CN111189372A - Femoral stem deflection angle visual inspection tool and detection method thereof - Google Patents
Femoral stem deflection angle visual inspection tool and detection method thereof Download PDFInfo
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- CN111189372A CN111189372A CN202010145708.1A CN202010145708A CN111189372A CN 111189372 A CN111189372 A CN 111189372A CN 202010145708 A CN202010145708 A CN 202010145708A CN 111189372 A CN111189372 A CN 111189372A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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Abstract
The invention provides a femoral stem deflection angle visual inspection tool and a detection method thereof, and the tool comprises a front die and a rear die which are provided with a vertical insertion cavity, wherein a vertical insertion positioning surface is arranged on the right side of the cavity, a first guide pin and a second guide pin which are tangent to the left side of a femoral stem of a standard forging are arranged at the bottom of the left side of the cavity, a deflection angle lambda DEG of a detection line which is determined by the first guide pin and the second guide pin and inclines towards the lower right side is the same as a deflection angle β DEG of the standard forging, the standard forging slides into the cavity by means of gravity, a cone tip of the standard forging is exposed from an exposed opening below the cavity, the horizontal width of the cavity inserted opening is just equal to the horizontal width of the widest part of a rotor crest between the standard forgings, and the forging to be inspected, which is exposed below the exposed opening of the cone tip of the femoral stem, is a qualified forging or an unqualified forging.
Description
Technical Field
The invention belongs to the technical field of physical irregular surface measurement detection tools, and particularly relates to a femoral stem deflection angle visual detection tool and a detection method thereof.
Background
However, when forging is carried out, the forging is affected by sudden changes of the temperature inside and outside the forging, the internal stress of the femoral stem forging easily causes the forging to generate warping deformation with different degrees in the process of rapidly cooling the surface of the forging, and the deflection angle of the forging is out of tolerance.
Disclosure of Invention
The technical problems solved by the invention are as follows: the technical problems that in the prior art, due to the fact that a femoral stem forging piece is cooled and shrunk, due to the influence of thermal stress, the femoral stem forging piece is prone to warping and deformation, the deflection angle of the femoral stem forging piece is out of tolerance, and whether the mass qualification detection of the deflection angle of the femoral stem forging piece can be achieved rapidly through visual inspection only under the condition that a vernier caliper is not used are solved.
The technical scheme includes that the femoral stem deflection angle visual inspection tool is characterized by comprising a front die and a rear die which are symmetrically distributed relative to a front axis and a rear axis of a vertical plane, an insertion detection tool for a penetrating type structure of a vertical long channel is formed by fastening the front die and the rear die into a whole in a front-rear fastening mode, a vertical insertion cavity which is symmetrical relative to the front axis and the rear axis is arranged in a die body formed by the front die and the rear die, a vertical insertion positioning surface is arranged on the right side of the insertion cavity and used for vertically righting a forged piece from the right side of the forged piece to ensure that the forged piece is vertically inserted in the cavity, the vertical insertion positioning surface is matched with the vertical insertion positioning surface, a first guide pin and a second guide pin are arranged at the bottom of the cavity of the rear die, the first guide pin and the second guide pin are horizontally arranged perpendicular to the vertical plane of the front die and the rear die, outer cylindrical surfaces of the first guide pin and the second guide pin are tangent to the left side of the standard forged piece when the forged piece is vertically inserted in the cavity, the standard forged piece, when the standard forged piece is inserted in the cavity, a standard forged piece, a straight line, a horizontal insertion hole is exposed from the bottom end of the standard forged piece, a horizontal insertion hole, a horizontal inserted forged piece, the standard forged piece, the horizontal angle of the forged piece is equal to-be-measured forged piece, when the forged piece, the standard forged piece, the straight line extended straight-to-be-measured-extended forged piece, the straight-extended forged piece, the straight-extended straight.
Further: for the detection that this front and back mould realization different angle femoral stem forgings of buckling of facilitate the use: the first guide pin and the second guide pin are detachably and fixedly arranged at the bottom of the rear die respectively through a plurality of pairs of mounting holes coaxial with the guide pins; the central connecting lines of each pair of mounting holes are respectively inclined towards the lower right of the cavity to form a plurality of detection lines with different angles.
