CN216283174U - Measuring calipers for ring groove in hole - Google Patents

Abstract

The utility model provides a caliper for measuring an annular groove in a hole, which comprises: connecting components, first card foot, second card foot, dial and locating component. The coupling assembling includes: the connecting plate, circular post and square post, and circular post and square post set up respectively on the top surface and the bottom surface of connecting plate. The first clamping foot is arranged on the square hole, and the second clamping foot is arranged on the circular hole. The indicating dial is arranged on the top surface of the second clamping pin, and an arc indicating notch is formed in the indicating dial. The positioning assembly comprises: casing, bolt and spring, the casing sets up on the connecting plate, is equipped with the accommodation hole on the casing, the bolt sets up inside the accommodation hole, when the arc instructs incision and accommodation hole relative timing, inside the arc instructs the incision is inserted to the bolt top. The caliper for measuring the annular groove in the hole can improve the measuring efficiency of the annular groove in the hole and is convenient for workers to operate.

Description

Measuring calipers for ring groove in hole

Technical Field

The utility model belongs to the field of detection equipment, and particularly relates to a caliper for measuring an annular groove in a hole.

Background

The fuel injection pump is an important component on the diesel engine, and when the fuel injection pump works, the fuel injection pump can pressurize low-pressure fuel through parts such as a plunger and barrel assembly and the like, and quantitatively and regularly convey the diesel fuel into the diesel engine, so that power is provided for the diesel engine. The common fuel injection pump is internally provided with an overflow valve, and when the pressure of the system is increased, the overflow valve can enable redundant diesel to overflow back to the fuel tank, so that system accidents are avoided.

All be equipped with the annular in current overflow valve hole inside, can provide installation space for O type sealing washer through the annular to promote the sealed effect of overflow valve. After the machining of the overflow valve is completed, the worker needs to measure the parameters of the annular groove in the hole, so that the parameters of the annular groove are ensured to meet the actual use requirements.

However, the use convenience of the existing measuring device for the ring groove in the hole is poor, and when the measuring device is used for measuring, a worker needs to frequently read the ring groove to judge the qualified condition of the ring groove, so that the measuring efficiency of the ring groove in the hole can be seriously influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a caliper for measuring an annular groove in a hole, so as to improve the efficiency of measuring the annular groove in the hole.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a measuring caliper of an annular groove in a bore, comprising:

a connection assembly, the connection assembly comprising: the connecting plate comprises a connecting plate, a round column and a square column, wherein the round column is vertically arranged on the top surface of the connecting plate, the square column is vertically arranged on the bottom surface of the connecting plate, and the square column is aligned with the round column;

the device comprises a first clamping pin, a second clamping pin and a third clamping pin, wherein one end of the first clamping pin is provided with a first detection clamping jaw, and the other end of the first clamping pin is provided with a first holding handle; a connecting groove for accommodating the connecting plate is arranged on the top surface of the first clamping foot, a square hole is arranged on the bottom surface of the connecting groove, and the square column is inserted into the square hole;

one end of the second clamping pin is provided with a second detection clamping jaw, and the other end of the second clamping pin is provided with a second holding handle; a circular hole for accommodating the circular column is formed in the second clamping leg, and the circular column can be rotatably inserted into the circular hole;

the indicating disc is arranged on the top surface of the second clamping pin, an arc indicating notch is formed in the indicating disc, and the circle center of the arc indicating notch is overlapped with the circle center of the end surface of the top of the circular column;

a positioning assembly, the positioning assembly comprising: the shell is arranged on the connecting plate, and the shell is provided with an accommodating hole; the plug pin is arranged in the accommodating hole, and a blocking piece is arranged on the plug pin; the spring sleeve is arranged on the plug pin, the top end of the spring is connected with the blocking piece, the bottom end of the spring is connected with the inner portion of the bottom of the shell, when the arc-shaped indication notch is opposite to the accommodating hole in right time, the top end of the plug pin is inserted into the arc-shaped indication notch.

