Safety alarm device for hoisting operation of tower crane

Abstract

The utility model provides a safety alarm device for hoisting operation of a tower crane, and relates to the technical field of constructional engineering. The device comprises a radar sound wave probe arranged on a tower crane chassis, a controller, an alarm arranged in a tower crane cab and an operation warning lamp, the operation warning lamps are respectively arranged at two ends of a jacking mechanism, a chassis and a big arm of the tower crane; the radar sound wave probe, the alarm and the operation warning lamp are all connected to the controller. The radar sound wave probe is used for generating an electric signal and sending the electric signal to the controller when detecting that an object in a moving state exists in a hoisting operation range of the tower crane; the controller is used for controlling the alarm to send out an alarm signal after receiving the electric signal and controlling the warning lamp to flicker. In the device, the radar sound wave probe can check illegal persons in the operation range, the alarm can remind hoisting workers to stop operation, the operation warning lamp and the voice broadcast device can remind the illegal persons to leave, the occurrence rate of safety accidents can be reduced, and the safety of hoisting operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering, in particular to a safety alarm device for tower crane hoisting operations. Background Art

[0002] Generally, a tower crane consists of a structure, a mechanism, an electrical device, a safety device, and other auxiliary devices according to its functions and working natures. During the hoisting process of the tower crane, there are many safety risks such as poor visibility, many blind spots, complex lower working environments and working conditions. During the hoisting operation, the driver's observation range is limited, and it is impossible to avoid the above safety risks by personal ability, so the safety of the hoisting operation cannot be guaranteed. Summary of the Utility Model

[0003] To solve the above technical problems existing in the prior art, the utility model aims to provide a safety device that can automatically identify moving objects within the operation range of the tower crane and issue an alarm.

[0004] To achieve the above object, the utility model provides a safety alarm device for tower crane hoisting operations, specifically including:

[0005] A radar acoustic wave probe, an alarm, operation warning lights, and a controller;

[0006] The radar acoustic wave probe is arranged on the tower crane chassis, the alarm is arranged in the tower crane cab, and there are multiple operation warning lights, which are respectively arranged at the jacking mechanism, the chassis, and both ends of the jib of the tower crane;

[0007] The radar acoustic wave probe, the alarm, and the operation warning lights are all connected to the controller;

[0008] The radar acoustic wave probe is used to generate an electrical signal and send it to the controller when an object in a moving state is detected within the hoisting operation range of the tower crane;

[0009] The controller is used to control the alarm to issue an alarm signal and control the warning lights to flash after receiving the electrical signal.

[0010] Preferably, there are multiple radar acoustic wave probes, which are respectively arranged around the tower crane chassis.

[0011] Furthermore, the safety alarm device further includes a voice recording device and a voice broadcaster;

[0012] The voice recording device is arranged in the cab;

[0013] The voice broadcaster is arranged on the tower crane chassis, connected to the controller and the voice recording device, and is used to play a preset warning voice and the voice real-time recorded by the driver through the voice recording device.

[0014] It can be seen that in the technical solution provided by the present utility model, the warning light can remind non-hoisting personnel to stay away from the operation range of the tower crane. The radar acoustic wave probe can detect people or objects in a moving state within the entire operation range of the tower crane in real time, and remind the driver through the alarm, so as to avoid safety accidents caused by the driver's misjudgment due to poor vision, large blind areas, and complex operation environments and situations, and improve the safety of hoisting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the safety alarm device for tower crane hoisting operations in the present utility model.

[0016] Figure 2 It is a schematic diagram of the principle of realizing the alarm work by applying the radar acoustic wave probe in the present utility model.

[0017] Figure 3 It is a schematic diagram of the radar acoustic wave probe combined with the voice reminder device.

[0018] Figure 4 It is a schematic diagram of the radar acoustic wave early warning principle.

[0019] Figure 5 It is a schematic structural diagram of the radar acoustic wave sensor.

[0020] The meanings of the reference numerals in the figure are as follows: radar acoustic wave probe - 1, alarm - 2, operation warning light - 3, voice input device - 4, voice broadcaster - 5, tower crane hoisting switch - 6, controller - 7, metal shell - 8, conductive screw - 9, wiring piece - 10, piezoelectric wafer - 11, protective film - 12, absorption block - 13. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Hereinafter, the technical solution proposed by the present utility model will be further elaborated in detail with reference to the accompanying drawings.

[0022] The tower crane involved in the present utility model is divided into a tower crane traveling mechanism, a chassis assembly, a jacking mechanism, a slewing assembly, a tower tip, a counterweight arm, a counterweight, a boom, etc. The chassis assembly of the tower crane is assembled from parts such as cross beams, half beams, diagonal braces, and foundation sections. In an actual case, the hook height of the tower crane in the hub project of the hydropower station factory area exceeds 30 meters, with a total weight of about 10.5 tons. The tower crane is installed with 7 standard sections, and the height that the hook can reach is 34.63 meters. The counterweight is configured to be placed in three layers, with a total counterweight weight of 31.8 tons.