The detection method of the femoral stem yaw angle visual inspection tool in any technical scheme comprises the following steps:
step one, selecting and assembling a front die and a rear die, namely determining a detection line which inclines towards the lower right of a cavity in the cavity by a first guide pin and a second guide pin which are arranged at the bottoms of the front die and the rear die according to the principle that two points determine a straight line, wherein the deflection angle lambda degrees of the detection line relative to the vertical direction is the same as the deflection angle β degrees of a femoral head relative to a vertical femoral body when a standard forge piece is vertically inserted in the cavity;
step two, a visual inspection tool for the yaw angle of the just-placed femoral stem: visually comparing the horizontal widths of the insertion opening and the exposed opening, enabling one end with the large horizontal width to face upwards and one end with the small horizontal width to face downwards, and holding the correctly placed femoral stem deflection angle visual inspection tool with one hand;
step three, inserting the forging piece to be tested: the forging piece to be tested is held by the other hand, the conical tip of the femoral shaft of the forging piece to be tested is inserted from the top insertion hole of the cavity of the detection tool which is just placed, and the forging piece to be tested slides down to the bottom of the cavity by utilizing the self gravity of the forging piece; the forging piece to be tested with the femoral body conical tip of the forging piece to be tested exposed from the lower part of the exposure opening is a qualified forging piece; the femoral shaft conical tip of the forge piece to be tested can not expose out of the forge piece to be tested, which is clamped in the cavity, from the exposure opening, and the forge piece to be tested is an unqualified forge piece; and the horizontal width of the widest part of the qualified forged piece rotor ridge to be detected is just clamped at the insertion opening at the top end of the cavity.
Compared with the prior art, the invention can realize the following effects:
1. the scheme has small volume; the detection is efficient; the requirement on the processing precision of the front and rear mold cavities is not high; the reliability is excellent; the deflection angle precision detection error is small; the utility model is practical and durable; the technical requirements on the detector are not high; the requirement of large-batch high-efficiency detection can be met;
2. the guide pin can be detachably and fixedly installed at the bottom of the rear die in a wedging mode, a threaded connection mode and the like, the installation positions of the first guide pin and the second guide pin can be adjusted and replaced at any time according to the change of the yaw angle β angle of the forge piece to be detected, so that the yaw angle of the left side detection line 7 in the cavity of the detection tool can be adaptively changed, the adaptability adjustment and replacement detection requirements of one set of die body for different yaw angle standard forge pieces are met, and the detection tool is multipurpose, economical and practical.
Drawings
FIG. 1 is a front view of a standard forging using the inspection device of the present invention in a use state;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a top view of the insertion opening of FIG. 1 according to the present invention;
FIG. 4 is a cross-sectional view B-B of FIG. 3 taken along the line 7 defined by the first and second guide pins at two points;
FIG. 5 is a perspective view of FIG. 1 of the present invention;
FIG. 6 is a schematic diagram of the detection line 7 defined by the first and second guide pins installed at the bottom of the rear mold of FIG. 4;
FIG. 7 is a schematic diagram of a yaw angle detection principle of a standard forging (femoral stem) matched with the rear mold cavity detection principle of FIG. 6;
FIG. 8 is a perspective view of FIG. 5 with only the front and rear molds assembled;
FIG. 9 is a schematic view of a plurality of pairs of first and second guide pin mounting holes formed in a rear mold cavity for forming different inspection lines.
Detailed Description
Specific embodiments of the present invention are described below with reference to fig. 1-9. It is to be understood that the following described embodiments are merely exemplary, and are not intended to limit the invention specifically.
The following examples are given to facilitate a better understanding of the invention, but do not limit the invention. The insertion and placement method and the forging method in the following examples are conventional methods. The members and the materials of the members used in the following examples are commercially available unless otherwise specified.
