center. The measurement diagram of this new portable measuring instrument is as Figure 7 shown. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a depth measuring instrument for shaft structures provided by the present invention;

[0017] Figure 2 is a measuring rod provided by the present invention;

[0018] Figure 3 is a radial movement cylinder provided by the present invention;

[0019] Figure 4 is a bracket provided by the present invention;

[0020] Figure 5 is a top view of a circumferential movement swing arm provided by the present invention;

[0021] Figure 6 is a side view of a circumferential movement swing arm provided by the present invention;

[0022] Figure 7 is a schematic use diagram of a depth measuring instrument provided by the present invention;

[0023] Figure 8 The present invention provides a structural schematic diagram of a centrifugal pump to be measured;

[0024] Wherein: 1 - measuring rod, 2 - radially moving cylinder, 3 - bracket, 4 - circumferentially moving swing arm. Specific embodiments

[0025] Embodiment 1

[0026] As Figure 1 shown, the present invention provides a depth gauge for shaft structures, including a measuring rod 1, a radially moving cylinder 2, a bracket 3, and a circumferentially moving swing arm 4, wherein:

[0027] As Figure 2 shown, the measuring rod 1 includes a scale rod, a probe rod, and a probe. The scale rod has depth measurement size markings, with a measurement accuracy of 1 mm, and the measured values increase sequentially from bottom to top. There is a preset distance from the 0 scale line to the lower end face; As Figure 3 shown, the radially moving cylinder 2 includes an upper semi-cylinder and a lower cylinder. The upper semi-cylinder of the radially moving cylinder 2 has size markings for reading the depth of the precise measurement point; As Figure 4 shown, the bracket 3 is in a ring structure. The upper end face of the bracket 3 has a circumferential movement track in a ring shape, and the outer edge of the track has angle markings. At least three strip-shaped support ears are evenly arranged on the outside of the bracket 3, and each support ear has markings on the back, increasing sequentially from inside to outside, for positioning the center reference; As Figure 5 shown, the circumferentially moving swing arm 4 is in a plate-like long strip structure. The circumferentially moving swing arm 4 has a track through slot, and the measuring rod 1 is arranged in the track through slot of the circumferentially moving swing arm 4 through the radially moving cylinder 2. The measuring rod 1 can move along the track through slot along with the radially moving cylinder 2, and the measuring rod 1 moves vertically in the radially moving cylinder 2; As Figure 6 shown, cylindrical movement cylinders are arranged on both sides of the circumferentially moving swing arm 4. The two cylindrical movement cylinders of the circumferentially moving swing arm 4 are placed on the circumferential movement track of the bracket 3. There is a radial track between the two cylindrical movement cylinders. The two ends of the track are straight tracks, and the middle of the track is an arc-shaped track; The edge of the track of the radially moving swing arm 4 has radius markings. The middle position of the slideway is marked as 0, and the markings on the straight slideway increase towards both sides. The arc-shaped track has angle markings, and the middle marking of the arc-shaped track is 0 and increases sequentially towards both sides.

[0028] It should be noted that the depth gauge provided in this application is mainly applied to interference measurement of shaft structures in the middle. For example, the depth measurement of a centrifugal pump.

[0029] Furthermore, the cylindricity of the outer surface of the scale rod of the measuring rod 1 is ensured to be within 0.005 mm, and the coaxiality between the outer cylinder of the probe rod and the outer cylinder of the measuring rod is ensured to be within 0.01 mm.

[0030] Further, the cylindricity of the inner hole of the radial movement cylinder 2 is within 0.008 mm, and the perpendicularity between the upper and lower planes of the radial movement cylinder 2 and the inner hole is within 0.01 mm.

[0031] Further, the measurement accuracy of the angle scale line of the support 3 is 0.1°, and the angle measurement range is 0° to 360°; the parallelism between the two side surfaces of the circumferential track in the support 3 should be ensured within 0.005 mm, and the perpendicularity with the lower surface of the track should be ensured within 0.005 mm; the measurement accuracy of the scale line on the back of the support ear of the support 3 is 1 mm.

[0032] Further, the cylindricity of the cylindrical surface of the cylindrical movement cylinder is within 0.005 mm, and the perpendicularity between the two cylindrical surfaces of the cylindrical movement cylinder and the lower surface is within 0.005 mm.

[0033] Further, for the circumferential movement swing arm 4, the perpendicularity between the lower surface of the track and the side surface of the track is ensured within 0.01 mm; the measurement accuracy of the radius scale line of the circumferential movement swing arm 4 is 1 mm, and the accuracy of the angle scale line of the arc-shaped track is 0.1°; the parallelism between the two side surfaces of the track through slot of the circumferential movement swing arm 4 is within 0.005 mm, and the perpendicularity between the two side surfaces and the end face of the slide rail is within 0.005 mm.

