CN217585550U

CN217585550U - Thread detection machine

Info

Publication number: CN217585550U
Application number: CN202221211801.9U
Authority: CN
Inventors: 赵鹏
Original assignee: Hangzhou Mizhiwei Automation Technology Co ltd
Current assignee: Hangzhou Mizhiwei Automation Technology Co ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-10-14
Anticipated expiration: 2032-05-18

Abstract

The utility model discloses a thread detection machine, which belongs to the thread detection field and comprises a workbench, a reciprocating driving mechanism vertically arranged on the workbench, an actuator arranged on the output end of the reciprocating driving mechanism, and a thread gauge connected with the output end of the actuator; still be provided with self-aligning mechanism on the workstation, self-aligning mechanism is located the thread gauge under, and self-aligning mechanism includes stopper and movable block, and the top surface of stopper is provided with the recess, and the movable block is placed in the recess, and the top surface of movable block is equipped with the frock seat that is used for fixing a position the work piece that awaits measuring, and wherein, has the clearance between the circumference outer wall of movable block and the circumference inner wall of recess, still is equipped with between movable block and the stopper to be used for preventing the rotatory anti-rotation structure of movable block. The utility model has the advantages of simple structure and reasonable design, can be in the testing process automatic elimination disalignment problem to compensate effectively and await measuring the disalignment (eccentric) volume between footpath central line and the thread gauge in the screw thread of work piece.

Description

Thread detection machine

Technical Field

The utility model relates to a technical field, in particular to screw thread detects machine is measured to the screw thread.

Background

In the field of machining, threaded connection is one of important modes of fixed connection, and threaded connection usually needs comprehensive detection on thread parameters before a product is manufactured and used so as to determine whether manufacturing accuracy reaches the standard and whether the threaded connection is used.

The thread gauge is a detection tool for detecting whether threads are qualified or not, and comprises a thread plug gauge (used for detecting internal threads) and a thread ring gauge (used for detecting external threads). When the threaded workpiece with the threads is detected, the corresponding thread gauge is screwed with the threads of the threaded workpiece, and when the threaded workpiece is used, whether the threaded workpiece is qualified or not is determined by judging whether the threaded workpiece can be screwed into the thread gauge or not.

In the conventional technology, the operation of detecting the threaded workpiece by using a thread gauge is usually completed manually, which not only causes high labor cost, but also is difficult to perform large-batch threaded workpiece detection operation, so that the thread detection efficiency is difficult to improve. In order to solve the problem, at present, machines such as a motor and the like are used for driving a thread gauge to rotate, so that only the thread of a workpiece to be detected is operated to align with the rotating thread gauge and be screwed with the rotating thread gauge, whether the thread on the workpiece is qualified or not is judged by judging the condition that the thread gauge is screwed into the workpiece, namely, the thread on the workpiece is unqualified when the thread gauge and the workpiece cannot be screwed smoothly.

Under above-mentioned detection mode, the work piece that awaits measuring can appear the deviation when fixing a position, leads to screw thread and screw thread rule decentraction on it, when carrying out screw thread detection under this condition, then can appear the effort of deviating from between screw thread rule and the work piece that awaits measuring to lead to the screw thread rule impaired or the testing result inaccurate, even detect the work and normally go on.

SUMMERY OF THE UTILITY MODEL

Screw thread and the condition of screw thread rule decentraction on the work piece that awaits measuring appear easily in the screw thread testing process to prior art existence, and then lead to the impaired problem of screw thread rule, the utility model aims to provide a screw thread detects machine.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a thread detection machine comprises a workbench, a reciprocating driving mechanism vertically arranged on the workbench, an actuator arranged on the output end of the reciprocating driving mechanism, and a thread gauge connected with the output end of the actuator; still be provided with from aligning mechanism on the workstation, from aligning mechanism is located under the thread gauge, from aligning mechanism includes stopper and movable block, the top surface of stopper is provided with the recess, the movable block place in the recess, just the top surface of movable block is provided with the frock seat that is used for fixing a position the work piece that awaits measuring, wherein, the circumference outer wall of movable block with the clearance has between the circumference inner wall of recess, just the movable block with still be provided with between the stopper and be used for preventing the rotatory anti-rotation structure of movable block.