Further, the arc-shaped indication notch comprises a first containing section and a second containing section, and the inner diameter of the second containing section is larger than that of the first containing section; the bolt comprises a first inserting section and a second inserting section, wherein the first inserting section is positioned at the top of the second inserting section, the outer diameter of the first inserting section is equal to the inner diameter of the first accommodating section, and the outer diameter of the second inserting section is equal to the inner diameter of the second accommodating section.

Further, the number of the arc-shaped indicating cuts is at least two, and the lengths of the first accommodating sections of any two arc-shaped indicating cuts are different.

Furthermore, a plurality of first positioning holes are formed in the top surface of the second clamping corner, and are annularly arranged on the periphery of the circular hole; and when the second positioning hole is opposite to the first positioning hole in right time, the positioning bolt is inserted into the first positioning hole.

Furthermore, a first limiting bolt is arranged on the bottom end face of the square column, and a screw head of the first limiting bolt is abutted against the bottom face of the first clamping pin; the top end face of the circular column is provided with a second limiting bolt, the top face of the second clamping foot is provided with an avoiding groove, and the screw head of the second limiting bolt is abutted to the bottom face of the avoiding groove.

Furthermore, be equipped with the scale mark on the lateral wall of instruction dish, it is corresponding be equipped with the instruction strip on the lateral wall of casing, the length direction of instructing the strip is parallel with the axis direction of accommodation hole.

Furthermore, an operation block is arranged below the shell, and the bottom end of the plug pin is connected with the operation block.

Further, be equipped with the torsional spring on the circular post, the one end of torsional spring links to each other with first card foot, and the other end links to each other with the second card foot.

Compared with the prior art, the caliper for measuring the annular groove in the hole has the following advantages:

(1) according to the caliper for measuring the annular groove in the hole, the second clamping pin is provided with the indicating disc, when the annular groove in the hole is measured, the second clamping pin and the first clamping pin rotate relatively, and the indicating disc rotates along with the second clamping pin. The staff can be according to the mounted position of the parameter adjustment indicating dial of predetermineeing of downthehole annular to make the bolt insert the arc when downthehole annular parameter is qualified and instruct the incision inside, thereby detect the qualified circumstances of downthehole annular fast.

(2) The utility model relates to a measuring caliper for an annular groove in a hole, which is characterized in that an arc indicating notch comprises a first accommodating section and a second accommodating section, and correspondingly, a bolt comprises a first inserting section and a second inserting section. When the inner diameter of the ring groove to be detected is smaller than the qualified interval, the plug pin cannot enter the arc-shaped indicating notch; when the inner diameter of the ring groove to be detected is in a qualified interval, the first inserting section enters the first accommodating section; when the inner diameter of the ring groove to be measured is larger than the qualified interval, the second inserting section enters the second accommodating section. The staff can be based on the actual inserted position of bolt and the depth of insertion is appraised the qualification condition of annular fast to the measurement of downthehole annular is accelerated.

(3) According to the measuring caliper for the ring grooves in the holes, the second clamping leg is provided with the first positioning holes, and before measurement, workers can adjust the installation position of the indicating disc according to actual conditions, so that the ring grooves in the holes with different inner diameters can be conveniently detected. In addition, this device is equipped with two at least arcs on the dial and indicates the incision, and arbitrary two arcs indicate the notched first length of holding different, and the staff can select the length of first section of holding according to the tolerance condition allowed of the annular that awaits measuring to promote this device to the adaptability of different measurement demands.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment 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 measuring caliper according to an embodiment of the present invention;

FIG. 2 is an exploded view of a measuring caliper according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a measuring caliper according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a connecting assembly and a positioning assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a first clip according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a second clip according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an indicator panel according to an embodiment of the present invention.

