CN215516463U - Hoist protection device, hoist mechanism and crane - Google Patents
Hoist protection device, hoist mechanism and crane Download PDFInfo
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- CN215516463U CN215516463U CN202121572924.0U CN202121572924U CN215516463U CN 215516463 U CN215516463 U CN 215516463U CN 202121572924 U CN202121572924 U CN 202121572924U CN 215516463 U CN215516463 U CN 215516463U
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Abstract
The utility model relates to a hoisting protection device, a hoisting mechanism and a crane. Wherein, hoist protection device includes: a housing; the first shaft comprises a first end and a second end along the axial direction, the first end of the first shaft is positioned outside the shell and is configured to be connected with the hoisting rotating shaft, the second end of the first shaft is positioned in the shell, and the first shaft is rotatably arranged relative to the shell; the first permanent magnet is arranged at the second end of the first shaft and is configured to cause the change of the magnetic field along with the rotation of the first shaft; and the detection device is arranged in the shell and comprises a first magnetic field sensor which is configured to detect the change of the magnetic field caused by the first permanent magnet so as to obtain the rotation number of the first shaft. The utility model adopts the matching of the permanent magnet and the magnetic field sensor, obtains the rotation angle of the winding drum by detecting the strength and the direction change of the magnetic field, and further protects the winding mechanism, wherein the detection mode is a non-contact detection mode, and the detection precision is high.
Description
Technical Field
The utility model relates to the field of engineering machinery, in particular to a winding protection device, a winding mechanism and a crane.
Background
The three-circle winding protector is a safety device for preventing the overwinding or the overwinding of a steel wire rope in a hoisting mechanism of a crane. In some correlation techniques, three rings of protection device of hoist adopt gear mechanical structure to realize contact switch feedback, when initial position adjustment, because the reduction gear is bigger, unable accurate positioning, and the adjustment process is comparatively loaded down with trivial details, and the precision receives artificial influence, and is inefficient, is difficult to satisfy engineering machine tool high efficiency debugging, is unfavorable for whole quick-witted intelligent promotion simultaneously.
Disclosure of Invention
Some embodiments of the utility model provide a hoisting protection device, a hoisting mechanism and a crane, which are used for relieving the problem of low detection precision of the hoisting protection device.
In one aspect of the present invention, there is provided a winding protection device, comprising:
a housing;
a first shaft including a first end and a second end in an axial direction, the first end of the first shaft being located outside the housing and configured to be connected to a hoisting rotating shaft, the second end of the first shaft being located inside the housing, the first shaft being rotatably disposed with respect to the housing;
a first permanent magnet disposed at a second end of the first shaft, the first permanent magnet configured to cause a magnetic field change with rotation of the first shaft; and
a detection device disposed within the housing, the detection device including a first magnetic field sensor configured to detect a change in a magnetic field caused by the first permanent magnet for obtaining a number of rotations of the first shaft.
In some embodiments, the detection device further includes a circuit board and a control chip, the control chip is disposed on the circuit board, the control chip is electrically connected to the first magnetic field sensor, and the control chip is configured to receive a signal sent by the first magnetic field sensor so as to convert the signal into a number of rotations of the first shaft.
In some embodiments, the first magnetic field sensor comprises a hall chip.
In some embodiments, the hoist guard further comprises:
the first gear is arranged on the first shaft;
a second shaft disposed parallel to the first shaft;
a second gear provided on the second shaft, the second gear being engaged with the first gear, a transmission ratio between the second gear and the first gear being configured such that a rotational speed of the second shaft is lower than a rotational speed of the first shaft; and
the second permanent magnet is arranged on the second shaft and is configured to cause the change of the magnetic field along with the rotation of the second shaft;
wherein the detection device further comprises a second magnetic field sensor configured to detect a magnetic field change caused by the second permanent magnet for obtaining the rotation direction of the first shaft.
In some embodiments, the second permanent magnet is aligned with the first permanent magnet in a radial direction of the second axis.
In some embodiments, the detection device further comprises a circuit board, and the first magnetic field sensor and the second magnetic field sensor are both disposed on the circuit board.
