CN110844850B - Safety control system of aerial work platform - Google Patents
Safety control system of aerial work platform Download PDFInfo
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- CN110844850B CN110844850B CN201911136594.8A CN201911136594A CN110844850B CN 110844850 B CN110844850 B CN 110844850B CN 201911136594 A CN201911136594 A CN 201911136594A CN 110844850 B CN110844850 B CN 110844850B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/042—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F13/00—Common constructional features or accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
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- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention relates to the technical field of aerial work platforms, and discloses a safety control system of an aerial work platform, which comprises an ECU (electronic control Unit), a PCU (Power control Unit), a platform ascending valve, a platform descending valve, a forward valve, a backward valve, a left rotating valve, a right rotating valve, an electromagnetic valve, a pit hole switch, a lower limit switch, an upper limit switch and a buzzer, wherein the PCU, the platform ascending valve, the platform descending valve, the forward valve, the backward valve, the left rotating valve, the right rotating; the PCU controls the work of the platform ascending valve, the platform descending valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve through the ECU; the ECU controls the work of the electromagnetic valve, the platform descending valve and the buzzer according to the on-off state of the pit switch and the lower limit switch, and the ECU controls the work of the platform ascending valve according to the on-off state of the upper limit switch. By the mode, the aerial work platform can be safely and reliably operated, and a safe operating environment is provided for aerial workers.
Description
Technical Field
The invention relates to the technical field of aerial work platforms, in particular to a safety control system of an aerial work platform.
Background
The aerial work platform is special equipment for aerial work with wide application, and is particularly widely applied to the building and decoration industries. The aerial work platform comprises a traveling chassis, a fork frame and a working platform, wherein the lower end of the fork frame is fixedly connected with the traveling chassis, and the upper end of the fork frame is fixedly connected with the working platform; the fork frame is provided with a lifting oil cylinder, and the lifting oil cylinder works to drive the fork frame to move up and down so as to control the lifting of the working platform; the traveling chassis can perform forward movement, backward movement, left rotation and right rotation under the driving of the electric element and the hydraulic motor, so that the whole aerial work platform can move and travel conveniently.
The existing aerial work platform only has the operation control of ascending and descending of a working platform and the operation control of advancing, retreating, left turning and right turning of a running chassis; although the existing aerial work platform is convenient to operate and use, the overall safety is poor.
Disclosure of Invention
The invention mainly solves the technical problem of providing a safety control system of an aerial work platform, which can ensure that the aerial work platform is operated safely and reliably and provide a safe operating environment for aerial workers.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a safety control system for an aerial work platform comprising: the device comprises an ECU, a PCU (Power control Unit), a platform ascending valve, a platform descending valve, a forward valve, a backward valve, a left-turn valve, a right-turn valve, an electromagnetic valve, a pit hole switch, a lower limit switch, an upper limit switch and a buzzer, wherein the PCU, the platform ascending valve, the platform descending valve, the forward valve, the backward valve, the left-turn valve, the right-turn valve; the platform ascending valve controls the ascending of a working platform on the aerial work platform, the platform descending valve controls the descending of the working platform on the aerial work platform, the forward valve controls the forward of a running chassis on the aerial work platform, the backward valve controls the backward of the running chassis on the aerial work platform, the left-turn valve controls the left-turn of the running chassis on the aerial work platform, the right-turn valve controls the right-turn of the running chassis on the aerial work platform, and the electromagnetic valve controls the running speed of the running chassis on the aerial work platform; the pit switch is switched on when a pit plate on the driving chassis is put down and switched off when the pit plate on the driving chassis is folded; the lower limit switch is pressed down to be in a switch-on state when the working platform does not rise or the rising height does not exceed the set height or descends from the high position to the set height, and the lower limit switch is lifted up to be in a switch-off state when the rising height of the working platform exceeds the set height; the upper limit switch is pressed down to be in a connection state when the working platform rises to the highest position, and is lifted up to be in a disconnection state under the other conditions; the PCU controls the work of the platform ascending valve, the platform descending valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve through the ECU; the ECU controls the work of the electromagnetic valve, the platform descending valve and the buzzer according to the on-off state of the pit hole switch and the lower limit switch, and the ECU controls the work of the platform ascending valve according to the on-off state of the upper limit switch.
