CN110793426B - Scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals - Google Patents
Scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals Download PDFInfo
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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Abstract
A scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals comprises a combined force transmission column, a force transmission rod, piezoelectric crystals, a mounting plate, a cylindrical top protection sleeve and a buckling-restrained safety early warning device, wherein the force transmission rod is connected with the combined force transmission column; the piezoelectric crystal is connected with a power amplifier arranged on the mounting plate through a lead, the output end of the power amplifier is connected with a filter arranged on the mounting plate, the output end of the filter is connected with a microcomputer processor arranged on the mounting plate, and the microcomputer processor transmits the electric signal to an acousto-optic alarm. The scaffold steel pipe yield early warning system can monitor the deformation condition of the scaffold steel pipe and provide the scaffold steel pipe yield early warning by utilizing the principles of the scaffold steel pipe yield deformation and the piezoelectric effect, and has simple structure and high reliability; the invention can be directly installed on the scaffold steel pipe, is convenient to disassemble, greatly reduces the probability of safety accidents and ensures the life safety of constructors.
Description
Technical Field
The invention belongs to the field of scaffold engineering, and particularly relates to a scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals, which is applied to scaffold steel pipe yield safety early warning in the use process of a scaffold.
Background
The construction safety is the heaviest in the construction production, and with the appearance of more and more high-rise buildings, the usage amount of scaffolds is larger and larger, and the safety problem is more and more prominent.
One of the reasons for the collapse of the scaffold is that the collapse of the scaffold is caused by the instability of the pressure straight rod of the scaffold due to insufficient strength, excessive load and the like. When the upper load of the support system is too large to exceed the critical stress of the rod piece, the support rod piece is easy to be unstably bent, the balance of a linear state begins to lose stability, the phenomenon of instability of the pressure rod is generated, after the rod piece is unstably bent, the bending deformation of the rod piece is obviously increased due to the small increase of the pressure, and the bearing capacity of the rod piece is lost. Such failure due to instability can result in damage to the entire support architecture, causing significant loss of life and property to people. Therefore, safety early warning and monitoring are required to be carried out on the scaffold construction process.
When the piezoelectric crystal is squeezed or stretched, a piezoelectric effect is generated, charges with equal size and opposite signs are generated on the surface of the piezoelectric crystal, and when the external force is removed, the piezoelectric crystal is restored to an uncharged state. The piezoelectric crystal has wide application range and obvious effect, is a good pressure sensor material, and can make sensitive response to the deformation of the scaffold steel pipe.
In the prior art, the installation and disassembly processes of the scaffold safety early warning device are complex, the turnover service capacity is insufficient, and false warning is easily caused by vibration, impact load and the like generated in activities such as building construction installation.
At present, the scaffold safety early warning device in China mainly comprises a scaffold safety early warning system such as an authorized publication number CN106840265A, and a scaffold settlement observation and settlement measurement safety early warning system such as an authorized publication number CN106705933A, and the like, wherein the invention mainly utilizes lasers, infrared sensors and the like to monitor stress deformation and basic settlement conditions of a scaffold, the installation and debugging process is complex, the influence of dust and temperature environmental conditions is large, the use conditions are limited, the scaffold steel tube deformation is directly monitored by convenient installation and disassembly in China at present, and the research and development of devices with strong anti-interference capability are not many, so that the scaffold engineering buckling-prevention safety early warning device adopting piezoelectric crystals is necessary.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the scaffold engineering buckling-restrained safety early warning device adopting the piezoelectric crystal, which is simple in structure and high in reliability, can be directly installed on a scaffold steel pipe, and carries out safety early warning on scaffold yield in the use process of the scaffold.