In some embodiments, the first magnetic field sensor and the second magnetic field sensor each comprise a hall chip.
In some embodiments, the transmission ratio between the second gear and the first gear is configured such that the first shaft rotates through a full number of turns, and the second shaft rotates through an angle of 180 degrees or less.
In one aspect of the utility model, the hoisting mechanism comprises a winding drum, a hoisting rotating shaft and the hoisting protection device, wherein the hoisting rotating shaft is in driving connection with the winding drum, the winding drum is configured to rotate along with the hoisting rotating shaft so as to wind or release a steel wire rope, and the hoisting rotating shaft is connected with a first shaft of the hoisting protection device.
In one aspect of the utility model, a crane is provided, comprising a hoisting mechanism as described above.
Based on the technical scheme, the utility model at least has the following beneficial effects:
in some embodiments, the hoisting protection device comprises a first permanent magnet and a first magnetic field sensor, the first permanent magnet is arranged on the first shaft, and the first permanent magnet causes the magnetic field to change along with the rotation of the first shaft. The first magnetic field sensor detects the magnetic field change caused by the first permanent magnet, the number of rotation turns of the first shaft can be obtained according to the magnetic field change period, and then the number of rotation turns of the winding drum is obtained, so that whether the steel wire rope on the winding drum is in an overwind or nearly unwinding state is judged, and safety accidents are prevented; the permanent magnet is matched with the magnetic field sensor, the number of rotating turns of the winding drum is obtained by detecting the periodic change of the magnetic field, and then the winding mechanism is protected.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
fig. 1 is a schematic illustration of a winch protection assembly installation location provided in accordance with some embodiments of the present invention;
fig. 2 is a schematic view of a winch protection device according to some embodiments of the present invention connected to a winch shaft;
fig. 3 is a schematic view of a hoisting protection device according to a first embodiment of the present invention;
fig. 4 is a schematic view of a hoisting protection device according to a second embodiment of the present invention;
fig. 5 is a schematic view illustrating an operation and a work flow of a hoisting protection device according to some embodiments of the present invention.
Reference numerals in the drawings are illustrated below:
1-a shell;
21-a first axis; 22-a second axis;
31-a first permanent magnet; 32-a second permanent magnet;
4-a detection device;
51-a first gear; 52-a second gear;
6-a nut;
10-a reel; 20-hoisting rotating shaft; 30-hoisting protection device; 40-a coupling sleeve.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the utility model, its application, or uses. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.
The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
As shown in fig. 1, in some embodiments, the hoisting mechanism includes a winding drum 10, a hoisting rotating shaft 20 and a hoisting protection device 30, the hoisting rotating shaft 20 is drivingly connected to the winding drum 10, the winding drum 10 is configured to wind or release a wire rope with rotation of the hoisting rotating shaft 20, and the hoisting rotating shaft 20 is connected to the hoisting protection device.
As shown in fig. 2 and 3, in some embodiments, the winding protection device 30 includes a housing 1, a first shaft 21, a first permanent magnet 31, and a detection device 4.
The first shaft 21 includes a first end and a second end in the axial direction, the first end of the first shaft 21 is located outside the housing 1 and configured to be connected with the hoisting rotation shaft 20, the second end of the first shaft 21 is located inside the housing 1, and the first shaft 21 is rotatably disposed with respect to the housing 1.
A first permanent magnet 31 is provided at a second end of the first shaft 21, the first permanent magnet 31 being configured to cause a magnetic field change with rotation of the first shaft 21.
The detection device 4 is provided inside the housing 1, the detection device 4 comprising a first magnetic field sensor configured to detect a change in the magnetic field caused by the first permanent magnet 31 for obtaining the number of turns of the first shaft 21.