Preferably, the system further comprises an inclination angle sensor connected with the ECU; the inclination angle sensor is fixedly arranged on the upper plane of the running chassis; the inclination angle sensor detects a horizontal transverse inclination angle and a horizontal longitudinal inclination angle of the aerial work platform and sends the detected results to the ECU; ECU compares the horizontal inclination angle value of receiving with horizontal inclination angle setting value, compares the horizontal longitudinal inclination angle value of receiving with horizontal longitudinal inclination angle setting value to according to the result control of comparing between the two whether normal work of lift valve on the platform, whether buzzer works to and the work of pilot lamp on the control inclination sensor.
Preferably, when the horizontal transverse inclination angle value is greater than or equal to the horizontal transverse inclination angle set value or/and the horizontal longitudinal inclination angle value is greater than or equal to the horizontal longitudinal inclination angle set value, the ECU can limit the normal work of the platform ascending valve, and simultaneously control the buzzer to give an alarm sound and control a red indicator lamp on the inclination angle sensor to light and flash; when horizontal inclination angle value is less than horizontal inclination angle setting value, and horizontal longitudinal inclination angle value is less than horizontal inclination angle setting value, ECU does not restrict the normal work of platform lift valve, controls simultaneously bee calling organ is out of work, and control green pilot lamp on the angular transducer lights, if red pilot lamp on the angular transducer lights the scintillation before, then controls red pilot lamp and extinguishes, green pilot lamp lights.
Preferably, the system further comprises a pressure sensor connected with the ECU; the pressure sensor is fixed on a lifting oil cylinder on the aerial work platform; the pressure sensor detects the pressure borne by the working platform on the aerial work platform and sends the detected pressure value to the ECU, and the ECU compares the received pressure value with a pressure set value; when the received pressure value exceeds a pressure set value, the ECU limits the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left rotating valve and the right rotating valve; and when the received pressure value does not exceed the pressure set value, the ECU does not limit the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left-turning valve and the right-turning valve.
Preferably, the device further comprises an angle sensor connected with the ECU; the angle sensor is fixed on a connecting shaft which is connected with the upper fork frame of the aerial work platform and the running chassis; the angle sensor detects a rotation angle value of a fork frame on the aerial work platform relative to a running chassis and sends the detected rotation angle value to the ECU; and the ECU compares the received rotation angle value with a rotation angle set value, and controls whether the platform descending valve, the platform ascending valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve work normally or not according to the comparison result of the rotation angle value and the rotation angle set value.
Preferably, when the received rotation angle value exceeds a rotation angle set value, the ECU limits the normal work of the platform descending valve, the platform ascending valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve; and when the received rotation angle value does not exceed the rotation angle set value, the ECU does not limit the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left-turning valve and the right-turning valve.
Preferably, the emergency power supply further comprises a key switch for controlling whether the power supply supplies power, an emergency stop switch for quickly turning off the power supply, and a circuit breaker for protecting a circuit; after the emergency stop switch is pressed, the key switch is turned to the platform side, the PCU can be operated and used, and the key switch is turned to the chassis side, and the ECU can be operated and used.
Preferably, the PCU is provided with a platform ascending key, a platform descending key, a forward key, a backward key, a left turn key, a right turn key and an enable switch; after the platform ascending key is pressed down, the enabling switch is operated, and the ECU can control the platform ascending valve to work so as to control the working platform on the aerial work platform to ascend; after the platform descending key is pressed down, the enabling switch is operated, the ECU can control the platform descending valve to work, and then the working platform on the aerial work platform is controlled to descend; after the forward key is pressed down, the enabling switch is operated, the ECU can control the forward valve to work, and further control a running chassis on the aerial work platform to move forwards; after the backward key is pressed down, the enabling switch is operated, the ECU can control the backward valve to work, and further control a running chassis on the aerial work platform to move backwards; after the left-turn button is pressed down, the enabling switch is operated, and the ECU can control the left-turn valve to work so as to control the left-turn action of a running chassis on the aerial work platform; after the right turn button is pressed down and the enabling switch is operated, the ECU can control the right turn valve to work, and then the running chassis on the aerial work platform is controlled to turn right.
