Intelligent sensing bolt

Abstract

The utility model provides an intelligent sensing bolt which comprises a metal bolt body and a sensor assembly, and the sensor assembly is installed on the metal bolt body. The metal bolt body is provided with a circular blind hole extending from the top to the bottom, and the circular blind hole and the metal bolt body are coaxially arranged. The sensor assembly comprises a ring-column-shaped strain gauge, and the ring-column-shaped strain gauge is installed around the inner side wall of the circular blind hole in an attached mode. The intelligent sensing bolt provided by the utility model can improve the detection precision of the pretightening force of the bolt.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent bolt technical field, specifically, and relates to an intelligent sensing bolt. BACKGROUND

[0002] In the practical application process of the bolt in the power equipment and structure, on the one hand, it is used for connecting and fastening the power hardware and cable, and the fastening degree state is expressed as axial pre-tightening force, and the pre-tightening force size is directly related to the reliability and installation of the whole equipment or structure work. On the other hand, the power cable bridge (i.e. the bolt fastening place) is prone to cause heating and fire due to load, aging, bolt loosening and other reasons, and its performance is the temperature change at the bolt. In different bolt application environments, due to overload, high temperature, high pressure, high frequency vibration and other impacts, the bolt is often loose, overheated, causes overhead line to fall, equipment to burn and other accidents, causes economic loss and personnel casualty, therefore, it is very necessary for the bolt to have temperature change online monitoring and pre-tightening force warning capability for bolt anti-loosening fastening.

[0003] In an existing intelligent bolt, a blind hole extending along the axial direction of the bolt body is arranged in the bolt body, a strain gauge and a temperature sensor are installed in the blind hole, and the pre-tightening force and the temperature of the bolt are detected. However, in the scheme, the temperature sensor and the strain gauge are integrally arranged, the temperature sensor and the strain gauge are placed in the blind hole, and then fixed by filling glue. However, the installation mode of the strain gauge lacks direct contact with the intelligent bolt, and the detection precision is low.

[0004] Therefore, it is necessary to consider a more optimized intelligent sensing bolt. INVENTION CONTENTS

[0005] The main purpose of the utility model is to provide an intelligent sensing bolt capable of improving the pre-tightening force detection precision of the bolt.

[0006] In order to realize the above-mentioned main purpose, the utility model provides an intelligent sensing bolt which comprises a metal bolt body and a sensor assembly, the sensor assembly is installed on the metal bolt body, the metal bolt body is provided with a circular blind hole extending from the top to the bottom direction, and the circular blind hole is coaxially arranged with the metal bolt body; the sensor assembly comprises a ring column strain gauge, and the ring column strain gauge is installed in close contact with the inner side wall of the circular blind hole.

[0007] From the above-mentioned scheme, the intelligent sensing bolt of the utility model is provided with the ring column strain gauge, the ring column strain gauge is installed in close contact with the inner side wall of the circular blind hole, the ring column strain gauge is coaxially arranged with the bolt, so that the stress of the ring column strain gauge can better reflect the pre-tightening force of the bolt, and the pre-tightening force detection precision of the bolt is improved.

[0008] In a further scheme, the sensor assembly further comprises a temperature sensing device, and the temperature sensing device is installed in the circular blind hole.

[0009] Therefore, by installing the temperature sensing device in the circular blind hole, the temperature of the bolt can be detected.

[0010] In a further aspect, the circular blind hole comprises an upper end hole and a lower end hole, the upper end hole and the lower end hole are sequentially arranged from the top to the bottom of the metal bolt body; the temperature sensing device is located in the upper end hole, and the ring column-shaped strain gauge is located in the lower end hole.

[0011] Therefore, by setting the upper end hole and the lower end hole in the circular blind hole, the temperature sensing device and the ring column-shaped strain gauge are installed respectively, which can avoid installation interference and affect the detection accuracy.

[0012] In a further aspect, the sensor assembly further comprises a bottom disc, a top cover and a circuit assembly, the bottom disc and the top cover are detachably connected, the bottom disc and the top cover cooperate to form a circuit cavity, and the circuit assembly is installed in the circuit cavity; the bottom disc is installed on the top of the metal bolt body.

[0013] Therefore, the bottom disc and the top cover of the sensor assembly are detachably connected, which facilitates disassembly, and the bottom disc and the top cover cooperate to form a circuit cavity for installing the circuit assembly, which can prevent circuit damage.

