Intelligent nut monitoring system for tower crane

Abstract

A tower crane intelligent nut monitoring system relates to the technical field of tower crane intelligent monitoring and comprises a high-strength bolt, a nut and a monitoring device, a threaded hole is coaxially formed in the top end of the high-strength bolt, and the thread screwing direction of the threaded hole is opposite to that of the high-strength bolt; the nuts are screwed on the high-strength bolts and used for locking the adjacent tower single sections, the center of the bottom end of the monitoring device is provided with a stud, the stud is in threaded connection with the threaded hole, and the monitoring device is connected with the tops of the nuts through a displacement sensor and a pressure sensor. And the wireless signal receiving and transmitting device is in signal connection with a control system of a tower crane safety management mechanism. The safety monitoring effect of the intelligent nut of the tower crane can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent monitoring of tower cranes, and in particular to an intelligent nut monitoring system for tower cranes. Background Art

[0002] Tower crane is the most commonly used lifting equipment on construction sites, also known as "tower crane", which is used to lift construction materials such as steel bars, wooden planks, concrete, steel pipes, etc. Tower crane is an indispensable equipment on construction sites.

[0003] At present, the tower crane is fixed by nuts and bolts during assembly. When the nuts become loose, the tower crane will collapse and cause harm to the construction workers. Therefore, a detection and warning device is installed on the nuts to avoid accidents. Most of the existing nut warning devices rely on pressure sensors to monitor whether the nuts are loose. This method has the following defects: 1. Tower crane is a heavy lifting machine. The tower is composed of multiple tower sections connected by bolts and nuts. When the nuts are loose, there may be a huge impact force acting on the pressure sensor. When the pressure sensor is overloaded, it is easy to cause damage to related electrical components, or even fail to generate an alarm.

[0004] 2. The existing early warning device can only determine whether an alarm occurs through pressure signals, but cannot accurately determine the degree of nut loosening, so it cannot provide accurate warning information to relevant management personnel.

[0005] 3. Some early warning devices are screwed to bolts through threads. As the nuts loosen, the early warning devices may rotate in the same direction, causing the early warning devices themselves to loosen relative to the bolts, thereby causing inaccurate monitoring results. Summary of the invention

[0006] The present invention provides a tower crane intelligent nut monitoring system, the purpose of which is to solve the problems described in the background technology parts 1-3.

[0007] To achieve the above object, the technical solution of the present invention is: A tower crane intelligent nut monitoring system comprises a high-strength bolt, a nut and a monitoring device. A threaded hole is coaxially arranged at the top of the high-strength bolt. The thread rotation direction of the threaded hole is opposite to that of the high-strength bolt. The nut is tightened on the high-strength bolt and used to lock adjacent tower sections. A stud is arranged at the center of the bottom end of the monitoring device. The stud is screwed into the threaded hole. The monitoring device is connected to the top of the nut through a displacement sensor and a pressure sensor, and is connected to the control system signal of the tower crane safety management organization through a wireless signal transceiver.

[0008] Preferably, a truncated cone-shaped slope structure is coaxially provided at the top of the nut and at the outer edge of the threaded inner hole.

[0009] Preferably, the monitoring device comprises a solid block, and a stud is coaxially fixedly connected to the bottom end of the solid block.

[0010] Preferably, a control cavity is provided in the middle of the top of the solid block, and a controller and a battery electrically connected to each other are provided in the control cavity, and the battery is used to supply power to the pressure sensor and the displacement sensor.

[0011] Preferably, a plurality of pressure rods arranged longitudinally are evenly distributed on the bottom edge of the solid block, the top end of the pressure rod is inserted into a sliding hole preset at the bottom end of the solid block, and is slidably connected to the sliding hole, the pressure sensor is embedded in the top of the sliding hole, the top end of the pressure rod is connected to the pressure sensor, and a first wedge block is fixedly provided at the bottom end of the pressure rod, the inclined surface at the bottom of the first wedge block is slidably matched with the outer surface of the truncated cone slope structure, and the pressure sensor is electrically connected to the controller through a wire.

[0012] Preferably, the pressure rod is located between the first wedge block and the solid block and a return spring is sleeved on the outer periphery of the rod body, the top end of the return spring abuts against the bottom end of the solid block, and the bottom end of the return spring abuts against the top end of the first wedge block.

[0013] Preferably, a displacement sensor is provided between adjacent pressure rods, the top end of the displacement sensor is fixedly connected to the bottom end of the entity block, and the bottom end of the displacement sensor is slidably matched with the outer surface of the truncated cone-shaped slope structure through the second wedge block.

[0014] Preferably, a sound and light alarm is also provided on the top of the entity block, and the controller is electrically connected to the sound and light alarm via a wire.

[0015] Preferably, a wireless signal transceiver is provided on the outer surface of the solid block.

