CN216283207U - Taper hole measuring device - Google Patents

Taper hole measuring device Download PDF

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Publication number
CN216283207U
CN216283207U CN202123064950.5U CN202123064950U CN216283207U CN 216283207 U CN216283207 U CN 216283207U CN 202123064950 U CN202123064950 U CN 202123064950U CN 216283207 U CN216283207 U CN 216283207U
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Prior art keywords
measuring ring
taper hole
outer cylinder
measuring
positioning
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CN202123064950.5U
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Inventor
程永亮
何其平
许正根
徐望荣
张思颖
吴双
王婷
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China Railway Construction Heavy Industry Group Co Ltd
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China Railway Construction Heavy Industry Group Co Ltd
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Abstract

The utility model provides a taper hole measuring device. Comprises an outer cylinder, a core rod and a positioning mechanism which are coaxially arranged; one end of the outer cylinder is provided with a first measuring ring; the core bar is arranged in the outer cylinder in a sliding manner; one end of the core bar close to the first measuring ring is provided with a second measuring ring; the other end of the core rod penetrates through the outer cylinder; the positioning mechanism is slidably sleeved outside the outer barrel, and the bottom surface of the positioning mechanism is parallel to the bottom surfaces of the first measuring ring and the second measuring ring. The taper measuring device can be simultaneously suitable for taper measurement of taper holes with through holes and blind holes, and the axes of the outer cylinder and the core rod can be superposed with the axis of the taper hole to be measured by coaxially arranging the positioning mechanism and the outer cylinder, so that the measurement error of the taper hole is reduced.

Description

Taper hole measuring device
Technical Field
The utility model relates to the technical field of detection measuring tools, in particular to a taper hole measuring device.
Background
At present, machine tool spindle tool holder mounting holes, pin shaft holes and the like on the market all have the characteristics of taper fitting surfaces, quality testing personnel generally use standard taper plug gauges to combine with oil sludge when detecting whether the taper of a taper hole is qualified, whether the taper of the taper hole is qualified is judged by observing the coverage rate of the oil sludge on the surfaces of the plug gauges, and the taper of the taper hole is detected by using the taper plug gauges, so that the defects that:
firstly, the taper plug gauge can only be used for detecting a through-hole type inner taper hole, and cannot perform plug-in detection on a blind-hole type taper hole, so that the universality is poor;
secondly, the detection requires that an operator has certain detection experience, and once the axis of the taper plug gauge and the axis of the taper hole are inclined, the inclined and dead-locked phenomenon at the matching part of the plug gauge and the taper hole can occur, so that the plug gauge is difficult to pull out, and the measuring precision of the taper hole is difficult to ensure;
and thirdly, the plug gauge is generally a solid conical rod, and when the taper of a conical hole with a larger diameter needs to be measured, the plug gauge is heavy and difficult to move.
In view of the above, there is a need for a taper hole measuring device to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a taper hole measuring device, which aims to solve the problems of poor universality and low measuring precision of the existing taper hole measuring device.
In order to achieve the aim, the utility model provides a taper hole measuring device which comprises an outer cylinder, a core rod and a positioning mechanism, wherein the outer cylinder, the core rod and the positioning mechanism are coaxially arranged; one end of the outer cylinder is provided with a first measuring ring; the core bar is arranged in the outer cylinder in a sliding manner; a second measuring ring is arranged at one end, close to the first measuring ring, of the core rod, and the diameter of the first measuring ring is larger than that of the second measuring ring; the other end of the core rod penetrates through the outer cylinder; the positioning mechanism is slidably sleeved outside the outer barrel, and the bottom surface of the positioning mechanism is parallel to the bottom surfaces of the first measuring ring and the second measuring ring.
Preferably, the bottom of the first measuring ring is provided with a receiving groove for receiving the second measuring ring, so that the bottom surfaces of the first measuring ring and the second measuring ring are coplanar when the second measuring ring is positioned in the receiving groove.
Preferably, the taper hole measuring device further comprises a rotating sleeve, and the rotating sleeve is rotatably connected with one end, far away from the first measuring ring, of the outer cylinder; the core bar penetrates through the rotating sleeve, external threads are arranged on the core bar, and internal threads matched with the core bar are arranged on the inner wall of the rotating sleeve.
