Gauge and detection device for detecting the diameter of an external thread

Abstract

The present application relates to a kind of gauge for detecting outer thread diameter and detection device, the gauge includes the multiple sleeve of sequentially sleeved arrangement layer by layer, the side wall of each sleeve is provided with thread detection hole, adjacent sleeve can be slidably telescopic each other, so that the sleeve in inner layer is relative to the sleeve in outer layer with extended position and retracted position, in extended position, the thread detection hole of the sleeve in inner layer exposes the sleeve in outer layer.The gauge for detecting outer thread diameter and detection device of the present application, adjacent sleeve can be slidably telescopic each other, in extended position, the thread detection hole of the sleeve in inner layer exposes the sleeve in outer layer, so that the thread detection hole adapts to the need of outer thread detection.When not needing to use thread detection hole, multiple sleeve can be retracted, to facilitate centralized storage, greatly improve the gauge taking and using convenience, avoid the problem of inconvenient storage and inconvenient use of traditional different specifications ring gauge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of measuring tools, in particular to a gauge for detecting the diameter of external threads and a detection device. BACKGROUND

[0002] As a gauge for measuring the size of external threads, the threaded hole of the ring gauge for measuring the diameter of external threads is prone to entering impurities such as iron filings and dust, which seriously affects the service life and measurement accuracy of the gauge. After the gauge is used, the attached matter in the measuring thread needs to be cleaned in time and stored in the specified gauge box. The large number of gauges makes it inconvenient for the inspector to take, identify and use them. SUMMARY

[0003] Therefore, the present application provides a gauge for detecting the diameter of external threads and a detection device to solve the problems of inconvenient storage and use.

[0004] In one aspect, the present application provides a gauge for detecting the diameter of external threads, comprising a plurality of sleeves arranged in layers in sequence, each sleeve having a threaded detection hole in the side wall, and adjacent sleeves being capable of sliding expansion and contraction relative to each other, so that the inner layer sleeve has an extended position and a retracted position relative to the outer layer sleeve. In the extended position, the threaded detection hole of the inner layer sleeve is exposed to the outer layer sleeve.

[0005] In another aspect, the present application provides a detection device comprising the above-mentioned gauge.

[0006] The above-mentioned gauge for detecting the diameter of external threads and the detection device, the gauge comprising a plurality of sleeves arranged in layers in sequence, each sleeve having a threaded detection hole in the side wall, and adjacent sleeves being capable of sliding expansion and contraction relative to each other, so that the inner layer sleeve has an extended position and a retracted position relative to the outer layer sleeve. In the extended position, the threaded detection hole of the inner layer sleeve is exposed to the outer layer sleeve, to adapt to the need for external thread detection. When the threaded detection hole is not needed, the sleeves can be retracted, facilitating centralized storage. This retraction method greatly improves the convenience of taking, placing and using the gauge, and avoids the problems of inconvenient storage and use of traditional gauges of different specifications. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings of embodiments according to these drawings without creative labor.

[0008] Figure 1Structure diagram of the gauge for detecting the diameter of the external thread in an embodiment;

[0009] Figure 2 For Figure 1 Structure diagram of the gauge in which the outermost sleeve is removed;

[0010] Figure 3 For Figure 2 Structure diagram of the gauge in which the outermost sleeve is removed;

[0011] Figure 4 Structure diagram of the gauge in which the outermost sleeve is removed;

[0012] Figure 5 Structure diagram of the gauge in which the outermost sleeve is removed;

[0013] Figure 6 Structure diagram of the gauge in which the outermost sleeve is removed;

[0014] Figure 7 Structure diagram of the gauge in which the outermost sleeve is removed;

[0015] Figure 8 For Figure 7 Structure diagram of the gauge in which the outermost sleeve is removed;

[0016] Figure 9 Structure diagram of the gauge in which the outermost sleeve is removed;

[0017] Figure 10 Structure diagram of the gauge in which the outermost sleeve is removed;

[0018] Figure 11 For Figure 10 Structure diagram of the gauge in which the outermost sleeve is removed;

[0019] Figure 12 Structure diagram of the gauge in which the outermost sleeve is removed; DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] In the description of the present application, the terms "first", "second", "third" and the like in the description are used only for descriptive purposes and not to show relative importance or imply that the described technical features are limited to a quantity of one. Thus, a feature defined with "first", "second" or "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0022] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element.