The technical scheme adopted by the invention for solving the technical problems is as follows: a scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals comprises a dowel bar 1, a combined dowel column 2, piezoelectric crystals 3, an insulating base 4, a mounting plate 5, a cylindrical top protective sleeve 6, a power amplifier 9, a filter 10, a microcomputer processor 11 and an acousto-optic alarm 12; the combined dowel post 2 is connected with the dowel rod 1, the piezoelectric crystals 3 are installed at two ends of the combined dowel post 2, the installation plate 5 is installed between the two insulation bases 4, and the cylindrical top protection sleeve 6 is installed outside the device; the piezoelectric crystal 3 is connected with a power amplifier 9 arranged on the mounting plate 5 through a lead 8, the output end of the power amplifier 9 is connected with a filter 10 arranged on the mounting plate 5, the output end of the filter 10 is connected with a microcomputer processor 11 arranged on the mounting plate 5, and the microcomputer processor 11 transmits an electric signal to an acousto-optic alarm 12.
The invention also has the following additional technical features:
the technical scheme of the invention is further specifically optimized as follows: the dowel bar 1 comprises a Z-shaped upper dowel bar 1a and a crank-shaped lower dowel bar 1 b; the lower end of a Z-shaped upper force transmission rod 1a is welded with a combined force transmission column 2 through a through hole 15 arranged in the middle of the side face of a cylindrical top protective sleeve 6, a sealing rubber sleeve 7 is bonded on the Z-shaped upper force transmission rod 1a and the cylindrical top protective sleeve 6 to seal the through hole 15, the upper end of the Z-shaped upper force transmission rod 1a is connected with a first scaffold connecting piece 14a through a first bidirectional connecting mantle fiber 13a, and the first scaffold connecting piece 14a is welded on a scaffold steel pipe 19; the upper end of the crank-shaped lower dowel bar 1b is welded at the left position of the top cover at the lower part of the cylindrical top-protecting sleeve 6, the lower end of the crank-shaped lower dowel bar 1b is connected with a second scaffold connecting piece 14b through a second bidirectional connecting mantle fiber 13b, and the second scaffold connecting piece 14b is welded on a scaffold steel pipe 19; the second scaffold connecting member 14b is semicircular; the Z-shaped upper force transmission rod 1a, the crutch-shaped lower force transmission rod 1b, the first scaffold connecting piece 14a and the second scaffold connecting piece 14b are all made of stainless steel.
The technical scheme of the invention is further specifically optimized as follows: the combined force transmission column 2 comprises a force transmission column 2a, an upper force transmission striker 2b and a lower force transmission striker 2 c; the lower end of a Z-shaped upper force transmission rod 1a is welded with the middle of a force transmission column 2a through hole 15 arranged in the middle of the side face of a cylindrical top protection sleeve 6, an upper force transmission striker 2b is welded in the middle of the upper end of the force transmission column 2a, a lower force transmission striker 2c is welded in the middle of the lower end of the force transmission column 2a, the upper force transmission striker 2b abuts against an upper piezoelectric crystal 3a, and the lower force transmission striker 2c abuts against a lower piezoelectric crystal 3 b; the force transmission column 2a is a cylinder and is made of stainless steel; the upper force transmission striker 2b and the lower force transmission striker 2c are in the shape of a long needle with a spherical top and are made of stainless steel.
The technical scheme of the invention is further specifically optimized as follows: the piezoelectric crystal 3 comprises an upper piezoelectric crystal 3a and a lower piezoelectric crystal 3 b; the surfaces of the upper piezoelectric crystal 3a and the lower piezoelectric crystal 3b are silver-plated electrodes; a first insulating coating 16a is coated on the inner side of the upper piezoelectric crystal 3a and is isolated from the upper force transmission striker 2b, and a second insulating coating 16b is coated on the inner side of the lower piezoelectric crystal 3b and is isolated from the lower force transmission striker 2 c; the upper piezoelectric crystal 3a is pasted on the upper insulating base 4a, and the lower piezoelectric crystal 3b is pasted on the lower insulating base 4 b; the upper piezoelectric crystal 3a and the lower piezoelectric crystal 3b are square, and are made of quartz wafer or piezoelectric ceramics.