Preferably, an annular groove is formed in the outer cylinder, and a first limiting part matched with the annular groove is arranged on the rotating sleeve.
Preferably, the outer wall of the core bar is provided with a sliding groove extending along the axis direction, and the outer cylinder is provided with a second limiting part matched with the sliding groove.
Preferably, the positioning mechanism comprises a positioning cylinder and a plurality of positioning claws arranged along the circumferential direction of the positioning cylinder; the positioning cylinder is sleeved outside the outer cylinder, and the bottom surface formed at the bottom of the plurality of positioning claws is parallel to the bottom surface of the first measuring ring.
Preferably, the taper hole measuring device further comprises an elastic assembly, the elastic assembly is arranged on the outer cylinder, one end of the elastic assembly abuts against or is connected to the end face of the positioning cylinder, and when the elastic assembly is in an initial state, the bottom face formed by the bottoms of the positioning claws and the bottom face of the first measuring ring are coplanar.
Preferably, the elastic component comprises a fixing nut and an elastic piece; the fixing nut is arranged on the outer wall of the outer barrel, and the elastic piece is positioned between the fixing nut and the positioning barrel; the outer barrel is provided with a limiting boss at one end of the positioning barrel far away from the elastic part.
The technical scheme of the utility model has the following beneficial effects:
(1) according to the taper hole taper measuring device, the first measuring ring and the second measuring ring are respectively arranged on the outer cylinder and the core rod which are coaxially arranged, the first measuring ring and the second measuring ring are placed in the taper hole, the two measuring rings are in contact with the inner wall of the taper hole to measure the taper of the taper hole, the taper hole taper measuring device is suitable for taper measurement of through hole type taper holes and blind hole type taper holes, the positioning mechanism and the outer cylinder are coaxially arranged, the bottom surface of the positioning mechanism is parallel to the bottom surfaces of the first measuring ring and the second measuring ring, the bottom surface of the positioning mechanism can be guaranteed to be arranged on the plane of the large end of the taper hole, the axis of the outer cylinder and the core rod is overlapped with the axis of the taper hole to be measured, the measuring error of the taper hole is reduced, the precision of taper hole taper measurement is guaranteed, and the taper hole measuring device is prevented from being deflected and being clamped in the taper hole.
(2) In the utility model, the bottom of the first measuring ring is provided with an accommodating groove for accommodating the second measuring ring, so that the bottom surfaces of the first measuring ring and the second measuring ring are coplanar when the second measuring ring is positioned in the accommodating groove; on one hand, the structure of the device is convenient to reduce, and the space occupancy rate of the device during storage is reduced; on the other hand, when the taper hole is measured, the height position variation generated between the first measuring ring and the second measuring ring can be calculated by measuring the height position variation of the top end of the core rod and the top end of the outer cylinder, so that the detection efficiency is convenient to improve.
(3) According to the utility model, the outer cylinder is provided with the rotating sleeve, the inner wall of the rotating sleeve is provided with the internal thread matched with the core rod, and when the rotating sleeve is rotated, the height position of the core rod is adjusted through changing the thread matching position of the rotating sleeve and the core rod, so that the height position of the second measuring ring is changed, and the lowering and the withdrawing of the second measuring ring are realized.
(4) According to the utility model, the outer cylinder and the rotating sleeve realize relative rotation through the matching of the annular groove and the first limiting piece, the outer wall of the core rod is provided with a sliding groove extending along the axis direction, and the outer cylinder is provided with a second limiting piece matched with the sliding groove, so that the core rod is prevented from rotating in the outer cylinder when the rotating sleeve is rotated; the first locating part and the second locating part are detachably connected, and therefore disassembly and assembly of the taper hole measuring device are facilitated.
