CN215864978U - Device for measuring effective length of internal thread of blind screw hole - Google Patents

Abstract

The utility model belongs to the technical field of machining detection, and particularly relates to a device for measuring the effective length of an internal thread of a blind screw hole, which aims to solve the technical problem that in the prior art, when the size of a workpiece is small, a sleeve is easy to move, so that the accuracy of a measuring result is poor. The measuring device comprises a sleeve, a first scale mark is arranged on the outer cylindrical surface of the sleeve, a measuring rod penetrates through the sleeve, and the front end and the rear end of the measuring rod extend to the outside of the sleeve; a micro-cylinder is fixedly sleeved at the rear end of the measuring rod and sleeved outside the sleeve, and a second scale mark is arranged on the outer cylindrical surface of the micro-cylinder; the front end of the measuring rod is provided with a standard gauge which is coaxially arranged with the measuring rod and the sleeve; the measuring rod is screwed in the inner hole of the sleeve; the outer diameter of the front end of the sleeve is larger than that of the standard gauge; the front end of the measuring rod penetrates out of the sleeve to form an annular reference surface at the front end of the sleeve, and the annular reference surface is used for being attached to the surface of a workpiece where the blind threads are located during measurement.

Description

Device for measuring effective length of internal thread of blind screw hole

Technical Field

The utility model belongs to the technical field of machining detection, and particularly relates to a device for measuring the effective length of an internal thread of a blind screw hole.

Background

The threaded connection is a detachable fixed connection mode, has the advantages of simple structure, reliable connection, convenient assembly and disassembly and the like, and is widely applied to the field of mechanical engineering. The thread is provided with an internal thread and an external thread, the external thread is distributed on the outer surface of the parent body, the internal thread is distributed in the parent body, and the sizes of the major diameter, the intermediate diameter, the minor diameter, the thread pitch and the like of the thread need to be measured when the fastener is machined.

When the effective length of the internal thread in the blind screw hole is actually measured, the internal thread is inside the parent body, so that the direct measurement in a projection mode cannot be adopted, the product needs to be cut open to measure under the projection, or a profile gauge is adopted to measure, the measuring process is complex, the production efficiency of the product is influenced, and the requirement of an actual production site cannot be met.

For this reason, chinese utility model patent that the grant bulletin number is CN203824461U discloses a blind screw internal screw thread precision and effective length's detection instrument, and this detection instrument utilizes micrometer's principle to measure blind screw internal screw thread effective length, including handheld frame, there is the reference surface handheld frame's front end, is fixed with the sleeve on the handheld frame, and telescopic outer cylinder has the first scale mark along its axial distribution, and the screw thread is equipped with the measuring stick in handheld frame, and the measuring stick rear end is fixed with the micro-cylinder, and the micro-cylinder cover is in telescopic outside, has the second scale mark along circumferential distribution on the micro-cylinder. A standard gauge (namely a thread go gauge in the patent) is fixed at the front end of the measuring rod, and the major diameter of the standard gauge is the same as the minimum major diameter of the internal thread of the blind screw hole to be measured. During the use, adjust the end face of standard rule front end earlier and handheld frame front end reference face parallel and level, at the measuring in-process, handheld frame front end reference face is pasting all the time and is being surveyed the workpiece surface, guarantees handheld frame and sleeve motionless, with the blind screw that awaits measuring of standard rule screw in, come the cooperation through first scale mark and second scale mark and read numerical value, just it revolves the end to twist to represent when the standard rule can't continue to revolve, the reading at this moment is effective length.

Utilize the principle of micrometer to measure blind screw internal thread effective length among the prior art, but the problem that exists lies in, has certain distance on horizontal between handheld frame front end reference surface and the standard gage, and when work piece size is less, handheld frame front end reference surface can't paste the work piece surface all the time in the measurement process, leads to the sleeve to be drunkenness around easily taking place when using, leads to the measuring result accuracy relatively poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for measuring the effective length of an internal thread of a blind screw hole, which aims to solve the technical problem that in the prior art, when the size of a workpiece is small, a sleeve is easy to move, so that the accuracy of a measuring result is poor.

