Mixer truck blind area monitoring and safe operation alarm device

Abstract

The utility model relates to the technical field of mechanical engineering, in particular to a mixer truck blind area monitoring and safe operation alarm device, which comprises an audible and visual alarm and a mobile monitoring system, and is characterized in that the audible and visual alarm is mounted beside a co-driver door of a mixer truck; and the mobile monitoring system is mounted on crawling ladders on two sides of the tail of the mixer truck. The device can timely monitor whether a person moves in the view blind area of the mixer truck, so that a driver is timely reminded that the person passes through the blind area or climbs up the ladder stand to pay attention to driving safety, an operator who climbs up the ladder stand is timely reminded to take safety protection measures, workers can be prevented from adding water, water adding evidences of the workers can be recorded, and safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical engineering technical field, concretely relates to a blind area monitoring and safe operation alarm device of mixer truck in mechanical engineering technical field. BACKGROUND

[0002] Concrete is one of the most widely used building materials, and plays an irreplaceable important role in the construction industry. Among them, the application scene of commercial concrete is the most, from civil buildings, rural buildings, to railways, highways, bridges, tunnels and other urban infrastructure, concrete cannot be separated from the scene. Therefore, as a transport tool of commercial concrete, the concrete mixer truck often shuttles in every corner of the city. However, due to the long body and large body of the concrete mixer truck, the driver has many observation blind areas, and the ladder behind the concrete mixer truck is often climbed by workers. At this time, if the driver fails to start the vehicle in time, it may cause a major traffic accident. At the same time, workers often climb the ladder to add water to the mixing bin at the construction site, which affects the quality of concrete. SUMMARY

[0003] In order to solve the technical problems that in the prior art, when the ladder behind the mixer truck is climbed by workers, the driver fails to start the vehicle in time, which easily leads to a major traffic accident, and many construction sites have workers who climb the ladder to add water to the mixing bin, which affects the quality of concrete, the purpose of the utility model is to provide a blind area monitoring and safe operation alarm device of mixer truck, and the technical scheme is as follows:

[0004] The utility model embodiment provides a blind area monitoring and safe operation alarm device of mixer truck, and the device comprises: an audible and visual alarm and a mobile monitoring system, wherein:

[0005] The audible and visual alarm is installed on the side of the co-driver door of the mixer truck.

[0006] The mobile monitoring system is installed on the ladders on both sides of the tail of the mixer truck.

[0007] In some possible implementation manners, the audible and visual alarm comprises an indicator light, a first voice loudspeaker and a first human body sensing module, wherein:

[0008] The indicator light, the first voice loudspeaker and the first human body sensing module are respectively installed on the side of the co-driver door of the mixer truck through structural locks.

[0009] In some possible implementation manners, the mobile monitoring system comprises a second human body sensing module, a second voice loudspeaker, a central control processor and a monitoring device, wherein:

[0010] The second human body sensing module and the second voice speaker are installed on the girders on both sides of the rear of the mixer truck.

[0011] The central control processor is installed on the bottom of the girders.

[0012] The monitoring device is installed on the ladder.

[0013] In some possible implementation manners, the second human body sensing module is installed on the girders through a screw structure, and the second voice speaker is installed in the inner groove of the girders.

[0014] In some possible implementation manners, the central control processor comprises a printed circuit board, and a stainless steel shell is arranged on the outer surface of the printed circuit board.

[0015] In some possible implementation manners, a channel steel is welded on the ladder on both sides of the rear of the mixer truck, and the monitoring device is fixed on the channel steel through a screw locking mode.

[0016] In some possible implementation manners, the monitoring device comprises a camera, a motor, a chain, a sprocket, a bearing, a drag chain, a fixing frame, a protective cover, a moving frame, a limit sensor and a positioning rod.

[0017] The bearing is installed on four clamping grooves of the fixing frame, the sprocket is installed on the bearing on one side of the motor, the other side of the motor is connected with the positioning rod, the chain is installed on the sprocket to form a chain transmission structure, the camera is installed on the moving frame, the moving frame is welded on one section of the chain, so that the chain transmission can drive the moving frame to realize the left and right displacement of the camera, the drag chain is fixed in the fixing frame, the limit sensor is installed in the fixing frame, and the protective cover is installed above the fixing frame through a screw hole.

