Bolt looseness detection device based on coaxial light source

Abstract

The utility model discloses a bolt looseness detection device based on a coaxial light source, which comprises a detection cylinder, cylinder openings are formed at the bottom and the top of the detection cylinder, and a bottom cover and a top cover are detachably connected to the two cylinder openings of the detection cylinder respectively; a through hole is formed in the bottom wall of the bottom cover, when the bolt is locked, the bolt rod penetrates through the through hole and is locked into a part through the bottom cover, and a first containing cavity for containing an identification piece which can be connected with the bolt cap in a matched mode is formed in the bottom cover; a second accommodating chamber communicated with the first accommodating chamber is formed in the detection cylinder and the top cover, and an image acquirer capable of acquiring an image of the identification piece and sending the image to an external processing terminal is accommodated in the second accommodating chamber; according to the utility model, resonance false alarm can be avoided, a closed detection space can be formed after the detection cylinder, the bottom cover and the top cover are mutually connected to carry out non-contact detection on bolt looseness, and the influence of an external environment can be blocked, so that the detection sensitivity and precision are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt loosening detection devices, in particular to a bolt loosening detection device based on a coaxial light source. Background Art

[0002] Bolts, as fasteners, are used to fasten components in mechanical equipment and transfer loads between the locked components. When mechanical equipment is running, it generates vibrations, which causes the bolts to resonate and loosen, reducing the connection strength between components. The mechanical equipment is prone to failure or damage, and even safety accidents. Therefore, it is necessary to detect bolt loosening.

[0003] Chinese patent CN217331585U discloses a construction site tower crane bolt loosening detector, and specifically discloses that it includes a bolt body, a detector body and a fixed plate, a threaded sleeve on the bolt body is provided with a nut, the detector body is installed on the top of the fixed plate, the top of the fixed plate is provided with a groove, a bidirectional screw is rotatably connected in the groove, the threaded sleeve on the bidirectional screw is provided with two threaded blocks, the threaded blocks are slidably connected in the groove, the bidirectional screw is provided with a driving assembly for driving the bidirectional screw to rotate, the top of the threaded block is fixedly connected to an L-shaped connecting rod, the L-shaped connecting rod is fixedly connected to a clamping plate, the bottom end of the clamping plate is provided with a placement groove, the placement groove is connected to an extension plate through a limit displacement assembly, and the bottom end of the extension plate is fixedly connected to a bottom support.

[0004] The above patent adopts a contact detection structure as a whole. When the bolt becomes loose, the mechanical transmission between the components is used to make the detector body aware of the loose bolt. Since the components are exposed and easily affected by the external environment, the mechanical transmission between the components may become stuck or not be in place, resulting in failure to detect the loose bolt in time and low sensitivity. At the same time, when the mechanical equipment vibrates, the components in the patented detector will also resonate, resulting in false alarms of loose bolts and low detection accuracy. Utility Model Content

[0005] The purpose of the utility model is to provide a bolt loosening detection device based on a coaxial light source, which can form a closed detection space to perform non-contact detection on bolt loosening, thereby improving detection sensitivity and accuracy.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A bolt loosening detection device based on a coaxial light source includes a detection cylinder with barrel openings formed at the bottom and top, and the detection cylinder is detachably connected to a bottom cover and a top cover at the two barrel openings respectively; a through hole is provided on the bottom wall of the bottom cover, and when the bolt is locked, the bolt rod passes through the through hole and passes through the bottom cover to lock into the component, and a first accommodating chamber for accommodating an identification member that can be connected to the bolt cap is formed inside the bottom cover; a second accommodating chamber connected to the first accommodating chamber is formed inside the detection cylinder and the top cover, and the second accommodating chamber accommodates an image acquirer that can obtain an image of the identification member and send the image to an external processing terminal.

