CN110683475A - Control system and limiting control method for hoisting limiting mechanism - Google Patents
Control system and limiting control method for hoisting limiting mechanism Download PDFInfo
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- CN110683475A CN110683475A CN201910987923.3A CN201910987923A CN110683475A CN 110683475 A CN110683475 A CN 110683475A CN 201910987923 A CN201910987923 A CN 201910987923A CN 110683475 A CN110683475 A CN 110683475A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000006698 induction Effects 0.000 claims description 53
- 230000001360 synchronised effect Effects 0.000 claims description 23
- 230000001939 inductive effect Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/54—Safety gear
- B66D1/56—Adaptations of limit switches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/48—Control devices automatic
- B66D1/485—Control devices automatic electrical
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Abstract
The invention discloses a control system of a hoisting limit mechanism, which comprises a limit mechanism fixing main body and at least one hoisting limit mechanism arranged on the limit mechanism fixing main body, and also comprises a limit automatic control system which is in communication connection with each hoisting limit mechanism and is used for controlling a hoisting hook in each hoisting limit mechanism to stably retract to an initial stop position, wherein a plurality of sensing distances are arranged between a sensing block and a proximity switch in the hoisting limit mechanism, and the invention can control the hoisting hook to slowly retract to the initial stop position by sensing signals sequentially detected by the proximity switch, thereby not only avoiding the over-winding phenomenon easily occurring in the retraction process of the hoisting hook, but also reducing the retraction speed of the hoisting hook after the hoisting hook enters a guide groove of the hoisting limit mechanism, it is ensured that the hook is smoothly retracted and finally stays at the initial rest position.
Description
Technical Field
The invention relates to the technical field of machine manufacturing, in particular to a control system and a limit control method for a hoisting limit mechanism.
Background
As shown in fig. 1, in order to prevent the hook 100 from being overwound during the retraction process, a proximity switch 200 is disposed on the winding limiting mechanism, and a sensing device (not shown) is disposed on the hook 100, when the hook 100 retracts into a guide slot 300 of the winding limiting mechanism, the proximity switch 200 senses the sensing device to generate a sensing signal, the proximity switch 200 sends the sensing signal to a control system of the winding itself, and the control system of the winding itself immediately cuts off the retraction of the hook 100 after receiving the sensing signal, so that the hook 100 stays at the initial stop position.
However, the above-described hook retraction control method has two technical problems:
firstly, if the hook 100 is shaken by external force impact after being retracted into the guide groove 300, the proximity switch 200 may not timely sense the hook 100, and cannot send a retraction cut-off signal to a control system of the winch itself, and the hook 100 cannot timely cut off retraction movement to cause overwinding;
secondly, due to the inertia effect, after a control system of the winch receives the induction signal, the control system immediately cuts off the retraction action of the lifting hook, so that the lifting hook 100 shakes violently, and certain potential safety hazards exist.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a control system for a hoisting limiting mechanism, so as to solve the above technical problems.
The technical proposal adopted by the invention for solving the technical problem is to provide a control system of a hoisting limit mechanism, which comprises a limit mechanism fixing main body and at least one hoisting limit mechanism arranged on the limit mechanism fixing main body,
every hoist stop gear includes:
a fixed seat, the fixed seat is fixedly arranged on a first designated position of the fixed main body of the limiting mechanism,
the telescopic seat is arranged on the fixed seat, is controlled by a control system of a winch in the winch limiting mechanism and can reciprocate up and down relative to the fixed seat;
the winch realizes vertical reciprocating motion by tensioning the lifting hook of the steel wire rope and the telescopic seat;
the guide groove is arranged at a second appointed position of the limiting mechanism fixing main body; the lifting hook of the winch is clamped into the guide groove through a clamping piece, and when the lifting hook of the winch retracts into the guide groove, the winch retracts upwards in the guide groove along with the telescopic seat;
the induction block is arranged on the telescopic seat and can reciprocate up and down along with the telescopic seat;
the proximity switch is arranged at the designated position of the fixed seat and used for sensing the sensing block and generating a sensing signal after sensing the sensing block and sending the sensing signal to a limit automatic control system;
hoist stop gear control system still includes:
and the limiting automatic control system is used for controlling the hoisting hook to stably retract to an initial stopping position.
As a preferable aspect of the present invention, a first sensing distance and a second sensing distance are provided between the sensing block and the proximity switch.
As a preferable scheme of the present invention, the sensing distance between the sensing block and the proximity switch is adjustable.
In a preferred embodiment of the present invention, the proximity switch is an analog proximity switch.
