KR100714730B1 - Multiple safety control system of aerial work vehicle - Google Patents

Abstract

According to the present invention, when an operator rides on a work platform of an aerial work vehicle, an error occurs in an automatic moment limiter for regulating the boom extension and ups and downs of the aerial work vehicle, or the flow control electronics controlling the boom operation. When the spool of the proportional valve is contaminated and malfunctions, the boom is excessively drawn out of the working range diagram, or the boom is damaged and the equipment overturns due to the increase of the moment of the boom due to the overload of the work platform. It is equipped with a function to automatically limit the maximum range of work to limit the number of times, and to detect the overload, vibration, and impact on the workbench to prevent the safety accident of the worker due to the equipment overturning.

In addition, a recording device for recording the operating state and abnormal operation state of the equipment is provided in the upper and lower control boxes of the equipment for the safety management of workers working in the shipbuilding, marine, construction and civil engineering and efficient maintenance of the equipment, The present invention relates to a multiple safety control device and system for an aerial vehicle having an output device capable of periodically retrieving the contents of a record.

Automatic moment limiter (AML), multiple safety control device, length sensor, angle sensor, load sensor, acceleration sensor, overload detection, impact amount detection, driving recorder

Description

Multiplex safety control system for aerial work platform

1 is a block diagram of a safety control system of a aerial vehicle according to the prior art.

Figure 2 (a) is a multi-task range diagram of the safety control system according to the prior art, in FIG.

Figure 2 (b) is a configuration diagram of the overload detection apparatus of the work table according to the prior art in FIG.

Figure 3 is a block diagram of a multiple safety control system of aerial work vehicle according to the present invention.

Figure 3 (a) is a detailed configuration diagram of the overload detection apparatus of the work table according to the present invention in FIG.

Figure 3 (b) is a detailed configuration of the safety control device according to the present invention in Figure 3;

Figure 3 (c) is a multiple working range diagram of the safety control system according to the present invention in Figure 3;

4 is a side view of an aerial vehicle showing one embodiment of a multiple safety control system in accordance with the present invention.

Figure 5 is a side view of a workbench showing an embodiment of a load sensor of the overload protection device according to the present invention.

The present invention is to make the expansion and contraction of the length by the sliding (Sliding) system between a plurality of booms (7, Boom) overlap each other according to its own characteristics in aerial work vehicle, equipped with a relief cylinder 80 at the bottom of the boom By making the inclination angle of the boom to be made, it is possible to adjust the position and height of the worktable 1 is fixed to the end portion 82 of the boom.

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings, and the same reference numerals are given to the same parts as in the prior art.

  According to the present invention, in the aerial work vehicle provided with the work table 1 at the tip of the telescopic boom, the boom length sensor 5 for measuring the drawing distance of the telescopic boom, the angle sensor 6 for measuring the inclination angle of the boom, The data of the instrument by kinematic analysis in the microcomputer of the automatic moment limiting device 8 with reference to the data by the weight sensor 3 for measuring the load mounted on the work table 1 and the axle extension signal 9 installed on the axle. Calculate the moment and use it to determine a safe primary working range diagram (16, 17) and set a secondary working range diagram in a conventional safety control system, characterized in that it automatically limits the inclination angle and drawout distance of the telescopic boom. The present invention relates to a multiple safety control system for an aerial work vehicle, which is capable of performing a safer aerial work (high altitude work) by additionally installing a secondary safety control device for monitoring an abnormal state of the safety control system.

 The prior art of Fig. 1 is a flow rate that causes an abnormality in the automatic moment limiting device 8 that regulates the boom extension and ups and downs or when the worker rides on the work platform 1 of the aerial work vehicle, or controls the boom operation. When the control electromagnetic proportional valve 14 is contaminated by hydraulic fluid and becomes inoperable or malfunctions, the boom 7 is excessively drawn out of the safe working range diagram 16 and installed at the tip of the telescopic boom. The increase in the moment of the boom caused by the load of the work table 1 caused the boom 7 to break down and the equipment to be rolled over (conduction).

