A bolt loosening online monitoring device

Abstract

The present invention discloses an online monitoring device for bolt loosening, which includes a first sensing unit, a second sensing unit, and a nut sleeve. The first sensing unit includes a first end cover and a second end cover, the first end cover includes a first cover plate and a first protrusion, the second end cover includes a second cover plate and a second protrusion, and the first protrusion is provided with a sensing sheet; the second sensing unit includes a sensing assembly and a shell, the second cover plate is rotatably connected to the shell, the second cover plate and the shell form a first accommodating space, and the sensing assembly is provided in the first accommodating space; the nut sleeve is sleeved on the shell, and the nut sleeve is used to set the nut to be tested. In the present invention, when the bolt to be tested and the nut to be tested rotate relative to each other, the sensing sheet and the angle conversion device rotate relative to each other, and the relative rotation of the nut and the stud is converted into an electrical signal, the analog quantity is converted into a digital quantity through the sensing assembly, and the digital quantity is then sent to the staff.

Description

Technical Field

[0001] The present invention relates to the field of special equipment detection, and in particular to an online monitoring device for bolt loosening. Background Art

[0002] During operation, tower cranes generate alternating loads on high-strength bolts. This, combined with vibrations from the external environment, can easily cause these bolts to loosen. If loose bolts are not discovered promptly, further use of the crane can create shear forces on the bolts, causing them to break and potentially causing accidents.

[0003] Currently, the loosening of high-strength bolts of tower cranes is usually discovered through regular manual inspection or by using the marking method to mark the two nuts of the bolts. The above two methods are time-consuming and labor-intensive, and the loose bolts are discovered relatively late, and the loose bolts cannot be pre-tightened in time, posing a safety hazard. Summary of the Invention

[0004] In order to solve at least one of the above technical problems, the present invention provides an online monitoring device for bolt loosening, and the technical solution adopted is as follows:

[0005] The present invention provides an online monitoring device for bolt loosening, which includes a first sensing unit, a second sensing unit, and a nut sleeve. The first sensing unit includes a first end cover and a second end cover. The first end cover includes a first cover plate and a first protrusion. The first protrusion is arranged in the middle of the first cover plate. The second end cover includes a second cover plate and a second protrusion. The second protrusion is arranged in the middle of the second cover plate. The second protrusion is hollow. The first protrusion is inserted into the second protrusion. An induction sheet is arranged on the first protrusion. The middle of the second protrusion is A connecting hole is provided, and the sensing piece passes through the connecting hole; the second sensing unit includes a sensing component and a shell, the shell is hollow, the second cover plate is located in the shell, the second cover plate is rotatably connected to the shell, the second cover plate and the shell form a first accommodating space, the sensing component is arranged in the first accommodating space, an angle conversion device is provided on the sensing component, and the sensing piece is connected to the angle conversion device; the nut sleeve is sleeved on the shell, the relative position between the nut sleeve and the shell is stable, and the nut sleeve is used to set the nut to be measured.

[0006] The embodiments of the present invention have at least the following beneficial effects: in the present invention, the bolt to be tested and the first end cover are relatively stationary, the first end cover and the second end cover are relatively stationary, so that the relative position between the sensing plate and the bolt to be tested is stable, the nut to be tested and the nut sleeve are relatively stationary, and the nut sleeve and the shell are relatively stationary, so that the relative position between the second sensing unit and the nut to be tested is stable; when the bolt to be tested and the nut to be tested rotate relative to each other, the sensing plate and the angle conversion device rotate relative to each other, and the relative rotation between the nut and the stud is converted into an electrical signal, the analog quantity is converted into a digital quantity through the sensing component, and then the digital quantity is sent to the staff, so that the staff can promptly and effectively discover loose bolts, realize online monitoring of loose bolts, and avoid safety accidents caused by loose tower crane bolts.

[0007] In certain embodiments of the present invention, the first sensing unit further includes a magnetic component, the end face of the bolt to be tested can abut against the first cover plate, the magnetic component is used to attract the end of the bolt to be tested, and double-sided tape is provided between the first cover plate and the end face of the bolt to be tested.