As a preferable scheme of the present invention, the automatic limit control system includes:
the PLC is in communication connection with at least one remote control handle, and the remote control handle is used for controlling the lifting hook corresponding to the winch to perform telescopic action;
the synchronous/asynchronous control switch is in communication connection with the PLC controller and is used for providing a user with control over the lifting hooks of the winches to execute the telescopic action in a synchronous or asynchronous working mode;
the PLC is also in communication connection with each proximity switch, when the proximity switches sense a first sensing signal, the PLC obtains the current real-time opening value of the remote control handle at the corresponding remote control handle, then based on a sensing current value corresponding to the first sensing signal and the real-time opening value of the remote control handle, the PLC calculates the control quantity required by the corresponding lifting hook of the winch to continue to perform retraction action, generates a corresponding control signal based on the control quantity and sends the control signal to the corresponding control system of the winch, and the control system of the winch reduces the retraction speed of the lifting hook according to the received control signal and continues to perform retraction action;
when the proximity switch senses a second sensing signal, the PLC sends a retraction cut-off signal to the control system of the corresponding winch, and the control system of the winch cuts off the retraction action of the lifting hook according to the received retraction cut-off signal, so that the lifting hook finally returns to the initial stop position.
As a preferred aspect of the present invention, the PLC controller specifically includes:
the inductive signal receiving unit is used for receiving and outputting the first inductive signal and the second inductive signal which are sent by each proximity switch in sequence;
the remote control handle real-time opening value acquisition unit is connected with the induction signal receiving unit and is used for acquiring the real-time opening value of the remote control handle at the moment at the position of the remote control handle correspondingly controlling the winch after the induction signal receiving unit receives the first induction signal;
the induction value identification unit is connected with the induction signal receiving unit and used for identifying the induction current value corresponding to the first induction signal;
the lifting hook continuous retraction control quantity calculation unit is respectively connected with the remote control handle real-time opening value acquisition unit and the induction value identification unit and is used for calculating an ideal opening value of the remote control handle when the lifting hook in the winch continuously executes retraction action on the basis of the induction current value corresponding to the first induction signal and the corresponding real-time opening value of the remote control handle;
the control signal generating unit is connected with the lifting hook continuous retraction control quantity calculating unit and used for taking the ideal opening value as the control quantity when the lifting hook in the corresponding winch continuously executes the retraction action and generating the corresponding control signal based on the control quantity;
the control signal sending unit is connected with the control signal generating unit and used for sending the control signal to the control system of the corresponding winch;
and the retraction cut-off signal generating and sending unit is connected with the sensing signal receiving unit and is used for generating the retraction cut-off signal according to the second sensing signal sent by the sensing signal receiving unit and sending the retraction cut-off signal to the corresponding control system of the winch per se.
As a preferred embodiment of the present invention, the ideal opening value is calculated by the following formula:
H=（20-I）*h/16；
in the above formula, H is used to represent the ideal opening value;
i is used for representing the induction current value corresponding to the first induction signal induced by the proximity switch;
h is used for representing the real-time opening value of the remote control handle acquired at the corresponding remote control handle after the PLC receives the first induction signal.
In a preferred embodiment of the present invention, the PLC controller is model EPEC 3724.
The invention also provides a control method of the hoisting limiting mechanism, which is realized by applying the control system of the hoisting limiting mechanism, the control method of the hoisting limiting mechanism comprises an asynchronous control method of the hoisting limiting mechanism, and the asynchronous control method of the hoisting limiting mechanism specifically comprises the following steps:
step S1, the user puts the synchronous/asynchronous control switch into 'asynchronous' control state;
step S2, the user respectively and independently controls the lifting hooks of the winch to respectively execute the telescopic action through different remote control handles;
step S3, after each proximity switch senses the first sensing signal, the PLC controller obtains the real-time opening value of the remote control handle at the moment at the corresponding remote control handle after receiving the first sensing signal sent by each proximity switch;
step S4, the PLC calculates the ideal opening value needed by the corresponding remote control handle when the corresponding lifting hook of the winch continues to perform retraction action based on the induction current value corresponding to the first induction signal and the real-time opening value of the corresponding remote control handle;
step S5, the PLC takes each ideal opening value as the control quantity needed when the lifting hook in the corresponding winch continues to perform the retracting action, and generates the corresponding control signal based on the control quantity;
step S6, the PLC sends the control signal to the control system of the corresponding winch, and the control system of each winch controls the lifting hook in the corresponding winch to reduce the retraction speed and continue to execute the retraction action according to the received control signal;
step S7, after each proximity switch senses the second sensing signal, the PLC controller generates the retraction cutoff signal after receiving the second sensing signal sent by each proximity switch, and sends the retraction cutoff signal to the corresponding control system of the winch itself, and the control system of the winch itself cuts off the retraction motion of the hook according to the received retraction cutoff signal, so that the hook finally returns to the initial stopping position.
