CN112767658A - Load-bearing wall column beam protection device and detection method thereof - Google Patents
Load-bearing wall column beam protection device and detection method thereof Download PDFInfo
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- CN112767658A CN112767658A CN201911062473.3A CN201911062473A CN112767658A CN 112767658 A CN112767658 A CN 112767658A CN 201911062473 A CN201911062473 A CN 201911062473A CN 112767658 A CN112767658 A CN 112767658A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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Abstract
The invention relates to the technical field of capital construction engineering, in particular to a protective device for a bearing wall column beam and a detection method thereof, wherein the protective device for the column beam comprises a protective mechanism and a detection mechanism which are paved on the outer side of the column beam, the protective mechanism comprises a damage detection layer and a protective layer which are paved on the inner side of the column beam and the outer side of the column beam, the damage detection layer is electrically connected with an alarm, the detection mechanism comprises a controller, a pressure sensor, a vibration sensor and a laser sensor which are installed on the column beam, the pressure sensor, the vibration sensor and the laser sensor are used for detecting the verticality of the column beam, the pressure sensor, the vibration sensor and the laser sensor are all electrically connected with the controller, the invention can monitor whether the column beam is damaged in real time, timely detect the column beam after the column beam is damaged by mistake and reduce the loss to the minimum, a soft ash layer and a metal reinforcing, reducing the risk of being mistakenly damaged.
Description
Technical Field
The invention relates to the technical field of capital construction engineering, in particular to a protective device for a bearing wall column beam and a detection method thereof.
Background
With the rapid development of domestic buildings, a high building is pulled up, and business activities are more frequent, particularly the development of storefront business. However, it follows that there are very rough decorations, such as: the forklift is opened to directly carry out violent destruction type demolition on the decoration or even directly demolish the bearing wall for expanding the space, so that the weighed building or the bearing beam is damaged, serious threats are caused to residents on the building, and the house newly built for several years also becomes a dangerous house quickly. Meanwhile, in order to reduce cost, some building construction units replace the types of the steel bars privately, so that the bearing capacity of the building is weakened, and serious wall columns deform to threaten the safety of residents.
Disclosure of Invention
The invention aims to provide a load-bearing wall column beam protection device and a detection method thereof, which aim to solve the technical problems in the prior art.
The utility model provides a bearing wall post roof beam protection device, post roof beam protection device is including laying protection mechanism and the detection mechanism in the post roof beam outside, protection mechanism has laid damage detection layer and protective layer including from the inboard outside of post roof beam, damage detection layer electricity is connected with the alarm, detection mechanism is including the controller, install pressure sensor, the vibration sensor on the post roof beam and be used for detecting the straightness's that hangs down of post roof beam laser sensor, pressure sensor, vibration sensor and laser sensor all with controller electric connection.
Further, the damage detection layer is an injury detection net, the damage detection layer is an electrified metal net, the damage detection layer is electrically connected with a damage detection sensor, and the damage detection sensor is electrically connected with the controller.
Further, the breakage detection sensor is an inductive sensor, and the breakage detection sensor is magnetically matched with the breakage detection layer.
Further, the damage detection layer is the liquid layer, the protective layer is provided with the pipeline that communicates with the liquid layer, the water inlet of pipeline is provided with level sensor, level sensor and controller electric connection, be equipped with the liquid of sign color in the liquid layer.
Further, be provided with soft grey layer between damaged detection layer and the wall post, be provided with the metal reinforcing plate between damaged detection layer and the protective layer.
Further, a detection method of the load-bearing wall column beam protection device is characterized by comprising the following steps:
detection of a protection mechanism: when the column beam is damaged by impact, and the damage detection layer is damaged and powered off, the damage detection sensor cannot detect the damage detection layer, an electric signal is transmitted to the controller, and the controller controls the alarm to send an alarm signal;
the detection mechanism detects: when the column beam is impacted and damaged, the pressure applied to the pressure sensor exceeds the warning value, an electric signal is transmitted to the controller, and the controller controls the alarm to send out an alarm signal;
if the vibration frequency detected by the vibration sensor exceeds the warning value, an electric signal is transmitted to the controller, and the controller controls the alarm to send out an alarm signal;
stress protection detection: when the column beam is inclined or the pressure is increased to form cracks, the time of the laser sensor for detecting the light source is shorter than a preset value, or the incident angle is changed, an electric signal is transmitted to the controller, and the controller controls the alarm to send out an alarm signal.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the invention can monitor whether the column beam is damaged in real time, timely detect the column beam after being mistakenly damaged, and reduce the loss to the minimum.
