CN214667383U - Monitoring device for bolt looseness - Google Patents
Monitoring device for bolt looseness Download PDFInfo
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- CN214667383U CN214667383U CN202120709900.9U CN202120709900U CN214667383U CN 214667383 U CN214667383 U CN 214667383U CN 202120709900 U CN202120709900 U CN 202120709900U CN 214667383 U CN214667383 U CN 214667383U
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Abstract
The utility model relates to a monitoring devices that bolt is not hard up. The monitoring device for the bolt looseness is used for monitoring the pretightening force of the bolt body and comprises an isolating rod, a nut, a force-sensitive resistor and a measuring and calculating device; the isolating rod is formed by an annular groove in the middle of the bolt body and comprises a first end positioned in the bolt body and a second end extending out of the bolt body, and the nut cap is arranged at the second end and connected with the bolt body; the force sensitive resistor is arranged in the groove of the nut, and the force sensitive resistor is arranged corresponding to the second end of the isolating rod; the measuring and calculating device is electrically connected with the force sensitive resistor. The nut is added to the monitoring device for the loosening of the bolt on the bolt, whether the pre-tightening force of the bolt reaches the standard is monitored by monitoring whether the resistance value of the force-sensitive resistor changes, and the monitoring device has the advantages of being high in monitoring efficiency, convenient to operate and high in monitoring precision.
Description
Technical Field
The utility model relates to a building construction field especially relates to the monitoring devices that the bolt is not hard up.
Background
Hoisting equipment such as tower cranes, elevators and the like are commonly used in the building construction process, the equipment is generally formed by assembling modular components on site, hydraulic lifting is continuously carried out along with the requirement of the construction height, standard sections are added simultaneously, and the newly-placed standard sections and the vertically-adjacent standard sections are uniformly connected by bolts. During the installation and use of the hoisting equipment, serious accidents such as overturning, collapsing and the like are caused by loosening and breaking of bolts. It is therefore necessary to ensure, by periodic inspection, that the bolted connection must not loosen, the key being to ensure that each high-strength bolt ensures sufficient pretensioning.
The traditional conventional inspection method is to inspect the connection condition of the high-strength bolt by using a torque wrench. The group of bolts at the connecting position of each section are checked one by manual climbing, so that the efficiency is low, time and labor are consumed, and safety risks exist in detection personnel; meanwhile, the measurement accuracy of the actual pre-tightening force of the conventional torque wrench on the bolt has a large error, which is generally close to +/-30%. Some other methods related to bolt pretightening force detection control measure the pretightening force of the bolt by attaching a strain gauge, and the strain gauge is complicated to use, poor in field operability and incapable of realizing monitoring of a large number of bolts; some ultrasonic waves are adopted to measure the actual stress state of the bolt, the workload is also huge by monitoring one by one, and the measurement precision is greatly influenced by an operator;
as a novel bolt form gradually developed in recent years, the intelligent bolt has the sensing capability on environmental factors such as temperature, load, pressure and the like through methods such as a built-in sensor, a memory/microprocessor chip and the like. The current intelligent bolt lacks an automatic monitoring function, can be observed only by a worker in a close-range visual mode, and is expensive.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a bolt looseness monitoring device which is efficient, convenient to monitor, easy to operate and high in precision, and aims to solve the problems of low efficiency, time and labor consumption, low precision and poor operability of the bolt looseness monitoring method.
A monitoring device for bolt looseness is used for monitoring pretightening force of a bolt body, and the monitoring device for bolt looseness comprises:
the isolating rod is formed by an annular groove in the middle of the bolt body and comprises a first end positioned in the bolt body and a second end extending out of the bolt body,
the nut is covered on the second end and is connected with the bolt body;
the force-sensitive resistor is arranged in the groove of the nut, and the force-sensitive resistor is arranged corresponding to the second end of the isolating rod;
and the measuring and calculating device is electrically connected with the force sensitive resistor.
In one embodiment, further comprising: and the early warning device is connected with the measuring and calculating device.
In one embodiment, the number of the bolts is multiple, and the monitoring device for bolt loosening further comprises a concentrator, wherein the concentrator is electrically connected with the meter and the force sensitive resistors of the plurality of bolts.
In one embodiment, the battery box is further included, and the battery box is connected with the measuring instrument and the early warning instrument.
In one embodiment, a fixing piece is arranged at one end of the nut close to the bolt body, and when the nut is connected with the bolt body, the fixing piece is located in the bolt body.