[0018] In some possible implementation manners, the second human body sensing module, the second voice speaker, the camera, the motor and the limit sensor are connected with the central control processor.

[0019] In some possible implementation manners, the camera comprises a distance pinhole network camera, a miniature network camera, a mini network camera or an anti-shake motion camera.

[0020] In some possible implementation manners, the first human body sensing module and the second human body sensing module comprise an infrared sensor, an ultrasonic sensor or a microwave radar sensor.

[0021] The utility model discloses a following beneficial effects: in the blind area monitoring and safe operation alarm device of mixer truck, set up audible -visual alarm and mobile monitoring system, through the installation of audible -visual alarm in the copilot door side of mixer truck, can monitor whether the person appears in the visual field range of the right front door of mixer truck through audible -visual alarm, and when sensing the personnel, carry out automatic starting audible -visual alarm. Moreover, through the installation of mobile monitoring system in the tail of mixer truck both sides ladder, can monitor whether the person moves in the visual field range of the rear both sides ladder of mixer truck, and when monitoring the personnel movement, carry out timely alarm. Moreover, the monitoring system can also send signal and start camera, thereby through the camera automatic tracking personnel action route and video content is transmitted to the video streaming media and cell -phone application program on cloud platform, for example, if personnel climbs the ladder top or the camera identifies the worker water adding action, then will alarm broadcast the voice content of prohibiting to add water to the mixing bin, simultaneously starts the video recording function automatic recording and saves in cloud space, and timely retains the water adding evidence of staff and can be extracted at any time. In this way, the monitoring system can timely monitor whether the person moves in the visual field blind area of mixer truck, thereby timely reminding the driver that someone passes through or climbs the ladder from the blind area, pays attention to the traffic safety, timely reminds the operating personnel on the ladder to do the safety protection measures, can also prevent the worker water adding and record the worker water adding evidence, improve the security. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme and advantages of the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled person in the art, other drawings can also be obtained according to these drawings without creative labor.

[0023] Figure 1 It is a kind of mixer truck blind area monitoring and safe operation alarm device's component structure schematic diagram provided by the utility model embodiment;

[0024] Figure 2 It is the component structure schematic diagram of audible -visual alarm provided by the utility model embodiment;

[0025] Figure 3 It is another component structure schematic diagram of a kind of mixer truck blind area monitoring and safe operation alarm device provided by the utility model embodiment;

[0026] Figure 4 It is still another component structure schematic diagram of a kind of mixer truck blind area monitoring and safe operation alarm device provided by the utility model embodiment;

[0027] Figure 5is another component structure schematic view of the blind area monitoring and safe operation alarm device of the mixing truck provided by the embodiment of the utility model;

[0028] Figure 6 is another component structure schematic view of the blind area monitoring and safe operation alarm device of the mixing truck provided by the embodiment of the utility model;

[0029] Figure 7 is another component structure schematic view of the blind area monitoring and safe operation alarm device of the mixing truck provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to further illustrate the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the specific implementation, structure, features and effects of the blind area monitoring and safe operation alarm device of the mixing truck according to the utility model are described in detail as follows by combining with the drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0031] In the description of the embodiments of the utility model, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text is only a description of the association relationship of the associated object, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B, and B alone. In addition, in the description of the embodiments of the utility model, "multiple" means two or more than two.

[0032] Hereinafter, the terms "first", "second" are only used for description purposes, and cannot be understood as implying or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the utility model belongs.

[0034] The specific scheme of the blind area monitoring and safe operation alarm device of the mixing truck provided by the utility model is described in detail below in combination with the drawings. Please refer to Figure 1 which shows the component structure schematic view of the blind area monitoring and safe operation alarm device of the mixing truck provided by one embodiment of the utility model, the device comprises: sound light alarm 101 and mobile monitoring system 102;Among them:

[0035] The sound and light alarm 101 is installed on the side of the co-driver door of the mixer truck.