(5) According to the taper hole measuring device, the positioning mechanism comprises the positioning cylinder and the plurality of positioning claws arranged along the circumferential direction of the positioning cylinder, and bottom surfaces (namely planes determined by the claw tips) formed at the bottoms of the plurality of positioning claws are parallel to the bottom surface of the first measuring ring, so that when the taper hole is measured, the positioning claws are supported on the plane where the large end of the taper hole is located, and the axes of the outer cylinder and the core rod are ensured to be coincident with the axis of the taper hole to be measured.
(6) According to the utility model, one end of the elastic component is abutted against or connected to the end face of the positioning cylinder, so that the bottom surfaces formed by the bottoms of the positioning claws and the bottom surface of the first measuring ring are coplanar when the elastic component is in an initial state, and the diameter of the large end of the taper hole can be conveniently calculated by measuring the height position change between the positioning cylinder and the outer cylinder.
(7) In the utility model, the elastic component comprises a fixed nut and an elastic piece; the fixing nut is arranged on the outer wall of the outer barrel, the elastic piece is positioned between the fixing nut and the positioning barrel, and the positioning mechanism automatically restores to the original position after the measurement is finished through the elasticity of the elastic piece; the outer cylinder is provided with a limiting boss at one end of the positioning cylinder far away from the elastic part, and the limiting boss is used for being combined with the elastic part to limit the positioning cylinder.
(8) According to the taper hole measuring method, the bottom surface of the first measuring ring is in contact with the inner wall of the taper hole by pressing down the outer cylinder in a handheld mode, then the rotating sleeve is rotated, the second measuring ring is placed downwards until the bottom surface of the second measuring ring is in contact with the inner wall of the taper hole, the height difference between the top end surface of the core rod and the top end surface of the rotating sleeve is measured through the vernier caliper, the height position variation of the positioning mechanism relative to the outer cylinder is measured, the taper of the taper hole can be calculated by measuring the diameter of two radial sections of the taper hole and the distance between the two radial sections, then the distance between one radial section and the plane where the large end of the taper hole is located is measured, the large circle diameter of the large end of the taper hole is calculated, and the detection efficiency of the taper hole is improved. Whole device structure is light, is convenient for carry out hand-held type and measures, and measurement accuracy is high moreover, can measure the measuring point through slide caliper, and measurement accuracy can reach 0.01.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic structural diagram of a taper hole measuring apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of the outer barrel in the embodiment of the present application in FIG. 1;
FIG. 3 is a schematic structural diagram of the core rod of FIG. 1 in the embodiment of the present application;
FIG. 4 is a schematic structural diagram of the positioning mechanism in FIG. 1 according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a taper hole measurement method in an embodiment of the present application;
wherein, 1, urceolus, 1.1, first measuring ring, 1.2, holding tank, 1.3, ring channel, 1.4, locating part two, 1.5, spacing boss, 2, the core bar, 2.1, second measuring ring, 2.2, spout, 3, positioning mechanism, 3.1, a location section of thick bamboo, 3.2, the locating pawl, 4, rotatory sleeve, 4.1, locating part one, 5, elastic component, 5.1, fixation nut, 5.2, elastic component.
Detailed Description
Embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways, which are defined and covered by the claims.
Example (b):
referring to fig. 1 to 5, the present embodiment is applied to measurement and calculation of taper of a taper hole and a diameter of a large end of the taper hole.
A taper hole measuring device, see figure 1, includes the outer cylinder 1, core bar 2 and locating mechanism 3 that set up coaxially; one end of the outer cylinder 1 is provided with a first measuring ring 1.1; the core bar 2 is arranged inside the outer cylinder 1 in a sliding manner; a second measuring ring 2.1 is arranged at one end, close to the first measuring ring 1.1, of the core rod 2, the diameter of the first measuring ring 1.1 is larger than that of the second measuring ring 2.1, and in the embodiment, the first measuring ring 1.1 and the second measuring ring 2.1 are both in a circular truncated cone-shaped structure; the other end of the core bar 2 penetrates through the outer cylinder 1; the outer cylinder 1 is sleeved with the positioning mechanism 3 in a sliding mode, the bottom surface of the positioning mechanism 3 is parallel to the bottom surface of the first measuring ring 1.1 and the bottom surface of the second measuring ring 2.1, when taper hole measurement is carried out, the bottom surface of the positioning mechanism 3 is arranged on a plane where a large end of a taper hole is located, the fact that the axis of the core rod 2 and the axis of the outer cylinder 1 are perpendicular to the plane where the large end of the taper hole is located is guaranteed (namely, the fact that the axis of the core rod 2 and the axis of the outer cylinder 1 coincide with the axis of the taper hole to be measured is guaranteed), and taper hole measurement errors are reduced.