[0008] In certain embodiments of the present invention, the nut sleeve includes a first straight portion, an inclined portion, and a second straight portion. The inner wall of the first straight portion is set to a prismatic shape. The first straight portion is used to be sleeved on the nut to be tested so that the nut sleeve rotates together with the nut to be tested. The inclined portion is located between the first straight portion and the second straight portion. The first straight portion is angled to the inclined portion, and the second straight portion is angled to the inclined portion. The inner wall of the second straight portion includes a gap portion and a fitting portion. A first step is provided at the connection between the gap portion and the fitting portion. A gap is provided between the gap portion and the first sensing unit, and the fitting portion is sleeved with the outer wall of the shell.

[0009] In certain embodiments of the present invention, the matching portion is configured to be prismatic, and the shape of the outer wall of the shell corresponds to the shape of the matching portion, so that the shell rotates together with the nut sleeve.

[0010] In some embodiments of the present invention, a second step is provided on the inner wall of the housing, and the second cover plate abuts against an end surface of the second step.

[0011] In some embodiments of the present invention, the outer wall of the first protrusion is configured to be prismatic, and the inner wall of the second protrusion corresponds to the outer wall of the first protrusion, so that the relative positions of the first end cover and the second end cover are stable.

[0012] In certain embodiments of the present invention, a second accommodating space is formed between the first cover plate and the second cover plate, and a sealing cover is provided in the second accommodating space. The sealing cover includes a first extension portion, a bent portion, and a second extension portion. The bent portion is located between the first extension portion and the second extension portion. The first extension portion extends toward the first cover plate, and the second extension portion extends toward the second protrusion. The end portion of the shell extends into the second accommodating space, and the end portion of the shell is connected to the bent portion by curing with glue.

[0013] In some embodiments of the present invention, an abutting component is provided at the end of the first protrusion, and the abutting component abuts against the first end of the sensor plate.

[0014] In certain embodiments of the present invention, the sensor component is fixed in the shell by potting glue, the sensor component includes an analog conversion board, a main control board, and a Bluetooth communication board, the angle conversion device is arranged on the analog conversion board, and the analog conversion board is electrically connected to the main control board.

[0015] In some embodiments of the present invention, a groove is provided on the angle conversion device, and the second end of the sensor plate is disposed in the groove.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0018] Figure 1 It is a structural schematic diagram of the on-line monitoring device for bolt loosening of the present invention;

[0019] Figure 2 is a cross-sectional view of the on-line monitoring device for bolt loosening of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the first end cover in the on-line monitoring device for bolt loosening of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the second end cover in the on-line monitoring device for bolt loosening of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the sealing cover in the on-line monitoring device for bolt loosening of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the housing in the on-line monitoring device for bolt loosening of the present invention;

[0024] Figure 7 It is a structural schematic diagram of a nut sleeve in the on-line monitoring device for bolt loosening of the present invention;

[0025] Figure 8 It is a cross-sectional view of a nut sleeve in the on-line monitoring device for bolt loosening of the present invention.

[0026] Reference numerals:

[0027] 101. First end cap; 102. Second end cap; 103. First cover plate; 104. First raised portion; 105. Second cover plate; 106. Second raised portion; 107. Sensor plate;

[0028] 201. Housing; 202. Second step; 203. Sealing cover; 204. First extension; 205. Bend; 206. Second extension; 207. Analog conversion board;

[0029] 301. Nut sleeve; 302. First straight portion; 303. Inclined portion; 304. Second straight portion; 305. First step. DETAILED DESCRIPTION

[0030] This section will combine Figures 1 to 8 Embodiments of the present invention are described in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The features defined as "first" and "second" are used to distinguish the feature names, and do not have special meanings. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] like Figures 1 to 2 As shown, an embodiment of the present invention provides an online monitoring device for bolt loosening, which includes a first sensor unit, a second sensor unit, and a nut sleeve 301.

[0034] The first sensing unit and the bolt to be tested remain relatively stationary to avoid relative rotation between the first sensing unit and the bolt to be tested; the second sensing unit and the nut to be tested remain relatively stationary to avoid relative rotation between the second sensing unit and the nut to be tested. When the bolt to be tested and the nut to be tested rotate relative to each other, the first sensing unit and the second sensing unit rotate relative to each other. The loosening of the bolt is monitored by measuring and quantifying the relative rotation between the first sensing unit and the second sensing unit.

[0035] The first sensing unit includes a first end cap 101 and a second end cap 102. The relative positions of the first end cap 101 and the second end cap 102 are stable to avoid relative rotation between the first end cap 101 and the second end cap 102. Figure 3 As shown, the first end cover 101 includes a first cover plate 103 and a first protrusion 104. The first protrusion 104 is arranged in the middle of the first cover plate 103. To facilitate the rotation of the first sensing unit, the first cover plate 103 is arranged in a circular shape, and the first protrusion 104 is arranged at the center of the first cover plate 103.

