Thread detection device

Abstract

The present application relates to the technical field of detection equipment, and in particular to a thread detection device, comprising: a first guide rod, which has a front end portion along its length and is constructed to guide the tested nut along the length of the first guide rod toward the front end portion when the tested nut is sleeved outside the first guide rod; a second guide rod, which extends vertically and has an upper end portion and a lower end portion, and includes an external thread segment adapted to the tested nut, wherein the upper end portion is connected to the front end portion in a manner that it can rotate around a first vertical axis to receive the tested nut from the front end portion; a constraint mechanism, which is constructed to limit the rotation of the tested nut relative to the external thread segment but allow the tested nut to move downward.

Description

Technical Field

[0001] The present application relates to the technical field of detection equipment, and in particular to a thread detection device. Background Art

[0002] At present, there are devices that can automatically detect the thread quality of nuts. However, any technology is always eager to progress, and technicians in this field are always eager to obtain better automatic thread detection devices. Summary of the invention

[0003] The first object of the present application is to provide a thread detection device, which can effectively prevent the nut from rotating during the detection process. Another object is to provide a thread detection device, which can smoothly lead out the nut after being tested.

[0004] In the first aspect, the thread detection device proposed in the present application comprises:

[0005] A first guide rod having a front end portion along its length and configured to guide the nut to be tested to pass along the length of the first guide rod toward the front end portion when the nut to be tested is sleeved outside the first guide rod;

[0006] a second guide rod extending vertically and having an upper end portion and a lower end portion, and including an external threaded section adapted to the nut under test, wherein the upper end portion is connected to the front end portion in a manner rotatable about a first vertical axis to receive the nut under test from the front end portion;

[0007] A restraint mechanism is configured to restrict the rotation of the nut under test relative to the external thread section but allow the nut under test to move downward.

[0008] In some possible implementations, the restraint mechanism includes:

[0009] At least one flexible member is disposed on a radial side of the external thread segment and is configured to elastically press the outer peripheral surface of the nut under test in a radial direction.

[0010] In some possible implementations, the restraint mechanism includes:

[0011] The supporting roller is arranged at the radial side of the external thread section and is configured to rotate around a horizontal axis to support the nut under test in a direction toward the flexible member.

[0012] In some possible implementations, the support roller and one of the flexible members are respectively arranged on two radial sides of the external thread segment.

[0013] In some possible implementations, the flexible member is a brush, the bristles of the brush extend toward the external thread segment, or the flexible member is silicone.

[0014] In some possible implementations, the device further includes a material channel leading from the vibrating feeder, the first guide rod is placed in the material channel in a manner of not being connected to the material channel, and the material channel limits the radial range of motion of the first guide rod in a blocking manner;

[0015] The restraint mechanism is further configured to limit a movable range of the first guide rod in a length direction thereof by blocking the second guide rod in a radial direction.

[0016] In some possible implementations, the device further includes:

[0017] A vibratory feeder is configured to transfer the nut under test along the length of the first guide rod.

[0018] In some possible implementations, the device further includes:

[0019] motor;

[0020] a driving magnet, which is disposed at a distance from one radial side of the second guide rod and is configured to rotate around a second vertical axis under the drive of the motor, thereby generating a changing magnetic field;

[0021] The second guide rod includes a driven magnet that generates a magnetic field, and the driven magnet drives the second guide rod to rotate around the first vertical axis in response to the changing magnetic field.

[0022] In the second aspect, the thread detection device proposed in the present application includes:

[0023] A first guide rod having a front end portion along its length and configured to guide the nut to be tested to pass along the length of the first guide rod toward the front end portion when the nut to be tested is sleeved outside the first guide rod;

[0024] a second guide rod extending vertically and having an upper end portion and a lower end portion, and including an external threaded section adapted to the nut under test, wherein the upper end portion is connected to the front end portion in a manner rotatable about a first vertical axis to receive the nut under test from the front end portion;

[0025] A first sheath surrounds the second guide rod in a manner that the second guide rod is not connected thereto and separates the drive magnet from the second guide rod.

