CN215885930U - Lifting platform control system for driving of hoister - Google Patents
Lifting platform control system for driving of hoister Download PDFInfo
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- CN215885930U CN215885930U CN202122168762.0U CN202122168762U CN215885930U CN 215885930 U CN215885930 U CN 215885930U CN 202122168762 U CN202122168762 U CN 202122168762U CN 215885930 U CN215885930 U CN 215885930U
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Abstract
A lifting platform control system for driving a hoister relates to the technical field of lifting platform control. The problems that the existing elevator control system is complex in assembly and low in applicability, and the height control of the lifting platform can be realized only by a plurality of distance sensors, so that the cost of the lifting system is high are solved; and the problem that the error generated by the adopted scheme can not realize accurate positioning. The lifting platform control system is internally provided with an encoder and at least one position calibration switch, and the encoder is used for detecting distance information of the lifting platform driven by the transmission device to be lifted and sent to the PLC control device; at least one position calibration switch is fixed at the appointed height of lifting guide rail to output position calibration signal gives PLC controlling means, and this PLC controlling means passes through drive arrangement control transmission, drives lift platform along lifting guide rail lift to appointed height. The utility model can realize the accurate positioning of the lifting platform and is suitable for the construction operation of building outer walls or shaft internal loads.
Description
Technical Field
The utility model belongs to the field of electrical control, and particularly relates to the technical field of lifting platform control.
Background
At present, the lifting platform driven by the hoister is used for carrying people or goods in an outer wall or a hoistway of a building and can also be constructed and operated on the platform. The traditional lifting platform control system generally adopts a contactor to directly control a motor, the impact of a lifter is large when the lifter is started and stopped, the height of the lifter is inaccurate, articles on the lifter are easy to fall, danger is caused, and interference or damage is easily caused if some precision equipment is placed on a platform. In addition, the existing common lifter has uncontrollable lifting height information, cannot achieve accurate positioning, and cannot automatically run to a specified height. The system has no early warning and shutdown protection on the windy weather, and is easy to cause safety accidents because the windy environment is used outdoors.
In order to solve the problem that the lifting height of the conventional lifter cannot be accurately positioned, in two lifter height control methods disclosed in the utility model patent application "high-speed lifter control system based on PLC control" of Chinese patent document No. CN106814684A and the utility model patent application "lifter lifting height control method" of Chinese patent document No. CN110825097A, a position sensor mode or a distance sensor positioning feedback mode is adopted for positioning, and although the method can realize height positioning, the two methods have high requirements on environment, are complex to assemble and have poor applicability, and for a lifter suitable for a higher building, a plurality of sensors are needed, so that the lifting system has high cost.
In the prior art, an encoder is adopted as a technical scheme for obtaining the height of the elevator, the defects existing in the scheme can be solved firstly, the height of the elevator platform is obtained by calculating the information output by the encoder in the scheme, however, most of the existing elevators are driven by a hoisting machine in a steel wire rope traction mode, counting deviation can be generated in the steel wire rope winding process, the condition of inaccurate height positioning is caused, in addition, the error can be increased along with the increase of the lifting height and the increase of the running stroke of the elevator platform, and further, the accurate positioning can not be realized.
SUMMERY OF THE UTILITY MODEL
The novel elevator control system solves the problems that the existing elevator control system is complex in assembly and low in applicability, and the height control of the lifting platform can be realized only by a plurality of distance sensors, so that the cost of the lifting system is high; and the problem that the error generated by the adopted scheme can not realize accurate positioning. The utility model provides a lifting platform control system for driving a hoister
The utility model relates to a lifting platform control system for driving a hoister, which comprises a lifting platform, a lifting guide rail, a transmission device, a driving device, a PLC (programmable logic controller) control device, an encoder and at least one position calibration switch, wherein the lifting platform is fixed on the lifting guide rail, and the transmission device is used for driving the lifting platform to slide up and down along the lifting guide rail; the driving device outputs power to the driving transmission device; the PLC control device outputs a control signal to the driving device to realize the control of the driving device; the PLC control device is used for acquiring an output signal of the encoder and also used for acquiring a position calibration signal output by the position calibration switch; the encoder is used for detecting the distance information of the lifting platform driven by the transmission device; the position calibration switch is fixed at the specified height of the lifting guide rail.
