CN111039208B - Frequency conversion hoisting mechanism and tower crane - Google Patents
Frequency conversion hoisting mechanism and tower crane Download PDFInfo
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- CN111039208B CN111039208B CN201911256895.4A CN201911256895A CN111039208B CN 111039208 B CN111039208 B CN 111039208B CN 201911256895 A CN201911256895 A CN 201911256895A CN 111039208 B CN111039208 B CN 111039208B
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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
- B66D1/02—Driving gear
- B66D1/12—Driving gear incorporating electric motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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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
- B66D1/02—Driving gear
- B66D1/14—Power transmissions between power sources and drums or barrels
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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
- B66D1/02—Driving gear
- B66D1/14—Power transmissions between power sources and drums or barrels
- B66D1/24—Power transmissions between power sources and drums or barrels for varying speed or reversing direction of rotation of drums or barrels, i.e. variable ratio or reversing gearing
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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
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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
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention discloses a variable-frequency hoisting mechanism and a tower crane. Wherein, this frequency conversion hoisting mechanism includes: two inverter motor, two inverter motor include: the system comprises a first motor, a first frequency converter for controlling the first motor, a second motor and a second frequency converter for controlling the second motor; a dual reducer, the dual reducer comprising: the speed change mechanism is connected with the output end of the first motor and has a first adjustable speed reduction ratio, and the speed change mechanism is connected with the output end of the second motor and has a second adjustable speed reduction ratio; the winding drum is connected with the double speed reducers and is driven by the double speed reducers together to drive the load to lift or fall; a hoist detection unit for detecting a measured value of the load; a shift controller for controlling the first adjustable reduction ratio gear change mechanism and the second adjustable reduction ratio gear change mechanism to adjust the reduction ratio based on a measured value of the load.
Description
Technical Field
The invention relates to the field of lifting control, in particular to a variable-frequency lifting mechanism and a tower crane.
Background
The hoisting mechanism, especially the hoisting mechanism of the tower crane, often has the characteristics of large control power and wide speed regulation range, so that the mechanical impact generated in the speed regulation process of the hoisting mechanism of the tower crane is large, the fatigue failure of the structural member of the tower crane is easily caused, the damage to the load is possibly caused, and the inestimable loss is caused.
In the related art, how to effectively relieve the mechanical impact generated by the hoisting mechanism in the wide-range speed regulation process is a technical problem to be solved urgently.
Disclosure of Invention
In view of this, the embodiment of the invention provides a variable-frequency hoisting mechanism and a tower crane, and aims to relieve mechanical impact generated by the hoisting mechanism in a wide-range speed regulation process.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a variable-frequency hoisting mechanism, which comprises:
two inverter motor, two inverter motor include: the system comprises a first motor, a first frequency converter for controlling the first motor, a second motor and a second frequency converter for controlling the second motor;
a dual reducer, the dual reducer comprising: the speed change mechanism is connected with the output end of the first motor and has a first adjustable speed reduction ratio, and the speed change mechanism is connected with the output end of the second motor and has a second adjustable speed reduction ratio;
the winding drum is connected with the double speed reducers and is driven by the double speed reducers together to drive the load to lift or fall;
a hoist detection unit for detecting a measured value of the load;
a shift controller for controlling the first adjustable reduction ratio gear change mechanism and the second adjustable reduction ratio gear change mechanism to adjust the reduction ratio based on a measured value of the load.
In the above scheme, the first frequency converter controls the first motor based on a speed control mode; the second inverter controls the second motor based on a torque control mode; and the second frequency converter controls the second motor based on a torque control mode according to the torque control signal output by the first frequency converter.
In the foregoing solution, the shift controller is specifically configured to:
when the power is initially powered on, the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio are both corresponding large speed reduction ratios;
monitoring the measured value of the load detected by the hoisting weight detection unit during hoisting;
if the measured value of the load is light load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is still light load, controlling the reduction ratio of the speed change mechanism with the first adjustable reduction ratio to be switched to a corresponding small reduction ratio.