[0024] Referring to Figure 1 As shown in the drawings, an embodiment of the present application provides a gauge 100 for detecting the diameter of an external thread, which includes a plurality of sleeves 110 arranged in sequence by layering. In order to facilitate understanding, Figure 1 Five sleeves 110 are shown in the drawings, and in other embodiments, the number of sleeves 110 can be two or more than two, and the number of sleeves 110 is not limited.

[0025] The side wall of each sleeve 110 is provided with a thread detection hole 111. Understandably, the gauge 100 of the application is used as a tool for detecting the diameter of external threads, and the thread detection hole 111 is a standard threaded hole, which is used for detecting the external threads of parts such as studs or screws, thereby achieving the detection of the external threads of the object to be measured. In some embodiments, the diameter of the thread detection hole 111 of the sleeve 110 located on the outer layer is greater than the diameter of the thread detection hole 111 of the sleeve 110 located on the inner layer, so that the operator can intuitively determine whether the selected thread detection hole 111 is too large or too small according to the size of the sleeve 110. For example, when the thread detection hole 111 of the sleeve 110 located on the inner layer is used to detect the external threads of the object to be measured, if the external threads of the object to be measured cannot pass through the thread detection hole 111, a thread detection hole 111 with a larger size needs to be selected for detection. At this time, the operator can select the thread detection hole 111 of the sleeve 110 located on the outer layer to test the size of the thread detection hole 111. In other embodiments, the thread detection holes 111 are standard threaded holes used for detecting the diameter of external threads, and the surrounding positions of the thread detection holes 111 on the sleeve 110 can be marked with corresponding sizes, so as to facilitate the operator to quickly select a thread detection hole 111 with a suitable size to detect the diameter of the external threads of the object to be measured.

[0026] The adjacent sleeves 110 can slide relative to each other, so that the sleeve 110 located on the inner layer has an extended position and a retracted position relative to the sleeve 110 located on the outer layer. In the extended position, the thread detection hole 111 of the sleeve 110 located on the inner layer is exposed to the sleeve 110 located on the outer layer, so as to adapt to the need of external thread detection. When the thread detection hole 111 is not needed, the sleeve 110 located on the inner layer can be moved to the retracted position relative to the sleeve 110 located on the outer layer, and finally the plurality of sleeves 110 are retracted, thereby facilitating centralized storage, and the retraction mode greatly improves the convenience of taking, placing, using the gauge 100, and avoids the problems of inconvenient storage and use when the traditional tool box is used to store a plurality of ring gauges with different sizes.

[0027] Further, in the retracted position, the sleeve 110 located on the outer layer blocks the thread detection hole 111 of the sleeve 110 located on the inner layer. Therefore, by using the gauge 100 of the application, when it is needed, the corresponding sleeve 110 only needs to be pulled out from the sleeve 110 located on the outer layer, and when it is not needed, the sleeves 110 can be retracted, and the thread detection hole 111 of the sleeve 110 located on the inner layer is blocked by the sleeve 110 located on the outer layer, thereby reducing the probability of dust entering the thread detection hole 111, and facilitating the extension of the service life of the gauge 100 and the maintenance of the measurement accuracy.

[0028] In the retracted position, the end faces of the multiple sleeves 110 facing the extension direction are flush. This not only makes the overall surface of the gauge 100 neat when it is not in use, reducing sharp edges and the chance of scratching other objects such as tool boxes, but also makes it less likely for dirt and grime to accumulate, reducing the attachment of dust or debris, so as to maintain the cleanliness of each sleeve 110 of the gauge 100 and thus maintain good detection accuracy.