Preferably, the number of the position calibration switches is 3, the 3 position calibration switches are arranged along the upright column, the 3 position calibration switches are arranged at equal intervals in the stroke of the lifting table, and the output ends of the three position calibration switches are respectively connected with the signal input ends of the three position calibration switches of the PLC control device.
Further, transmission includes trough of belt internal tooth dish, fixed pulley group and wire rope, and the fixed pulley group is fixed on the lift guide rail top, and wire rope's one end is fixed and twines on the trough of belt internal tooth dish, wire rope's the other end is walked around fixed pulley group and lift platform fixed connection, drive arrangement are used for driving the trough of belt internal tooth dish and rotate, and the encoder is used for detecting the rotation information of this trough of belt internal tooth dish.
Furthermore, the driving device comprises a frequency converter and a hoisting machine, the power output end of the hoisting machine is connected with the power input end of the driving transmission device, the control signal input end of the hoisting machine is connected with the driving signal output end of the frequency converter, and the control signal input end of the frequency converter is connected with the hoisting machine control signal end of the PLC control device.
Furthermore, the control system also comprises an anemoscope which is arranged at the top end of the lifting guide rail, and the anemoscope realizes data interaction with the PLC control device through serial communication.
Further, the control system further comprises an upper limit switch and a lower limit switch, the upper limit switch and the lower limit switch are respectively installed at two ends of the effective sliding stroke of the lifting guide rail, the upper limit switch is located at the highest point of the stroke, the lower limit switch is located at the lowest point of the stroke, and output signals of the upper limit switch and the lower limit switch are respectively connected to an upper limit detection signal input end and a lower limit detection signal input end of the PLC control device.
Further, control system still includes upper limit switch and lower limit switch, upper limit switch and lower limit switch set up along lifting guide, upper limit switch fixes in upper limit switch's top, lower limit switch fixes in lower limit switch's below, upper limit switch and lower limit switch output signal respectively to PLC controlling means's super upper limit detection signal input and super lower limit detection signal input.
Further, the control system also comprises a touch screen, and the touch screen performs data interaction with the PLC control device in a serial communication mode.
Furthermore, the control system also comprises a centrifugal safety lock and a safety lock interlocking switch, the centrifugal safety lock is fixed on the lifting platform, the steel wire rope penetrates through the centrifugal safety lock and is fixedly connected with the lifting platform, the safety lock interlocking switch is installed on the transmission device, and the safety lock interlocking output switch signals to a safety lock signal input end of the PLC control device.
Furthermore, the control system also comprises an electric cabinet, an ascending button, a descending button, a safety reset button, an emergency stop button, a three-color indicator lamp, a safety relay and a safety reset relay; the ascending button, the descending button, the safety reset button, the emergency stop button and the touch screen are all arranged on a panel of the electric cabinet, the PLC control device and the safety relay are fixed inside the electric cabinet, and the three-color indicator lamp is arranged at the top of the electric cabinet; the ascending button outputs an ascending control signal to an ascending control signal input end of the PLC control device, and the descending button outputs a descending control signal to a descending control signal input end of the PLC control device; the PLC control device outputs a signal lamp control signal to the three-color indicator lamp; the safety reset button and the normally closed switch of the safety reset relay are connected in series in a return circuit of a reset circuit of the safety relay, the emergency stop button is connected in series in a power supply loop of the safety relay, and a normally open switch of the safety relay and a coil of the safety reset relay are connected in series in the power supply loop.
Compared with the prior art, the lifting platform control system for the elevator drive has the advantages that:
1. according to the utility model, at least one position calibration switch is arranged in the stroke of the lifting platform, and each position calibration switch corresponds to a preset height, so that the current height can be corrected once when the lifting platform passes through the position calibration switch every time, errors caused by long-time operation of the current height and a transmission structure obtained by only adopting an encoder are overcome, the height information of the lifting platform is effectively improved, the height control of the lifting platform is more accurate, and the lifting platform is more accurately controlled to be lifted to a specified height position.