Referring to fig. 2, the bottom of the first measuring ring 1.1 is provided with an accommodating groove 1.2 for accommodating the second measuring ring 2.1, so that the bottom surfaces of the first measuring ring 1.1 and the second measuring ring 2.1 are coplanar when the second measuring ring 2.1 is located in the accommodating groove 1.2; on one hand, the second measuring ring 2.1 is accommodated at the bottom of the first measuring ring 1.1, so that the structure of the device is reduced, and the space occupancy rate of the device during storage is reduced; on the other hand, when the bottom surfaces of the first measuring ring 1.1 and the second measuring ring 2.1 are coplanar, the height position variation generated when the first measuring ring 1.1 and the second measuring ring 2.1 perform taper hole measurement can be obtained by measuring the height position variation of the top end of the core rod 2 and the top end of the outer cylinder 1.
The taper hole measuring device further comprises a rotating sleeve 4, wherein the rotating sleeve 4 is rotatably connected with one end (namely the top end in the figure 1) of the outer cylinder 1 far away from the first measuring ring 1.1; the core rod 2 penetrates through the rotating sleeve 4, an external thread is arranged on the core rod 2, an internal thread matched with the core rod 2 is arranged on the inner wall of the rotating sleeve 4, and when the rotating sleeve 4 is rotated, the height position of the core rod 2 is adjusted through the change of the thread matching position of the rotating sleeve 4 and the core rod 2, so that the height position of the second measuring ring 2.1 is changed, and the second measuring ring 2.1 is lowered and retracted.
Referring to fig. 1 and 2, in this embodiment, an annular groove 1.3 is formed in the outer cylinder 1, a first limiting member 4.1 matched with the annular groove 1.3 is formed in the rotating sleeve 4, and when the rotating sleeve 4 is rotated, the first limiting member 4.1 slides in the annular groove 1.3; the first limiting part 4.1 is a first screw detachably connected with the body of the rotating sleeve 4, and the first screw is inserted into the annular groove 1.3 to slide along the annular groove 1.3.
Referring to fig. 3, the outer wall of the core bar 2 is provided with a sliding groove 2.2 extending along the axial direction, and the outer cylinder 1 is provided with a second limiting member 1.4 matched with the sliding groove 2.2, so that when the rotating sleeve 4 is rotated, the core bar 2 rotates inside the outer cylinder 1, and the adjustment of the height position of the second measuring ring 2.1 cannot be effectively realized. In this embodiment, the second limiting member 1.4 is a second screw detachably connected to the outer barrel 1, and the second screw is inserted into the sliding groove 2.2, so that the core rod 2 can only move in the vertical direction, and circumferential rotation cannot occur.
Referring to fig. 4, the positioning mechanism 3 includes a positioning cylinder 3.1 and a plurality of positioning claws 3.2 arranged along the circumferential direction of the positioning cylinder 3.1; the outer cylinder 1 is sleeved with the positioning cylinder 3.1, the bottom surfaces (namely planes determined by the claw tips) formed at the bottoms of the positioning claws 3.2 are parallel to the bottom surface of the first measuring ring 1.1, and the area surrounded by the claw tips of the positioning claws 3.2 is larger than the circular area of the large end of the taper hole, so that when the taper hole is measured, the positioning claws 3.2 are supported on the plane where the large end of the taper hole is located, and the coincidence of the axes of the outer cylinder 1 and the core rod 2 and the axis of the taper hole to be measured is ensured.
The utility model provides a taper hole measuring device still includes elastic component 5, elastic component 5 locates on the urceolus 1, elastic component 5's one end is supported and is leaned on or connect on the terminal surface of a location section of thick bamboo 3.1, and it is a plurality of when making elastic component 5 be in initial condition the bottom surface that the locating pawl 3.2 bottom formed with the bottom surface coplane of first measuring ring 1.1 is convenient for calculate the diameter of taper hole main aspects through measuring a location section of thick bamboo 3.1 and urceolus 1 between the high position change.