[0008] On the basis of the above technical solution, the present invention can be improved as follows:

[0009] Furthermore, the identification part is a circular ring, which includes a circular outer ring and a polygonal inner ring corresponding to the shape of the bolt cap. The inner ring of the circular ring cooperates with the bolt cap to install the circular ring on the bolt cap and rotate with the bolt cap; an identification line is provided on the top surface of the circular ring.

[0010] Furthermore, a limiting portion is provided in the detection cylinder near the bottom opening, and the limiting portion can limit the axial movement of the identification member when the detection cylinder is connected to the bottom cover.

[0011] Furthermore, the limiting portion is an annular flange, and when the detection cylinder is connected to the bottom cover, the annular flange abuts against the top of the identification member.

[0012] Furthermore, the image acquirer includes a camera and an annular fill light, the camera is arranged on the axis of the detection tube, and the annular fill light is arranged around the camera and is coaxial with the camera.

[0013] Furthermore, a photovoltaic module that can convert solar energy into electrical energy is provided on the top surface of the top cover, and a power supply module is provided inside the top cover. The power supply module is used to store the electrical energy converted by the photovoltaic module and supply power to the camera and the annular fill light respectively.

[0014] Compared with the existing technology, the technology of this utility model has the following advantages:

[0015] The utility model provides a through hole on the bottom wall of the bottom cover so that the bolt rod can be inserted through the bottom cover to lock the component when the bolt is locked. At this time, the bolt cap abuts the bottom wall of the bottom cover, so that the bottom cover is fastened to the locking surface of the component. An identification piece is connected to the bolt cap, and an image acquirer is provided in the detection tube. When the bolt is loosened, the bolt rod rotates, driving the bolt cap to rotate, and the identification piece rotates accordingly. The image of the identification piece is acquired by the image acquirer, and the image is sent to an external processing terminal for position comparison to detect the loosening of the bolt. The entire detection process is non-contact detection, which can avoid resonance false alarms. After the detection tube, bottom cover and top cover are connected to each other, a closed detection space can be formed, which can block the influence of the external environment, thereby improving the detection sensitivity and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 Schematic diagram of disassembly and assembly of a bolt loosening detection device based on a coaxial light source in an embodiment;

[0018] Figure 2 Schematic diagram of the internal structure of the bolt loosening detection device based on the coaxial light source in the embodiment.

[0019] Markings on the attached drawings: 1-bolt, 1a-bolt cap, 1b-bolt rod, 2-detection tube, 2a-annular flange, 3-bottom cover, 4-top cover, 5-ring, 6-marking line, 7-camera, 8-annular fill light, 9-photovoltaic module, 10-power supply module. DETAILED DESCRIPTION

[0020] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. The description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] See also Figure 1 and Figure 2 The present embodiment relates to a bolt loosening detection device based on a coaxial light source. The bolt 1 to be detected includes a bolt cap 1a and a bolt rod 1b arranged on the bottom surface of the bolt cap 1a, and the bolt rod 1b is provided with an external thread; when locking a component, the bolt rod 1b is threadedly connected to a threaded hole provided on the component, and the bottom surface of the bolt cap 1a is in contact with the locking surface of the component to complete the locking; when the bolt 1 is loose, the bolt rod 1b rotates relative to the threaded hole on the component, and accordingly drives the bolt cap 1a to rotate; by connecting the bolt loosening detection device in this embodiment to the bolt 1 and obtaining the rotation change image of the bolt cap 1a in an image recognition manner, the bolt 1 can be detected for loosening.

[0022] The bolt loosening detection device in this embodiment includes a detachably connected detection cylinder 2, a bottom cover 3 and a top cover 4, an identification member arranged in the detection cylinder 2 and capable of cooperating with the bolt cap 1a, and an image acquirer capable of acquiring an image of the identification member; the detection cylinder 2 has an annular side wall, the top cover 4 has an annular side wall and a top wall, and the bottom cover 3 has an annular side wall and a bottom wall.