[0016] Preferably, the pressure sensor and displacement sensor are numbered according to the tower section in which they are located and the position of the section.

[0017] The tower crane intelligent nut monitoring system of the present invention has the following beneficial effects: The present invention can effectively improve the monitoring effect of the intelligent nut monitoring system. It can not only monitor the nut loosening signal through the pressure sensor, but also monitor the displacement signal generated by the loosening of the nut through the displacement sensor. When the electrical components of the pressure sensor are damaged due to a large impact force, the displacement sensor can still provide an accurate warning signal. The solid block is screwed into the reverse threaded hole through a stud, which can avoid the nut from loosening due to the force transmission when the nut is loose. At the same time, the solid block also has an anti-loosening effect on the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1, a schematic diagram of a partial cross-sectional structure of the present invention when in use; Figure 2 , a schematic diagram of a partial cross-sectional structure of the present invention when in use; Figure 3 , a schematic diagram of the top view of the nut of the present invention; Figure 4 , a schematic diagram of the top view of the bolt of the present invention; 1: the connection between adjacent tower sections, 2: high-strength bolts, 3: nuts, 4: solid blocks; 5: pressure rods, 6: sliding holes, 7: pressure sensors, 8: control chambers, 9: sound and light alarms, 10: reset springs, 11: threaded holes, 12: studs, 13: truncated cone-shaped slope structures, 14: first wedge-shaped blocks, 15: displacement sensors, 16: second wedge-shaped blocks. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the contents disclosed below.

[0021] The following combination Figure 1 , Figure 2 , Figure 3 and Figure 4 The technical solution of the present invention is further described.

[0022] The first embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown: a tower crane intelligent nut monitoring system, which includes: a high-strength bolt 2, a nut 3, and a monitoring device. The top of the high-strength bolt 2 is coaxially provided with a threaded hole 11, and the thread rotation direction of the threaded hole 11 is opposite to the thread rotation direction of the high-strength bolt 2 (the rotation direction here should be understood as when the nut is loose, the force transmitted through the pressure rod will only drive the monitoring device to be tightened on the threaded hole instead of loosening, thereby ensuring the reliability of the pressure signal and the displacement signal. On the other hand, with such a design, the solid block also constitutes a nut anti-loosening structure), the nut 3 is tightened on the high-strength bolt 2 and used to lock the adjacent tower section, a stud 12 is provided at the center of the bottom end of the monitoring device, and the stud 12 is screwed to the threaded hole 11, and the monitoring device is connected to the top of the nut 3 through a displacement sensor 15 (preferably a resistive displacement sensor) and a pressure sensor, and is connected to the control system signal of the tower crane safety management agency through a wireless signal transceiver (not shown in the figure).

[0023] In this embodiment, Figure 1 , 2 As shown in 3, a truncated cone-shaped slope structure 13 is coaxially provided at the top of the nut 3 and at the outer edge of the threaded inner hole.

[0024] In this embodiment, Figure 1 , 2 As shown, the monitoring device comprises a solid block 4, and a stud 12 is coaxially fixedly connected to the bottom end of the solid block 4.

[0025] In this embodiment, Figure 1 , 2 As shown, a control chamber 8 is provided in the middle of the top of the solid block 4, and a controller (not shown in the figure) and a battery (not shown in the figure) which are electrically connected to each other are provided in the control chamber 8. The battery is used to power the pressure sensor and the displacement sensor 15.

[0026] In this embodiment, Figure 1 , 2 As shown, the bottom edge of the solid block 4 is evenly distributed with a plurality of pressure rods 5 arranged in the longitudinal direction, the top of the pressure rod 5 is inserted into the sliding hole 6 preset at the bottom of the solid block, and is slidably connected with the sliding hole 6, the pressure sensor 7 is embedded in the top of the sliding hole 6, the top of the pressure rod 5 is connected with the pressure sensor 7, the bottom of the pressure rod 5 is fixed with a first wedge block 14, the inclined surface at the bottom of the first wedge block 14 is slidably matched with the outer surface of the truncated cone-shaped slope structure 13, and the pressure sensor 7 is electrically connected with the controller through a wire. It can be understood that since the nut is loosened by rotating along the thread, the present invention sets the inclined surface at the bottom of the first wedge block 14 to slide with the outer surface of the truncated cone-shaped slope structure 13 to minimize the collateral effect of the rotation of the nut on the solid block and avoid the solid block from moving with it. At the same time, due to the limiting effect of the sliding hole on the pressure rod, the nut will have a lifting effect on the pressure rod when it is loosened, so that the pressure sensor detects a pressure signal.