In one embodiment, the fixing plate is provided with an external thread, and an internal thread is provided in the bolt body at a position corresponding to the fixing plate.
In one embodiment, the nut is provided with a through hole, two ends of the force sensitive resistor are connected with the measuring and calculating device through conducting wires, and the conducting wires penetrate through the through hole.
In one embodiment, the force sensitive resistor is adhesively attached to the nut.
In one embodiment, the centerline of the spacer rod is collinear with the centerline of the bolt body.
When the monitoring device for the bolt looseness is used, the bolt body longitudinally deforms in the process of pre-tightening and tensioning the bolt, at the moment, the second end of the isolating rod deforms along with the bolt body and is separated from the force-sensitive resistor in the nut, namely, the second end of the isolating rod is in a free state, and the resistance of the force-sensitive resistor acquired by the measuring and calculating device is the first resistance value. When the pretightening force of the bolt is loosened, namely, the bolt is loosened, the longitudinal deformation of the bolt body is gradually reduced until the original length is completely recovered. At the moment, the isolating rod is in contact fit with the force-sensitive resistor, and the resistance value of the force-sensitive resistor acquired by the measurer is a second resistance value. The nut is added to the monitoring device for the loosening of the bolt on the bolt, whether the pre-tightening force of the bolt reaches the standard is monitored by monitoring whether the resistance value of the force-sensitive resistor changes, and the monitoring device has the advantages of being high in monitoring efficiency, convenient to operate and high in monitoring precision.
Drawings
FIG. 1 is a schematic view of a part of a bolt loosening monitoring device according to an embodiment;
FIG. 2 is a schematic structural view of a bolt body of the monitoring device for bolt loosening shown in FIG. 1;
FIG. 3 is a schematic structural view of a nut of the bolt looseness monitoring device shown in FIG. 1;
fig. 4 is another partial structural schematic diagram of a bolt loosening monitoring device according to an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model discloses a monitoring devices that bolt is not hard up is used for solving construction machinery equipment like the control difficult problem of the bolted connection performance of equipment such as tower crane, lift in the installation use. By monitoring the core index of the pretightening force of the bolt, the automatic and rapid monitoring of the working state of the bolt is realized, and a reliable basis is provided for the real-time assessment of the safety risk of the hoisting machinery on the construction site. The following will explain in detail the monitoring device for bolt looseness of the present invention with reference to the attached drawings.
As shown in fig. 1-4, an embodiment of a bolt looseness monitoring device for monitoring a pretightening force of a bolt body 10 includes a spacer 20, a nut 30, a force-sensitive resistor 40, and a meter 50; the isolating rod 20 is formed by an annular groove in the middle of the bolt body 10, the isolating rod 20 comprises a first end positioned in the bolt body 10 and a second end extending out of the bolt body 10, and the nut 30 is covered on the second end and connected with the bolt body 10; the force sensitive resistor 40 is arranged in the groove of the nut 30, and the force sensitive resistor 40 is arranged corresponding to the second end of the isolating rod 20; the meter 50 is electrically connected to the force sensitive resistor 40.
When the monitoring device for bolt looseness is used, the bolt body 10 generates longitudinal deformation in the process that the bolt body 10 is pre-tightened and pulled, at the moment, the second end of the isolating rod 20 deforms along with the bolt body 10 and is separated from the force-sensitive resistor 40 in the nut 30, namely, the second end of the isolating rod 20 is in a free state, and at the moment, the resistance of the force-sensitive resistor 40 acquired by the measuring and calculating device 50 is a first resistance value. When the pretightening force of the bolt body 10 is loosened, namely, the bolt body 10 is loosened, the longitudinal deformation of the bolt body 10 is gradually reduced until the original length is completely recovered. At this time, the isolation rod 20 contacts and adheres to the force sensitive resistor 40, and the resistance value of the force sensitive resistor 40 acquired by the meter 50 is the second resistance value. Above-mentioned monitoring devices that bolt is not hard up adds nut 30 on bolt body 10, whether changes the pretightning force of coming bolt body 10 through monitoring force sensitive resistor 40 resistance and monitors up to standard, has the advantage that monitoring efficiency is high, convenient operation and monitoring precision are high.