2. According to the utility model, the upper limit switch and the lower limit switch are respectively arranged at the two ends of the stroke of the lifting platform, so that the condition that the lifting platform runs beyond the stroke can be avoided, and safety accidents are avoided.
3. The upper limit switch and the lower limit switch are arranged above and below the upper limit switch and the lower limit switch, so that the safe operation of the lifting system is further ensured, and safety accidents caused by the fact that the upper limit switch or the lower limit switch breaks down are avoided.
4. According to the utility model, the anemoscope is arranged at the top of the lifting system, so that the wind speed of the environment where the lifting system is located is detected, the running speed of the lifting platform can be adjusted and controlled or stopped according to the wind speed, and the running safety of the lifting platform is further effectively ensured when the wind speed is high.
5. According to the utility model, the centrifugal safety lock and the safety lock interlocking switch are arranged in the lifting system and work in a matching way, when the lifting platform falls extremely in an accident situation, the safety lock locks the falling platform, the safety lock interlocking switch cuts off an electrical control loop, the platform is prevented from being electrically dragged after being locked, and the secondary damage or safety accident to workers caused by the failure of the lifting platform is effectively prevented.
6. The utility model adopts the touch screen as data input and output equipment, the touch screen can also be used as information output equipment, the control information can be conveniently input by an operator, the current height and target height information of the lifting platform can be more intuitively and accurately obtained by the operator, and even the running state of the lifter and the environmental information such as the wind speed of the position of the lifter can be displayed, so that the control of the lifting platform is more facilitated.
Drawings
Fig. 1 is a front view of an electrical control box according to the present invention.
FIG. 2 is a schematic view of a connector interface at the bottom of the electrical control box of FIG. 1.
Fig. 3 is a schematic display interface diagram of a touch screen according to a seventh embodiment.
Fig. 4 is a mechanical schematic diagram of the elevator platform control system for elevator drive according to the present invention.
Fig. 5 is a schematic diagram of an electrical principle related to a frequency converter in the control system of the lifting platform according to the present invention.
Fig. 6 is a schematic diagram of an electrical connection relationship between the sensor and the PLC control device of the lift platform control system of the present invention.
Fig. 7 is a schematic diagram of an electrical connection relationship of a digital input module in a PLC control device in the lifting platform control system according to the present invention.
Fig. 8 is a schematic diagram of an electrical connection of a safety relay in the lift platform control system of the present invention.
In the figure, 1 is a touch panel, 2 is an up button SB1, 3 is a safety reset button SB5, 4 is a down button SB2, 5 is an emergency stop button SB0, 6 is a three-color indicator lamp, 7 is a power outlet, 8 is a lifter connector, 9 is an encoder connector, 10 is an anemometer connector, 11 is a position calibration switch and all limit switch connectors, 14 is a display of a current wind speed, 15 is a display of a current height, 16 is an inputtable target height, 17 is a lower position calibration instruction, 18 is a middle position calibration instruction, 19 is an upper position calibration instruction, 20 is a platform up instruction, 21 is a platform down instruction, 22 is a manual up button, 23 is a manual down button, 24 is a manual/automatic switching button, 25 is a manual/automatic display, 26 is an operation button, 27 is a stop button, 28 is an anemometer, 29 is an upper limit switch, reference numeral 30 denotes an upper limit switch, 31 denotes an upper position calibration switch, 32 denotes a middle position calibration switch, 33 denotes a lower position calibration switch, 34 denotes a lower limit switch, 35 denotes a lower limit switch, 36 denotes a lifter, and 37 denotes an encoder.
Detailed Description
The technical solution described in the present application is described below with reference to the accompanying drawings.
The first embodiment is described with reference to fig. 4, and the lifting platform control system for driving the hoister in the embodiment comprises a lifting platform, a lifting guide rail, a transmission device, a driving device and a PLC (programmable logic controller) control device; the control system further includes an encoder 37 and at least one position calibration switch; the lifting platform is fixed on the lifting guide rail, and the transmission device is used for driving the lifting platform to slide up and down along the lifting guide rail; the driving device outputs power to the driving transmission device; the PLC control device outputs a control signal to the driving device to realize the control of the driving device; the PLC control device collects the output signal of the encoder 37, and is also used to collect the position calibration signal output by the position calibration switch; the encoder 37 is used for detecting the distance information of the lifting platform driven by the transmission device; the position calibration switch is fixed at the preset height of the lifting guide rail.