[0026] a third guide rod configured to extend downwardly in a curved manner from a lower end portion of the second guide rod, and wherein the lower end portion of the second guide rod is connected to the third guide rod in a manner rotatable about the second vertical axis;

[0027] The second sheath is configured to extend downwardly from the lower end of the first sheath in a curved manner and surround the third guide rod without being connected to the third guide rod, and to restrict the rotation of the third guide rod by abutting the inner wall of the second sheath against the third guide rod.

[0028] In some possible implementations, the first sheath and the second sheath are constructed as an integrated component.

[0029] According to the thread detection device provided in the first aspect of the present application, it can effectively prevent the nut from rotating during the detection process, which helps to smoothly carry out the detection work. According to the thread detection device provided in the second aspect of the present application, it can not only ensure the movement stability of the detection guide rod (second guide rod), but also can smoothly lead out the nut after detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0031] Figure 1 It is a schematic diagram of a thread detection device provided in an embodiment of the present application.

[0032] Figure 2 yes Figure 1 sectional view of .

[0033] Figure 3 It is a schematic diagram of a thread detection device provided in an embodiment of the present application.

[0034] Figure 4 yes Figure 3 sectional view of .

[0035] Description of reference numerals:

[0036] S-nut;

[0037] AX1-first vertical axis, AX2-second vertical axis, AX3-first horizontal axis, AX4-second horizontal axis;

[0038] 1-first guide rod, 1a-middle part, 1b-front end part;

[0039] 2-second guide rod, 2a-upper end portion, 2b-lower end portion;

[0040] 3-Hollow long rod;

[0041] 4-thread detection head, 4a-external thread section, 4b-connecting hole;

[0042] 5- driving magnet;

[0043] 6- Material feeding mechanism;

[0044] 7- Material shifting parts;

[0045] 8-base, 8a-slot, 8-threaded hole;

[0046] 9-elastic rib, 9a-material-dispensing end, 9a1-inner concave surface;

[0047] 10- third guide rod;

[0048] 11-first sheath, 11a-opening;

[0049] 12- second sheath;

[0050] 13- first motor;

[0051] 14- second motor;

[0052] 15- driven magnet;

[0053] 16- Restraint mechanism;

[0054] 17-support roller;

[0055] 18- flexible part;

[0056] 19-Vibration feeder;

[0057] 20- Base frame. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0059] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects, and, for example, the term "first element" itself does not mean the existence of the "second element", and the term "second element" itself does not mean the existence of the "first element". In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one, and "multiple" means not less than two.

[0060] In the description of the present application, the terms “including”, “having” indicate the existence of the described features, numbers, operations, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, numbers, operations, elements and / or their combinations.

[0061] In the description of the present application, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in the present specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0062] Figures 1 to 4 A thread detection device provided in an embodiment of the present application is shown, which can be used to detect the quality of the internal thread of a magnetic nut S. Here, the magnetic nut S refers to the nut S that can be magnetically attracted. For example, the magnetic nut S is an iron nut S that can be magnetically attracted.

[0063] The device comprises a vibrating feeder 19 , a first guide rod 1 , a second guide rod 2 and a third guide rod 10 which are sequentially arranged along a conveying path of the nut S to be tested, and further comprises a driving magnet 5 and a material-dispensing mechanism 6 .