In order to achieve the purpose, the technical scheme of the device for measuring the effective length of the internal thread of the blind screw hole provided by the utility model is as follows: a device for measuring the effective length of an internal thread in a blind screw hole, comprising:

the sleeve is provided with first scale marks distributed along the axial direction of the sleeve on the outer cylindrical surface;

the measuring rod penetrates through the sleeve, and the front end and the rear end of the measuring rod in the axial direction extend to the outside of the sleeve;

the micro-cylinder is fixedly sleeved at the rear end of the measuring rod and sleeved outside the sleeve, second scale marks distributed along the circumferential direction of the outer cylindrical surface of the micro-cylinder are arranged on the outer cylindrical surface of the micro-cylinder, and the second scale marks are matched with the first scale marks for reading;

the front end of the measuring rod is provided with a standard gauge which is coaxially arranged with the measuring rod and the sleeve, and the standard gauge is used for penetrating into the blind thread; the measuring rod is screwed in the inner hole of the sleeve, and the rotating micro-cylinder can drive the measuring rod to rotate and move forwards;

the outer diameter of the front end of the sleeve is larger than that of the standard gauge;

the front end of the measuring rod penetrates out of the sleeve to form an annular reference surface at the front end of the sleeve, and the annular reference surface is used for being attached to the surface of a workpiece where the blind threads are located during measurement.

Has the advantages that: according to the utility model, the measuring rod is screwed in the inner hole of the sleeve, and the standard gauge is arranged at the front end of the measuring rod, so that the standard gauge is screwed into the blind screw hole to be measured, and the purpose of measuring the effective length of the internal thread of the blind screw is achieved. Because the annular datum plane is formed on the end face of the front end of the sleeve, and is in coaxial arrangement with the measuring rod and the standard gauge, the annular datum plane can be attached to the workpiece even if the size of the workpiece is small, the annular datum plane is suitable for measuring the workpiece with the small size, and the condition that the workpiece is inaccurate when being small in the prior art is avoided.

Preferably, the front end of the sleeve is provided with anti-slip lines. The anti-slip lines are arranged at the front end of the sleeve, so that a detector can hold the sleeve when the sleeve is used, and the operating force is reduced.

Preferably, the sleeve comprises a large-diameter section at the front end and a small-diameter section behind the large-diameter section, the first scale marks are arranged on the small-diameter section, and the anti-skid grains are arranged on the large-diameter section. Because antiskid lines and the first scale marks are respectively arranged on the large-diameter section and the small-diameter section, only the machining precision of the small-diameter section needs to be ensured during machining, and for the large-diameter section, the antiskid lines need to be arranged outside the large-diameter section, so that the machining precision can be properly reduced, and the overall machining cost is reduced.

Preferably, the outer cylindrical surface of the micro-cylinder is provided with anti-slip grains behind the second scale mark. When in use, the screw is screwed and held by a detector, so that the screwing friction force is increased.

Preferably, the anti-slip thread on the micro-cartridge is located on the rear part of the micro-cartridge.

Preferably, the rear end of the measuring rod is connected with a driving ratchet wheel. The ratchet wheel is driven to ensure that the measuring results of all testers are kept consistent.

Preferably, the measuring rod and the standard gauge are detachably assembled together in a split manner. The standard gauge can be replaced according to different workpieces, the measuring range is wider, and the universality is stronger.

Preferably, the front end of the measuring rod penetrates into the standard gauge and is in threaded fit with the standard gauge.

Preferably, the sleeve body is sleeved at the front end of the sleeve in a split manner, the front end of the sleeve body is flush with the front end of the sleeve, and anti-skid grains are arranged outside the sleeve body. The sleeve body protecting sleeve is durable in use, the front end of the sleeve body is flush with the front end of the sleeve, the area of the annular reference surface is increased, and the sleeve body protecting sleeve is more stably attached to a workpiece.