In the foregoing solution, the shift controller is further configured to:
if the measured value of the load is a medium load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is a heavy load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding large reduction ratio.
In the foregoing solution, the shift controller is further configured to:
and if the measured value of the load is heavy load, keeping the reduction ratios of the speed change mechanism with the first adjustable reduction ratio and the speed change mechanism with the second adjustable reduction ratio to be corresponding large reduction ratios.
In the above scheme, when the reduction ratio of the speed change mechanism controlling the first adjustable reduction ratio is switched to a corresponding small reduction ratio, the second frequency converter controls the second motor according to a torque control instruction output by the gear shift controller and based on a torque control mode; and after the reduction ratio of the speed change mechanism with the first adjustable reduction ratio is switched to a corresponding small reduction ratio, the second frequency converter controls the second motor according to a torque control signal output by the first frequency converter and based on a torque control mode.
In the above solution, the hoisting detection unit determines the measured value of the load according to the torque control signal output by the first frequency converter or the hoisting detection unit is a sensor separately provided for detecting the measured value of the load.
In the above scheme, the double speed reducer further comprises a first speed reducer and a second speed reducer with two fixed reduction ratios, the speed change mechanism with the first adjustable reduction ratio is connected with the winding drum through the first speed reducer, and the speed change mechanism with the second adjustable reduction ratio is connected with the winding drum through the second speed reducer.
In the above scheme, the double speed reducer further comprises a shared speed reducer with two input ends and an output end, the speed change mechanism with the first adjustable speed reduction ratio is connected with the speed change mechanism with the second adjustable speed reduction ratio respectively, and the output end of the shared speed reducer is connected with the winding drum.
The embodiment of the invention also provides a tower crane which comprises the variable-frequency hoisting mechanism in any embodiment.
According to the technical scheme provided by the embodiment of the invention, the winding drum is driven by the double variable frequency motor and the double speed reducer, the requirement of wide-range speed regulation of the lifting mechanism can be realized, the measured value of the load is detected by the hoisting weight detection unit, the gear shifting controller controls the speed reduction ratio of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio based on the measured value of the load, the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio can be adjusted according to the state of the load in the control process of wide-range speed regulation of the lifting mechanism, the mechanical impact can be effectively relieved in the speed regulation process by reasonably controlling the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed.
Drawings
Fig. 1 is a schematic structural diagram of a variable-frequency hoisting mechanism according to a first embodiment of the invention;
fig. 2 is a schematic structural diagram of a variable-frequency hoisting mechanism according to a second embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
In the description of the invention reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
In the description of the invention, reference may be made to the terms "first," second, "etc. merely for distinguishing between similar elements and not for indicating a particular ordering of such elements, it being understood that" first, "second," etc. may be interchanged with one another in a particular order or sequence, where permissible, to enable embodiments of the invention described herein to be practiced otherwise than as illustrated or described herein. Unless otherwise indicated, "plurality" means at least two.
The embodiment of the invention provides a variable-frequency hoisting mechanism, which comprises: double-frequency-conversion motor, double speed reducer, reel, hoisting weight detecting unit and gear shifting controller. Wherein, two inverter motor includes: the motor comprises a first motor, a first frequency converter for controlling the first motor, a second motor and a second frequency converter for controlling the second motor. The double reduction gear includes: the speed change mechanism is connected with a first adjustable speed reduction ratio at the output end of the first motor, and the speed change mechanism is connected with a second adjustable speed reduction ratio at the output end of the second motor. The winding drum is connected with the double speed reducers and is driven by the double speed reducers together to drive the load to lift or fall. The hoisting detection unit is used for detecting the measured value of the load. The shift controller is configured to control the first adjustable reduction ratio variator and the second adjustable reduction ratio variator to adjust the reduction ratio based on a measured value of the load.
