CN117623125A - Lifting double-brake control circuit, control method and crane - Google Patents
Lifting double-brake control circuit, control method and crane Download PDFInfo
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- CN117623125A CN117623125A CN202311669970.6A CN202311669970A CN117623125A CN 117623125 A CN117623125 A CN 117623125A CN 202311669970 A CN202311669970 A CN 202311669970A CN 117623125 A CN117623125 A CN 117623125A
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- 238000001514 detection method Methods 0.000 claims abstract description 18
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- 238000005265 energy consumption Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
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Abstract
The application provides a lifting double-brake control circuit, a control method and a crane, wherein the control circuit comprises a frequency converter, a brake, a lifting motor and a main control loop which are connected, the main control loop also comprises a second brake circuit and a double-brake delay detection circuit which are connected with a first brake circuit in parallel, the first brake circuit and the second brake circuit are connected with the frequency converter, and a main controller acts the frequency converter and the brake to perform double braking so as to brake the lifting motor; the double-brake delay detection circuit detects the first brake circuit and the second brake circuit, and controls the main lifting circuit and the main lowering circuit to be disconnected to cut off given signals in response to the detected inconsistent states of the first brake circuit and the second brake circuit, and the frequency converter controls the lifting motor to brake. The double braking contactor is adopted for control, and the frequency converter and the brake are used for double braking, so that the lifting mechanism has the quick and stable stopping capability and has the braking performance which is safer and more reliable.
Description
Technical Field
The application belongs to the technical field of cranes, and particularly relates to a lifting double-brake control circuit, a control method and a crane.
Background
The existing bridge type lifting equipment mostly uses a mode of inputting a main command controller and driving a motor by a frequency converter to operate, and most of the bridge type lifting equipment is used in a high-temperature and high-vibration environment, so that faults such as contact adhesion and the like of a contactor are caused frequently. The main controller is frequently used and is easy to have faults such as zero locking offset, broken wire of a potentiometer and the like, and the main controller can not be closed due to zero locking offset, broken wire of the potentiometer and adhesion of a contactor, so that phenomena such as hook sliding, car sliding and object hanging falling are caused, casualties are easy to cause, and serious economic loss is brought to enterprises.
Disclosure of Invention
In view of this, the application aims at providing a lifting double-brake control circuit, a control method and a crane, so as to solve the problems that the main controller is easy to have faults such as zero locking offset, broken wire of a potentiometer and the like, and the faults can cause the phenomenon that a brake cannot be closed, and the phenomena such as slipping of hooks, slipping of vehicles and dropping of suspended objects occur.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
in a first aspect, the present application provides a lifting double-brake control circuit, including a frequency converter, a brake, a lifting motor and a main control loop that are connected, where the main control loop includes a zero line, a main lifting contactor line, a main lifting line, a main lowering line and a first brake line that are connected in parallel between a first common line and a second common line, and a main command controller is provided on the main control loop, and the main command controller is connected to the zero line, the main lifting line, the main lowering line and the first brake line respectively;
the main control loop further comprises a second braking circuit and a double braking delay detection circuit which are connected with the first braking circuit in parallel, the first braking circuit and the second braking circuit are connected with the frequency converter, and the main command controller acts to control the frequency converter and the brake to perform double braking so as to brake the lifting motor;
the double-brake delay detection circuit detects the first brake circuit and the second brake circuit, the main lifting circuit and the main lowering circuit are controlled to be disconnected in response to the fact that the detected states of the first brake circuit and the detected states of the second brake circuit are inconsistent, given signals are cut off, and the frequency converter controls the lifting motor to brake.
In a second aspect, the present application further provides a lifting double-brake control method, according to the first aspect, the lifting double-brake control circuit includes:
the double-brake delay detection circuit detects states of the coil KM02 and the coil KM03 in real time, and responds to the fact that the attraction states of the contactor KM02 and the contactor KM03 are inconsistent and exceed a preset time, the power-off delay normally open auxiliary contact of the delay relay-KT 02 is disconnected, a given signal is cut off, the frequency converter controls the lifting motor to brake, and meanwhile the band-type brake is closed to mechanically brake.