Preferably, the micro-cylinder is separately sleeved with a sleeve body, and the sleeve body is provided with anti-skid grains. Through setting up the cover body, the protection micro-cylinder is direct not contact with operator's human body, protects measuring device, and it is durable to increase the use.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment 1 of a device for measuring an effective length of an internal thread of a blind screw hole provided by the utility model;

FIG. 2 is a schematic view of an embodiment 1 of the device for measuring the effective length of the internal thread of the blind screw hole provided by the utility model in use;

description of reference numerals:

1. a sleeve; 2. a first scale mark; 3. a measuring rod; 4. a micro-drum; 5. a second scale mark; 6. driving the ratchet wheel; 7. a standard gauge; 8. a first anti-skid pattern; 9. a second anti-skid pattern; 10. an annular reference surface; 11. a workpiece; 12. blind screw holes; 101. a small diameter section; 102. a large diameter section.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.

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

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

The specific embodiment 1 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, is as follows:

as shown in fig. 1, the measuring device for the effective length of the blind screw internal thread (hereinafter, simply referred to as measuring device) is designed based on the measurement principle of a micrometer, and can be applied to the measurement of the effective length of the blind screw internal thread in a workpiece with a small size.

The measuring device comprises a sleeve 1, the axial direction of the sleeve 1 is defined as the front-back direction, and the sleeve 1 comprises a large-diameter section 102 at the front end and a small-diameter section 101 behind the large-diameter section 102. The outer cylindrical surface of the large-diameter section 102 is carved with first anti-skid grains 8; the outer cylindrical surface of the small-diameter section 101 is provided with first scale marks 2, the first scale marks 2 are distributed along the axial direction of the sleeve 1, and an internal thread is arranged inside the sleeve 1. The measuring rod 3 penetrates through the inner portion of the sleeve 1, external threads are arranged on the outer portion of the measuring rod 3, the measuring rod 3 and the sleeve 1 are connected in a screwed mode, and the measuring rod 3 can move back and forth when the measuring rod 3 is rotated. Wherein, the length of measuring stick 3 is greater than the length of sleeve 1, and preceding, the back both ends of measuring stick 3 all are located the outside of sleeve 1 moreover. The rear end of measuring stick 3 is fixed with micro-section of thick bamboo 4, and it is together fixed specifically to adopt welding or interference fit's mode between measuring stick 3 and the micro-section of thick bamboo 4, and simultaneously, micro-section of thick bamboo 4 cover is in the outside of sleeve 1 rear end, and the front end of micro-section of thick bamboo 4 has second scale mark 5, and second scale mark 5 distributes along the circumference of micro-section of thick bamboo 4, during the measurement, reads numerical value through the cooperation of first scale mark 2, second scale mark 5. A driving ratchet 6 is also connected to the rear end of the measuring rod 3. And a second antiskid stripe 9 is carved at the position close to the rear part of the middle part of the micro-cylinder 4. The structure and the use mode of the sleeve 1, the micro-cylinder 4, the measuring rod 3 and the driving ratchet 6 are the same as those of a micrometer in the prior art, and the description is omitted.

The front end of the measuring rod 3 is provided with a standard gauge 7, the standard gauge 7 is in threaded connection with the measuring rod 3, and the outer part of the front end of the measuring rod 3 and the rear end of the standard gauge 7 are both provided with threads and connected. And an external thread is arranged outside the standard gauge 7, and the size of the major diameter of the external thread is the same as the minimum major diameter of the internal thread of the blind screw hole to be detected. Due to the fact that the standard gauge 7 is in threaded connection with the measuring rod 3, in actual use, a proper standard gauge is selected according to the size of the inner thread of the blind screw hole to be measured, and assembling is conducted. The outer diameter of the standard gauge 7 is smaller than the outer diameter of the front end of the sleeve 1, and the outer diameter of the standard gauge 7 is larger than the outer diameter of the measuring rod 3. When the standard gauge 7 is screwed into the blind screw hole to be measured in actual measurement, the measuring rod 3 penetrates out from the front end of the sleeve 1, so that an annular reference surface 10 is formed at the front end of the sleeve 1, the annular reference surface 10 can be attached to the surface of a workpiece where the blind screw hole to be measured is located, and can also be attached to the rear end face of the standard gauge 7 before measurement, so that the measurement and the zero setting of the measuring device are performed.

The using process of the utility model is as follows: before measurement, according to the size of the internal thread of the blind screw hole to be measured, the selected adaptive standard gauge 7 is screwed with the front end of the measuring rod 3, so that reliable connection and stable matching are ensured.

