CN213301001U

CN213301001U - Detection apparatus for screw thread

Info

Publication number: CN213301001U
Application number: CN202022780603.1U
Authority: CN
Inventors: 谢利峰; 高健; 潘虎; 尹佳玮
Original assignee: SOHBI CRAFT (CHANGSHU) CO Ltd
Current assignee: SOHBI CRAFT (CHANGSHU) CO Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-05-28
Anticipated expiration: 2030-11-26

Abstract

A detection device for screw threads comprises a bottom plate, wherein a case shell and a detection workbench are arranged on the bottom plate, a driving mechanism is arranged in an inner cavity of the case shell, the driving mechanism comprises a PLC (programmable logic controller) control case, a servo amplifier and a servo motor, and the servo motor is connected with a driving shaft; a detection working assembly is arranged above the detection working table and comprises a detection rotating shaft and a coupler, the detection rotating shaft is connected with the driving shaft, a clamping piece is arranged at one end of the detection rotating shaft, and a thread inspection gauge is arranged at the other end of the detection rotating shaft; a reset assembly is arranged in the detection workbench and comprises a connecting plate and a pair of guide posts, the pair of guide posts are connected to two ends of the connecting plate and extend into the inner cavity of the workbench to reciprocate, and positioning blocks are arranged on the posts of the pair of guide posts; a detection fixing plate is arranged on the surface of one side of the connecting plate, which is opposite to the detection workbench, the detection fixing plate is provided with a pair of clamping arms, and a clamping groove is formed between the clamping arms; the top panel of the workbench is provided with a starting sensor and an ending sensor. The detection efficiency is improved and the detection standardization is realized.

Description

Detection apparatus for screw thread

Technical Field

The utility model belongs to the technical field of machining equipment, concretely relates to detection device of screw thread.

Background

In the machining and production process of mechanical parts, particularly in the secondary machining process of producing workpieces, nuts are often required to be welded on base materials, welding materials sometimes splash in threads to form welding slag in the process, the service life of the threaded parts is greatly influenced by the existence of the slag in threaded holes of the base parts, meanwhile, the workpieces and corresponding parts are not firmly combined and fixed, and even serious consequences such as breakage can occur, so that the threaded holes of the nuts on the machined workpieces must be detected. Because of the existence of great obstacles by the naked eyes, the detection is usually carried out by means of a common internal thread detection tool such as a thread gauge in the detection process, and the detection is carried out by screwing the thread gauge into a threaded hole in the operation process in a manual mode, but the manual screwing-in type detection method has low speed and efficiency, directly influences the production speed, cannot meet the daily production requirements, and has low enterprise economic benefit; in addition, each operator manually adapts to the threaded hole of the workpiece through the thread gauge, but the strength of different operators is different, so that the tightness degree of the detected qualified threaded workpiece is different, and the uniformity and the standardization of thread detection cannot be realized.

In order to solve the above problems, the applicant has made an advantageous design, and the technical solutions to be described below have been made in such a context.

Disclosure of Invention

An object of the utility model is to provide a thereby be favorable to abandoning artifical hand and twist to detect and realize automatic short-term test and effectively improved detection efficiency and realize detecting the standardization, thereby help avoiding taking place the detection device of the dead screw thread of the dead phenomenon of card to prevent to destroy corresponding part between the nut screw hole of screw thread inspection rule and work piece when detecting.