In a third aspect, the present application also provides a crane comprising a lifting double brake control circuit as described in the first aspect.
Compared with the prior art, the lifting double-brake control circuit, the control method and the crane have the following beneficial effects:
according to the lifting double-brake control circuit, the control method and the crane, the master controller is controlled to act through the first brake circuit, the second brake circuit and the double-brake delay detection circuit which are connected in parallel, the double-brake delay detection circuit detects the first brake circuit and the second brake circuit, and the frequency converter and the brake are controlled to double-brake in response to the detected inconsistent states of the first brake circuit and the second brake circuit so as to brake the lifting motor. The double braking contactor is adopted for control, and the frequency converter and the brake are used for double braking, so that the lifting mechanism has the quick and stable stopping capability, the braking performance is safer and more reliable, the problems that the contact adhesion and the like occur in the conventional lifting equipment due to the contactor are solved, and the phenomena of hook sliding, car sliding and object hanging falling are avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a circuit diagram of a main control loop according to an embodiment of the present application;
fig. 2 is a circuit diagram of a frequency converter according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a lifting motor according to an embodiment of the present application;
FIG. 4 is a graph of the actual rotational speed of a measured hoist motor for a conventional single brake encoder according to an embodiment of the present application;
fig. 5 is a graph of actual rotational speed of a lifting motor measured by a lifting double brake encoder according to another embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Referring to fig. 1 to 3, the present embodiment provides a lifting double-brake control circuit, which includes a frequency converter, a brake, a lifting motor and a main control loop connected to each other, wherein the main control loop includes a zero line, a main lifting contactor line, a main lifting line, a main lowering line and a first brake line connected in parallel between a first common line and a second common line, the main control loop is provided with a main command controller, and the main command controller is respectively connected to the zero line, the main lifting line, the main lowering line and the first brake line;
the main control loop also comprises a second braking circuit and a double braking delay detection circuit which are connected in parallel with the first braking circuit, the first braking circuit and the second braking circuit are connected with the frequency converter, and the main controller acts to control the frequency converter and the brake to perform double braking so as to brake the lifting motor;
the double-brake delay detection circuit detects the first brake circuit and the second brake circuit, and controls the main lifting circuit and the main lowering circuit to be disconnected to cut off given signals in response to the detected inconsistent states of the first brake circuit and the second brake circuit, and the frequency converter controls the lifting motor to brake.
Specifically, in this embodiment, based on the existing lifting double-brake control circuit, the present application controls the master controller to act through the first brake line, the second brake line and the double-brake delay detection line connected in parallel, the double-brake delay detection line detects the first brake line and the second brake line, and controls the frequency converter and the brake to perform double braking in response to the detected state inconsistency of the first brake line and the second brake line, so as to brake the lifting motor. The double braking contactor is adopted for control, and the frequency converter and the brake are used for double braking, so that the lifting mechanism has the quick and stable stopping capability, the braking performance is safer and more reliable, the problems that the contact adhesion and the like occur in the conventional lifting equipment due to the contactor are solved, and the phenomena of hook sliding, car sliding and object hanging falling are avoided.