The technical scheme of the invention is further specifically optimized as follows: the insulating base 4 includes an upper insulating base 4a and a lower insulating base 4 b; the upper insulating base 4a is installed on an upper top cover of the cylindrical top protective sleeve 6 through four first pre-tightening screws 17a, and the lower insulating base 4b is installed on a lower top cover of the cylindrical top protective sleeve 6 through four second pre-tightening screws 17 b; the upper insulating base 4a and the lower insulating base 4b are both 3/4 circular arc grooved columns, and the diameter of the notch is larger than that of the force transmission column 2 a; the upper insulation base 4a is provided with a first lead through hole 20a on the side of the notch, and the lower insulation base 4b is provided with a second lead through hole 20b on the side of the notch.
The technical scheme of the invention is further specifically optimized as follows: the mounting plate 5 is a rectangular insulating long plate, and the side surface of the long side of the mounting plate is arc-shaped; the mounting plate 5 is matched with the cylindrical top protective sleeve 6; the upper end of the mounting plate 5 is stuck on the upper insulating base 4a by a high-strength adhesive and is level with the gap of the upper insulating base 4 a; the lower end of the mounting plate 5 is adhered to the lower insulating base 4b by a high-strength adhesive and is flush with the gap of the lower insulating base 4 b.
The technical scheme of the invention is further specifically optimized as follows: the cylindrical top-carrying protective sleeve 6 includes a semi-cylindrical top-carrying protective sleeve a6a and a semi-cylindrical top-carrying protective sleeve b6 b; the semi-cylindrical top-carrying protective sleeve a6a and the semi-cylindrical top-carrying protective sleeve b6b are both in the shape of a semi-cylindrical top-carrying sleeve, and are provided with sleeve outward extending bolt openings 21; the side surface of the semi-cylindrical top-carrying protective sleeve a6a is provided with a through hole for the audible and visual alarm 12, the middle part of the side surface of the semi-cylindrical top-carrying protective sleeve b6b is provided with a Z-shaped upper force transmission rod 1a through hole 15, and the through hole 15 is oval; the elbow-shaped lower dowel bar 1b is welded at the lower cover top of the semi-cylindrical top-carrying protective sleeve b6 b; the upper insulating base 4a is installed on the upper top covers of the semi-cylindrical top-carrying protective sleeve a6a and the semi-cylindrical top-carrying protective sleeve b6b through four first pre-tightening screws 17a, and the lower insulating base 4b is installed on the lower top covers of the semi-cylindrical top-carrying protective sleeve a6a and the semi-cylindrical top-carrying protective sleeve b6b through four second pre-tightening screws 17 b; the semi-cylindrical top protective sleeve a6a and the semi-cylindrical top protective sleeve b6b are combined by four first sleeve mounting bolts 18a and four second sleeve mounting bolts 18b through sleeve overhanging bolt openings.
Compared with the prior art, the invention has the following advantages and effects:
the method has the advantages that: the invention is detachable, because the elbow-shaped upper force transmission rod and the lower force transmission rod are connected with the scaffold connecting piece through the bidirectional connecting mantle fiber, the invention is easy to install and remove and can be repeatedly used; the cylindrical top protection sleeve is combined by the sleeve mounting bolt, so that the maintenance and the replacement of parts are facilitated.
The method has the advantages that: the invention has the sealing effect, and the through hole on the cylindrical top protective sleeve connected with the crank-shaped upper force transmission rod and the force transmission column is sealed by the sealing rubber sleeve, so the invention has the characteristics of dust prevention and moisture prevention.
The method has the advantages that: the invention has sensitive monitoring effect, the bent upper force transmission rod and the bent lower force transmission rod transmit the deformation of the scaffold steel pipe to the force transmission column, and the force transmission column impacts the piezoelectric crystal through the force transmission striker, thereby improving the reaction sensitivity of the piezoelectric crystal.
The advantages are that: the invention has better anti-interference performance, and the electric signal generated by the piezoelectric crystal can be filtered by the filter due to the instantaneous deformation of the scaffold steel pipe caused by the vibration generated by activities such as building construction or installation, and the like, thereby preventing the false alarm of the alarm.