In order to achieve the above purpose, the utility model provides a technical scheme is: the utility model provides a detection apparatus for screw thread, including a bottom plate, fixed mounting has a chassis exterior and a test table on this bottom plate, the test table sets up in chassis exterior's one side and rather than fixed together the inside shell inner chamber that is formed with of chassis exterior and this chassis exterior becomes chassis exterior side board with a side board that the test table was fixed mutually the inside of test table is formed with a workstation inner chamber, and the top panel constitution of this test table is for workstation top panel, and the height that highly is less than chassis exterior of this test table, its characterized in that: a driving mechanism is arranged in the inner cavity of the shell of the case shell, the driving mechanism comprises a PLC control box, a servo amplifier and a servo motor which are electrically connected with each other, the servo motor is arranged in the middle of the height direction of the inner cavity of the shell and is close to one side position of the side panel of the shell, the servo motor is connected with a driving shaft, and the driving shaft extends out of the side panel of the shell and extends to the position above the top panel of the workbench; a detection working assembly is arranged above the detection working table and comprises a detection rotating shaft and a coupler, the detection rotating shaft is rotatably connected with a driving shaft through the coupler, a clamping piece is fixedly arranged at one end of the detection rotating shaft, which is far away from the side panel of the shell, a bearing seat used for supporting the detection rotating shaft and fixedly arranged on a top panel of the working table is also arranged between the clamping piece and the coupler, and a thread inspection gauge is arranged at one end of the clamping piece, which is far away from the detection rotating shaft; a reset assembly is arranged in the inner cavity of the workbench of the detection workbench, the reset assembly comprises a connecting plate and a pair of guide posts, the pair of guide posts are fixedly connected at two ends of the connecting plate in the length direction and extend into the inner cavity of the workbench along the horizontal direction and can reciprocate, and a positioning block is fixedly arranged on a column body of the guide post of the pair of guide posts in the inner cavity of the workbench; a detection fixing plate is fixedly arranged on the surface of one side of the connecting plate, which is opposite to the detection workbench, the detection fixing plate extends upwards along the vertical direction, a pair of clamping arms is formed at the upper part of the detection fixing plate, the pair of clamping arms are arranged at two sides of the thread inspection gauge, and a clamping groove for the thread inspection gauge to pass through and reciprocate is formed between the two clamping arms; the top panel of the workbench is provided with a starting sensor and a stopping sensor which can sense and detect the displacement position of the guide post in the inner cavity of the workbench through the position of the positioning block, and the starting sensor and the stopping sensor are electrically connected with the PLC control box.

In a specific embodiment of the present invention, the corners of the bottom plate are respectively provided with a bottom plate supporting foot.

In another specific embodiment of the present invention, a housing upper inclined plate is formed above the housing side panel of the chassis housing, a button switch and a counter are disposed on the housing upper inclined plate, and both the button switch and the counter are electrically connected to the PLC control box.

In another specific embodiment of the present invention, a heat dissipation fan is fixedly mounted on the chassis housing.

In another specific embodiment of the present invention, the detection workbench is far away from a side panel of the housing side panel, which is a workbench side panel, and a linear bearing is fixedly mounted on the outer side wall of the workbench side panel and corresponding to the position of the guide pillar, and the guide pillar is inserted into the inner cavity of the workbench after passing through the corresponding linear bearing.

The utility model discloses a still have a concrete embodiment detection workbench is close to on the inside wall of the side board of shell side board and corresponding to the position department of guide pillar is provided with guide pillar removal cover, the one end tip that the connecting plate was kept away from to guide pillar length direction is reciprocating motion in this guide pillar removal cover, and is provided with a guide pillar reset spring between this guide pillar removal cover and locating piece, and this guide pillar reset spring cover is established on the cylinder of guide pillar and both ends tip lean on respectively to lean on guide pillar removal cover and locating piece.

In yet another specific embodiment of the present invention, a positioning sensing portion is formed at each of both ends of the positioning block in the length direction.

In a more specific embodiment of the present invention, a long strip-shaped initial sensor fixing groove is formed at a position on one side of the top plate of the workbench, the initial sensor fixing groove extends along a moving direction of the positioning sensing part on one side of the positioning block, and the initial sensor is fixed in the initial sensor fixing groove by a fixing nut and can sense an initial position of the guide pillar; similarly, an elongated end sensor fixing groove is formed in the top surface plate of the workbench and at a position on one side of the detection working assembly away from the start sensor fixing groove, the end sensor fixing groove extends along the moving direction of the other side positioning sensing part of the positioning block, and the end sensor is fixed in the end sensor fixing groove by a fixing nut and can sense the end position of the guide post moving.

The utility model discloses a more and then a concrete embodiment detect the fixed plate with one side that the detection achievement platform carried on the back mutually is on the surface and at its direction of height's middle part position department fixed mounting has a supporting block.