Secondly, the soft ash layer and the metal reinforcing plate in the protection mechanism improve the strength of the column beam and reduce the risk of being damaged by mistake.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic perspective view of a column beam according to the present invention;
FIG. 2 is a schematic view of a structural assembly of a column and a beam and a damage detection layer according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structural assembly of a second column beam, a damage detection layer and a soft ash layer according to an embodiment of the present invention;
FIG. 4 is a schematic view of the structural assembly of the three-column beam, the damage detection layer, the soft ash layer and the liquid layer according to the embodiment of the present invention;
FIG. 5 is a schematic view of the structural assembly of a second column beam, a pipeline and a liquid level sensor according to an embodiment of the present invention;
FIG. 6 is a schematic view of the structural assembly of the second pillar beam, the damage detection layer, the soft ash layer and the metal reinforcing plate according to the embodiment of the present invention;
FIG. 7 is a schematic view of the structural assembly of the column beam, vibration sensor and pressure sensor of the present invention;
FIG. 8 is a schematic view of the structural assembly of the beam and laser sensor of the present invention;
reference numerals: column beam 1, damaged detection layer 2, protective layer 3, pressure sensor 4, vibration sensor 5, laser sensor 6, damaged detection sensor 7, liquid layer 8, level sensor 9, soft ash layer 10, metal reinforcing plate 11, alarm 12, pipeline 13.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 8, a protective device for a column beam of a load-bearing wall, the protective device for the column beam comprises a protective mechanism and a detection mechanism which are paved on the outer side of the column beam 1, the protective mechanism comprises a damage detection layer 2 and a protective layer 3 which are paved on the inner side of the column beam 1 and the outer side of the column beam, the damage detection layer 2 is electrically connected with an alarm 12, the detection mechanism comprises a controller, a pressure sensor 4, a vibration sensor 5 and a laser sensor 6 which are installed on the column beam 1, the pressure sensor 4, the vibration sensor 5 and the laser sensor 6 are all electrically connected with the controller, when the protective layer 3 is damaged, the time from the light source emitting to the light source receiving of the laser sensor 6 is shortened, the light source route is blocked, an electric signal is transmitted to the controller, when the vibration sensor 5 detects that the vibration frequency of the column beam 1 is greater than a preset value, an electric signal is transmitted to a controller, when the pressure sensor 4 detects that the pressure applied to the controller is larger than a preset value, the electric signal is transmitted to the controller, any one of the three signals is transmitted to the controller, the controller controls the alarm 12 to give an alarm, and simultaneously transmits an electric signal to relevant departments to stop relevant injury behaviors in time, the controller is a single chip microcomputer, and the type of the single chip microcomputer is AT89C 2051;
the laser sensor 6 is a reflective laser sensor 6, and its model is PS117ED1, and its operating principle: the laser diode is aimed at a target to emit laser pulses, the laser pulses are scattered in all directions after being reflected by the target, part of scattered light returns to the sensor receiver and is imaged on the avalanche photodiode after being received by the optical system, the avalanche photodiode is an optical sensor with an amplification function inside, therefore, the avalanche photodiode can detect extremely weak optical signals and record and process the time from the emission of the optical pulses to the return of the optical pulses to be received, namely, the distance of the target can be measured, the optical fiber is additionally arranged on the emission route of the laser sensor, the stress changes and generates distortion, so that the incident angle changes, the optical fiber bends, the change of the time from the emission of the optical pulses to the return of the optical pulses to be received is recorded, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to emit an alarm signal.