[0023] Statistics show that hoisting operations are one of the main causes of tower crane accidents. In minor cases, parts are damaged and the structure is deformed. In severe cases, major accidents such as personnel injuries, equipment boom folding, and the whole machine overturning may occur. For example Figure 1As shown in the figure, according to the hoisting work characteristics of the tower crane, a radar acoustic wave warning device is installed on the tower crane, and safety warning is realized through the principle of transmitting and receiving radar acoustic waves. After the radar acoustic wave is emitted and meets an object, it is reflected by the acoustic wave. The time difference between the emitted acoustic wave and the received acoustic wave is used to judge the distance of the objects around the tower crane. After being calculated by the central host, the tower crane warning is realized by the speed of the sound frequency emitted by the alarm. A voice recording device such as an electric horn can also be installed in the cab to facilitate the driver to drive away the personnel in the hoisting operation range of the tower crane through voice.

[0024] In fields such as water conservancy and hydropower projects, there are visual blind areas around the tower crane chassis. During hoisting operations, the hoisting personnel do not have a clear understanding of the surrounding environment, posing a greater safety risk and greatly reducing the hoisting efficiency. Furthermore, it will cause slow hoisting operations, high risk factors, etc., and cannot guarantee the hoisting operation safety and project construction period.

[0025] In view of the construction problem of high risk in tower crane hoisting operations, the present utility model conducts systematic research through ideas such as theoretical analysis, risk assessment, and risk warning, and constructs a safety reminder device based on radar acoustic wave warning for hoisting operations, which can improve the construction level of engineering hoisting and ensure the safety of hoisting operation construction.

[0026] Among them, the heat treatment process principle of the safety reminder device for tower crane hoisting operations includes: radar acoustic wave emission and reception information processing principle, radar acoustic wave warning principle, and radar acoustic wave sensing principle.

[0027] (1) Radar acoustic wave emission and reception information processing principle

[0028] Currently, during tower crane hoisting operations, the hoisting personnel are not clear about the situation of other operating personnel at the bottom of the tower crane, and the judgment of the distance to surrounding buildings is inaccurate, with many visual blind areas, resulting in the need to equip 2 - 3 full-time hoisting safety officers at the bottom of the tower crane to observe and direct the operation on-site, seriously wasting human resources and causing low hoisting operation efficiency.

[0029] To solve the problem of difficult operations during tower crane hoisting operations, the present utility model provides a radar acoustic wave warning reminder device applied during tower crane hoisting operations. This reminder device can improve hoisting construction efficiency, save manpower, reduce the safety risk coefficient, save construction costs and construction period through the design of radar acoustic wave probes. Its specific principle is as Figure 2 shown.

[0030] (2) Radar acoustic wave warning principle

[0031] As Figure 3As shown in the figure, to ensure the safety and quality during the hoisting operation of the tower crane, a radar acoustic wave warning and reminder device is installed on the walking support of the tower crane chassis. The process of combining radar acoustic wave probes with a voice system is adopted to ensure on-site voice reminders within the warning range set by the radar (i.e., the hoisting operation range). The radar acoustic wave warning principle is as follows Figure 4 shown.

[0032] (3)Radar acoustic wave sensing principle

[0033] As Figure 5 shown, the ultrasonic sensor includes a metal shell 8, a conductive screw 9, a terminal piece 10, a piezoelectric wafer 11, a protective film 12, and an absorption block 13. It is manufactured based on some characteristics of ultrasonic waves and is used to complete the transmission and reception of ultrasonic waves. The internal piezoelectric wafer vibrates under the excitation of voltage to generate ultrasonic waves. Ultrasonic waves have a high frequency, short wavelength, good directivity, can propagate linearly, and have a good penetration effect on liquids or solids. For example, for some opaque objects, ultrasonic waves can penetrate dozens of meters. In addition, when encountering impurities and other objects, reflection will occur, resulting in an echo.

[0034] The ultrasonic sensor mainly consists of a transmitting part, a receiving part, a control part, and a power supply part.

[0035] Among them, the transmitting part consists of a transmitter and a transducer. The transducer can convert the energy generated when the piezoelectric wafer vibrates under voltage excitation into ultrasonic waves, and the transmitter emits the generated ultrasonic waves;

[0036] The receiving part consists of a transducer and an amplifier circuit. The transducer receives the reflected ultrasonic waves. Since mechanical vibration will occur when receiving ultrasonic waves, the transducer can convert mechanical energy into electrical energy, and then the amplifier circuit amplifies the generated electrical signal;

[0037] The control part is to control the entire working system. First, it controls the transmitter part to emit ultrasonic waves, then controls the receiver part to determine whether the received ultrasonic waves are the ones emitted by itself, and finally identifies the magnitude of the received ultrasonic waves;

[0038] The power supply part is the power supply device for the entire safety alarm device. Under the action of the power supply and under the control of the control part, the transmitter and the receiver cooperate with each other to complete the functions required by the sensor.