As a preferable scheme of the present invention, the method for controlling the hoisting limiting mechanism further comprises a method for synchronously controlling the hoisting limiting mechanism, and the method for synchronously controlling the hoisting limiting mechanism comprises the following steps:
a step L1, in which the user places the synchronous/asynchronous control switch in the "synchronous" control state;
step L2, the user uses any remote control handle as a control handle and controls the lifting hook of the winch in each winch limiting mechanism to synchronously execute the telescopic action through the control handle;
step L3, when any one of the proximity switches senses the first sensing signal, the PLC controller obtains the real-time opening value of the manipulation handle at the time at the manipulation handle after receiving the sensing signal sent by each proximity switch;
step L4, the PLC calculates the ideal opening value of the control handle when the hook in each winch continues to perform retraction based on the induction current value corresponding to the first induction signal and the real-time opening value of the control handle;
step L5, the PLC controller takes the rational opening value as the control quantity needed when the lifting hook in each winch continues to perform the retracting action, and generates the corresponding control signal based on the control quantity;
step L6, the PLC sends the control signals to the control systems of the winches at the same time, and the control systems of the winches control the lifting hooks in the corresponding winches to reduce the retraction speed and continue to perform the retraction action according to the received control signals;
and L7, when any proximity switch senses the second sensing signal, the PLC generates the retraction cut-off signal after receiving the second sensing signal sent by the proximity switch, and sends the retraction cut-off signal to the control systems of all the winches, and the control system of each winch simultaneously cuts off the retraction motion of the corresponding hook according to the received retraction cut-off signal, so that the corresponding hook finally returns to the initial stop position at the same time.
The invention provides a hoisting limiting mechanism, wherein a plurality of sensing distances are arranged between a sensing block and a proximity switch, and the hoisting limiting mechanism controls a hoisting lifting hook to slowly retract to an initial stopping position by sequentially sensing signals through the proximity switch, so that the phenomenon of lifting hook overwinding caused by the fact that the proximity switch cannot sense the lifting hook to timely cut off the retraction of the lifting hook due to shaking caused by external force impact in the retraction process of the lifting hook can be reduced. Meanwhile, after the control system of the hoisting limiting mechanism provided by the invention senses that the lifting hook retracts into the guide groove, the retraction action of the lifting hook cannot be immediately cut off, and the stability of the lifting hook in the retraction process can be ensured by reducing the retraction speed of the lifting hook and finally retracting the lifting hook to the initial stop position.
Drawings
Fig. 1 is a schematic structural diagram of a hoisting limit mechanism in the prior art;
fig. 2 is a schematic perspective view of a double-winding limiting mechanism according to an embodiment of the present invention;
fig. 3 is a side view of a hoisting limit mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an automatic limit control system according to an embodiment of the present invention;
FIG. 5 is a diagram of the sensing relationship of a proximity switch and a sensing block;
fig. 6 is a schematic internal structural diagram of a PLC controller in a hoisting limiting mechanism control system according to an embodiment of the present invention;
fig. 7 is a diagram of a method step for implementing asynchronous control of a hoisting limiting mechanism by applying a control system of the hoisting limiting mechanism provided by an embodiment of the invention;
fig. 8 is a flowchart of a method for implementing synchronous control of a hoisting limiting mechanism by using a hoisting limiting mechanism control system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 2 and 3, the hoisting limiting mechanism control system according to an embodiment of the present invention includes a limiting mechanism fixing body 400 and at least one hoisting limiting mechanism disposed on the limiting mechanism fixing body 400,
referring to fig. 3, each hoisting limit mechanism includes:
a fixed seat 1, the fixed seat 1 is fixedly arranged on a first designated position 401 of the limiting mechanism fixing main body 400,
the telescopic seat 2 is arranged on the fixed seat 1, the telescopic seat 2 is controlled by a control system of a winch in the winch limiting mechanism, and the telescopic seat 2 can reciprocate up and down relative to the fixed seat 1;
the winch 3 is tensioned with the lifting hook 32 on the steel wire rope and the telescopic base 2 to realize vertical reciprocating motion;
a guide groove 4, the guide groove 4 is disposed at a second designated position 402 of the limiting mechanism fixing body 400, referring to fig. 2, the hook 32 of the winch 3 is clamped into the guide groove 4 through a clamping member 31, and when the hook 32 of the winch 3 retracts into the guide groove 4, the winch 3 retracts upwards in the guide groove 4 along with the telescopic base 2;
an induction block 5, please refer to fig. 3 and 5, the induction block 5 is arranged on the telescopic base 2 and can reciprocate up and down along with the telescopic base 2;
the proximity switch 6 is arranged at the designated position of the fixed seat 1 and is used for sensing the sensing block 5, generating a sensing signal after sensing the sensing block 5 and sending the sensing signal to a limit automatic control system;
referring to fig. 4, the hoisting limiting mechanism control system further includes:
and the automatic limit control system is used for controlling the lifting hook 32 of the winch 3 to stably retract to the initial stop position.
