CN112432626A - Ovality detection device and detection method - Google Patents
Ovality detection device and detection method Download PDFInfo
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- CN112432626A CN112432626A CN202011074938.XA CN202011074938A CN112432626A CN 112432626 A CN112432626 A CN 112432626A CN 202011074938 A CN202011074938 A CN 202011074938A CN 112432626 A CN112432626 A CN 112432626A
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The application discloses an ovality detection device and a detection method. The device comprises: the frame, locate rotary platform in the frame, drive arrangement, probe subassembly and control assembly, rotary platform's upper surface is used for placing the determinand, probe subassembly includes at least one probe, every probe can be in at least one plane a along circle b's radial reciprocating motion, every probe can contact the outward flange or the inward flange of determinand, and the determinand is fixed to the slip frictional force through the position department of contact, control assembly and every probe connection, can control every probe and carry out reciprocating motion. The method comprises the steps of clamping the maximum diameter point of an object to be detected through a probe assembly, observing whether the same point is clamped by forward rotation and reverse rotation in a forward and reverse rotation mode, and checking the ellipticity of the object to be detected. The invention has the advantages of reasonable design, simplicity, practicality, convenient operation, controllable and adjustable precision and small environmental interference.
Description
Technical Field
The invention relates to the technical field of machining, in particular to an ovality detection device and a detection method.
Background
Ovality is also called out-of-roundness, and refers to the difference between the maximum diameter and the minimum diameter of the cross section of a product with a circular section, such as a gear, round steel and a circular steel pipe, and is the value of ovality. The existing ellipticity detection device mainly adopts optical detection, generally has higher requirement on the cleanliness of a detection environment, and easily influences the light transmission effect due to the accumulation and the coverage of dust in a factory with more dust, thereby causing the problem of inaccurate detection result or incapability of working.
Disclosure of Invention
In view of the defects in the prior art, the present invention aims to provide an ovality detection apparatus and a detection method. The method or the device has the advantages of reasonable design, simplicity, practicability, convenient operation, controllable and adjustable precision and small environmental interference.
In one aspect, the present invention provides an ovality detecting apparatus, comprising:
a stander, a rotary platform arranged on the stander, a driving device, a probe assembly and a control assembly,
the upper surface of the rotary platform is used for placing an object to be tested, the rotary platform can perform bidirectional axial rotation in the plane a and can drive the object to be tested placed on the upper surface to perform axial rotation therewith, a rotary shaft capable of performing bidirectional rotation is arranged at the center of the rotary platform, one end of the rotary shaft is connected with the rotary platform, the other end of the rotary shaft is connected with the driving device,
the probe assembly comprises at least one probe which is positioned above the rotating platform, each probe can perform reciprocating movement along the radial direction of a circle b in the plane a, each probe can contact the outer edge or the inner edge of an object to be measured and fix the object to be measured through sliding friction force at the contact position, the reciprocating movement range of the probe does not exceed the upper surface of the rotating platform,
the control assembly is connected with each probe and can control each probe to perform reciprocating movement.
In the ovality detection device, the control assembly comprises a screw rod assembly and a connecting rod assembly,
the screw rod assembly comprises at least one screw rod, the connecting rod assembly comprises at least one connecting rod,
one end of each connecting rod is connected with one probe, the other end is provided with a sliding block,
each sliding block is sleeved on one screw rod and is in rotary connection with the screw rod.
In the above ovality detecting device, the control assembly includes a gear assembly, the gear assembly includes at least one gear, one end of each lead screw is disposed at a central axis of one of the gears, and the gears in the gear assembly rotate synchronously.
In the ovality detection device, the control assembly comprises a guide device fixed on the frame, the guide device is arranged along the extension direction of the screw rod, and the guide device is connected with the bottom end of each slide block in a sliding manner;
and/or each connecting rod is bent and comprises a first vertical rod, a first transverse rod, a second vertical rod and a second transverse rod which are sequentially connected end to end, the lower tail end of the first vertical rod is provided with one sliding block, one end of the second transverse rod is connected with one probe, and the first transverse rod is fixed on the rack in a sliding manner;
and/or the control assembly comprises at least one knob, and each knob is connected with the tail end of one lead screw.