In some embodiments, as shown in fig. 1, the master controller has a plurality of normally open auxiliary contacts (including zero position normally open auxiliary contact = 05-s17:1, = 05-s17:2; rising normally open auxiliary contact = 05-s17:3, = 05-s17:4; falling normally open auxiliary contact = 05-s17:5, = 05-s17:6; non-zero position normally open auxiliary contact = 05-s17:7, = 05-s17:8);
the main lifting contactor circuit comprises a coil KM00, one end of the coil KM00 is connected to a second public line, and the other end of the coil KM00 is sequentially connected with normally open contacts of two relays KA00 and is connected with a first common line;
the zero line comprises a coil KA05, one end of the coil KA05 passing through the master controller = 05-S17: 1. =05-S17: a 2 contact connected to the first common line and the other end connected to a second common line;
the main lifting line comprises a normally closed auxiliary contact of a lifting limiter=05-F01, a normally closed auxiliary contact of a limit switch=05-S50, a normally closed auxiliary contact of a relay-KA 02, and a coil KA01, wherein one end of the coil KA01 is connected with a second common line, and the other end of the coil KA01 is connected with the limit switch=05-S50 through the normally closed auxiliary contact of the relay-KA 02: 2 contacts, limit switch = 05-S50: the 1 contact is connected with a normally closed auxiliary contact of the lifting weight limiter=05-F01, and the normally closed auxiliary contact of the lifting weight limiter=05-F01 is connected with a main command controller=05-S17: 4 contacts, master controller = 05-S17: the 3 contact is connected with the first common line through a power-off time-delay normally-open auxiliary contact of the time-delay relay-KT 02;
a normally open auxiliary contact of the contactor-KM 00 is arranged on a first public line between the zero line and the main rising line;
the main circuit that falls includes relay-KA 01 'S normal close auxiliary contact and coil KA02, and the second common line is connected to the one end of coil KA02, and limit switch = 05-S50 is connected through relay-KA 01' S normal close auxiliary contact to the other end of coil KA02 = 05-S50:4 contacts, limit switch = 05-S50:3 contacts connect master controller = 05-S17:6 contacts, master controller = 05-S17: the 5 contacts are connected with a power-off delay normally open auxiliary contact of the delay relay-KT 02.
In some embodiments, as shown in fig. 1, the first brake line includes a coil KM02, one end of the coil KM02 is connected to the second common line, and the other end is connected to XR01 of the inverter=05-U1: 3 contacts, XR01 of transducer = 05-U1: the 2 contacts are connected with the first common line;
the second brake circuit comprises a coil KM03 connected between the first common line and the second common line, a normally open auxiliary contact of a relay KA06, a normally closed auxiliary contact of a relay KA05, a normally open auxiliary contact of a digital quantity output relay of a frequency converter XRO3 and a normally open auxiliary contact = 05-S17 of a master controller: 7-8;
one end of the coil KM03 is connected to a second common line, and the other end thereof is connected to a normally open auxiliary contact of the relay KA06, the normally open auxiliary contact is connected to a normally closed auxiliary contact of the relay KA05, and the normally closed auxiliary contact of the relay KA05 is connected to = 05-S17 of the main controller: 8 contacts, master controller = 05-S17: the 7 contacts are connected to the first common line.
Specifically, for the second brake line, after the start button=01-S1 set on the zero line is pressed, the control loop lifts the main contactor KM00 (coil) to be attracted, the normally open auxiliary contact of KM00 is closed, 0501 and 0503 are conducted, 0503 in the main lifting control cabinet changes the non-zero position of the main command=05-S17 into 0504, =05-S17 by the control cable: 7 and = 05-S17:8 is a non-zero normally open point (closed), 0504 is changed into 0536 through a normally open point of a digital output point XR03 of a frequency converter=05-U1, XR03:2 and XR03: and 3 is a digital output normally open contact of the frequency converter, the normally closed point of the 0536 entering the zero relay KA05 is changed into 0537, the normally open point of the 0537 entering the overspeed relay KA06 is changed into 0510 (overspeed loop conduction), 0510 controls the braking 2 coil KM03 to be attracted, and the second braking circuit is conducted.
In some embodiments, as shown in fig. 1, the dual-brake delay detection circuit includes a delay coil KT02, where the delay coil KT02 is connected to the first common line through a normally open auxiliary contact of a contactor KM03 and a normally open auxiliary contact of the contactor KM02 connected in series;
the delay coil KT02 is also connected with the first common line through a normally closed auxiliary contact of a contactor KM03 and a normally closed auxiliary contact of the contactor KM02 which are connected in series.