[0036] Here, the sound and light alarm comprises an indicator light, a first voice speaker, and a first human body sensing module. The indicator light, the first voice speaker, and the first human body sensing module are respectively installed on the side of the co-driver door of the mixer truck by structural locking. The first human body sensing module adopts any one of an infrared sensor, an ultrasonic sensor, and a microwave radar sensor. Optionally, the detection range of the first human body sensing module is 0-2 meters. The voice content broadcasted by the first voice speaker can be customized according to the use scenario. Figure 2 As shown in the figure, the sound and light alarm 101 comprises an LED light 11, a voice speaker 12 (i.e. the first voice speaker), and a human body sensing module 13 (i.e. the first human body sensing module). The LED light 11, the voice speaker 12, and the human body sensing module 13 are directly locked on the side of the co-driver door of the mixer truck by screws during installation. In this way, the sound and light alarm is composed of the indicator light, the first voice speaker, and the first human body sensing module, and is installed on the side of the co-driver door of the mixer truck, so as to automatically monitor whether there is a person passing through the side field of view blind area of the mixer truck and start the sound and light alarm, so as to remind the driver and the person to pay attention to safety.

[0037] The mobile monitoring system 102 is installed on the ladders 7 on both sides of the tail of the mixer truck.

[0038] Here, the mobile monitoring system comprises a second human body sensing module, a second voice speaker, a central control processor, and a monitoring device. The second human body sensing module and the second voice speaker are installed on the girders on both sides of the tail of the mixer truck. The central control processor is installed at the bottom of the girders. The monitoring device is installed on the ladders. The second human body sensing module is installed on the girders by screw structure. The second voice speaker is installed in the inner groove of the girders. The central control processor comprises a printed circuit board (PCB), and a stainless steel shell is arranged on the outer surface of the PCB circuit board. The second human body sensing module adopts any one of an infrared sensor, an ultrasonic sensor, and a microwave radar sensor. Optionally, the detection range of the second human body sensing module is 0-2 meters. Figure 3 As shown in the figure, the mobile monitoring system 102 comprises a human body sensing module 2 (i.e. the second human body sensing module) and a voice speaker 3 (i.e. the second voice speaker) installed on the girders 8 on both sides of the tail, a central control processor 4 installed at the bottom 9 of the girders, and a monitoring device 5 installed on the ladders. The structure of the bottom 9 of the girders and the ladders 7 on both sides of the tail is as shown in the figure. Figure 4The human body sensing module 2 and the voice speaker 3 installed on the rear beam 8 are also screwed and locked on the beam 8 through punching, and the voice speaker 3 can be installed in the recess on the inner side of the beam to avoid damage caused by concrete overflow or cement splashing and setting. The central control processor 4 is a PCB circuit board protected by a stainless steel shell and installed below the rear beam 9 of the vehicle, so as to prevent damage caused by rainwater and cement splashing. In this way, the signal receiving end of the central control processor is connected with the signal output end of the second human body sensing module, and the second voice speaker and the monitoring device are controlled to operate after the central control processor receives the signal of the second human body sensing module, so as to automatically monitor whether there is a person on the climbing ladder of the rear part of the concrete mixer truck in the visual field blind area and start the sound and light alarm to remind the person to wear safety protection equipment and pay attention to work safety.

[0039] In the embodiment of the utility model, through setting sound and light alarm and mobile monitoring system in the mixer truck blind area monitoring and safety operation alarm device, and installing sound and light alarm on the co-driver door side of the mixer truck, whether there is a person in the visual field range of the right front door of the mixer truck can be monitored through the sound and light alarm, and when a person is sensed, the sound and light alarm is automatically started. Moreover, the mobile monitoring system is installed on the climbing ladders on both sides of the rear part of the mixer truck, whether there is a person moving in the visual field range of the climbing ladders on both sides of the rear part of the mixer truck can be monitored, and when a person is sensed, timely alarm is carried out, so as to timely remind the driver that a person passes from the blind area or climbs on the climbing ladder and pay attention to driving safety. Moreover, the monitoring system can also send a signal to start the camera, so that the camera automatically tracks the action route of the person and transmits the video content to the video streaming media and mobile application program through the cloud platform. If the person climbs on the top of the climbing ladder or the camera identifies the action of the worker adding water, the camera will alarm and broadcast the voice content of prohibiting adding water into the mixing bin, and simultaneously starts the video recording function and automatically records and saves in the cloud space, so as to timely keep the evidence of the worker adding water and can be extracted at any time. In this way, the monitoring system can timely monitor whether there is a person moving in the visual field blind area of the mixer truck, so as to timely remind the driver that a person passes from the blind area or climbs on the climbing ladder and pay attention to driving safety, timely remind the worker on the climbing ladder to take safety protection measures, and also can prevent the worker from adding water and record the evidence of the worker adding water, so as to improve safety.