In addition, in order to solve the above problems, a micro switch 10 is installed at the rear end of the boom 7 to separate the work area according to the inclination angle of the boom 7 by using an installation member, and the extraction degree of the boom is detected. Automatic moment limiter (8) of the aerial work vehicle, characterized in that the proximity sensor 11 is installed on the boom to prohibit the operation in the direction of increasing the working radius. In the work scope diagram disclosed in (a), the work regulation diagram 17 is modified into the first regulation scope diagram 16 of the design reference value, and the second regulation scope diagram 15 is the first regulation scope diagram of the design reference value. Areas exceeding (16) occur, and some areas have the contradictions and disadvantages of narrowing the work area rather than the first regulatory range of design criteria. In addition, the pre-inspection of the equipment before the operation is possible, it is particularly disadvantageous that the display means for determining the presence or absence of the equipment in the field or the state of the equipment to record the driving record data on a regular basis is not provided.

In an aerial work vehicle, an overload detection device (2) is installed because the load on the work platform (1) is excessive in relation to the working range because the equipment may be overturned. Japanese Laid-Open Patent Publication No. 2003-34498 (Domestic Application No .: 10-2003-7001019) discloses a base of a workbench in which the workbench is mounted at least by the bracket in a high-altitude work vehicle formed by mounting a workbench through a bracket at the tip of a telescopic boom. A load sensor, which is supported by at least one support part and attached to the plate-shaped body of two or more support parts, is formed of a strain gauge for detecting the amount of warpage, and the output signals of these load sensors 18 are added to load the work bench. The configuration to detect is disclosed.

Comparing means 21 for comparing the load detection value and the overload set value based on the detection signal of the load sensor 18 with alarm means 22, 23 for generating an alarm when an overload is detected by the comparing means. There is an overload detection device characterized in that. In the case of using the plurality of load sensors 18, even one load sensor (strain gauge) cannot detect a normal load at breakage. The above-described overload detection method forms a rather complicated system and frequently suffers from chipping and chipping of the work place in the plate-shaped body of the support in a poor environment, and thus does not function properly and has a high failure rate. In addition, when working in a noisy workplace, the overload alarm sound (23) alone does not guarantee the safety of the worker, and there is a disadvantage in that there is no means for checking and providing the worker's load from time to time in advance before work and during work. .

The present invention has been made as shown in Figure 3 to solve the above problems, the multi-safety control system according to the present invention has a variety of circuits to perform the function of the conventional automatic moment limiting device 8, and further Furnace safety control device 42 is installed to provide a function to safely expand the multi-working range diagram of the equipment as shown in Figure 3 (c).

 In addition, when an abnormality occurs in the automatic moment limiting device 8 that regulates the boom extension and ups and downs of the aerial work vehicle, or when the spool of the flow control electromagnetic proportional valve 14 that controls the boom operation is contaminated and causes a malfunction, The main hydraulic source connected to the electromagnetic proportional valve 14 for flow control in order to fundamentally block the abnormal operation of the boom by detecting the safety control device 42 when the overload restriction signal 29 is generated by the anti-overload device 33. In controlling the main cut-off valve 13 to block (12).

In addition, the safety control device 42 and the overload prevention device 33 by position information of the length sensor (5), position information of the inclination angle sensor (6), which plays an important role in the operation of the equipment by the weight sensor (3) Provides digital display to enable the operator to check the load information of the work table and the impact amount of the work table by the acceleration sensor 70 before or during the work, and provides the function of the driving recorder to record the operation status of the equipment based on the reference time. The present invention relates to a multiple safety control system in a aerial work vehicle having a feature.

Aerial work truck is a self-propelled chassis 90, which is a large-class truck, a swing bearing mounted on the self-propelled chassis, and supports a rotation. (100), multi-stage boom and boom take-out cylinder (not shown), boom lift cylinder (80) for the vertical, horizontal rise to the working position to the work table (1) to maintain the horizontal of the work table (1) It consists of a horizontal holding cylinder 102, a gear post 95, a gear frame 97 and a work table (1), which is a post-rotation device for rotation (swing) of the work table (1).
Multiple safety control system according to Figure 4 is the upper control box (25, 93), overload protection device 33, weight sensor (3, pin-type load cell), boom length sensor (5, 81), boom angle sensor (6) It is characterized in that the lower control box 92 is composed of a double automatic moment limiting device composed of various circuits and the like including the functions of the safety control device 42 and the conventional automatic moment limiting device (8).