[0064] The first guide rod 1 is configured to guide the magnetic nut S to pass forward along the length of the guide rod when the magnetic nut S is sleeved outside the first guide rod 1. Figure 3The base end portion 1a, the front end portion 1b, and the middle portion 1a extending between the base end portion and the front end portion 1b are shielded in the vibrating feeder 19, wherein the middle portion 1a extends straightly or curvedly on the same horizontal plane, and the front end portion 1b is formed into a generally arc shape that bends downward, and the base end portion, the middle portion 1a, and the front end portion 1b respectively define a portion of the length of the first guide rod 1. During operation, the magnetic nut S to be tested in the vibrating feeder 19 is transmitted to the outside of the base end portion sleeved on the first guide rod 1 under the action of vibration, and is transmitted to the front end portion 1b via the middle portion 1a, that is, the first guide rod 1 is constructed to guide the magnetic nut S to be transmitted along the length of the first guide rod 1 toward the front end portion 1b when the magnetic nut S to be tested is sleeved outside the first guide rod 1. As an example, the first guide rod 1 can be made of a whole high-stretching steel wire, and the diameter of the steel wire can be half of the inner diameter of the nut S to be tested.

[0065] The second guide rod 2 extends vertically and has an upper end portion 2a and a lower end portion 2b opposite to each other, wherein the upper end portion 2a is connected to the front end portion 1b of the first guide rod 1 in a manner that allows rotation around a first vertical axis AX1 to receive the magnetic nut S to be tested from the front end portion 1b of the first guide rod 1. In addition, the second guide rod 2 further includes an external threaded section 4a adapted to the nut S to be tested and a driven magnet 15 that generates a magnetic field.

[0066] As an example, the end face of the upper end portion 2a of the second guide rod 2 has a downwardly extending connecting hole 4b, and a portion of the front end portion 1b of the first guide rod 1 is inserted into the connecting hole 4b so as to be rotatable but not axially movable, thereby realizing the rotational connection between the second guide rod 2 and the first guide rod 1.

[0067] As an example, the second guide rod 2 includes a vertically extending hollow long rod body 3 and a thread detection head 4 having the aforementioned external thread segment 4a. The thread detection head 4 can be formed into an integrated structure by high-strength wear-resistant steel or other well-known high-strength wear-resistant materials, the lower half of which is fixedly inserted into the upper end opening of the hollow long rod body 3, and the upper half extends to the upper outside of the hollow rod body, the external thread segment 4a is specifically formed at the periphery of the upper half of the thread detection head 4, and the outer diameter of the external thread segment 4a is slightly larger than the diameter of other parts of the second guide rod 2. The driven magnet 15 is completely and firmly accommodated in the interior of the hollow long rod body 3. In addition, the upper end portion 2a of the second guide rod 2 is defined by the thread detection head 4, more specifically, the upper half of the thread detection head 4.

[0068] The driving magnet 5 is arranged at a distance on one radial side of the second guide rod 2, and in the height direction, the driving magnet 5 is lower than the position of the external thread segment 4a. In addition, the driving magnet 5 is configured to rotate around the second vertical axis AX2 under the drive of the first motor 13, thereby generating a changing magnetic field. The driven magnet 15 rotates in response to the changing magnetic field, thereby driving the second guide rod 2 to rotate as a whole around the first vertical axis AX1.

[0069] The material-moving mechanism 6 is configured to move downward the magnetic nut S which is sleeved outside the second guide rod 2 and is located below the external threaded section 4 a.

[0070] During the operation, the first guide rod 1 guides the tested nut S to be transferred to the second screw rod along the length of the first guide rod 1 through the front end portion 1b thereof when the tested nut S is sleeved outside the first guide rod 1. The driving magnet 5 rotates under the drive of the first motor 13 to generate a changing magnetic field, and the driven magnet 15 of the second guide rod 2 is acted upon by the changing magnetic field to drive the second guide rod 2 to rotate. When the tested nut S reaches the position of the external thread segment 4a of the second guide rod 2, if the quality of the internal thread of the tested nut S meets the standard, based on the rotation of the external thread segment 4a and the thread matching between the external thread segment 4a and the tested nut S, the tested nut S will move downward and pass over the external thread segment 4a. On the contrary, if the quality of the internal thread of the tested nut S does not meet the standard (for example, the internal thread of the nut S has unacceptable burrs), the tested nut S cannot pass over the external thread segment 4a because the tested nut S cannot be properly screwed with the external thread segment 4a. In addition, when the nut S under test is a magnetic nut S, when the magnetic nut S moves downward along the second guide rod 2 to the driving magnet 5 and / or the driven magnet 15, in order to prevent the magnetic nut S from being attracted by the driving magnet 5 and / or the driven magnet 15 and unable to continue moving downward, the material shifting mechanism 6 can be controlled to move the magnetic nut S at this position downward, so that the magnetic nut S overcomes the aforementioned magnetic attraction and leaves.