Preferably, a plurality of balls are placed at the bottom of the groove, a movable plate is placed above the balls, and the movable block is arranged on the movable plate.

Preferably, the anti-rotation structure comprises a plurality of positioning screw holes uniformly formed in the circumferential side wall of the limiting block, the positioning screw holes are communicated with the grooves, and set screws are screwed in the positioning screw holes; and the circumferential outer wall of the movable block, which is opposite to each set screw, is correspondingly provided with a movable hole, and the diameter of the movable hole is greater than that of the set screw.

Furthermore, a movement mechanism is also arranged on the output end of the actuator; the motion mechanism comprises a rotating shaft which is in a hollow structure and a sliding shaft which is coaxially arranged in the rotating shaft, the rotating shaft is coaxially and fixedly connected to the output end of the actuator, and the sliding shaft is in sliding connection with the rotating shaft along the axial direction of the sliding shaft; one end of the sliding shaft, facing the actuator, is connected with the rotating shaft through a spring, and the spring provides elastic force for preventing the sliding shaft from moving towards the actuator; the thread gauge is coaxially and fixedly connected to one end, away from the actuator, of the sliding shaft, and a measuring portion of the thread gauge extends out of the rotating shaft.

Preferably, a radial pin shaft perpendicular to the axis of the sliding shaft is fixedly mounted on the sliding shaft, and two guide grooves for allowing two ends of the radial pin shaft to slide are formed in the side wall of the rotating shaft in a central symmetry manner.

Preferably, first rolling bearings are mounted at two ends of the radial pin shaft to reduce friction.

Preferably, a stepped hole is formed in the inner wall of the rotating shaft, a linear bearing matched with the sliding shaft is installed in the stepped hole, and a first clamp spring used for limiting the linear bearing is further installed on the stepped hole.

The workbench is fixedly connected with the rotating shaft, and the rotating shaft is sleeved with the outer shell; the two ends of the shell are respectively provided with a bearing step, a second rolling bearing matched with the rotating shaft is installed in the bearing steps, and a second clamping spring used for limiting the second rolling bearing is further arranged on the bearing steps.

Preferably, the thread gauge comprises a detection part for detecting the thread and a connecting rod connected with the detection part; still including changing the piece, it is coaxial form ground fixed connection to change the piece be the sliding shaft deviates from the one end of executor, the connecting rod of screw thread gauge can be dismantled the connection and be in change on the piece.

Preferably, an installation groove with a non-circular cross section is formed in the replacing part, and a torsion structure matched with the installation groove is arranged at the end part of the connecting rod; still be provided with the spring locating pin in changing the piece, be provided with correspondingly on the lateral wall of connecting rod with the positioning ring groove of spring locating pin looks adaptation.

Adopt above-mentioned technical scheme, the beneficial effects of the utility model reside in that: due to the arrangement of the self-centering mechanism, when the thread gauge and the thread of the workpiece to be measured are not concentric, the thread gauge and the thread to be measured are mutually screwed to generate a deviation acting force, and the deviation acting force can drive the movable block to move in the groove on the limiting block, so that the movable block moves to the position where the thread of the workpiece to be measured and the thread gauge are concentric, the deviation acting force is eliminated, and the thread gauge is effectively protected; in addition, due to the arrangement of the anti-rotation structure, the movable block can be effectively prevented from rotating in the thread detection process.

Drawings

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic structural view of the self-aligning mechanism of the present invention;

FIG. 3 is a schematic view of the connection structure of the middle motion mechanism and the thread plug gauge of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

fig. 5 is a schematic structural view of the connection between the middle moving mechanism and the thread ring gauge of the present invention.