Zero setting before measurement: rotating the micro-drum 4 to move the standard gauge 7 backwards until the rear end face of the standard gauge 7 is attached to the annular reference surface 10 at the front end of the sleeve 1, namely the rear end face of the standard gauge and the annular reference surface 10 are in the same plane, and then carrying out zero setting treatment.

The measurement process comprises the following steps: after the zero setting of the measuring device is finished, a detector holds the positions of the first anti-skid grains 8 and the second anti-skid grains 9 at the same time, the measuring device is integrally screwed into a blind screw hole 12 to be measured of a workpiece 11, and the rear end face of the standard gauge 7 is always attached to the annular reference surface 10 during screwing. As shown in fig. 2, after the annular reference surface 10 is attached to the surface of the workpiece, the inspector holds the position of the first anti-slip pattern 8 with one hand and ensures that the annular reference surface 10 is attached to the surface of the workpiece, the sleeve 1 cannot move in the front-back direction, and the second anti-slip pattern 9 is rotated with the other hand, so that the standard gauge 7 is independently rotated and moved forward relative to the sleeve 1 until the standard gauge 7 reaches the bottom of the threaded hole, and when the micro-cylinder 4 cannot be rotated any more, the inspector rotates the driving ratchet 6 until the driving ratchet 6 makes a sound to idle. At the moment, the first scale mark 2 and the second scale mark 5 are matched for reading, and the read numerical value and the axial length of the standard gauge 7 are the effective length of the internal thread of the blind screw hole to be measured.

In the embodiment 1, the length specification of the standard gauge 7 is known, the axial length can be measured, and the length and the outer diameter of the standard gauge can be automatically measured and verified to be qualified before the standard gauge of the measuring device is installed.

In embodiment 1, the connection mode between the standard gauge 7 and the measuring rod 3, and between the measuring rod 3 and the sleeve body 1 are both in threaded connection, so that the standard gauge 7 and the measuring rod 3 can be detached, and are convenient to replace, disassemble and store.

The specific embodiment 2 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, comprises the following steps:

the difference with embodiment 1 is that, in embodiment 1, the measuring rod and the standard gauge are detachably connected in a split manner by a threaded connection, in this embodiment, in order to realize the detachable connection between the measuring rod and the standard gauge, the measuring rod and the standard gauge are assembled in an interference insertion manner, specifically, an unthreaded hole is formed in the rear end of the standard gauge, and the measuring rod is inserted into the unthreaded hole in an interference insertion manner.

The specific embodiment 3 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, is as follows:

the difference from the embodiment 1 is that in the embodiment 1, the measuring rod and the standard gauge are connected in a split manner. In this embodiment, the measuring rod and the standard gauge are fixed together by welding. In other embodiments, the measuring rod and the standard gauge can be fixed together in an adhesive manner, or in other embodiments, the measuring rod and the standard gauge can be integrally formed.

The specific embodiment 4 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, is as follows:

the difference from embodiment 1 is that in embodiment 1, a drive ratchet is connected to the rear end of the measuring rod. In this embodiment, the drive ratchet is eliminated and the measuring rod is directly operated. In other embodiments, the drive ratchet may be replaced with a drive handle.

The specific embodiment 5 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, is as follows:

the difference from the embodiment 1 is that in the embodiment 1, the rear end cylindrical surface of the micro-cylinder 4 is carved with the anti-skid thread, and in the embodiment, the anti-skid thread carved on the micro-cylinder is at any position of the front end or the middle section of the micro-cylinder. In other embodiments, the micro-drum is not provided with anti-skid stripes, and the detector can directly hold the micro-drum to operate and rotate at any position.

The specific embodiment 6 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, is as follows:

the difference from the embodiment 1 is that in the embodiment 1, the cylindrical surface of the rear end of the middle part of the micro-cylinder 4 is carved with the anti-skid veins, in the embodiment, the rear section of the micro-cylinder is separately sleeved with the sleeve body, and the sleeve body is provided with the anti-skid veins. The sleeve body and the micro-cylinder can be in interference fit or in a bonding connection mode.