Preferably, when the platform ascending valve or the platform descending valve works, the ECU controls the pit plate on the running chassis to be put down; if the pit hole plate is not put down when the platform ascending valve or the platform descending valve works, a corresponding fault code is displayed on a display screen of the ECU, and meanwhile, the ECU limits the work of the platform ascending valve or the platform descending valve and controls the buzzer to give out an alarm sound; when the pothole switch is switched on and the lower limit switch is switched off, the ECU controls the running chassis to run at a low speed through the electromagnetic valve; when the pit hole switch is switched on and the lower limit switch is switched on, the ECU controls the platform descending valve to stop working and simultaneously controls the buzzer to give an alarm sound, at the moment, if the platform descending valve continues to work, the operation of an enable switch on the PCU is released, and after N seconds, the platform descending key is pressed down and the enable switch is operated, so that the platform descending valve continues to work and the buzzer stops giving the alarm sound; when the upper limit switch is switched on, the ECU limits the work of the platform ascending valve; when the upper limit switch is turned off, the ECU does not limit the operation of the platform lift valve.
Preferably, the PCU is fixed to the work platform; the ECU is fixed on the running chassis; the pit switch is used for fixing the position, close to the pit plate, on the running chassis.
The invention has the beneficial effects that: the invention can ensure the safe and reliable operation of the aerial work platform and provide a safe operation environment for aerial workers; the operation and use are simple, the flexibility is high, the system has stable functions and low maintenance cost, and the installation is convenient.
Drawings
FIG. 1 is a schematic diagram of a safety control system for an aerial work platform according to the present invention;
fig. 2 is a schematic perspective view of an aerial work platform to which the safety control system is applied.
The parts in the drawings are numbered as follows: 1. a running chassis; 11. a pit plate; 2. a fork; 3. a working platform; 4. lifting the oil cylinder; 5. an ECU; 6. a PCU; 7. a pressure sensor; 8. an angle sensor; 9. an inclination angle sensor.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 and 2, an embodiment of the present invention includes:
a safety control system for an aerial work platform, comprising: an ECU5 (electronic control unit, also called "traveling computer", "vehicle-mounted computer", etc.), and a PCU6 connected to the ECU5, a platform raising valve, a platform lowering valve, a forward valve, a backward valve, a left-turn valve, a right-turn valve, an electromagnetic valve, a pit hole switch, a lower limit switch, an upper limit switch, a buzzer, an inclination angle sensor 9, a pressure sensor 7, an angle sensor 8, a key switch, an emergency stop switch, and a circuit breaker. The ECU5 controls the work operation of the whole aerial platform, and displays the remaining power of the power supply in the aerial platform and the fault code when the fault occurs. The PCU6 controls the forward, backward, left-hand and right-hand movements of the aerial platform, as well as the raising and lowering of the work platform 3 on the aerial platform. The angle sensor 8 is an angle signal detecting element. The pressure sensor 7 is an element that detects a lifting load. The tilt sensor 9 is an angle detection element for horizontal longitudinal tilt angle and horizontal lateral tilt angle. The upper limit switch limits the maximum lifting height of the working platform 3. The pothole switch is associated with the lower limit switch, and can limit the working platform 3 from rising to a set height (the set height refers to the height corresponding to the working platform 3 when the lower limit switch is pressed down in the rising process of the working platform 3; the set height can be adjusted according to the actual situation) and then the high-altitude operation platform runs at a low speed; the work platform 3 can be limited to automatically stop descending after descending from the high position to the set height. The platform lifting valve works to control the working platform 3 on the aerial work platform to lift; the platform descending valve works to control the descending of the working platform 3 on the aerial work platform; the advancing valve works to control the advancing of the traveling chassis 1 on the aerial work platform; the retreating valve works to control the retreating of the running chassis 1 on the aerial work platform; the left-turning valve works to control the left turning of the running chassis 1 on the aerial work platform; the right-turn valve works to control the right turn of the running chassis 1 on the aerial work platform; the electromagnetic valve works to control the running speed of the running chassis 1 on the aerial work platform. The key switch controls whether the power supply supplies power or not; the emergency stop switch can be pressed down in an emergency, and a power supply can be quickly turned off to prevent accidents; the circuit breaker can protect a circuit and avoid short circuit to burn out power supplies and electrical elements.
