Large-tonnage load electric locking and unlocking device

Abstract

The invention relates to the technical field of electric locking and unlocking, and discloses a large-tonnage load electric locking and unlocking device which comprises a base, two locking blocks, two locking hooks and two electric driving assemblies. Wherein the base is in an arc shape, an opening of the base faces upwards, the two locking blocks are symmetrically arranged on the two sides of a load, the two locking hooks are hinged to the two ends of the bottom face of the base respectively and matched with the two locking blocks respectively, the two electric driving assemblies are hinged to the two ends of the bottom face of the base respectively, and the two electric driving assemblies are arranged opposite to the two locking hooks respectively. When the push rod stretches out and draws back, the corresponding locking hook is driven to be close to or away from the corresponding locking block so as to press or loosen the locking block, and then the load is locked or unlocked. According to the invention, the ball screw pair which is free of resistance and high in transmission efficiency is adopted to drive the locking hook to unlock, the small-torque brake is adopted at the motor end for braking to realize locking, the relationship between locking and unlocking is balanced, and the bearing of a large-tonnage load and the resistance-free screw-slip unlocking under large tonnage are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electric locking and unlocking, and in particular to a large-tonnage load electric locking and unlocking device. Background Art

[0002] Traditional large-tonnage loads are mostly hydraulically driven, which have the advantages of large bearing capacity, hydraulic buffering, and no mechanical jamming during unloading. Electric mechanisms are mostly motor-driven mechanical transmission mechanisms, which usually require a large power source and a complex transmission mechanism. With the rapid development of electric drive, electric drive has gradually replaced the complex and bulky hydraulic drive with its compact structure, easy maintenance and simple operation. Electric drive is also increasingly developing towards large loads. Large-tonnage, multi-stage electric cylinders are used in industrial products such as simulators, lifting and erecting due to their high precision and reliability.

[0003] This kind of product traditionally uses the advantages of self-locking structure, and mostly adopts electric drive locking and unlocking actions, while the load-bearing adopts mechanical structure load-bearing to avoid the load being transferred to the drive device, that is, the mode of separation of drive and load-bearing, which improves space utilization and cost, and realizes reliable locking in limited space. However, this traditional mode has a dead point when unlocking under load, especially for large tonnage loads, and faces the contradiction between self-locking load-locking and load-unlocking, that is, the structure must be locked firmly, and the self-locking must disappear instantly when unlocking, but the locking and unlocking devices in the existing technology cannot achieve both functions at the same time. Summary of the invention

[0004] The purpose of the present invention is to provide a large-tonnage load electric locking and unlocking device to solve the technical problems in the prior art.

[0005] In order to achieve the above object, the present invention provides a large-tonnage load electric locking and unlocking device, comprising:

[0006] A base, the base is arc-shaped with an opening facing upward;

[0007] A locking block, wherein two locking blocks are provided, and the two locking blocks are symmetrically arranged on both sides of the load;

[0008] A locking hook, wherein two locking hooks are provided, and the two locking hooks are respectively hinged to the two ends of the bottom surface of the base, and are respectively provided in cooperation with the two locking blocks;

[0009] An electric drive assembly, wherein two of the electric drive assemblies are provided, and the two electric drive assemblies are respectively hinged at the two ends of the bottom surface of the base, and the two electric drive assemblies are respectively arranged opposite to the two locking hooks. The electric drive assembly includes a shell and a brake, a motor, a ball screw pair and a push rod arranged in the shell, the brake is connected to the motor, and the motor is transmission-connected to the ball screw pair, the push rod is arranged on the ball screw pair, and one end of the push rod away from the ball screw pair extends out of the shell and is hinged to the side of the locking hook, and the ball screw pair is used to convert the rotational motion of the motor into a linear telescopic motion of the push rod, and when the push rod is telescoped, it drives the corresponding locking hook to approach or move away from the corresponding locking block to compress or release the locking block, thereby locking or unlocking the load.

[0010] Preferably, the motor and the ball screw pair are transmitted through a transmission mechanism, and the transmission mechanism is arranged in the housing. The transmission mechanism includes a transmission gear arranged on the output shaft of the motor, an intermediate gear meshing with the transmission gear, and a driven gear meshing with the intermediate gear, and the driven gear is transmission-connected to the ball screw pair.