In the present invention, without going to the contrary, it is understood that: the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are simply for convenience of description of the present invention, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," "disposed," and "provided" are to be construed broadly and can be, for example, fixedly connected, detachably connected, or indirectly connected through other intermediate members. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The femoral stem deflection angle visual inspection tool is characterized by comprising a front die 1 and a rear die 2 which are symmetrically distributed relative to a vertical plane front shaft and a rear shaft (see figures 1, 2 and 8), when a vertical forge piece is arranged from a vertical spindle to be inspected 4, a vertical forge piece 3-7 is formed by using a vertical guide pin 7-7, a vertical straight line of a second insert pin 7-7, a vertical straight line of a vertical right side wall of a cavity 3 of a long channel type forge piece 4 in a cavity 3 is ensured when the vertical straight line of the second insert pin 4-7 is formed by the vertical insert pin 4-7, a vertical insert pin 7-7, a vertical insert pin 4-3 is required to be inserted into a vertical channel insert channel, when a vertical forge piece 3-7 is inserted into a vertical straight line of a second insert pin 4-7, a horizontal insert pin 4-3, a horizontal insert pin 4-3, a horizontal insert pin 4-3, a vertical insert pin 4-3 is formed by means of a vertical insert pin-vertical insert guide pin-insert pin-vertical insert pin-3, a vertical insert guide pin-insert pin-3, a vertical insert pin-vertical insert die-vertical insert die-3, a horizontal guide pin-vertical insert die-vertical insert die-insert pin-insert, a horizontal guide pin-vertical die-4, a horizontal die-vertical die.
In the above embodiment, further: the first guide pin 5 and the second guide pin 6 are respectively detachably and fixedly arranged at the bottom of the rear die 2 through a plurality of pairs of mounting holes 5-1 (shown in figure 9) which are coaxial with the guide pins; the central connecting lines of each pair of mounting holes 5-1 are respectively inclined towards the lower right of the cavity 3 to form a plurality of detection lines 7 with different angles. It should be noted that: a plurality of mounting holes 5-1 shown in fig. 9 correspond to three groups of different angle detection lines 7 respectively; namely, the detection lines 7 corresponding to the degrees of lambda 1 degrees, lambda 2 degrees and lambda 3 degrees respectively, the linear detection line 7 determined by two points of the mounting hole 5-1 of each pair is respectively screwed or wedged with the mounting holes 5-1 corresponding to the required detection line 7 to fixedly mount the first guide pin and the second guide pin (5 and 6). Therefore, the use requirements of batch, efficient and scale-free visual detection on whether the to-be-detected forge piece with the detection line 7 yaw angle femoral head is qualified or not are met. Typically, the yaw angle λ 1 °, λ 2 °, λ 3 ° is between 35 ° and 45 °.
In the above embodiment, further: for the detection that this front and back mould (1, 2) realization different angle femoral stem forgings of buckling of facilitating the use: the detection method of the femoral stem yaw angle visual inspection tool in the embodiment is characterized by comprising the following steps of:
step one, selecting a front die 1 and a rear die 2 and assembling (as shown in figure 6), namely determining a detection line 7 which inclines towards the lower right of a cavity 3 in the cavity 3 by a first guide pin 5 and a second guide pin 6 which are arranged at the bottoms of the front die 1 and the rear die 2 according to the principle that two points determine a straight line, wherein the deflection angle lambda DEG of the detection line 7 relative to the vertical direction is the same as the deflection angle β DEG of a femoral head 4-1 relative to a vertical femoral body 4-2 when a standard forge piece 4 is vertically inserted in the cavity 3, namely selecting a proper detection line 7 according to the deflection angle β DEG of the standard forge piece to assemble the front die (1) and the rear die (2) after the pin is arranged;
step two, a visual inspection tool for the bending linearity of the positive femoral stem (as shown in fig. 8): visually comparing the horizontal widths of the insertion opening 3-1 and the exposure opening 3-2, namely, enabling the insertion opening 3-1 to face upwards at one end with the large horizontal width, enabling the exposure opening 3-2 with the small horizontal width to face downwards, and holding the visual inspection tool for the deflection angle of the femoral stem after being placed by a single hand;
step three, inserting the forging piece to be tested (as shown in figure 5): the forging piece to be tested is held by the other hand, the conical tip of the femoral shaft of the forging piece to be tested is inserted from the top insertion hole 3-1 of the cavity 3 of the testing tool which is just placed, and the forging piece to be tested slides down to the bottom of the cavity 3 by utilizing the self gravity of the forging piece; the forging piece to be tested with the femoral shaft conical tip 4-3 exposed from the lower part of the exposure opening 3-2 is a qualified forging piece (as shown in figure 4); the femoral shaft conical tip 4-3 of the forge piece to be tested can not expose the forge piece to be tested clamped in the cavity from the exposure port 3-2, and the forge piece to be tested is an unqualified forge piece; and the horizontal width of the widest part of the rotor ridge of the qualified forge piece to be detected is just clamped at the insertion opening 3-1 at the top end of the cavity 3 (as shown in figure 4). It should be emphasized that even though a part of the femoral body taper 4-3 of the forging to be tested can be exposed from the exposure port 3-2, the femoral body taper 4-3 can be exposed from the exposure port 3-2, and meanwhile, if the horizontal width of the widest part of the rotor ridge of the forging to be tested is positioned above the insertion port 3-1 at the top end of the cavity 3, the forging to be tested is still unqualified, that is, the forging to be tested is indicated to slide into the cavity, but the yaw angle still has deviation from that of the standard forging. Therefore, the visual judgment of whether the to-be-detected forge piece is a qualified forge piece needs to simultaneously meet two conditions: one condition is that the cone tip 4-3 at the bottom end of the forging to be tested can be exposed out of the exposure opening 3-2; the other condition is that the horizontal width of the widest position of the rotor ridge of the forging to be tested is just clamped at the insertion opening 3-1 at the top end of the cavity 3 (as shown in figure 4). The method is not applicable.