In the drawing, 1-a workbench, 2-a reciprocating driving mechanism, 3-an actuator, 31-a connecting disc, 4-a thread gauge, 41-a detection part, 42-a connecting rod, 5-a self-aligning mechanism, 51-a limiting block, 52-a movable block, 53-a tool seat, 54-balls, 55-a movable plate, 56-a positioning screw hole, 57-a set screw, 58-a movable hole, 6-a rotating shaft, 7-a sliding shaft, 8-a radial pin shaft, 9-a guide groove, 10-a spring, 11-a first rolling bearing, 12-a linear bearing, 13-a first snap spring, 14-a shell, 15-a second rolling bearing, 16-a second snap spring, 17-a replacement part and 18-a spring positioning pin.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or position relationship of the structure of the present invention based on the drawings, and are only for the convenience of describing the present invention, 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.

In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.

In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood in relation to the present scheme in specific terms according to the general idea of the present invention.

Example one

A thread detection machine comprises a workbench 1, a reciprocating driving mechanism 2 vertically installed on the workbench 1, an actuator 3 installed on the output end of the reciprocating driving mechanism 2, and a thread gauge 4 connected with the output end of the actuator 3, as shown in figure 1. Wherein, the thread gauge 4 is not limited to be the external thread gauge that is used for detecting the external screw thread or is used for detecting the internal thread gauge, during the use with the thread gauge 4 of different grade type and specification fix the output at executor 3 as required can to constitute corresponding external screw thread detection machine or internal thread detection machine.

Wherein the worktable 1 is configured into an L-shaped structure, the vertical surface of the worktable is used for installing the reciprocating driving mechanism 2, and the plane of the worktable is used for installing the self-aligning mechanism 5. The reciprocating driving mechanism 2 can be configured as an air cylinder or an electric push rod; the actuator 3 is configured as a motor, and preferably a geared motor, and the output shaft of the motor is also arranged vertically.

Meanwhile, the workbench 1 is further provided with a self-aligning mechanism 5, the self-aligning mechanism 5 is located under the thread gauge 4, as shown in fig. 2, the self-aligning mechanism 5 comprises a limiting block 51 and a movable block 52, the top surface of the limiting block 51 is provided with a groove for placing the limiting block movable block 52, the movable block 52 is placed in the groove, and a movable gap is formed between the circumferential outer wall of the movable block 52 and the circumferential inner wall of the groove, so that the movable block 52 can move therein. The top surface of the movable block 52 is provided with a tool seat 53, such as a clamping cylinder, for positioning a workpiece to be measured. In other preferred embodiments, or when the circumferential side wall of the workpiece to be measured has a non-circular cross section, the tool seat 53 only needs to be configured as a slot adapted to the shape of the workpiece to be measured to prevent the workpiece from rotating.

In order to allow the movable block 52 to move in the groove in all directions, the circumferential inner wall on which the groove is disposed and the circumferential outer wall of the movable block 52 are both circular. And the bottom surface of the movable block 52 and the groove bottom of the groove are planes perpendicular to the respective axes.

It can be understood that, in order to reduce the friction force when the movable block 52 moves in the groove, a plurality of balls 54 are further placed at the bottom of the groove, a movable plate 55 is placed above the balls 54, the movable block 52 is placed on the movable plate 55, and the movable block 52 is fixed on the movable plate 55 by welding or screw connection.

In addition, in order to prevent the movable block 52 from generating the following rotary motion in the groove in the detection process, in this embodiment, a rotation preventing mechanism for preventing the movable block 52 from rotating is further provided between the movable block 52 and the limiting block 51. For example, the rotation preventing structure includes a plurality of positioning screw holes 56, for example, 3, uniformly opened in the circumferential side wall of the stopper 51, the positioning screw holes 56 each communicating with the groove, and the positioning screw holes 56 each having a set screw 57 screwed therein. And the same number of movable holes 58 are correspondingly provided on the circumferential outer wall of the movable block 52 opposite to each set screw 57, and the diameter of the movable hole 58 is larger than that of the set screw 57. So set up, on the one hand when set screw 57 stretches into activity hole 58, then movable block 52 can't rotate in the recess, on the other hand because the diameter of activity hole 58 is greater than the setting of the diameter of set screw 57 for movable block 52 still has the ability of carrying out the free activity in certain extent in the recess. Or in other preferred embodiments, it is also possible to configure the circumferential outer wall of the movable block 52 and the circumferential inner wall of the groove to be non-circular, such as square or triangular, etc., so as to restrict the rotation of the movable block 52 by means of the shape configuration.