In the ovality detection device, the probe assembly comprises four probes which can be uniformly distributed in at least one plane a along the direction of a circle b,
the gear assembly includes a first gear, a second gear and a third gear,
the edge of one side surface of the first gear is provided with first gear teeth, the first gear teeth are protruded and vertical to one side surface of the first gear and are uniformly distributed along the circumferential direction, the radial extension direction of the second gear is uniformly distributed with second gear teeth along the circumferential direction, the radial extension direction of the third gear is uniformly distributed with third gear teeth along the circumferential direction,
the second gear and the third gear are positioned on the same side of the first gear, are parallel to each other and are respectively vertical to the first gear, the second gear teeth and the third gear teeth are respectively meshed with the first gear teeth,
the screw rod assembly comprises a first screw rod, a second screw rod and a third screw rod,
the first screw rod penetrates through a middle shaft of the first gear and is averagely divided into two sections by the first gear: the surface spirals of the screw rod A and the screw rod B are opposite to each other, one end of the second screw rod penetrates through the middle shaft of the second gear, the other end of the second screw rod is rotationally fixed on the rack, one end of the third screw rod penetrates through the middle shaft of the third gear, the other end of the third screw rod is rotationally fixed on the rack, the surface spirals of the second screw rod and the third screw rod are opposite to each other,
the connecting rod assembly comprises four connecting rods, one end of each connecting rod is connected with one probe, the other end of each connecting rod is provided with a sliding block, and each sliding block is sleeved on the screw rod A, the screw rod B, the second screw rod or the third screw rod and is in rotary connection with the screw rod A, the screw rod B, the second screw rod or the third screw rod.
In the above-described ovality detecting device, the rotary platform is disposed horizontally,
and/or a detachable fixed shaft protruding upwards is arranged at the center of the upper surface of the rotating platform,
and/or the rotating platform is circular.
In the ovality detection device, an object to be detected is placed on the upper surface of the rotating platform, and the friction force between the lower surface of the object to be detected and the upper surface of the rotating platform is smaller than the friction force between the sliding block and the corresponding screw rod of the sliding block.
In the ovality detection device, the rack comprises a base and a shell fixed above the base, the shell comprises two layers and is respectively an outer shell and an inner shell, the top end of the outer shell is bottomless, the top end of the inner shell is provided with a bottom, the rotary platform is arranged right above the top end and parallel to the top end, and the driving device is fixed in the inner shell.
On the other hand, the ovality detection method provided by the invention comprises the following steps:
s1, fixing the object to be measured in a plane a by using a fixing component, wherein the fixed position is located at least one point at the outer edge or the inner edge of the object to be measured, and the at least one point is located on a circle b of the plane a where the outer edge or the inner edge of the object to be measured is located;
s2, at the fixed position, moving the fixing part a distance c away from the outer edge or the inner edge of the object to be tested along the radial direction of the circle b in the plane a; the distance c can be adjusted to the actual situation, to find the maximum diameter and the minimum diameter,
s3, making the object to be measured do two axial rotations in the plane a, wherein the axial rotations are opposite to each other, if the fixing component clamps the outer edge or the inner edge of the object to be measured during each axial rotation, recording clamping positions d1 and d2 each time so as to find the maximum diameter and the minimum diameter of the object to be measured,
and calculating the ellipticity;
if the positions d1 and d2 are relatively close to each other, such as the positions d1 and d2 are overlapped, the object to be detected is judged to have a bulge between the positions d1 and d2, if the positions d1 and d2 are relatively far away, such as the positions d1 and d2 are respectively positioned at two sides of the diameter of the object to be detected, the object to be detected is judged to have an ellipse in the plane a,
if the positions d1 and d2 are not overlapped or positioned at two sides of the diameter of the object to be measured, the distance c needs to be further adjusted;
optionally, in step S1, the at least one point located at the outer edge or the inner edge of the object at the fixed position is one point, two points, three points, four points, or five or more points,
preferably, in step S1, the fixed positions are located at four points on the outer edge or the inner edge of the object to be tested.
In the above method of detecting ovality, the ovality detecting apparatus is any one of the above, and the fixing member is the probe unit in the apparatus.
The invention has the following beneficial effects:
the method or the device of the invention checks whether the uneven diameter exists in the movement process to judge whether the ellipse problem exists or not by clamping at least one optimized four maximum diameter points, and simultaneously adopts a positive and negative rotation mode to observe whether the positive and negative clamping exists at the same point or not so as to improve the accuracy; the feeding control test precision of the lead screw is controlled, the rotation of the lead screw is converted into the linear movement of the probe, the precision of the feeding displacement is greatly improved, and the feeding amount of the probe is accurately controlled. The method or the device has the advantages of reasonable design, simplicity, practicability, convenient operation, controllable and adjustable precision and small environmental interference.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a side view of an ovality detection apparatus.