[0029] Combination Figure 2 and Figure 3 As shown, the inner sleeve 110 has a perforation 112. To facilitate observation of this perforation 112, Figure 2 and Figure 3 In the middle, it has already been Figure 1 The outermost sleeve 110 in the gauge 100 shown is removed. In this embodiment, in the extended position, the projection of the thread detection hole 111 of the outer sleeve 110 along the hole axis onto the inner sleeve 110 falls into the through hole 112. Thus, when the screw to be tested is moved along the hole axis of the thread detection hole 111 of the outer sleeve 110, the through hole 112 of the inner sleeve 110 can provide clearance for the screw to be tested, thereby facilitating the screw to be screwed into the thread detection hole 111, so that the diameter of the external thread of the screw can be detected using the thread detection hole 111.

[0030] Figure 4 and Figure 5 As shown, in some embodiments, the outer wall of the inner sleeve 110 is provided with a groove 113, and the outer sleeve 110 is provided with a limiting member 114 that cooperates with the groove 113. When the outer sleeve 110 and the inner sleeve 110 slide and extend relative to each other, the limiting member 114 slides in the groove 113. The end of the groove 113 that is farther from the thread detection hole 111 forms a first limiting part 113a. In the extended position, the limiting member 114 cooperates with the first limiting part 113a to restrict the outward extension movement of the inner sleeve 110 relative to the outer sleeve 110. In this way, by pulling the inner sleeve 110, the multiple sleeves 110 of the gauge 100 can be stretched out to meet the needs of detecting the external thread of the object to be tested using the thread detection holes 111 on the multiple sleeves 110.

[0031] In some embodiments, a second limiting portion 113b is formed at the end of the slide groove 113 closer to the thread detection hole 111. In the retracted position, the limiting member 114 cooperates with the second limiting portion 113b to restrict the inner sleeve 110 from retracting inward relative to the outer sleeve 110, thereby preventing the inner sleeve 110 from retracting excessively into the outer sleeve 110.

[0032] In embodiments where the sleeve 110 is provided with a perforation 112, such asFigure 4 As shown, the sliding groove 113 can be arranged at the position corresponding to the through hole 112 and partially located at the outer periphery of the through hole 112. For example, Figure 5 As shown, the sliding groove 113 can be arranged at the position corresponding to the through hole 112 and partially located at the outer periphery of the through hole 112. For example,

[0033] It should be noted that in the plurality of sleeves 110 of the gauge 100, the sliding grooves 113 in the corresponding sleeves 110 can be the same or different. As long as the limit piece 114 arranged on the outer sleeve 110 can be slidably located in the sliding groove 113, the sliding and expansion between the sleeves 110 can be guided, and the sliding and expansion stroke between the sleeves 110 can be constrained. Figure 6 As shown, taking three sleeves 110 as an example, in the middle sleeve 110, the sliding groove 113 is arranged at the position corresponding to the through hole 112 and partially located at the outer periphery of the through hole 112, and in the innermost sleeve 110, the sliding groove 113 is arranged at the position corresponding to the through hole 112. The three sleeves 110 are sequentially sleeved together, the limit piece 114 on the outermost sleeve 110 cooperates with the sliding groove 113 of the middle sleeve 110, and the limit piece 114 on the middle sleeve 110 cooperates with the sliding groove 113 of the innermost sleeve 110.

[0034] In some embodiments, the depth of the two end positions of the sliding groove 113 is greater than the depth of the middle position, so that the first limit part 113a and the second limit part 113b at the two end positions of the sliding groove 113 can be more stably matched with the limit piece 114, so as to improve the limiting effect when the sleeves 110 move to the limit position.

