CN217764741U

CN217764741U - Tolerance detection device

Info

Publication number: CN217764741U
Application number: CN202221850610.7U
Authority: CN
Inventors: 徐朝华; 蔡从利; 曾建辉; 黄晓俊
Original assignee: Eglite Wuhan Technology Co ltd
Current assignee: Eglite Wuhan Technology Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-11-08
Anticipated expiration: 2032-07-15

Abstract

The utility model provides a tolerance detection device relates to and detects instrument technical field. The utility model provides a tolerance detection device includes: each checking tool in the checking jig is provided with two checking grooves; two inspection grooves detect tolerance and lower tolerance respectively, wait to examine two inspection grooves that the piece put into corresponding inspection tool respectively, wait to examine the piece and all can place in two inspection grooves, should wait to examine the piece and be qualified in the last tolerance and the lower tolerance of this direction. The utility model provides a tolerance detection device has solved among the prior art test mode efficiency lower, is difficult to satisfy the batchization inspection, problem that the inspection cost is high.

Description

Tolerance detection device

Technical Field

The utility model belongs to the technical field of the inspection tool technique and specifically relates to a tolerance detection device is related to.

Background

Stainless steel is an important component of most medical instruments on the market at present, has the advantages of corrosion resistance, low temperature resistance, wear resistance and the like, but due to high processing cost, the mass production is generally realized by casting and then machining. After the casting and forming, the blank is required to be inspected and screened out according to machining requirements. The existing inspection mode is mainly that whether the surface of a metal rod has flaws is observed by naked eyes; or a vernier caliper or other gauge to measure each dimension. The inspection mode has low efficiency, is difficult to meet the requirement of batch inspection, and has high inspection cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a tolerance detection device to it is lower to alleviate the inspection mode efficiency that exists among the prior art, is difficult to satisfy the mass inspection, problem that inspection cost is high.

In order to solve the technical problem, the utility model provides a technical scheme lies in:

the utility model provides a tolerance detection device includes: each checking tool in the checking jig is provided with two checking grooves;

two inspection grooves detect tolerance and lower tolerance respectively, wait to examine two inspection grooves that the piece put into corresponding inspection tool respectively, wait to examine the piece and all can place in two inspection grooves, should wait to examine the piece and be qualified in the last tolerance and the lower tolerance of this direction.

As further technical scheme, the inspection tool includes that the nail bin rod is examined the utensil and is supported the nail rod and examine the utensil, and the nail bin rod is examined the utensil and is supported the nail rod and examine the utensil and all be provided with the tool that detects the equidirectional of examining the utensil, and the tool all is provided with two inspection grooves.

As a further technical scheme, the nail bin rod detection tool comprises a first tool and a second tool, the first tool is used for detecting the upper and lower tolerance of the nail bin rod in the first direction, and the second tool is used for detecting the upper and lower tolerance of the nail bin rod in the second direction.

As a further technical scheme, first tool includes that tolerance inspection groove and first tolerance inspection groove under first go up, and first tool is platelike, and first tolerance inspection groove homonymy under go up set up in first tool.

As a further technical scheme, including tolerance inspection groove and second lower tolerance inspection groove on the second tool, the second tool is platelike, and tolerance inspection groove homonymy sets up in the second tool under tolerance inspection groove and the second on the second.

As a further technical scheme, first tool and second tool all are provided with the storehouse pole mouth of taking, and the storehouse pole mouth of taking all communicates with the inspection groove on first tool and the second tool.

As a further technical scheme, the nail rod checking fixture comprises a third fixture and a fourth fixture, wherein the third fixture is used for detecting the upper and lower tolerance of the first direction of the nail rod, and the fourth fixture is used for detecting the upper and lower tolerance of the second direction of the nail rod.

As a further technical scheme, the third jig comprises a third upper tolerance detection groove and a third lower tolerance detection groove, the third jig is plate-shaped, and the third upper tolerance detection groove and the third lower tolerance detection groove are arranged on the same side of the third jig.