[0039] In a specific embodiment of the utility model, the transceiver sensor of the radar acoustic wave probe 1 is fixed on the metal inductor bracket of the tower crane chassis, at a position 1.5 m above the ground, and is installed simultaneously around the tower crane chassis. The transceiver sensor of the radar acoustic wave probe 1 is connected to the controller of the tower crane chassis. The other end of the controller 7 is connected to the voice broadcaster 5 and the operation warning light 3 through connections. The operation warning light 3 and the voice broadcaster 5 are connected to the alarm in the hoisting operation cab 2. When the tower crane starts hoisting operations, that is, after the hoisting switch 6 of the tower crane is turned on, the transceiver sensor of the radar acoustic wave probe 1 is powered on and operates. When there are moving objects (including people and objects) within 15 m of the bottom of the tower crane, the voice player 5 on the tower crane chassis will operate and play a preset warning voice to remind other operators around the tower crane that the tower crane is entering hoisting operations. When there are moving objects within 5 m of the bottom of the tower crane, the alarm 2 in the tower crane cab will sound an alarm to remind the hoisting operator to observe and take necessary braking measures. The hoisting operator can also use the voice recording device 4 set in the cab to remind the people staying at the bottom of the tower crane to leave through the voice broadcaster 5. Operation warning lights 3 are installed at both ends of the tower crane jib to prevent the possibility of collision between the two ends of the tower crane jib during hoisting. Operation warning lights 3 are set on each jacking mechanism of the tower crane to minimize the probability that other operators cannot see the warning lights due to the blocked view in the complex operation environment. The operation warning light 3 starts to be powered on and operates after the hoisting switch 6 of the tower crane is turned on and is in a luminous state. When the radar acoustic wave probe 1 detects a moving object, it generates a corresponding electrical signal and sends it to the controller 7. The controller 7 controls the alarm 5 to operate according to the electrical signal and controls the operation warning light 3 to flash to enhance the warning effect.

[0040] It should be noted that the alarm 2, the operation warning light 3 and the corresponding control methods are all mature existing technologies.

[0041] In summary, in the technical solution provided by the utility model, the warning light 3 can remind non-hoisting workers to stay away from the operation range of the tower crane. The radar acoustic wave probe 1 can detect people or objects in a moving state in the entire operation range of the tower crane in real time and remind the driver through the alarm 2, avoiding safety accidents caused by the driver's misjudgment due to poor vision, large blind areas, complex operation environments and operation conditions, reducing the incidence of safety accidents, and improving the safety of hoisting operations.

[0042] Furthermore, on the basis of achieving the above beneficial effects, each preferred solution has also achieved the following beneficial effects: Radar acoustic wave probes 1 are set around the tower crane chassis, which can realize the full-range detection of moving objects within the hoisting operation range, improve the detection coverage rate, and reduce the missed detection rate; the voice recording device 4 and the voice broadcaster 5 can further remind non-hoisting workers to stay away from the hoisting operation range and reduce the probability of safety accidents.

Claims

1. A safety alarm device for tower crane hoisting operation, characterized in that: It comprises a radar sound wave probe (1), an alarm (2), an operation warning light (3) and a controller (7); The radar sound wave probe (1) is arranged on the tower crane chassis, the alarm (2) is arranged on the tower crane cab, and a plurality of operation warning lights (3) are arranged on the tower crane's lifting mechanism, chassis and both ends of the boom respectively; The radar sonic probe (1), the alarm (2) and the operation warning light (3) are all connected to the controller (7); The radar acoustic wave probe (1) is used to generate an electrical signal and send it to the controller (7) when detecting the presence of a moving object within the tower crane hoisting operation range; The controller (7) is used to control the alarm (2) to emit an alarm signal and control the warning light (3) to flash after receiving the electrical signal.

2. A safety alarm device for tower crane hoisting operation according to claim 1, characterized in that: There are multiple radar sound wave probes (1), which are respectively arranged on the four sides of the tower crane chassis.

3. A safety alarm device for tower crane hoisting operation according to claim 1, characterized in that: It also includes a voice input device (4) and a voice announcer (5); The voice input device (4) is arranged in the cab; The voice announcer (5) is arranged on the tower crane chassis and is respectively connected to the controller (7) and the voice input device (4), and is used to play the preset warning voice and the voice input in real time by the driver through the voice input device (4).

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