In practical application, the first frequency converter controls the first motor based on a speed control mode; the second inverter controls the second motor based on a torque control mode. Here, the speed control mode means that the inverter aims at controlling the rotational speed of the motor, and the torque of the motor needs to be adjusted to maintain the speed. The torque control mode means that the frequency converter aims at controlling the output torque of the motor, and the speed is related to the external load and is not related to the torque. In the embodiment of the invention, the first frequency converter works in a speed control mode, the first motor is used as a main motor, and a transmission loop corresponding to the first motor is used as a main loop and is used for controlling the rotating speed of the winding drum. The second frequency converter works in a torque control mode, the second motor serves as an auxiliary motor, and a transmission loop corresponding to the second motor serves as an auxiliary loop and is used for being matched with the main loop to improve the wide speed ratio range of the winding drum. Specifically, the first frequency converter can control the first motor to work to a specified speed according to a speed signal of a tower crane cab, and simultaneously outputs a torque control signal to the second frequency converter, the second frequency converter controls the second motor to output corresponding torque according to the magnitude of the torque control signal and runs along with the first motor, the second motor only outputs corresponding torque along with the first motor, and the speed is consistent along with the speed of the system, namely the second frequency converter does not control the speed of the second motor, so that the speed of a winding drum of the lifting mechanism is controlled by the main motor (namely the first motor), and the output torque of the winding drum is driven by the double motors together after passing through different speed reduction transmission paths. The speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio adopt speed change mechanisms with adjustable speed reduction ratios, and the speed regulation range of the whole variable-frequency hoisting mechanism can be enlarged.
In addition, the hoisting weight detection unit detects the measured value of the load, the gear shifting controller controls the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio to adjust the speed reduction ratio based on the measured value of the load, so that the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio can be adjusted according to the state of the load in the control process of wide-range speed regulation of the hoisting mechanism, mechanical impact can be effectively relieved in the speed regulation process through reasonably controlling the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio, and the stability and safety of the speed regulation process.
In an embodiment, the shift controller is specifically configured to:
when the power is initially powered on, the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio are both corresponding large speed reduction ratios;
monitoring the measured value of the load detected by the hoisting weight detection unit during hoisting;
if the measured value of the load is light load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is still light load, controlling the reduction ratio of the speed change mechanism with the first adjustable reduction ratio to be switched to a corresponding small reduction ratio.
Here, the speed change mechanism of the first adjustable reduction ratio and the speed change mechanism of the second adjustable reduction ratio each have at least two reduction ratios, wherein a large reduction ratio can support the speed change requirement of a heavy low speed, and a small reduction ratio can support the speed change requirement of a light high speed. In one embodiment, the gear shifting mechanism of the first adjustable reduction ratio and the gear shifting mechanism of the second adjustable reduction ratio may only include a low gear corresponding to a large reduction ratio and a high gear corresponding to a small reduction ratio. Of course, those skilled in the art can add an intermediate speed-adjusting gear between the low gear and the high gear according to requirements. It should be noted that the respective reduction ratios of the first adjustable reduction ratio gear shifting mechanism and the second adjustable reduction ratio gear shifting mechanism may be set to be the same or different.
Here, when the power is initially supplied, the reduction ratio of the speed change mechanism with the first adjustable reduction ratio and the reduction ratio of the speed change mechanism with the second adjustable reduction ratio are initialized to be a large reduction ratio, and the heavy-load lifting requirement when the lifting mechanism is started can be met. The gear shift controller may generate a corresponding gear shift instruction to control the gear shift mechanism of the first adjustable reduction ratio and the gear shift mechanism of the second adjustable reduction ratio to shift gears according to a measured value of the load monitored at the time of starting. The measured value of the load can be parameters such as weight of the load, torque corresponding to the load and the like.