This embodiment adopts the encoder to realize the collection of elevating platform height information to at least one position calibration switch has been increased, position calibration switch sets up the height of predetermineeing at the elevating rail, and is arranged in the stroke of elevating platform, and when the elevating platform passes through this position calibration switch, this position calibration switch output position calibration signal gives PLC controlling means, makes this PLC controlling means can replace the height information that obtains through the encoder at present for the appointed height information that this position calibration switch belongs to, and then realize the calibration to the elevating platform height, later height information calculates based on the signal that this information superposition encoder sent and obtains.
The existing lifting platform driving system mostly adopts a steel wire rope to realize the driving of the lifting platform, in practical application, the lifting platform needs frequent repeated lifting movement, in this case, the height information is obtained by calculating only through a rotation signal of a transmission device obtained by an encoder, when the total superposition of the lifting platform is formed to be long, errors are superposed, and further the obtained height information is inaccurate, and the accurate control of the lifting platform is influenced. According to the utility model, the position calibration switch is arranged at the designated height, so that the correction of the height error is realized, and the height positioning precision of the lifting platform is further improved.
In practical application, a plurality of position calibration switches can be arranged according to the total stroke of the lifting platform, and the position calibration switches can be arranged at equal intervals in the stroke of the lifting platform and can also be arranged according to other rules. The specific setting rule can be determined according to the total stroke of the lifting platform and the surrounding environment.
For example: referring to fig. 4, three position calibration switches are provided, from high to low: the upper position calibration switch 31, the middle position calibration switch 32 and the lower position calibration switch 33, three position calibration switches correspond three height of predetermineeing respectively, three position calibration switches adopt equidistant setting, under this kind of circumstances, when the elevating platform passes through arbitrary three position calibration switch, trigger corresponding switch, then PLC controlling means will realize once the calibration to height information, and then guarantee the high accurate location of elevating platform.
In another embodiment, the present invention further defines the transmission device in the lifting platform control system according to the first embodiment, the transmission device includes a grooved inner cog, a fixed pulley block and a steel wire rope, the fixed pulley block is fixed at the top end of the lifting guide rail, one end of the steel wire rope is fixed and wound on the grooved inner cog, the other end of the steel wire rope bypasses the fixed pulley block and is fixedly connected to the lifting platform, the driving device is configured to drive the grooved inner cog to rotate, and the encoder 37 is configured to detect rotation information of the grooved inner cog.
In practical applications, referring to fig. 6, the encoder 37 has two signal output terminals, which are respectively connected to two signal input terminals I0.0 and I0.1 of the PLC control device. The encoder 37 is used to detect the rotation signal of the grooved inner toothed disc, namely: the encoder 37 sends a rotation signal of the grooved inner toothed disc, which drives the wire rope connected to the lift platform, to the PLC control device in the form of a pulse, so that the length of extension or retraction of the wire rope can be calculated by the rotation of the grooved inner toothed disc, the movement distance of the lift platform can be obtained, and finally the current height information of the lift platform can be obtained. The calculation process can be implemented by using the conventional calculation method, for example: the initial height of lift platform is 1000mm, and the fluted disc internal tooth rotates the corresponding lift distance of a round and is 167.47mm, and the fluted disc of once only running has rotated 5.5 rings, and encoder 37 has just so rotated 5.5 rings, encoder 37 sends its number of turns of rotation to PLC controlling means in pulse form, PLC controlling means passes through software calculation, promptly: 167.47mm multiplied by 5.5 circles to obtain that the current running distance of the lifting platform is 921.085mm, and the current height of the lifting platform plus the initial height is 1921.085 mm.
Third embodiment this embodiment will be described with reference to fig. 4 to 6. In this embodiment, the driving device in the lifting platform control system according to the first embodiment is further limited, the driving device includes a frequency converter and a hoisting machine 36, a power output end of the hoisting machine 36 is connected to a power input end of the driving transmission device, a control signal input end of the hoisting machine 36 is connected to a driving signal output end of the frequency converter, and a control signal input end of the frequency converter is connected to a control signal end of the hoisting machine 36 of the PLC control device.
