Go-no go gauge for one-time detection of internal thread of nut and automatic detection device

Abstract

The utility model relates to a go / no-go gauge for one-time detection of internal threads of nuts and an automatic detection device, the go / no-go gauge is provided with a handle body, a go / no-go gauge main body is arranged above the handle body, and the go / no-go gauge main body comprises a go gauge section arranged at the upper part and a go / no-go gauge section arranged at the lower part; the top of the go-no go gauge body is provided with a conical head. A guide section is arranged below the conical head, and a go gauge section is arranged below the guide section. The automatic detection device comprises the go-no go gauge for one-time detection of the internal thread of the nut, a rotation drive, a lifting frame, a lifting guide, a vertical frame, a flexible drive and a lifting drive. The upper part of the rotary drive is a chuck, and the lower part of the rotary drive is a rotary drive motor which is a constant-torque motor; the rotary drive is mounted on one side of the vertical frame through the lifting frame and the lifting guide; the lifting driver is arranged on the other side of the vertical frame; and the lifting frame and the lifting driving device are connected together through a flexible driver. The device is simple in structure and easy to manufacture; the detection efficiency is high, and flexible adjustment can be carried out according to detection requirements of different products.

Description

Technical Field

[0001] The utility model relates to an automatic detection device which can detect the internal thread of a welded nut online, in particular adopts a one-time detection no-go gauge to realize one-time detection, and belongs to the field of automatic detection equipment. Background Art

[0002] Sheet metal parts often need to be welded with nuts according to usage requirements to form products with nuts for use. On the automated welding production line, in order to ensure that the nuts on the final product are usable, the internal threads of the nuts after welding need to be inspected.

[0003] The internal thread inspection of nuts generally adopts a thread stop gauge; a conventional thread stop gauge has a go gauge thread on one end and a stop gauge thread on the other end. The two ends are screwed on the internal thread. The go gauge thread can pass through and the stop gauge thread stops within the specified range, that is, the surface internal thread size is qualified and can be used. If the conventional thread stop gauge is used to inspect the internal thread of the nut, combined with the automatic drive equipment, two workstations are required to achieve it, which will inevitably increase the equipment space.

[0004] A threaded through-and-stop integrated detection device with Chinese patent publication number CN107860282A adopts a special through-and-stop gauge design, in which the thread through-and-stop gauge is designed on the same side. It is driven by a transmission system and screwed into the thread for detection, realizing automated operation and requiring only one workstation.

[0005] However, in order to avoid damage to the thread and the go-gauge due to inconsistency between the rotation speed and the feed speed when the transmission system drives the go-gauge to screw into the thread, the transmission system has relatively high requirements, and a servo motor needs to be used in conjunction with a high-precision control system. In addition, the installation part of the go-gauge has a complex structure, making it difficult to maintain, replace and adjust.

[0006] In view of the above situation, it is necessary to further improve the detection device of the internal thread of the nut in order to simplify the equipment structure, reduce the requirements for parts and components, and improve the detection efficiency. Utility Model Content

[0007] The purpose of the utility model is to provide a one-time detection of the internal thread of a nut and an automatic detection device. Through the one-piece designed thread no-go gauge combined with a driving device, a one-time detection of the internal thread of the nut can be achieved, thereby improving the detection efficiency. The driving device has a reasonable structure and reduces the requirements for the driving components.

[0008] In order to achieve the above-mentioned utility model object, the first aspect of the utility model provides a go gauge for one-time detection of internal threads of a nut, comprising a handle body, a go gauge main body above the handle body, including a go gauge section located at the upper part, and a go gauge section located at the lower part;

[0009] The top of the stop gauge body is provided with a cone head;

[0010] A guide section is provided below the cone head, the thread height of the guide section is lower than the thread height of the through gauge section, and the thread of the guide section is connected with the thread of the through gauge section;

[0011] A through gauge section is arranged below the guide section.

[0012] As a further improvement of the utility model, a chip removal groove is longitudinally provided on the upper part of the stop gauge body;

[0013] The chip removal groove starts from the lower part of the cone head and penetrates the guide section and the through gauge section to the lower part of the through gauge section.

[0014] Furthermore, there are 1, 2, or 3 chip removal grooves.

[0015] As a further improvement of the utility model, a sewage discharge cone is provided between the stop gauge section and the through gauge section;

[0016] The sewage cone is a cone with a small top and a large bottom.