[0014] In a further aspect, the bottom disc is installed on the top of the metal bolt body by a machine screw, the circular blind hole is provided with a screw thread, and the machine screw is screwed with the screw thread; the machine screw is provided with a through hole penetrating the top and the bottom of the machine screw.

[0015] Therefore, the bottom disc is installed on the top of the metal bolt body by the machine screw, and the machine screw is provided with a through hole penetrating the top and the bottom of the machine screw, which can utilize the through hole for lead function, simplify the structure and miniaturize the structure.

[0016] In a further aspect, the machine screw is made of conductive material, and the top cover is made of semiconductor material; the circuit assembly comprises a power taking circuit, a first input electrode of the power taking circuit is electrically connected with the machine screw, and a second input electrode of the power taking circuit is electrically connected with the top cover.

[0017] Therefore, the machine screw is made of conductive material, and the top cover is made of semiconductor material, which can form two electrodes of the power taking circuit, facilitate power taking in a high-voltage electric field, and thus realize passive and improve the installation convenience of the bolt.

[0018] In a further aspect, the circuit assembly further comprises a rechargeable battery, and the power taking circuit charges the rechargeable battery.

[0019] Therefore, by setting the rechargeable battery, electrical energy storage can be performed to ensure the stability of power supply.

[0020] Further, the anti-rotation limiting block is arranged on one side of the chassis and is in limiting cooperation with a limiting groove arranged on the top of the metal bolt body.

[0021] Therefore, the anti-rotation limiting block arranged on the chassis is in limiting cooperation with the limiting groove arranged on the top of the metal bolt body, so that rotation deviation of the chassis and the metal bolt body during bolt installation is avoided, and line damage is avoided.

[0022] Further, the top of the metal bolt body and the chassis are sealed by a first waterproof sealing ring.

[0023] Further, the top of the metal bolt body and the chassis are sealed by a first waterproof sealing ring.

[0024] Therefore, the anti-rotation limiting block arranged on the chassis is in limiting cooperation with the limiting groove arranged on the top of the metal bolt body, so that rotation deviation of the chassis and the metal bolt body during bolt installation is avoided, and line damage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural diagram of an embodiment of the intelligent sensing bolt.

[0026] Figure 2 is a structural exploded view of the embodiment of the intelligent sensing bolt.

[0027] Figure 3 is a structural cross-sectional view of the embodiment of the intelligent sensing bolt.

[0028] Figure 4 is Figure 3 is an enlarged view of A in FIG.

[0029] Figure 5 is a structural cross-sectional view of the metal bolt body in the embodiment of the intelligent sensing bolt.

[0030] Figure 6 is a structural exploded view of the sensor assembly in the embodiment of the intelligent sensing bolt.

[0031] Figure 7 is a structural diagram of the chassis in the embodiment of the intelligent sensing bolt.

[0032] Figure 8 is a structural cross-sectional view of the machine screw in the embodiment of the intelligent sensing bolt.

[0033] The present application will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0034] Embodiment of the intelligent sensing bolt:

[0035] As shown in Figure 1 and Figure 2 , in the embodiment, the intelligent sensing bolt comprises a metal bolt body 1 and a sensor assembly 2, and the sensor assembly 2 is installed on the top of the metal bolt body 1.

[0036] As shown in Figure 3 , Figure 4 and Figure 5 , the metal bolt body 1 is provided with a circular blind hole 11 extending from the top to the bottom, and the circular blind hole 11 is coaxially arranged with the metal bolt body 1. In the embodiment, the circular blind hole 11 comprises an upper end hole 111 and a lower end hole 112, which are arranged in sequence from the top to the bottom of the metal bolt body 1. The hole diameter of the upper end hole 111 is larger than that of the lower end hole 112. The circular blind hole 11 extends from the top of the metal bolt body 1 to the middle position of the metal bolt body 1.

[0037] As shown in Figure 6 , the sensor assembly 2 further comprises a top cover 21, a bottom plate 22, a circuit assembly 23, a temperature sensing device 24 and a ring column-shaped strain gauge 25. The bottom plate 22 and the top cover 21 cooperate to form a circuit cavity 211, and the circuit assembly 23 is installed in the circuit cavity 211. The bottom plate 22 and the top cover 21 are detachably connected. In the embodiment, the top cover 21 is provided with an internal screw 212, as shown in Figure 7 , the bottom plate 22 is provided with an external screw 221, and the internal screw 212 is screw-connected with the external screw 221. The detachable connection of the bottom plate 22 and the top cover 21 can facilitate disassembly, and at the same time, the bottom plate 22 and the top cover 21 cooperate to form the circuit cavity 211 for installing the circuit assembly 23, which can prevent the circuit from being damaged. The top cover 21 is made of semiconductor plastic by injection molding. The top of the top cover 21 is in spherical shape, which can prevent water accumulation, and at the same time, the surface area of the spherical shape is relatively large compared with the plane, which enhances the power supply capacity. The bottom plate 22 is made of insulating plastic by injection molding.