[0023] The bottom of the bottom cover 3 contacts the locking surface of the component. A through-hole is provided at the center of the bottom wall of the bottom cover 3. The bolt 1 passes through the through-hole and is locked into the threaded hole on the component. When the bolt 1 is locked, the bolt cap 1a abuts against the bottom wall of the bottom cover 3 to fix the bottom cover 3 on the locking surface of the component. At this time, the bottom surface of the bottom cover 3 is in contact with the locking surface of the component; the identification member is mounted on the bolt cap 1a, and a first accommodating chamber for accommodating the bolt cap 1a and the identification member is formed inside the bottom cover 3. The identification member can rotate with the bolt cap 1a in the first accommodating chamber; the image acquirer is detachably arranged in the top cover 4, and a second accommodating chamber for accommodating the image acquirer is formed inside the detection tube 2 and the top cover 4; the first accommodating chamber and the second accommodating chamber are connected to each other. The image acquirer can continuously acquire the identification member position image in the first accommodating chamber in the second accommodating chamber, and send the identification member position image to the external processing terminal for identification position comparison and analysis to detect the loosening of the bolt in real time.

[0024] Specifically, the detection tube 2 is a hollow cylindrical structure, the top of the detection tube 2 forms a first tube opening, and the bottom of the detection tube 2 forms a second tube opening; the top cover 4 is detachably connected to the first tube opening of the detection tube 2, and allows the image acquirer to extend into the detection tube 2, and the bottom cover 3 is detachably connected to the second tube opening of the detection tube 2; in this embodiment, the detection tube 2, the top cover 4 and the bottom cover 3 are interconnected to form a closed detection space, which can isolate the interference of the external environment to ensure the quality of image acquisition, while protecting the image acquirer and the identification component and extending the service life.

[0025] The inner surface of the annular side wall of the detection cylinder 2 is provided with internal threads at the first barrel opening and the second barrel opening respectively, and the outer surfaces of the annular side walls of the top cover 4 and the bottom cover 3 are provided with external threads. The top cover 4 is threadedly connected to the first barrel opening of the detection cylinder 2, and the bottom cover 3 is threadedly connected to the second barrel opening of the detection cylinder 2. It should be noted that although a threaded connection structure is adopted between the detection cylinder 2, the top cover 4 and the bottom cover 3 in this embodiment, other detachable connection structures can also be adopted instead according to actual needs, such as a snap-fit ​​structure or a mortise and tenon structure in the prior art.

[0026] The identification member is a circular ring 5, which includes a circular outer ring and a polygonal inner ring. The inner ring of the circular ring 5 cooperates with the bolt cap 1a to install the circular ring 5 on the bolt cap 1a, and can rotate with the bolt cap 1a when the bolt 1 is loosened. In this embodiment, the bolt 1 is a hexagonal bolt 1, and the bolt cap 1a is hexagonal. Accordingly, the inner ring of the circular ring 5 is hexagonal. An identification line 6 is provided on the top surface of the circular ring 5.

[0027] During specific implementation, the ring 5 is matched with the bolt cap 1a. At this time, the position of the identification line 6 on the ring 5 is used as the reference position. The detection tube 2 is connected to the bottom cover 3, and the image acquirer is started to shoot the ring 5, and the acquired initial image of the ring 5 is sent to the external processing terminal; the image acquirer continues to shoot the ring 5, and sends the obtained subsequent images of the ring 5 to the external processing terminal for comparison with the initial image of the ring 5; when the position of the identification line 6 in the initial image of the ring 5 is consistent with the position of the identification line 6 in the subsequent image of the ring 5, the bolt 1 remains locked; when the position of the identification line 6 in the initial image of the ring 5 is inconsistent with the position of the identification line 6 in the subsequent image of the ring 5, the bolt 1 becomes loose. At this time, the external processing terminal sends an alarm signal to remind the maintenance personnel to perform maintenance.