The elastic component 5 comprises a fixing nut 5.1 and an elastic piece 5.2; the fixing nut 5.1 is installed on the outer wall of the outer barrel 1 in a threaded connection mode, and the elastic piece 52, the positioning mechanism 3 is positioned between the fixing nut 5.1 and the positioning cylinder 3.1, and automatically restores to the original position after the measurement is finished through the elasticity of the elastic piece 5.2; the outer cylinder 1 is provided with a limiting boss 1.5 at one end of the positioning cylinder 3.1 far away from the elastic part 5.2, and is used for limiting the positioning cylinder 3.1 by combining with the elastic part 5.2. In the embodiment, the elastic part 5.2 is a spring, and in an initial state, the spring applies pressure to the positioning cylinder 3.1 to enable the end face of the bottom of the positioning cylinder 3.1 to abut against the limiting boss 1.5, and the bottom surface formed by the bottoms of the positioning claws 3.2 is coplanar with the bottom surface of the first measuring ring 1.1; during measurement, the outer cylinder 1 is pressed downwards, the plane where the large end of the taper hole is located applies upward supporting force to the positioning claw 3.2, the positioning cylinder 3.1 overcomes the elastic force of the spring and moves relative to the outer cylinder 1 in the vertical direction, and the height position variation delta H between the end face of the positioning cylinder 3.1 and the limiting boss 1.5 is measured2The distance between the bottom surface of the first measuring ring 1.1 and the plane where the big end of the taper hole is located can be calculated.
A taper hole measuring method, referring to fig. 5, using the taper hole measuring apparatus, comprising the steps of:
step A: arranging the bottom of the positioning mechanism 3 on a plane where the large end of the taper hole to be measured is located, placing a first measuring ring 1.1 and a second measuring ring 2.1 into the taper hole, holding the outer barrel 1 by hand and pressing downwards with force to enable the bottom surface of the first measuring ring 1.1 to be in contact with the inner wall of the taper hole, then rotating the rotating sleeve 4 and putting the second measuring ring 2.1 downwards until the bottom surface of the second measuring ring 2.1 is in contact with the inner wall of the taper hole;
and B: measuring and calculating the height position variation between the core rod 2 and the outer cylinder 1, measuring and calculating the height position variation of the positioning mechanism 3 relative to the outer cylinder 1, and calculating the taper of the taper hole and the diameter of the large end of the taper hole;
the height position variation between the core rod 2 and the outer cylinder 1 can be obtained by a method that, in an initial state, if the original height difference between the bottom surface of the first measuring ring 1.1 and the bottom surface of the second measuring ring 2.1 is L, the original height difference between the top end surface of the core rod 2 and the top end surface of the rotating sleeve 4 is H, and the height difference between the top end surface of the core rod 2 and the top end surface of the rotating sleeve 4 is H when a vernier caliper is used for measuring the measuring state1At this time, between the core bar 2 and the outer cylinder 1Height position variation amount Δ H of1=H-h1
In the measuring state, the amount of change Δ H in the height position of the positioning mechanism 3 with respect to the outer cylinder 12The height variation between the limiting boss 1.5 and the positioning cylinder 3.1 can be measured by a vernier caliper, if the original height difference between the bottom surface of the first measuring ring 1.1 and the bottom surface of the positioning mechanism 3 is W in the initial state, the height difference h between the plane where the large end of the taper hole is located and the bottom surface of the first measuring ring 1.12=ΔH2-W; the taper Z of the taper hole and the diameter D of the large end of the taper hole can be calculated by expression 1):
Figure BDA0003399007850000061
wherein d is1Is the diameter of the bottom surface of the first measuring ring 1.1, d2In order to measure the diameter of the bottom surface of the second measuring ring 2.1, which is a known parameter, in the present embodiment, referring to fig. 5, since the bottom surface of the first measuring ring 1.1, the bottom surface of the second measuring ring 2.1 and the bottom surface of the positioning mechanism 3 are coplanar in the initial state, L ═ W ═ 0, and the original height difference between the top end surface of the core rod 2 and the top end surface of the rotating sleeve 4 is H, only H needs to be measured1And Δ H2The taper Z of the taper hole and the diameter D of the big end of the taper hole can be obtained.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A taper hole measuring device is characterized by comprising an outer cylinder (1), a core rod (2) and a positioning mechanism (3) which are coaxially arranged; one end of the outer cylinder (1) is provided with a first measuring ring (1.1); the core bar (2) is arranged in the outer cylinder (1) in a sliding manner; a second measuring ring (2.1) is arranged at one end, close to the first measuring ring (1.1), of the core rod (2), and the diameter of the first measuring ring (1.1) is larger than that of the second measuring ring (2.1); the other end of the core rod (2) penetrates through the outer cylinder (1) to be arranged; the positioning mechanism (3) is slidably sleeved outside the outer barrel (1), and the bottom surface of the positioning mechanism (3) is parallel to the bottom surface of the first measuring ring (1.1) and the bottom surface of the second measuring ring (2.1).