Fig. 2 is a top view of the apparatus of fig. 1 with the rotating platform 16 removed.
Fig. 3 is an enlarged perspective view of the gear assembly and a portion of the screw assembly connected thereto.
The reference numbers are as follows:
1 rack, 2 probes, 3 first gears, 4 second gears, 5 third gears, 6 first gear teeth, 7 second gear teeth, 8 third gear teeth, 10 second lead screw, 11 third lead screw, 12 lead screw A, 13 lead screw B, 14 connecting rods, 15 sliders, 16 rotating platforms, 17 rotating shafts, 19 first knobs, 20 second knobs, 21 first vertical rods, 22 first transverse rods, 23 second vertical rods, 24 second transverse rods, 25 bases, 26 outer shells, 27 fixing shafts, 28 boxes, 29 supporting arms, 30 sliding rails, 31 inner shells, 32 upper bottoms, 33 gear assemblies, 34 rotating feeding indication measuring heads, 36 power lines and 37 power switches.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
Example 1 ovality detection device
As shown in fig. 1 and 2, the present embodiment provides an ovality detecting apparatus including: a stander 1, a rotary platform 16, a probe assembly and a control assembly,
the frame 1 comprises a base 25 and a cylindrical shell fixed above the base 25, the shell comprises two layers, namely an outer shell 26 and an inner shell 31, the top end of the outer shell 26 is bottomless, the top end of the inner shell 31 is provided with an upper bottom 32,
the rotary platform 16 is arranged above the frame 1 and can rotate in two directions, is positioned right above the upper bottom 32 as shown in figure 1 and is parallel to and close to but not in contact with the upper bottom 32, the rotary platform 16 is circular and horizontally arranged and is used for placing an object to be measured, the center below the rotary platform 16 is connected with the upper end of the rotating shaft 17 and can rotate stably along with the axial rotation of the rotating shaft 17,
the center of the upper surface of the rotary platform 16 is provided with a fixing shaft 27 which protrudes upwards, the fixing shaft 27 can be used for fixing an object to be tested with a through hole in the center, the fixing shaft 27 is detachable, when the center of the object to be tested has no through hole, the fixing shaft 27 can be taken down, the object to be tested without the through hole is horizontally placed,
the lower end of the rotating shaft 17 passes through the upper bottom 32 and is connected with an output shaft of a driving device (such as a motor, not shown), the driving device is arranged in the box body 28, two sides of the box body 28 are respectively provided with a vertically extending supporting arm 29, the upper end of each supporting arm 29 is fixed on the lower surface of the upper bottom 32, the lower end of each supporting arm 29 is fixed on the outer surface of the box body 28, the driving device is electrically connected with one end of a power line 36, the other end of the power line 36 is electrically connected with a power switch 37, and the power switch 37 is arranged;
the probe assembly comprises four probes 2, the four probes 2 can be uniformly distributed along a circle b (the edge of the upper surface of the rotary platform 16 in fig. 1) in a plane a (the surface of the upper surface of the rotary platform 16 in fig. 1), as shown in fig. 1, the plane a is a horizontal plane, and can also be an inclined plane or a vertical plane, and is arranged according to actual needs,
the probe 2 is arranged above the rotary platform 16, and the reciprocating range of the probe 2 does not exceed the edge of the upper surface of the rotary platform 16;
the control assembly comprises a gear assembly 33, a screw rod assembly and a connecting rod assembly, can control the four probes 2 to do reciprocating movement in the radial direction of the circle b, and simultaneously achieves the purpose of radially inward movement or simultaneously radially outward movement;
as shown in fig. 3, the gear assembly 33 includes a first gear 3, a second gear 4 and a third gear 5,
a first gear tooth 6 is arranged on the edge of one side surface of the first gear 3, the first gear tooth 6 protrudes out and is vertical to one side surface of the first gear 3 and is evenly distributed along the circumferential direction, a second gear tooth 7 is evenly distributed along the circumferential direction on the radial extending direction of the second gear 4, a third gear tooth 8 is evenly distributed along the circumferential direction on the radial extending direction of the third gear 5,
the second gear 4 and the third gear 5 are positioned on the same side of the first gear 3, are parallel to each other and are respectively vertical to the first gear 3, and the second gear tooth 7 and the third gear tooth 8 are respectively meshed with the first gear tooth 6 so as to achieve the purpose of synchronous rotation;
as shown in fig. 2 and 3, the lead screw assembly includes a first lead screw, a second lead screw 10 and a third lead screw 11,
the first screw rod passes through the middle shaft of the first gear 3 and is averagely divided into two sections by the first gear 3: the surface spirals of the screw rod A12 and the screw rod B13 are opposite to each other so as to achieve the purpose of enabling the corresponding probes 2 to move oppositely, one end of the second screw rod 10 penetrates through the middle shaft of the second gear 4, the other end of the second screw rod is rotationally fixed on the rack 1, one end of the third screw rod 11 penetrates through the middle shaft of the third gear 5, the other end of the third screw rod is rotationally fixed on the rack 1, the surface spirals of the second screw rod 10 and the third screw rod 11 are opposite to each other so as to achieve the purpose of enabling the corresponding probes 2 to move oppositely,
the diameters of the first gear 3, the second gear 4 and the third gear 5 are the same, and the surface spiral sizes of the lead screw A12, the lead screw B13, the second lead screw 10 and the third lead screw 11 are the same, so that the moving distance and the speed of the probe 2 are ensured to be the same.