The hoisting protection device 30 is arranged at one end of a hoisting rotating shaft 20 of the hoisting mechanism, a first shaft 21 in the hoisting protection device 30 is connected with the hoisting rotating shaft 20 in the hoisting mechanism, a first permanent magnet 31 is arranged at the end part of the first shaft 21, and the first permanent magnet 31 causes the change of a magnetic field along with the rotation of the first shaft 21. The first magnetic field sensor is arranged on the shell 1 and used for detecting the magnetic field change caused by the first permanent magnet 31, the number of rotation turns of the first shaft 21 can be obtained according to the period of the magnetic field change, because the first shaft 21 and the hoisting rotating shaft 20 rotate synchronously and the hoisting rotating shaft 20 drives the winding drum 10 to rotate, therefore, the number of rotation turns of the first shaft 21 is equal to the number of rotation turns of the winding drum 10, whether the steel wire rope on the winding drum 10 is in an overwind or nearly discharged state or not is judged according to the number of rotation turns of the winding drum 10, and when the steel wire rope on the winding drum 10 is overwind or nearly discharged, the detection device 4 sends out a signal to prevent safety accidents.
The permanent magnet is matched with the magnetic field sensor, the detection mode of obtaining the rotation angle and the number of turns by detecting the strength and the direction change of a magnetic field is a non-contact detection mode, and the detection precision is high.
In some embodiments, the detection device 4 is electrically connected to a controller of the winding mechanism, and when it is determined that the steel wire rope on the winding drum 10 is in an overwind or nearly completely unwound state according to the number of rotation turns of the first shaft 21, the detection device 4 sends a signal to the controller, so that the controller controls the winding shaft 20 of the winding mechanism to stop rotating, thereby preventing a safety accident.
In some embodiments, the detecting device 4 further includes a circuit board and a control chip, the control chip is disposed on the circuit board, the control chip is electrically connected to the first magnetic field sensor, and the control chip is configured to receive a signal sent by the first magnetic field sensor so as to convert the signal into a rotation number of the first shaft 21.
The circuit board is perpendicular to the axis of the first shaft 21, the first permanent magnet 21 rotates along with the first shaft 21 to cause a rotating magnetic field, the magnetic field intensity and the direction change periodically, the first magnetic field sensor detects the change of the surrounding magnetic field and outputs a voltage signal corresponding to the change of the surrounding magnetic field, the number of voltage pulses is captured by a control chip arranged on the circuit board and converted into the number of rotating circles, real-time data is recorded, and when the number of the circles reaches the limit value set by a built-in program, an alarm signal is sent to a system to stop the action of the hoisting mechanism.
The control chip is configured to record the number of rotation turns of the winding drum 10 of the hoisting mechanism in real time, so that when the steel wire rope is wound or released next time, whether the winding drum 10 is in a state of being overwound or nearly completely unwinding the steel wire rope can be judged.
In some embodiments, the first magnetic field sensor comprises a hall chip. The Hall chip is arranged on the circuit board.
The Hall voltage on the Hall chip on the circuit board can change along with the periodic change of the magnetic field, the control chip on the circuit board judges the number of rotation turns and the rotation speed of the winding drum 10 by capturing the change of the Hall voltage, records data, sends out an alarm signal when the number of rotation turns reaches a set upper limit value and a set lower limit value, and immediately cuts off the movement of the winding mechanism.
In some embodiments, a large-capacity battery is arranged on the circuit board to supply power to the circuit board when an external power supply is suddenly powered off, so that recorded data is prevented from being lost due to power failure, and risks are reduced. The circuit board adopts the design of often supplying power, and the real-time recording saves current position data, realizes complete machine real-time detection feedback, promotes intelligent control level.
In some embodiments, the detection device 4 further comprises a nut 6, the first permanent magnet 31 being fixed at the end of the first shaft 21 by means of the nut 6.
As shown in fig. 4, in some embodiments, the hoisting protection device further comprises a first gear 51, a second shaft 22, a second gear 52, and a second permanent magnet 32.
The first gear 51 is provided on the first shaft 21. The second shaft 22 is arranged in parallel with the first shaft 21. The second gear 52 is provided on the second shaft 22, the second gear 52 meshes with the first gear 51, and the gear ratio between the second gear 52 and the first gear 51 is configured such that the rotational speed of the second shaft 22 is lower than the rotational speed of the first shaft 21.
A second permanent magnet 32 is disposed on the second shaft 22, the second permanent magnet 32 being configured to cause a magnetic field change as the second shaft 22 rotates.