In practical application, during hoisting, the gear shifting controller receives a measured value of the load detected by the hoisting weight detection unit so as to continuously monitor the load. And if the measured values of the loads in the set duration are all smaller than or equal to the first load, determining that the measured value of the load is light load, and logically controlling the gear shifting controller in two steps. Specifically, the gear shifting controller firstly controls the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is still light load, controlling the reduction ratio of the speed change mechanism with the first adjustable reduction ratio to be switched to a corresponding small reduction ratio. Therefore, the reduction ratios of the speed change mechanism with the first adjustable reduction ratio and the speed change mechanism with the second adjustable reduction ratio are prevented from being directly switched to the corresponding small reduction ratios, misjudgment caused by unreal load of the measured value of the monitored load when the load is not completely lifted can be avoided, and the gear shift controller controls the reduction ratios of the speed change mechanism with the first adjustable reduction ratio to be switched to the corresponding small reduction ratios when the measured value of the load is still light load through subsequent monitoring. Like this, the speed reduction ratio of the speed change mechanism of first adjustable speed reduction ratio, the speed change mechanism of the adjustable speed reduction ratio of second all switches to corresponding little speed reduction ratio, can ensure the high-speed operation under the light load state, has improved hoisting mechanism's operating efficiency, and has ensured the security in the speed governing process, has effectively avoided mechanical shock. Wherein the first load can be determined according to the load supported by the variable frequency hoisting mechanism when the variable frequency hoisting mechanism runs at the highest speed. For example, when the first load is the load supported by the variable frequency hoisting mechanism in the widest speed regulating range allowed by the main loop and the auxiliary loop acting together.
In an embodiment, the shift controller is further configured to: if the measured value of the load is a medium load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is a heavy load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding large reduction ratio.
Here, when lifting, the shift controller receives the measured value of the load detected by the hoist detection unit to continuously monitor the load. And if the measured value of the load in the set time length exceeds the first load and is less than the second load, determining that the measured value of the load is the medium load. The gear shifting controller firstly controls the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is a heavy load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding large reduction ratio. Here, if the measured value of the load is greater than the second load for the duration of the monitoring setting, the measured value of the load is determined to be a heavy load. The set time duration can be reasonably set according to the reliability of monitoring, and the second load can be determined according to the proportion value of the rated load of the variable-frequency hoisting mechanism when the main loop and the auxiliary loop act together. The second load > the first load. In one example of application, the second load takes on 80% of the rated load. It should be noted that, a person skilled in the art can reasonably set the second load according to the requirement of speed regulation.
In an embodiment, the shift controller is further configured to: and if the measured value of the load is determined to be heavy load, the reduction ratios of the speed change mechanism with the first adjustable reduction ratio and the speed change mechanism with the second adjustable reduction ratio are both corresponding large reduction ratios.
Here, when lifting, the shift controller receives the measured value of the load detected by the hoist detection unit to continuously monitor the load. And if the measured value of the load exceeds the second load within the set time length, determining that the measured value of the load is the heavy load. The gear shift controller maintains the reduction ratios of the first adjustable reduction ratio gear shifting mechanism and the second adjustable reduction ratio gear shifting mechanism at respective large reduction ratios.
According to the variable-frequency hoisting mechanism provided by the embodiment of the invention, the reduction ratios of the speed reducers in the main loop and the auxiliary loop are reasonably controlled according to the state of the load, so that the first frequency converter and the second frequency converter can work in a reasonable frequency range, and the mechanical impact in the wide-range speed regulation process is effectively reduced.
In consideration of the fact that a transmission link is prevented from being broken with a power source in the gear shifting process, when the gear shifting operation is carried out on the speed change mechanism with the first adjustable speed reduction ratio of the main loop, the transmission link of the first motor and the winding drum of the main loop is cut off in a transient state, the torque output cannot truly reflect an actual load value, the winding drum is independently driven by the output torque of the auxiliary loop, and when the main loop is not true, the dangerous working condition of the whole hoisting mechanism can be caused. Based on this, in one embodiment, when the reduction ratio of the speed change mechanism controlling the first adjustable reduction ratio is switched to a corresponding small reduction ratio, the second frequency converter controls the second motor according to the torque control signal output by the gear shift controller and based on a torque control mode; and after the reduction ratio of the speed change mechanism with the first adjustable reduction ratio is switched to a corresponding small reduction ratio, the second frequency converter controls the second motor according to a torque control signal output by the first frequency converter and based on a torque control mode. Therefore, the speed of the main circuit is kept consistent with the driving torque of the winding drum before and after gear shifting, and the gear shifting is stable and safe.