[0028] A limiting portion is provided on the inner surface of the annular side wall of the detection cylinder 2 near the second cylinder opening, and the limiting portion is used to limit the axial movement of the identification member. In this embodiment, the limiting portion on the detection cylinder 2 is an annular flange 2a. When the detection cylinder 2 is connected to the bottom cover 3, the annular flange 2a abuts the top of the identification member to limit the axial movement of the identification member and prevent the identification member from detaching from the bolt cap 1a when the components vibrate.

[0029] The image acquirer includes a camera 7 arranged on the axis of the detection tube 2, and a ring-shaped fill light 8 arranged around the camera 7. The ring-shaped fill light serves as a light source and illuminates the identification part. The camera 7 is used to capture the image of the identification part and send it to an external processing terminal. Since the ring-shaped fill light 8 and the camera 7 are coaxial, local shadows can be avoided, the acquired image is clearer, and the detection accuracy is improved.

[0030] When the top cover 4 is connected to the first tube mouth of the detection tube 2, the bottom surface of the top cover 4 is in contact with the top surface of the detection tube 2; a support frame is provided on the bottom surface of the top cover 4, and the support frame is used to install the camera 7 and the ring fill light on the bottom surface of the top cover 4, and arrange the camera 7 and the ring fill light coaxially.

[0031] A photovoltaic module 9 is provided on the top surface of the top cover 4, and a power supply module 10 is provided on the inner surface of the annular side wall of the top cover 4. The photovoltaic module 9 is connected to the power supply module 10 through a cable passing through the top cover 4. A wire hole for the cable to pass through is opened on the top wall of the top cover 4. The power supply module 10 is connected to the camera 7 and the annular fill light 8 respectively through cables; the photovoltaic module 9 is used to convert solar energy into electrical energy and store it in the power supply module 10, and the power supply module 10 is used to supply power to the camera 7 and the annular fill light 8.

[0032] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the implementation methods of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structure of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, should fall within the scope of protection of the present invention.

Claims

1. A bolt loosening detection device based on a coaxial light source, comprising a detection cylinder with openings formed at the bottom and top, wherein the detection cylinder is detachably connected to a bottom cover and a top cover at the two openings; characterized in that: A through hole is provided on the bottom wall of the bottom cover. When the bolt is locked, the bolt rod passes through the through hole and locks into the component through the bottom cover, and a first accommodating chamber for accommodating an identification member that can be connected to the bolt cap is formed inside the bottom cover; a second accommodating chamber connected to the first accommodating chamber is formed inside the detection cylinder and the top cover, and the second accommodating chamber accommodates an image acquirer that can obtain an image of the identification member and send the image to an external processing terminal.

2. The bolt loosening detection device based on coaxial light source according to claim 1 is characterized in that: The identification part is a circular ring, which includes a circular outer ring and a polygonal inner ring corresponding to the shape of the bolt cap. The inner ring of the circular ring cooperates with the bolt cap to install the circular ring on the bolt cap and rotate with the bolt cap; an identification line is set on the top surface of the circular ring.

3. The bolt loosening detection device based on coaxial light source according to claim 1 is characterized in that: A limiting portion is provided in the detection cylinder near the bottom opening, and the limiting portion can limit the axial movement of the identification member when the detection cylinder is connected to the bottom cover.

4. The bolt loosening detection device based on coaxial light source according to claim 3 is characterized in that: The limiting portion is an annular flange, and when the detection cylinder is connected to the bottom cover, the annular flange abuts against the top of the identification member.

5. The bolt loosening detection device based on a coaxial light source according to any one of claims 1 to 4, characterized in that: The image acquirer includes a camera and an annular fill light. The camera is arranged on the axis of the detection tube. The annular fill light is arranged around the camera and is coaxial with the camera.

6. The bolt loosening detection device based on coaxial light source according to claim 5, characterized in that: The top surface of the top cover is provided with a photovoltaic module which can convert solar energy into electrical energy. A power supply module is provided inside the top cover. The power supply module is used to store the electrical energy converted by the photovoltaic module and supply power to the camera and the annular fill light respectively.

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