[0036] like Figure 4 As shown, the second end cap 102 includes a second cover plate 105 and a second protrusion 106. The second protrusion 106 is disposed in the middle of the second cover plate 105. To facilitate the rotation of the first sensing unit, the second cover plate 105 is also configured in a circular shape, and the second protrusion 106 is disposed at the center of the circle of the second cover plate 105. Furthermore, the first end cap 101 and the second end cap 102 are connected via the first protrusion 104 and the second protrusion 106. The second protrusion 106 is hollow and can be inserted into the second protrusion 106 to complete the connection. To ensure a tight connection between the first end cap 101 and the second end cap 102 and prevent shaking, the outer wall shape of the first protrusion 104 is approximately the same as the inner wall shape of the second protrusion 106.

[0037] To facilitate axial positioning between the first end cover 101 and the second end cover 102, a third step is provided on the sidewall of the first raised portion 104. The outer diameter of the first raised portion 104 from the third step to the first cover plate 103 is approximately the same as the outer diameter of the second raised portion 106. It will be understood that the extreme position of the second raised portion 106 is when the second raised portion 106 abuts the stepped surface of the third step, thereby defining the axial relative position between the first end cover 101 and the second end cover 102.

[0038] An induction sheet 107 is provided on the first raised portion 104. The induction sheet 107 is located at the end of the first raised portion 104. A connecting hole is provided in the middle of the second raised portion 106. The induction sheet 107 is connected to the second sensing unit through the connecting hole. The first sensing unit and the second sensing unit transmit the relative rotation trend of the bolt to be tested and the nut to be tested through the induction sheet 107.

[0039] In some examples, to ensure that the bolt to be tested and the first sensing unit are always connected, the first sensing unit further includes a magnetic component that attracts the end of the bolt to be tested, ensuring that the end of the bolt to be tested always remains in contact with the first cover plate 103. Even when the bolt to be tested is in contact with the first cover plate 103, relative rotation between the bolt to be tested and the first cover plate 103 may still occur. Therefore, double-sided tape is provided between the first cover plate 103 and the bolt to be tested to prevent relative rotation between the bolt to be tested and the first cover plate 103, thereby transmitting the rotational tendency of the bolt to be tested to the first sensing unit.

[0040] In some examples, the bolt under test transmits its rotational tendency to the first end cap 101. The first end cap 101 then needs to further transmit the rotational tendency of the bolt under test to the sensing plate 107 via the second end cap 102. Therefore, it is necessary to ensure the positional stability between the first end cap 101 and the second end cap 102, that is, to prevent relative rotation between the first end cap 101 and the second end cap 102. The outer wall of the first protrusion 104 is prismatic, and the inner wall of the second protrusion 106 is also prismatic. The edges of the outer wall of the first protrusion 104 engage with the grooves of the inner wall of the second protrusion 106, thereby transmitting the rotational force from the first protrusion 104 to the second protrusion 106. Because the shape of the connecting hole corresponds to that of the sensing plate 107, relative rotation between the sensing plate 107 and the second end cap 102 is prevented, and the rotational tendency can be transmitted to the sensing plate 107.

[0041] In some examples, an abutment component is provided at the end of the first protrusion 104, which abuts against the first end of the sensing sheet 107, thereby pushing the sensing sheet 107 into the second sensing unit. For different heights of the second sensing units, the height of the sensing sheet 107 can change under the premise that the abutment component is pressed and the connection is ensured, that is, the sensing sheet 107 can dynamically adapt to different heights of the second sensing unit to ensure the effectiveness of the connection between the sensing sheet 107 and the second sensing unit.

[0042] In some examples, the sensor plate 107 is connected to an angle converter within the second sensor unit. The angle converter has a groove, into which the second end of the sensor plate 107 is inserted. The degree of looseness of the bolt to be tested is monitored by measuring the rotation angle of the sensor plate 107 relative to the angle converter.

[0043] The second sensing unit includes a sensing component and a housing 201 . The housing 201 is used to accommodate the sensing component.