Referring to fig. 5, a first sensing distance and a second sensing distance are provided between the sensing block 5 and the proximity switch 6. When the proximity switch 6 senses the first sensing distance, it represents that the hook 32 has entered the guide groove 4. When the proximity switch 6 senses the second sensing distance, the limit automatic control system sends a retraction cut-off signal to the control system of the winch 3, the control system of the winch 3 immediately cuts off the retraction motion of the hook 32, and at the moment, the hook 32 is just stopped at the initial stopping position finally.
In order to ensure that the hook 32 can be smoothly retracted to the final initial rest position, the sensing distance between the sensing block 5 and the proximity switch 6 is preferably adjustable. The user can adjust the sensing distance between the sensing block 5 and the proximity switch 6 according to actual requirements.
In the above technical solution, the proximity switch 6 is preferably an analog proximity switch, and the analog proximity switch includes a current output type analog proximity switch and a voltage output type analog proximity switch. The analog proximity switch is preferably an analog preference switch having the model number schneider XS4P30AB 120.
In the above technical solution, the sensing block 5 is a bent steel plate, the bending height is determined according to the model selection of the analog proximity switch, and taking schneider XS4P30AB120 as an example, the bending height is: 15-1.5=13.5 mm.
Referring to fig. 4, the automatic limit control system includes:
the PLC 10 is in communication connection with at least one remote control handle 20, and the remote control handle 20 is used for controlling a lifting hook 32 corresponding to the winch 3 to perform telescopic action;
a synchronous/asynchronous control switch 30, communicatively connected to the PLC controller 10, for providing a user with control over the hook 32 of each hoist 3 to perform a telescopic motion in a synchronous or asynchronous working manner;
the PLC 10 is also in communication connection with each proximity switch 6, when the proximity switch 6 senses a first sensing signal, the PLC 10 obtains a current real-time opening value of the remote control handle 20 at the corresponding remote control handle 20, then based on a sensing current value corresponding to the first sensing signal and the real-time opening value of the remote control handle 20, calculates a control quantity required when the lifting hook 32 of the corresponding winch 3 continues to perform retraction action, generates a corresponding control signal based on the control quantity and sends the control signal to a control system 33 of the corresponding winch 3, and the control system 33 of the winch 3 reduces the retraction speed of the lifting hook 32 according to the received control signal and continues to perform retraction action;
when the proximity switch 6 senses the second sensing signal, the PLC controller 10 sends a retraction cut-off signal to the corresponding control system 33 of the winch 3 itself, and the control system 33 of the winch 3 cuts off the retraction motion of the hook 32 according to the received retraction cut-off signal, so that the hook 32 finally returns to the initial stop position.
With particular reference to figure 6 of the drawings,
the PLC controller 10 specifically includes:
the sensing signal receiving unit 101 is configured to receive and output a first sensing signal and a second sensing signal which are successively sent by each proximity switch 6;
the remote control handle real-time opening value acquisition unit 102 is connected with the induction signal receiving unit 101, and is used for acquiring the real-time opening value of the remote control handle 20 at the time at the position of the remote control handle 20 corresponding to the winch 3 for controlling the winch to work after the induction signal receiving unit 101 receives the first induction signal;
the induction value identification unit 103 is connected with the induction signal receiving unit 101 and is used for identifying an induction current value corresponding to the first induction signal;
the lifting hook continuous retraction control quantity calculation unit 104 is respectively connected with the remote control handle real-time opening value acquisition unit 102 and the induction value identification unit 103, and is used for calculating an ideal opening value required by the remote control handle 20 when the lifting hook 32 in the corresponding winch 3 continuously performs retraction action based on the induction current value corresponding to the first induction signal and the corresponding real-time opening value of the remote control handle 20;
a control signal generation unit 105 connected to the hook continuous retraction control amount calculation unit 104, for setting the ideal opening value as a control amount when the hook 32 in the corresponding hoist 3 continues to perform the retraction operation, and generating a corresponding control signal based on the control amount;
a control signal sending unit 106 connected to the control signal generating unit 105, for sending the control signal to the control system 33 corresponding to the winch 3, wherein the control system 33 of the winch 3 reduces the retraction speed of the hook 32 according to the received control signal and continues to perform the retraction operation;
and the retraction cut-off signal generation unit 107 is connected with the sensing signal receiving unit 101, and is used for generating a retraction cut-off signal according to the second sensing signal sent by the sensing signal receiving unit 101 and sending the retraction cut-off signal to the corresponding control system 33 of the winch 3, and the control system 33 of the winch 3 cuts off the retraction action of the hook 32 according to the received retraction cut-off signal, so that the hook 32 finally returns to the initial stop position.