As a further technical scheme, including tolerance inspection groove and fourth lower tolerance inspection groove on the fourth tool, the fourth tool is platelike, and tolerance inspection groove and fourth lower tolerance inspection groove homonymy set up in the fourth tool on the fourth.

As further technical scheme, third tool and fourth tool all are provided with the mouth of taking of the pole of supporting the nail, support the pole of the nail mouth of taking all with the third tool and the inspection groove intercommunication on the fourth tool.

Compared with the prior art, the utility model provides a technical advantage that tolerance detection device has does:

the utility model provides a tolerance detection device includes: each checking tool in the checking jig is provided with two checking grooves; two inspection grooves detect tolerance and lower tolerance respectively, wait to examine two inspection grooves that corresponding inspection tool was put into respectively to the piece, can place in two inspection grooves when waiting to examine the piece, should wait to examine the piece and be qualified in the last tolerance and the lower tolerance of this direction. When the to-be-detected piece is detected, the to-be-detected piece is placed in a detection groove with a lower detection tolerance, if the to-be-detected piece can be placed in the detection groove with the lower detection tolerance, the lower tolerance of the to-be-detected piece in the direction is qualified, then the to-be-detected piece is placed in a detection groove with an upper detection tolerance, if the to-be-detected piece can be placed in the detection groove with the upper detection tolerance, the upper tolerance of the to-be-detected piece in the direction is qualified, and the upper and lower tolerance detection methods of the to-be-detected piece in other directions are the same as those in the above; through waiting to examine the piece and place in the inspection groove of difference with, whether the upper and lower tolerance of waiting to examine the piece of ability quick, accurate inspection is qualified, and the original mode of directly using slide caliper to measure a plurality of dimensional tolerance of fungible satisfies the standard and the requirement of batch inspection, and the real nature of operation is stronger, has improved inspection efficiency, reduces inspection cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the embodiments or related technologies will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first fixture in a tolerance detecting apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second fixture in the tolerance detecting apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a third fixture in the tolerance detecting device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fourth fixture in the tolerance detecting device according to an embodiment of the present invention.

An icon: 110-a first fixture; 111-a first upper tolerance-checking groove; 112-first lower tolerance checking groove; 120-a second fixture; 121-a second upper tolerance-checking groove; 122-a second lower tolerance inspection slot;

210-a third jig; 211-a third upper tolerance-checking groove; 212-third lower tolerance inspection slot; 220-a fourth jig; 221-a fourth upper tolerance inspection groove; 222-fourth lower tolerance check groove.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to 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," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 as a specific case by those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The tolerance detecting device provided by the embodiment comprises: each checking tool in the checking jig is provided with two checking grooves;

As shown in fig. 1 to 4, each of the detecting tools in the inspection jig may be relatively fixedly disposed, and different detecting tools may be disposed at different positions according to requirements. When the to-be-detected piece is detected, the to-be-detected piece is placed in a detection groove with a lower detection tolerance, if the to-be-detected piece can be placed in the detection groove with the lower detection tolerance, the lower tolerance of the to-be-detected piece in the direction is qualified, then the to-be-detected piece is placed in the detection groove with an upper detection tolerance, if the to-be-detected piece can be placed in the detection groove with the upper detection tolerance, the upper tolerance of the to-be-detected piece in the direction is qualified, and the upper and lower tolerance detection methods of the to-be-detected piece in other directions are the same as the above; through waiting to examine the piece and place in the inspection groove of difference with, whether the upper and lower tolerance of waiting to examine the piece of ability quick, accurate inspection is qualified, and the original mode of directly using slide caliper to measure a plurality of dimensional tolerance of fungible satisfies the standard and the requirement of batch inspection, and the real nature of operation is stronger, has improved inspection efficiency, reduces inspection cost.