In an embodiment, the hoisting detection unit determines the measured value of the load according to the torque control signal output by the first frequency converter or the hoisting detection unit is a separately provided sensor for detecting the measured value of the load. For example, the sensor may be a gravity sensor or a torque sensor.
In an embodiment, the dual speed reducer further includes a first speed reducer and a second speed reducer with two fixed speed reduction ratios, the speed change mechanism with the first adjustable speed reduction ratio is connected to the drum through the first speed reducer, and the speed change mechanism with the second adjustable speed reduction ratio is connected to the drum through the second speed reducer.
In an embodiment, the dual speed reducer further includes a common speed reducer having two input ends and an output end, the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio are respectively connected to one of the two input ends of the common speed reducer, and the output end of the common speed reducer is connected to the winding drum. Therefore, the structure of the whole variable-frequency hoisting mechanism is more compact.
First embodiment
As shown in fig. 1, in the first embodiment, the variable-frequency hoisting mechanism includes: the main motor 1, the main frequency converter 2, the gear shift controller 3, the hoist weight detecting unit 4, the auxiliary frequency converter 5, the auxiliary motor 6, the auxiliary variable reduction ratio unit 7, the auxiliary speed reducer 8, the winding drum 9, the main speed reducer 10 and the main variable reduction ratio unit 11. The main motor 1 corresponds to the first motor, the main frequency converter 2 corresponds to the first frequency converter, the main variable reduction ratio unit 11 corresponds to the speed change mechanism with the first adjustable reduction ratio, the sub-motor 6 corresponds to the second motor, the sub-frequency converter 5 corresponds to the second frequency converter, the sub-variable reduction ratio unit 7 corresponds to the speed change mechanism with the second adjustable reduction ratio, the main speed reducer 10 corresponds to the first speed reducer, and the sub-speed reducer 8 corresponds to the second speed reducer.
The variable-frequency hoisting mechanism is powered on, and the gear shifting controller initializes and sets the reduction ratio of the speed change mechanism with the first adjustable reduction ratio and the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to a large reduction ratio. After the frequency conversion hoisting mechanism is started, the specific working process of the frequency conversion hoisting mechanism is as follows:
the first situation is as follows: the hoisting weight detecting unit 4 detects the hoisting weight of the load on the winding drum 9, if the hoisting weight of the load is determined to be a heavy load, the gear shifting controller 3 controls the main variable reduction ratio unit 11 and the auxiliary variable reduction ratio unit 7 to be in a large reduction ratio, the main frequency converter 2 controls the main motor 1 to run to a set speed based on a speed control mode according to an input speed instruction, and the winding drum 9 is driven to rotate through the main variable reduction ratio unit 11 and the main speed reducer 10 in sequence. The main frequency converter 2 also generates a torque control signal to the auxiliary frequency converter 5 according to the detected load hoisting weight, the auxiliary frequency converter 5 controls the auxiliary motor 6 to output a set torque based on a torque control mode, and the auxiliary frequency converter drives the winding drum 9 to rotate through the auxiliary variable speed reduction ratio unit 7 and the auxiliary speed reducer 8 in sequence.