2. A taper hole measuring device according to claim 1, characterized in that the bottom of the first measuring ring (1.1) is provided with a receiving groove (1.2) for receiving the second measuring ring (2.1), such that the bottom surfaces of the first measuring ring (1.1) and the second measuring ring (2.1) are coplanar when the second measuring ring (2.1) is located in the receiving groove (1.2).
3. A taper hole measuring device according to claim 1 or 2, further comprising a rotating sleeve (4), wherein the rotating sleeve (4) is rotatably connected with one end of the outer cylinder (1) far away from the first measuring ring (1.1); the core rod (2) penetrates through the rotating sleeve (4) to be arranged, external threads are arranged on the core rod (2), and internal threads matched with the core rod (2) are arranged on the inner wall of the rotating sleeve (4).
4. A taper hole measuring device according to claim 3, wherein said outer cylinder (1) is provided with an annular groove (1.3), and said rotating sleeve (4) is provided with a first retaining member (4.1) engaged with said annular groove (1.3).
5. The taper hole measuring device according to claim 4, wherein a sliding groove (2.2) extending along the axial direction is provided on the outer wall of the core rod (2), and a second limiting member (1.4) engaged with the sliding groove (2.2) is provided on the outer cylinder (1).
6. The taper hole measuring device according to claim 1, wherein said positioning mechanism (3) comprises a positioning cylinder (3.1) and a plurality of positioning claws (3.2) arranged along the circumference of the positioning cylinder (3.1); the positioning cylinder (3.1) is sleeved outside the outer cylinder (1), and the bottom surface formed at the bottom of the positioning claws (3.2) is parallel to the bottom surface of the first measuring ring (1.1).
7. The taper hole measuring device according to claim 6, further comprising an elastic component (5), wherein the elastic component (5) is disposed on the outer cylinder (1), and one end of the elastic component (5) abuts against or is connected to the end surface of the positioning cylinder (3.1), so that the bottom surface formed by the bottoms of the positioning claws (3.2) is coplanar with the bottom surface of the first measuring ring (1.1) when the elastic component (5) is in the initial state.
8. A taper hole measuring device according to claim 7, wherein said elastic member (5) comprises a fixing nut (5.1) and an elastic member (5.2); the fixing nut (5.1) is installed on the outer wall of the outer cylinder (1), and the elastic piece (5.2) is located between the fixing nut (5.1) and the positioning cylinder (3.1); and a limiting boss (1.5) is arranged at one end, far away from the elastic piece (5.2), of the positioning cylinder (3.1) of the outer cylinder (1).
CN202123064950.5U 2021-12-08 2021-12-08 Taper hole measuring device Active CN216283207U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123064950.5U CN216283207U (en) 2021-12-08 2021-12-08 Taper hole measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123064950.5U CN216283207U (en) 2021-12-08 2021-12-08 Taper hole measuring device

Publications (1)

Publication Number Publication Date
CN216283207U true CN216283207U (en) 2022-04-12

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