The technical scheme provided by the utility model the technical effect lie in: firstly, a servo motor of a driving mechanism is adopted to rotate to drive a thread inspection gauge to perform thread detection on a workpiece with a welding nut to be detected, so that manual screwing detection of operators is abandoned, the detection is rapid and convenient, the detection efficiency is effectively and rapidly improved, and the detection standardization is realized by setting the torque of the servo motor; secondly, by arranging the reset component, the starting sensor and the ending sensor, when the detection is started, an operator pushes the workpiece with the welding nut against the detection fixing plate and slightly pushes the detection fixing plate, thereby the guide post moves and the positioning sensing part at one side of the positioning block leaves the initial sensor, at the moment, the initial sensor has no signal, the servo motor rotates forwards and drives the screw thread checking gauge to rotate forwards and screw into the screw thread hole of the nut of the workpiece to be checked, the guide pillar moves inwards for a certain distance in the process of screwing the thread, so that the positioning sensing part on the other side of the positioning block reaches the termination sensor, a signal is input to the PLC control box at the moment to enable the servo motor to rotate reversely, the thread detection gauge is driven to rotate reversely and the threaded hole is screwed out to realize the reset of the detection fixing plate so as to detect the next workpiece, the manual operation is effectively reduced, the operation is simple and convenient, and the use experience is good; thirdly, the phenomenon of clamping between the thread inspection gauge and a nut threaded hole of a workpiece to be inspected during inspection can be effectively avoided by setting the rotating torque of the servo motor, and the thread inspection gauge and the workpiece are prevented from being damaged; fourthly, through the clamping piece of the screw thread inspection gauge that adopts the fixable centre gripping, operating personnel can effectively realize the change of screw thread inspection gauge fast, has further improved work efficiency.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention.

Fig. 2 is a schematic perspective view of the detection table in the embodiment shown in fig. 1.

In the figure: 1. a bottom plate 11 supports the feet; 2. the electronic device comprises a case shell, 21. a shell inner cavity, 22. a shell side panel, 23. a shell upper inclined plate, 24. a button switch, 25. a counter, 26. a cooling fan; 3. detecting a workbench, 31, a workbench inner cavity, 32, a workbench top panel, 321, a starting sensor fixing groove, 322, a stopping sensor fixing groove, 33, a workbench side panel; 4. the system comprises a driving mechanism, 41, a PLC control box, 42, a servo amplifier, 43, a servo motor and 431, and a driving shaft; 5. detecting a working assembly, 51, a detection rotating shaft, 52, a coupler, 53, a bearing seat, 54, a clamping piece and 55, a thread inspection gauge; 6. the device comprises a reset assembly, a connecting plate 61, a guide post 62, a linear bearing 621, a guide post moving sleeve 622, a reset spring 623, a positioning block 63, a positioning sensing part 631 and a positioning sensing part, wherein the connecting plate is fixedly connected with the connecting plate; 7. detecting a fixing plate, 71 clamping arms, 72 clamping grooves and 73 supporting blocks; 8. an initiation sensor; 9. the sensor is terminated.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is given with respect to the position of the drawing being described, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 1 and 2, a screw thread detection device is shown, which includes a bottom plate 1, a chassis housing 2 and a detection table 3 are fixedly mounted on the bottom plate 1, the detection table 3 is disposed at one side of the chassis housing 2 and fixed together with the chassis housing 2, a housing cavity 21 is formed inside the chassis housing 2, a side plate of the chassis housing 2 fixed to the detection table 3 forms a chassis housing side plate 22, a table cavity 31 is formed inside the detection table 3, a top plate of the detection table 3 forms a table top plate 32, and the height of the detection table 3 is smaller than the height of the chassis housing 2.