When the scram switch is pressed, the PCU6 can be operated and used by pushing the key switch to the platform side, and the ECU5 can be operated and used by pushing the key switch to the chassis side. Operating the ECU5, the setting of various parameter values may be entered, such as: the numerical values of the fast walking speed, the slow walking speed, the steering speed and the like; the ECU5 has various curing parameters therein, such as: a horizontal transverse inclination angle set value, a horizontal longitudinal inclination angle set value, a pressure set value, a rotation angle set value and the like.
The PCU6 controls the operations of the platform up valve, the platform down valve, the forward valve, the reverse valve, the left-turn valve, and the right-turn valve through the ECU 5. The PCU6 has a platform up button, a platform down button, a forward button, a backward button, a left turn button, a right turn button, and an enable switch. After the platform ascending key is pressed down and the enabling switch is operated, the ECU5 controls the platform ascending valve to work, and further controls the working platform 3 on the aerial work platform to ascend; after the platform descending key is pressed down and the enabling switch is operated, the ECU5 controls the platform descending valve to work, and further controls the working platform 3 on the aerial work platform to descend; after the forward key is pressed down and the enabling switch is operated, the ECU5 controls the forward valve to work, and further controls the traveling chassis 1 on the aerial work platform to move forwards; after the backward key is pressed down and the enabling switch is operated, the ECU5 controls the backward valve to work, and further controls the traveling chassis 1 on the aerial work platform to move backward; after the left-turn button is pressed down and the enabling switch is operated, the ECU5 controls the left-turn valve to work, and further controls the running chassis 1 on the aerial work platform to turn left; after the right turn button is pressed down and the enabling switch is operated, the ECU5 can control the right turn valve to work, and further control the right turn action of the running chassis 1 on the aerial work platform.
The pit switch is switched on when the pit plate 11 on the running chassis 1 is put down and switched off when the pit plate 11 on the running chassis 1 is put away. When the platform ascending valve or the platform descending valve works, the ECU5 controls the pit plate 11 on the driving chassis 1 to descend; if the pit plate 11 is not lowered (the pit switch is not turned on) when the platform raising valve or the platform lowering valve operates, a corresponding fault code is displayed on a display screen of the ECU5, and meanwhile, the ECU5 limits the operation of the platform raising valve or the platform lowering valve and controls the buzzer to give an alarm sound; so that the worker can repair the adjusting pit and hole plate 11 in time.
The lower limit switch is pressed down to be in a switch-on state when the working platform 3 does not rise or the rising height does not exceed the set height or descends from the high position to the set height, and the lower limit switch is lifted up to be in a switch-off state when the rising height of the working platform 3 exceeds the set height.
When the pothole switch is switched on and the lower limit switch is switched off, the ECU5 controls the running chassis 1 to run at a low speed through the electromagnetic valve; this portion may serve as a pit protection function.
When the pothole switch is switched on and the lower limit switch is switched on, the ECU5 controls the platform descending valve to stop working and controls the buzzer to send out a warning sound at the same time, and the buzzer sends out the warning sound to prompt a worker to notice that the fork frame 2 descends, so that the phenomenon that the fork frame 2 extrudes fingers or goods is prevented. If the operation of the platform lowering valve is to be continued, the operation of the enable switch on the PCU6 is released, and the platform lowering button is pressed and the enable switch is operated after 5 seconds (the change time can be set by the ECU 5), so that the platform lowering valve can be continued to operate and the buzzer stops sounding an alarm. This part can play the function of preventing tong.
The upper limit switch is pressed down to be in a switch-on state when the working platform 3 ascends to the highest position, and is lifted up to be in a switch-off state under other conditions. When the upper limit switch is turned on, the ECU5 limits the operation of the platform lift valve; that is, when the upper limit switch is turned on, the PCU6 is operated, and the platform raising valve does not operate and does not respond. When the upper limit switch is off, the ECU5 does not restrict the operation of the platform lift valve, that is, when the upper limit switch is off, the PCU6 is operated and the platform lift valve can operate normally. The lifting of the working platform 3 can be prevented from exceeding the maximum limit height, and the safety and the reliability of the aerial work platform are ensured. The upper limit switch can play a lifting height limiting function and limit the working platform 3 to continuously ascend when ascending to the limit position.