The utility model discloses a theory of operation does: after the workpiece to be measured is clamped and positioned by the tool seat 53, the actuator 3 is started, the actuator 3 drives the thread gauge 4 to rotate, and then the actuator 3 is driven to descend by the reciprocating driving mechanism 2 until the thread gauge 4 is contacted with the thread on the workpiece to be measured; because frock seat 53 positioning accuracy's reason, when the circumstances of decentraction appears with thread gauge 4 in the screw thread on the work piece that awaits measuring, thread gauge 4 can apply certain erroneous tendency effort to the work piece that awaits measuring, under the drive of this erroneous tendency effort, movable block 52 can be at the recess internal motion on stopper 51, the result of its motion tends to make the screw thread on the work piece that awaits measuring and thread gauge 4 concentric relative, thereby eliminate erroneous tendency effort between the two, and then avoid the thread gauge 4 damage circumstances appearance that leads to because the position location problem of the work piece that awaits measuring to appear.

Example two

In this embodiment, a moving mechanism is further disposed at the output end of the actuator 3, and the thread gauge 4 is mounted on the moving mechanism, and the moving mechanism is used for protecting the thread gauge 4 when the axial acting force between the thread gauge 4 and the workpiece to be measured is too large.

As shown in fig. 3 and 4, the moving mechanism includes a rotating shaft 6 and a sliding shaft 7. Wherein, the rotating shaft 6 is hollow, the rotating shaft 6 is coaxially and fixedly connected with the output end of the actuator 3, for example, a connecting disc 31 is fixed on the output shaft of the actuator 3 by a key or welding way, and the upper end part of the rotating shaft 6 is fixedly connected with the connecting disc 31 by a screw; or in other embodiments the upper end of the rotating shaft 6 is directly keyed onto the output of the actuator 3. The slide shaft 7 is coaxially arranged within the hollow structure of the rotary shaft 6, and in addition, the slide shaft 7 is slidably connected to the rotary shaft 6 in the axial direction thereof. In this embodiment, specifically, a shaft hole perpendicular to the axis of the sliding shaft 7 is formed in the sliding shaft 7, a radial pin 8 is installed in the shaft hole, two ends of the radial pin 8 protrude outside the sliding shaft 7, two guide grooves 9 are formed in the side wall of the rotating shaft 6 in a centrosymmetric manner, and two ends of the radial pin 8 respectively extend into the two guide grooves 9, so that the sliding shaft 7 slides relative to the rotating shaft 6 along the axial direction thereof under the constraint action of the radial pin 8 and the guide grooves 9.

The end (upper end) of the slide shaft 7 facing the actuator 3 is connected to the rotary shaft 6 via a spring 10, for example, the lower end of the spring 10 abuts against the upper end of the slide shaft 7, and the upper end of the spring 10 abuts against a circlip provided on the upper portion of the inner wall of the rotary shaft 6. The spring 10 is configured as a helical compression spring, and the spring 10 provides an elastic force for preventing the slide shaft 7 from moving toward the actuator 3.

The thread gauge 4 includes an external thread gauge and an internal thread gauge, which are either welded or bonded together and coaxially fixed to an end (lower end) of the sliding shaft 7 away from the actuator 3, and is adapted to extend a measuring portion of the thread gauge 4 to the outside of the rotating shaft 6 in the length dimension configuration of each part, so as to detect the thread on the workpiece to be measured.