[0038] The bottom plate 22 is installed on the top of the metal bolt body 1 by a machine screw 26, and the circular blind hole 11 is provided with a screw (not shown), and the machine screw 26 is screw-connected with the screw, so as to install the bottom plate 22 on the top of the metal bolt body 1. As shown in Figure 8 , in the embodiment, the machine screw 26 is provided with a through hole 261 penetrating the top and the bottom of the machine screw 26. The bottom plate 22 is installed on the top of the metal bolt body 1 by the machine screw 26, and the machine screw 26 is provided with the through hole 261 penetrating the top and the bottom of the machine screw 26, which can be used for lead wire, and can simplify the structure and make the structure miniaturized.

[0039] As shown in Figure 7 , in the embodiment, the side of the bottom plate 22 connected with the metal bolt body 1 is provided with an anti-rotation limiting block 222, and the anti-rotation limiting block 222 is arranged in the circular blind hole 11.Figure 2 It can be known that the top of the metal bolt body 1 is provided with a limiting groove 113, and the anti-rotation limiting block 222 is limitedly matched with the limiting groove 113. The anti-rotation limiting block 222 is limitedly matched with the limiting groove 113 on the top of the metal bolt body 1, so that the rotation deviation of the chassis 22 and the metal bolt body 1 can be avoided, thereby preventing the line from being damaged.

[0040] The intersection of the top of the metal bolt body 1 and the chassis 22 is sealed by the first waterproof sealing ring 27. In the embodiment, the bottom of the anti-rotation limiting block 222 is provided with a sealing ring groove 2221, and the first waterproof sealing ring 27 is installed in the sealing ring groove 2221. When the chassis 22 is installed on the top of the metal bolt body 1, the first waterproof sealing ring 27 abuts against the bottom of the limiting groove 113, thereby sealing the intersection of the top of the metal bolt body 1 and the chassis 22. In addition, the intersection of the chassis 22 and the top cover 21 is sealed by the second waterproof sealing ring 28. In the embodiment, the second waterproof sealing ring 28 is sleeved on the outer periphery of the outer screw thread 221. When the chassis 22 and the top cover 21 are tightened, the second waterproof sealing ring 28 seals the intersection of the chassis 22 and the top cover 21. The intersection of the metal bolt body 1 and the chassis 22 is sealed by the first waterproof sealing ring 27, and the intersection of the chassis 22 and the top cover 21 is sealed by the second waterproof sealing ring 28, so that water entering the bolt installed outdoors can be avoided to cause the circuit to be short-circuited.

[0041] The circuit assembly 23 comprises a power taking circuit (not shown) and a rechargeable battery 231. The first input electrode of the power taking circuit is electrically connected with the machine screw 26, and the second input electrode of the power taking circuit is electrically connected with the top cover 21. In the embodiment, the machine screw 26 is made of conductive material, and preferably, the machine screw 26 is made of metal material. The top cover 21 is made of semiconductor material. The machine screw 26 is connected with the metal bolt body 1, thereby forming an input electrode of the power taking circuit, and the second input electrode of the power taking circuit is electrically connected with the top cover 21, thereby forming another input electrode of the power taking circuit. When the metal bolt body 1 is installed on the high-voltage line, since there is a parasitic capacitance between the top cover 21 and the ground, a loop is actually formed between the high-voltage end and the ground, thereby generating a weak current to supply power to the power taking circuit, so as to meet the power supply requirement of the sensor. The power taking circuit adopts a known circuit structure, which will not be described herein. Power is taken in the high-voltage electric field, thereby realizing passive setting and improving the installation convenience of the bolt.

[0042] In the embodiment, the circuit assembly 23 further comprises the rechargeable battery 231, and the power taking circuit charges the rechargeable battery 231. By arranging the rechargeable battery 231, the electrical energy can be stored, thereby guaranteeing the stability of power supply. In addition, the circuit assembly 23 further comprises a wireless communication module (not shown). By arranging the wireless communication module, the wireless transmission of monitoring data can be facilitated.