Multiple safety control system according to Figure 4 is the upper control box (25, 93), overload protection device 33, weight sensor (3, pin-type load cell), boom length sensor (5, 81), boom angle sensor (6) It is characterized in that the lower control box 92 is composed of a double automatic moment limiting device composed of various circuits and the like including the functions of the safety control device 42 and the conventional automatic moment limiting device (8).

 The operation of the equipment is an operator operating the equipment for maintenance or near-field movement at the bottom, and can operate the equipment using the lower selection mode in the lower control panel 38, and is provided with a functional switch not shown in the present invention. .

In addition, in order to perform the normal aerial work, the operator switches the work mode to the upper selection mode on the lower control panel 38 before boarding the workbench, and after boarding the workbench, the upper footrest switch 27 provided on the workbench 1. At this time, the main power is supplied to the upper control panels (23, 93) and the upper work is possible. Upper control panels (25, 93) is composed of an operation switch (not shown in this figure) and a joystick that is responsible for boom ups and downs, expansion, rotation, worktable rotation, and the like.

 The weight sensor 3, which forms part of the overload prevention device 33, is a sensor using a single pin-type load cell, and the gear post 95 is placed at the tip of the boom so as to sense the moment amount (weight) of the work table in FIG. A first connection frame 97 (gear frame) having a first connection hole and a second connection hole in the gear frame 97 and a first connection frame formed on one side of the work bench (basket) and having first connection holes and second connection holes. A connecting pin 98 inserted into the first connecting hole of the second connecting frame 96 and the first and second connecting frames 97 and 96, and connecting the first and second connecting frames to the first and second connecting frames; The load detection device for the basket (workbench) of the aerial platform, which is inserted into the second connecting hole of the connecting frame 2 and connected to the pin-shaped load cell 3 sensing the weight of the workbench, was carried out in one embodiment.

 Alternatively, the same moment concept may be applied to the rear end of the multi-stage boom, and the pin-shaped load cell 103 for fixing the rod of the horizontal holding cylinder 102 of the worktable 1 supported by the gear post 95 and the boom bow cylinder 80 A device that detects the overload or overload of the overall multi-stage boom by using the moment generated at the end of the workbench (indicated differently as bucket, basket, etc.) by inserting the pin type load cell 101 at the end of the rod) An example of carrying out was carried out in another example.

 In another embodiment, a first connection frame and a first connection frame are formed on one side of the workbench and the first connection frame is formed on the front end of the boom (one side of the gear frame) in a connector manner and includes first and second connection holes. Inserted into the second connection frame and the first and second connection holes of the first and second connection frame and the two connecting pins and the first and second connection construction of the first and second connection frame An example of installing an S-type load cell using a ball-type sensing member to sense the weight of a work table in the third connection hole was performed as another example.

Figure 3 (a) is a circuit block diagram showing an embodiment of the overload prevention apparatus 33 of the aerial work vehicle according to the present invention.

The fine differential signal source output from the weight sensor 3 (load cell) is applied via the line filter 63 and the common filter 64 and is applied to the first amplifier stage.

The first amplifier stage 65 adds the application signal of the zero point regulator 68 to the output signal and then applies it to the input of one end of the second amplifier 66, while the other end of the input of the second amplifier 66 Applying an output signal of the second amplifier stage 66 to the microcomputer 72 and an amplifier 69 having an amplifier 69 for applying an offset signal and means for varying the gain to amplify a signal corresponding to the actual weight And a buffer stage 67 for transmitting the weight signal to the external device.

In addition, the signal output of the acceleration sensor 70 for calculating the vibration and impact amount of the work table is output as a sine wave in accordance with the strength of the vibration / impact, and after averaging the maximum peak value in the signal amplifier stage 71 or removing high frequency noise, the microcomputer And a software timer setting (32.7ms) for digitally quantifying the load information, vibration / shock amount, so that the operator can visually recognize the operation through arithmetic processing, and when the buzzer is in operation Secondary filter for reading the sensor value, data application according to the change width of the signal applied from the sensors (3, 70), and a program routine for determining the warning, regulatory signal based on the filtered data Then, a load / shock amount digital display unit 73 having a multi-stage filter function for displaying the actual physical quantity to the operator by a segment indicator or a liquid crystal display is configured.