[0071] In order to prevent the tested nut S from rotating along with the external thread segment 4a at the external thread segment 4a of the second guide rod 2 and failing to move downward, the device is further provided with a constraint mechanism 16 which is constructed to limit the rotation of the nut S but allow the nut S to move axially downward.

[0072] Specifically, the aforementioned restraining mechanism 16 includes a support roller 17 adjacently arranged on one radial side of the external thread segment 4a, and a plurality of flexible members 18 adjacently arranged on the other radial side of the external thread segment 4a, and at least one of the flexible members 18 is arranged on the side of the external thread segment 4a opposite to the aforementioned support roller 17, and the support roller 17 is configured to rotate around the first horizontal axis AX3. As an example, each flexible member 18 is a brush, and the bristles of each brush extend toward the external thread segment 4a. In this way, when the tested nut S reaches the external thread section 4a, the bristles of the brush elastically press the outer peripheral surface of the nut S at least in the radial direction, thereby limiting the rotation of the nut S with a certain force, so that the tested nut S with qualified thread quality can smoothly pass over the external thread section 4a of the second guide rod 2 downward; and when the thread quality of the tested nut S is not up to standard, and thus the internal thread of the tested nut S and the external thread of the external thread section 4a are stuck to each other, the flexible member 18 in flexible contact with the tested nut S will not apply an excessive anti-rotation force to the tested nut S in the opposite direction of the rotation direction of the external thread section 4a, thereby preventing mechanical failure, such as preventing the structure of the external thread section 4a from being destroyed. The use of a brush as the flexible member 18 for pressing the tested nut S not only has a sufficiently large contact area with the tested nut S, thereby helping to improve the uniformity of the force on the tested nut S, but also can adapt to tested nuts S of various outer diameters even without adjusting the installation position of the brush. In other embodiments, the flexible member 18 is silicone.

[0073] The support roller 17 is used to support the nut S under test on the opposite side of one of the brushes in the direction of the brush, so as to prevent the second guide rod 2, especially the external thread section 4a of the second guide rod 2, from moving too far away from the brush under the pressure of the brush (the slender first guide rod 1 and the second guide rod 2 are very likely to produce such displacement deformation under the action of external force) - this will cause the friction between the brush and the nut S under test to be significantly reduced, thereby failing to effectively limit the rotation of the nut S. Figure 3 In the embodiment of the present invention, the brush opposite to the supporting roller 17 can be referred to as a main flexible member 18, and the remaining brushes can be referred to as additional flexible members 18.

[0074] In some embodiments, the device also includes a material channel leading from the vibrating feeder 19, and the first guide rod 1 (for example, the aforementioned middle portion 1a of the first guide rod 1) is placed in the material channel in a manner not connected to the material channel, and the inner wall of the material channel limits the radial range of movement of the first guide rod 1 by blocking the first guide rod 1 (for example, the cross-section of the material channel can be formed into a closed or substantially closed ring), so that the first guide rod 1 is held by the material channel in its radial direction. In addition, the aforementioned restraint mechanism 16 further limits the range of movement of the first guide rod 1 in its length direction by radially blocking the second guide rod 2. In this way, even if it is not mechanically connected to any other device (mechanical connection will cause the tested nut S to be unable to pass through the first guide rod 1, and more specifically, it will be unable to pass through the connection portion between the first guide rod 1 and the relevant device), the first guide rod can be restricted in both its radial and length directions, so that it can be basically maintained during operation. Figure 3 The position shown (may vibrate slightly), therefore, the tested nut S cannot pass through the first guide rod 1.