In the above technical solution, the calculation of the ideal opening value required by the PLC controller for the remote control handle 20 is calculated by the following formula:
H=（20-I）*h/16；
in the above formula, H is used to represent the ideal opening value to be calculated;
i is used for representing the induction current value corresponding to the first induction signal induced by the proximity switch 6;
h is used for indicating the real-time opening value of the remote control handle 20 acquired by the PLC controller 10 at the corresponding remote control handle 20 after receiving the first sensing signal.
In the above technical solution, the PLC controller 10 is preferably a controller with the model number EPEC 3724.
The invention takes two hoisting limit mechanisms as an example, and describes in detail the retraction process of the two lifting hooks controlled by the hoisting limit mechanism control system provided by the embodiment as follows:
referring to fig. 2, the two hoisting limiting mechanisms are a left hoisting limiting mechanism and a right hoisting limiting mechanism, respectively. The left hoisting limiting mechanism and the right hoisting limiting mechanism have the same structure. The left hoisting limiting mechanism is arranged on the left side of the limiting mechanism fixing main body 400, and the right hoisting limiting mechanism is arranged on the right side of the limiting mechanism fixing main body 400 relative to the left hoisting limiting mechanism.
Referring to fig. 4, when the user sets the synchronous/asynchronous control switch 30 in the "asynchronous" control state, it indicates that the user wishes to individually control the telescopic actions of the left hoisting limiting mechanism and the right hoisting limiting mechanism, that is, the user can control the telescopic action of the hoisting 3 in the left hoisting limiting mechanism through the left remote control handle, and can control the telescopic action of the hoisting 3 in the right hoisting limiting mechanism through the right remote control handle.
The user can control the lifting hook 32 of the winch 3 in the left winch limiting mechanism to perform retraction through the left remote control handle. Meanwhile, in the retracting action of the hook 32 of the winch 3 in the left winch limiting mechanism, the hook 32 of the winch 3 in the right winch limiting mechanism can be controlled by the right remote control handle to extend or retract.
When the proximity switch 6 in the left winding limiting mechanism senses a first sensing signal (the proximity switch 6 senses the first sensing signal after the lifting hook 32 is set to retract into the guide groove 4 according to the invention), the proximity switch 6 sends the sensed first sensing signal to the PLC controller 10 in the automatic limiting control system. After receiving the first sensing signal sent by the proximity switch 6, the PLC controller 10 obtains the real-time opening value of the left remote control handle at the time at the left remote control handle, however, the PLC controller 10 identifies the sensing current value corresponding to the first sensing signal, and calculates the ideal opening value required by the left remote control handle when the hook 32 of the winch 3 in the left winch limiting mechanism continues to perform retraction based on the sensing current value and the real-time opening value of the left remote control handle;
the PLC controller 10 takes the ideal opening value as a control quantity required when the lifting hook 32 for controlling the winch 3 in the left winch limiting mechanism continues to perform retraction action, and generates a corresponding control signal based on the control quantity;
the PLC controller 10 then sends a control signal to the control system 33 of the hoist 3 itself in the left hoist limiting mechanism, and the hoist control system 33 controls the hook 32 of the hoist 3 to reduce the retracting speed and continue to perform the retracting action according to the received control signal;
when the proximity switch 6 in the left winding limiting mechanism senses the second sensing signal, the PLC controller 10 generates a retraction cut-off signal after receiving the second sensing signal sent by the proximity switch 6, and sends the retraction cut-off signal to the control system 33 of the winding 3 itself in the left winding limiting mechanism, and the control system 33 of the winding 3 itself cuts off the retraction motion of the hook 32 according to the received retraction cut-off signal, so that the hook 32 finally returns to the initial stop position.
Under the asynchronous working state, the retraction mode of the hoisting hook in the right hoisting limiting mechanism is completely the same as that of the hoisting hook in the left hoisting limiting mechanism, and the details are not repeated herein.
In addition, the invention also provides a synchronous control method for the retraction process of the hoisting hook. Similarly, taking the left and right hoisting limit mechanisms as an example, the method for controlling the two hooks 32 to synchronously retract by the hoisting limit mechanism control system provided in this embodiment is briefly described as follows:
the user puts the synchronous/asynchronous control switch 30 in the "synchronous" control state, which indicates that the user wishes to synchronously perform the retracting motion of the hoisting hook 32 in the left hoisting limit mechanism and the hoisting hook 32 in the right hoisting limit mechanism.