[0034] Further, the diameter of the circle where the arc of the arc-shaped track of the circumferential movement swing arm 4 is located is determined according to the diameter of the middle axis of the object to be measured.

[0035] In practical applications, by replacing the circumferential movement swing arm 4 with arcs of different diameters, measurement objects with shafts of different diameters can be measured. And when the object to be measured has no middle axis, a linear guide rail without an arc can be used instead.

[0036] Further, there is a clearance fit of 0 to 0.01 mm between the outer diameter of the scale rod of the measuring rod 1 and the inner hole of the radial movement cylinder 2, ensuring that the measuring rod 1 can move freely up and down within the radial movement cylinder 2.

[0037] Further, there is a clearance fit of 0 to 0.01 mm between the radial movement sleeve 2 and the track of the circumferential movement swing arm 4, ensuring that the radial movement cylinder 2 can move freely within the track of the circumferential movement swing arm 4.

[0038] Further, there is a clearance fit of 0 to 0.005 mm between the scale rod of the measuring rod 1 and the width of the through slot of the circumferential movement swing arm 4, ensuring that the measuring rod 1 can move freely within the through slot of the circumferential movement swing arm.

[0039] Further, there is a clearance of 0 to 0.01 mm between the circumferential movement track on the support 3 and the two cylindrical movement cylinders of the circumferential movement swing arm 4, and the center distance between the two cylindrical movement cylinders and the diameter tolerance of the center line of the slideway groove of the support 3 are controlled within ±0.003 mm.

[0040] Example 2

[0041] As Figure 8 shown, during the assembly process of the centrifugal pump impeller, it is often necessary to confirm whether the impeller assembly position is flat. However, due to the large outer diameter of the reference plane and the short support arm of the traditional portable depth measuring instrument, it cannot reach the reference plane. If a support is built for measurement, there is interference from the transmission shaft in the middle, resulting in difficulties in implementation, and the traditional portable depth measuring instrument cannot determine the coordinates of the measurement point.

[0042] The present invention provides a depth measuring instrument for shaft structures, which can not only measure the depth of the measured point, but also measure the position of the measured point, and select moving swing arms with different arc diameters according to the size of the intermediate shaft to avoid the inconvenience caused by the shaft to the measurement.

[0043] The present invention provides a depth measuring method for shaft structures, which is applied to the above-mentioned depth measuring instrument. The method includes:

[0044] Step 1. Build a support on the reference plane. When the scale lines below the three support lugs coincide with the outer edge of the reference circle and the readings are the same, find the center of the outer circle of the reference plane;

[0045] Step 2. Place the circumferential moving swing arm into the support track to ensure that the circumferential moving swing arm can rotate freely;

[0046] Step 3. Install the radial moving cylinder into the circumferential moving swing arm track to ensure that the radial moving cylinder can slide freely in the track;

[0047] Step 4. Install the measuring rod into the through slots of the radial moving cylinder and the circumferential moving swing arm to ensure that the measuring rod can move freely up and down and also radially along the circumferential moving swing arm;

[0048] Step 5. Move the lower end face of the measuring rod to the measurement point position through the circumferential moving swing arm and the radial moving cylinder, and determine the angular coordinate of the measurement point by reading the angle where the circumferential moving swing arm is located on the support;

[0049] Step 6. Determine the radial coordinate of the measurement point by reading the position dimension of the radial moving cylinder on the circumferential moving swing arm track;

[0050] Step 7. Determine the position of the measurement point according to the angular coordinate and the radial coordinate;

[0051] Step 8. At the position of the measurement point, subtract 1 mm from the size of the first scale line where the lower end face of the measuring rod exposes the upper surface of the radial moving cylinder to obtain the first depth h1;

[0052] Step 9. At the position of the measurement point, multiply the position where the scale line of the radial moving cylinder coincides with the scale line of the radial moving cylinder by the measurement accuracy of the radial moving cylinder to obtain the second depth h2;

[0053] Step 10. Obtain the depth of the measurement point position according to the sum of the first depth h1 and the second depth h2.

[0054] In summary, the present invention provides a depth measuring instrument for shaft structures, which can not only measure the depth of corresponding points, but also measure the plane coordinates of the measurement points. The design of the present invention is mainly aimed at objects with shaft structures in the middle that are not easy to measure. It can not only measure the depth of the measured points, but also avoid the interference of the shaft. The design of the present invention is mainly aimed at the situation where the reference distance is far from the measurement point and the ordinary new portable depth measuring instrument cannot find the reference plane. This new portable depth measuring instrument has at least three lugs, which can be conveniently placed on the reference plane, and the scale lines under the lugs enable this new portable measuring instrument to quickly find the reference center. The measurement diagram of this new portable measuring instrument is as Figure 7 shown.