[0075] The material-dispensing mechanism 6 includes a material-dispensing component 7 and a second motor 14 as a power member. The material-dispensing component 7 is arranged on the other radial side of the second guide rod 2 opposite to the driving magnet 5, and is configured to move under the drive of the second motor 14, thereby shifting the magnetic nut S downward. It can be understood that, since the driving magnet 5 is separately arranged on one radial side of the second guide rod 2, the second guide rod 2 has sufficient arrangement space on the other radial side of the elevation where the driving magnet 5 is located, which makes it easy to arrange the material-dispensing component 7 of the material-dispensing mechanism 6 in the arrangement space.

[0076] Specifically, the material-shifting component 7 is configured to rotate around the second horizontal axis AX4 under the drive of the second motor 14, thereby shifting the magnetic nut S. During operation, the second motor 14 drives the material-shifting component 7 to rotate around the second horizontal axis AX4. Figure 1 The material-moving component 7 rotates counterclockwise around the second horizontal axis AX4. When the end portion of the material-moving component 7 rotates close to the second guide rod 2, it contacts the magnetic nut S at this position and moves the magnetic nut S downward, so that the magnetic nut S overcomes the attraction of the driving magnet 5 and / or the driven magnet 15 and moves downward.

[0077] Moreover, in the present embodiment, the material-digging component 7 is formed as a flexible elastic structure. Specifically, the material-digging component 7 includes a hard base 8 and a plurality of flexible elastic ribs 9, and the elastic ribs 9 may be made of silicone. Among them, the base 8 is fixedly connected to the output shaft of the second motor 14, so as to rotate around the second horizontal axis AX4 under the drive of the second motor 14. The base 8 has a plurality of slots 8a, a plurality of threaded holes 8b, and a plurality of fastening screws omitted from the figure. Each slot 8a extends in a direction perpendicular to the second horizontal axis AX4 and has a notch away from the second horizontal axis AX4, and a plurality of elastic ribs 9 are partially inserted into the plurality of slots 8a via their respective corresponding notches, that is, the elastic ribs 9 have an exposed portion extending from the notch. A plurality of threaded holes 8b respectively penetrate from the middle of the plurality of slots 8a to the outer surface of the base 8. Multiple fastening screws omitted from the figure are respectively screwed into multiple threaded holes 8b to press the elastic rib 9 against the inner wall of the slot 8a, thereby locking the length of the exposed portion of the elastic rib 9, and based on such a design, the length of the exposed portion of the elastic rib 9 can be flexibly adjusted by rotating the fastening screws, thereby adjusting the pushing force of the elastic rib 9 on the nuts S of different models under test.

[0078] The aforementioned multiple elastic ribs 9 are arranged at intervals in the circumferential direction of the second horizontal axis AX4, and the elastic ribs 9 extend in a direction perpendicular to the second horizontal axis AX4. In this embodiment, the number of elastic ribs 9 is two in total, and in other embodiments, only one elastic rib 9 may be provided, or three or even more elastic ribs 9 may be provided.

[0079] Since the material-shifting component 7 is a flexible elastic element, when the tested nut S is temporarily stuck in the shifted position due to relevant reasons (such as being blocked by the nut S below), the material-shifting component 7 will bend and deform and smoothly pass over the nut S, thereby avoiding excessive bending deformation of the second guide rod 2 and suppressing mechanical damage to the nut S. In addition, after passing over the nut S, the material-shifting component 7 returns to its initial shape, thereby having the ability to shift the nut S again in the next action cycle.

[0080] In addition, constructing the material-moving component 7 as a flexible elastic element has the following advantage: during operation, multiple nuts S under test that have passed the external thread segment 4a may be stacked on top of each other because they do not have time to move downward. When this happens, the rotating material-moving component 7 will elastically contact the outer peripheral surface of the nut S in a state of flexural deformation, and apply a downward pushing force to the nut S through the outer peripheral surface of the nut S.