The pressure sensor 4 is a piezoresistive pressure sensor 4, the model number of which is PT124G-213, and the working principle is as follows: the piezoresistive pressure sensor 4 is formed by using piezoresistive effect of monocrystalline silicon, a monocrystalline silicon wafer is used as an elastic element, a group of equivalent resistors are diffused in a specific direction of the monocrystalline silicon on the monocrystalline silicon wafer by using the process of an integrated circuit, the resistors are connected into a bridge circuit, and the monocrystalline silicon wafer is arranged in a sensor cavity. When the pressure changes, the monocrystalline silicon generates strain, so that the strain resistance directly diffused on the monocrystalline silicon generates change in direct proportion to the measured pressure, and then a bridge circuit obtains a corresponding voltage output signal.
The vibration sensor 5 is a piezoelectric vibration sensor 5, and the model number of the vibration sensor is GJ-0317.
Be provided with soft grey layer 10 between damaged detection layer 2 and the wall post, be provided with metal reinforcing plate 11 between damaged detection layer 2 and the protective layer 3, can receive destruction when post roof beam 1, receive soft grey layer 10's distance protection, can not directly harm post roof beam 1 main part.
The house is added to protect the stress, namely when the column is not damaged but is inclined or the pressure is increased, the laser sensor 6 detects that the time of the light source is shorter than the preset value or the incident angle is changed, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to send out an alarm signal.
The controller transmits the alarm signal to the security room, the street office and the room management office at the same time, the security room, the street office and the room management office take measures in time, the alarm information is filed, meanwhile, a person is dispatched to check the place where the alarm signal occurs and stop related behaviors, and the measures are processed correspondingly.
Example two:
as shown in fig. 1 to 8, a protective device for a column beam of a load-bearing wall, the protective device for the column beam comprises a protective mechanism and a detection mechanism which are paved on the outer side of the column beam 1, the protective mechanism comprises a damage detection layer 2 and a protective layer 3 which are paved on the inner side of the column beam 1 and the outer side of the column beam, the damage detection layer 2 is electrically connected with an alarm 12, the detection mechanism comprises a controller, a pressure sensor 4, a vibration sensor 5 and a laser sensor 6 which are installed on the column beam 1, the pressure sensor 4, the vibration sensor 5 and the laser sensor 6 are all electrically connected with the controller, when the protective layer 3 is damaged, the time from the light source emitting to the light source receiving of the laser sensor 6 is shortened, the light source route is blocked, an electric signal is transmitted to the controller, when the vibration sensor 5 detects that the vibration frequency of the column beam 1 is greater than a preset value, an electric signal is transmitted to a controller, when the pressure sensor 4 detects that the pressure applied to the controller is larger than a preset value, the electric signal is transmitted to the controller, any one of the three signals is transmitted to the controller, the controller controls the alarm 12 to give an alarm, and simultaneously transmits an electric signal to relevant departments to stop relevant injury behaviors in time, the controller is a single chip microcomputer, and the type of the single chip microcomputer is AT89C 2051;
the laser sensor 6 is a reflective laser sensor 6, and its model is PS117ED1, and its operating principle: the laser diode is aimed at a target to emit laser pulses, the laser pulses are scattered in all directions after being reflected by the target, part of scattered light returns to the sensor receiver and is imaged on the avalanche photodiode after being received by the optical system, the avalanche photodiode is an optical sensor with an amplification function inside, therefore, the avalanche photodiode can detect extremely weak optical signals and record and process the time from the emission of the optical pulses to the return of the optical pulses to be received, namely, the distance of the target can be measured, the optical fiber is additionally arranged on the emission route of the laser sensor, the stress changes and generates distortion, so that the incident angle changes, the optical fiber bends, the change of the time from the emission of the optical pulses to the return of the optical pulses to be received is recorded, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to emit an alarm signal.
The pressure sensor 4 is a piezoresistive pressure sensor 4, the model number of which is PT124G-213, and the working principle is as follows: the piezoresistive pressure sensor 4 is formed by using piezoresistive effect of monocrystalline silicon, a monocrystalline silicon wafer is used as an elastic element, a group of equivalent resistors are diffused in a specific direction of the monocrystalline silicon on the monocrystalline silicon wafer by using the process of an integrated circuit, the resistors are connected into a bridge circuit, and the monocrystalline silicon wafer is arranged in a sensor cavity. When the pressure changes, the monocrystalline silicon generates strain, so that the strain resistance directly diffused on the monocrystalline silicon generates change in direct proportion to the measured pressure, and then a bridge circuit obtains a corresponding voltage output signal.