As the technical essential of the utility model: a driving mechanism 4 is arranged in the inner cavity 21 of the casing 2, the driving mechanism 4 comprises a PLC control box 41, a servo amplifier 42 and a servo motor 43 which are electrically connected with each other, the servo motor 43 is arranged in the middle of the height direction of the inner cavity 21 of the casing and is close to one side position of the side panel 22 of the casing, the servo motor 43 is connected with a driving shaft 431, the driving shaft 431 extends out of the side panel 22 of the casing and extends to the upper position of the top panel 3 of the workbench, a detection working assembly 5 is arranged above the detection workbench 3, the detection working assembly 5 comprises a detection rotating shaft 51 and a coupling 52, the detection rotating shaft 51 is rotatably connected with the driving shaft 431 through the coupling 52, and a clamping piece 54 is fixedly arranged at one end of the detection rotating shaft 51 far away from the side panel casing 22, a bearing seat 53 for supporting the detection rotating shaft 51 and fixedly mounted on the top panel 32 of the workbench is further provided between the clamping piece 54 and the coupler 52, and a thread check gauge 55 is mounted at one end of the clamping piece 54 away from the detection rotating shaft 51; a reset component 6 is arranged in the workbench inner cavity 31 of the detection workbench 3, the reset component 6 comprises a connecting plate 61 and a pair of guide posts 62, the pair of guide posts 62 are fixedly connected at two ends of the connecting plate 61 in the length direction, extend into the workbench inner cavity 31 along the horizontal direction and can reciprocate, and a positioning block 63 is fixedly arranged on the column body of the guide post 62 of the pair of guide posts 62 in the workbench inner cavity 31; a detection fixing plate 7 is fixedly mounted on the surface of the connecting plate 61 on the side opposite to the detection workbench 3, the detection fixing plate 7 extends upwards along the vertical direction, a pair of clamping arms 71 is formed at the upper part of the detection fixing plate 7, the pair of clamping arms 71 is arranged at two sides of the thread checking gauge 55, and a clamping groove 72 for the thread checking gauge 55 to pass through and reciprocate is formed between the two clamping arms 71; the top plate 32 of the workbench is provided with a start sensor 8 and an end sensor 9 which can sense and detect the displacement position of the guide post 62 in the inner cavity 31 of the workbench through the position of the positioning block 63, and the start sensor 8 and the end sensor 9 are electrically connected with the PLC control box 41.

In this embodiment, a bottom plate supporting leg 11 is respectively disposed at the four corners of the bottom plate 1.

Further, a housing upper inclined plate 23 is formed above the housing side plate 22 of the housing case 2, a push switch 24 and a counter 25 are provided on the housing upper inclined plate 23, and both the push switch 24 and the counter 25 are electrically connected to the PLC control box 41.

Further, a heat dissipation fan 26 is fixedly mounted on the chassis housing 2.

In this embodiment, a side panel of the detection table 3 away from the side panel 22 of the housing is configured as a table side panel 33, a linear bearing 621 is fixedly mounted on each of the outer side walls of the table side panel 33 at a position corresponding to the guide post 62, and the guide post 62 penetrates through the corresponding linear bearing 621 and then protrudes into the table cavity 31.

Further, a guide post moving sleeve 622 is disposed on the inner side wall of a side panel of the detection table 3 close to the side panel 22 of the housing and at a position corresponding to the guide post 62, one end of the guide post 62 away from the connecting plate 61 in the length direction reciprocates in the guide post moving sleeve 622, a guide post return spring 623 is disposed between the guide post moving sleeve 622 and the positioning block 63, the guide post return spring 623 is sleeved on the column of the guide post 62, and two ends of the guide post return spring 623 respectively abut against the guide post moving sleeve 622 and the positioning block 63.

In the present embodiment, the positioning sensing parts 631 are formed at both ends of the positioning block 63 in the longitudinal direction.

Please refer to fig. 2 in combination with fig. 1, an elongated initial sensor fixing groove 321 is formed at a position on one side of the table top plate 32, the initial sensor fixing groove 321 extends along a moving direction of the positioning sensing part 631 on one side of the positioning block 63, and the initial sensor 8 is fixed in the initial sensor fixing groove 321 by a fixing nut and can sense an initial position of the guide post 62; similarly, an elongated end sensor fixing groove 322 is formed on the top plate 32 of the workbench and at a position on the side of the detection operation assembly 5 away from the start sensor fixing groove 321, the end sensor fixing groove 322 extends along the moving direction of the other side positioning sensor 631 of the positioning block 63, and the end sensor 9 is fixed in the end sensor fixing groove 322 by a fixing nut and can sense the end position of the movement of the guide post 62, during the detection, when the guide post 62 starts to move and the positioning sensor 631 on the side of the positioning block 63 is away from the start sensor 8, the start sensor 8 has no signal to make the servo motor 43 rotate forward and drive the screw inspection gauge 55 to rotate forward and screw into the nut screw hole of the workpiece to be inspected, during the screwing process, the guide post 62 moves inward for a certain distance, so that the other side positioning sensor 631 of the positioning block 63 reaches the end sensor 9, at this time, a signal is inputted to the PLC control box 41 to cause the servo motor 43 to rotate reversely to rotate the screw thread checking gauge 55 reversely and to be screwed out of the screw hole, so that the end sensor 9 is disposed at a position closer to the case side panel 22 of the case housing 2 than the start sensor 8 in the horizontal direction since the guide post 62 is moved toward the case housing 2 at the time of starting movement.

