CN117383397A - Protection method of electromagnetic chuck lifting appliance redundancy protection system - Google Patents
Protection method of electromagnetic chuck lifting appliance redundancy protection system Download PDFInfo
- Publication number
- CN117383397A CN117383397A CN202311677842.6A CN202311677842A CN117383397A CN 117383397 A CN117383397 A CN 117383397A CN 202311677842 A CN202311677842 A CN 202311677842A CN 117383397 A CN117383397 A CN 117383397A
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- electromagnetic chuck
- lifting appliance
- chuck lifting
- shaped
- protection method
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 65
- 230000005484 gravity Effects 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/04—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by magnetic means
- B66C1/06—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by magnetic means electromagnetic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention relates to a protection method of an electromagnetic chuck lifting appliance redundancy protection system in the technical field of electromagnetic chuck lifting appliances, wherein the electromagnetic chuck lifting appliance redundancy protection system comprises an electromagnetic chuck lifting appliance, a C-shaped lifting hook and driving equipment, and the protection method comprises the following steps: s100: detecting whether the electromagnetic chuck lifting appliance has adsorbed materials by using a material detection device, if so, entering S200, otherwise, powering off the driving device; s200: detecting whether the electromagnetic chuck lifting appliance lifts the lifted object by utilizing a gravity detection device, if so, entering S300, otherwise, powering off the driving device; according to the invention, a plurality of detection devices can automatically control the action of the C-shaped lifting hook, so that the C-shaped lifting hook can timely support a hung object and prevent the hung object from falling.
Description
Technical Field
The invention relates to the technical field of electromagnetic chuck lifting appliances, in particular to a protection method of an electromagnetic chuck lifting appliance redundancy protection system.
Background
The electromagnetic chuck lifting appliance is widely applied due to high cost performance, but the risk of falling of the lifted object caused by power failure and loss of magnetism exists, and the lifted object is scrapped when serious.
At present, some electromagnetic chuck lifting appliances are provided with a power-off magnetism-keeping storage battery for solving the problems, but the storage battery has time limitation and magnetism-keeping time limitation, and the safety of a lifted object can be ensured in a short time, but the problems are not thoroughly solved.
Therefore, a protection method of the redundancy protection system of the electromagnetic chuck lifting appliance is designed.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a protection method of an electromagnetic chuck lifting appliance redundancy protection system.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the utility model provides a protection method of redundant protection system of electromagnetic chuck hoist, the redundant protection system of electromagnetic chuck hoist includes:
the top surface of the electromagnetic chuck lifting appliance is provided with a sliding fit structure;
the C-shaped lifting hook is downwards covered on the periphery of the electromagnetic chuck lifting appliance; the two side surfaces of the C-shaped lifting hook are provided with sliding grooves along the length direction of the C-shaped lifting hook, and the sliding grooves are correspondingly and slidably connected to the sliding fit structure;
the driving device is arranged at the top of the electromagnetic chuck lifting appliance and is used for driving the C-shaped lifting hook to rotate along the center of the C-shaped lifting hook;
the material detection device is arranged on the bottom surface of the electromagnetic chuck lifting appliance;
the gravity detection device is arranged at the hung part of the electromagnetic chuck hanger;
the distance detection device is arranged on the bottom surface of the electromagnetic chuck lifting appliance;
and the protection method comprises the steps of:
s100: detecting whether the electromagnetic chuck lifting appliance has adsorbed materials by using a material detection device, if so, entering S200, otherwise, powering off the driving device;
s200: detecting whether the electromagnetic chuck lifting appliance lifts the lifted object by utilizing a gravity detection device, if so, entering S300, otherwise, powering off the driving device;
s300: detecting the height of the electromagnetic chuck lifting appliance from the ground by using a distance detection device, if the height of the electromagnetic chuck lifting appliance from the ground reaches a specific distance, entering S400, otherwise entering S500;
s400: the driving device is powered on in the forward direction, the output end of the driving device rotates in the forward direction, and then the C-shaped lifting hook is driven to rotate anticlockwise, so that one end of the C-shaped lifting hook moves to the lower side of the suspended object, the suspended object is supported conveniently, and the suspended object is prevented from falling;
s500: the driving device is reversely electrified, the output end of the driving device reversely rotates, and then the C-shaped lifting hook is driven to rotate clockwise, so that one end part of the C-shaped lifting hook, which is positioned below the suspended object, is moved away, and the suspended object can be conveniently landed.