The advantages are that: the invention can monitor the deformation condition of the scaffold steel pipe and send out an alarm before the scaffold steel pipe yields, thereby reminding constructors of withdrawing and repairing and reducing the loss of lives and properties.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a scaffold engineering buckling-restrained safety warning device adopting piezoelectric crystals according to the present invention;
FIG. 2 is a schematic front view of the structure of FIG. 1;
FIG. 3 is a schematic top view of the structure of FIG. 1;
FIG. 4 is a left side view of the structure of FIG. 1;
FIG. 5 is a schematic view of the structure of FIG. 1 taken along the line 1-1;
FIG. 6 is a schematic cross-sectional view taken along line 2-2 of FIG. 3;
FIG. 7 is a schematic view of a cylindrical protective sleeve;
FIG. 8 is a schematic view of the three-dimensional disassembled structure of FIG. 1;
FIG. 9 is a schematic diagram of a piezoelectric crystal and a force-transmitting column;
fig. 10 is a schematic view of a mounting-plate-member connection structure.
In the figure: 1. a dowel bar; 1a, a Z-shaped upper force transmission rod; 1b, a crank-shaped lower dowel bar; 2. a combined force transmission column; 2a, a force transmission column; 2b, an upper transmission striker; 2c, a lower force transmission striker; 3. a piezoelectric crystal; 3a, an upper piezoelectric crystal; 3b, a lower voltage transistor; 4. an insulating base; 4a, an upper insulating base; 4b, a lower insulating base; 5. mounting a plate; 6. a cylindrical top protective sleeve; 6a, a semi-cylindrical top protection sleeve a; 6b, a semi-cylindrical top protection sleeve b; 7. sealing the rubber sleeve; 8. a wire; 9. a power amplifier; 10. a filter; 11. a microprocessor; 12. sound and light alarm; 13a, a first bidirectional connecting mantle fiber; 13b, a second bidirectional connecting mantle fiber; 14a, a first scaffold link; 14b, a second scaffold link; 15. a through hole; 16a, a first insulating coating; 16b, a second insulating coating; 17a, a first pre-tightening screw; 17b, a second pre-tightening screw; 18a, a first sleeve mounting bolt; 18b, a second sleeve mounting bolt; 19. scaffold steel pipes; 20a, a first wire via; 20b, a second wire via; 21. the sleeve extends out of the bolt opening.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings, in order that the present disclosure may be more fully understood and fully conveyed to those skilled in the art. While the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the invention is not limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1 to 10, a scaffold engineering buckling-restrained safety early warning device using piezoelectric crystals comprises a dowel bar 1, a combined dowel column 2, a piezoelectric crystal 3, an insulating base 4, a mounting plate 5, a cylindrical top protective sleeve 6, a power amplifier 9, a filter 10, a microprocessor 11 and an acousto-optic alarm 12;
the dowel bar 1 comprises a Z-shaped upper dowel bar 1a and a crank-shaped lower dowel bar 1 b; the lower end of the Z-shaped upper force transmission rod 1a is welded with the combined force transmission column 2; the upper end of the crank-shaped lower dowel bar 1b is welded on the top cover at the lower part of the cylindrical top-protecting sleeve 6;
the combined dowel post 2 is connected with the dowel bar 1, the piezoelectric crystals 3 are arranged at two ends of the combined dowel post 2, the mounting plate 5 is arranged between the two insulating bases 4, and the cylindrical top protective sleeve 6 is arranged outside the device; the piezoelectric crystal 3 is connected with a power amplifier 9 arranged on the mounting plate 5 through a lead 8, the output end of the power amplifier 9 is connected with a filter 10 arranged on the mounting plate 5, the output end of the filter 10 is connected with a microcomputer processor 11 arranged on the mounting plate 5, and the microcomputer processor 11 transmits an electric signal to an acousto-optic alarm 12.