Description of reference numerals:

1-connecting plate; 11-circular column; 12-square column; 21-a first detection jaw; 22-a first gripping handle; 23-connecting grooves; 24-square holes; 31-a second detection jaw; 32-a second grip handle; 33-circular holes; 331-avoiding a slot; 34-a first positioning hole; 4-an indicator panel; 41-arc indicating incision; 411 — first containment section; 412-a second containment section; 42-a second positioning hole; 421-positioning bolt; 43-graduation mark; 51-a housing; 511-a receiving hole; 512-indicator bar; 52-a latch; 521-a first insertion section; 522-a second insertion section; 523-blocking sheet; 524-operation block; 53-a spring; 61-a first stop bolt; 62-a second stop bolt; 7-torsion spring.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A measuring caliper for measuring a groove in a hole, the structure of which can be schematically shown in fig. 1-7, wherein the measuring caliper in this embodiment comprises: connecting components, first card foot, second card foot, dial 4 and locating component. Wherein first card foot, second card foot and locating component all set up on coupling assembling, and indicator panel 4 sets up on the second card foot, and when measuring, indicator panel 4 can follow the second card foot and rotate, can judge the qualified circumstances of downthehole annular groove fast through locating component and indicator panel 4's cooperation to improve the measurement of downthehole annular groove efficiency.

Specifically, as shown in fig. 2, the connection assembly includes: connecting plate 1, circular post 11 and square post 12, wherein circular post 11 sets up perpendicularly on the top surface of connecting plate 1, and square post 12 sets up perpendicularly on the bottom surface of connecting plate 1, and square post 12 is just relative with circular post 11.

One end of the first clamping leg is provided with a first detection clamping jaw 21, the other end of the first clamping leg is provided with a first holding handle 22, the top surface of the first clamping leg is further provided with a connecting groove 23, and the bottom surface of the connecting groove 23 is provided with a square hole 24. When the installation is carried out, the first clamping foot is installed on the bottom surface of the connecting plate 1, the connecting plate 1 is embedded into the connecting groove 23, and the square column 12 is inserted into the square hole 24. The first card foot can be carried out circumference spacing through square post 12 and square hole 24's cooperation to avoid taking place relative rotation between first card foot and the coupling assembling.

One end of the second clamping foot is provided with a second detection clamping jaw 31, the other end of the second clamping foot is provided with a second holding handle 32, and a circular hole 33 is formed in the second clamping foot. When the installation is carried out, the second clamping foot is installed on the top surface of the connecting plate 1, and the circular column 11 is rotatably inserted into the circular hole 33.

Optionally, for avoiding first card foot and the separation of second card foot and coupling assembling, all can be equipped with spacing plane on the terminal surface of square post 12 and circular post 11. Correspondingly, in order to facilitate the disassembly and replacement of the first clamping leg and the second clamping leg, the first limiting bolt 61 can be further installed on the bottom end face of the square column 12 in the embodiment, and the second limiting bolt 62 is arranged on the top end face of the circular column 11. When the installation is carried out, the screw head of the first limiting bolt 61 is propped against the bottom surface of the first clamping pin, and the screw head of the second limiting bolt 62 is propped against the top surface of the second clamping pin, so that the first clamping pin and the second clamping pin are limited.

Correspondingly, in order to avoid the interference between the second limit bolt 62 and other components, an avoiding slot 331 may be further disposed on the top surface of the second clamping leg, and when the second limit bolt 62 is mounted, the head of the second limit bolt 62 may be inserted into the avoiding slot 331 and abut against the bottom surface of the avoiding slot 331.

When the detection device is used, a worker can hold the first holding handle 22 and the second holding handle 32 by hands and insert the first detection clamping jaw 21 and the second detection clamping jaw 31 into the inner annular groove of the hole to be detected. Order about the second card foot afterwards and use circular column 11 to rotate as the axle to make first detection jack catch 21 and second detect jack catch 31 and all support and hold on the inner wall of downthehole annular, the internal diameter of downthehole annular is judged to the condition of opening and shutting of staff's accessible first card foot and second card foot this moment, thereby judges whether qualified the annular.

In prior art, all be equipped with the arc scale on the common measuring device, when measuring, the staff need carry out the reading through the arc scale to compare reading and standard parameter, just can learn the qualification condition of downthehole annular.

For the measurement of the downthehole annular of promotion, this embodiment will indicate the qualified circumstances of annular through the cooperation of dial 4 and locating component to make things convenient for the staff to operate.