[0040] In some possible implementation manners, after the installation of the monitoring device is completed, a channel steel is welded on the climbing ladders on both sides of the rear part of the mixer truck, and the monitoring device is fixed on the channel steel through screw locking. Figure 3 As shown in the figure, after the installation of the monitoring device 5 is completed, a channel steel is welded on each of the climbing ladders on both sides of the rear part of the mixer truck, and the monitoring device 5 is fixed on the channel steel through screw locking, so that the whole device can be disassembled when maintenance is needed.

[0041] In some embodiments, the monitoring device 5 includes: a camera, a motor, a chain, a sprocket, a bearing, a drag chain, a fixed frame, a protective cover, a mobile frame, a limit sensor, and a positioning rod; wherein:

[0042] The bearings are mounted on the four slots of the fixed frame; the sprocket is mounted on the bearing on one side of the motor, and the other side of the motor is connected to the positioning rod; the chain is mounted on the sprocket to form a chain drive structure; the camera is mounted on the movable frame, and the movable frame is welded to one section of the chain, so that when the chain is driven, it can drive the movable frame to achieve left and right displacement of the camera; the drag chain is fixed inside the fixed frame; the limit sensor is mounted inside the fixed frame; and the protective cover is mounted above the fixed frame through the screw hole. The camera is any one of a detachable pinhole webcam, a micro webcam, a mini webcam, and an anti-shake sports camera, preferably with a lens that can move 360 ​​degrees. Optionally, the motor can be any one of a servo motor, a stepper motor, a torque motor, a switched reluctance motor, and a brushless DC motor.

[0043] The indicator light and the second voice speaker are installed on the passenger door side and above the tail beam of the concrete mixer truck. The signal receiving end of the indicator light and the second voice speaker is connected to the signal output end of the central control processor. When the signal from the central control processor is received, the indicator light and the second voice speaker are started.

[0044] The camera's signal receiving terminal is connected to the central control processor's signal output terminal. When the central control processor receives a signal from either the first or second human sensing module, it activates the camera and motor. The camera automatically tracks human movement and adjusts the camera's angle. It can also be equipped with artificial intelligence recognition capabilities. When it detects a worker adding water to a hopper, it automatically starts recording and saves the action to the cloud. In this way, the camera automatically activates when the sensor detects a person climbing a ladder. If it detects a worker adding water, it automatically records and uploads the video to the cloud, alerting the driver. The video saved in the cloud can be accessed at any time.

[0045] like Figure 5 and Figure 6As shown, the monitoring device 5 comprises: a camera 51, a motor 52, a chain 53, a chain wheel 54, a bearing 55, a drag chain 56, a fixed frame 57, a protective cover 58, a moving frame 59, a limit sensor 510, a positioning rod 511; wherein: when installing the monitoring device 5, install four bearings 55 on the four clamping grooves of the fixed frame 57, pass the motor 52 through one side of the bearing, and install the chain wheel 54, connect the other side with a positioning rod 511, one end of which is installed on the chain wheel 54 and the other end is positioned by a bolt; install the chain 53 on the two chain wheels 54 to form a chain transmission structure, install the camera 51 on the moving frame 59, and weld the moving frame 59 to one section of the chain 53, so that the chain 53 can drive the moving frame 59 to realize the left and right displacement of the camera 51 when the chain 53 is driven (as shown in Figure 6 The drag chain 56 can be fixed inside the fixed frame 57 to protect the power line of the camera 51 and prevent it from being wound into the chain wheel during operation to cause damage to the equipment; the limit sensor 510 is installed inside the fixed frame 57, and when the moving frame 59 touches any side of the limit sensor 510, the motor 52 stops running, which can prevent the structure from being damaged due to the displacement of the moving frame 59 being too far. As shown in Figure 7 The protective cover 58 is installed above the fixed frame 57 through screw holes to protect the chain 53, chain wheel 54 and other structures from being contaminated by concrete and causing structural damage.