Wherein the detection device 4 further comprises a second magnetic field sensor configured to detect a magnetic field variation induced by the second permanent magnet 32 for obtaining the rotational direction of the first shaft 21.
In some embodiments, the first shaft 21 is connected to the second shaft 22 through a gear pair formed by a first gear 51 and a second gear 52 to realize speed reduction transmission, the first shaft 21 is synchronous with the rotation speed of the winding drum 10, the second shaft 22 is decelerated through the gear pair, and when the first shaft 21 rotates 360 degrees, the rotation angle of the second shaft 22 is greater than 0 degrees and less than or equal to 180 degrees. The second shaft 22 rotates at a slower speed, which facilitates accurate steering of the reel 10.
In some embodiments, the first shaft 21 is connected to the winding shaft 20, and the number of rotations and the rotation speed of the winding drum 10 by the detection device 4 can be directly measured. The rotation angle of the second shaft 22 is greater than 0 degree and less than or equal to 180 degrees, the second permanent magnet at the shaft end of the second shaft 22 comprises regions with opposite magnetic poles which are alternately arranged, and when the corresponding locking type Hall chips rotate clockwise and anticlockwise on the second shaft 22, the output voltages have different high and low level durations and can be used for identifying the winding rotation direction and performing redundant measurement on the number of rotation turns.
Through the cooperation of first permanent magnet 31 and first magnetic field sensor to and the cooperation of second permanent magnet 32 and second magnetic field sensor, realized rotating direction, rotational speed and the many parameters measurement of the number of turns of turning to make the measuring result more reliable and accurate.
In some embodiments, the second permanent magnet 32 is aligned with the first permanent magnet 31 in a radial direction of the second shaft 22.
In some embodiments, the detection device 4 further comprises a circuit board, and the first magnetic field sensor and the second magnetic field sensor are both disposed on the circuit board.
In some embodiments, the first magnetic field sensor and the second magnetic field sensor each comprise a hall chip. Optionally, the first magnetic field sensor and the second magnetic field sensor each comprise a locking-type hall chip.
In some embodiments, the transmission ratio between the second gear 52 and the first gear 51 is configured such that the second shaft 22 rotates less than or equal to 180 degrees during a full rotation of the first shaft 21.
As shown in fig. 3, the winding protector may detect the number of rotations and the rotation speed of the winding drum 10 only by providing the first shaft 21, the first permanent magnet 31 and the first magnetic field sensor.
For example: in the first embodiment, the winding protection device includes a first shaft 21, a first end of the first shaft 21 is connected with the winding rotating shaft 20 through a coupling sleeve 21, a first permanent magnet 31 is fixed at a second end of the first shaft 21, the detection device 4 includes a circuit board and a control chip, the first magnetic field sensor includes a hall chip, the hall chip is arranged on the circuit board, the circuit board is perpendicular to an axis of the first shaft 21, and the hall chip 31 detects a magnetic field change caused by the first permanent magnet 31 and directly detects the number of rotations and the rotating speed of the winding drum 10. The rotation direction of the winding drum 10 can be known according to the operation signals of lifting and descending the lifting hook of an operator, and the control chip records the number of turns of forward rotation or reverse rotation, so that an alarm signal is sent out when the winding drum 10 rotates to the preset number of turns.
As shown in fig. 4, the winding protection device may further include a first shaft 21, a first permanent magnet 31, a first magnetic field sensor, a second shaft 22, a second permanent magnet, and a second magnetic field sensor, so as to detect the number of turns, the rotation speed, and the direction of the winding drum 10.
For example: in the second embodiment, the first shaft 21 of the hoisting protection device is connected with the hoisting rotating shaft 20 through the coupling sleeve 21, the first gear 51 is arranged on the first shaft 21, and the second gear 52 is arranged on the second shaft 22. The winding rotating shaft 20 rotates to drive the first shaft 21 to rotate, so that the magnetic field intensity and the direction generated by the first permanent magnet on the first shaft 21 are periodically changed, meanwhile, the first shaft 21 drives the second shaft 22 to rotate through gear transmission, the second permanent magnet on the second shaft 22 generates periodic change of the magnetic field intensity and the direction, the speed of the periodic change is slow, and the winding drum can be used for detecting the rotating speed of the winding drum 10 and calibrating the number of rotating turns.