Specifically, as shown in fig. 1, the indicating plate 4 is disposed on the top surface of the second clamping leg, an arc indicating notch 41 is disposed on the indicating plate 4, and the center of the arc indicating notch 41 coincides with the center of the circular column 11. When the second engaging portion rotates around the circular column 11, the indicating plate 4 rotates synchronously with the second engaging portion, so that the arc-shaped indicating notch 41 moves around the circular column 11. At this time, the movement stroke of the arc indicating notch 41 is matched with the opening and closing condition of the first clamping leg and the second clamping leg, so that the inner diameter of the ring groove in the hole can be represented by the arc indicating notch 41.

Referring to fig. 3 and 4, in the present embodiment, the positioning assembly includes: a housing 51, a latch 52 and a spring 53. The housing 51 is provided on the connection board 1, and the housing 51 is provided with a receiving hole 511. The plug 52 is disposed inside the receiving hole 511, and a stopper 523 is provided on the plug 52. The spring 53 is sleeved on the bolt 52, the top end of the spring 53 is connected with the blocking piece 523, and the bottom end of the spring 53 is connected with the inside of the bottom of the shell 51.

Before carrying out work, the staff can adjust the mounted position of indicator panel 4 according to the downthehole annular size of standard sample spare to when making the degree of opening and shutting of first calorie of foot and second calorie of foot and the downthehole annular size of standard sample spare match, arc indication incision 41 on the indicator panel 4 is just relative with the accommodation hole 511 on the casing 5.

When the measurement is performed, if the size of the ring groove in the hole to be measured is not uniform with the size of the ring groove in the hole of the standard sample, the arc-shaped indication notch 41 and the accommodation hole 511 are dislocated, at this time, the top end of the plug 52 abuts against the bottom surface of the indication plate 4, and the spring 53 is compressed. If the size of the ring groove in the hole to be measured is matched with that of the ring groove in the hole of the standard sample, the arc-shaped indicating notch 41 is opposite to the accommodating hole 511, and at the moment, the plug pin 52 moves upwards under the action of the spring 53, so that the top end of the plug pin 52 is inserted into the arc-shaped indicating notch 41.

Further, after completing the measurement of one sample to be measured, the worker should pull down the latch 52 so that the latch 52 is disengaged from the arc indicating incision 41. To facilitate the above operation, an operation block 524 may be disposed below the housing 51, and the bottom end of the plug 52 is connected to the operation block 524. When the latch 52 needs to be pulled down, the operating block 524 can be easily grasped by a worker, and when the latch 52 ascends under the action of the spring 53, the operating block 524 can limit the ascending stroke of the latch 52, so that the latch 52 is prevented from being separated from the housing 51.

Compared with the traditional measuring device, the device can quickly realize quantitative measurement of the size of the ring groove in the hole, so that workers can judge the qualified condition of the ring groove in the hole, and the measuring efficiency of the workers is improved.

Optionally, for the mounted position that makes things convenient for staff's adjustment dial 4, be equipped with a plurality of first locating holes 34 on the top surface of second calorie of angle, and a plurality of first locating holes 34 are the cyclic annular and arrange on circular port 33 week side. Accordingly, a second positioning hole 42 may be formed in the indicator panel 4, and a positioning bolt 421 may be disposed inside the second positioning hole 42. When adjusting, the worker can adjust the arc-shaped indicating notch 41 to a suitable position, and then insert the positioning bolt 421 into the first positioning hole 34 aligned with the second positioning hole 42, so as to lock the position of the indicating plate 4.

As an optional implementation manner of this embodiment, in order to reduce the difficulty of adjusting the indicating dial 4 by a worker, the side wall of the indicating dial 4 is provided with scale lines 43. Accordingly, an indication bar 512 may be provided on the sidewall of the housing 51 to match the graduation lines 43, and the length direction of the indication bar 512 is parallel to the axial direction of the receiving hole 511. When the device is adjusted, a worker can quickly complete the adjustment of the indicating disc 4 through the matching of the scale marks 43 and the indicating bars 512, so that the use convenience of the device is improved.