[0044] like Figure 6 As shown, the housing 201 is hollow, and the second cover plate 105 is located within the housing 201. The second cover plate 105 is rotatably connected to the housing 201. When relative rotation occurs between the bolt to be tested and the nut to be tested, the second cover plate 105 rotates within the housing 201. The second cover plate 105 and the housing 201 enclose a first accommodating space, the sensor assembly is disposed within the first accommodating space, and the angle conversion device is disposed on the sensor assembly. The housing 201 and the sensor assembly form an integral unit. When a tower crane bolt is loose, the relative rotation between the nut to be tested and the bolt to be tested is converted into an electrical signal on the sensor assembly. The electrical signal is further converted from analog to digital, and the digital signal is then transmitted to a staff member, thereby monitoring the loosening of the bolt.

[0045] In some examples, the inner wall of the housing 201 is provided with a second step 202 , and the second cover plate 105 abuts against the end surface of the second step 202 , thereby limiting the axial position of the second end cover 102 and ensuring a firm connection between the first sensing unit and the second sensing unit.

[0046] In some examples, a second accommodation space is formed between the first cover plate 103 and the second cover plate 105. Figure 5 As shown, a sealing cover 203 is provided in the second accommodating space. The sealing cover 203 ensures that the first sensing unit and the second sensing unit are independent of each other on the one hand, and further ensures that the first sensing unit and the second sensing unit are stably connected on the other hand.

[0047] The sealing cover 203 includes a first extension 204, a bent portion 205, and a second extension 206. The bent portion 205 is located between the first extension 204 and the second extension 206. The first extension 204 extends toward the first cover plate 103 to ensure the axial stability of the sealing cover 203 within the second accommodating space and prevent the sealing cover 203 from shaking within the second accommodating space. The second extension 206 extends toward the second protrusion 106. The bent portion 205 is fixedly connected to the open end of the housing 201. It is understood that the open end of the housing 201 extends into the second accommodating space and is connected to the bent portion 205 by curing glue. Since the sealing cover 203 is clamped in the second accommodating space by the second extension 206, the position of the housing 201 is further stabilized.

[0048] Specifically, the open end of the shell 201 is provided with a first inclined surface, and the bent portion 205 is provided with a second inclined surface. The first inclined surface abuts the second inclined surface to expand the contact area between the bent portion 205 and the open end of the shell 201 to ensure connection stability.

[0049] In some examples, the sensor assembly is secured within the housing 201 with potting compound, allowing it to rotate synchronously with the housing 201, thereby ensuring monitoring accuracy and enhancing the structural strength of the second sensor unit. The sensor assembly includes an analog conversion board 207, a main control board, and a Bluetooth communication board. The angle conversion device is mounted on the analog conversion board 207, which is electrically connected to the main control board via a flat cable to ensure smooth signal transmission. The Bluetooth communication board wirelessly transmits data on the monitored bolts and nuts to personnel.

[0050] like Figure 7 As shown, in some examples, the nut sleeve 301 is sleeved on the housing 201, and the nut to be tested is located in the nut sleeve 301, ensuring that the relative position of the nut to be tested and the nut sleeve 301 is stable, and preventing the nut to be tested and the nut sleeve 301 from rotating relative to each other. It is understandable that the relative position of the nut sleeve 301 and the housing 201 must also be kept stable to prevent the nut sleeve 301 and the housing 201 from rotating relative to each other, thereby transmitting the rotation trend of the nut to be tested to the housing 201, that is, to the second sensing unit, and ultimately causing the same movement trend as that of the bolt and nut to be tested to be generated between the sensing piece 107 and the angle conversion device.

[0051] like Figure 8As shown, in some examples, the nut sleeve 301 includes a first straight portion 302, an inclined portion 303, and a second straight portion 304. The inner wall of the first straight portion 302 is configured as a prismatic column to facilitate fitting onto the nut to be tested and prevent relative rotation between the nut to be tested and the nut sleeve 301. The inclined portion 303 is located between the first straight portion 302 and the second straight portion 304. Due to the larger size of the nut to be tested, the diameter of the first straight portion 302 is larger than the diameter of the second straight portion 304. The inclined portion 303 serves as a transition portion between the first straight portion 302 and the second straight portion 304. It will be understood that the inclined portion 303 forms an angle with the first straight portion 302, and the inclined portion 303 forms an angle with the second straight portion 304.

[0052] The inner wall of the second straight portion 304 includes a gap portion and a fitting portion. A first step 305 is provided at the connection between the gap portion and the fitting portion, that is, the inner diameter of the gap portion is larger than the inner diameter of the fitting portion. The gap portion surrounds the outside of the first sensing unit, and a gap is provided between the gap portion and the first sensing unit to avoid friction affecting the measurement accuracy of relative rotation. The fitting portion abuts against the outer wall of the shell 201.