Preferably, the redundant protection system of the electromagnetic chuck lifting appliance further comprises a circuit detection device capable of detecting whether the main power supply circuit of the electromagnetic chuck lifting appliance is powered off, and the circuit detection device is used for detecting whether the main power supply circuit of the electromagnetic chuck lifting appliance is powered off after S300 and before S400, if the detection result is yes, the operation of S400 is entered, otherwise, the driving device is not powered on.
Preferably, the redundant protection system of the electromagnetic chuck lifting appliance further comprises a circuit detection device capable of detecting whether the main power supply circuit of the electromagnetic chuck lifting appliance is powered off, and the circuit detection device is used for detecting whether the main power supply circuit of the electromagnetic chuck lifting appliance is powered off after S300 and before S500, if the detection result is yes, the driving device is not powered on, and otherwise, the S500 is entered.
Preferably, the two sides of the C-shaped lifting hook corresponding to a section in the clockwise direction are provided with the sliding grooves, and the outer ends of the sliding grooves are blocked.
Preferably, limit switches which can be triggered by the corresponding chute end surfaces are arranged on two sides of the sliding fit structure; in S400 and S500, after the chute end surface triggers the limit switch, the driving device stops continuing the operation.
Preferably, the top surface of the electromagnetic chuck lifting appliance is provided with a U-shaped seat, and two inner side walls of the U-shaped seat are respectively provided with the sliding fit structure matched with the sliding groove.
Preferably, the inner side wall of the U-shaped seat is of a V-shaped or U-shaped structure, and both end parts of the opening end are provided with the sliding fit structure.
Preferably, a groove is formed in the inner side surface of the C-shaped lifting hook along the length direction, and a C-shaped rack is arranged in the groove; and the output shaft of the driving device is in transmission fit with the C-shaped rack through a gear.
Preferably, the radius of curvature of one end of the C-shaped lifting hook corresponding to the anticlockwise direction is gradually reduced from inside to outside.
Preferably, the gravity detection device is a tension sensor, a movable pulley block is arranged at the corner of the top surface of the electromagnetic chuck lifting appliance, and the gravity detection device is arranged between the bottom of the movable pulley block and the top surface of the electromagnetic chuck lifting appliance.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the invention, a plurality of detection devices can automatically control the action of the C-shaped lifting hook, so that the C-shaped lifting hook can timely support a hung object and prevent the hung object from falling.
Drawings
FIG. 1 is a schematic diagram of a redundant protection system for an electromagnetic chuck lifting appliance in the invention;
FIG. 2 is a right side view of the redundancy protection system of the electromagnetic chuck spreader of the present invention;
FIG. 3 is a schematic diagram of the structure of the electromagnetic chuck lifting tool redundancy protection system in the operation posture;
FIG. 4 is a schematic view of the assembly of the drive apparatus, C-hook and U-seat of the present invention;
FIG. 5 is a cross-sectional view of a U-shaped seat according to the present invention;
fig. 6 is a control circuit diagram of a driving apparatus in the present invention;
FIG. 7 is a schematic diagram of a control flow in the present invention.
In the figure: 1. an electromagnetic chuck lifting appliance; 11. a sliding fit structure; 12. a limit switch; 13. a U-shaped seat; 14. a movable pulley block; 2. c-shaped lifting hooks; 21. a chute; 22. a C-shaped rack; 3. a driving device; 4. a material detection device; 5. a gravity detection device; 6. distance detection means; 7. and a circuit detection device.
Detailed Description
The present invention will be explained in detail by the following examples, and the purpose of the present invention is to protect all technical improvements within the scope of the present invention, and in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., only correspond to the drawings of the present application, and in order to facilitate description of the present invention, it is not necessary to indicate or imply that the apparatus or element referred to has a specific orientation.
In an embodiment, referring to fig. 1 to 7, a protection method of an electromagnetic chuck lifting tool redundancy protection system, the electromagnetic chuck lifting tool redundancy protection system includes:
the electromagnetic chuck lifting appliance 1, the top surface of the electromagnetic chuck lifting appliance 1 is provided with a sliding fit structure 11;
according to the requirement, the corner of the top surface of the electromagnetic chuck lifting appliance 1 is provided with a movable pulley block 14.