Because the unqualified condition of the ring groove in the hole to be tested includes that the inner diameter is smaller than the standard value and the inner diameter is greater than the standard value, and the standard value of the inner diameter of the ring groove in the common hole usually has a certain allowable tolerance, in order to facilitate the judgment of the unqualified reason of the ring groove in the hole by the worker, the arc-shaped indication notch 41 in the embodiment may include the first accommodating section 411 and the second accommodating section 412, and the plug pin 52 may include the first inserting section 521 and the second inserting section 522.

Specifically, as shown in fig. 7, the inner diameter of the second receiving section 412 is larger than the inner diameter of the first receiving section 411. As shown in fig. 4, the first insertion section 521 is located on top of the second insertion section 522, and the outer diameter of the first insertion section 521 is equal to the inner diameter of the first accommodation section 411, and the outer diameter of the second insertion section 522 is equal to the inner diameter of the second accommodation section 412.

When the inner diameter of the ring groove to be measured is smaller than the qualified interval, the plug pin 52 cannot enter the arc-shaped indicating notch 41. When the inner diameter of the ring groove to be measured is within the acceptable range, the rotation of the second locking pin can align the first receiving section 411 with the receiving hole 511, so that the first inserting section 521 enters the first receiving section 411. When the inner diameter of the ring groove to be measured is larger than the qualified interval, the rotation of the second locking pin can align the second accommodating section 412 with the accommodating hole 511, so that the second inserting section 522 can enter the second accommodating section 412. The staff can be according to the actual inserted position and the depth of insertion of bolt 52 and evaluate the qualification condition and unqualified reason of ring groove in the hole of treating the survey fast to accelerate the measurement of downthehole ring groove.

Optionally, in order to further improve the adaptability of the device to different sizes of annular grooves in holes, at least two arc-shaped indication notches 41 are provided, and the lengths of the first accommodating sections 411 of any two arc-shaped indication notches 41 are different. When the inner diameter of the ring groove to be measured is in the qualified interval, the first inserting section 521 of the device enters the first accommodating section 411, so that the allowable tolerance of the length of the first accommodating section 411 in the qualified interval is in direct proportion. The length of the first accommodating section 411 can be selected by a worker according to actual requirements, so that the device can meet different measurement requirements.

As another optional implementation manner of this embodiment, in order to reduce the labor intensity of the worker who continuously uses the device, the circular column 11 may be provided with a torsion spring 7, and one end of the torsion spring 7 is connected to the first clip, and the other end is connected to the second clip. When the worker drives the first grip handle 22 to approach the second grip handle 32, elastic potential energy is accumulated in the torsion spring 7. After the first detection clamping jaw 21 and the second detection clamping jaw 31 enter the inner ring groove of the hole to be detected, a worker can loosen the first holding handle 22 and the second holding handle 32, and at the moment, the elastic potential energy in the torsion spring 7 can rapidly drive the first holding handle 22 and the second holding handle 32 to be separated, so that the first detection clamping jaw 21 and the second detection clamping jaw 31 are abutted to the inner wall of the inner ring groove of the hole, and the operation amount of the worker is further reduced.

The following explains the effects of the above-described scheme:

this embodiment provides a measurement calliper of downthehole annular groove, can detect the qualified circumstances of downthehole annular groove fast through the cooperation of dial and locating component. Secondly, this device can be through the actual insertion position of bolt and the qualification condition of depth of insertion to the annular fast evaluation to accelerate the measurement of downthehole annular. In addition, this device can adjust the position of indicator panel according to actual demand to satisfy different measurement needs.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A measuring caliper for an annular groove in a hole is characterized by comprising: a connection assembly, the connection assembly comprising: the connecting plate comprises a connecting plate (1), a round column (11) and a square column (12), wherein the round column (11) is vertically arranged on the top surface of the connecting plate (1), the square column (12) is vertically arranged on the bottom surface of the connecting plate (1), and the square column (12) is aligned with the round column (11);