Then, the user simultaneously controls the two hoisting hooks 32 to synchronously execute telescopic actions through the left remote control handle or the right remote control handle;
when any one of the proximity switches 6 in the left hoisting limiting mechanism or the right hoisting limiting mechanism senses a first sensing signal, the PLC 10 obtains a real-time opening value of the control handle at the moment at the left remote control handle or the right remote control handle controlled by a user after receiving the first sensing signal sent by any one of the proximity switches 6;
the PLC 10 calculates an ideal opening value of the control handle when the lifting hook 32 in each winch 3 continues to perform retraction action based on the induction current value corresponding to the first induction signal and the real-time opening value of the control handle;
then the PLC controller 10 uses the ideal opening value as a control amount required for controlling the left and right hoisting hooks 32 to continue to perform the retracting action, and generates a corresponding control signal based on the control amount;
the PLC 10 sends the control signal to the control system 33 of the winch 3 in the left winch limiting mechanism and the right winch limiting mechanism at the same time, and the control system 33 of each winch 3 controls the corresponding winch hook 32 to reduce the retraction speed and continue to perform the retraction action according to the received control signal;
when any proximity switch 6 senses the second sensing signal, the PLC controller 10 generates a retraction cut-off signal after receiving the second sensing signal sent by the proximity switch 6, and sends the retraction cut-off signal to the control systems 33 of all the hoists 3, and the control system 33 of each hoist 3 cuts off the retraction motion of the corresponding hook 32 according to the received retraction cut-off signal, so that the corresponding hook 32 is finally and synchronously returned to the initial stop position.
The invention also provides a control method of the hoisting limiting mechanism, which is realized by applying the control system of the hoisting limiting mechanism, the control method of the hoisting limiting mechanism comprises an asynchronous control method of the hoisting limiting mechanism, and please refer to fig. 7, the asynchronous control method of the hoisting limiting mechanism specifically comprises the following steps:
step S1, the user places the synchronous/asynchronous control switch 30 in the "asynchronous" control state;
step S2, the user individually controls the hoisting hook 32 to respectively perform the telescopic action through different remote control handles 20;
step S3, after each proximity switch 6 senses the first sensing signal, the PLC controller 10 obtains the real-time opening value of the remote control handle 20 at the moment at the corresponding remote control handle 20 after receiving the first sensing signal sent by each proximity switch 6;
step S4, the PLC controller 10 calculates an ideal opening value required by the corresponding remote control handle 20 when the hook 32 of the corresponding winch 3 continues to perform the retraction operation, based on the induced current value corresponding to the first induced signal and the real-time opening value of the corresponding remote control handle;
step S5, the PLC controller 10 uses each ideal opening value as a control amount required for controlling the hook 32 in the corresponding hoist 3 to continue the retracting action, and generates a corresponding control signal based on the control amount;
step S6, the PLC controller 10 sends a control signal to the control system 33 of the corresponding hoist 3, and the control system 33 of each hoist 3 controls the hook 32 in the corresponding hoist 3 to reduce the retraction speed and continue to perform the retraction operation according to the received control signal;
in step S7, after the proximity switches 6 sense the second sensing signals, the PLC controller 10 generates retraction cutoff signals after receiving the second sensing signals sent by the proximity switches 6, and sends the retraction cutoff signals to the corresponding control system 33 of the winch 3 itself, and the control system 33 of the winch 3 itself cuts off the retraction motion of the hook 32 according to the received retraction cutoff signals, so that the hook 32 finally returns to the initial stopping position.
The invention also provides a synchronous control method of the hoisting limiting mechanism, and the method specifically comprises the following steps with reference to fig. 8:
step L1, the user places the synchronous/asynchronous control switch 30 in the "synchronous" control state;
step L2, the user uses any remote control handle 20 as a control handle and controls the hoisting hooks 32 in each hoisting limiting mechanism to synchronously perform telescopic action through the control handle;
step L3, when any proximity switch 6 senses the first sensing signal, the PLC controller 10 obtains the real-time opening value of the control handle at the control handle of the user after receiving the sensing signal sent by each proximity switch 6;
step L4, the PLC controller 10 calculates an ideal opening value of the control handle when the hook 32 in each hoist 3 continues to perform the retracting motion based on the induced current value corresponding to the first induced signal and the real-time opening value of the control handle;
l5, the PLC controller 10 uses the ideal opening value as a control amount required for controlling each hoisting hook 32 to continue the retracting action, and generates a corresponding control signal based on the control amount;
in step L6, the PLC controller 10 sends the control signals to the control systems 33 of the hoists 3 at the same time, and the control systems 33 of the hoists 3 control the corresponding hoist hooks 32 to reduce the retraction speed and continue to perform the retraction operation according to the received control signals;
in step L7, when any proximity switch 6 senses the second sensing signal, the PLC controller 10 generates a retraction cutoff signal after receiving the second sensing signal sent by the proximity switch 6, and sends the retraction cutoff signal to the control systems 33 of all the hoists 3, and the control system 33 of each hoist 3 simultaneously cuts off the retraction motion of the corresponding hook 32 according to the received retraction cutoff signal, so that the corresponding hook is finally and synchronously returned to the initial stop position.