[0035] The limit piece 114 includes a spring plunger and a ball head, and the ball head is in elastic contact with the groove wall of the sliding groove 113 under the driving of the spring plunger. In this way, the friction between the ball head and the groove wall of the sliding groove 113 is small, and the relative sliding and expansion between the sleeves 110 will not produce excessive resistance, so as to facilitate the smooth sliding between the sleeves 110. At the same time, the spring plunger can resist the ball head in the sliding groove 113, so as to limit the ball head from moving out of the sliding groove 113, thereby forming a good constraint effect on the sliding and expansion between the sleeves 110.

[0036] It should be noted that the plurality of sleeves 110 are sleeved together in a telescopic manner to adapt to the sliding and telescopic requirement therebetween, and the inner wall of each sleeve 110 has a plurality of sides parallel to the respective axial direction, and the shape of the outer wall of the sleeve 110 is formed by the sides, for example, the shape enclosed by the plurality of sides is a prism. It can be understood that the shape enclosed by the inner sides of the inner cavity of the sleeve 110 is also a prism, so that the plurality of sleeves 110 can be sleeved together in a sliding and telescopic manner. With this structure, the sleeve 110 has a plurality of flat sides, so that the threaded detection hole 111 can be conveniently formed on the plurality of sides of the sleeve 110. Of course, in other embodiments, the sleeve 110 can be a cylindrical sleeve, and after being positioned by the positioning device, the threaded detection hole 111 can still be accurately formed. The shape of the sleeve is not limited here.

[0037] The plurality of sleeves 110 have the same cross-sectional shape, for example, the plurality of sleeves 110 have the shape of a triangular prism or the shape of a pentagonal prism.

[0038] At least two sides of the sleeve 110 are provided with the threaded detection hole 111. In some embodiments, the threaded detection holes 111 located at different sides have different diameters.

[0039] In some embodiments, the sleeve 110 located at the innermost layer is provided with a gage thread hole (not shown in the figure), and the threaded detection hole 111 of the sleeve 110 located at the outermost layer corresponds to the minimum limit size and the maximum limit size of the standard thread of the same specification, respectively, and in the extended position, the threaded detection hole 111 of the sleeve 110 located at the outermost layer is coaxial with the gage thread hole of the sleeve 110 located at the innermost layer. In this embodiment, the gage thread hole plays the role of the stop end of the ring gage, and correspondingly, the threaded detection hole 111 corresponding to the specification of the gage thread hole plays the role of the through end of the ring gage, so that when the gage 100 of the application detects the external thread of the object to be detected, it does not need to adopt an independently arranged stop end or through end, thereby reducing the operation difficulty of the operator in taking and placing the tool and improving the operation convenience.

[0040] In combination Figure 7 As shown, the sleeve 110 located at the innermost layer is connected with a pull rod 115, and the pull rod 115 is used to drive the sleeve 110 located at the inner layer to perform an extension movement relative to the sleeve 110 located at the outer layer under the action of an external force. When the gage 100 is used, the operator can pull the pull rod 115 to stretch out the plurality of sleeves 110 to expose the threaded detection hole 111 on the corresponding sleeve 110, so as to use the detection of the diameter of the external thread.

[0041] It should be noted that the opening direction of the threaded detection hole 111 of the sleeve 110 has a plurality of possible embodiments.

[0042] In some embodiments, the hole axis of the thread detection hole 111 is perpendicular to the longitudinal axis of the sleeve 110. The thread detection hole 111 perpendicular to the longitudinal axis of the sleeve 110 is easy to open and the precision of the thread detection hole 111 can be controlled.

[0043] In other embodiments, the hole axis of the thread detection hole 111 is arranged at an acute angle with the longitudinal axis of the sleeve 110. In the case of a fixed wall thickness of the sleeve 110, the size of the thread detection hole 111 along the hole axis can be increased, i.e. the thread detection hole 111 can be made deeper, to provide a sufficient thread depth to adapt to the detection needs, facilitating accurate detection of the external thread of the object to be measured.