In practical applications, the connection relationship between the PLC control device, the inverter, and the hoist 36 is determined according to the selected inverter, and a specific electrical connection relationship is shown in fig. 5. PLC controlling means passes through control relay KA 6's control coil, realizes the control to the power supply of converter, promptly: the normally open contact of the relay KA6 is connected with the control coil of the alternating current contactor KM0 in series, the on-off state of the alternating current contactor KM0 is controlled through the relay KA6, the main contact of the alternating current contactor KM0 is connected with the power supply section of the frequency converter in series, and the control of the power supply of the frequency converter is achieved.
The frequency converter is also used for controlling a brake system for lifting the frequency converter, and brake control of the lifter is realized. For example: referring to the brake control electrical connections shown in fig. 5 and 7: the brake control signal of converter controls brake relay KA4, KA 5's control coil simultaneously, wherein a normally open contact of brake relay KA5 establishes ties in the power supply circuit who promotes motor brake control device, another normally open contact output brake signal of this relay KA5 gives PLC controlling means, the normally open contact of relay KA4 is used for sending the brake start signal and gives promotion motor brake control device, be used for realizing the brake control to the lifting machine.
The PLC control device sends ascending and descending control signals and frequency conversion signals to the frequency converter through the relay, and control over the frequency converter is achieved. The specific connection relationship is, for example: referring to fig. 5 and 6, a rising control signal, a falling control signal and a frequency conversion signal output by the PLC control device respectively control a control coil of the up intermediate relay KA1, a control coil of the down relay KA2 and a control coil of the frequency conversion relay KA3, a normally open contact of the up intermediate relay KA1 outputs a signal to a forward rotation control signal input terminal DI1 of the frequency converter, a normally open contact of the down relay KA2 outputs a signal to a reverse rotation control signal input terminal DI2 of the frequency converter, and a normally open contact of the frequency conversion relay KA3 outputs a frequency conversion signal to a frequency conversion signal input terminal DI3 of the frequency converter. The frequency converter also outputs a fault signal to a frequency conversion fault signal input end of the PLC control device.
The frequency converter can be used for realizing the setting of acceleration and deceleration time to enable the hoister 36 to start and stop stably, and when the target height is approached, the positioning accuracy is improved in a low-speed movement mode. For example: if the platform is required to be lifted to 3000mm from the current height of 1921.085mm, the system judges that the target overestimation is higher than the current height, a lifting instruction is executed, the lifting platform gradually accelerates to move upwards, the encoder 37 performs real-time final current height in the upward process, and the speed is reduced when the height reaches 2900mm, so that the machine can be stopped in time when the height reaches 3000, and the positioning deviation is reduced.
Fourth embodiment this embodiment will be described with reference to fig. 4 and 6. The present embodiment is further limited to the lifting platform control system according to the first embodiment, the control system further includes an anemoscope 28, the anemoscope 28 is mounted at the top end of the lifting guide rail, and the anemoscope 28 realizes data interaction with the PLC control device through serial communication.
The manner of communication between the anemometer 28 and the PLC control device may be determined according to the type of anemometer 28 actually selected, for example: referring to fig. 6, the anemoscope 28 and the PLC control device implement data interaction by using RS485 serial communication.
In the embodiment, the anemoscope 28 is added, the anemoscope 28 can collect the wind speed at the top end of the lifting guide rail and send the wind speed to the PLC control device, and in practical application, the working mode of the whole lifting platform control system can be adjusted according to the wind speed information fed back by the anemoscope 28. For example: when the wind speed fed back by the anemoscope is greater than a certain set value, the running speed of the lifting platform can be reduced, and even the equipment is stopped to ensure the safe running of the whole system, so that the safety accident caused by overlarge wind speed is avoided.