In summary, a plurality of sensing distances are arranged between the sensing block and the proximity switch in the hoisting limiting mechanism provided by the invention, the lifting hook can be controlled to slowly retract to the initial stop position through the sensing signals sequentially detected by the proximity switch, the overwinding phenomenon easily occurring in the retraction process of the lifting hook can be avoided, and meanwhile, the stable retraction and final stop of the lifting hook at the initial stop position can be ensured by reducing the retraction speed of the lifting hook after the lifting hook enters the guide groove of the hoisting limiting mechanism.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A control system of a hoisting limiting mechanism is characterized by comprising a limiting mechanism fixing main body and at least one hoisting limiting mechanism arranged on the limiting mechanism fixing main body,
every hoist stop gear includes:
a fixed seat, the fixed seat is fixedly arranged on a first designated position of the fixed main body of the limiting mechanism,
the telescopic seat is arranged on the fixed seat, is controlled by a control system of a winch in the winch limiting mechanism and can reciprocate up and down relative to the fixed seat;
the winch realizes vertical reciprocating motion by tensioning a lifting hook on a steel wire rope and the telescopic seat;
the guide groove is arranged at a second appointed position of the limiting mechanism fixing main body; the lifting hook of the winch is clamped into the guide groove through a clamping piece, and when the lifting hook of the winch retracts into the guide groove, the winch retracts upwards in the guide groove along with the telescopic seat;
the induction block is arranged on the telescopic seat and can reciprocate up and down along with the telescopic seat;
the proximity switch is arranged at the designated position of the fixed seat and used for sensing the sensing block and generating a sensing signal after sensing the sensing block and sending the sensing signal to a limit automatic control system;
hoist stop gear control system still includes:
and the limiting automatic control system is used for controlling the hoisting hook to stably retract to an initial stopping position.
2. The hoisting limit mechanism control system of claim 1, wherein a first sensing distance and a second sensing distance are provided between the sensing block and the proximity switch.
3. The hoisting limit mechanism control system of claim 1, wherein the sensing distance between the sensing block and the proximity switch is adjustable.
4. The hoisting limit mechanism control system of claim 1, wherein the proximity switch is an analog proximity switch.
5. The hoisting limit mechanism control system of claim 1, wherein the automatic limit control system comprises:
the PLC is in communication connection with at least one remote control handle, and the remote control handle is used for controlling the lifting hook corresponding to the winch to perform telescopic action;
the synchronous/asynchronous control switch is in communication connection with the PLC controller and is used for providing a user with control over the lifting hooks of the winches to execute the telescopic action in a synchronous or asynchronous working mode;
the PLC is also in communication connection with each proximity switch, when the proximity switches sense a first sensing signal, the PLC obtains the current real-time opening value of the remote control handle at the corresponding remote control handle, then based on a sensing current value corresponding to the first sensing signal and the real-time opening value of the remote control handle, the PLC calculates the control quantity required by the corresponding lifting hook of the winch to continue to perform retraction action, generates a corresponding control signal based on the control quantity and sends the control signal to the corresponding control system of the winch, and the control system of the winch reduces the retraction speed of the lifting hook according to the received control signal and continues to perform retraction action;
when the proximity switch senses a second sensing signal, the PLC sends a retraction cut-off signal to the control system of the corresponding winch, and the control system of the winch cuts off the retraction action of the lifting hook according to the received retraction cut-off signal, so that the lifting hook finally returns to the initial stop position.
6. The hoisting limiting mechanism control system according to claim 5, wherein the PLC controller specifically comprises:
the inductive signal receiving unit is used for receiving and outputting the first inductive signal and the second inductive signal which are sent by each proximity switch in sequence;
the remote control handle real-time opening value acquisition unit is connected with the induction signal receiving unit and is used for acquiring the real-time opening value of the remote control handle at the moment at the position of the remote control handle correspondingly controlling the winch after the induction signal receiving unit receives the first induction signal;
the induction value identification unit is connected with the induction signal receiving unit and used for identifying the induction current value corresponding to the first induction signal;
the lifting hook continuous retraction control quantity calculation unit is respectively connected with the remote control handle real-time opening value acquisition unit and the induction value identification unit and is used for calculating an ideal opening value of the remote control handle when the lifting hook in the winch continuously executes retraction action on the basis of the induction current value corresponding to the first induction signal and the corresponding real-time opening value of the remote control handle;
the control signal generating unit is connected with the lifting hook continuous retraction control quantity calculating unit and used for taking the ideal opening value as the control quantity when the lifting hook in the corresponding winch continuously executes the retraction action and generating the corresponding control signal based on the control quantity;
the control signal sending unit is connected with the control signal generating unit and used for sending the control signal to the control system of the corresponding winch;
and the retraction cut-off signal generating and sending unit is connected with the sensing signal receiving unit and is used for generating the retraction cut-off signal according to the second sensing signal sent by the sensing signal receiving unit and sending the retraction cut-off signal to the corresponding control system of the winch per se.