The tilt angle sensor 9 detects a horizontal lateral tilt angle (a tilt angle of the vehicle in the horizontal direction from the left to the right) and a horizontal longitudinal tilt angle (a tilt angle of the vehicle in the horizontal direction from the front to the rear, that is, a horizontal tilt angle in the traveling direction) of the aerial work platform, and sends the detected results to the ECU 5; the ECU5 compares the received horizontal transverse inclination angle value with the horizontal transverse inclination angle set value (1.6 °), compares the received horizontal longitudinal inclination angle value with the horizontal longitudinal inclination angle set value (3.1 °), and controls whether the platform lift valve normally operates, whether the buzzer operates, and controls the operation of the indicator light on the inclination angle sensor 9 according to the comparison result. When the horizontal transverse inclination angle value is greater than or equal to the horizontal transverse inclination angle set value, or/and the horizontal longitudinal inclination angle value is greater than or equal to the horizontal longitudinal inclination angle set value, the ECU5 will limit the normal operation of the platform ascending valve (i.e. at this moment, the PCU6 is operated, the platform ascending valve does not work and does not respond), and at the same time, the buzzer is controlled to give out an alarm sound, and the red indicator light on the inclination angle sensor 9 is controlled to light and flash; when the horizontal transverse inclination angle value is smaller than the horizontal transverse inclination angle set value and the horizontal longitudinal inclination angle value is smaller than the horizontal transverse inclination angle set value, the ECU5 does not limit the normal operation of the platform ascending valve (namely, the PCU6 is operated at the moment, the platform ascending valve can normally operate), controls the buzzer not to operate, controls the green indicator light on the inclination angle sensor 9 to light up, and controls the red indicator light to turn off and the green indicator light to light up if the red indicator light on the previous inclination angle sensor 9 lights up and flashes. This part can serve an anti-tipping function.
The pressure sensor 7 detects the pressure (gravity) borne by the working platform 3 on the aerial work platform and sends the detected pressure value to the ECU5, and the ECU5 compares the received pressure value with a pressure set value; when the received pressure value exceeds the pressure set value, the ECU5 restricts the normal operation of the platform lowering valve, the platform raising valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve (i.e. restricts the normal operation of the aerial work platform); when the received pressure value does not exceed the pressure set point, the ECU5 does not restrict the normal operation of the platform lowering valve, the platform raising valve, the forward valve, the reverse valve, the left-turn valve, and the right-turn valve. The angle sensor 8 detects a rotation angle value of the fork 2 on the aerial work platform relative to the running chassis 1 and sends the detected rotation angle value to the ECU 5; the ECU5 compares the received rotation angle value with a rotation angle set value, and controls whether the platform lowering valve, the platform raising valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve operate normally according to the comparison result of the two. When the received rotation angle value exceeds the rotation angle set value, the ECU5 restricts the normal operation of the platform lowering valve, the platform raising valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve; when the received rotation angle value does not exceed the rotation angle set value, the ECU5 does not restrict the normal operation of the platform lowering valve, the platform raising valve, the forward valve, the reverse valve, the left-turn valve, and the right-turn valve. In general, the aerial work platform is only operated normally when the values detected by the pressure sensor 7 and the angle sensor 8 are within the corresponding predetermined range values (set values in the ECU5 system). This part may serve an overweight prevention function.
The PCU6 is fixed on the work platform 3 to facilitate its operation on the work platform 3; the ECU5 is fixed on the running chassis 1 so as to be convenient to operate and use on the ground; the pit switch is used for fixing the position, close to the pit plate 11, on the running chassis 1; the pressure sensor 7 is fixed on a lifting oil cylinder 4 on the aerial work platform, and the bearing capacity, namely pressure and gravity, on the work platform 3 is judged and controlled by measuring the pressure of oil in the lifting oil cylinder 4; the angle sensor 8 is fixed on a connecting shaft of the upper fork frame 2 of the aerial work platform and the running chassis 1; the inclination sensor 9 is fixedly mounted on the upper plane of the chassis 1.