The connecting rod assembly comprises four connecting rods 14, one end of each connecting rod 14 is connected with one probe 2, the other end of each connecting rod is provided with a sliding block 15, and each sliding block 15 is respectively sleeved on and rotatably connected with a screw rod A12, a screw rod B13, a second screw rod 10 or a third screw rod 11;
as shown in fig. 1, each connecting rod 14 is bent and includes a first vertical rod 21, a first horizontal rod 22, a second vertical rod 23 and a second horizontal rod 24 which are sequentially connected end to end, a sliding block 20 is arranged at the lower end of the first vertical rod 21, a probe 2 is connected to the left end of the second horizontal rod 24, the first horizontal rod 22 is slidably fixed on the rack 1, specifically, the first horizontal rod 22 penetrates through the inner shell 31 and the outer shell 26, and the inner shell 31 and the outer shell 26 can support and stabilize the first horizontal rod 22;
the ovality detection device further comprises a first knob 19, wherein the first knob 19 is connected with the tail end of a first screw rod (a screw rod A12 or a screw rod B13) and is used for adjusting the rotation of the first screw rod and the synchronous rotation of other screw rods;
and/or the screw driver further comprises a second knob 20, wherein the second knob 20 is connected with the tail end of the second screw rod 10 and/or the tail end of the third screw rod 11 and is used for adjusting the rotation of the second screw rod 10 and/or the third screw rod 11 and the synchronous rotation of other screw rods;
the outer edge of the first knob 19 and/or the second knob 20 is provided with a rotary feed indication gauge head 34 for observing the rotation angle of the knobs,
in the above-mentioned ovality detecting device, a guiding device such as a slide rail 30 fixed on the frame 1 is further included, the guiding device is arranged along the extending direction of the screw rod a, the screw rod B, the second screw rod 10 and the third screw rod 11, and the guiding device is connected with the bottom end of each slide block 20 in a sliding manner.
Example 2 ovality detection method
Performed using the ovality detection device of example 1, the method comprising:
s1, fixing the object to be tested in a plane a (e.g. the plane of the upper surface of the rotary platform 16) by using a fixing component (i.e. the probe assembly), wherein the fixed position is located at four points at the outer edge or the inner edge of the object to be tested, and the four points are located on a circle b of the plane a at which the outer edge or the inner edge of the object to be tested is located;
s2, at the fixed position, the fixing part is away from the outer edge or the inner edge of the object to be measured by a certain distance c along the radial direction of the circle b in the plane a;
s3, enabling the object to be measured to make two axial rotations in the plane a, wherein the axial rotations are opposite to each other, and if the fixing component clamps the outer edge or the inner edge of the object to be measured during each axial rotation, recording the clamping positions d1 and d2 each time so as to find the maximum diameter and the minimum diameter and calculate the ellipticity;
if the positions d1 and d2 are relatively close to each other, such as the positions d1 and d2 are overlapped, the object to be detected is judged to have a bulge between the positions d1 and d2, if the positions d1 and d2 are relatively far away, such as the positions d1 and d2 are respectively positioned at two sides of the diameter of the object to be detected, the object to be detected is judged to have an ellipse in the plane a,
if the positions d1 and d2 are neither coincident nor located on both sides of the diameter of the object to be measured, the distance c needs to be further adjusted.
The method is suitable for detecting ovality of the outer edge or the inner edge of a product.