[0046] When the vehicle starts, the installed equipment is powered on, and the human body sensing module 13 on the sound and light alarm 1 and the human body sensing module 2 on the girder start to detect whether there is living body within a radius of 2 meters. As shown in Figure 2 The human body sensing module 13 on the sound and light alarm 1 directly controls the power supply of the LED lamp 11 and the voice horn 12, and when personnel appear within the detection range of the human body sensing module 13, the switch is actuated to start the LED lamp 11 and the voice horn 12 to remind personnel to pay attention to safety.

[0047] As shown in Figure 3As shown, the rear human body induction module 2, voice speaker 3, camera 51, motor 52 and limit sensor 510 are directly connected with the central control processor 4. When a person appears in the detection range of the human body induction module 2, a signal is transmitted to the central control processor 4, which then transmits the signal to the voice speaker 3 to issue a specified voice content to remind the worker to pay attention to work safety and prohibit adding water into the mixing drum, and simultaneously starts to control the motor 52 to control the forward and reverse rotation of the motor 52. At this time, if the left human body induction module 2 detects that a person appears, the camera 51 is controlled to start and open the automatic recording function, and the motor 52 is controlled to rotate forward. At this time, the chain wheel 54 drives the chain 53 and the moving frame 59 fixed on the chain to move to the right, and the camera 51 installed on the moving frame 59 also moves. When the moving frame 59 moves to the right limit sensor 510, a signal is transmitted back to the central control processor 4, and the motor 52 stops running. At the same time, the lens of the camera 51 can automatically adjust the lens angle according to the action of the person. When the person leaves the monitoring range of the human body induction module 2, the camera 51 stops recording function and uploads the video to the streaming media server through the central control processor 4, and saves it in the server cloud which can be accessed at any time. At the same time, the voice speaker 3 stops working, and the camera 51 enters the dormant state. When the right human body induction module 2 detects that a person appears, the motor 51 is controlled to reverse, and the rest of the equipment works as described above.

[0048] In the embodiment of the utility model, the device installed on the vehicle co-driver room door can emit signals to monitor the range of 2 meters from the vehicle body radius, if the vehicle is in the running state and there is a person in the range, the human body induction sensor can sense the person and automatically start the sound and light alarm, through the flash and voice broadcast warning personnel away from the vehicle, pay attention to safety. The device installed on the vehicle rear two sides ladder can emit signals to monitor whether there is a person in the range of 2 meters, if the vehicle is in the running state and there is a person in the range, the human body induction sensor can sense and start the sound and light alarm, through the flash and voice broadcast warning personnel to pay attention to the safety of operation, remind to take safety protection measures, such as wearing a safety helmet, hanging a safety rope, etc., at the same time, the signal is sent to start the camera, the camera can automatically track the personnel action route and transmit the video content to the video streaming media and mobile phone APP through the cloud platform, if the personnel climbs on the top of the ladder or the camera identifies the worker's water adding action, the voice content of prohibiting adding water into the mixing bin is broadcasted, at the same time, the video recording function is started and saved in the cloud space, the worker's water adding evidence is timely retained and can be extracted at any time. In this way, the mixing truck blind area monitoring and safe operation alarm device provided by the embodiment of the utility model can remind the driver that someone passes through or climbs on the ladder from the blind area, pay attention to driving safety; can automatically detect whether there is a worker on the mixing truck ladder, timely remind the worker on the ladder to take safety protection measures and pay attention to the safety of operation, and also timely remind to prevent the worker from adding water, and automatically identify the worker's water adding action and record the video to keep evidence.

[0049] In addition, the embodiment of the utility model also protects a system, which can include a plurality of processing modules, when the system is applied to a device, the processing module can be used for controlling and managing the action of the device. The storage module can be used to support the device to execute mutual program code, etc. Among them, the processing module can be a processor or a controller, which can realize or execute various exemplary logic blocks, modules and circuits described in combination with the disclosure of the utility model. The processor can also be a combination of computing functions, such as including one or more microprocessor combinations, digital signal processing (Digital Signal Processing, DSP) and microprocessor combinations, etc., and the storage module can be a memory.

