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 particularly to a monitoring system for intelligent nuts of tower cranes. Background Art

[0002] A tower crane is one of the most commonly used lifting equipment on construction sites, also known as a "tower hoist", which is used to lift construction raw materials such as steel bars, wooden beams, concrete, and steel pipes. A tower crane is an essential piece of equipment on a construction site.

[0003] Currently, during the assembly of a tower crane, it is fixed by nuts and bolts. When the nut becomes loose, it may cause the tower crane to collapse and harm construction workers. Therefore, a detection and warning device is installed on the nut to avoid accidents. Most of the existing nut warning devices rely on pressure sensors to monitor whether the nut is loose. This method has the following defects:

[0004] 1. A tower crane is a heavy lifting machine. The tower is composed of multiple tower sections connected by bolts and nuts. When the nut is loose, a huge impact force may act on the pressure sensor. When the pressure sensor is overloaded, it is easy to cause damage to related electrical components and even fail to generate an alarm.

[0005] 2. The existing warning devices can only judge whether an alarm situation occurs through pressure signals, but cannot accurately judge the degree of nut loosening, so they cannot provide accurate warning information to relevant management personnel.

[0006] 3. Some warning devices are screwed onto the bolt through threads. As the nut loosens, it may drive the warning device to rotate in the same direction, causing the warning device itself to become loose relative to the bolt, and then resulting in inaccurate monitoring results. Content of the Utility Model

[0007] The present invention provides a monitoring system for intelligent nuts of tower cranes, aiming to solve the problems described in items 1-3 of the background art.

[0008] To achieve the above object, the technical solution of the present invention is:

[0009] A monitoring system for intelligent nuts of tower cranes includes a high-strength bolt, a nut, and a monitoring device. A threaded hole is coaxially provided at the top end of the high-strength bolt, and the thread direction of the threaded hole is opposite to that of the high-strength bolt. The nut is screwed onto the high-strength bolt and used to lock adjacent tower sections. A stud is provided at the center of the bottom end of the monitoring device, and 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 signal-connected to the control system of the tower crane safety management agency through a wireless signal transceiver device.

[0010] Preferably, a frustum-shaped slope structure is coaxially provided at the top of the nut and on the outer edge of the threaded inner hole.

[0011] Preferably, the monitoring device includes a solid block, and a stud is coaxially and fixedly connected to the bottom end of the solid block.

[0012] Preferably, a control cavity is provided in the middle of the top end of the solid block, and a controller and a storage battery are electrically connected to each other in the control cavity. The storage battery is used to supply power to the pressure sensor and the displacement sensor.

[0013] Preferably, a plurality of longitudinally arranged pressure bars are evenly distributed on the bottom edge of the solid block. The top end of the pressure bar 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 bar is connected to the pressure sensor. A first wedge block is fixedly provided at the bottom end of the pressure bar. The inclined surface at the bottom of the first wedge block is slidably matched with the outer surface of the frustum-shaped slope structure. The pressure sensor is electrically connected to the controller through a wire.

[0014] Preferably, a return spring is sleeved on the outer periphery of the rod body of the pressure bar between the first wedge block and the solid block. 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.

[0015] Preferably, a displacement sensor is provided between adjacent pressure bars. The top end of the displacement sensor is fixedly connected to the bottom end of the solid block, and the bottom end of the displacement sensor is slidably matched with the outer surface of the frustum-shaped slope structure through a second wedge block.

[0016] Preferably, an audible and visual alarm is further provided at the top end of the solid block. The controller is electrically connected to the audible and visual alarm through a wire.

[0017] Preferably, a wireless signal transceiver device is provided on the outer surface of the solid block.

[0018] Preferably, the pressure sensors and displacement sensors are numbered according to the single section of the tower crane and the position of the single section.

[0019] The novel tower crane intelligent nut monitoring system has the following beneficial effects:

[0020] The novel type 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 nut due to loosening 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. At the same time, the solid block is screwed into the reverse-threaded hole through the stud, which can avoid the self-loosening caused by force transmission when the nut is loose. At the same time, the solid block also plays an anti-loosening effect on the nut. Description of the Drawings

[0021] Figure 1 、Schematic diagram of the partial sectional structure during the use of the present novelty;

[0022] Figure 2 、Schematic diagram of the partial sectional structure during the use of the present novelty;

[0023] Figure 3 、Top view structure diagram of the nut of the present novelty;

[0024] Figure 4 、Top view structure diagram of the bolt of the present novelty;

[0025] 1: Connection part between adjacent single sections of the tower; 2: High-strength bolt; 3: Nut; 4: Solid block; 5: Pressing rod; 6: Sliding hole; 7: Pressure sensor; 8: Control cavity; 9: Acousto-optic alarm; 10: Reset spring; 11: Threaded hole; 12: Stud; 13: Frustum-shaped slope structure; 14: First wedge block; 15: Displacement sensor; 16: Second wedge block. Specific implementation manner

[0026] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the content disclosed below.

[0028] The following combines Figure 1 、 Figure 2 、 Figure 3 and Figure 4 to further illustrate the technical solution of the present utility model.