[0011] Preferably, the electric drive assembly further comprises a clutch arranged in the housing, and the clutch is used to drive the intermediate gear to move up and down so that the intermediate gear is disengaged or engaged with the driving gear.

[0012] Preferably, the clutch includes a transmission shaft, a top block sleeved on the outer side of the transmission shaft, a compression spring, a pushing block, a threaded tube, a tightening nut and a pushing rod arranged between the intermediate gear and the pushing block. The transmission shaft is sleeved on the middle part of the intermediate gear, the top end of which is rotatably connected with the top of the inner cavity of the shell, and the bottom end of which passes downward through and extends out of the shell, and the intermediate gear can move up and down relative to the transmission shaft, the top block and the pushing rod are respectively arranged at the top and bottom of the intermediate gear, the compression spring is arranged between the top block and the top wall of the inner cavity of the shell, and when the intermediate gear rotates, the top block and the pushing rod are always in a stationary state, the threaded tube is arranged at the bottom of the shell, the pushing block is movably sleeved on the outer side of the threaded tube, the bottom of the pushing rod extends downward out of the shell and is fixedly connected to the pushing block, and the tightening nut is threadedly sleeved on the outer side of the threaded tube and abuts against the pushing block.

[0013] Preferably, the clutch further comprises a protective cover, and the protective cover is sleeved on the outer side of the tightening nut.

[0014] Preferably, a transition gear is arranged between the transmission shaft and the intermediate gear, the transition gear is sleeved on the outer side of the transmission shaft, the intermediate gear is arranged on the outer side of the intermediate gear, and the inner side of the intermediate gear is provided with internal teeth that mesh with the external teeth of the transition gear.

[0015] Preferably, the electric drive assembly further comprises a limit switch, and the limit switch is arranged on the base.

[0016] Preferably, an L-shaped mounting ear seat is provided on the bottom side of the base, the mounting end of the electric drive mechanism is hinged to the end of the horizontal rod of the mounting ear seat, and the bottom end of the locking hook is hinged to the end of the vertical rod of the mounting ear seat.

[0017] Preferably, the locking hook is in the shape of a "7", the end of the vertical rod of the locking hook is hinged to the end of the vertical rod of the mounting ear seat, the side of the vertical rod of the locking hook is hinged to the push rod, and the push rod drives the cross rod of the locking hook to tighten or loosen the locking block and thereby lock or unlock the load.

[0018] Preferably, an adjusting bolt is provided on the cross bar of the locking hook.

[0019] The beneficial effects of the present invention are:

[0020] (1) A ball screw pair with no resistance and high transmission efficiency is used to drive the locking hook to unlock, and a small torque brake is used at the motor end to achieve locking, balancing the relationship between locking and unlocking, ensuring the bearing of large tonnage loads and smooth unlocking without resistance under large tonnage.

[0021] (2) The overall structure adopts a structure in which a large-tonnage motor drives the locking hook to swing outward. The mechanism has no dead points in the locking and unlocking range, effectively converting the load into the driving force for unlocking, and the unlocking is reliable.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic structural diagram of a large-tonnage load electric locking and unlocking device according to an embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram of a large-tonnage load electric locking and unlocking device and a load assembly is shown in accordance with an embodiment of the present invention;

[0026] Figure 3 A schematic diagram showing a locked state of a large-tonnage load electric locking and unlocking device according to an embodiment of the present invention is shown;

[0027] Figure 4 A schematic diagram of an unlocking state of a large-tonnage load electric locking and unlocking device according to an embodiment of the present invention is shown;

[0028] Figure 5 A schematic diagram of the internal structure of a housing according to an embodiment of the present invention is shown (automatic state);

[0029] Figure 6 A schematic diagram of the internal structure of a housing according to an embodiment of the present invention is shown (manual state);

[0030] Figure 7 A mechanical analysis diagram of a large-tonnage load electric locking and unlocking device according to an embodiment of the present invention is shown.