The dowel bar 1 comprises a Z-shaped upper dowel bar 1a and a crank-shaped lower dowel bar 1 b; the lower end of a Z-shaped upper force transmission rod 1a is welded with a combined force transmission column 2 through a through hole 15 arranged in the middle of the side face of a cylindrical top protective sleeve 6, a sealing rubber sleeve 7 is bonded on the Z-shaped upper force transmission rod 1a and the cylindrical top protective sleeve 6 to seal the through hole 15, the upper end of the Z-shaped upper force transmission rod 1a is connected with a first scaffold connecting piece 14a through a first bidirectional connecting mantle fiber 13a, and the first scaffold connecting piece 14a is welded on a scaffold steel pipe 19; the upper end of the crank-shaped lower dowel bar 1b is welded at the left position of the top cover at the lower part of the cylindrical top-protecting sleeve 6, the lower end of the crank-shaped lower dowel bar 1b is connected with a second scaffold connecting piece 14b through a second bidirectional connecting mantle fiber 13b, and the second scaffold connecting piece 14b is welded on a scaffold steel pipe 19; the first scaffold connecting piece 14a is semicircular, and the Z-shaped upper force transmission rod 1a, the crutch-shaped lower force transmission rod 1b and the scaffold connecting piece are made of stainless steel.
The combined force transmission column 2 comprises a force transmission column 2a, an upper force transmission striker 2b and a lower force transmission striker 2 c; the lower end of a Z-shaped upper force transmission rod 1a is welded with the middle of a force transmission column 2a through hole 15 arranged in the middle of the side face of a cylindrical top protection sleeve 6, an upper force transmission striker 2b is welded in the middle of the upper end of the force transmission column 2a, a lower force transmission striker 2c is welded in the middle of the lower end of the force transmission column 2a, the upper force transmission striker 2b abuts against an upper piezoelectric crystal 3a, and the lower force transmission striker 2c abuts against a lower piezoelectric crystal 3 b; the force transmission column 2a is a cylinder and made of stainless steel, and the upper force transmission firing pin 2b and the lower force transmission firing pin 2c are in the shape of a long needle with a spherical top and made of stainless steel.
The piezoelectric crystal 3 comprises an upper piezoelectric crystal 3a and a lower piezoelectric crystal 3 b; the surfaces of the upper piezoelectric crystal 3a and the lower piezoelectric crystal 3b are silver-plated electrodes; a first insulating coating 16a is coated on the inner side of the upper piezoelectric crystal 3a and is isolated from the upper force transmission striker 2b, and a second insulating coating 16b is coated on the inner side of the lower piezoelectric crystal 3b and is isolated from the lower force transmission striker 2 c; the upper piezoelectric crystal 3a is adhered on the upper insulating base 4a, the lower piezoelectric crystal 3b is adhered on the lower insulating base 4b, the upper piezoelectric crystal 3a and the lower piezoelectric crystal 3b are square, and the material is quartz wafer or piezoelectric ceramics.
The insulating base 4 comprises an upper insulating base 4a and a lower insulating base 4 b; the upper insulating base 4a is installed on an upper top cover of the cylindrical top protective sleeve 6 through four first pre-tightening screws 17a, and the lower insulating base 4b is installed on a lower top cover of the cylindrical top protective sleeve 6 through four second pre-tightening screws 17 b; the upper insulating base 4a and the lower insulating base 4b are both 3/4 circular arc grooved columns, and the diameter of the notch is larger than that of the force transmission column 2 a; the upper insulation base 4a is provided with a first lead through hole 20a on the side of the notch, and the lower insulation base 4b is provided with a second lead through hole 20b on the side of the notch.
The mounting plate 5 is a rectangular insulating long plate, the side surface of the long side is arc-shaped and is matched with the cylindrical top protective sleeve 6, the upper end of the mounting plate is pasted on the upper insulating base 4a by high-strength adhesive and is parallel and level with the notch of the upper insulating base 4a, and the lower end of the mounting plate is pasted on the lower insulating base 4b by high-strength adhesive and is parallel and level with the notch of the lower insulating base 4 b.