In addition, the serial communication unit 75 in charge of communication between the safety control device 42 and the overload protection device for system expansion, and also a means for providing a reference time to record the overload / over-shock state of the workbench in real time A clock unit 76, a driving record processor 77 for recording overload and impact amount data of a workbench; a printer and PC communication unit 78 capable of regularly extracting driving record data; and an overload and overshock of a workbench; To determine the boom extension status and the maximum frequency of the boom and to output the overload regulation signal immediately when an overload is detected, to prevent the boom from vibrating violently due to the pulsation caused by the hydraulic system of the equipment and to provide the operator with a sense of stability. In order to properly limit the overload control signal 29 according to the equipment or to apply the time delay (for several seconds) in order to determine the lower limit and the upper limit of the load. And an output signal processor 79 for generating an error message, an alarm sound, or the like after the set time has elapsed.

 One terminal of the internal potentiometer of the boom length sensor 5 is electrically grounded to the end 94 of the boom via the cord reel 81, and the other two terminals (power and signal lines) not shown in FIG. Wiring is connected to the sensor signal processing module 44.

 This is because the sensor signal processing module 44 and the boom length sensor 5 (potentiometer) recognize the reference potential (zero potential) of the sensor signal electrically by the body structure of the aerial work vehicle. When the code reel line 81 is drawn in or the reference potential due to disconnection in the drawing is floated, the boom length sensor 5 can be accurately detected.

  Here, the sensor signal processing module 44 includes the conventional automatic moment limiting device 8 and the safety control device 42 together with the boom length sensor 5 and the boom angle sensor 6 when constructing a multiple safety control system. The signals are amplified and buffered to share the electrical signals with each other, and the signals are transmitted to the respective controllers 42 and 8.

The automatic moment limiting device 8 uses a boom and a workbench, which is a working device of the aerial vehicle, by means of various control joysticks and function switches not shown in the upper control panel 25 and the lower control panel 38, which are briefly shown in FIG. Move to the desired position within the primary work envelope.

The work mode is divided into the upper mode and the lower mode, and the upper mode is usually operated by the operator using the joystick on the upper control panel 25 or by using a function switch in order to perform the aerial work on the work bench (1). This mode is to operate engine and workbench.

The lower mode mainly selects the lower part from the lower control panel 38 when the equipment is in service or when the upper mode is difficult to operate and operates various boom control functions to operate the boom and the workbench of the equipment.

In addition, in the above working mode, the loading load, the boom up and down angle, the boom take-off distance, and the axle extension signal are referred to, and the maximum overturning moment of the work platform is calculated by kinematics. Determine the area and regulate the safe working range by appropriately controlling the flow control valve 14 (boom extension, boom ups and downs, boom turning) for boom operation.When the load rate (moment) exceeds 100%, The boom down is regulated, and the boom can be pulled in and raised to automatically secure the safe working area of the equipment, thus protecting the safety and life of the aerial workers.

In addition, according to the load ratio (95% ~ 99%), as well as actuating the primary alarm with a warning buzzer or siren, the operator can manually stop the equipment through the warning sound.

 The first working range diagram is divided into two regions by the axle extension signal 9, and when the axle is extended, it is set to the maximum at line 60 of FIG. 3 (c), and when the axle is contracted, 62 of FIG. It is set to the minimum with line 1.

  The safety control device 42 is installed around the automatic moment limiting device 8 in the lower control box 92 of the aerial work vehicle of FIG. 4 and the boom length sensor 5 through the sensor signal processing module 44. It is designed to electrically share the signal of the boom angle sensor 6 with the automatic moment limiting device 8.

 In Fig. 3, the overload control release signal 28 of the horn / overload control release switch 26 which forms part of the upper control panel 25 and the overload control signal 29 output from the overload prevention device 33. ) Generates a boom control signal 31 by the electric OR coupling and is applied to the safety control device 42.