The specific embodiment 7 of the device for measuring the effective length of the internal thread of the blind screw hole, provided by the utility model, is as follows:

the difference from embodiment 1 is that in embodiment 1, the sleeve is divided into a large-diameter section 102 and a small-diameter section 101. In this embodiment, the overall diameter of the sleeve is the same from front to back, and is of an equal diameter structure, and a sleeve body is separately arranged at the front end port of the sleeve, anti-skid grains are arranged outside the sleeve body, and the sleeve body and the sleeve can adopt an interference fit or gluing connection mode. In other embodiments, the constant-diameter sleeve can be directly provided with anti-slip grains on the front end cylindrical surface. In other embodiments, the cylindrical surface at the front end of the sleeve does not have anti-slip lines, and a detector can directly hold the sleeve body of the sleeve.

Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A device for measuring the effective length of an internal thread in a blind screw hole, comprising:

the sleeve comprises a sleeve (1), wherein first scale marks (2) distributed along the axial direction of the sleeve are arranged on the outer cylindrical surface;

the measuring rod (3) penetrates through the sleeve (1), and the front end and the rear end of the measuring rod (3) in the axial direction both extend to the outside of the sleeve (1);

the micro-cylinder (4) is fixedly sleeved at the rear end of the measuring rod (3), the micro-cylinder (4) is sleeved outside the sleeve (1), second scale marks (5) distributed along the circumferential direction of the outer cylindrical surface of the micro-cylinder (4) are arranged on the outer cylindrical surface of the micro-cylinder (4), and the second scale marks (5) are matched with the first scale marks (2) for reading;

the front end of the measuring rod (3) is provided with a standard gauge (7), the standard gauge (7) and the sleeve (1) are coaxially arranged, and the standard gauge (7) is used for penetrating into a blind screw hole (12);

the method is characterized in that: the measuring rod (3) is in threaded connection with an inner hole of the sleeve (1), and the micro-cylinder (4) can be driven to rotate and move forwards by rotating the measuring rod (3);

the outer diameter of the front end of the sleeve (1) is larger than that of the standard gauge (7);

the front end of the measuring rod (3) penetrates out of the sleeve (1) so as to form an annular reference surface (10) at the front end of the sleeve (1), and the annular reference surface (10) is used for being attached to the surface of a workpiece (11) where the blind screw hole (12) is located during measurement.

2. The apparatus for measuring the effective length of the internal thread of the blind screw hole according to claim 1, wherein: the front end of the sleeve (1) is provided with anti-skid grains.

3. The apparatus for measuring the effective length of the internal thread of the blind screw hole according to claim 2, wherein: the sleeve (1) comprises a large-diameter section (102) at the front end and a small-diameter section (101) located behind the large-diameter section (102), the first scale marks (2) are arranged on the small-diameter section (101), and the anti-skid lines are arranged on the large-diameter section (102).

4. The device for measuring the effective length of the internal thread of the blind screw hole according to any one of the claims 1 to 3, wherein: and anti-skid grains are arranged on the outer cylindrical surface of the micro-cylinder (4) behind the second scale marks (5).

5. The device for measuring the effective length of the internal thread of the blind screw hole as claimed in claim 4, wherein: the antiskid lines on the micro-drum (4) are positioned on the rear part of the micro-drum (4).

6. The device for measuring the effective length of the internal thread of the blind screw hole according to any one of the claims 1 to 3, wherein: the rear end of the measuring rod (3) is connected with a driving ratchet wheel (6).

7. The device for measuring the effective length of the internal thread of the blind screw hole according to any one of the claims 1 to 3, wherein: the measuring rod (3) and the standard gauge (7) are detachably assembled together in a split manner.

8. The apparatus for measuring the effective length of the internal thread of the blind screw hole according to claim 7, wherein: the front end of the measuring rod (3) penetrates into the standard gauge (7) and is in threaded fit with the standard gauge (7).

9. The apparatus for measuring the effective length of the internal thread of the blind screw hole according to claim 1, wherein: the sleeve is characterized in that the front end of the sleeve (1) is sleeved with a sleeve body in a split manner, the front end of the sleeve body is flush with the front end of the sleeve (1), and anti-skid grains are arranged outside the sleeve body.

10. The apparatus for measuring the effective length of the internal thread of the blind screw hole according to claim 1, wherein: the micro-cylinder (4) is separately sleeved with a sleeve body, and the sleeve body is provided with anti-skid grains.

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