The utility model discloses a theory of operation does: the actuator 3 is started, the output end of the actuator 3 drives the rotating shaft 6 to rotate, the sliding shaft 7 positioned in the rotating shaft 6 synchronously rotates under the restraint of the radial pin shaft 8 and the guide groove 9, when the thread of the workpiece to be tested is in screwing operation with the thread gauge 4, the thread can be smoothly screwed together if the thread specifications of the workpiece to be tested are matched, clamping stagnation can be generated if the thread specifications of the workpiece to be tested are not matched, after the clamping stagnation acting force is transmitted to the sliding shaft 7 through the thread gauge 4, the sliding shaft 7 overcomes the elastic force of the spring 10 and slides towards one side of the actuator 3, namely, the sliding shaft 7 drives the thread gauge 4 to be tested to be far away from the workpiece to be tested below, so that the clamping stagnation acting force cannot be increased without an upper limit, the upper limit of the clamping stagnation acting force is limited through the preset elastic force of the spring 10, and therefore the threads on the thread gauge 4 and the workpiece to be tested are effectively protected.

EXAMPLE III

In this embodiment, the first rolling bearings 11 are installed at both ends of the radial pin 8, and the diameter of the first rolling bearings 11 is adapted to the width of the guide groove 9, so that when the sliding shaft 7 moves axially, sliding is replaced by rolling, and thus the friction force between the sliding shaft 7 and the rotating shaft 6 is reduced.

Example four

In this embodiment, a stepped hole is formed in the inner wall where the rotating shaft 6 is disposed, the stepped hole is disposed below the guide groove 9, a linear bearing 12 adapted to the sliding shaft 7 is installed in the stepped hole, and a first snap spring 13 for axially limiting the linear bearing 12 is also installed in the stepped hole.

With such an arrangement, on the one hand, the linear bearing 12 keeps the axis of the sliding shaft 7 stable, and prevents the sliding shaft 7 from swinging during rotation, and in addition, the linear bearing 12 can also reduce the friction force on the sliding shaft 7.

EXAMPLE five

In this embodiment, a housing 14 is fitted around the outer side of the rotary shaft 6, and the housing 14 is fixedly attached to the table 1 by means of screws or screws, so that the rotary shaft 6 is protected by the housing 14.

In another preferred embodiment, the housing 14 is arranged coaxially with the rotating shaft 6, and two ends of the housing 14 are respectively provided with a bearing step, a second rolling bearing 15 adapted to the rotating shaft 6 is installed in the bearing step, and a second snap spring 16 for limiting the second rolling bearing 15 is also arranged on the inner wall of the bearing step. With this arrangement, on the one hand, the second rolling bearing 15 keeps the axis of the rotating shaft 6 stable, and prevents the rocking during the rotation, and in addition, the second rolling bearing 15 can also reduce the friction force against the rotating shaft 6. Further, by providing the housing 14, the weight of the motion mechanism is borne by the housing 14, and the load on the actuator 3 is reduced.

Example six

In the present embodiment, the thread gauge 4 includes a detection portion 41 for detecting a thread and a connection rod 42 connected to the detection portion 41. As shown in fig. 3 and 4, the plug screw gauge for detecting the female screw hole generally has a detecting portion 41 and a connecting rod 42, which are not described in detail in this embodiment; however, as for the thread ring gauge for detecting the external thread, it usually has only the detecting portion 41, and therefore in this embodiment, the connecting rod 42 is also mounted thereto by welding on the detecting portion 41 thereof, so that the two thread gauges have similar structures, and it is understood that the thread gauges 4 for detecting different types and sizes have the same connecting rod 42, except that the detecting portion 41 is different, as shown in fig. 5.

A replacement part 17, for example, a pin connection or a key connection, is also coaxially and fixedly connected to an end (lower end) of the slide shaft 7 facing away from the actuator 3. The lower end of the replacement part 17 is provided with a hole-shaped structure for the connecting rod 42 to penetrate into and realize fixation, the cross section of the hole bottom of the hole-shaped structure is provided with a non-circular mounting groove, and the free end part of the corresponding connecting rod 42 is provided with a torsion structure matched with the mounting groove, such as a half moon shape or a square shape. In addition, the inner wall of the hole-shaped structure is further provided with a spring positioning pin 18 arranged along the radial direction thereof, and correspondingly, the side wall of the connecting rod 42 is correspondingly provided with a positioning ring groove matched with the spring positioning pin 18.