Case two: the hoisting weight detecting unit 4 detects the hoisting weight of the load on the drum 9, if the hoisting weight of the load is determined to be light load, the gear shifting controller 3 controls the main variable reduction ratio unit 11 to be in a large reduction ratio and the auxiliary variable reduction ratio unit 7 to be in a small reduction ratio, and the main frequency converter 2 controls the main motor 1 to run to a set speed based on a speed control mode according to an input speed instruction, and drives the drum 9 to rotate through the main variable reduction ratio unit 11 and the main speed reducer 10 in sequence. The main frequency converter 2 also generates a torque control signal to the auxiliary frequency converter 5 according to the detected load hanging weight, the auxiliary frequency converter 5 controls the auxiliary motor 6 to output a set torque based on a torque control mode, and the set torque drives the winding drum 9 to rotate through the auxiliary variable speed reduction ratio unit 7 and the auxiliary speed reducer 8 in sequence. Then, if the hanging weight detecting unit 4 detects the hanging weight of the load on the winding drum 9 and determines that the hanging weight of the load is still light, the gear shifting controller 3 generates a torque control signal to the auxiliary frequency converter 5 according to the hanging weight load detected by the hanging weight detecting unit 4, the auxiliary frequency converter 5 controls the auxiliary motor 6 to output a set torque based on the torque control mode, the gear shifting controller 3 further controls the main variable reduction ratio unit 11 to switch to a small reduction ratio, after the switching, the auxiliary frequency converter 5 continues to receive the torque control signal generated by the main frequency converter 2 and also according to the detected hanging weight of the load, and controls the auxiliary motor 6 to output a corresponding torque based on the switching control mode; if it is determined that the load sling is a medium load, the shift controller 3 controls the main variable reduction ratio unit 11 to be at a large reduction ratio and the sub variable reduction ratio unit 7 to be at a small reduction ratio; if it is determined that the load is heavy, the shift controller 3 controls the main variable reduction ratio unit 11 to be at a large reduction ratio and the sub variable reduction ratio unit 7 to be at a large reduction ratio.
Case three: the hoist weight detecting unit 4 detects the load hoist weight on the drum 9, and if the load hoist weight is determined to be a medium load, the shift controller 3 controls the main variable reduction ratio unit 11 to be at a large reduction ratio and the sub variable reduction ratio unit 7 to be at a small reduction ratio, and the main inverter 2 controls the main motor 1 to run to a set speed based on a speed control mode according to an input speed instruction, and drives the drum 9 to rotate through the main variable reduction ratio unit 11 and the main reducer 10 in sequence. The main frequency converter 2 also generates a torque control signal to the auxiliary frequency converter 5 according to the detected load hanging weight, the auxiliary frequency converter 5 controls the auxiliary motor 6 to output a set torque based on a torque control mode, and the set torque drives the winding drum 9 to rotate through the auxiliary variable speed reduction ratio unit 7 and the auxiliary speed reducer 8 in sequence. The load detection unit 4 continues to detect the load, and if it is determined that the load is heavy, the shift controller 3 controls the reduction ratio of the sub variable reduction ratio unit 7 to switch to a corresponding large reduction ratio.
Second embodiment
As shown in fig. 2, the second embodiment differs from the first embodiment in that the double reduction gear unit uses a common reduction gear unit 12 instead of the main reduction gear unit 10 and the sub reduction gear unit 8 in the first embodiment, and the common reduction gear unit 12 has two input terminals and a common output terminal, and the common output terminal is connected to the drum 9. For a specific working process, reference may be made to the first embodiment, which is not described herein again.
The embodiment of the invention also provides a tower crane (also called a tower crane), which comprises a tower body, wherein the tower body is provided with the variable-frequency hoisting mechanism of the embodiment. This tower machine has above-mentioned frequency conversion hoisting mechanism's advantage, no longer gives unnecessary details here.
It should be noted that: the technical schemes described in the embodiments of the present invention can be combined arbitrarily without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The utility model provides a frequency conversion hoisting mechanism which characterized in that includes:
two inverter motor, two inverter motor include: the system comprises a first motor, a first frequency converter for controlling the first motor, a second motor and a second frequency converter for controlling the second motor;
a dual reducer, the dual reducer comprising: the speed change mechanism is connected with the output end of the first motor and has a first adjustable speed reduction ratio, and the speed change mechanism is connected with the output end of the second motor and has a second adjustable speed reduction ratio;
the winding drum is connected with the double speed reducers and is driven by the double speed reducers together to drive the load to lift or fall;
a hoist detection unit for detecting a measured value of the load;
a shift controller for controlling the first adjustable reduction ratio gear change mechanism and the second adjustable reduction ratio gear change mechanism to adjust the reduction ratio based on a measured value of the load.