[0027] In this embodiment, Figure 1 , 2 As shown, the pressure rod 5 is located between the first wedge block 14 and the solid block 4, and a return spring 10 is sleeved on the outer periphery of the rod body. The top end of the return spring 10 abuts against the bottom end of the solid block 4, and the bottom end of the return spring 10 abuts against the top end of the first wedge block 14. The return spring tightens the pull rod on the pressure sensor, so that the pressure sensor has a certain initial pressure.

[0028] In this embodiment, Figure 1 , 2As shown, a displacement sensor 15 is provided between adjacent pressure rods 5, the top end of the displacement sensor 15 is fixedly connected to the bottom end of the solid block 4, and the bottom end of the displacement sensor 15 is slidably matched with the outer surface of the truncated cone-shaped slope structure 13 through the second wedge block 16. The controller or control system can judge the looseness of the nut (i.e., the displacement along the axial direction of the bolt) according to the value of the displacement sensor. When the pressure sensor fails, the displacement sensor can still provide an accurate alarm signal.

[0029] In this embodiment, Figure 1 , 2 As shown, the top of the entity block 4 is also provided with an audible and visual alarm 9, and the controller is electrically connected to the audible and visual alarm through a wire. The audible and visual alarm 9 allows the staff to visually see the loosening of the nut and take relevant emergency measures.

[0030] In this embodiment, Figure 1 , 2 As shown, a wireless signal transceiver (not shown) is disposed on the outer surface of the solid block 4.

[0031] In this embodiment, Figure 1 , 2 As shown, the pressure sensor 7 and displacement sensor 15 are numbered according to the tower section and the position of the section. For example, if the pressure sensor is located at the second nut at the top of the second tower section from bottom to top, the number can be set as 2A2; of course, the numbering can also be set in other ways. The purpose of setting the numbering is to enable the control system to quickly and easily identify the position of the loose nut.

[0032] The above description is only the preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tower crane intelligent nut monitoring system, characterized by: It includes a high-strength bolt, a nut, and a monitoring device. A threaded hole is coaxially arranged at the top of the high-strength bolt. The thread rotation direction of the threaded hole is opposite to that of the high-strength bolt. The nut is tightened on the high-strength bolt and is used to lock the adjacent tower sections. A stud is arranged at the center of the bottom end of the monitoring device. The stud is screwed into the threaded hole. The monitoring device is connected to the top of the nut through a displacement sensor and a pressure sensor, and is connected to the control system signal of the tower crane safety management organization through a wireless signal transceiver.

2. A tower crane intelligent nut monitoring system as claimed in claim 1, characterized in that: A truncated cone-shaped slope structure is coaxially arranged on the top of the nut and the outer edge of the threaded inner hole.

3. A tower crane intelligent nut monitoring system as claimed in claim 2, characterized in that: The monitoring device comprises a solid block, the bottom end of which is coaxially fixedly connected with a stud.

4. A tower crane intelligent nut monitoring system as claimed in claim 3, characterized in that: A control cavity is provided in the middle of the top of the solid block. A controller and a battery electrically connected to each other are provided in the control cavity. The battery is used to supply power to the pressure sensor and the displacement sensor.

5. A tower crane intelligent nut monitoring system as claimed in claim 4, characterized in that: The bottom edge of the solid block is evenly distributed with a plurality of pressure rods arranged in the longitudinal direction. The top end of the pressure rod is inserted into a sliding hole preset at the bottom end of the solid block and is slidably connected to the sliding hole. The pressure sensor is embedded in the top of the sliding hole. The top end of the pressure rod is connected to the pressure sensor. A first wedge block is fixedly provided at the bottom end of the pressure rod. The inclined surface at the bottom of the first wedge block is slidably matched with the outer surface of the truncated cone slope structure. The pressure sensor is electrically connected to the controller through a wire.

6. A tower crane intelligent nut monitoring system as claimed in claim 5, characterized in that: The pressure rod is located between the first wedge block and the solid block, and a return spring is sleeved on the outer periphery of the rod body. The top end of the return spring abuts against the bottom end of the solid block, and the bottom end of the return spring abuts against the top end of the first wedge block.

7. A tower crane intelligent nut monitoring system as claimed in claim 6, characterized in that: A displacement sensor is arranged between adjacent compression rods, the top end of the displacement sensor is fixedly connected to the bottom end of the entity block, and the bottom end of the displacement sensor is slidably matched with the outer surface of the truncated cone-shaped slope structure through a second wedge block.

8. A tower crane intelligent nut monitoring system as claimed in claim 7, characterized in that: The top of the entity block is also provided with an audible and visual alarm, and the controller is electrically connected to the audible and visual alarm through a wire.

9. A tower crane intelligent nut monitoring system as claimed in claim 8, characterized in that: The outer surface of the entity block is provided with a wireless signal receiving and sending device.

10. A tower crane intelligent nut monitoring system as claimed in claim 9, characterized in that: The pressure sensor and displacement sensor are numbered according to the tower section where they are located and the position of the section.

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