A sensor for detecting loose screws

Abstract

The present invention discloses a sensor for detecting the loosening of screws, comprising at least one fixed shell, a follower magnet and a detection mechanism, wherein the detection mechanism comprises a fixed block, a reed switch and a signal line, wherein the signal line is connected to the reed switch, the reed switch is fixed to the inner side of the fixed block, the fixed block is fixed to a fixed through hole on the side of the fixed shell, the follower magnet is attached to the side of the bolt, and the follower magnet is arranged opposite to the reed switch. A sensor for detecting the loosening of screws using the above structure can detect whether the bolt is loose in a contactless manner, has a simple structure, is easy to install, has a long service life and is low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, and in particular to a sensor for detecting screw loosening. Background Art

[0002] The tower of a wind turbine is composed of several sections of steel pipes connected by flanges. Bolts often loosen due to vibration or environmental influences, which will cause great safety hazards. Existing bolt loosening detection generally uses mechanical devices, which fatigue over time, resulting in detection failure, short life, inconvenient installation, complex structure, and high cost. Summary of the invention

[0003] The purpose of the present invention is to provide a sensor for detecting screw loosening, which can detect whether the bolt is loose in a contactless manner, has a simple structure, is easy to install, has a long service life and is low in cost.

[0004] To achieve the above-mentioned objectives, the present invention provides a sensor for detecting loose screws, comprising at least one fixed shell, a follower magnet and a detection mechanism, wherein the detection mechanism comprises a fixed block, a reed switch and a signal line, wherein the signal line is connected to the reed switch, the reed switch is fixed to the inner side of the fixed block, the fixed block is fixed in a fixed through hole on the side of the fixed shell, the follower magnet is attached to the side of the bolt, and the follower magnet is arranged opposite to the reed switch.

[0005] Preferably, the reed switch is fixedly connected to the fixing block via a telescopic rod, the fixing block is threadedly connected to the fixing through hole, and the signal line passes through the fixing block and is connected to the controller.

[0006] Preferably, the telescopic rod comprises an internally threaded rod and an externally threaded rod, the internally threaded rod is arranged inside the externally threaded rod, and the externally threaded rod is threadedly connected to the adjustment hole of the fixing block.

[0007] Preferably, the internal threaded rod is fixedly connected to the reed switch via a fixing head, the fixing head comprises a U-shaped fixing plate and a fixing tube, the fixing tube is fixedly connected to the U-shaped fixing plate, and the U-shaped fixing plate is bonded to the reed switch.

[0008] Preferably, a threaded sleeve is sleeved on the outer side of the fixing tube, a through hole is opened in the fixing tube, a ball is arranged in the through hole, and the ball is arranged opposite to the annular groove at one end of the internal threaded rod.

[0009] Preferably, a strong magnetic ring is embedded in the bottom of the fixing shell, and a fixing pin is fixed on the side of the fixing shell.

[0010] Therefore, the present invention adopts a sensor for detecting screw loosening of the above structure, which can detect whether the bolt is loose in a contactless manner, has a simple structure, is easy to install, has a long service life and is low in cost.

[0011] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A cross-sectional view of a sensor for detecting screw loosening according to the present invention;

[0013] Figure 2 It is a schematic diagram of the structure of the detection mechanism of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of the fixed head of the present invention;

[0015] Figure 4 The present invention is a stereoscopic diagram of a sensor for detecting screw loosening.

[0016] Reference numerals

[0017] 1. Fixed shell; 2. Strong magnetic ring; 21. Fixed pin; 3. Follower magnet; 4. Reed switch; 5. Fixed block; 51. Adjustment hole; 6. Signal line; 7. Fixed head; 71. U-shaped fixed plate; 72. Fixed tube; 721. Threaded sleeve; 722. Ball; 8. Telescopic rod; 81. Internal threaded rod; 811. Ring groove; 82. External threaded rod. DETAILED DESCRIPTION