[0031] Description of reference numerals:

[0032] 1 base, 11 mounting ear seat, 12 bottom mounting seat;

[0033] 2 locking block, 3 locking hook, 31 adjusting bolt;

[0034] 4 electric drive assembly, 41 housing, 42 brake, 43 motor, 44 ball screw pair, 45 push rod, 46 transmission mechanism, 47 clutch, 48 limit switch;

[0035] 461 transmission gear, 462 intermediate gear, 463 driven gear;

[0036] 471 transmission shaft, 472 top block, 473 compression spring, 474 push block, 475 threaded tube, 476 top nut, 477 push rod, 478 protection cover. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0038] Please refer to Figure 1-Figure 7The present embodiment provides an electric locking and unlocking device for a large-tonnage load, including a base 1, two locking blocks 2, two locking hooks 3 and two electric drive components 4. The base 1 is arc-shaped with an opening facing upward. It is specifically an arc-shaped bracket. The shape of the top surface is adapted to the shape of the outer wall of the load, so that the load can be better installed. A bottom mounting seat 12 is provided in the middle of the bottom of the base 1. Mounting holes are provided at the four corners of the bottom mounting seat 12. The base 1 is fixed to the vehicle by screws passing through the mounting holes. Mounting ear plates 11 are provided at both ends of the side surface of the base 1. In the present embodiment, the mounting ear plate 11 is L-shaped, which is connected by a horizontal bar and a vertical bar, and is used to install the locking hook 3 and the electric drive component 4.

[0039] The two locking blocks 2 are symmetrically arranged on both sides of the load, the two locking hooks 3 are respectively hinged at the two ends of the bottom surface of the base 1, and are respectively arranged in cooperation with the two locking blocks 2, the two electric drive components 4 are respectively hinged at the two ends of the bottom surface of the base 1, and the two electric drive components 4 are respectively arranged opposite to the two locking hooks 3, the electric drive component 4 includes a shell 41 and a brake 42, a motor 43, a ball screw pair 44 and a push rod 45 arranged in the shell 41, the brake 42 is connected to the motor 42, the motor 43 is transmission-connected to the ball screw pair 44, the push rod 45 is arranged on the ball screw pair 44, one end of the push rod 45 away from the ball screw pair 44 extends out of the shell 41 and is hinged to the side of the locking hook 3, the ball screw pair 44 is used to convert the rotational motion of the motor 43 into the linear telescopic motion of the push rod 45, and when the push rod 45 is telescopic, it drives the corresponding locking hook 3 to approach or move away from the corresponding locking block 2 to compress or release the locking block 2, thereby locking or unlocking the load.

[0040] Specifically, the bottom of the housing 41 is hinged to the end of the horizontal rod of the mounting ear seat 11, and the bottom end of the locking hook 3 is hinged to the end of the vertical rod of the mounting ear seat 11. In this embodiment, the locking hook 3 is in a "7" shape, the end of the vertical rod of the locking hook 3 is hinged to the end of the vertical rod of the mounting ear seat 101, and the side of the vertical rod of the locking hook 3 is hinged to the push rod 45, and the push rod 45 drives the horizontal rod of the locking hook 3 to press or release the locking block 2 to lock or unlock the load.

[0041] The working principle of the ball screw pair is to use the balls rolling on the screw threads to convert the rotational motion into linear motion. The ball screw pair is composed of a screw, a nut and balls. The balls are installed in the ball circulation channel inside the nut. When the screw rotates, the balls roll in the channel and push the nut to move along the axial direction of the screw. This structural design makes the ball screw pair have higher efficiency and load-bearing capacity, and is suitable for working environments that require high precision and high load. In this embodiment, the push rod 45 is arranged on the nut, and the motor 43 drives the screw of the ball screw pair 44 to rotate, and its nut moves along the axial direction of the screw, thereby driving the push rod 45 to move along the axial direction of the screw, and then driving the locking hook 3 to tighten or release the locking block 2. It should be noted that the hinges in this embodiment are all hinged by pins.

[0042] In this embodiment, the brake 42 and the motor 43 are electromagnetically connected, which is a common connection method in the prior art. This embodiment does not improve the brake 42 and the motor 43. In the prior art, the brake mainly includes brake pads, armature plates, coil components, springs and other structures. Its working principle is that the tail shaft of the motor 43 is connected to the brake pad of the brake 42. When the coil component is powered on, the armature plate is attracted downward by the magnetic force generated by the coil and disengaged from the brake pad, and the shaft of the motor 43 can rotate normally; when the coil component is powered off, the magnetic field disappears, the armature plate is reset under the action of the spring, and fits with the brake pad to perform a braking action, and the shaft of the motor 43 cannot rotate.