Preferably, a supporting block 73 is fixedly installed on the surface of the fixed detection plate 7 opposite to the detection workbench 3 and at the middle position of the detection plate in the height direction, and during the detection process, an operator can place the workpiece to be detected on the supporting block 73, so as to realize effective stable control of the workpiece during the detection process.

The working principle is as follows: when the workpiece to be inspected is started to work, the button switch 24 is turned on, an operator firstly abuts against the detection fixing plate 7 with the nut welded, the nut threaded hole of the workpiece to be inspected is aligned with the thread inspection gauge 55, the detection fixing plate 7 is further slightly pushed, the guide pillar 62 moves towards the outer shell side panel 22, the positioning sensing part 631 on one side of the positioning block 63 is separated from the starting sensor 8, the starting sensor 8 sends a signal to enable the servo motor 43 to rotate forwards, the rotating shaft 51 and the clamping piece 54 are detected through the coupler 52 to drive the thread inspection gauge 55 to rotate forwards, and the thread inspection gauge 55 is screwed into the thread of the nut threaded hole of the workpiece to be inspected; during screwing the thread, the guide post 62 moves a certain distance towards the shell side panel 22, so that the positioning sensing part 631 on the other side of the positioning block 63 reaches the termination sensor 9, if all the threads of the screw hole are normal, the termination sensor 9 has a signal and inputs the signal to the PLC control box 41 to further enable the servo motor 43 to rotate reversely, so that the thread detection gauge 55 is driven to rotate reversely, the return spring 623 enables the guide post 62 to move towards the direction far away from the shell 2 of the case, the thread detection gauge 55 is screwed out of the threaded hole, the reset of the detection fixing plate 7 is realized, the detection of the next workpiece is carried out, the inspection is finished, and meanwhile, the counter 25 records the production quantity; if the nut thread of the workpiece to be inspected is abnormal, if welding slag exists, the thread inspection gauge 55 cannot be screwed in, so that the torsion of the servo motor 43 is increased, once the set torsion value is reached, an alarm signal is generated, and a buzzer on the servo motor sends an alarm sound to prompt the abnormality.

To sum up, the technical solution provided by the present invention remedies the defects in the prior art, successfully completes the invention task, and faithfully embodies the technical effects mentioned in the above technical effect column by the applicant.