[0018] Example

[0019] Figure 1 This is a cross-sectional view of a sensor for detecting screw loosening according to the present invention. Figure 2 It is a schematic diagram of the structure of the detection mechanism of the present invention. Figure 3 This is a schematic diagram of the fixed head structure of the present invention. Figure 4The present invention is a three-dimensional diagram of a sensor for detecting screw loosening. As shown in the figure, a sensor for detecting screw loosening includes at least one fixed housing 1, and the number of fixed housings 1 is adjusted according to the actual number of bolts. A detection mechanism is arranged on the fixed housing 1, and the detection mechanism includes a fixed block 5, a reed switch 4 and a signal line 6. The signal line 6 is connected to the reed switch 4. The reed switch 4 is fixed to the inner side of the fixed block 5. The reed switch 4 is fixedly connected to the fixed block 5 through a telescopic rod 8. The fixed block 5 is threadedly connected to the fixed through hole of the fixed housing 1. The telescopic rod 8 includes an internal threaded rod 81 and an external threaded rod 82. The internal threaded rod 81 is arranged in the external threaded rod 82. The external threaded rod 82 is threadedly connected to the adjustment hole 51 of the fixed block 5, and the extension length of the reed switch 4 can be adjusted according to the actual bolt size. The internal threaded rod 81 is fixedly connected to the reed switch 4 through a fixed head 7. The fixed head 7 includes a U-shaped fixed plate 71 and a fixed tube 72. The fixed tube 72 is fixedly connected to the U-shaped fixed plate 71, and the U-shaped fixed plate 71 is bonded to the reed switch 4. A threaded sleeve 721 is sleeved on the outside of the fixed tube 72. The fixed tube 72 is provided with a through hole. A ball 722 is arranged in the through hole. The ball 722 is arranged opposite to the annular groove 811 at one end of the internal threaded rod 81, so that the direction of the reed switch 4 can be adjusted after rotating the telescopic rod 8. The follower magnet 3 is attached to the side of the bolt and arranged opposite to the reed switch 4. When the bolt is loose and rotates, the reed switch 4 sends a switch signal to the subsequent controller for alarm. According to the actual position and number of the bolts, the signal line 6 passes through the fixed block 5 and is connected to the controller. The detected switch quantity is connected in series or in parallel through the signal line 6, and the controller performs logical judgment to give an early warning. A strong magnetic ring 2 is embedded at the bottom of the fixed shell 1, and a fixing pin 21 is fixed on the side of the fixed shell 1 to ensure that the fixed shell 1 is adsorbed on the flange or the fixed shell 1 is directly welded to the flange to ensure that the fixed shell 1 does not move relative to the flange.

[0020] Therefore, the present invention adopts a sensor for detecting screw loosening of the above structure, which can detect whether the bolt is loose in a contactless manner, has a simple structure, is easy to install, has a long service life and is low in cost.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A sensor for detecting screw loosening, comprising at least one fixed housing, characterized in that: It also includes a follower magnet and a detection mechanism, the detection mechanism includes a fixed block, a reed switch and a signal line, the signal line is connected to the reed switch, the reed switch is fixed to the inner side of the fixed block, the fixed block is fixed in the fixed through hole on the side of the fixed housing, the follower magnet is attached to the side of the bolt, and the follower magnet is arranged opposite to the reed switch; The reed switch is fixedly connected to the fixing block via a telescopic rod, the fixing block is threadedly connected to the fixing through hole, and the signal line passes through the fixing block and is connected to the controller; The telescopic rod comprises an internal threaded rod and an external threaded rod, the internal threaded rod is arranged inside the external threaded rod, and the external threaded rod is threadedly connected to the adjustment hole of the fixing block; The internal threaded rod is fixedly connected to the reed switch via a fixing head, the fixing head comprises a U-shaped fixing plate and a fixing tube, the fixing tube is fixedly connected to the U-shaped fixing plate, and the U-shaped fixing plate is bonded to the reed switch; A threaded sleeve is sleeved on the outer side of the fixed tube, a through hole is opened on the fixed tube, a ball is arranged in the through hole, and the ball is arranged opposite to the annular groove at one end of the internal threaded rod; A strong magnetic ring is embedded in the bottom of the fixed shell, and a fixing pin is fixed on the side of the fixed shell.

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