[0043] The locking and unlocking device in this embodiment adopts a resistance-free, high-transmission-efficiency ball screw pair 44 to drive the locking hook 3 to unlock, and adopts a small-torque brake 42 at the motor end to achieve locking, ensuring resistance-free and smooth unlocking under large tonnage and large loads. The overall structure adopts a connecting rod slider mechanism with no dead points in the unlocking range, effectively converting the load force into the driving force for unlocking, and reliable unlocking, which solves the contradiction between locking and unlocking, achieves resistance-free or low-resistance unlocking, ensures smooth unlocking, and breaks through the conventional self-locking screw nut pair to achieve locking load.

[0044] Preferably, the motor 43 and the ball screw pair 44 are transmitted through a transmission mechanism 46, the transmission mechanism 46 is arranged in the housing 41, and the transmission mechanism 46 includes a transmission gear 461 arranged on the output shaft of the motor 43, an intermediate gear 462 meshing with the transmission gear 461, and a driven gear 463 meshing with the intermediate gear 462, and the driven gear 463 is connected to the ball screw pair 44 by transmission. The ball screw pair 44 is transmitted by gear transmission, and the transmission principle is simple and the structure is compact. Of course, it can also be transmitted by a sprocket and a chain, and a belt and a belt pulley. The motor 43 realizes a large load linear drive through the transmission mechanism 46 and the ball screw pair 44, and has no self-locking function, which is convenient for unlocking with small resistance or even without resistance, so as to achieve the purpose of reliable unlocking.

[0045] Preferably, the electric drive assembly 4 further includes a clutch 47 disposed in the housing 41, and the clutch 47 is used to drive the intermediate gear 462 to move up and down so that the intermediate gear 462 is disengaged or engaged with the driving gear 461. The clutch 47 cuts off the brake, and when manually operated, the overall structure has no self-locking, ensuring reliable unlocking.

[0046] Please refer to Figure 5 and Figure 6 The clutch 47 includes a transmission shaft 471, a top block 472 sleeved on the outside of the transmission shaft 471, a compression spring 473, a push block 474, a threaded tube 475, a tightening nut 476, and a push rod 477 arranged between the intermediate gear 462 and the push block 474. The transmission shaft 471 is sleeved on the middle part of the intermediate gear 462, and its top end is rotatably connected to the top of the inner cavity of the shell 41, and its bottom end passes downward and extends out of the shell 41. The intermediate gear 462 can move up and down relative to the transmission shaft 471, and the top block 472 and the push rod 477 are separated. They are respectively arranged at the top and bottom of the intermediate gear 462, and the clamping spring 473 is arranged between the top block 472 and the top wall of the inner cavity of the shell 41. When the intermediate gear 462 rotates, the top block 472 and the pushing rod 477 are always in a stationary state. The threaded tube 475 is arranged at the bottom of the shell 41, and the pushing block 474 is movably sleeved on the outer side of the threaded tube 475. The bottom of the pushing rod 477 extends downward out of the shell 41 and is fixedly connected to the pushing block 474. The tightening nut 476 is threadedly sleeved on the outer side of the threaded tube 475 and abuts against the pushing block 474.

[0047] In this embodiment, in order to facilitate the up and down movement of the intermediate gear 462, a transition gear is provided between the transmission shaft 471 and the intermediate gear 462, the transition gear is sleeved on the outer side of the transmission shaft 471, the intermediate gear 462 is provided on the outer side of the intermediate gear 462, and the inner side of the intermediate gear 462 is provided with internal teeth that mesh with the external teeth of the transition gear. In this way, when the transmission shaft 471 rotates, the intermediate gear 462 can be driven to rotate by the transition gear. When adjusting the intermediate gear 462 to move up and down, the teeth of the transition gear can provide it with a guide and a track to ensure the safe operation of the equipment. In addition, the connection between the transmission shaft 471 and the housing 41 is provided with a bearing to improve the transmission efficiency. In addition, in order to keep the top block 472 and the push rod 477 stationary when the intermediate gear 462 rotates, a bearing can also be set at the bottom of the intermediate gear 462, and the push rod 477 is transmission-connected to the bearing (of course, a similar design can also be made between the intermediate gear 462 and the top block 472). Moreover, a guide hole or a linear bearing is set at the connection between the push rod 477 and the outer shell 41 to ensure that the push rod 477 can move up and down while operating stably.