 Although not shown in detail in FIG. 3, the upper control panel 25 has an ON signal and a lower control panel 38 of the upper scaffold switch 27 for determining the application of main power to various control joysticks and function switches for operating the aerial work vehicle. The lower selection signal of the upper / lower selection switch 39 forming part of the output signal through the lower operation switch 40 and the output signal of the lower emergency pump switch 41 are mutually ORed to release the boom signal. 30 is generated and applied to the safety control device 42 together with the boom control signal 31. The safety control device 42, which receives the boom length and the boom angle signal from the sensor signal processing module 44 and receives the axle state from the axle extension signal 9, secures the primary working range of the equipment and the work table. After determining the load and the like comprehensively, the main cutoff valve 13 is opened to enable the boom operation.

  In the normal state, the safety control device 42 outputs a signal output from the sensor signal processing module 44 while performing the function whether the automatic moment limiting device 8 is in charge according to the working mode, whether at the top or the bottom. b) the length / angle sensor signal processing unit 51 is input to the microcomputer 54 and then processed to convert the physical quantity so that the operator can continuously check the boom length / angle in the middle of the length / angle digital display unit ( 50) and display the sensor error information in the form of an error code on the length / angle digital display unit 50 by analyzing the sensor signal for abnormality, analyzing the lower and upper limits of the sensor signal in real time. The output signal processor 52 generates an alarm sound.

  In addition, the safety control device 42 recognizes the information input from the boom sensors (5, 6) and the axle extension signal (9) through the input signal processing unit 57, the current position of the boom is the primary work range It is determined in real time whether the inside of the diagram (60, 62) or close to the second working range diagram (59, 61) in real time, and when the first working range diagram is exceeded, the output signal processing section 52 of FIG. The primary alarm sound (interruption sound) is generated by the alarm buzzer 53 installed in the safety control device 42 through).

When the primary work range is exceeded, an abnormality occurs in the automatic moment limiting device 8, or when the spool of the boom control flow control valve 14 is contaminated to cause a malfunction. When the difference between the work ranges 59 and 61 is exceeded, the safety control device 42 turns off the applied power of the main cutoff valve 13 to cut off the supply of the main hydraulic pressure source 12, thereby causing abnormal operation of the boom. It is possible to prevent overturning of the equipment in advance and to guarantee the safety and life of the worker.

When the secondary work range diagrams 59 and 61 are exceeded, the alarm sound of the safety control device 42 is switched to a continuous sound and continues to operate until the abnormal state of the equipment is resolved.

The secondary working range diagram is divided into two areas by the axle extension signal 9, and when the axle is expanded, the maximum area is set as line 59 of FIG. 3 (c), and when the axle is contracted, as shown in FIG. Line 61 sets the minimum area.

 The method of setting the secondary work range diagram is a sensor alignment monitor program using the first work range diagram of the automatic moment limiting device 8 of the aerial work vehicle using the position information of each sensor. After securing the second working range diagram from the outside trajectory of the first working range diagram according to the boom angle using a sensor alignment program in the field, the safety control device (automatic (basic pattern data) or manual operation) 42 through the PC communication processing unit 58.

 The length / angle sensor signal processing unit 51 first removes the high frequency noise of the sensor signal according to the strength and weakness of the vibration generated when the boom is applied, and then applies it to the microcomputer 54, and the operator recognizes the human eye through arithmetic processing. Software timer setting for proper digital digitization of boom length and boom angle, reading of sensor values when the buzzer is in operation and not in operation, and signals applied from the boom sensors (5, 6) Secondary filter is applied to apply data according to the rate of change, and software filter function is used to determine warning and boom control signal based on the filtered data. In addition to the boom length / angle digital display 50 to display the display, and in real time to check the abnormality of the boom sensor through a warning sound Be so.

 In addition, a serial communication processing unit 55 for communication between the overload prevention device 33 and the safety control device 42 for system expansion, an external communication port 43, and a communication line 32 are provided.

Then, the real time clock unit 53 and the driving record processor 56 for recording data of the boom sensors 5 and 6 as a means for providing a reference time for recording the abnormal operation state of the boom sensors 5 and 6. And the lower limit value and the upper limit value of the printer and PC communication unit 58 and the boom sensors 5 and 6 that can periodically extract the driving record data, and display the error information and generate an alarm sound after the set time has elapsed. The safety control device 42 in an aerial work vehicle having an output signal processing unit 52 or the like.