So set up for thread gauge 4 when needs are changed, only need overcome spring locating pin 18's elasticity at external force and make it retract to change in the piece 17 after, can take out thread gauge 4's connecting rod 42, change new thread gauge 4 after, its connecting rod 42 stretches into in changing the poroid structure of piece 17, carry out axial positioning to it by spring locating pin 18, realize the transmission of torsional moment by mounting groove and torsion structure, thereby realize normal use.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a screw thread detects machine which characterized in that: the thread gauge comprises a workbench, a reciprocating driving mechanism vertically arranged on the workbench, an actuator arranged on the output end of the reciprocating driving mechanism, and a thread gauge connected with the output end of the actuator; still be provided with from aligning mechanism on the workstation, from aligning mechanism is located under the thread gauge, from aligning mechanism includes stopper and movable block, the top surface of stopper is provided with the recess, the movable block place in the recess, just the top surface of movable block is provided with the frock seat that is used for fixing a position the work piece that awaits measuring, wherein, the circumference outer wall of movable block with the clearance has between the circumference inner wall of recess, just the movable block with still be provided with between the stopper and be used for preventing the rotatory anti-rotation structure of movable block.

2. The thread testing machine of claim 1, wherein: a plurality of balls are placed at the bottom of the groove, a movable plate is placed above the balls, and the movable block is arranged on the movable plate.

3. The thread sensing machine of claim 1, wherein: the anti-rotation structure comprises a plurality of positioning screw holes uniformly formed in the circumferential side wall of the limiting block, the positioning screw holes are communicated with the grooves, and set screws are screwed in the positioning screw holes; and movable holes are correspondingly arranged on the circumferential outer wall of the movable block opposite to the set screws, and the diameter of each movable hole is larger than that of each set screw.

4. The thread testing machine of claim 1, wherein: the output end of the actuator is also provided with a movement mechanism; the motion mechanism comprises a rotating shaft which is in a hollow structure and a sliding shaft which is coaxially arranged in the rotating shaft, the rotating shaft is coaxially and fixedly connected to the output end of the actuator, and the sliding shaft is in sliding connection with the rotating shaft along the axial direction of the sliding shaft; one end of the sliding shaft, facing the actuator, is connected with the rotating shaft through a spring, and the spring provides elastic force for preventing the sliding shaft from moving towards the actuator; the thread gauge is coaxially and fixedly connected to one end, away from the actuator, of the sliding shaft, and a measuring portion of the thread gauge extends out of the rotating shaft.

5. The thread testing machine of claim 4, wherein: the sliding shaft is fixedly provided with a radial pin shaft perpendicular to the axis of the sliding shaft, and the side wall of the rotating shaft is centrally and symmetrically provided with two guide grooves for the two ends of the radial pin shaft to slide respectively.

6. The thread detecting machine of claim 5, wherein: first rolling bearings are mounted at two ends of the radial pin shaft to reduce friction.

7. The thread testing machine of claim 4, wherein: the inner wall of the rotating shaft is provided with a step hole, a linear bearing matched with the sliding shaft is installed in the step hole, and a first clamp spring used for limiting the linear bearing is further installed on the step hole.

8. The thread testing machine of claim 4, wherein: the rotary table is characterized by further comprising a shell, wherein the shell is fixedly connected to the workbench and sleeved outside the rotary shaft to protect the rotary shaft; the two ends of the shell are respectively provided with a bearing step, a second rolling bearing matched with the rotating shaft is installed in the bearing step, and a second clamp spring used for limiting the second rolling bearing is further arranged on the bearing step.

9. The thread detecting machine according to claim 4, wherein: the thread gauge comprises a detection part for detecting the thread and a connecting rod connected with the detection part; still include and change the piece, it is coaxial ground fixed connection to change the piece be the slip axle deviates from the one end of executor, the connecting rod of screw thread gauge can be dismantled the connection and change on the piece.

10. The thread testing machine of claim 9, wherein: an installation groove with a non-circular cross section is arranged in the replacing part, and a torsion structure matched with the installation groove is arranged at the end part of the connecting rod; still be provided with the spring locating pin in changing the piece, be provided with correspondingly on the lateral wall of connecting rod with the positioning ring groove of spring locating pin looks adaptation.