[0044] Further, the angle between the hole axis of the thread detection hole 111 and the longitudinal axis of the sleeve 110 is in the range of 45° to 75°. In this angle range, the hole depth of the thread detection hole 111 can be maintained to facilitate the detection accuracy of the external thread of the object to be measured, and the angle between the hole axis of the thread detection hole 111 and the longitudinal axis of the sleeve 110 is not too small to avoid the punching tool slipping relative to the sleeve 110.

[0045] In combination with Figure 7 and Figure 8 It is shown that another aspect of the present application provides a detection device 200 comprising the gauge 100 as described above.

[0046] The detection device 200 further comprises a base 210, a support frame 220 and a rotating member 230. The support frame 220 is connected to the base 210, which can be welded to the base 210 or connected to the base 210 by screws 200a. The connection mode of the support frame 220 to the base 210 is not limited here.

[0047] The rotating member 230 is rotationally connected to the support frame 220, and the gauge 100 is connected to the rotating member 230, so that the rotation angle of the gauge 100 around the longitudinal axis of the sleeve 110 can be adjusted to facilitate the adjustment of the appropriate thread detection hole 111 to the position convenient for checking the external thread of the object to be measured.

[0048] Further, in combination with Figure 9 It is shown that the rotating member 230 is provided with a receiving cavity 230a with an opening. The plurality of sleeves 110 of the gauge 100 can extend out of the receiving cavity 230a from the opening and can be retracted into the receiving cavity 230a, so that the gauge 100 can be stored by the rotating member 230 to achieve dustproofing. In this arrangement, the storage operation of the gauge 100 is simplified.

[0049] The outermost sleeve 110 of the gauge 100 is provided with a groove (not shown in the figure). The rotating member 230 is provided with a spring plunger 230b with a ball head. The outermost sleeve 110 is slidably disposed in the receiving cavity 230a of the rotating member 230, so that the spring plunger 230b and the groove of the outermost sleeve 110 are in sliding engagement. The sliding engagement between the spring plunger 230b and the groove limits the stroke of the outermost sleeve 110 in the receiving cavity 230a of the rotating member 230 and prevents the outermost sleeve 110 from slipping off the rotating member 230.

[0050] Combination Figure 8 As shown, a soft cover 240 is connected to the end of the rotating member 230 near the opening. The soft cover 240 is divided into multiple baffles 241 by a radially spaced dividing groove 240a along its central part. When the sleeve 110 extends out of the receiving cavity 230a, the sleeve 110 can push open the baffles 241, and when the sleeve 110 retracts into the receiving cavity 230a, the baffles 241 restore their deformation to cover the opening, thereby maintaining the cleanliness of the gauge 100 inside the receiving cavity 230a.

[0051] The material of the soft cover 240 can be rubber or silicone, and there is no limitation here.

[0052] Combination Figure 9 As shown, the end face of the rotating part 230 near the opening is provided with a mounting groove 231, and the soft cover 240 is connected to the mounting groove 231.

[0053] In other embodiments, combined Figure 9 and Figure 10 As shown, the end face of the rotating member 230 near the opening is provided with a mounting groove 231. The mounting groove 231 is used to detachably install the dust cover 231a. When the dust cover 231a is engaged with the mounting groove 231, the dust cover 231a covers the opening, thereby preventing dust from entering the receiving cavity 230a and maintaining the cleanliness of the gauge 100 located in the receiving cavity 230a.

[0054] In some implementations, combined Figure 10 As shown, a knob 250 is provided on one side of the rotating component 230 opposite to the gauge 100. The knob 250 is used to drive the rotating component 230 to rotate relative to the support frame 220.

[0055] Furthermore, combined Figure 10 and Figure 11 As shown, the rotating component 230 can be connected to the rotating shaft 290 through the flange 280. Specifically, fasteners such as screws and bolts 280a are used to pass through the mounting holes of the flange 280 and connect to the rotating component 230. The rotating shaft 290 is connected to the flange 280 and is rotatably mounted on the support frame 220, so that the rotating component 230 can rotate relative to the support frame 220 around the rotating shaft 290.