Based on the same inventive concept, corresponding to the circuit of any embodiment, the embodiment of the application further provides a lifting double-brake control method, which comprises the following steps:
the double-brake delay detection circuit detects states of the coil KM02 and the coil KM03 in real time, and responds to the fact that the attraction states of the contactor KM02 and the contactor KM03 are inconsistent and exceed a preset time, the power-off delay normally open auxiliary contact of the delay relay-KT 02 is disconnected, a given signal is cut off, the frequency converter controls the lifting motor to brake, and meanwhile the band-type brake is closed to mechanically brake.
Specifically, the dual-brake delay detection circuit detects the states of the coils of KM02 and KM03 in real time, under normal conditions, the two contactors are simultaneously attracted or disconnected, the outage delay relay KT02 is in an attracted state, when the inconsistent attraction states of the two KM02 and KM03 exceed 1S, normally open auxiliary contacts of the delay relay KT02 in the main lifting circuit and the main falling circuit are disconnected, given signals are cut off, the frequency converter controls the motor to brake, and meanwhile, the band-type brake is closed to mechanically brake, so that the motor is prevented from being locked due to the fact that the band-type brake cannot be opened, and the phenomenon of slipping hooks is prevented.
In some embodiments, in response to the master controller switching from the non-zero position to the zero position, the master non-zero position in the second brake line = 05-S17:7 and = 05-S17:8, the normally open contact is opened, the contactor KM03 in the second brake circuit is powered off, the main lifting brake=05-1 YTS power supply and the main lifting brake=05-2 YTS power supply are cut off, and the main lifting brake is closed to perform mechanical braking preferentially; at the same time, the relay KA01 or the relay KA02 is disconnected when power is lost, the main lifting line and the main lowering line are disconnected, the frequency converter=05-U1 loses a given direction signal, and the lifting energy consumption braking is controlled to stop.
Specifically, when the master controller returns from the non-zero position to the zero position, since the master non-zero position in the second brake line=05-S17: 7 and = 05-S17:8, opening the normally open auxiliary contact to cause the contactor KM03 in the second brake circuit to be powered off, directly cutting off the power supply of the main lifting brake = 05-1YTS and = 05-2YTS, and performing mechanical braking preferentially when the brake is closed; at the same time, KA01 or KA02 is in power-off state (the main lifting line and the main lowering line are disconnected), the indicator light is on, the frequency converter=05-U1 loses a given direction signal, and the lifting motor is controlled to brake and stop in a power-consumption mode.
The frequency converter and the brake are braked simultaneously, so that the motor stops faster, the braking distance is shorter, and the braking moment is soft because the frequency converter braking belongs to energy consumption braking, the damage of mechanical elements is greatly reduced, and the whole service life is prolonged.
When the motor is not overspeed in normal operation, the overspeed switch=05-S41 normally closed auxiliary contacts are always closed, and the overspeed relay KA06 is in a suction state. When master = 05-S17 is in the non-zero position, the hoisting mechanism is operated, master zero position = 05-S17:1 and = 05-S17:2 normally closed auxiliary contacts are opened, coils of the zero relay KA05 are deenergized, the normally closed points of the KA05 are closed, and meanwhile, the non-zero position = 05-S17:7 and = 05-S17:8 normally open points are closed, the frequency converter=05-U1 receives the operation signal and the speed given signal, the normally open points of the XR03 are controlled to be closed, at the moment, the coil of the brake 2 contactor KM03 is electrified to be attracted, and the coil KM02 in the first brake circuit is controlled by the digital output point XR01 of the frequency converter=05-U1 and is attracted simultaneously with the coil KM 03.
The control method of the above embodiment is used for implementing the corresponding lifting double-brake control circuit in any of the foregoing embodiments, and has the beneficial effects of the corresponding circuit embodiments, which are not described herein.