The vibration sensor 5 is a piezoelectric vibration sensor 5, and the model number of the vibration sensor is GJ-0317.
Be provided with soft grey layer 10 between damaged detection layer 2 and the wall post, be provided with metal reinforcing plate 11 between damaged detection layer 2 and the protective layer 3, can receive destruction when post roof beam 1, receive soft grey layer 10's distance protection, can not directly harm post roof beam 1 main part, metal reinforcing plate 11 can strengthen the protection to post roof beam 1.
The controller transmits the alarm signal to the security room, the street office and the room management office at the same time, the security room, the street office and the room management office take measures in time, the alarm information is filed, meanwhile, a person is dispatched to check the place where the alarm signal occurs and stop related behaviors, and the measures are processed correspondingly.
Example three:
as shown in fig. 1 to 8, a protective device for a column beam of a load-bearing wall, the protective device for the column beam comprises a protective mechanism and a detection mechanism which are paved on the outer side of the column beam 1, the protective mechanism comprises a damage detection layer 2 and a protective layer 3 which are paved on the inner side of the column beam 1 and the outer side of the column beam, the damage detection layer 2 is electrically connected with an alarm 12, the detection mechanism comprises a controller, a pressure sensor 4, a vibration sensor 5 and a laser sensor 6 which are installed on the column beam 1, the pressure sensor 4, the vibration sensor 5 and the laser sensor 6 are all electrically connected with the controller, when the protective layer 3 is damaged, the time from the light source emitting to the light source receiving of the laser sensor 6 is shortened, the light source route is blocked, an electric signal is transmitted to the controller, when the vibration sensor 5 detects that the vibration frequency of the column beam 1 is greater than a preset value, an electric signal is transmitted to a controller, when the pressure sensor 4 detects that the pressure applied to the controller is larger than a preset value, the electric signal is transmitted to the controller, any one of the three signals is transmitted to the controller, the controller controls the alarm 12 to give an alarm, and simultaneously transmits an electric signal to relevant departments to stop relevant injury behaviors in time, the controller is a single chip microcomputer, and the type of the single chip microcomputer is AT89C 2051;
the laser sensor 6 is a reflective laser sensor 6, and its model is PS117ED1, and its operating principle: the laser diode is aimed at a target to emit laser pulses, the laser pulses are scattered in all directions after being reflected by the target, part of scattered light returns to the sensor receiver and is imaged on the avalanche photodiode after being received by the optical system, and the avalanche photodiode is an optical sensor with an amplification function inside, so that the avalanche photodiode can detect extremely weak optical signals, record and process the time from the emission of the optical pulses to the return of the optical pulses to be received, and measure the distance of the target.
The pressure sensor 4 is a piezoresistive pressure sensor 4, the model number of which is PT124G-213, and the working principle is as follows: the piezoresistive pressure sensor 4 is formed by using piezoresistive effect of monocrystalline silicon, a monocrystalline silicon wafer is used as an elastic element, a group of equivalent resistors are diffused on the monocrystalline silicon wafer in a specific direction by using the process of an integrated circuit, the resistors are connected into a bridge circuit, the monocrystalline silicon wafer is arranged in a sensor cavity, when pressure changes, the monocrystalline silicon generates strain, the strain resistors directly diffused on the monocrystalline silicon generate change in direct proportion to the pressure to be measured, and then the bridge circuit obtains a corresponding voltage output signal.
The vibration sensor 5 is a piezoelectric vibration sensor 5, and the model number of the vibration sensor is GJ-0317.
The damage detection layer 2 is liquid layer 8, the protective layer 3 is provided with pipeline 13 with 8 intercommunications in liquid layer, the water inlet of pipeline 13 is provided with level sensor 9, level sensor 9 and controller electric connection, the liquid of sign color is equipped with in the liquid layer, all damages when post roof beam 1, and liquid leakage, level sensor 9 detect the liquid level in the liquid layer 8 and are less than the default, and an electric signal of transmission gives the controller, and controller control alarm 12 sends alarm signal and gives relevant department, carries out emergency treatment to this incident, level sensor 9 is static pressure level sensor 9, and the model is DATA-51.