As described above, the present invention may be a plurality of embodiments according to the present invention with reference to the accompanying drawings as a multi-safety control system of the aerial vehicle, the above-described embodiment will be described with respect to the embodiment of the aerial vehicle However, the scope of the present invention is not limited to the above, and may be applied to all automatic moment limiters used in an electric motor boat and a hydraulic crane vehicle.

In addition, it should be understood that modifications, changes, additions to the present invention also fall within the scope of the present invention without departing substantially from the basic spirit of the invention described in the claims.

According to the present invention, when an abnormality occurs in the automatic moment limiting device, which is a conventional safety control device, or when a malfunction occurs due to contamination of the electromagnetic proportional valve for controlling the boom, the boom is excessively drawn out of the working range. As a result, the boom's momentum increased due to the overload of the workbench. In addition, due to the lack of means for regular inspection and equipment management, labor cost increases due to the decrease in work efficiency of frontline equipment managers, and safety management of field workers has always been a problem.

In order to solve the above problems, the work range of the aerial work vehicle is limited to a double, and the overload, vibration, and impact amount applied to the work bench are sensed to improve the driving habits of the worker and prevent the equipment overturning and damage in advance.

In addition, for the safety management of workers working in the field of shipbuilding, offshore and civil engineering, and the efficient maintenance of equipment, the upper and lower control devices of the equipment are equipped with recording devices and alarm means for recording the operation status and abnormal operation status of the equipment. It can be checked during inspection and work, and it is equipped with an output device that can pull out the contents regularly, so that the safety management of the equipment can be systematically managed to significantly reduce the damage and safety accident of the equipment.

Claims (10)