In this embodiment, the braking distance is obviously shortened in the lifting double-braking control method for normal operation, the full load condition can be shortened to 1/3 of the single braking distance according to different lifting loads, the light load condition can be shortened to 1/10, and the control precision is not affected. When the lifting motor stalls, the main command returns to zero to forcedly mechanically brake, so that the safety performance of the lifting mechanism is greatly improved. When a single brake contactor is stuck, the brake is always in an open state, so that a suspended object slides to the ground, and after the brake contactor control method is used, two contactors are stuck at the same instant, so that the phenomenon can be caused, when the single contactor is stuck, a lifting mechanism is not operated, and the contactor is checked and replaced in time, so that the accident can be avoided.
Based on the same inventive concept, the embodiment of the application also provides a crane corresponding to the circuit of any embodiment.
The crane in the foregoing embodiment is used to implement the corresponding lifting double-brake control circuit in any of the foregoing embodiments, and has the beneficial effects of the corresponding circuit embodiment, which is not described herein again.
As shown in fig. 4, the light curve is a speed given curve, the dark curve is a curve of the actual rotation speed of the motor measured by the conventional single brake encoder, the X-axis is a time axis, and the Y-axis is a speed axis. In FIG. 4, the hoisting mechanism starts braking at a decreasing speed of-617.62 rpm, and when the speed reaches-1.54 rpm, the time required is 5.700 seconds.
As shown in fig. 5, the light curve is a speed given curve, the dark curve is a curve of the actual rotation speed of the motor measured by the double brake encoder in the present specification, the X-axis is a time axis, and the Y-axis is a speed axis. In FIG. 5, the hoisting mechanism starts braking at a decreasing speed of-615.95 rpm, and when the speed reaches-1.67 rpm, the time required is 3.786 seconds.
Compared with the prior art, the braking time of double braking is 66.42 percent of that of the traditional single braking under the same load and rotation speed, the braking distance is obviously shortened, the speed curve is smooth, and the speed is smooth and stable when the motor is actually braked.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and/or the like which are within the spirit and principles of the embodiments are intended to be included within the scope of the present application.
Claims (7)
1. The utility model provides a play to rise double brake control circuit, includes converter, stopper, play to rise motor and the main control circuit that is connected, the main control circuit includes that parallel connection plays to rise contactor circuit, main rising circuit, main circuit and the first braking circuit of falling between first common line and second common line, its characterized in that:
a master controller is arranged on the master control loop and is respectively connected with a zero position line, a master lifting line, a master lowering line and a first braking line;
the main control loop further comprises a second braking circuit and a double braking delay detection circuit which are connected with the first braking circuit in parallel, the first braking circuit and the second braking circuit are connected with the frequency converter, and the main command controller acts to control the frequency converter and the brake to perform double braking so as to brake the lifting motor;
the double-brake delay detection circuit detects the first brake circuit and the second brake circuit, the main lifting circuit and the main lowering circuit are controlled to be disconnected to cut off given signals in response to the fact that the detected states of the first brake circuit and the second brake circuit are inconsistent, and the frequency converter controls the lifting motor to brake.
2. The lifting double brake control circuit according to claim 1, wherein:
the master controller is provided with a plurality of normally open auxiliary contacts;
the zero line comprises a coil KA05, and one end of the coil KA05 passes through = 05-S17 of the master controller: 1. =05-S17: a 2 contact connected to the first common line and the other end connected to the second common line;
the main lifting circuit comprises a normally closed auxiliary contact of a lifting limiter=05-F01, a normally closed auxiliary contact of a limit switch=05-S50, a normally closed auxiliary contact of a relay-KA 02 and a coil KA01, wherein one end of the coil KA01 is connected with a second common line, and the other end of the coil KA01 is connected with the=05-S50 of the limit switch=05-S50 through the normally closed auxiliary contact of the relay-KA 02: 2 contacts, limit switch = 05-S50: a contact 1 is connected with a normally closed auxiliary contact of a lifting weight limiter=05-F01, and the normally closed auxiliary contact of the lifting weight limiter=05-F01 is connected with a normally closed auxiliary contact of the master controller=05-S17: 4 contacts, master controller = 05-S17: the 3 contact is connected with the first common line through a power-off time-delay normally-open auxiliary contact of the time-delay relay-KT 02;
a normally open auxiliary contact of a contactor-KM 00 is arranged on a first public line between the zero line and the main lifting line;
the main circuit that falls includes relay-KA 01 'S normal close auxiliary contact and coil KA02, the second common line is connected to the one end of coil KA02, the other end of coil KA02 passes through relay-KA 01' S normal close auxiliary contact and connects limit switch = 05-S50:4 contacts, limit switch = 05-S50:3 contacts connect the master controller = 05-S17:6 contacts, the master controller = 05-S17: and the 5 contact is connected with the power-off time-delay normally-open auxiliary contact of the time-delay relay-KT 02.