Claims

1. A depth measuring instrument for shaft structures, characterized in that, It includes a measuring rod (1), a radially moving cylinder (2), a bracket (3), and a circumferentially moving swing arm (4), where: The measuring rod (1) includes a scale rod, a probe rod, and a probe. The scale rod has depth measurement size graduation lines with a measurement accuracy of 1 mm, and the measured values increase sequentially from bottom to top. There is a preset distance from the 0 graduation line to the lower end face; the radially moving cylinder (2) includes an upper semi-cylinder and a lower cylinder. The upper semi-cylinder of the radially moving cylinder (2) has size graduation lines for reading the exact depth of the measurement point; the bracket (3) is a ring structure. The upper end face of the bracket (3) has a circumferential moving track in a ring shape, and the outer edge of the track has angle graduation lines. At least three strip-shaped support ears are evenly arranged on the outside of the bracket (3), and each support ear has graduation lines on the back, increasing sequentially from inside to outside for positioning the center reference; the circumferentially moving swing arm (4) is a plate-shaped long strip structure. The circumferentially moving swing arm (4) has a track through slot. The measuring rod (1) is arranged in the track through slot of the circumferentially moving swing arm (4) through the radially moving cylinder (2). The measuring rod (1) can move along the track through slot as the radially moving cylinder (2) moves, and the measuring rod (1) moves vertically inside the radially moving cylinder (2); cylindrical moving cylinders are arranged on both sides of the circumferentially moving swing arm (4). The two cylindrical moving cylinders of the circumferentially moving swing arm (4) are placed on the circumferential moving track of the bracket (3). There is a radial track between the two cylindrical moving cylinders. The two ends of the track are straight tracks, and the middle of the track is an arc-shaped track; the edge of the track of the radially moving swing arm (4) has radius graduation lines. The middle position of the slideway is graduated as 0, and the graduations of the straight slideway increase towards both sides. The arc-shaped track has angle graduation lines, and the middle graduation of the arc-shaped track is 0 and increases sequentially towards both sides.

2. The depth gauge according to claim 1, wherein The cylindricity of the outer surface of the scale rod of the measuring rod (1) is guaranteed to be within 0.005 mm, and the coaxiality of the outer cylinder of the probe rod and the outer cylinder of the measuring rod is guaranteed to be within 0.01 mm.

3. The depth gauge according to claim 1, characterized in that, The cylindricity of the inner hole of the radially moving cylinder (2) is within 0.008 mm, and the perpendicularity between the upper and lower planes of the radially moving cylinder (2) and the inner hole is within 0.01 mm.

4. The depth gauge according to claim 1, characterized in that, The measurement accuracy of the angle graduation lines of the bracket (3) is 0.1°, and the angle measurement range is 0° to 360°; the parallelism between the two side faces of the circumferential track in the bracket (3) should be guaranteed to be within 0.005 mm, and the perpendicularity to the lower surface of the track is guaranteed to be within 0.005 mm; the measurement accuracy of the graduation lines on the back of the support ears of the bracket (3) is 1 mm.

5. The depth gauge according to claim 1, characterized in that, The cylindricity of the cylindrical surface of the cylindrical moving cylinder is within 0.005 mm, and the perpendicularity between the two cylindrical surfaces of the cylindrical moving cylinder and the lower surface is within 0.005 mm.

6. The depth gauge according to claim 1, wherein, For the circumferentially moving swing arm (4), the perpendicularity between the lower surface of the track and the side face of the track is guaranteed to be within 0.01 mm; the measurement accuracy of the radius graduation lines of the circumferentially moving swing arm (4) is 1 mm, and the accuracy of the angle graduation lines of the arc-shaped track is 0.1°; the parallelism between the two side faces of the track through slot of the circumferentially moving swing arm (4) is within 0.005 mm, and the perpendicularity between the two side faces and the end face of the slide rail is within 0.005 mm.

7. The depth gauge according to claim 1, characterized in that, The outer diameter of the graduated rod of the measuring rod (1) and the inner hole of the radially moving cylinder (2) have a clearance fit of 0 to 0.01 mm, ensuring that the measuring rod (1) can move freely up and down within the radially moving cylinder (2).

8. The depth gauge according to claim 1, characterized in that, The radially moving cylinder (2) and the track of the circumferentially moving swing arm (4) have a clearance fit of 0 to 0.01 mm, ensuring that the radially moving cylinder (2) can move freely within the track of the circumferentially moving swing arm (4).

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