As shown in fig. 2, the isolating rod 20 is formed by processing an annular undercut in the middle of the bolt body 10, the cross-sectional shape of the isolating rod is circular, and the center line of the isolating rod 20 and the center line of the bolt body 10 are on the same straight line, so that the monitoring accuracy of the pretightening force of the bolt body 10 can be improved. The annular undercut of the bolt body 10 forms the isolation plate 20, so that a gap is left between the isolation rod 20 and the bolt body 10, and the nut 30 is conveniently fixed. In addition, the isolating rod 20 is directly formed in the mode of slotting in the bolt body 10, the isolating rod 20 is directly connected with the bolt body 10, the connection stability is good, and the monitoring precision is favorably improved. The size of the spacer 20 may be selected according to actual conditions, and is not limited herein.
When the spacer 20 is formed, it includes a first end located inside the bolt body 10 and a second end protruding out of the bolt body 10, i.e., the second end of the spacer 20 is higher than the surface of the bolt body 10 so as to match the groove of the nut 30. After the bolt body 10 is annularly undercut to form the separator bar 20, a portion of the bolt body 10 may be cut to partially expose the separator bar 20. The length of the spacer 20 extending out of the bolt body 10 can be selected according to practical situations, and is not limited herein.
Referring to fig. 1-3, a nut 30 is disposed on the second end and connected to the bolt body 10. Specifically, the nut 30 is provided with a groove, the size of the groove is matched with that of the isolating rod 20, the bottom of the groove is provided with the force-sensitive resistor 40, and when the nut 30 is assembled with the bolt body 10, the second end of the isolating rod 20, namely, the top end of the isolating rod 20 is just attached to the force-sensitive resistor 40 in the nut 30. Considering the deformation magnitude of the bolt and the sensitivity requirement of the conventional force-sensitive resistor, the processing precision needs to be controlled within 0.1 millimeter.
In the present embodiment, one end of the nut 30 close to the bolt body 10 is provided with a fixing piece 52, and when the nut 30 is connected to the bolt body 10, the fixing piece 52 is located in the bolt body 10. Furthermore, in the present embodiment, an external thread is formed on the outer surface of the fixing piece 52, an internal thread is formed in the bolt body 10 at a position corresponding to the fixing piece 52, and the external thread of the fixing piece 52 matches the internal thread in the bolt body 10, so that the threaded connection between the nut 30 and the bolt body 10 is realized, and the convenience of operation is improved.
As shown in FIG. 3, the force-sensitive resistor 40 is connected to the meter 50 through a wire 42, and a through hole may be formed in the nut 30 to facilitate the penetration of the wire 42. The force sensitive resistor 40 is connected at both ends to the meter 50 by wires 42, thereby forming a loop. The measurer 50 is used for monitoring the change of the resistance of the force sensitive resistor 40 and judging whether the pretightening force of the bolt body 10 changes or not according to the change of the resistance. The meter 50 may be a resistance meter, a current meter, a voltage meter, or the like, and is not limited herein.
In this embodiment, the bolt loosening monitoring device further comprises an early warning device 60 connected to the meter 50. The measurer 50 is used for measuring the resistance of the current force-sensitive resistor 40 and judging whether the current force-sensitive resistor is abnormal, and the early warning device 60 is used for giving out warning such as sound, light and smoke to the overrun so as to prompt constructors. Furthermore, a wireless module can be arranged in the early warning device 60, and when an alarm occurs, the alarm information can be directly transmitted to the ground through the wireless module to remind a worker to check and process the corresponding bolt in time. The wireless module can be a wifi module, a bluetooth module, etc.
In a general construction process, the number of the bolt bodies 10 may be plural. As shown in fig. 4, in the present embodiment, the bolt loosening monitoring device further includes a hub 70, and the hub 70 is connected to the meter 50 and the force sensitive resistors 40 of the plurality of bolts. Each bolt body 10 can be connected to a bolt looseness monitoring device through the hub 70. In addition, in this embodiment, the monitoring device for bolt loosening further includes a battery compartment 80, and the battery compartment 80 is connected to the meter 50 and the early warning device 60. The battery compartment 80 provides power supply, can be configured with solar charging function, ensures the cruising ability of the monitoring device under the condition of long construction period, avoids the complex work brought by battery replacement, and improves the convenience of operation.
The following describes an operation method of the bolt loosening monitoring device.