[0043] In the embodiment, the temperature sensing device 24 and the ring column strain gauge 25 are electrically connected with the circuit assembly 23, and the temperature sensing device 24 and the ring column strain gauge 25 are installed in the circular blind hole 11, and the ring column strain gauge 25 is installed in close contact with the inner side wall of the circular blind hole 11. By installing the temperature sensing device 24 in the circular blind hole 11, the temperature of the bolt can be detected. By arranging the ring column strain gauge 25, the pre-tightening force of the metal bolt body 1 can be detected. In the embodiment, the temperature sensing device 24 is located in the upper end hole 111, and the ring column strain gauge 25 is located in the lower end hole 112. By arranging the upper end hole 111 and the lower end hole 112 to install the temperature sensing device 24 and the ring column strain gauge 25 respectively, the installation interference can be avoided, and the detection accuracy can be affected.

[0044] When installing the temperature sensing device 24 and the ring column strain gauge 25, the ring column strain gauge 25 is inserted into the lower end hole 112 through the through hole 261 of the machine tooth screw 26, and is filled with strain gauge special glue and packaged in the lower end hole 112. After the glue is dry, the temperature sensing device 24 is inserted into the upper end hole 111, and the temperature sensing device 24 is filled with heat-conducting material. Finally, the lead wires of the temperature sensing device 24 and the ring column strain gauge 25 are welded with the circuit assembly 23.

[0045] As can be seen from the above, the intelligent sensing bolt of the utility model is provided with the ring column strain gauge 25, the ring column strain gauge 25 is installed in close contact with the inner side wall of the circular blind hole 11, the ring column strain gauge 25 is coaxially arranged with the bolt, so that the stress of the ring column strain gauge 25 can better reflect the pre-tightening force of the bolt, and the detection accuracy of the pre-tightening force of the bolt is improved.

[0046] It should be noted that the above is only a preferred embodiment of the utility model, but the design concept of the utility model is not limited to this, and any non-essential modification of the utility model made by using the concept also falls within the protection scope of the utility model.

Claims

1. An intelligent sensing bolt, comprising a metal bolt body and a sensor assembly mounted on the metal bolt body; characterized in that: the metal bolt body is provided with a circular blind hole extending from the top to the bottom direction, and the circular blind hole is coaxially arranged with the metal bolt body; the sensor assembly comprises a ring column-shaped strain gauge which is mounted on the inner side wall of the circular blind hole.

2. The intelligent sensing bolt according to claim 1, characterized in that: the sensor assembly further comprises a temperature sensing device mounted in the circular blind hole.

3. The intelligent sensing bolt according to claim 2, characterized in that: the circular blind hole comprises an upper end hole and a lower end hole, and the upper end hole and the lower end hole are sequentially arranged along the top-to-bottom direction of the metal bolt body; the temperature sensing device is located in the upper end hole, and the ring column-shaped strain gauge is located in the lower end hole.

4. The intelligent sensing bolt according to any one of claims 1 to 3, characterized in that: the sensor assembly further comprises a bottom plate, a top cover and a circuit assembly, the bottom plate and the top cover are detachably connected, the bottom plate and the top cover cooperate to form a circuit cavity, and the circuit assembly is mounted in the circuit cavity; the bottom plate is mounted on the top of the metal bolt body.

5. The intelligent sensing bolt according to claim 4, characterized in that: the bottom plate is mounted on the top of the metal bolt body by a machine screw; the circular blind hole is provided with a screw thread, and the machine screw is screwed with the screw thread; the machine screw is provided with a through hole penetrating through the top and the bottom of the machine screw.

6. The intelligent sensing bolt according to claim 5, characterized in that: the machine screw is made of conductive material, and the top cover is made of semiconductor material; the circuit assembly comprises a power taking circuit, a first input electrode of the power taking circuit is electrically connected with the machine screw, and a second input electrode of the power taking circuit is electrically connected with the top cover.

7. The intelligent sensing bolt according to claim 6, characterized in that: the circuit assembly further comprises a rechargeable battery, and the power taking circuit charges the rechargeable battery.

8. The intelligent sensing bolt according to claim 4, characterized in that: one side of the bottom plate connected with the metal bolt body is provided with an anti-rotation limiting block, the top of the metal bolt body is provided with a limiting groove, and the anti-rotation limiting block is limitedly matched with the limiting groove.

9. The intelligent sensing bolt according to claim 8, characterized in that: the intersection of the top of the metal bolt body and the bottom plate is sealed by a first waterproof sealing ring.

10. The intelligent sensing bolt according to claim 4, characterized in that: the intersection of the bottom plate and the top cover is sealed by a second waterproof sealing ring.

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