Fifth embodiment referring to fig. 4 and 6, the present embodiment. In this embodiment, the lifting platform control system described in the first embodiment is further limited, the control system further includes an upper limit switch 30 and a lower limit switch 34, the upper limit switch 30 and the lower limit switch 34 are respectively installed at two ends of the effective sliding stroke of the lifting guide rail, wherein the upper limit switch 30 is located at the highest point of the stroke, the lower limit switch 34 is located at the lowest point of the stroke, and the output signals of the upper limit switch and the lower limit switch 34 are respectively connected to the upper limit detection signal input end and the lower limit detection signal input end of the PLC control device.
In practical application, referring to fig. 4, the upper limit switch 30 and the lower limit switch 34 are respectively disposed at two end positions of the stroke of the lifting platform, and are used for detecting whether the lifting platform reaches the highest point or the lowest point of the stroke, and sending a detection signal to the PLC control device. In the control process, when the lifting platform triggers the upper limit switch 30, the lifting platform can only move downwards after that, whereas when the lifting platform triggers the lower limit switch 34 in the descending process, the lifting platform can only move upwards after that.
Sixth embodiment this embodiment will be described with reference to fig. 4 and 6. The lifting platform control system of the fifth embodiment is further limited in the present embodiment, the control system further includes an upper limit switch 29 and a lower limit switch 35, the upper limit switch 29 and the lower limit switch 35 are disposed along the lifting guide rail, the upper limit switch 29 is fixed above the upper limit switch 30, the lower limit switch 35 is fixed below the lower limit switch 34, and the upper limit switch 29 and the lower limit switch 35 respectively output signals to the upper limit detection signal input end and the lower limit detection signal input end of the PLC control device.
In practical use, as shown in fig. 4, the upper limit switch 29 and the lower limit switch 35 are respectively disposed above the upper limit switch 30 and below the lower limit switch 34. The two switches are arranged to more effectively ensure the safe operation of the lifting system, namely: when the lifting platform triggers the upper limit switch 29 or the lower limit switch 35, which indicates that the lifting platform exceeds the specified stroke, the PLC control device can forcibly stop the driving device and control the whole system to stop working, so that safety accidents caused by the fact that the lifting platform exceeds the stroke are avoided.
The seventh embodiment will be described with reference to fig. 3, which is a further limitation of the lifting platform control system according to any one of the first to sixth embodiments, and the control system further includes a touch panel 1, and the touch panel 1 performs data interaction with the PLC control device by a serial communication method.
A touch screen is a device for information acquisition and output. In practical use, the touch screen 1 can be used as a signal input device to collect various control information of the lifting platform, such as: target height 16, manual up control signal 22, manual down control signal 23, manual/automatic switching control signal 24, run control signal 26 and stop control signal 27 can be collected. The touch screen 1 can also be commonly used as a signal information display output device, for example: parameters or status information that the operator needs to know, such as output current wind speed 14, current altitude 15, target altitude 16 (input), lower position calibration indication 17, middle and lower position calibration indication 18, upper and lower position calibration indication 19, platform up indication 20, platform down indication 21, and manual/automatic display 25, may be displayed. The above functions can be realized by the means of ordinary skill in the art which is known to those skilled in the art.
The control system further comprises a centrifugal safety lock and a safety lock interlocking switch, wherein the centrifugal safety lock is fixed on the lifting platform, a steel wire rope penetrates through the centrifugal safety lock and is fixedly connected with the lifting platform, the safety lock interlocking switch receives a starting trigger signal of the centrifugal safety lock, and the safety lock interlocking outputs a switching signal to a safety lock signal input end of the PLC control device.
The safety lock interlocking switch is an effective protection means for realizing high-altitude falling objects by matching with a centrifugal safety lock. The centrifugal safety lock is an anti-falling protection device, in practical application, a signal output end of a safety lock interlocking switch is connected to a safety lock signal input end of a PLC control device, when the descending speed of a lifting platform is too high, the centrifugal safety lock can lock a safety steel wire rope, and the lifting platform is prevented from descending in a free falling mode. However, in the actual working process, the situation that the driving device continues to operate after the centrifugal safety lock is started may also occur, and in this situation, the safety steel wire rope will be pulled, so that a safety accident occurs.