The upper piezoelectric crystal 3a and the lower piezoelectric crystal 3b respectively form a signal output end; the power amplifier 9 is fixed on the mounting plate 5 by a high-strength adhesive, and the input end of the power amplifier is respectively connected with the two signal output ends through a lead 8; two output ends of the power amplifier 9 transmit output signals to the filter 10, the filter 10 is adhered to the mounting plate 5 through a high-strength adhesive, two input ends of the filter are respectively connected with two output ends of the power amplifier 9 through a wire 8, two output ends of the filter 10 transmit filtering signals to the microcomputer processor 11, the microcomputer processor 11 is connected with the acousto-optic alarm 12 through a wire, processing results are transmitted to the acousto-optic alarm 12, the acousto-optic alarm 12 is provided with a power supply key and a reset key, a built-in battery supplies power for the device, and alarming is carried out when an alarm condition occurs. The microcomputer processor 11 and the sound and light alarm 12 are both stuck on the mounting plate 5 by high-strength adhesive; the upper piezoelectric crystal 3a, the lower piezoelectric crystal 3b, the power amplifier 9, the filter 10 and the microprocessor 11 cannot be in contact with any metal except the lead 8.
Specifically, the amplifier 9 adopts an instrumentation amplifier AD620, and has the characteristics of high accuracy, high performance and low cost; the filter 10 adopts an OP07 high-precision operational amplifier, so that high-frequency interference in the environment can be suppressed; the microcomputer processor 11 adopts an AT89C51 chip, and can process signals and send out alarm instructions through assembly language.
The cylindrical topped protection sleeve 6 includes: a semi-cylindrical top protective sleeve a6a, a semi-cylindrical top protective sleeve b6 b; the semi-cylindrical top-provided protective sleeve a6a and the semi-cylindrical top-provided protective sleeve b6b are both in the shape of a semi-cylindrical top-provided sleeve, and are provided with sleeve outward extending bolt openings 21; the side surface of the semi-cylindrical top-carrying protective sleeve a6a is provided with a through hole for the audible and visual alarm 12, the middle part of the side surface of the semi-cylindrical top-carrying protective sleeve b6b is provided with a Z-shaped upper force transmission rod 1a through hole 15, and the through hole 15 is oval; the elbow-shaped lower dowel bar 1b is welded at the lower cover top of the semi-cylindrical top-carrying protective sleeve b6 b; the upper insulating base 4a is installed on the upper top covers of the semi-cylindrical top-carrying protective sleeve a6a and the semi-cylindrical top-carrying protective sleeve b6b through four first pre-tightening screws 17a, and the lower insulating base 4b is installed on the lower top covers of the semi-cylindrical top-carrying protective sleeve a6a and the semi-cylindrical top-carrying protective sleeve b6b through four second pre-tightening screws 17 b; the semi-cylindrical top protective sleeve a6a and the semi-cylindrical top protective sleeve b6b are combined through four first sleeve mounting bolts 18a and four second sleeve mounting bolts 18b through sleeve overhanging bolt openings.
A use method of a scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals comprises the following steps: when the device is used, the main body of the device is connected with the first scaffold link 14a and the second scaffold link 14b through the first bidirectional connecting mantle fiber 13a and the second bidirectional connecting mantle fiber 13b, the first scaffold link 14a and the scaffold link 13b are welded on the scaffold steel pipe 19 to prevent slippage, when the scaffold is yielding, the pressure side drives the force transmission rod 1 and the combined force transmission column 2 to extrude the piezoelectric crystal 3, the generated electric signal is processed and transmitted to the microcomputer processor 11, and when the signal strength exceeds a threshold value, the acousto-optic alarm 12 carries out acousto-optic early warning to achieve the purpose of scaffold steel pipe yielding early warning.
Although the embodiments have been described, once the basic inventive concept is obtained, other variations and modifications of these embodiments can be made by those skilled in the art, so that these embodiments are only examples of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that can be used in the present specification and drawings, or used directly or indirectly in other related fields are encompassed by the present invention.