[0050] In addition, the system provided by the embodiment of the utility model can be a chip, an assembly or a module, the chip can include a connected processor and a memory; wherein the memory is used to store instructions, when the processor calls and executes the instructions, the chip can control the mixing truck blind area monitoring and safe operation alarm device in the above-mentioned embodiment.

[0051] The system, computer readable storage medium, computer program product or chip provided by the embodiment are used for executing the corresponding method provided above, and therefore the beneficial effects that can be achieved are referable to the beneficial effects of the corresponding method provided above, which will not be described herein again. Through the description of the above embodiments, those skilled in the art can understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the system is divided into different functional modules to complete all or part of the functions described above. In the embodiments provided by the present application, it should be understood that the disclosed system and method can be implemented by other ways. For example, the system embodiments described above are merely schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be through some interface, indirect coupling or communication connection between the system or unit, which can be electrical, mechanical or other forms.

[0052] It should be noted that: the above-mentioned embodiment of the present application is only for description, and does not represent the advantages and disadvantages of the embodiment. The process depicted in the drawing does not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multiple task processing and parallel processing are also possible or may be advantageous. Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments. The above content is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

[0053] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above-mentioned embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A mixer truck blind spot monitoring and safe operation alert device, characterized in that, The device comprises an audible and visual alarm and a mobile monitoring system, wherein: The audible and visual alarm is installed on the side of the co-driver door of the mixer truck; The mobile monitoring system is installed on the ladders on both sides of the rear of the mixer truck.

2. The blind area monitoring and safe operation alert device for a mixer truck of claim 1, wherein, The audible and visual alarm comprises an indicator light, a first voice speaker and a first human body sensing module, wherein: The indicator light, the first voice speaker and the first human body sensing module are respectively installed on the side of the co-driver door of the mixer truck through structural locking.

3. The blind area monitoring and safe operation alert device for a mixer truck of claim 1, wherein, The mobile monitoring system comprises a second human body sensing module, a second voice speaker, a central control processor and a monitoring device, wherein: The second human body sensing module and the second voice speaker are installed on the girders on both sides of the rear of the mixer truck; The central control processor is installed at the bottom of the girders; The monitoring device is installed on the ladders.

4. The blind area monitoring and safe operation alert device for a mixer truck of claim 3, wherein, The second human body sensing module is installed on the girders through screw structure; the second voice speaker is installed on the inner groove of the girders.

5. The blind area monitoring and safe operation alert device for a mixer truck of claim 3, wherein, The central control processor comprises a printed circuit board, and a stainless steel shell is arranged on the outer surface of the printed circuit board.

6. The blind area monitoring and safe operation alert device for a mixer truck of claim 3, wherein, A channel steel is welded on the ladders on both sides of the rear of the mixer truck, and the monitoring device is fixed on the channel steel through screw locking.

7. The blind area monitoring and safe operation alert device for a mixer truck of claim 3, wherein, The monitoring device comprises a camera, a motor, a chain, a sprocket, a bearing, a drag chain, a fixing frame, a protective cover, a moving frame, a limit sensor and a positioning rod, wherein: The bearing is installed on four clamping grooves of the fixing frame; the sprocket is installed on the bearing on one side of the motor, and the other side of the motor is connected with the positioning rod; the chain is installed on the sprocket to form a chain transmission structure; the camera is installed on the moving frame, and the moving frame is welded on one section of the chain, so that the chain transmission can drive the moving frame to realize the left and right displacement of the camera; the drag chain is fixed in the fixing frame; the limit sensor is installed in the fixing frame; and the protective cover is installed above the fixing frame through a screw hole.

8. The blind area monitoring and safe operation alert device for a mixer truck of claim 7, wherein, The second human body sensing module, the second voice speaker, the camera, the motor and the limit sensor are connected with the central control processor.

9. The blind area monitoring and safe operation alert device for a mixer truck of claim 7, wherein, The camera comprises a network camera with a distance needle hole, a micro network camera, a mini network camera or an anti-shake motion camera.

10. The blind area monitoring and safe operation alert device for a mixer truck of claim 3, wherein, The first and second human body sensing modules comprise an infrared sensor, an ultrasonic sensor or a microwave radar sensor.

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