The detailed operation of the ovality detection device of example 1 is as follows:
placing a circular or elliptical object to be measured on the upper surface of the rotary platform 16, and if the object to be measured has a through hole in the center, placing the through hole into a fixed shaft 27 with a proper size; if the center of the object to be measured has no hole, the fixed shaft 27 is disassembled, and the object to be measured is flatly placed on the upper surface of the rotating platform 16;
after the object to be detected is placed, slightly rotating a first knob 19, wherein the first knob 19 rotates and drives a first screw rod to rotate, the first screw rod drives a first gear 3 to rotate, the first gear 3 drives a second gear 4, a second screw rod 10, a third gear 5 and a third screw rod 11 to rotate, and further drives four sliding blocks 15 to simultaneously move inwards along the screw rods and the sliding ways where the sliding blocks are located, so that four probes 2 synchronously and radially feed to the center of a rotating platform, namely the circle center of a circle b, when 4 probes are all in contact with the outer edge (or the inner edge) of the object to be detected, the object to be detected is located at the center position of the four probes, the rotation is stopped at the moment, the first knob 19 is rotated, and a little margin is released (so as to prevent the probes from being in excessive contact with the edge;
starting a driving device to enable the rotary platform 16 to start rotating, wherein the rotation can be performed clockwise or anticlockwise, and the driving device can realize reversing;
observing whether the rotation process has a clamping phenomenon, if so, indicating that the object to be detected has a certain degree of ellipse, and recording a clamping position d 1; reverse the rotating platform 16 to see the stuck position d 2;
when the rotary platform 16 rotates, the friction force between the upper surface of the rotary platform 16 and the lower surface of the object to be detected on the rotary platform is smaller than the friction force between the slide block and the corresponding screw rod thereof, so that the four probes 2 can be prevented from clamping the object to be detected instead of the object to be detected spreading the four probes 2 when abnormal clamping points occur;
before rotation, after the probe 2 clamps an object to be measured, the first knob 19 needs to be slightly rotated, a certain space (namely, the distance c) is released, so that the object to be measured can rotate conveniently, the released space depends on the allowed error of the object to be measured, the feeding amount is determined by the screw pitch of the screw rod, the screw pitch of the screw rod is small, the feeding unit is smaller, the precision is higher, the screw pitch of the screw rod is large, the feeding unit is larger, the precision is poorer, when the ovality is required to be less than 0.1mm, the distance between each circle of the screw rod and the screw is not more than 0.5mm, and the rotation is 1/10 circles;
the amount of rotation can be observed by the change of the scale indicated by the indicating gauge 34 by rotating the first knob 19, and the probe 2 can also be monitored.
The method or apparatus can be used to test both toothed grooved round products such as gears and ungrooved round products.
Those not described in detail in this specification are within the skill of the art. The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An ovality detection device, comprising: a stander, a rotary platform arranged on the stander, a driving device, a probe assembly and a control assembly,
the upper surface of the rotary platform is used for placing an object to be tested, the rotary platform can perform bidirectional axial rotation in the plane a and can drive the object to be tested placed on the upper surface to perform axial rotation therewith, a rotary shaft capable of performing bidirectional rotation is arranged at the center of the rotary platform, one end of the rotary shaft is connected with the rotary platform, the other end of the rotary shaft is connected with the driving device,
the probe assembly comprises at least one probe which is positioned above the rotating platform, each probe can perform reciprocating movement along the radial direction of a circle b in the plane a, each probe can contact the outer edge or the inner edge of an object to be measured and fix the object to be measured through sliding friction force at the contact position, the reciprocating movement range of the probe does not exceed the upper surface of the rotating platform,
the control assembly is connected with each probe and can control each probe to perform reciprocating movement.
2. The ovality detection device according to claim 1, characterized in that the control assembly comprises a lead screw assembly and a connecting rod assembly,
the screw rod assembly comprises at least one screw rod, the connecting rod assembly comprises at least one connecting rod,
one end of each connecting rod is connected with one probe, the other end is provided with a sliding block,
each sliding block is sleeved on one screw rod and is in rotary connection with the screw rod.
3. The ovality detection device according to claim 2, wherein the control assembly comprises a gear assembly, the gear assembly comprises at least one gear, one end of each lead screw is arranged at a central axis of one of the gears, and the gears in the gear assembly rotate synchronously.