7. The hoisting limit mechanism control system of claim 6, wherein the ideal opening value is calculated by the following formula:
H=（20-I）*h/16；
in the above formula, H is used to represent the ideal opening value;
i is used for representing the induction current value corresponding to the first induction signal induced by the proximity switch;
h is used for representing the real-time opening value of the remote control handle acquired at the corresponding remote control handle after the PLC receives the first induction signal.
8. The control system of claim 1, wherein the PLC controller is of the EPEC3724 type.
9. A control method of a hoisting limiting mechanism is realized by applying the control system of the hoisting limiting mechanism according to any one of claims 5 to 8, and is characterized in that the control method of the hoisting limiting mechanism comprises an asynchronous control method of the hoisting limiting mechanism, and the asynchronous control method of the hoisting limiting mechanism specifically comprises the following steps:
step S1, the user puts the synchronous/asynchronous control switch into 'asynchronous' control state;
step S2, the user respectively and independently controls the lifting hooks of the winch to respectively execute the telescopic action through different remote control handles;
step S3, after each proximity switch senses the first sensing signal, the PLC controller obtains the real-time opening value of the remote control handle at the moment at the corresponding remote control handle after receiving the first sensing signal sent by each proximity switch;
step S4, the PLC calculates the ideal opening value needed by the corresponding remote control handle when the corresponding lifting hook of the winch continues to perform retraction action based on the induction current value corresponding to the first induction signal and the real-time opening value of the corresponding remote control handle;
step S5, the PLC takes each ideal opening value as the control quantity needed when the lifting hook in the corresponding winch continues to perform the retracting action, and generates the corresponding control signal based on the control quantity;
step S6, the PLC sends the control signal to the control system of the corresponding winch, and the control system of each winch controls the lifting hook in the corresponding winch to reduce the retraction speed and continue to execute the retraction action according to the received control signal;
step S7, after each proximity switch senses the second sensing signal, the PLC controller generates the retraction cutoff signal after receiving the second sensing signal sent by each proximity switch, and sends the retraction cutoff signal to the corresponding control system of the winch itself, and the control system of the winch itself cuts off the retraction motion of the hook according to the received retraction cutoff signal, so that the hook finally returns to the initial stopping position.
10. The hoisting limit mechanism control method according to claim 9, further comprising a hoisting limit mechanism synchronous control method, the hoisting limit mechanism synchronous control method comprising the steps of:
a step L1, in which the user places the synchronous/asynchronous control switch in the "synchronous" control state;
step L2, the user uses any remote control handle as a control handle and controls the lifting hook of the winch in each winch limiting mechanism to synchronously execute the telescopic action through the control handle;
step L3, when any one of the proximity switches senses the first sensing signal, the PLC controller obtains the real-time opening value of the manipulation handle at the time at the manipulation handle after receiving the sensing signal sent by each proximity switch;
step L4, the PLC calculates the ideal opening value of the control handle when the hook in each winch continues to perform retraction based on the induction current value corresponding to the first induction signal and the real-time opening value of the control handle;
step L5, the PLC controller takes the rational opening value as the control quantity needed when the lifting hook in each winch continues to perform the retracting action, and generates the corresponding control signal based on the control quantity;
step L6, the PLC sends the control signals to the control systems of the winches at the same time, and the control systems of the winches control the lifting hooks in the corresponding winches to reduce the retraction speed and continue to perform the retraction action according to the received control signals;
and L7, when any proximity switch senses the second sensing signal, the PLC generates the retraction cut-off signal after receiving the second sensing signal sent by the proximity switch, and sends the retraction cut-off signal to the control systems of all the winches, and the control system of each winch simultaneously cuts off the retraction motion of the corresponding hook according to the received retraction cut-off signal, so that the corresponding hook finally returns to the initial stop position at the same time.
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| CN207608260U (en) * | 2017-12-08 | 2018-07-13 | 安徽华尔泰化工股份有限公司 | A kind of electric block upper limit interlock |
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| CN2101662U (en) * | 1991-09-05 | 1992-04-15 | 王松 | Limit device for hoist |
| CN200988746Y (en) * | 2006-10-30 | 2007-12-12 | 湖南华菱涟源钢铁有限公司 | Limit protection device for hoisting equipment |
| CN202754735U (en) * | 2012-06-23 | 2013-02-27 | 徐州市龙泰煤矿设备制造厂 | Novel hanging hook limiting device |
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