Claims (7)
1. A scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals is characterized by comprising a dowel bar (1), a combined dowel column (2), piezoelectric crystals (3), an insulating base (4), a mounting plate (5), a cylindrical top protective sleeve (6), a power amplifier (9), a filter (10), a microcomputer processor (11) and an acousto-optic alarm (12);
wherein the dowel bar (1) comprises a Z-shaped upper dowel bar (1 a) and a crank-shaped lower dowel bar (1 b); the lower end of the Z-shaped upper force transmission rod (1 a) is welded with the combined force transmission column (2); the upper end of the crank-shaped lower dowel bar (1 b) is welded on the top cover at the lower part of the cylindrical top-carrying protective sleeve (6);
the combined dowel post (2) is connected with the dowel rod (1), the piezoelectric crystal (3) is arranged at two ends of the combined dowel post (2), the mounting plate (5) is arranged between the two insulating bases (4), and the cylindrical top protective sleeve (6) is arranged outside the device; the piezoelectric crystal (3) is connected with a power amplifier (9) arranged on the mounting plate (5) through a lead (8), the output end of the power amplifier (9) is connected with a filter (10) arranged on the mounting plate (5), the output end of the filter (10) is connected with a microcomputer processor (11) arranged on the mounting plate (5), and the microcomputer processor (11) transmits an electric signal to an acousto-optic alarm (12).
2. The scaffold engineering buckling-restrained safety early warning device adopting piezoelectric crystals as claimed in claim 1, wherein the lower end of the Z-shaped upper force transmission rod (1 a) is welded with the combined force transmission column (2) through a through hole (15) formed in the middle of the side surface of the cylindrical top protective sleeve (6), a sealing rubber sleeve (7) is bonded on the Z-shaped upper force transmission rod (1 a) and the cylindrical top protective sleeve (6) to seal the through hole (15), the upper end of the Z-shaped upper force transmission rod (1 a) is connected with the first scaffold connecting piece (14 a) through a first bidirectional connecting mantle fiber (13 a), and the first scaffold connecting piece (14 a) is welded on a scaffold steel pipe (19);
the upper end of the crank-shaped lower dowel bar (1 b) is welded at the left position of a top cover at the lower part of the cylindrical top-protecting sleeve (6), the lower end of the crank-shaped lower dowel bar (1 b) is connected with a second scaffold connecting piece (14 b) through a second bidirectional connecting mantle fiber (13 b), and the second scaffold connecting piece (14 b) is welded on a scaffold steel pipe (19); the second scaffold connecting piece (14 b) is in a semicircular ring shape;
the Z-shaped upper dowel bar (1 a), the crutch-shaped lower dowel bar (1 b), the first scaffold connecting piece (14 a) and the second scaffold connecting piece (14 b) are all made of stainless steel.
3. The scaffold engineering buckling-restrained safety precaution device of claim 1, characterized in that, the combined force transmission column (2) includes a force transmission column (2 a), an upper force transmission striker (2 b) and a lower force transmission striker (2 c);
the lower end of a Z-shaped upper force transmission rod (1 a) is welded with the middle part of a force transmission column (2 a) through a through hole (15) formed in the middle of the side surface of a cylindrical top protective sleeve (6), an upper force transmission striker (2 b) is welded in the middle of the upper end of the force transmission column (2 a), a lower force transmission striker (2 c) is welded in the middle of the lower end of the force transmission column (2 a), the upper force transmission striker (2 b) is abutted against an upper piezoelectric crystal (3 a), and the lower force transmission striker (2 c) is abutted against a lower piezoelectric crystal (3 b);
the force transmission column (2 a) is a cylinder and is made of stainless steel; the upper force transmission firing pin (2 b) and the lower force transmission firing pin (2 c) are in a shape of a long needle with a spherical top and are made of stainless steel.