[0017] The maximum outer diameter of the drain cone is still smaller than the minor diameter of the internal thread of the nut to be tested.

[0018] When the utility model of the one-time detection of the internal thread of the nut is working, the driving device rises from the bottom to the top and approaches the internal thread of the nut to be detected. At this time, the non-stop gauge is in a forward rotation state;

[0019] First, the cone head contacts the inner thread hole of the nut for centering;

[0020] Then, the guide section enters the nut and gradually engages with the internal thread as it rotates;

[0021] Then, the go gauge section enters the nut, and the thread of the go gauge section meshes with the internal thread to detect the passability of the internal thread of the nut;

[0022] During the process, dust and iron filings that may adhere to the internal threads will be brought into the chip groove, and will be squeezed to form particles. Under their own gravity, the particles will be discharged downward along the chip groove. The particles will eventually leave the chip groove and pass through the drainage cone, generating lateral force away from the stop gauge, and fall, thus avoiding falling on the stop gauge section.

[0023] After the through gauge section is completely screwed into the nut, the stop gauge continues to rotate and rise, the drainage cone enters the nut, and finally the stop gauge section is screwed into the nut;

[0024] The size of the stop gauge section is relatively large, and it is usually stuck after rotating 1-2 pitches, proving that the thread of the nut is qualified.

[0025] Finally, the driving device drives the go gauge to rotate in the opposite direction and gradually withdraw it from the nut, thus completing the detection.

[0026] In a second aspect of the utility model, a one-time automatic detection device for internal threads of nuts is provided, comprising the one-time detection stop gauge for internal threads of nuts as described above, and a rotary drive, a lifting frame, a lifting guide, a stand, a flexible drive, and a lifting drive;

[0027] The handle of the go gauge for one-time inspection of the internal thread of the nut is clamped on the upper part of the rotary drive, and the main body of the go gauge protrudes upward;

[0028] The upper part of the rotary drive is a chuck, and the lower part is a rotary drive motor, which is a constant torque motor;

[0029] The rotary drive is installed on one side of the stand through a lifting frame and a lifting guide;

[0030] The lifting drive is arranged on the other side of the stand;

[0031] The lifting frame and the lifting drive device are connected together through a flexible drive.

[0032] As a further improvement of the present invention, the lifting frame wraps around the rotary drive;

[0033] The axis of the rotary drive and the stop gauge is parallel to the axis of the lifting guide;

[0034] A lifting guide is provided between the lifting frame and the vertical frame;

[0035] The lifting guide is a linear guide rail, a slider of the linear guide rail is fixed on the inner side of the lifting frame, a slide rail of the linear guide rail is fixed on the outer side of the vertical frame, and the slider is matched with the slide rail.

[0036] As a further improvement of the utility model, a lifting position sensor is installed on the stand through a bracket;

[0037] The lift position sensor is aligned with the lift frame.

[0038] Further, the lifting position sensor is a switch signal sensor;

[0039] There are two lifting position sensors, arranged up and down;

[0040] The lift position sensor below is a qualified indication sensor;

[0041] The upper lift position sensor is a threaded oversized indicating sensor.

[0042] As a further improvement of the utility model, the lifting drive is a cylinder, the cylinder body of the cylinder is fixed on the stand, and the piston rod of the cylinder extends upward.

[0043] Further, the flexible drive is a chain device;

[0044] The piston rod and the lifting frame are connected together by a chain;

[0045] Sprocket wheels are respectively arranged on both sides of the top of the frame, and the sprocket wheels are supported below the chain.

[0046] Furthermore, the flexible drive is a belt transmission device or a rope transmission device.

[0047] As a further improvement of the utility model, two limit sensors are provided on the cylinder body of the lifting drive cylinder.

[0048] The utility model discloses a one-time detection no-go gauge and automatic detection device for the internal threads of nuts. By adopting a one-time detection no-go gauge with a go gauge section and a no-go gauge section in an integrated design, one-time detection of the internal threads of nuts can be achieved, thereby improving detection efficiency. At the same time, by combining a rotary drive, a flexible drive, and a lifting drive, flexible matching of rotation and lifting can be achieved, thereby avoiding the possibility of damage to the threads during the detection process.