one end of the first clamping pin is provided with a first detection clamping jaw (21), and the other end of the first clamping pin is provided with a first holding handle (22); a connecting groove (23) for accommodating the connecting plate (1) is formed in the top surface of the first clamping leg, a square hole (24) is formed in the bottom surface of the connecting groove (23), and the square column (12) is inserted into the square hole (24);

one end of the second clamping pin is provided with a second detection clamping jaw (31), and the other end of the second clamping pin is provided with a second holding handle (32); a circular hole (33) for accommodating the circular column (11) is formed in the second clamping leg, and the circular column (11) can be rotatably inserted into the circular hole (33);

the indicating disc (4) is arranged on the top surface of the second clamping pin, an arc indicating notch (41) is formed in the indicating disc (4), and the circle center of the arc indicating notch (41) is overlapped with the circle center of the top end face of the circular column (11);

a positioning assembly, the positioning assembly comprising: the connecting plate comprises a shell (51), a bolt (52) and a spring (53), wherein the shell (51) is arranged on the connecting plate (1), and a containing hole (511) is formed in the shell (51); the plug pin (52) is arranged in the accommodating hole (511), and a blocking piece (523) is arranged on the plug pin (52); spring (53) cover is established on bolt (52), and the top of spring (53) links to each other with separation blade (523), and the bottom links to each other with casing (51) bottom is inside, works as arc indication incision (41) and accommodation hole (511) are right time relatively, inside arc indication incision (41) was inserted to bolt (52) top.

2. A measuring caliper of an in-hole annular groove according to claim 1, characterized in that: the arc-shaped indication notch (41) comprises a first containing section (411) and a second containing section (412), and the inner diameter of the second containing section (412) is larger than that of the first containing section (411); the plug pin (52) comprises a first insertion section (521) and a second insertion section (522), the first insertion section (521) is located at the top of the second insertion section (522), the outer diameter of the first insertion section (521) is equal to the inner diameter of the first accommodating section (411), and the outer diameter of the second insertion section (522) is equal to the inner diameter of the second accommodating section (412).

3. A measuring caliper of an in-hole annular groove according to claim 2, characterized in that: the number of the arc-shaped indicating notches (41) is at least two, and the lengths of the first accommodating sections (411) of any two arc-shaped indicating notches (41) are different.

4. A measuring caliper of an in-hole annular groove according to claim 1, characterized in that: a plurality of first positioning holes (34) are formed in the top surface of the second clamping corner, and the first positioning holes (34) are annularly arranged on the periphery of the circular hole (33); the indicating plate (4) is provided with a second positioning hole (42), a positioning bolt (421) is arranged inside the second positioning hole (42), and when the second positioning hole (42) is opposite to the first positioning hole (34), the positioning bolt (421) is inserted into the first positioning hole (34).

5. A measuring caliper of an in-hole annular groove according to claim 1, characterized in that: a first limiting bolt (61) is arranged on the bottom end face of the square column (12), and the screw head of the first limiting bolt (61) is propped against the bottom face of the first clamping pin; the top end face of the round column (11) is provided with a second limiting bolt (62), the top face of the second clamping leg is provided with an avoiding cutting groove (331), and the screw head of the second limiting bolt (62) is abutted to the bottom face of the avoiding cutting groove (331).

6. A measuring caliper of an in-hole annular groove according to claim 1, characterized in that: be equipped with scale mark (43) on the lateral wall of dial (4), it is corresponding be equipped with on the lateral wall of casing (51) and indicate strip (512), the length direction of indicating strip (512) is parallel with the axis direction of accommodation hole (511).

7. A measuring caliper of an in-hole annular groove according to claim 1, characterized in that: an operation block (524) is arranged below the shell (51), and the bottom end of the bolt (52) is connected with the operation block (524).

8. A measuring caliper of an in-hole annular groove according to claim 1, characterized in that: be equipped with torsional spring (7) on circular post (11), the one end and the first card foot of torsional spring (7) link to each other, and the other end links to each other with the second card foot.

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