The working principle is that a front die 1 and a rear die 2 are fastened and connected into a whole through hexagon socket head cap screws, an inserting cavity 3 used for detecting whether the deflection angle of a femoral stem forge piece meets requirements is arranged in a die body of the front die 1 and the rear die 2, the inserting cavity 3 guides the vertical insertion of a detection forge piece along a vertical inserting positioning surface 3-3 on the right side of the cavity, a first guide pin 5 and a second guide pin 6 arranged on the left side of the inserting cavity 3 determine a detection line 7 inclined towards the lower right side according to the principle that a straight line is determined by two points, the forge piece to be detected slides into the cavity 3 from an insertion opening 3-1 by depending on the gravity of the forge piece to be detected freely falling body, only a forge piece to be detected with the same deflection angle of β degrees and the detection line 7 deflection angle lambda degree is exposed from the bottom end to an outlet 3-2, only if the horizontal width of the widest part of the forge piece to be detected between the top exposed from the bottom end to be detected is just clamped at the top end of the cavity 3-1, the horizontal width of the forge piece to be detected which is exposed from the bottom end of the standard forge piece, namely, the forge piece is directly observed that the forge piece to be detected is not exposed from the insert opening 3-1, and the forge piece to be detected, if the deflection angle of the forge piece to be detected is not consistent with the deflection angle of the standard forge piece to be detected, the high forge piece to be detected, the forge piece to be detected is.
Compared with the prior art, the detection line is designed to be an unqualified forge piece, compared with a die design with an authorization notice number of CN209197631U, the detection can be finished by visual inspection only if a precision detection tool such as a vernier caliper is adopted to finish detection, the detection efficiency can be greatly improved, the detection line is particularly suitable for the large-batch high-efficiency detection of the β -degree femoral stem forge piece with the deflection angle lambda of the 7, and the deflection angle lambda of the 7 can be adjusted by replacing a first guide pin (5 and a second guide pin (5 and 6) at different mounting positions of the mounting holes 5-1.
The detection tool has the advantages that the detection tool is small in size, efficient in detection, low in machining precision requirement of front and rear die cavities, excellent in reliability, small in deflection angle precision detection error, practical and durable, low in technical requirement on a detector, capable of meeting large-batch high-efficiency detection requirements, and capable of being detachably and fixedly mounted at the bottom of the rear die in a wedging mode, threaded connection mode and the like, the mounting positions of the first and second guide pins 5 and 6 can be adjusted and replaced at any time according to the variation of the deflection angle β angle of the forge piece to be detected, the deflection angle of the detection tool 7 on the left side in the cavity can be changed adaptively, the requirement of adaptively adjusting and replacing the forge piece with different deflection angle standards can be met by one set of die bodies, and the detection tool is multipurpose, economical and practical.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and therefore, all equivalent changes made by the contents of the claims of the present invention should be included in the claims of the present invention.