[0049] The utility model discloses a one-time detection no-go gauge and an automatic detection device for the internal thread of a nut, which has a simple structure and is easy to manufacture; the detection efficiency is high, and the device can be flexibly adjusted according to the detection requirements of different products. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 The overall structure of the one-time automatic detection device for the internal thread of a nut of the utility model is shown in FIG. Figure 1 ;

[0051] Figure 2 The overall structure of the one-time automatic detection device for the internal thread of a nut of the utility model is shown in FIG. Figure 2 ;

[0052] Figure 3 The overall structure of the one-time automatic detection device for the internal thread of a nut of the utility model is shown in FIG. Figure 3 ;

[0053] Figure 4 The overall structure of the one-time automatic detection device for the internal thread of a nut of the utility model is shown in FIG. Figure 4 ;

[0054] Figure 5 The overall structure of the no-go gauge for one-time inspection of the internal thread of a nut Figure 1 ;

[0055] Figure 6 The overall structure of the no-go gauge for one-time inspection of the internal thread of a nut Figure 2 . DETAILED DESCRIPTION

[0056] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0057] The utility model provides a one-time automatic detection device for the internal thread of a nut. Figure 1-Figure 4 As shown, it includes a stop gauge 1, a rotation drive 2, a lifting frame 3, a lifting guide 4, a vertical frame 5, a flexible drive, and a lifting drive 7.

[0058] The utility model further provides a one-time detection of the internal thread of the nut, namely, a one-time detection of the internal thread of the nut, which has a specific structure as follows: Figure 5 , Figure 6 shown.

[0059] The go gauge 1 has a handle 11 for clamping; the go gauge body is located above the handle 11, including a go gauge section 14 at the upper part and a go gauge section 16 at the lower part.

[0060] A cone head 12 is provided on the top of the main body of the stop gauge for guiding.

[0061] A guide section 13 is provided below the cone head 12 . The thread of the guide section 13 is an incomplete thread. The thread height of the guide section 13 is lower than the thread height of the through gauge section 14 . The thread of the guide section 13 is connected with the thread of the through gauge section 14 .

[0062] The upper part of the stop gauge body is longitudinally provided with a chip removal groove 15, which starts from the lower part of the cone head 12 and passes through the guide section 13 and the go gauge section 14 to the lower part of the go gauge section 14. There are one, two, or three chip removal grooves 15.

[0063] A drainage cone 17 is provided between the stop gauge section 16 and the through gauge section 14. The drainage cone 17 is a conical cone with a small upper end and a large lower end. The maximum outer diameter of the drainage cone 17 is still smaller than the minor diameter of the internal thread of the nut to be tested, and can pass through the internal thread to be tested without obstacles.

[0064] The utility model discloses a one-time detection go gauge for the internal thread of a nut, that is, when the go gauge 1 is working, it is raised from the bottom by a driving device and approaches the internal thread of the nut to be detected. At this time, the go gauge 1 is in a forward rotation state; the cone head 12 first contacts the internal thread hole of the nut for centering; then, the guide section 13 enters the nut and gradually meshes with the internal thread as it rotates; then, the go gauge section 14 enters the nut, and the thread of the go gauge section 14 meshes with the internal thread to detect the passability of the internal thread of the nut; during the process, dust, Iron chips will be brought into the chip groove 15, and will be squeezed to form particles. Under their own gravity, they will be discharged downward along the chip groove 15. The particles will eventually leave the chip groove 15, and then pass through the drainage cone 17, generating lateral force away from the stop gauge 1, and fall, thus avoiding falling on the stop gauge section 16; after the go gauge section 14 is completely screwed into the nut, the stop gauge 1 continues to rotate and rise, and the drainage cone 17 enters the nut, and finally the stop gauge section 16 is screwed into the nut; the size of the stop gauge section 16 is relatively large, and it is generally stuck after rotating 1-2 pitches, which proves that the thread of the nut is qualified. Finally, the drive device drives the stop gauge 1 to rotate in the opposite direction, and gradually withdraws from the nut, and the detection is completed.

[0065] In the one-time automatic detection device for internal threads of nuts of the utility model, the handle 11 of the go-no-go gauge 1 is clamped on the upper part of the rotary drive 2, so that the main body of the go-no-go gauge protrudes upward.

[0066] The upper part of the rotary drive 2 is a chuck for clamping the handle 11 of the go gauge 1; the lower part is a rotary drive motor 22, which is a constant torque motor. According to the needs of thread detection, the output torque is adjusted to control the torque at an appropriate size, so that the go gauge section 14 of the go gauge 1 has enough torque to be screwed into and through the internal thread of the nut, and at the same time, the stop gauge section 16 of the go gauge 1 can be screwed into the internal thread of the nut, but the torque is not too large, and the screwing is not too much, causing the stop gauge section 16 to be completely stuck in the internal thread of the nut, making it difficult to withdraw, and even causing damage to the nut and the go gauge 1.