[0029] The first embodiment, as Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown: A smart nut monitoring system for a tower crane, which includes: a high-strength bolt 2, a nut 3, and a monitoring device. At the top of the high-strength bolt 2, a threaded hole 11 is coaxially provided. The thread direction of the threaded hole 11 is opposite to that of the high-strength bolt 2 (the opposite thread directions here should be understood as when the nut loosens, through the force transmission of the pressure rod, it will only drive the monitoring device to tighten more on the threaded hole and will not loosen, thereby ensuring the reliability of the pressure signal and displacement signal. On the other hand, designed in this way, the solid block also constitutes a locking structure for the nut). The nut 3 is screwed onto the high-strength bolt 2 and is used to lock adjacent single sections of the tower crane. At the center of the bottom end of the monitoring device, a stud 12 is provided. The stud 12 is screwed into the threaded hole 11. 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 signal-connected to the control system of the tower crane safety management agency through a wireless signal transceiver device (not shown in the figure).

[0030] In this embodiment, as Figure 1 、 2 、and Figure 3 show, a frustum-shaped slope structure 13 is coaxially provided at the top end of the nut 3 and on the outer edge of the threaded inner hole.

[0031] In this embodiment, as Figure 1 、 2 shown, the monitoring device includes a solid block 4. At the bottom end of the solid block 4, a stud 12 is coaxially and fixedly connected.

[0032] In this embodiment, as Figure 1 、 2 shown, a control cavity 8 is provided in the middle of the top end of the solid block 4. In the control cavity 8, a controller (not drawn in the figure) and a storage battery (not drawn in the figure) are electrically connected to each other. The storage battery is used to supply power to the pressure sensor and the displacement sensor 15.

[0033] In this embodiment, as Figure 1 、 2As 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 end of the pressure rod 5 is inserted into the sliding hole 6 preset at the bottom end of the solid block and is slidably connected to the sliding hole 6. The pressure sensor 7 is embedded in the top of the sliding hole 6. The top end of the pressure rod 5 is connected to the pressure sensor 7. The bottom end 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 slides with the outer surface of the truncated cone-shaped slope structure 13. The pressure sensor 7 is electrically connected to the controller via a wire. It is understandable that since the nut is loosened by rotating along the thread, the new arrangement of the inclined surface at the bottom of the first wedge block 14 slidingly cooperates with the outer surface of the truncated cone-shaped slope structure 13 can minimize the impact of the nut rotation 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 loosening of the nut will produce a lifting effect on the pressure rod, thereby causing the pressure sensor to detect a pressure signal.

[0034] In this embodiment, Figure 1 、 2 As shown, the compression rod 5 is located between the first wedge block 14 and the solid block 4, and a return spring 10 is sheathed around the rod. 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 against the pressure sensor, thereby ensuring a certain initial pressure in the pressure sensor.

[0035] In this embodiment, Figure 1 、 2 As shown, displacement sensors 15 are installed 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 slides with the outer surface of the frustum-shaped slope structure 13 via a second wedge-shaped block 16. A controller or control system can determine the degree of nut looseness (i.e., displacement along the axial direction of the bolt) based on the displacement sensor's value. Even if the pressure sensor fails, the displacement sensor can still provide an accurate alarm signal.

[0036] In this embodiment, Figure 1 、 2 As shown, the top of the solid 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.

[0037] In this embodiment, Figure 1 、 2 As shown, a wireless signal transceiver device (not shown) is provided on the outer surface of the solid block 4.

[0038] In this embodiment, Figure 1 、 2As shown, the pressure sensor 7 and the displacement sensor 15 are numbered according to the single section of the tower and the position of the single section. For example, if the pressure sensor is set at the position of the second nut counted clockwise from the top of the second tower single section from bottom to top, the number 2A2 can be set; of course, the number can also be set in other ways. The meaning of setting the number is to enable the control system to conveniently and quickly identify the position where the nut is loose.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A smart nut monitoring system for tower cranes, characterized by: It includes high-strength bolts, nuts, and monitoring devices. A threaded hole is coaxially provided at the top end of the high-strength bolt, and the thread direction of the threaded hole is opposite to that of the high-strength bolt. The nut is screwed onto the high-strength bolt and used to lock adjacent single sections of the tower. A stud is provided at the center of the bottom end of the monitoring device, and 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 signal-connected to the control system of the tower crane safety management agency through a wireless signal transceiver device.

2. The intelligent nut monitoring system for tower crane according to claim 1, characterized in that: A frustum-shaped ramp structure is coaxially provided at the top end of the nut and on the outer edge of the inner threaded hole.

3. The intelligent nut monitoring system for tower crane according to claim 2, characterized in that: The monitoring device includes a solid block, and a stud is coaxially and fixedly connected to the bottom end of the solid block.

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

5. The intelligent nut monitoring system for tower crane according to claim 4, characterized in that: A plurality of longitudinally arranged pressure rods 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. A first wedge block is fixedly provided at the bottom end of the pressure rod, and the inclined surface at the bottom of the first wedge block is in sliding fit with the outer surface of the frustum-shaped ramp structure. The pressure sensor is electrically connected to the controller through a wire.

6. The intelligent nut monitoring system for tower crane according to claim 5, characterized in that: A return spring is sleeved on the outer periphery of the rod body of the pressure rod between the first wedge block and the solid block. 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. The intelligent nut monitoring system for tower crane according to claim 6, characterized in that: 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 solid block, and the bottom end of the displacement sensor is in sliding fit with the outer surface of the frustum-shaped ramp structure through a second wedge block.

8. The intelligent nut monitoring system for tower crane according to claim 7, characterized in that: An audible and visual alarm is also provided at the top end of the solid block, and the controller is electrically connected to the audible and visual alarm through a wire.

9. The intelligent nut monitoring system for tower crane according to claim 8, characterized in that: A wireless signal transceiver device is provided on the outer surface of the solid block.

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

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