The C-shaped lifting hook 2 is downwards covered on the periphery of the electromagnetic chuck lifting appliance 1; both side surfaces of the C-shaped lifting hook 2 are provided with sliding grooves 21 along the length direction, and the sliding grooves 21 are correspondingly and slidably connected with the sliding fit structure 11;
according to the requirement, the two sides of a section of the C-shaped lifting hook 2 corresponding to the clockwise direction are provided with sliding grooves 21, and the outer ends of the sliding grooves 21 are blocked; the top surface of the electromagnetic chuck lifting appliance 1 is provided with a U-shaped seat 13, and both inner side walls of the U-shaped seat 13 are provided with a sliding fit structure 11 matched with a chute 21; limit switches 12 which can be triggered by the end faces of the corresponding sliding grooves 21 are arranged on two sides of the sliding fit structure 11.
In one embodiment, the inner side wall of the U-shaped seat 13 is of a V-shaped or U-shaped structure, and both ends of the opening end are provided with sliding fit structures 11; this arrangement ensures the stability of the C-hook 2.
In this embodiment, limit switches 12 are disposed on the outer sides of the two sliding fit structures 11 on the inner side wall of the same U-shaped seat 13.
The driving device 3 is arranged at the top of the electromagnetic chuck lifting appliance 1 and is used for driving the C-shaped lifting hook 2 to rotate along the center of the C-shaped lifting hook;
according to the requirement, the inner side surface of the C-shaped lifting hook 2 is provided with a groove along the length direction, and a C-shaped rack 22 is arranged in the groove; the output shaft of the driving device 3 is in transmission fit with the C-shaped rack 22 through a gear.
The material detection device 4 is arranged on the bottom surface of the electromagnetic chuck lifting appliance 1;
according to the requirement, the material detection device 4 can be a proximity switch or other detection equipment capable of detecting whether the suspended object exists on the bottom surface of the electromagnetic chuck hanger 1.
The gravity detection device 5 is arranged at the hung part of the electromagnetic chuck hanger 1;
according to the requirement, the gravity detection device 5 is a tension sensor, and the gravity detection device 5 is arranged between the bottom of the movable pulley block 14 and the top surface of the electromagnetic chuck lifting appliance 1.
The distance detection device 6 is arranged on the bottom surface of the electromagnetic chuck lifting appliance 1;
the distance detection means 6 may be a distance sensor, as required.
And the protection method comprises the following steps:
s100: detecting whether the electromagnetic chuck lifting appliance 1 has adsorbed materials by using a material detection device 4, if the detection result is yes, entering into S200, otherwise, powering off the driving equipment 3;
s200: detecting whether the electromagnetic chuck lifting appliance 1 lifts the lifted object by using the gravity detection device 5, if the detection result is yes, entering into S300, otherwise, powering off the driving device 3;
s300: detecting the height of the electromagnetic chuck lifting appliance from the ground by using the distance detection device 6, if the height of the electromagnetic chuck lifting appliance from the ground reaches a specific distance, entering S400, otherwise entering S500;
s400: the driving device 3 is powered on in the forward direction, the output end of the driving device 3 rotates in the forward direction, and then the C-shaped lifting hook 2 is driven to rotate anticlockwise, so that one end of the C-shaped lifting hook 2 moves to the lower side of the suspended object, the suspended object is supported conveniently, and the suspended object is prevented from falling;
s500: the driving device 3 is reversely electrified, the output end of the driving device 3 reversely rotates, and then the C-shaped lifting hook 2 is driven to rotate clockwise, so that one end part of the C-shaped lifting hook 2 below the hung object is moved away, and the hung object can be conveniently landed.
When the limit switch 12 is present, in S400 and S500, the driving device 3 stops continuing the operation after the end face of the chute 21 triggers the limit switch 12.
In this embodiment, the detection distance of the distance detection device 6 is greater than the distance between the bottom surface of the C-shaped hook 2 and the bottom surface of the electromagnetic chuck lifting tool 1 in the working posture of the C-shaped hook 2, and the radius of the C-shaped hook 2 is designed according to the actual requirement, so the detection distance of the distance detection device 6 is not particularly limited. For example, when the distance between the bottom surface of the C-shaped hook 2 and the bottom surface of the electromagnetic chuck spreader 1 is 800mm in the working posture of the C-shaped hook 2, the detection distance of the distance detection device 6 is preferably 850 to 900mm.