[0081] In this embodiment, the driving magnet 5, the driven magnet 15 and the material-moving component 7 are arranged at the same height. In this way, on the one hand, it helps to reduce the distance between the driving magnet 5 and the driven magnet 15, thereby improving the magnetic force between the two, and improving the driving stability and efficiency of the driving magnet 5 on the driven magnet 15. On the other hand, the material-moving component 7 only needs to move the magnetic nut S downward by a small stroke to allow it to simultaneously escape from the magnetic attraction area of ​​the driving magnet 5 and the driven magnet 15. This is what the material-moving component 7 that only moves the magnetic nut S in a rotational motion urgently needs. In addition, it is necessary to point out that the magnetic area mentioned here refers to the area where the magnetic attraction to the magnetic nut S is large enough and thus the magnetic nut S cannot escape downward due to its own gravity.

[0082] Furthermore, the aforementioned multiple elastic ribs 9 can be formed to have approximately the same length, so that each elastic rib 9 can contact and move the magnetic nut S when rotated to a position close to the second guide rod 2, which helps to improve the material selection efficiency of the magnetic nut S by the material selection mechanism 6.

[0083] Furthermore, each elastic rib 9 has a material-dispensing end 9a away from the second horizontal axis AX4, and the end surface of the material-dispensing end 9a is an inner concave surface 9a1. It can be understood that configuring the end surface of the material-dispensing end 9a of the elastic rib 9 as the inner concave surface 9a1 helps to increase the contact area between the elastic rib 9 and the magnetic nut S during the material-dispensing process, and helps to enhance the uniformity of the force applied by the elastic rib 9 to the magnetic nut S.

[0084] In addition, the device further comprises a first sheath 11 , a second sheath 12 and a third guide rod 10 .

[0085] The first sheath 11 surrounds the second guide rod 2 without being connected to the second guide rod 2, and separates the driving magnet 5 from the second guide rod 2. Moreover, the first sheath 11 has an opening 11a extending vertically, and the material-moving component 7, more specifically, the material-moving end 9a of the elastic rib 9 enters the first sheath 11 through the opening 11a to move the magnetic nut S. The first sheath 11 configured in this way can effectively limit the position of the second guide rod 2 within a specified spatial range, and prevent the second guide rod 2 from swinging (shaking) significantly under the magnetic force of the driving magnet 5 and the driven magnet 15.

[0086] The third guide bar 10 is configured to extend downwardly in a curved manner from the lower end portion 2 b of the second guide bar 2 , and the lower end portion 2 b of the second guide bar 2 is connected to the third guide bar 10 in a rotatable manner about the second vertical axis AX2 .

[0087] The second sheath 12 is constructed to extend downward in a curved manner from the lower end side of the upper section and surround the third guide rod 10 without being connected to the third guide rod 10. During operation, the rotation of the third guide rod 10 is limited by the inner wall of the second sheath 12 abutting against the third guide rod 10.

[0088] In detail, during the operation, the nut S to be tested, which is removed by the material removal mechanism 6, is transferred to the third guide rod 10 via the lower end portion 2b of the second guide rod 2, and moves continuously along the third guide rod 10. In this process, the rotating second guide rod 2 may drive the third guide rod 10 to rotate, and the third guide rod 10 stops rotating when, for example, its lower end contacts the inner wall surface of the second sheath 12. In this way, the third guide rod 10 that stops rotating provides a rotation support point for the lower end portion 2b of the second guide rod 2. Therefore, the two ends of the second guide rod 2 are supported and positioned by the first guide rod 1 and the third guide rod 10, respectively. Therefore, the second guide rod 2 can rotate in the sheath in a relatively stable posture without swinging significantly. In addition, when the magnetic nut S reaches the contact position between the third guide rod 10 and the inner wall of the second sleeve 12, based on the nut S's own gravity and the force applied by the upper material removal mechanism 6, the nut S will reversely open the third guide rod 10 so that the third guide rod 10 moves away from the inner wall of the second sleeve 12 and swings at a smaller angle, allowing the nut S to be smoothly removed.