3. The lifting double brake control circuit according to claim 2, wherein:
the first brake circuit includes a coil KM02, one end of the coil KM02 is connected to the second common line, and the other end is connected to XR01 of the inverter=05-U1: 3 contacts, XR01 of the frequency converter=05-U1: 2 contacts connect the first common line;
the second brake circuit comprises a coil KM03 connected between the first common line and the second common line, a normally-open auxiliary contact of a relay KA06, a normally-closed auxiliary contact of a relay KA05, a normally-open auxiliary contact of a frequency converter and a normally-open auxiliary contact of a master controller;
one end of the coil KM03 is connected to a second common line, and the other end thereof is connected to a normally open auxiliary contact of the relay KA06, the normally open auxiliary contact is connected to a normally closed auxiliary contact of the relay KA05, and the normally closed auxiliary contact of the relay KA05 is connected to = 05-S17 of the main controller: 8 contacts, the main controller = 05-S17: the 7 contacts are connected to the first common line.
4. A lifting double brake control circuit according to claim 3, wherein:
the double-brake delay detection circuit comprises a delay coil KT02, wherein the delay coil KT02 is connected with a first common line through a normally open auxiliary contact of a contactor KM03 and a normally open auxiliary contact of the contactor KM02 which are connected in series;
the delay coil KT02 is also connected with a first common line through a normally closed auxiliary contact of a contactor KM03 and a normally closed auxiliary contact of the contactor KM02 which are connected in series.
5. A lifting double brake control method according to any one of claims 1 to 4, characterized by comprising:
the double-brake delay detection circuit detects states of the coil KM02 and the coil KM03 in real time, and responds to the fact that the attraction states of the contactor KM02 and the contactor KM03 are inconsistent and exceed a preset time, the power-off delay normally open auxiliary contact of the delay relay-KT 02 is disconnected, a given signal is cut off, the frequency converter controls the lifting motor to brake, and meanwhile the band-type brake is closed to mechanically brake.
6. The lifting double-brake control method according to claim 5, wherein:
in response to the master controller switching from the non-zero position to the zero position, master non-zero position = 05-S17 in the second brake line: 7 and = 05-S17:8, the normally open contact is opened, the contactor KM03 in the second brake circuit is powered off, the main lifting brake=05-1 YTS power supply and the main lifting brake=05-2 YTS power supply are cut off, and the main lifting brake is closed to perform mechanical braking preferentially; at the same time, the relay KA01 or the relay KA02 is disconnected when power is lost, the main lifting line and the main lowering line are disconnected, the frequency converter=05-U1 loses a given direction signal, and the lifting energy consumption braking is controlled to stop.
7. A crane, characterized in that: comprising a lifting double brake control circuit according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311669970.6A CN117623125A (en) | 2023-12-06 | 2023-12-06 | Lifting double-brake control circuit, control method and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311669970.6A CN117623125A (en) | 2023-12-06 | 2023-12-06 | Lifting double-brake control circuit, control method and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117623125A true CN117623125A (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311669970.6A Pending CN117623125A (en) | 2023-12-06 | 2023-12-06 | Lifting double-brake control circuit, control method and crane |
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| Country | Link |
|---|---|
| CN (1) | CN117623125A (en) |
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2023
- 2023-12-06 CN CN202311669970.6A patent/CN117623125A/en active Pending
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