[0067] The rotary drive 2 is installed on one side of the vertical frame 5 through the lifting frame 3 and the lifting guide 4. The lifting frame 3 preferably wraps the rotary drive 2 to make the installation more reliable and make the axis of the rotary drive 2 and the stop gauge 1 parallel to the axis of the lifting guide 4. A lifting guide 4 is provided between the lifting frame 3 and the vertical frame 5. The lifting guide 4 is preferably a linear guide, wherein a slider 41 is fixed on the inner side of the lifting frame 3, and a slide rail 42 is fixed on the outer side of the vertical frame 5, and the slider 41 is adapted to the slide rail 42.

[0068] Furthermore, a lifting position sensor 33 is installed on the stand 5 through a bracket 34, and the height of the lifting position sensor 33 is adjustable; the lifting position sensor 33 is aligned with the lifting frame 3, and is used to detect the rising height of the lifting frame 3, the rotary drive 2, and the stop gauge 1, so as to determine whether the stop gauge 1 is screwed into the nut and reaches the specified height. The lifting position sensor 33 is generally a photoelectric sensor or a Hall sensor, which is a switch signal sensor, so it cannot accurately detect the rising distance of the lifting frame 3; therefore, the lifting position sensor 33 is preferably provided with two, the lower one is a qualified indication sensor, and the upper one is a thread oversize indication sensor;

[0069] The lifting frame 3 drives the stop gauge to rise;

[0070] When the lifting frame 3 does not rise high enough to trigger the qualified indication sensor, the stop gauge 1 is not screwed into the nut and does not rise to the correct position, that is, the gauge section 14 fails to pass through the internal thread of the nut normally; the internal thread of the nut is too small and unqualified.

[0071] When the lifting frame 3 rises to the right height, the qualified indication sensor can be triggered, that is, the stop gauge 1 is screwed into the nut and rises to the right position. At this time, the stop gauge section 16 is screwed into the internal thread of the nut by 1-2 pitches; the internal thread of the nut is just qualified.

[0072] When the lifting frame 3 rises too high, it triggers the qualified indication sensor and then moves away from the qualified indication sensor, and even finally triggers the thread oversize indication sensor, the stop gauge 1 rises too much after being screwed into the nut, that is, the stop gauge section 16 fails to stop in the internal thread of the nut, exceeds 2 tooth pitches, or even completely passes through the internal thread; the internal thread of the nut is oversize and unqualified.

[0073] The existing lifting frame 3, the rotary drive 2 and the go gauge 1 are generally lifted and lowered directly by the lifting drive, which often leads to the mismatch between the rotation and the feed of the go gauge 1. The internal thread pitch of the nut is generally only 1-2mm. If the feed does not match, the thread will often be damaged.

[0074] In the one-time automatic detection device for internal threads of nuts of the utility model, the lifting frame 3 is connected to the lifting drive 7 through a flexible drive. The lifting drive 7 is arranged on the other side of the stand 5, that is, the lifting drive 7 and the lifting frame 3 are arranged on both sides of the stand 5; the lifting drive 7 is a cylinder, and the cylinder body 71 of the cylinder is fixed at a suitable height position on the stand 5, and the height position can be adjusted according to specific detection requirements to match the height position of the stand 5; the piston rod 72 of the cylinder extends upward.

[0075] In this embodiment, the flexible drive is a chain device, that is, the piston rod 72 and the lifting frame 3 are connected together through the chain 61, and sprocket wheels 62 are respectively provided on both sides of the top of the stand 5, and the sprocket wheels 62 support the chain 61.

[0076] The flexible drive here can also be a belt drive or a rope drive.

[0077] like Figure 2 As shown, the lifting drive 7 is in action, ① driving the piston rod 72 to descend, ② the piston rod 72 drives the chain 61 connected thereto downward, ③ the chain 61 drives the sprocket 62 to rotate, ④ the chain 61 is rigid at this time and moves as a whole, ⑤ the chain 61 is finally connected to the lifting frame 3, ⑥ driving the lifting frame 3 to rise, ⑦ the rise of the lifting platform 3 drives the stop gauge 1 to rise and insert it into the internal thread of the nut to be tested.