[0089] In this embodiment, the first motor 13, the second motor 14, the flexible member 18, the first sheath 11 and the second sheath 12 are all directly or indirectly fixed to the base frame 20. For the sake of clarity, only a part of the base frame 20 is shown in the figure. In addition, the first sheath 11 and the second sheath 12 can be a single component connected as one body, or two components arranged separately.

Claims

1. A thread detection device, characterized in that: include: A first guide rod having a front end portion along its length and configured to guide the nut to be tested to pass along the length of the first guide rod toward the front end portion when the nut to be tested is sleeved outside the first guide rod; a second guide rod extending vertically and having an upper end portion and a lower end portion, and including an external threaded section adapted to the nut under test, wherein the upper end portion is connected to the front end portion in a manner rotatable about a first vertical axis to receive the nut under test from the front end portion; A restraint mechanism is configured to restrict the rotation of the nut under test relative to the external thread section but allow the nut under test to move downward.

2. The device according to claim 1, characterized in that The restraining mechanism comprises: At least one flexible member is disposed on a radial side of the external thread segment and is configured to elastically press the outer peripheral surface of the nut under test in a radial direction.

3. The device according to claim 2, characterized in that The restraining mechanism comprises: The supporting roller is arranged at the radial side of the external thread section and is configured to rotate around a horizontal axis to support the nut under test in a direction toward the flexible member.

4. The device according to claim 3, characterized in that The supporting roller and one of the flexible members are respectively arranged on two radial sides of the external thread segment.

5. The device according to any one of claims 2 to 4, characterized in that The flexible member is a brush, the bristles of which extend toward the external thread section, or the flexible member is silica gel.

6. The device according to any one of claims 1 to 4, characterized in that The device also includes: A vibratory feeder is configured to transfer the nut under test along the length of the first guide rod.

7. The device according to claim 6, characterized in that The device further comprises a material channel leading from the vibrating feeder, the first guide rod being placed in the material channel in a manner of not being connected to the material channel, and the material channel limiting the radial range of motion of the first guide rod in a blocking manner; The restraint mechanism is further configured to limit a movable range of the first guide rod in a length direction thereof by blocking the second guide rod in a radial direction.

8. The device according to claim 1, characterized in that The device also includes: motor; a driving magnet, which is disposed at a distance from one radial side of the second guide rod and is configured to rotate around a second vertical axis under the drive of the motor, thereby generating a changing magnetic field; The second guide rod includes a driven magnet that generates a magnetic field, and the driven magnet drives the second guide rod to rotate around the first vertical axis in response to the changing magnetic field.

9. A thread detection device, characterized in that: include: A first guide rod having a front end portion along its length and configured to guide the nut to be tested to pass along the length of the first guide rod toward the front end portion when the nut to be tested is sleeved outside the first guide rod; a second guide rod extending vertically and having an upper end portion and a lower end portion, and including an external threaded section adapted to the nut under test, wherein the upper end portion is connected to the front end portion in a manner rotatable about a first vertical axis to receive the nut under test from the front end portion; a first sheath surrounding the second guide rod in a manner not connected to the second guide rod and isolating the driving magnet from the second guide rod; a third guide rod configured to extend downwardly in a curved manner from a lower end portion of the second guide rod, and wherein the lower end portion of the second guide rod is connected to the third guide rod in a manner rotatable about the second vertical axis; The second sheath is configured to extend downwardly from the lower end of the first sheath in a curved manner and surround the third guide rod without being connected to the third guide rod, and to restrict the rotation of the third guide rod by abutting the inner wall of the second sheath against the third guide rod.

10. The device according to claim 9, characterized in that The first sheath and the second sheath are constructed as an integral component.

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