Be provided with soft grey layer 10 between damaged detection layer 2 and the wall post, be provided with metal reinforcing plate 11 between damaged detection layer 2 and the protective layer 3, can receive destruction when post roof beam 1, receive soft grey layer 10's distance protection, can not directly harm post roof beam 1 main part, metal reinforcing plate 11 can strengthen the protection to post roof beam 1.
The marking color has an eye-catching visual effect, the color visual effect of the liquid of the marking color is obvious, for example, red, when the column beam is inclined or the pressure is increased, a crack is formed, so that the liquid flows out, and people can quickly perceive and stop the behavior.
Example four:
a detection method for a load-bearing wall column beam protection device is characterized by comprising the following steps:
detection of a protection mechanism: when the column beam 1 is damaged by impact, the damage detection layer 2 is damaged and powered off, and the damage detection sensor 7 cannot detect the damage detection layer 2, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to send an alarm signal;
the detection mechanism detects: when the column beam 1 is impacted and damaged, and the pressure applied to the pressure sensor 4 exceeds the warning value, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to send out an alarm signal;
if the vibration frequency detected by the vibration sensor 5 exceeds the warning value, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to send out an alarm signal;
when the laser sensor 6 detects that the time of the light source is shorter than a preset value or the incident angle is changed, an electric signal is transmitted to the controller, and the controller controls the alarm 12 to send out an alarm signal.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a bearing wall post roof beam protection device, a serial communication port, post roof beam protection device is including laying protection machanism and the detection mechanism in post roof beam (1) outside, protection machanism has laid damage detection layer (2) and protective layer (3) including from post roof beam (1) inboard outside, damage detection layer (2) electricity is connected with alarm (12), detection mechanism is including the controller, install pressure sensor (4), vibration sensor (5) on post roof beam (1) and be used for detecting the straightness's that hangs down laser sensor (6) of post roof beam (1), pressure sensor (4), vibration sensor (5) and laser sensor (6) all with controller electric connection.
2. A load-bearing wall column beam protection device according to claim 1, wherein said damage detection layer (2) is an injury detection net, said damage detection layer (2) is an electrified metal net, said damage detection layer (2) is electrically connected with a damage detection sensor (7), said damage detection sensor (7) is electrically connected with a controller.
3. A load bearing wall stud beam protection device according to claim 2, wherein the breakage detection sensor (7) is an inductive sensor, the breakage detection sensor (7) being magnetically coupled to the breakage detection layer (2).
4. A load-bearing wall column beam protection device according to claim 1, wherein the damage detection layer (2) is a liquid layer (8), the protection layer (3) is provided with a pipeline (13) communicated with the liquid layer (8), a water inlet of the pipeline (13) is provided with a liquid level sensor (9), the liquid level sensor (9) is electrically connected with a controller, and liquid with a mark color is filled in the liquid layer.
5. A load-bearing wall column beam protection device according to claim 1, characterized in that a soft ash layer (10) is arranged between the damage detection layer (2) and the wall column, and a metal reinforcing plate (11) is arranged between the damage detection layer (2) and the protection layer (3).
6. The detection method for the load-bearing wall, column and beam protection device as claimed in claims 1-5, wherein the method comprises the following steps:
detection of a protection mechanism: when the column beam (1) is damaged by impact, the damage detection layer (2) is damaged and the power is cut off, and the damage detection sensor (7) cannot detect the damage detection layer (2), an electric signal is transmitted to the controller, and the controller controls the alarm (12) to send an alarm signal;
the detection mechanism detects: when the column beam (1) is damaged by impact, and the pressure applied to the pressure sensor (4) exceeds an alarm value, an electric signal is transmitted to the controller, and the controller controls the alarm (12) to send an alarm signal;
if the vibration frequency detected by the vibration sensor (5) exceeds the warning value, an electric signal is transmitted to the controller, and the controller controls the alarm (12) to send out an alarm signal;
stress protection detection: when the column beam is inclined or the pressure is increased to form cracks, the time of the laser sensor (6) for detecting the light source is shorter than a preset value, or the incident angle is changed, an electric signal is transmitted to the controller, and the controller controls the alarm (12) to send out an alarm signal.
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Application publication date: 20210507 |