[0053] In some examples, the mating portion is configured to be prismatic, and correspondingly, the outer wall shape of the shell 201 is also configured to be prismatic, and the edges of the outer wall of the shell 201 are inserted into the grooves of the mating portion, thereby preventing relative rotation between the shell 201 and the nut sleeve 301.

[0054] Throughout this specification, references to "one embodiment," "some examples," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" refer to specific features, structures, materials, or characteristics described in conjunction with the embodiment or example in at least one embodiment or example of the present invention. In this specification, the illustrative use of these terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An online monitoring device for bolt loosening, characterized in that: include: The first sensing unit comprises a first end cover and a second end cover, the first end cover comprises a first cover plate and a first protrusion, the first protrusion is arranged in the middle of the first cover plate, the second end cover comprises a second cover plate and a second protrusion, the second protrusion is arranged in the middle of the second cover plate, the second protrusion is hollow, the first protrusion is inserted into the second protrusion, an induction sheet is provided on the first protrusion, a connecting hole is provided in the middle of the second protrusion, the induction sheet passes through the connecting hole, the first sensing unit further comprises a magnetic component, the end face of the bolt to be tested can abut against the first cover plate, the magnetic component is used to attract the end of the bolt to be tested, and double-sided tape is provided between the first cover plate and the end face of the bolt to be tested; the outer wall of the first protrusion is arranged in a prismatic shape, and the inner wall shape of the second protrusion corresponds to the outer wall shape of the first protrusion, so that the relative position of the first end cover and the second end cover is stable; a second sensing unit, the second sensing unit comprising a sensing assembly and a shell, the shell being hollow, the second cover being located within the shell, the second cover being rotatably connected to the shell, the second cover and the shell forming a first accommodating space, the sensing assembly being disposed within the first accommodating space, the sensing assembly being provided with an angle conversion device, the sensing sheet being connected to the angle conversion device, a second accommodating space being formed between the first cover and the second cover, a sealing cover being disposed within the second accommodating space, the sealing cover comprising a first extension, a bent portion, and a second extension, the bent portion being located between the first extension and the second extension, the first extension extending toward the direction of the first cover, the second extension extending toward the direction of the second protrusion, an end portion of the shell extending into the second accommodating space, and the end portion of the shell being connected to the bent portion by curing with glue; A nut sleeve is sleeved on the shell, the relative position between the nut sleeve and the shell is stable, and the nut sleeve is used to set the nut to be tested.

2. The on-line monitoring device for bolt loosening according to claim 1, characterized in that: The nut sleeve includes a first straight portion, an inclined portion, and a second straight portion. The inner wall of the first straight portion is set to a prismatic shape. The first straight portion is used to be sleeved on the nut to be tested so that the nut sleeve rotates together with the nut to be tested. The inclined portion is located between the first straight portion and the second straight portion. The first straight portion is at an angle to the inclined portion, and the second straight portion is at an angle to the inclined portion. The inner wall of the second straight portion includes a gap portion and a fitting portion. A first step is provided at the connection between the gap portion and the fitting portion. A gap is provided between the gap portion and the first sensing unit, and the fitting portion is sleeved with the outer wall of the shell.

3. The on-line monitoring device for bolt loosening according to claim 2, characterized in that: The matching portion is configured in a prism shape, and the outer wall shape of the shell corresponds to the shape of the matching portion, so that the shell rotates along with the nut sleeve.

4. The on-line monitoring device for bolt loosening according to claim 1, characterized in that: The inner wall of the shell is provided with a second step, and the second cover plate abuts against an end surface of the second step.

5. The on-line monitoring device for bolt loosening according to claim 1, characterized in that: An abutting component is provided at the end of the first protrusion, and the abutting component abuts against the first end of the sensor sheet.

6. The on-line monitoring device for bolt loosening according to claim 1, characterized in that: The sensor assembly is fixed in the shell by potting glue. The sensor assembly includes an analog conversion board, a main control board, and a Bluetooth communication board. The angle conversion device is arranged on the analog conversion board, and the analog conversion board is electrically connected to the main control board.

7. The on-line monitoring device for bolt loosening according to claim 6, characterized in that: The angle conversion device is provided with a groove, and the second end of the sensing piece is provided in the groove.

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