In order to control the electronic proportional valve 14 for controlling the boom for adjusting the position of the work platform 1 of the aerial work vehicle, the sensor signal is controlled through a normal automatic moment limiting device 8 and a sensor signal processing module 44. , A microcomputer and a peripheral control device, and a safety control device 42 for monitoring, alarming, and limiting the safe working range diagram of the equipment, and information necessary for the operator by detecting an overload, vibration, and impact amount of the workbench. In the multiple safety control system of the aerial platform composed of at least two of the overload protection device 33 having a display, an alarm, and a work limiting function, the horn / The overload control release signal 28 of the overload release switch 26 and the overload control signal 29 output from the overload prevention device 33 generate the boom control signal 31 by the electrical OR coupling. For various control of the control panel 25 A signal output through the lower operation switch 40 from the ON signal of the upper foot switch 27 to determine the main power supply to the twill switch and the lower select signal of the upper / lower select switch 39 on the lower control panel 38. The output signals of the lower emergency pump switch 41 and the output signal of the boom release signal 30 are electrically applied to the safety control device 42 together with the boom control signal 31 by the OR coupling. 42 receives the boom length and boom angle signal from the sensor signal processing module 44, recognizes the full width of the vehicle from the axle extension signal 9, and calculates the load and impact amount from the overload prevention device 33. After determining the safe primary working range diagram of the equipment, the main cutoff valve 13 is operated so that the multistage boom 7 can be operated. Under the above operation, the normal cut-off valve 13 is operated automatically according to the working mode (upper mode or lower mode). It includes the functions that the moment limiting device (8) is responsible for. Multiple safety control system of aerial work vehicle, characterized in that the first and second working range diagram to safely limit or control. The automatic moment limiter (8) is responsible for performing the area setting, monitoring, and regulating functions of the primary work range diagram (primary safety work area). Multi-safety control system of the aerial vehicle, characterized in that the safety control unit 42 is responsible for performing the area setting, monitoring, work restriction or blocking function for. The method of claim 1, wherein the safety control device 42 has a first working range diagram of the same type as the first working range diagram set by the automatic moment limiting device 8 in order to have a multiple working range diagram. Multiple safety control system for aerial work vehicle, characterized in that uniformly set at a constant distance from the outer trajectory of the range diagram. The safety control device 42 according to any one of claims 1 to 3, wherein the safety control device 42 checks the actual physical quantity so that an operator can continuously check information about the boom length sensor, the boom angle sensor, and other sensors before or during the work. Multi-safety control system of the aerial vehicle, characterized in that not only to display on the digital display 50 or the liquid crystal display, but also to check and confirm in real time on the spot whether the boom sensor abnormality. .   The real time clock unit 53 and the boom sensor according to any one of claims 1 to 3, wherein the real time clock unit 53 and the boom sensor are provided as a means for providing a reference time for recording an abnormal operation state of the boom length / angle sensors 5 and 6. 5 and 6, the driving record processing unit 56 for recording data, the printer and PC communication unit 58 capable of periodically extracting driving record data, and the lower and upper limit values of the boom sensors 5 and 6 are judged. And an output signal processor (52) for displaying an error information and generating an alarm sound after a set time has elapsed. The weight sensor (3) according to any one of claims 1 to 3, wherein the weight sensor (3) is a sensor using a single pin-shaped load cell to form a gear post (95) at the tip of the boom so as to detect the load of the work platform of the aerial work vehicle. And formed on one side of the first connecting frame 97 (gear frame) having the first and second connecting holes in the gear frame 97 and the work table (basket). Inserted into the second connecting frame 96 having the first and second connecting holes and the first connecting holes of the first and second connecting frames 97 and 96 to interconnect the first and second connecting frames. The pinned load cell 3 is inserted into the connecting pin 98 and the second connecting hole of the first and second connecting frames to detect the load, thereby detecting the load of the aerial work vehicle. Multiple safety control system. According to claim 1, The first frame is formed on one side of the workbench and the first connection frame and the first connection frame having the first and second connection holes to form a mechanism on the bracket installed on the front end (one side of the gear frame) of the boom A second connection frame having a second connection hole, two connection pins inserted into and interconnected with the first and second connection holes of the first and second connection frames, and the first and second connection frames of the first and second connection frames. 2 The construction work of the aerial vehicle, characterized in that for transmitting the force by using the ball-type sensing member to detect the load of the work platform to the third connecting hole and installing the S-shaped load cell to detect the load of the aerial vehicle Multiple safety control system. The signal load of the load sensor 3 and the acceleration sensor 70 for calculating the load load and the impact amount is output as a sine wave according to the strength of the load, the vibration and the impact. It is applied to the microcomputer 72 after averaging the instantaneous peak value in the signal amplification stage or removing high frequency noise, and software for digitally counting load information and vibration / shock amount so that the operator can recognize it visually. Secondary filter application for setting the timer, reading the sensor AD value when the alarm buzzer is in operation and not in operation, and applying the data according to the variation range of the signal applied from the sensors (3,70). Program routines are provided to determine warning and regulatory signals based on the data, and the actual physical quantity is displayed on the digital display unit 50 or on the liquid crystal display so that the operator can keep checking before and during the operation. The multi-safety control system of aerial work platform, which not only displays in the department but also allows the user to check and confirm the overload status of the workbench in real time in the field. 4. A serial according to any one of claims 1 to 3, which is responsible for communication between the automatic moment limiting device (8), the safety control device (42), and the overload prevention device (33) for expanding the system of the aerial work vehicle. The real time clock unit 76 as a means of providing a reference time for recording the overload / over-shock state of the workbench and the work table, and the driving record processor 77 for recording overload and impact amount data of the workbench; The printer and PC communication unit 78 capable of withdrawing driving record data and the overload restriction signal 29 are appropriately restricted or time-delayed according to the equipment to prevent the boom from vibrating violently and provide a sense of stability to the operator. And an output signal processor 79 for generating an error message, an alarm sound, etc. after the set time has elapsed by determining the lower limit value and the upper limit value of the load. Aerial Work Platform Multi-safety control systems that. The pin type for fixing the rod of the horizontal holding cylinder 102 of the worktable 1 according to any one of claims 1 to 3, which is connected to the rear end of the multistage boom 7 and is supported by the gearpost 95. The pin-shaped load cell 101 is inserted into the rod end of the load cell 103 and the boom swing cylinder 80 to detect the overload or overload of the overall multistage boom 7 by using the moment generated at the end of the worktable 1. Multiple safety control system of the aerial vehicle, characterized in that to perform the multiple safety control function using the overload protection device 33 and the automatic moment limiting device (8).

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