Considering that the hoisting equipment such as tower cranes, elevators and the like are all in a sectional type assembling structure, before assembling, the measuring and calculating device 50, the early warning device 60 and the battery bin 80 can be installed on each group of sections at the ground stage, and the connection between the force-sensitive resistor 40 in the screw cap 30 and the concentrator 70 is completed. In the formal installation process, on the basis of normal segment assembling installation, a nut 30 is added to each bolt body 10, and then the assembly can be completed.
The longitudinal deformation occurs during the pre-tightening of the bolt body 10, and the second end of the isolating rod 20 will be disengaged from the force-sensitive resistor 40 in the nut 30 along with the longitudinal deformation of the bolt body 10, i.e. the second end of the isolating rod 20 is in a free state. At this time, the resistance of the force sensitive resistor 40 measured by the meter 50 is the first resistance.
Once the pretightening force of the bolt body 10 is loosened, the bolt is loosened, that is, the longitudinal deformation of the bolt body 10 is gradually reduced until the bolt is completely loosened, the bolt returns to the original length, at this time, the second end of the isolating rod 20 is in contact with the force-sensitive resistor 40, and at this time, the resistance value of the force-sensitive resistor 40 measured by the measurer 50 is the second resistance value. Whether the pretightening force of the bolt changes can be monitored through the change of the resistance value, and whether the bolt loosens is further judged.
By the bolt looseness monitoring device, whether the bolt pretightening force reaches the standard can be directly and effectively monitored; compared with the existing method for measuring the gasket pressure and the gasket torque, the method for judging the working state of the bolt according to the pretightening force is more scientific and effective. Based on the sectional type assembling characteristics of construction hoisting equipment such as a tower crane and a lifter, the early warning device 60, the measuring and calculating device 50, the battery bin 80 and the concentrator 70 are additionally arranged on each section respectively, so that the problem that a large number of bolts are difficult to monitor and control wires is avoided; meanwhile, the bolts are installed in a segmented mode, and early warning is conducted in a segmented mode, so that technicians can find the positions of the bolts where the bolts are loosened in time, and the bolts are convenient to overhaul in time. Greatly reducing the operation safety risk of construction hoisting equipment such as tower cranes, elevators and the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. The utility model provides a monitoring devices that bolt is not hard up for monitoring bolt body's pretightning force, its characterized in that includes:
the isolating rod is formed by an annular groove in the middle of the bolt body and comprises a first end positioned in the bolt body and a second end extending out of the bolt body,
the nut is covered on the second end and is connected with the bolt body;
the force-sensitive resistor is arranged in the groove of the nut, and the force-sensitive resistor is arranged corresponding to the second end of the isolating rod;
and the measuring and calculating device is electrically connected with the force sensitive resistor.
2. The bolt looseness monitoring device according to claim 1, further comprising:
and the early warning device is connected with the measuring and calculating device.
3. The device for monitoring bolt loosening as claimed in claim 2, wherein the number of the bolts is plural, and the device for monitoring bolt loosening further comprises a hub electrically connected to the meter and the force sensitive resistors of plural bolts.
4. The device for monitoring bolt loosening of claim 2, further comprising a battery compartment, wherein the battery compartment is connected to the meter and the early warning device.
5. A bolt looseness monitoring device according to claim 1, wherein a fixing piece is provided at an end of said nut close to said bolt body, said fixing piece being located in said bolt body when said nut is coupled to said bolt body.
6. A bolt looseness monitoring device according to claim 5, wherein said fixing piece is provided with an external thread, and a position corresponding to said fixing piece in said bolt body is provided with an internal thread.
7. The bolt looseness monitoring device according to claim 1, wherein a through hole is formed in the nut, two ends of the force sensitive resistor are connected with the measuring and calculating device through a lead, and the lead penetrates through the through hole.
8. A bolt loosening monitoring device as claimed in claim 1, wherein the force sensitive resistor is adhesively attached to the nut.
9. A bolt loosening monitoring device as claimed in any one of claims 1 to 8, wherein the centre line of the spacer rod is collinear with the centre line of the bolt body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120709900.9U CN214667383U (en) | 2021-04-08 | 2021-04-08 | Monitoring device for bolt looseness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120709900.9U CN214667383U (en) | 2021-04-08 | 2021-04-08 | Monitoring device for bolt looseness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214667383U true CN214667383U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120709900.9U Active CN214667383U (en) | 2021-04-08 | 2021-04-08 | Monitoring device for bolt looseness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214667383U (en) |
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2021
- 2021-04-08 CN CN202120709900.9U patent/CN214667383U/en active Active
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