In the optional technical scheme of this embodiment, the inspection tool includes that the utensil is examined to the nail storehouse pole and examines the utensil to the nail pole, and the utensil is examined to the nail storehouse pole and examines the utensil to the nail pole and all be provided with the not equidirectional tool of examining the utensil, and the tool all is provided with two inspection grooves.

Specifically, as shown in fig. 1 to 4, the nail bin rod checking fixture is provided with jigs for detecting different directions of the nail bin rod, each jig is provided with two checking grooves, and the two checking grooves on the jig are used for detecting whether the upper and lower tolerances of the nail bin rod in the direction are qualified or not; the screw rod checking fixture is provided with fixtures for detecting different directions of the screw rod, each fixture is provided with two checking grooves, and the two checking grooves on the fixture are used for detecting whether the upper and lower tolerance of the screw rod in the direction is qualified. The nail bin rod checking fixture and the nail rod checking fixture are arranged simultaneously, the nail bin rod checking fixture and the nail rod checking fixture are provided with fixtures for detecting workpieces to be detected in different directions, and the fixtures are provided with detection grooves for detecting vertical tolerance, so that whether vertical tolerance of the nail bin rod and the nail rod is qualified can be detected by the nail bin rod checking fixture and the nail rod checking fixture simultaneously, the detection efficiency is improved, and the detection cost is reduced.

In an optional technical solution of this embodiment, the tool for checking a nail magazine rod comprises a first tool 110 and a second tool 120, wherein the first tool 110 is used for detecting an upper and lower tolerance of the nail magazine rod in a first direction, and the second tool 120 is used for detecting an upper and lower tolerance of the nail magazine rod in a second direction.

Specifically, as shown in fig. 1 and fig. 2, when detecting whether the upper and lower tolerances of the nail bin rod are qualified, the checking grooves on the first jig 110 and the second jig 120 are set to be equal in length, the nail bin rod is divided into a first direction and a second direction according to the front and back relative and the left and right relative, the first jig 110 is used for detecting the upper and lower tolerances of the first direction of the nail bin rod, the second jig 120 is used for detecting the upper and lower tolerances of the second direction of the nail bin rod, the first direction and the second direction of the nail bin rod are respectively placed into the two checking grooves on the first jig 110 and the two checking grooves on the second jig 120 at one time, and if the upper and lower tolerances of the nail bin rod on the first jig 110 and the second jig 120 are both qualified, the nail bin rod is determined to be a qualified piece. Through putting into the nail storehouse pole and taking out different inspection grooves, can detect out whether this nail storehouse pole is qualified piece, easy operation, the accuracy is higher, and inspection efficiency promotes, and inspection cost reduces.

In an optional technical solution of this embodiment, the first fixture 110 includes a first upper tolerance checking groove 111 and a first lower tolerance checking groove 112, the first fixture 110 is plate-shaped, and the first upper tolerance checking groove 111 and the first lower tolerance checking groove 112 are disposed on the same side of the first fixture 110.

Specifically, as shown in fig. 1, the first upper tolerance checking groove 111 and the first lower tolerance checking groove 112 are disposed on the same side of the first fixture 110 and are arranged in parallel. When the upper and lower tolerance of the nail bin rod in the first direction is detected, the nail bin rod is placed in the first upper tolerance detection groove 111, and if the nail bin rod can be completely placed in the first upper tolerance detection groove, the upper tolerance of the nail bin rod in the first direction is qualified; and then the nail bin rod is placed in the first lower tolerance detection groove 112, and then the outer contour of the workpiece is detected by using a 0.4mm and a 0.5mm feeler gauge in sequence, wherein the lower tolerance is qualified if the 0.4mm feeler gauge can be plugged in and the 0.5mm feeler gauge cannot be plugged in, and the lower tolerance is unqualified if the 0.5mm feeler gauge can also be plugged in. And if the upper and lower tolerances are qualified, judging that the upper and lower tolerances in the first direction of the nail bin rod are both qualified. In addition, since the first upper tolerance detecting groove 111 and the first lower tolerance detecting groove 112 are arranged on the same side of the first jig 110, when the upper and lower tolerances of the nail bin rod in the first direction are detected, an operator can detect without turning over the first jig 110, and the operation is more convenient; and because first upper tolerance inspection groove 111 and first lower tolerance inspection groove 112 set up side by side, when guaranteeing the detection effect, reduce first tool 110 volume, reduce and examine a manufacturing cost.