[0078] The cylinder is used as the power source of the lifting drive 7. By adjusting the air pressure, the rising process of the stop gauge 1 is slow. When it rises to the right position and the stop gauge section 16 of the stop gauge 1 is stuck in the nut, the cylinder will no longer output, avoiding damage to the parts to be tested.

[0079] When the go-no-go gauge 1 needs to be lowered, the lifting drive 7 moves in the opposite direction, driving the piston rod 72 to rise quickly. At this time, the chain 61 is flexible, so that the lifting platform 3 is in a free state, and the go-no-go gauge 1 is reversed and withdrawn by the rotary drive 2. The gravity of the lifting platform 3 and the rotary drive 2 drives the go-no-go gauge 1 to descend, thereby effectively avoiding the possibility of damaging the internal thread of the nut when the go-no-go gauge 1 is withdrawn.

[0080] Furthermore, two limit sensors 73 are provided on the cylinder body 71 of the cylinder of the lifting drive 7 to control the extension and retraction distance of the piston rod 72 of the cylinder to match the lifting distance of the stop gauge 1.

[0081] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. A one-time detection gauge for the internal thread of a nut, characterized in that: A handle body is provided, and a stop gauge body is located above the handle body, including a go gauge section located at the upper part and a stop gauge section located at the lower part; The top of the stop gauge body is provided with a cone head; A guide section is provided below the cone head, the thread height of the guide section is lower than the thread height of the through gauge section, and the thread of the guide section is connected with the thread of the through gauge section; A through gauge section is arranged below the guide section.

2. The one-time detection gauge for the internal thread of a nut according to claim 1, characterized in that: The upper part of the stop gauge body is longitudinally provided with a chip removal groove; The chip removal groove starts from the lower part of the cone head and penetrates the guide section and the through gauge section to the lower part of the through gauge section.

3. The one-time detection gauge for the internal thread of a nut according to claim 1, characterized in that: A sewage cone is provided between the stop gauge section and the through gauge section; The sewage cone is a cone with a small top and a large bottom. The maximum outer diameter of the drain cone is still smaller than the minor diameter of the internal thread of the nut to be tested.

4. One-time automatic detection device for internal threads of nuts, characterized in that: It comprises a one-time detection stop gauge for the internal thread of a nut as claimed in any one of claims 1 to 3, and a rotary drive, a lifting frame, a lifting guide, a stand, a flexible drive, and a lifting drive; The handle of the go gauge for one-time inspection of the internal thread of the nut is clamped on the upper part of the rotary drive, and the main body of the go gauge protrudes upward; The upper part of the rotary drive is a chuck, and the lower part is a rotary drive motor, which is a constant torque motor; The rotary drive is installed on one side of the stand through a lifting frame and a lifting guide; The lifting drive is arranged on the other side of the stand; The lifting frame and the lifting drive device are connected together through a flexible drive.

5. The one-time automatic detection device for internal threads of nuts according to claim 4, characterized in that: The lifting frame encases the rotary drive; The axis of the rotary drive and the stop gauge is parallel to the axis of the lifting guide; A lifting guide is provided between the lifting frame and the vertical frame; The lifting guide is a linear guide rail, a slider of the linear guide rail is fixed on the inner side of the lifting frame, a slide rail of the linear guide rail is fixed on the outer side of the vertical frame, and the slider is matched with the slide rail.

6. The one-time automatic detection device for internal threads of nuts according to claim 4, characterized in that: A lifting position sensor is installed on the stand through a bracket; The lift position sensor is aligned with the lift frame.

7. The one-time automatic detection device for internal threads of nuts according to claim 6, characterized in that: The lifting position sensor is a switch signal sensor; There are two lifting position sensors, arranged up and down; The lift position sensor below is a qualified indication sensor; The upper lift position sensor is a threaded oversized indicating sensor.

8. The one-time automatic detection device for internal threads of nuts according to claim 4, characterized in that: The lifting drive is a cylinder, the cylinder body of the cylinder is fixed on the vertical frame, and the piston rod of the cylinder extends upward.

9. The one-time automatic detection device for internal threads of nuts according to claim 8, characterized in that: The flexible drive is a chain device; The piston rod and the lifting frame are connected together by a chain; Sprocket wheels are respectively arranged on both sides of the top of the frame, and the sprocket wheels are supported below the chain.

10. The one-time automatic detection device for internal threads of nuts according to claim 8, characterized in that: The flexible drive is a belt drive or a rope drive.

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