In some embodiments, the first gear 51 includes a multi-stage transmission gear, the second gear 52 includes a multi-stage transmission gear, and the first gear 51 and the second gear 52 perform multi-stage transmission, so that the rotation speed of the second shaft 22 can be regulated in multiple stages, and the detection accuracy is improved.
As shown in fig. 5, the operation and working flow of the hoisting protection device are as follows:
the number of rotatable upper and lower limit turns of the winding mechanism is set according to actual conditions, the number of the current rotation turns of the winding drum is corrected and recorded, and the amount of the residual rope on the winding drum is obtained.
After the winding mechanism starts to rotate, whether the winding drum rotates positively is judged: the judging method can judge the rotation direction of the hoisting mechanism by logically combining the algorithm preset by the hoisting protection device with the Hall voltage change caused by the second permanent magnet on the second shaft 22, and assumes that positive rotation is rope winding and negative rotation is rope unwinding.
If the winding mechanism is judged to rotate positively: whether the number of the current rotation turns of the winding drum reaches the upper limit of the set number of the rotation turns is further judged. If the upper limit of the set number of rotation turns is not reached, the winch mechanism is indicated to normally operate; if the upper limit of the set number of rotation turns is reached, the phenomenon of overwinding is indicated to be possible, at the moment, the hoisting protection device sends out an alarm signal, the power supply of the hoisting rotating shaft 20 is controlled to be cut off through the controller, and the winding drum 10 stops rotating so as to avoid safety accidents.
If the winding mechanism is judged not to rotate forwards but to rotate backwards: whether the number of the current rotation turns of the winding drum reaches the lower limit of the set number of the rotation turns is further judged, and if the number of the current rotation turns does not reach the lower limit of the set number of the rotation turns, the normal operation of the winding mechanism is indicated; if the lower limit of the set number of rotation turns is reached, the phenomenon of over-discharge is indicated to possibly occur, at the moment, the hoisting protection device sends out an alarm signal, the power supply of the hoisting rotating shaft 20 is controlled to be cut off through the controller, and the winding drum 10 stops rotating so as to avoid safety accidents.
Some embodiments also provide a winding mechanism, which includes a winding drum 10, a winding shaft 20 and the winding protection device, wherein the winding shaft 20 is drivingly connected to the winding drum 10, the winding drum 10 is configured to wind or release a steel wire rope along with the rotation of the winding shaft 20, and the winding shaft 20 is connected to a first shaft 21 of the winding protection device.
The winding protection device records the number of rotation turns of the winding drum 10 in the rotation process of the winding drum 10 and gives an alarm after the limit is reached.
In some embodiments, the hoisting mechanism further comprises a coupling sleeve, and the first shaft 21 is connected with the hoisting rotating shaft 20 through the coupling sleeve.
In some embodiments, the detection device 4 is electrically connected to a controller of the winding mechanism, and when it is determined that the steel wire rope on the winding drum 10 is in an overwind or nearly completely unwound state according to the number of rotation turns of the first shaft 21, the detection device 4 sends a signal to the controller, so that the controller controls the winding shaft 20 of the winding mechanism to stop rotating, thereby preventing a safety accident.
The winding protection device acquires the change of the magnetic field intensity and the direction caused by the permanent magnet through the magnetic field sensor to obtain the number of rotation turns of the winding drum 10, then calculates the residual rope amount of the winding drum 10 at the current moment through an algorithm, and judges whether the winding drum is in a safe state or not. When the amount of the residual rope exceeds the upper limit and the lower limit of the set number of turns, a signal is sent to a controller of the winding mechanism, the controller controls to cut off the power supply of the winding rotating shaft 20, the winding drum 10 stops rotating, and the winding drum 10 is prevented from being over-discharged or over-wound.
Some embodiments also provide a crane comprising the hoisting mechanism described above.