In an optional technical solution of this embodiment, the second fixture 120 includes a second upper tolerance checking groove 121 and a second lower tolerance checking groove 122, the second fixture 120 is plate-shaped, and the second upper tolerance checking groove 121 and the second lower tolerance checking groove 122 are disposed on the same side of the second fixture 120.

Specifically, as shown in fig. 2, the second upper tolerance checking groove 121 and the second lower tolerance checking groove 122 are disposed on the same side of the second fixture 120 and are disposed in parallel. When the upper and lower tolerance of the nail bin rod in the second direction is detected, the nail bin rod is firstly placed in the second upper tolerance detection groove 121, and if the nail bin rod can be completely placed in the second upper tolerance detection groove, the upper tolerance of the nail bin rod in the second direction is qualified; and after the nail bin rod is placed in the second lower tolerance detection groove 122, the outline of the workpiece is detected by using a 0.4mm and 0.5mm feeler gauge in sequence, if the 0.4mm feeler gauge can be plugged in and the 0.5mm feeler gauge cannot be plugged in, the lower tolerance is qualified, and if the 0.5mm feeler gauge can also be plugged in, the lower tolerance is unqualified. And if the upper tolerance and the lower tolerance are qualified, judging that the upper tolerance and the lower tolerance of the nail bin rod in the second direction are qualified. In addition, since the second upper tolerance detection groove 121 and the second lower tolerance detection groove 122 are arranged on the same side of the second jig 120, when the upper and lower tolerances of the nail bin rod in the second direction are detected, an operator can perform detection without turning over the second jig 120, and the operation is more convenient; and because tolerance inspection groove 121 and tolerance inspection groove 122 set up side by side under the second on the second, when guaranteeing detection effect, reduce second tool 120 volume, reduce and examine a manufacturing cost.

In the optional technical scheme of this embodiment, first tool 110 and second tool 120 all are provided with the storehouse pole and take the mouth, and the storehouse pole is taken the mouth and all communicates with the inspection groove on first tool 110 and the second tool 120.

Specific combination figure 1 and 2 show, all be provided with the storehouse pole mouth of taking on the lateral wall in tolerance inspection groove 122 under tolerance inspection groove 121 and the second on tolerance inspection groove 111, the first tolerance inspection groove 112 of going up, the second, when detecting the upper and lower tolerance of each direction of storehouse pole, put into or take out corresponding inspection groove with the storehouse pole through the storehouse pole mouth of taking, make things convenient for the operator to operate, promote detection efficiency.

In the optional technical scheme of this embodiment, the tool for checking a nail pushing rod comprises a third tool 210 and a fourth tool 220, the third tool 210 is used for detecting the upper and lower tolerance of the nail pushing rod in the first direction, and the fourth tool 220 is used for detecting the upper and lower tolerance of the nail pushing rod in the second direction.

As shown in fig. 3 and 4, when detecting whether the upper and lower tolerances of the nail-supporting rod are qualified, the checking grooves on the third jig 210 and the fourth jig 220 are set to be equal in length, the nail-supporting rod is divided into a first direction and a second direction according to the front and back relative and the left and right relative, the third jig 210 is used for detecting the upper and lower tolerances of the first direction of the nail-supporting rod, the fourth jig 220 is used for detecting the upper and lower tolerances of the second direction of the nail-supporting rod, the two checking grooves on the third jig 210 and the two checking grooves on the fourth jig 220 are respectively placed into the first direction and the second direction of the nail-supporting rod once, and if the upper and lower tolerances of the nail-supporting rod on the third jig 210 and the fourth jig 220 are qualified, the nail-supporting rod is determined to be a qualified piece. Through will support the nail pole and put into and take out different inspection grooves, can detect out whether should support the nail pole for the qualification piece, easy operation, the accuracy is higher, and inspection efficiency promotes, and inspection cost reduces.