Claims

1. The utility model provides a detection apparatus for screw thread, includes a bottom plate (1), fixed mounting has a chassis exterior (2) and a testing platform (3) on this bottom plate (1), testing platform (3) set up in one side of chassis exterior (2) and together fixed with it chassis exterior (2) inside be formed with a shell inner chamber (21) and this chassis exterior (2) becomes chassis exterior side board (22) with a side board that testing platform (3) are fixed mutually the inside of testing platform (3) is formed with a workstation inner chamber (31), and the top panel of this testing platform (3) constitutes for workstation top panel (32), and the height that highly is less than chassis exterior (2) of this testing platform (3), its characterized in that: a driving mechanism (4) is arranged in a shell inner cavity (21) of the case shell (2), the driving mechanism (4) comprises a PLC control box (41), a servo amplifier (42) and a servo motor (43) which are electrically connected with each other, the servo motor (43) is arranged in the middle of the height direction of the shell inner cavity (21) and close to one side position of the shell side panel (22), the servo motor (43) is connected with a driving shaft (431), and the driving shaft (431) stretches out of the shell side panel (22) and extends to the position above the workbench top panel (32); a detection working assembly (5) is arranged above the detection working table (3), the detection working assembly (5) comprises a detection rotating shaft (51) and a coupler (52), the detection rotating shaft (51) is rotatably connected with a driving shaft (431) through the coupler (52), a clamping piece (54) is fixedly installed at one end, away from the shell side panel (22), of the detection rotating shaft (51), a bearing seat (53) used for supporting the detection rotating shaft (51) and fixedly installed on a working table top panel (32) is further arranged between the clamping piece (54) and the coupler (52), and a thread inspection gauge (55) is installed at one end, away from the detection rotating shaft (51), of the clamping piece (54); a reset assembly (6) is arranged in a workbench inner cavity (31) of the detection workbench (3), the reset assembly (6) comprises a connecting plate (61) and a pair of guide posts (62), the pair of guide posts (62) are fixedly connected to two ends of the connecting plate (61) in the length direction, extend into the workbench inner cavity (31) along the horizontal direction and can reciprocate, and a positioning block (63) is fixedly arranged on a column body of the guide post (62) of the pair of guide posts (62) positioned in the workbench inner cavity (31); a detection fixing plate (7) is fixedly installed on the surface of one side, opposite to the detection workbench (3), of the connecting plate (61), the detection fixing plate (7) extends upwards along the vertical direction, a pair of clamping arms (71) is formed at the upper part of the detection fixing plate, the clamping arms (71) are arranged on two sides of the thread checking gauge (55), and a clamping groove (72) through which the thread checking gauge (55) can pass and reciprocate is formed between the two clamping arms (71); the top panel (32) of the workbench is provided with a starting sensor (8) and a stopping sensor (9) which can sense and detect the displacement position of a guide post (62) in the inner cavity (31) of the workbench through the position of a positioning block (63), and the starting sensor (8) and the stopping sensor (9) are electrically connected with the PLC control box (41).

2. A screw thread detection device as claimed in claim 1, characterized in that a bottom plate support foot (11) is provided at each of the four corners of said bottom plate (1).

3. A screw thread detecting device according to claim 1, wherein a housing upper inclined plate (23) is formed above a housing side plate (22) of said housing (2), a push button switch (24) and a counter (25) are provided on said housing upper inclined plate (23), and both said push button switch (24) and said counter (25) are electrically connected to a PLC control box (41).

4. A screw thread detection device according to claim 1, wherein a heat dissipation fan (26) is fixedly mounted on said housing shell (2).

5. A screw thread inspection device as claimed in claim 1, wherein a side panel of said inspection table (3) remote from said side panel (22) of said housing is formed as a table side panel (33), a linear bearing (621) is fixedly mounted on each of outer side walls of said table side panel (33) and at a position corresponding to said guide post (62), said guide post (62) is inserted into said table cavity (31) after passing through the corresponding linear bearing (621).

6. The screw thread detection device according to claim 1, wherein a guide post moving sleeve (622) is disposed on an inner side wall of a side panel of the detection table (3) close to the side panel (22) of the housing and at a position corresponding to the guide post (62), one end of the guide post (62) away from the connecting plate (61) in the length direction reciprocates in the guide post moving sleeve (622), and a guide post return spring (623) is disposed between the guide post moving sleeve (622) and the positioning block (63), the guide post return spring (623) is sleeved on a column body of the guide post (62) and the two ends of the guide post return spring respectively abut against the guide post moving sleeve (622) and the positioning block (63).

7. The screw thread detecting device according to claim 1, wherein a positioning sensor (631) is formed at each of both ends of the positioning block (63) in the longitudinal direction.

8. The screw thread detecting device according to claim 1, wherein an elongated home sensor fixing groove (321) is formed at a position on one side of the table top plate (32), the home sensor fixing groove (321) is extended along a moving direction of the home sensor portion (631) on one side of the positioning block (63), and the home sensor (8) is fixed in the home sensor fixing groove (321) by a fixing nut and senses a home position of the movement of the guide post (62); similarly, an elongated end sensor fixing groove (322) is formed in the table top panel (32) at a position on one side of the detection operation member (5) away from the start sensor fixing groove (321), the end sensor fixing groove (322) extends along the moving direction of the other side positioning sensing part (631) of the positioning block (63), and the end sensor (9) is fixed in the end sensor fixing groove (322) by a fixing nut and senses the end position of the movement of the guide post (62).

9. The screw thread detection device according to claim 1, wherein a support block (73) is fixedly mounted on a surface of the detection fixing plate (7) opposite to the detection table (3) and at a middle position in a height direction thereof.