The hoist protection device is configured to prevent the wire rope on the drum 10 in the hoisting mechanism of the crane from being overwound or overdischarged, so as to prevent a safety accident from occurring.
The permanent magnet in the disclosed embodiment includes a permanent magnet.
Based on the embodiments of the utility model described above, the technical features of one of the embodiments can be advantageously combined with one or more other embodiments without explicit negatives.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the utility model. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.
Claims (10)
1. A hoisting protection device, comprising:
a housing (1);
a first shaft (21) including a first end and a second end in an axial direction, the first end of the first shaft (21) being located outside the housing (1) and configured to be connected with a hoisting rotation shaft (20), the second end of the first shaft (21) being located inside the housing (1), the first shaft (21) being rotatably disposed with respect to the housing (1);
a first permanent magnet (31) provided at a second end of the first shaft (21), the first permanent magnet (31) being configured to cause a magnetic field change with rotation of the first shaft (21); and
-a detection device (4) provided within the housing (1), the detection device (4) comprising a first magnetic field sensor configured to detect a magnetic field variation induced by the first permanent magnet (31) for obtaining a number of rotations of the first shaft (21).
2. Hoisting protection device according to claim 1, characterized in that the detection device (4) further comprises a circuit board and a control chip, the control chip being provided on the circuit board, the control chip being electrically connected to the first magnetic field sensor, the control chip being configured to receive a signal sent by the first magnetic field sensor for conversion into a number of turns of the first shaft (21).
3. The hoisting protection device of claim 1 or 2, wherein the first magnetic field sensor comprises a hall chip.
4. The hoisting protection device of claim 1, further comprising:
a first gear (51) provided on the first shaft (21);
a second shaft (22) arranged in parallel with the first shaft (21);
a second gear (52) provided to the second shaft (22), the second gear (52) meshing with the first gear (51), a gear ratio between the second gear (52) and the first gear (51) being configured such that a rotational speed of the second shaft (22) is lower than a rotational speed of the first shaft (21); and
a second permanent magnet (32) provided to the second shaft (22), the second permanent magnet (32) being configured to cause a magnetic field change with rotation of the second shaft (22);
wherein the detection device (4) further comprises a second magnetic field sensor configured to detect a magnetic field variation caused by the second permanent magnet (32) for obtaining the direction of rotation of the first shaft (21).
5. Hoisting protection device according to claim 4, characterized in that the second permanent magnet (32) is aligned with the first permanent magnet (31) in the radial direction of the second shaft (22).
6. Hoisting protection device according to claim 4, characterized in that the detection device (4) further comprises a circuit board, the first and second magnetic field sensors being arranged on the circuit board.
7. The hoist protection device of claim 4, wherein the first magnetic field sensor and the second magnetic field sensor each comprise a Hall chip.
8. Winch protection arrangement according to claim 4, characterised in that the transmission ratio between the second gear wheel (52) and the first gear wheel (51) is configured such that the second shaft (22) rotates through an angle of less than or equal to 180 degrees during the complete rotation of the first shaft (21).
9. Hoisting mechanism, characterized in that it comprises a winding drum (10), a hoisting rotating shaft (20) and a hoisting protection device according to any one of claims 1 to 8, the hoisting rotating shaft (20) being drivingly connected to the winding drum (10), the winding drum (10) being configured to wind or release a wire rope with the rotation of the hoisting rotating shaft (20), the hoisting rotating shaft (20) being connected to a first shaft (21) of the hoisting protection device.
10. A crane comprising a hoisting mechanism as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121572924.0U CN215516463U (en) | 2021-07-12 | 2021-07-12 | Hoist protection device, hoist mechanism and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121572924.0U CN215516463U (en) | 2021-07-12 | 2021-07-12 | Hoist protection device, hoist mechanism and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215516463U true CN215516463U (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121572924.0U Active CN215516463U (en) | 2021-07-12 | 2021-07-12 | Hoist protection device, hoist mechanism and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215516463U (en) |
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2021
- 2021-07-12 CN CN202121572924.0U patent/CN215516463U/en active Active
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