In an optional technical solution of this embodiment, the third fixture 210 includes a third upper tolerance checking groove 211 and a third lower tolerance checking groove 212, the third fixture 210 is plate-shaped, and the third upper tolerance checking groove 211 and the third lower tolerance checking groove 212 are disposed on the same side of the third fixture 210.

Specifically, as shown in fig. 3, the third upper tolerance-detecting groove 211 and the third lower tolerance-detecting groove 212 are disposed on the same side of the third fixture 210 and are arranged in parallel. When the vertical tolerance of the nail abutting rod in the first direction is detected, the nail abutting rod is placed in the third upper tolerance detection groove 211, and if the nail abutting rod can be completely placed in the third upper tolerance detection groove, the vertical tolerance of the nail abutting rod in the first direction is qualified; and after the nail abutting rod is placed in the third lower tolerance detection groove 212, the outer contour of the workpiece is detected by using the 0.4mm and 0.5mm feelers in sequence, if the 0.4mm feeler can be plugged in and the 0.5mm feeler cannot be plugged in, the lower tolerance is qualified, and if the 0.5mm feeler can also be plugged in, the lower tolerance is unqualified. And if the upper and lower tolerances are qualified, judging that the upper and lower tolerances in the first direction of the nail abutting rod are qualified. In addition, since the third upper tolerance checking groove 211 and the third lower tolerance checking groove 212 are arranged on the same side of the third jig 210, when the upper and lower tolerances of the nail abutting rod in the first direction are detected, an operator can perform detection without turning over the third jig 210, and the operation is more convenient; and because tolerance inspection groove 211 and tolerance inspection groove 212 are set up side by side down on the third, when guaranteeing detection effect, reduce third tool 210 volume, reduce and examine a manufacturing cost.

In an optional technical solution of this embodiment, the fourth fixture 220 includes a fourth upper tolerance checking groove 221 and a fourth lower tolerance checking groove 222, the fourth fixture 220 is plate-shaped, and the fourth upper tolerance checking groove 221 and the fourth lower tolerance checking groove 222 are disposed on the same side of the fourth fixture 220.

Specifically, as shown in fig. 4, the fourth upper tolerance checking groove 221 and the fourth lower tolerance checking groove 222 are disposed on the same side of the fourth fixture 220 and are disposed in parallel. When the vertical tolerance of the nail abutting rod in the first direction is detected, the nail abutting rod is placed in the fourth upper tolerance detection groove 221, and if the nail abutting rod can be completely placed in the fourth upper tolerance detection groove, the vertical tolerance of the nail abutting rod in the first direction is qualified; and after the nail abutting rod is placed in the fourth lower tolerance detection groove 222, the outline of the workpiece is detected by using the 0.4mm and 0.5mm feelers, if the 0.4mm feeler can be plugged in and the 0.5mm feeler cannot be plugged in, the lower tolerance is qualified, and if the 0.5mm feeler can also be plugged in, the lower tolerance is unqualified. And if the upper and lower tolerances are qualified, judging that the upper and lower tolerances in the first direction of the nail abutting rod are qualified. In addition, since the fourth upper tolerance checking groove 221 and the fourth lower tolerance checking groove 222 are arranged on the same side of the fourth jig 220, when the upper and lower tolerances of the nail abutting rod in the first direction are detected, an operator can perform detection without turning over the fourth jig 220, and the operation is more convenient; and because tolerance inspection groove 221 and fourth lower tolerance inspection groove 222 are arranged side by side on the fourth, when guaranteeing detection effect, reduce fourth tool 220 volume, reduce and examine a manufacturing cost.