The invention can ensure the safe and reliable operation of the aerial work platform and provide a safe operation environment for aerial workers; the operation and use are simple, the flexibility is high, the system has stable functions and low maintenance cost, and the installation is convenient.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A safety control system for an aerial work platform, comprising: the device comprises an ECU, a PCU (Power control Unit), a platform ascending valve, a platform descending valve, a forward valve, a backward valve, a left-turn valve, a right-turn valve, an electromagnetic valve, a pit hole switch, a lower limit switch, an upper limit switch and a buzzer, wherein the PCU, the platform ascending valve, the platform descending valve, the forward valve, the backward valve, the left-turn valve, the right-turn valve; the platform ascending valve controls the ascending of a working platform on the aerial work platform, the platform descending valve controls the descending of the working platform on the aerial work platform, the forward valve controls the forward of a running chassis on the aerial work platform, the backward valve controls the backward of the running chassis on the aerial work platform, the left-turn valve controls the left-turn of the running chassis on the aerial work platform, the right-turn valve controls the right-turn of the running chassis on the aerial work platform, and the electromagnetic valve controls the running speed of the running chassis on the aerial work platform; the pit switch is switched on when a pit plate on the driving chassis is put down and switched off when the pit plate on the driving chassis is folded; the lower limit switch is pressed down to be in a switch-on state when the working platform does not rise or the rising height does not exceed the set height or descends from the high position to the set height, and the lower limit switch is lifted up to be in a switch-off state when the rising height of the working platform exceeds the set height; the upper limit switch is pressed down to be in a connection state when the working platform rises to the highest position, and is lifted up to be in a disconnection state under the other conditions; the PCU controls the work of the platform ascending valve, the platform descending valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve through the ECU; the ECU controls the work of the electromagnetic valve, the platform descending valve and the buzzer according to the on-off state of the pit hole switch and the lower limit switch, and controls the work of the platform ascending valve according to the on-off state of the upper limit switch; when the platform ascending valve or the platform descending valve works, the ECU controls the pit plate on the running chassis to be put down; if the pit hole plate is not put down when the platform ascending valve or the platform descending valve works, a corresponding fault code is displayed on a display screen of the ECU, and meanwhile, the ECU limits the work of the platform ascending valve or the platform descending valve and controls the buzzer to give out an alarm sound; when the pothole switch is switched on and the lower limit switch is switched off, the ECU controls the running chassis to run at a low speed through the electromagnetic valve; when the pit hole switch is switched on and the lower limit switch is switched on, the ECU controls the platform descending valve to stop working and simultaneously controls the buzzer to give an alarm sound, at the moment, if the platform descending valve continues to work, the operation of an enabling switch on the PCU is released, and after N seconds, a platform descending key and an operation enabling switch on the PCU are pressed, so that the platform descending valve continues to work and the buzzer stops giving the alarm sound; when the upper limit switch is switched on, the ECU limits the work of the platform ascending valve; when the upper limit switch is turned off, the ECU does not limit the operation of the platform lift valve.
2. The safety control system of an aerial work platform as claimed in claim 1, wherein: the device also comprises an inclination angle sensor connected with the ECU; the inclination angle sensor detects a horizontal transverse inclination angle and a horizontal longitudinal inclination angle of the aerial work platform and sends the detected results to the ECU; ECU compares the horizontal inclination angle value of receiving with horizontal inclination angle setting value, compares the horizontal longitudinal inclination angle value of receiving with horizontal longitudinal inclination angle setting value to according to the result control of comparing between the two whether normal work of lift valve on the platform, whether buzzer works to and the work of pilot lamp on the control inclination sensor.
3. A safety control system for an aerial work platform as claimed in claim 2, wherein: when the horizontal transverse inclination angle value is larger than or equal to the horizontal transverse inclination angle set value or/and the horizontal longitudinal inclination angle value is larger than or equal to the horizontal longitudinal inclination angle set value, the ECU can limit the normal work of the platform ascending valve, and simultaneously control the buzzer to give out alarm sound and control a red indicator lamp on the inclination angle sensor to light up and flash; when horizontal inclination angle value is less than horizontal inclination angle setting value, and horizontal longitudinal inclination angle value is less than horizontal inclination angle setting value, ECU does not restrict the normal work of platform lift valve, controls simultaneously bee calling organ is out of work, and control green pilot lamp on the angular transducer lights, if red pilot lamp on the angular transducer lights the scintillation before, then controls red pilot lamp and extinguishes, green pilot lamp lights.