[0056] In some embodiments, the base 210 is provided with a side frame 260 and a clamping structure 270 connected to the side frame 260. The side frame 260 can be connected to the base 210 by welding or by screws 200a, which is not limited herein. The circumferential side of the rotating member 230 is provided with a plurality of spaced clamping portions 232. When the rotating member 230 is rotated to a position where any one of the clamping portions 232 is opposite to the clamping structure 270, the rotating member 230 is limited from rotating by the cooperation between the clamping structure 270 and the clamping portion 232, so that the gauge 100 is kept stable relative to the base 210, thereby detecting the external thread of the object to be measured.

[0057] Further, in combination with the above Figure 12 As shown in the drawings, the clamping structure 270 can be an elastic plug column 271 with a ball head 271a, and the clamping portion 232 is a groove or a boss with a groove. The elastic plug column 271 has a thread, and the spring plug is connected to the nut 270a and the side frame 260 by the thread. The ball head 271a is inserted into the groove, thereby achieving the relative fixation of the elastic plug column 271 and the rotating member 230. Under the action of external force, the rotating member 230 can be rotated with the gauge 100 by overcoming the cooperation force between the ball head 271a and the groove.

[0058] A gasket 270b is sleeved on the elastic plug column 271, and the gasket 270b is clamped between the nut and the side frame 260, thereby maintaining the stability of the connection between the elastic plug column 271 and the side frame 260 by the elastic force of the gasket 270b.

[0059] In some embodiments, the clamping structure 270 can also be a knob plug. The knob plug is used to cooperate with the groove on the rotating member 230 to lock the rotating member 230. When the gauge 100 needs to be rotated, the knob plug is screwed out of the groove, so that the rotating member 230 can continue to rotate with the gauge 100 relative to the side frame 260.

[0060] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0061] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A gauge for detecting the diameter of an external thread, characterized in that, The gauge comprises a plurality of sleeves arranged in sequence one inside another, each of the sleeves is provided with a threaded detection hole in a side wall thereof, adjacent sleeves can slide relative to each other to allow the inner sleeve to have an extended position and a retracted position relative to the outer sleeve, in the extended position, the threaded detection hole of the inner sleeve is exposed to the outer sleeve; the threaded detection hole of the outer sleeve has a larger diameter than the threaded detection hole of the inner sleeve; the inner sleeve is provided with a gage screw hole, the gage screw hole and the threaded detection hole of the outer sleeve correspond to the minimum limit size and the maximum limit size of the same standard thread respectively, in the extended position, the threaded detection hole of the outer sleeve is coaxial with the gage screw hole of the inner sleeve; the outer wall of the inner sleeve is provided with a sliding groove, the outer sleeve is provided with a limiting member matched with the sliding groove, when the outer sleeve and the inner sleeve slide relative to each other, the limiting member slides in the sliding groove, the farther end of the sliding groove from the threaded detection hole forms a first limiting part, in the extended position, the limiting member is matched with the first limiting part to limit the outward movement of the inner sleeve relative to the outer sleeve; the closer end of the sliding groove from the threaded detection hole forms a second limiting part, in the retracted position, the limiting member is matched with the second limiting part to limit the inward movement of the inner sleeve relative to the outer sleeve.

2. A gauge for detecting the diameter of an external thread according to claim 1, characterized in that, The inner sleeve is provided with a through hole, in the extended position, the projection of the threaded detection hole of the outer sleeve on the inner sleeve along the hole axis direction falls into the through hole; And / or, in the retracted position, the outer sleeve shields the threaded detection hole of the inner sleeve.

3. The gauge for detecting the outside thread diameter according to claim 1, wherein, The plurality of sleeves have the same cross-sectional shape.