Among the optional technical scheme of this embodiment, third tool 210 and fourth tool 220 all are provided with the nail pole of supporting and take the mouth, support the nail pole and take the mouth all with the third tool 210 and the fourth tool 220 on the inspection groove intercommunication.

As shown in specific combination of fig. 1 and 2, the side walls of the third upper tolerance detection groove 211, the third lower tolerance detection groove 212, the fourth upper tolerance detection groove 221 and the fourth lower tolerance detection groove 222 are provided with nail rod taking openings, and when the upper and lower tolerances in all directions of the nail rod are detected, the nail rod is placed into or taken out of the corresponding detection grooves through the nail rod taking openings, so that the operation of an operator is facilitated, and the detection efficiency is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A tolerance sensing device, comprising: each checking tool in the checking jig is provided with two checking grooves;

two the inspection groove detects tolerance and lower tolerance respectively, waits to examine that the piece is put into two of corresponding inspection tool respectively the inspection groove works as it all can place in two to wait to examine the piece the inspection groove, should wait to examine that the last tolerance and the lower tolerance of piece in this direction are qualified.

2. The tolerance detecting device according to claim 1, wherein the detecting jig comprises a nail bin rod detecting tool and a nail abutting rod detecting tool, the nail bin rod detecting tool and the nail abutting rod detecting tool are both provided with a jig for detecting different directions of the workpiece to be detected, and the jig is both provided with two detecting grooves.

3. The tolerance detecting device according to claim 2, wherein the cartridge rod detecting tool comprises a first tool (110) and a second tool (120), the first tool (110) is used for detecting the upper and lower tolerance of the cartridge rod in a first direction, and the second tool (120) is used for detecting the upper and lower tolerance of the cartridge rod in a second direction.

4. The tolerance detecting device according to claim 3, wherein the first fixture (110) comprises a first upper tolerance detecting groove (111) and a first lower tolerance detecting groove (112), the first fixture (110) is plate-shaped, and the first upper tolerance detecting groove (111) and the first lower tolerance detecting groove (112) are disposed on the same side of the first fixture (110).

5. The tolerance detecting device according to claim 3, wherein the second jig (120) comprises a second upper tolerance detecting groove (121) and a second lower tolerance detecting groove (122), the second jig (120) is plate-shaped, and the second upper tolerance detecting groove (121) and the second lower tolerance detecting groove (122) are arranged on the same side of the second jig (120).

6. The tolerance detection device according to claim 3, wherein the first fixture (110) and the second fixture (120) are provided with a cartridge rod taking port, and the cartridge rod taking ports are communicated with the inspection grooves on the first fixture (110) and the second fixture (120).

7. The tolerance detection device according to claim 2, wherein the nail-supporting rod detection tool comprises a third tool (210) and a fourth tool (220), the third tool (210) is used for detecting the up-and-down tolerance of the nail-supporting rod in the first direction, and the fourth tool (220) is used for detecting the up-and-down tolerance of the nail-supporting rod in the second direction.

8. The tolerance detecting device according to claim 7, wherein the third fixture (210) comprises a third upper tolerance detecting groove (211) and a third lower tolerance detecting groove (212), the third fixture (210) is plate-shaped, and the third upper tolerance detecting groove (211) and the third lower tolerance detecting groove (212) are disposed on the same side of the third fixture (210).

9. The tolerance detecting device according to claim 7, wherein the fourth fixture (220) comprises a fourth upper tolerance detecting groove (221) and a fourth lower tolerance detecting groove (222), the fourth fixture (220) is plate-shaped, and the fourth upper tolerance detecting groove (221) and the fourth lower tolerance detecting groove (222) are disposed on the same side of the fourth fixture (220).

10. The tolerance detecting device according to claim 7, wherein the third jig (210) and the fourth jig (220) are provided with nail-pushing rod taking ports, and the nail-pushing rod taking ports are communicated with the inspection grooves on the third jig (210) and the fourth jig (220).