2. The variable frequency hoisting mechanism of claim 1 wherein the shift controller is specifically configured to:
when the power is initially powered on, the speed reduction ratios of the speed change mechanism with the first adjustable speed reduction ratio and the speed change mechanism with the second adjustable speed reduction ratio are both corresponding large speed reduction ratios;
monitoring the measured value of the load detected by the hoist detection unit;
if the measured value of the load is light load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is still light load, controlling the reduction ratio of the speed change mechanism with the first adjustable reduction ratio to be switched to a corresponding small reduction ratio.
3. The variable frequency hoist mechanism of claim 2, wherein the shift controller is further configured to:
if the measured value of the load is a medium load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding small reduction ratio; and continuously monitoring the measured value of the load, and if the measured value of the load is a heavy load, controlling the reduction ratio of the speed change mechanism with the second adjustable reduction ratio to be switched to a corresponding large reduction ratio.
4. The variable frequency hoist mechanism of claim 2, wherein the shift controller is further configured to:
and if the measured value of the load is heavy load, keeping the reduction ratios of the speed change mechanism with the first adjustable reduction ratio and the speed change mechanism with the second adjustable reduction ratio to be corresponding large reduction ratios.
5. The variable-frequency hoisting mechanism according to claim 2, wherein when the speed reduction ratio of the speed change mechanism controlling the first adjustable speed reduction ratio is switched to a corresponding small speed reduction ratio, the second frequency converter controls the second motor according to a torque control command output by the gear shift controller and based on a torque control mode; and after the reduction ratio of the speed change mechanism with the first adjustable reduction ratio is switched to a corresponding small reduction ratio, the second frequency converter controls the second motor according to a torque control signal output by the first frequency converter and based on a torque control mode.
6. The variable frequency hoisting mechanism of claim 1,
the hoisting weight detection unit determines the measured value of the load according to the torque control signal output by the first frequency converter or is a sensor which is independently arranged and used for detecting the measured value of the load.
7. The variable frequency hoisting mechanism of claim 1,
the double speed reducer further comprises a first speed reducer and a second speed reducer with two fixed reduction ratios, the speed change mechanism with the first adjustable reduction ratio is connected with the winding drum through the first speed reducer, and the speed change mechanism with the second adjustable reduction ratio is connected with the winding drum through the second speed reducer.
8. The variable frequency hoisting mechanism of claim 1,
the double-speed reducer further comprises a shared speed reducer with double input ends and an output end, the speed change mechanism with the first adjustable speed reduction ratio is connected with the speed change mechanism with the second adjustable speed reduction ratio respectively, one of the double input ends of the shared speed reducer is connected with the output end of the shared speed reducer, and the winding drum is connected with the output end of the shared speed reducer.
9. A tower crane, characterized in that it comprises a variable frequency hoisting mechanism as claimed in any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113620176A (en) * | 2020-05-09 | 2021-11-09 | 安川电机（中国）有限公司 | Control method and device of hoisting equipment |
| CN115215242B (en) * | 2022-09-19 | 2023-04-18 | 杭州未名信科科技有限公司 | Winch gradient brake power system of intelligent tower crane and intelligent tower crane |
| CN115215237B (en) * | 2022-09-19 | 2023-03-07 | 浙江省北大信息技术高等研究院 | Tower crane intelligent trolley for changing amplitude and intelligent tower crane |
| CN115231460B (en) * | 2022-09-19 | 2023-01-17 | 杭州未名信科科技有限公司 | Winch stepless speed reduction power system of intelligent tower crane and intelligent tower crane |
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