When the lifting device ascends, after the electromagnetic chuck lifting device 1 adsorbs materials, the electromagnetic chuck lifting device 1 and a lifted object are enabled to pass through the crane, when the distance detection device 6 cannot detect the ground, the driving device 3 is electrified forward, the output end of the driving device 3 rotates forward, and then the C-shaped lifting hook 2 is driven to rotate anticlockwise, so that one end part of the C-shaped lifting hook 2 moves below the lifted object, the lifted object is supported conveniently, and the lifted object is prevented from falling; when the distance detection device 6 detects the ground during descent, the driving device 3 is electrified reversely, the output end of the driving device 3 rotates reversely, and then the C-shaped lifting hook 2 is driven to rotate clockwise, so that one end of the C-shaped lifting hook 2 below the suspended object is moved away, and the suspended object is conveniently landed.
In the second embodiment, referring to fig. 1 to 7, a protection method of an electromagnetic chuck lifting tool redundancy protection system is provided, and based on the first embodiment, the electromagnetic chuck lifting tool redundancy protection system further includes a circuit detection device 7 capable of detecting whether a main power supply circuit of the electromagnetic chuck lifting tool 1 is powered off, and after S300 and before S400, the circuit detection device 7 is used to detect whether the main power supply circuit of the electromagnetic chuck lifting tool 1 is powered off, if the detection result is yes, the operation goes to S400, otherwise, the driving device 3 is not powered on.
In this embodiment, the redundant protection system of the electromagnetic chuck lifting appliance further has a standby power supply in the prior art, but compared with the standby power supply in the prior art, the standby power supply has small energy storage, and can only last the operation duration of the C-shaped lifting hook 2.
When the lifting device is used, after a lifted object is lifted off, and after the main power supply circuit of the electromagnetic chuck lifting device 1 is detected to be powered off, the standby power supply supplies power to the electromagnetic chuck lifting device 1, at the moment, the driving device 3 is powered on positively, the output end of the driving device 3 rotates positively, and then the C-shaped lifting hook 2 is driven to rotate anticlockwise, so that one end part of the C-shaped lifting hook 2 moves to the lower part of the lifted object, the lifted object is supported conveniently, and the lifted object is prevented from falling.
In the third embodiment, referring to fig. 1 to 7, a protection method of an electromagnetic chuck lifting tool redundancy protection system is provided, and on the basis of the first or second embodiment, the electromagnetic chuck lifting tool redundancy protection system further includes a circuit detection device 7 capable of detecting whether a main power supply circuit of the electromagnetic chuck lifting tool 1 is powered off, and after S300 and before S500, the circuit detection device 7 is used to detect whether the main power supply circuit of the electromagnetic chuck lifting tool 1 is powered off, if the detection result is yes, the driving device 3 is not powered on, otherwise, the operation goes to S500.
The device is arranged under the condition that the main power supply circuit of the electromagnetic chuck lifting appliance 1 is powered off and demagnetized, at the moment, the driving device 3 is not powered on, namely, the lifted object is supported by the C-shaped lifting hook 2, at the moment, the driving device 3 is not powered on, the lifted object cannot fall off, and under the condition that the main power supply circuit of the electromagnetic chuck lifting appliance 1, the lifted object is adsorbed by the electromagnetic chuck lifting appliance 1, so that the lifted object can be normally grounded.
The invention has not been described in detail in the prior art, and it is apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and range of equivalency are intended to be embraced therein.
Claims (10)
1. A protection method of an electromagnetic chuck lifting appliance redundancy protection system is characterized by comprising the following steps of: the redundancy protection system of the electromagnetic chuck lifting appliance comprises:
the electromagnetic chuck lifting tool (1), wherein a sliding fit structure (11) is arranged on the top surface of the electromagnetic chuck lifting tool (1);
the C-shaped lifting hook (2) is downwards covered on the periphery of the electromagnetic chuck lifting appliance (1) in an opening manner; both side surfaces of the C-shaped lifting hook (2) are provided with sliding grooves (21) along the length direction, and the sliding grooves (21) are correspondingly connected to the sliding matching structure (11) in a sliding manner;
the driving device (3) is arranged at the top of the electromagnetic chuck lifting appliance (1) and is used for driving the C-shaped lifting hook (2) to rotate along the center of the C-shaped lifting hook;
the material detection device (4) is arranged on the bottom surface of the electromagnetic chuck lifting appliance (1);
the gravity detection device (5) is arranged at the hung part of the electromagnetic chuck hanger (1);
the distance detection device (6) is arranged on the bottom surface of the electromagnetic chuck lifting appliance (1);
and the protection method comprises the steps of:
s100: detecting whether the electromagnetic chuck lifting tool (1) has adsorbed materials or not by using a material detection device (4), if the detection result is yes, entering into S200, otherwise, powering off the driving equipment (3);
s200: detecting whether the electromagnetic chuck lifting appliance (1) lifts the lifted object by utilizing the gravity detection device (5), if the detection result is yes, entering into S300, otherwise, powering off the driving equipment (3);
s300: detecting the height of the electromagnetic chuck lifting appliance from the ground by using a distance detection device (6), if the height of the electromagnetic chuck lifting appliance from the ground reaches a specific distance, entering S400, otherwise entering S500;
s400: the driving device (3) is powered on positively, the output end of the driving device (3) rotates positively, and then the C-shaped lifting hook (2) is driven to rotate anticlockwise, so that one end part of the C-shaped lifting hook (2) moves to the lower part of a lifted object, the lifted object is supported conveniently, and the lifted object is prevented from falling;
s500: the driving device (3) is reversely electrified, the output end of the driving device (3) reversely rotates, and then the C-shaped lifting hook (2) is driven to rotate clockwise, so that one end part of the C-shaped lifting hook (2) positioned below the hung object is moved away, and the hung object can be conveniently landed.
2. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: the redundancy protection system of the electromagnetic chuck lifting appliance further comprises a circuit detection device (7) capable of detecting whether a main power supply circuit of the electromagnetic chuck lifting appliance (1) is powered off, the circuit detection device (7) is used for detecting whether the main power supply circuit of the electromagnetic chuck lifting appliance (1) is powered off after S300 and before S400, if the detection result is yes, the operation of S400 is carried out, and otherwise, the driving device (3) is powered off.
3. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: the redundancy protection system of the electromagnetic chuck lifting appliance further comprises a circuit detection device (7) capable of detecting whether a main power supply circuit of the electromagnetic chuck lifting appliance (1) is powered off, the circuit detection device (7) is used for detecting whether the main power supply circuit of the electromagnetic chuck lifting appliance (1) is powered off after S300 and before S500, if the detection result is yes, the driving equipment (3) is not powered on, and otherwise, the system enters S500.
4. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: the C-shaped lifting hook (2) is provided with sliding grooves (21) on two sides of a section corresponding to the clockwise direction, and the outer ends of the sliding grooves (21) are blocked.
5. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 4, wherein the protection method comprises the following steps: limit switches (12) which can be triggered by the end faces of the corresponding sliding grooves (21) are arranged on two sides of the sliding fit structure (11); in S400 and S500, after the end face of the chute (21) triggers the limit switch (12), the driving device (3) stops continuing operation.
6. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: the electromagnetic chuck lifting appliance is characterized in that a U-shaped seat (13) is arranged on the top surface of the electromagnetic chuck lifting appliance (1), and sliding fit structures (11) matched with sliding grooves (21) are arranged on two inner side walls of the U-shaped seat (13).
7. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 6, wherein the protection method comprises the following steps: the inner side wall of the U-shaped seat (13) is of a V-shaped or U-shaped structure, and both ends of the opening end are provided with the sliding fit structure (11).
8. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: the inner side surface of the C-shaped lifting hook (2) is provided with a groove along the length direction, and a C-shaped rack (22) is arranged in the groove; the output shaft of the driving device (3) is in transmission fit with the C-shaped rack (22) through a gear.
9. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: one end of the C-shaped lifting hook (2) corresponding to the anticlockwise direction gradually reduces from inside to outside in curvature radius.
10. The protection method of the redundancy protection system of the electromagnetic chuck lifting appliance according to claim 1, wherein the protection method comprises the following steps: the gravity detection device (5) is a tension sensor, a movable pulley block (14) is arranged at the corner of the top surface of the electromagnetic chuck lifting appliance (1), and the gravity detection device (5) is arranged between the bottom of the movable pulley block (14) and the top surface of the electromagnetic chuck lifting appliance (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311677842.6A CN117383397A (en) | 2023-12-08 | 2023-12-08 | Protection method of electromagnetic chuck lifting appliance redundancy protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311677842.6A CN117383397A (en) | 2023-12-08 | 2023-12-08 | Protection method of electromagnetic chuck lifting appliance redundancy protection system |
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| CN117383397A true CN117383397A (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311677842.6A Pending CN117383397A (en) | 2023-12-08 | 2023-12-08 | Protection method of electromagnetic chuck lifting appliance redundancy protection system |
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| CN (1) | CN117383397A (en) |
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