Ninth embodiment this embodiment will be described with reference to fig. 1 to 8. The present embodiment is further limited to the lifting platform control system according to any one of the first to eighth embodiments, and the control system further includes an electric cabinet, a raising button 2, a lowering button 4, a safety reset button 3, an emergency stop button 5, a three-color indicator lamp 6, a safety relay, and a safety reset relay KA 10;
the ascending button 2, the descending button 4, the safety reset button 3, the emergency stop button 5 and the touch screen 1 are all arranged on a panel of the electric cabinet, the PLC control device and the safety relay are fixed inside the electric cabinet, and the three-color indicator lamp 6 is arranged at the top of the electric cabinet; the ascending button 2 outputs an ascending control signal to an ascending control signal input end of the PLC control device, and the descending button 4 outputs a descending control signal to a descending control signal input end of the PLC control device; the PLC control device outputs a signal lamp control signal to the three-color indicator lamp 6; the safety reset button 3 and a normally closed switch of the safety reset relay KA10 are connected in series in a return circuit of a reset circuit of the safety relay, the emergency stop button 5 is connected in series in a power supply return circuit of the safety relay, and a normally open switch of the safety relay and a coil of the safety reset relay are connected in series in the power supply return circuit.
This embodiment has increased the electric cabinet for deposit electrical components such as PLC controlling means, and simultaneously, also regard as manual operation platform, fix manual operation's components and parts on the panel of electric cabinet, the operation of being convenient for, the device that will show output simultaneously also fixes on the panel of electric cabinet, the operating personnel of being convenient for look over the relevant information of elevating platform operation, and fix tristimulus designation lamp 6 at the electric cabinet top, be convenient for be located the elevating platform, and near everyone can both clear see the state of elevating platform control system operation.
In practical applications, in order to facilitate electrical connection between the inside of the power control box and the external electrical components, an electrical connector may be disposed at the bottom or the back of the power control box, for example: referring to fig. 3, there may be provided a power socket 7, a lifter connector 8, an encoder connector 9, an anemometer connector 10 and a position calibration switch and all limit switch connectors 11.
The above embodiments are merely examples of the elevator platform control system for driving the elevator machine according to the present invention, and the actual protection scope is not limited to the specific embodiments described in the above embodiments, and may be a reasonable combination of the technical features described in the above embodiments, or may be equivalent alternatives to the specific embodiments described in the above embodiments, or may be directly derived.
Claims (10)
1. A lifting platform control system for driving a lifter comprises a lifting platform, a lifting guide rail, a transmission device, a driving device and a PLC control device; characterized in that the control system further comprises an encoder (37) and at least one position calibration switch;
the lifting platform is fixed on the lifting guide rail, and the transmission device is used for driving the lifting platform to slide up and down along the lifting guide rail; the driving device outputs power to the driving transmission device;
the PLC control device outputs a control signal to the driving device to realize the control of the driving device; the PLC control device is used for acquiring output signals of the encoder (37) and also used for acquiring position calibration signals output by each position calibration switch;
the encoder (37) is used for detecting the distance information of the lifting platform driven by the transmission device;
the position calibration switch is fixed at the specified height of the lifting guide rail.
2. The system as claimed in claim 1, wherein the number of the position calibration switches is 3, the 3 position calibration switches are disposed along the column, and the 3 position calibration switches are disposed at equal intervals in the stroke of the lifting platform, and the output terminals of the three position calibration switches are respectively connected to the signal input terminals of the three position calibration switches of the PLC control device.
3. The system as claimed in claim 1, wherein the transmission device includes a grooved inner cog, a fixed pulley set and a steel cable, the fixed pulley set is fixed on the top end of the lifting rail, one end of the steel cable is fixed and wound on the grooved inner cog, the other end of the steel cable bypasses the fixed pulley set and is fixedly connected with the lifting platform, the driving device is used for driving the grooved inner cog to rotate, and the encoder (37) is used for detecting rotation information of the grooved inner cog.
4. The lifting platform control system for the elevator driving according to claim 1, wherein the driving device comprises a frequency converter and an elevator (36), a power output end of the elevator (36) is connected with a power input end of the driving transmission device, a control signal input end of the elevator (36) is connected with a driving signal output end of the frequency converter, and a control signal input end of the frequency converter is connected with a control signal end of the elevator (36) of the PLC control device.