4. The gauge for detecting the outside thread diameter according to claim 1, wherein, The inner wall of the sleeve has a plurality of side surfaces parallel to the axial direction thereof, and the plurality of side surfaces enclose a prism shape.

5. A gauge for detecting the diameter of an external thread according to claim 4, characterized in that, At least two side surfaces of the sleeve are provided with the threaded detection hole.

6. A gauge for detecting the diameter of an external thread according to claim 5, characterized in that, The threaded detection holes on different side surfaces have different diameters.

7. The gauge for detecting the outside thread diameter according to claim 1, wherein The depth of the two end positions of the sliding groove is greater than the depth of the middle position.

8. The gauge for detecting the outside thread diameter according to claim 1, wherein, The limiting member comprises a spring plunger and a ball head, the ball head is in elastic contact with the groove wall of the sliding groove under the driving of the spring plunger.

9. The gauge for detecting the outside thread diameter according to claim 1, wherein, In the retracted position, the end faces of the plurality of sleeves in the extended direction are flush.

10. A gauge for detecting the diameter of an external thread according to claim 1 or 9, characterized in that, The innermost sleeve is connected with a pull rod, the pull rod is used to drive the inner sleeve to make the extended movement relative to the outer sleeve under the action of an external force.

11. The gauge for detecting the outside thread diameter according to claim 1, wherein The hole axis of the threaded detection hole is arranged at an acute angle with the longitudinal axis of the sleeve.

12. The gauge for detecting the outside thread diameter according to claim 1, wherein, The hole axis of the threaded detection hole is perpendicular to the longitudinal axis of the sleeve.

13. The gauge for detecting the outside thread diameter according to claim 1, wherein, The angle between the hole axis of the threaded detection hole and the longitudinal axis of the sleeve ranges from 45° to 75°.

14. A detection device, characterized by The gauge comprises the gauge according to any one of claims 1-13.

15. The detection device of claim 14, wherein, The application relates to a gauge including a base, a support frame connected with the base, and a rotating member rotationally connected with the support frame, and the gauge is connected with the rotating member.

16. The detection device of claim 15, wherein, The rotating member is provided with a receiving cavity with an opening, a plurality of sleeves of the gauge can extend out of the receiving cavity from the opening and can be retracted into the receiving cavity.

17. The detection device of claim 16, wherein, An end face of one end of the rotating member close to the opening is provided with a mounting groove for detachably mounting a dust cover, when the dust cover cooperates with the mounting groove, the dust cover covers the opening. Alternatively, a soft cover is connected with one end of the rotating member close to the opening, the soft cover is divided into a plurality of blocking pieces by a radial partition groove along the middle part of the soft cover, when the sleeve extends out of the receiving cavity, the sleeve can push away the blocking pieces, and when the sleeve is retracted into the receiving cavity, the blocking pieces restore deformation to cover the opening.

18. The detection device according to claim 15 or 16, characterized in that The base is provided with a side frame and a clamping structure connected with the side frame, a circumferential side of the rotating member is provided with a plurality of spaced clamping portions, when the rotating member is rotated to a position where any one of the clamping portions is opposite to the clamping structure, the rotating member is limited in rotation by cooperation of the clamping structure and the clamping portion.

19. The detection device according to claim 15 or 16, characterized in that The base is provided with a side frame and a clamping structure connected with the side frame, a circumferential side of the rotating member is provided with a plurality of spaced clamping portions, when the rotating member is rotated to a position where any one of the clamping portions is opposite to the clamping structure, the rotating member is limited in rotation by cooperation of the clamping structure and the clamping portion.

20. The detection device of claim 15 or 16, wherein, A knob is arranged on a side of the rotating member away from the gauge, the knob is used to drive the rotating member to rotate relative to the support frame. A knob is arranged on a side of the rotating member away from the gauge, the knob is used to drive the rotating member to rotate relative to the support frame.

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