Claims (3)
1. The femoral stem deflection angle visual inspection tool is characterized by comprising a front die (1) and a rear die (2) which are symmetrically distributed relative to a front axis and a rear axis of a vertical plane, the front die (1) and the rear die (2) are fastened and integrated front and back to form an insertion tool of a vertical long channel penetrating type structure, a vertical insertion cavity (3) which is symmetrical front and back is formed in a die body formed by the front die (1) and the rear die (2), a vertical insertion positioning surface (3-3) is arranged on the right side of the insertion cavity (3), the vertical insertion positioning surface (3-3) is used for vertically righting a forge piece (4) on the right side of the forge piece (4) to ensure that the forge piece (4) is vertically inserted in the cavity (3), the vertical insertion positioning surface (3-3) is matched with the vertical insertion positioning surface (3-3), a first guide pin (5) and a second guide pin (6) are arranged at the bottom of the cavity (3) and are perpendicular to the vertical guide pin (3-2) and perpendicular to the vertical insertion hole (3), the horizontal insertion hole (3-3) is equal to the horizontal insertion tool, when a standard forge piece to-3 forge piece with a standard forge piece, the horizontal angle of a horizontal insertion hole (3-3) is equal to-7 angle, the horizontal angle of a horizontal standard forge piece, the horizontal angle of a horizontal forge piece is equal to-3-7 angle horizontal angle of a horizontal angle of a horizontal angle of a horizontal angle of a horizontal angle of a horizontal forge piece, the horizontal angle of a horizontal angle horizontal forge piece is equal to be detected vertical forge piece, the horizontal angle of a horizontal.
2. The femoral stem yaw angle visual inspection tool of claim 1, wherein: the first guide pin (5) and the second guide pin (6) are detachably and fixedly arranged at the bottom of the rear die (2) of the cavity (3) through a plurality of pairs of mounting holes (5-1) which are coaxial with the guide pins respectively; the central connecting lines of each pair of mounting holes (5-1) are respectively inclined towards the lower right of the cavity (3) to form a plurality of detection lines (7) with different angles.
3. The detection method using the femoral stem yaw angle visual inspection tool according to claim 1 or 2, characterized by comprising the steps of:
step one, selecting and assembling a front die (1) and a rear die (2), namely determining a detection line (7) which inclines towards the lower right of a cavity (3) in the cavity (3) by a first guide pin (5) and a second guide pin (6) which are arranged at the bottoms of the front die (1) and the rear die (2) according to the principle that two points determine a straight line, wherein the yaw angle lambda DEG of the detection line (7) relative to the vertical direction is the same as the yaw angle β DEG of a femoral head (4-1) relative to a vertical femoral body (4-2) when a standard forge piece (4) is vertically inserted in the cavity (3);
step two, a visual inspection tool for the yaw angle of the just-placed femoral stem: the horizontal widths of the insertion opening (3-1) and the exposure opening (3-2) are compared visually, one end with the large horizontal width faces upwards, the other end with the small horizontal width faces downwards, and the femoral stem deflection angle visual inspection tool after being placed in a holding mode is held by one hand;
step three, inserting the forging piece to be tested: the forging piece to be tested is held by the other hand, the conical tip of the femoral shaft of the forging piece to be tested is inserted from the top insertion hole (3-1) of the cavity (3) of the testing tool which is just placed, and the forging piece to be tested slides to the bottom of the cavity (3) by utilizing the self gravity of the forging piece to fall freely; the forging piece to be tested, which is exposed from the lower part of the exposure port (3-2) by the femoral body conical tip (4-3) of the forging piece to be tested, is a qualified forging piece; the femoral shaft conical tip (4-3) of the forge piece to be tested can not expose the forge piece to be tested clamped in the cavity from the exposure opening (3-2) and is an unqualified forge piece; and the horizontal width of the widest part of the qualified forging rotor ridge to be detected is just clamped at the insertion opening (3-1) at the top end of the cavity (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010145708.1A CN111189372A (en) | 2020-03-05 | 2020-03-05 | Femoral stem deflection angle visual inspection tool and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010145708.1A CN111189372A (en) | 2020-03-05 | 2020-03-05 | Femoral stem deflection angle visual inspection tool and detection method thereof |
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| Publication Number | Publication Date |
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| CN111189372A true CN111189372A (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010145708.1A Pending CN111189372A (en) | 2020-03-05 | 2020-03-05 | Femoral stem deflection angle visual inspection tool and detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780649A (en) * | 2020-07-28 | 2020-10-16 | 北京地铁车辆装备有限公司 | Taper measuring tool |
-
2020
- 2020-03-05 CN CN202010145708.1A patent/CN111189372A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780649A (en) * | 2020-07-28 | 2020-10-16 | 北京地铁车辆装备有限公司 | Taper measuring tool |
| CN111780649B (en) * | 2020-07-28 | 2021-12-14 | 北京地铁车辆装备有限公司 | Taper measuring tool |
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