4. The ovality detection device according to claim 2, characterized in that said control assembly comprises a guide fixed to said frame, said guide being disposed along the extension direction of said screw, said guide being slidably coupled to the bottom end of each of said sliders;
and/or each connecting rod is bent and comprises a first vertical rod, a first transverse rod, a second vertical rod and a second transverse rod which are sequentially connected end to end, the lower tail end of the first vertical rod is provided with one sliding block, one end of the second transverse rod is connected with one probe, and the first transverse rod is fixed on the rack in a sliding manner;
and/or the control assembly comprises at least one knob, and each knob is connected with the tail end of one lead screw.
5. Ovality detection device according to claim 3, characterized in that said probe assembly comprises four probes evenly distributed along the circle b in at least one plane a,
the gear assembly includes a first gear, a second gear and a third gear,
the edge of one side surface of the first gear is provided with first gear teeth, the first gear teeth are protruded and vertical to one side surface of the first gear and are uniformly distributed along the circumferential direction, the radial extension direction of the second gear is uniformly distributed with second gear teeth along the circumferential direction, the radial extension direction of the third gear is uniformly distributed with third gear teeth along the circumferential direction,
the second gear and the third gear are positioned on the same side of the first gear, are parallel to each other and are respectively vertical to the first gear, the second gear teeth and the third gear teeth are respectively meshed with the first gear teeth,
the screw rod assembly comprises a first screw rod, a second screw rod and a third screw rod,
the first screw rod penetrates through a middle shaft of the first gear and is averagely divided into two sections by the first gear: the surface spirals of the screw rod A and the screw rod B are opposite to each other, one end of the second screw rod penetrates through the middle shaft of the second gear, the other end of the second screw rod is rotationally fixed on the rack, one end of the third screw rod penetrates through the middle shaft of the third gear, the other end of the third screw rod is rotationally fixed on the rack, the surface spirals of the second screw rod and the third screw rod are opposite to each other,
the connecting rod assembly comprises four connecting rods, one end of each connecting rod is connected with one probe, the other end of each connecting rod is provided with a sliding block, and each sliding block is sleeved on the screw rod A, the screw rod B, the second screw rod or the third screw rod and is in rotary connection with the screw rod A, the screw rod B, the second screw rod or the third screw rod.
6. Ovality detection device according to claim 1, characterized in that the rotary platform is arranged horizontally,
and/or a detachable fixed shaft protruding upwards is arranged at the center of the upper surface of the rotating platform,
and/or the rotating platform is circular.
7. The ovality detection device according to claim 2, wherein an object to be tested is placed on the upper surface of the rotating platform, and the friction force between the lower surface of the object to be tested and the upper surface of the rotating platform is smaller than the friction force between the slide block and the corresponding screw rod.
8. The ovality detection device according to claim 1, wherein the rack comprises a base and a housing fixed above the base, the housing comprises two layers, namely an outer housing and an inner housing, the top end of the outer housing is bottomless, the top end of the inner housing is provided with an upper bottom, the rotating platform is arranged right above the upper bottom and parallel to the upper bottom, and the driving device is fixed in the inner housing.
9. An ovality detection method, characterized in that it comprises the steps of:
s1, fixing the object to be measured in a plane a by using a fixing component, wherein the fixed position is located at least one point at the outer edge or the inner edge of the object to be measured, and the at least one point is located on a circle b of the plane a where the outer edge or the inner edge of the object to be measured is located;
s2, at the fixed position, moving the fixing part a distance c away from the outer edge or the inner edge of the object to be tested along the radial direction of the circle b in the plane a;
s3, enabling the object to be measured to make two axial rotations in the plane a, wherein the axial rotations are opposite to each other, recording the positions d1 and d2 of the clamping each time if the fixing component clamps the outer edge or the inner edge of the object to be measured during each axial rotation, finding the maximum diameter and the minimum diameter of the object to be measured, and calculating the ellipticity;
preferably, in step S1, the fixed positions are located at four points on the outer edge or the inner edge of the object to be tested.
10. A method according to claim 9, wherein the method is carried out using an ovality detection apparatus according to any one of claims 1 to 8, the fixed component being the probe assembly in the apparatus.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899330A (en) * | 2021-08-19 | 2022-01-07 | 北京科技大学 | Full-automatic measurement system for spiral rib lead of cladding pipe |
| CN114543726A (en) * | 2022-03-22 | 2022-05-27 | 塔里木大学 | Rapid detection device and method for abrasion of cotton picker spindle |
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| CN114543726A (en) * | 2022-03-22 | 2022-05-27 | 塔里木大学 | Rapid detection device and method for abrasion of cotton picker spindle |
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