4. The scaffold engineering buckling-restrained safety precaution device that adopts piezoelectric crystal of claim 1, characterized in that, the piezoelectric crystal (3) includes upper piezoelectric crystal (3 a) and lower piezoelectric crystal (3 b);
the surfaces of the upper piezoelectric crystal (3 a) and the lower piezoelectric crystal (3 b) are silver-plated electrodes; the inner side of the upper piezoelectric crystal (3 a) is coated with a first insulating coating (16 a) to be isolated from the upper force transmission striker (2 b), and the inner side of the lower piezoelectric crystal (3 b) is coated with a second insulating coating (16 b) to be isolated from the lower force transmission striker (2 c); an upper piezoelectric crystal (3 a) is pasted on the upper insulating base (4 a), and a lower piezoelectric crystal (3 b) is pasted on the lower insulating base (4 b); the upper piezoelectric crystal (3 a) and the lower piezoelectric crystal (3 b) are square, and the materials of the upper piezoelectric crystal and the lower piezoelectric crystal are quartz wafers or piezoelectric ceramics.
5. The scaffold engineering buckling-restrained safety precaution device that adopts piezoelectric crystal of claim 1, characterized in that, the insulating base (4) includes upper insulating base (4 a) and lower insulating base (4 b);
the upper insulating base (4 a) is installed on an upper top cover of the cylindrical top-carrying protective sleeve (6) through four first pre-tightening screws (17 a), and the lower insulating base (4 b) is installed on a lower top cover of the cylindrical top-carrying protective sleeve (6) through four second pre-tightening screws (17 b); the upper insulating base (4 a) and the lower insulating base (4 b) are both 3/4 circular arc grooved columns, and the diameter of the notch is larger than that of the force transmission column (2 a); a first lead through hole (20 a) is formed in the side face of the notch of the upper insulating base (4 a), and a second lead through hole (20 b) is formed in the side face of the notch of the lower insulating base (4 b).
6. The scaffold engineering buckling-restrained safety warning device adopting piezoelectric crystals as claimed in claim 1, wherein the mounting plate (5) is a rectangular insulating long plate, and the side surface of the long side of the mounting plate is arc-shaped; the mounting plate (5) is matched with the cylindrical top protective sleeve (6); the upper end of the mounting plate (5) is adhered to the upper insulating base (4 a) by a high-strength adhesive and is flush with the notch of the upper insulating base (4 a); the lower end of the mounting plate (5) is pasted on the lower insulating base (4 b) by using a high-strength binder and is flush with the notch of the lower insulating base (4 b).
7. The scaffold engineering buckling-restrained safety precaution device that adopts piezoelectric crystals according to claim 1, characterized in that the cylindrical top protective sleeve (6) includes a semi-cylindrical top protective sleeve a (6 a) and a semi-cylindrical top protective sleeve b (6 b);
the semi-cylindrical top-mounted protective sleeve a (6 a) and the semi-cylindrical top-mounted protective sleeve b (6 b) are both in a semi-cylindrical top-mounted sleeve shape and are provided with sleeve outward extending bolt openings (21); a through hole is reserved on the side surface of the semi-cylindrical top-carrying protective sleeve a (6 a) for an acousto-optic alarm (12), a Z-shaped upper force transmission rod (1 a) through hole (15) is arranged in the middle of the side surface of the semi-cylindrical top-carrying protective sleeve b (6 b), and the through hole (15) is oval; the corner-shaped lower dowel bar (1 b) is welded at the lower cover top of the semi-cylindrical top-equipped protective sleeve b (6 b); the upper insulating base (4 a) is installed on upper top covers of the semi-cylindrical top-carrying protective sleeve a (6 a) and the semi-cylindrical top-carrying protective sleeve b (6 b) through four first pre-tightening screws (17 a), and the lower insulating base (4 b) is installed on lower top covers of the semi-cylindrical top-carrying protective sleeve a (6 a) and the semi-cylindrical top-carrying protective sleeve b (6 b) through four second pre-tightening screws (17 b); the semi-cylindrical top protective sleeve a (6 a) and the semi-cylindrical top protective sleeve b (6 b) are combined through four first sleeve mounting bolts (18 a) and four second sleeve mounting bolts (18 b) through sleeve outward extending bolt openings.
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| CN101995209B (en) * | 2010-09-16 | 2012-05-23 | 上海电缆研究所 | Aerial conductor bending amplitude sensor |
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