4. The safety control system of an aerial work platform as claimed in claim 1, wherein: the pressure sensor is connected with the ECU; the pressure sensor detects the pressure borne by the working platform on the aerial work platform and sends the detected pressure value to the ECU, and the ECU compares the received pressure value with a pressure set value; when the received pressure value exceeds a pressure set value, the ECU limits the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left rotating valve and the right rotating valve; and when the received pressure value does not exceed the pressure set value, the ECU does not limit the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left-turning valve and the right-turning valve.
5. A safety control system for an aerial work platform as claimed in claim 1 or claim 4 wherein: the device also comprises an angle sensor connected with the ECU; the angle sensor detects a rotation angle value of a fork frame on the aerial work platform relative to a running chassis and sends the detected rotation angle value to the ECU; and the ECU compares the received rotation angle value with a rotation angle set value, and controls whether the platform descending valve, the platform ascending valve, the forward valve, the backward valve, the left-turn valve and the right-turn valve work normally or not according to the comparison result of the rotation angle value and the rotation angle set value.
6. A safety control system for an aerial work platform as claimed in claim 5 wherein: when the received rotation angle value exceeds a rotation angle set value, the ECU limits the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left rotating valve and the right rotating valve; and when the received rotation angle value does not exceed the rotation angle set value, the ECU does not limit the normal work of the platform descending valve, the platform ascending valve, the advancing valve, the retreating valve, the left-turning valve and the right-turning valve.
7. The safety control system of an aerial work platform as claimed in claim 1, wherein: the emergency power supply also comprises a key switch for controlling whether the power supply supplies power, an emergency stop switch for quickly closing the power supply and a circuit breaker for protecting a circuit; after the emergency stop switch is pressed, the key switch is turned to the platform side, the PCU can be operated and used, and the key switch is turned to the chassis side, and the ECU can be operated and used.
8. A safety control system for an aerial work platform as claimed in claim 1 or claim 7 wherein: the PCU is provided with a platform ascending key, a platform descending key, a forward key, a backward key, a left-turning key, a right-turning key and an enabling switch; after the platform ascending key is pressed down, the enabling switch is operated, and the ECU can control the platform ascending valve to work so as to control the working platform on the aerial work platform to ascend; after the platform descending key is pressed down, the enabling switch is operated, the ECU can control the platform descending valve to work, and then the working platform on the aerial work platform is controlled to descend; after the forward key is pressed down, the enabling switch is operated, the ECU can control the forward valve to work, and further control a running chassis on the aerial work platform to move forwards; after the backward key is pressed down, the enabling switch is operated, the ECU can control the backward valve to work, and further control a running chassis on the aerial work platform to move backwards; after the left-turn button is pressed down, the enabling switch is operated, and the ECU can control the left-turn valve to work so as to control the left-turn action of a running chassis on the aerial work platform; after the right turn button is pressed down and the enabling switch is operated, the ECU can control the right turn valve to work, and then the running chassis on the aerial work platform is controlled to turn right.
9. The safety control system of an aerial work platform as claimed in claim 1, wherein: the PCU is fixed on the working platform; the ECU is fixed on the running chassis; the pit switch is used for fixing the position, close to the pit plate, on the running chassis.
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| CN201911136594.8A CN110844850B (en) | 2019-11-19 | 2019-11-19 | Safety control system of aerial work platform |
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| CN113830011A (en) * | 2021-08-31 | 2021-12-24 | 江苏汇智高端工程机械创新中心有限公司 | Complete machine control system and method for full-electric scissor-type aerial work platform |
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| KR20160071560A (en) * | 2014-12-11 | 2016-06-22 | 에이제이네트웍스 주식회사 | Lifting apparatus of high place working vehicles |
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| JP2001278591A (en) * | 2000-03-30 | 2001-10-10 | Aichi Corp | Jack operation control device for working vehicle |
| JP2002265199A (en) * | 2001-03-07 | 2002-09-18 | Aichi Corp | Safety device for working vehicle |
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