5. The control system of claim 1, further comprising an anemometer (28), wherein the anemometer (28) is installed on top of the lifting rail, and the anemometer (28) realizes data interaction with the PLC control device through serial communication.
6. The lifting platform control system for the elevator driving as claimed in claim 1, wherein the control system further comprises an upper limit switch (30) and a lower limit switch (34), the upper limit switch (30) and the lower limit switch (34) are respectively installed at two ends of the effective sliding stroke of the lifting guide rail, wherein the upper limit switch (30) is located at the highest point of the stroke, the lower limit switch (34) is located at the lowest point of the stroke, and the output signals of the upper limit switch and the lower limit switch (34) are respectively connected to the upper limit detection signal input end and the lower limit detection signal input end of the PLC control device.
7. The control system of claim 6, further comprising an upper limit switch (29) and a lower limit switch (35), wherein the upper limit switch (29) and the lower limit switch (35) are disposed along the lifting guide rail, the upper limit switch (29) is fixed above the upper limit switch (30), the lower limit switch (35) is fixed below the lower limit switch (34), and the upper limit switch (29) and the lower limit switch (35) output signals to the ultra-upper limit detection signal input end and the ultra-lower limit detection signal input end of the PLC control device, respectively.
8. The control system of any one of claims 1 to 7, further comprising a touch screen (1), wherein the touch screen (1) performs data interaction with the PLC control device through serial communication.
9. The control system of any one of claims 1 to 7, further comprising a centrifugal safety lock and a safety lock interlock switch, wherein the centrifugal safety lock is fixed on the lifting platform, and the steel wire rope passes through the centrifugal safety lock and is fixedly connected with the lifting platform, the safety lock interlock switch is mounted on the transmission device, and the safety lock interlock outputs a switch signal to a safety lock signal input end of the PLC control device.
10. The control system of claim 8, further comprising an electric cabinet, a raise button (2), a lower button (4), a safety reset button (3), an emergency stop button (5), a tri-color indicator light (6), a safety relay and a safety reset relay (KA 10);
the ascending button (2), the descending button (4), the safety reset button (3), the emergency stop button (5) and the touch screen (1) are all arranged on a panel of the electric cabinet, the PLC control device and the safety relay are fixed inside the electric cabinet, and the three-color indicator lamp (6) is arranged at the top of the electric cabinet;
the ascending button (2) outputs an ascending control signal to an ascending control signal input end of the PLC control device, and the descending button (4) outputs a descending control signal to a descending control signal input end of the PLC control device; the PLC control device outputs a signal lamp control signal to the three-color indicator lamp (6);
the safety reset button (3) and a normally closed switch of the safety reset relay (KA10) are connected in series in a return circuit of a reset circuit of the safety relay, the emergency stop button (5) is connected in series in a power supply loop of the safety relay, and a normally open contact of the safety relay and a coil of the safety reset relay are connected in series in the power supply loop.
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| CN202122168762.0U CN215885930U (en) | 2021-09-06 | 2021-09-06 | Lifting platform control system for driving of hoister |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705099A (en) * | 2022-03-24 | 2022-07-05 | 中国国检测试控股集团陕西有限公司 | Standard plate jacking device of ceramic tile size comprehensive determinator |
| CN115576263A (en) * | 2022-11-10 | 2023-01-06 | 中建三局科创产业发展有限公司 | Electrical control system and method for guide frame climbing platform |
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2021
- 2021-09-06 CN CN202122168762.0U patent/CN215885930U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114705099A (en) * | 2022-03-24 | 2022-07-05 | 中国国检测试控股集团陕西有限公司 | Standard plate jacking device of ceramic tile size comprehensive determinator |
| CN114705099B (en) * | 2022-03-24 | 2024-05-28 | 中国国检测试控股集团陕西有限公司 | Standard plate jacking device of ceramic tile size comprehensive tester |
| CN115576263A (en) * | 2022-11-10 | 2023-01-06 | 中建三局科创产业发展有限公司 | Electrical control system and method for guide frame climbing platform |
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