[0048] Please refer to Figure 5 , Figure 6 and Figure 7 When in use, in the automatic state, the driving gear 461, the intermediate gear 462 and the driven gear 463 are meshed and transmitted. When it is necessary to switch to the manual state, the top nut 476 can be rotated, and the top nut 476 makes a spiral motion upward under the action of the thread, thereby pushing the push block 474 to move upward, and then the intermediate gear 462 is moved upward by the push rod 477 to squeeze the compression spring 473, so that the intermediate gear 462 is disengaged from the driving gear 461, and the driven gear 463 is braked and disengaged from the motor 43, so as to realize the electric / manual switching. After the manual switching, the locking device is in a free state, and the whole mechanism is not self-locking, so that the unlocking without resistance can be realized. Specifically, the transmission shaft 471 can be rotated by external force or using a tool to realize the extension and retraction of the push rod to realize the unlocking. The intermediate gear 462 in this embodiment is mutually squeezed by the top nut 476 and the compression spring 473 to ensure that the intermediate gear 462 can rotate stably, so that the intermediate gear 462 will not move up and down when rotating, thereby improving the stability of the transmission.

[0049] Preferably, the clutch 47 further comprises a protective cover 478, which is sleeved on the outside of the jacking nut 476. The protective cover 478 can improve the safety of the device, and when manual switching is required, the protective cover 478 can be removed for manual adjustment.

[0050] Preferably, a transition gear is arranged between the transmission shaft 471 and the intermediate gear 462, the transition gear is sleeved on the outer side of the transmission shaft 471, the intermediate gear 462 is arranged on the outer side of the intermediate gear 462, and the inner side of the intermediate gear 462 is provided with internal teeth that mesh with the external teeth of the transition gear.

[0051] Preferably, the electric drive assembly 4 further includes a limit switch 48, which is disposed on the base 1. The limit switch 48 can detect whether the locking hook 3 is in a locked state or an unlocked state, thereby facilitating subsequent operations.

[0052] Preferably, an adjusting bolt 31 is provided on the cross bar of the locking hook 3. The adjusting bolt 31 is threadedly connected to the cross bar of the locking hook 3. During operation, the adjusting bolt 31 can be rotated to adjust the depth of the adjusting bolt 3 screwed into the locking hook 3 so that the large end of the adjusting bolt 31 is level with the contact surface of the locking block 2 in the locked state, ensuring that the cross bar is only subjected to normal force.

[0053] The specific working principle includes automatic unlocking and locking and manual unlocking and locking, please refer to Figure 3-Figure 7 .

[0054] Automatic unlocking and locking:

[0055] a) There is a gap between the locking hook 3 and the locking block 2:

[0056] Unlocking process: when power is turned on, the brake 42 and the motor 43 act at the same time, the brake 42 is powered on, the brake 42 is disengaged from the motor 43, the motor 43 drives the push rod to retract, the locking hook 3 swings outward, the locking hook 3 is disengaged from the locking block 2, and unlocking is achieved; when power is turned off, the motor 43 and the brake 42 are powered off at the same time, the shaft of the motor 43 engages with the brake pad, the brake is applied, and the unlocking is in place.

[0057] Locking process: when power is turned on, the brake 42 and the motor 43 act at the same time, the brake 42 is powered on, the brake 42 is disengaged from the motor 43, the motor 43 drives the push rod to extend, driving the locking hook 3 to reach the locking position, the locking hook 3 contacts the locking block 2, and the locking action is realized; when power is turned off, the motor 43 and the brake 42 are powered off at the same time, the shaft of the motor 43 engages with the brake pad, the brake is applied, and the brake is locked in place.

[0058] b) The lock hook contacts the corner block to unlock:

[0059] The locking hook 3 generates a large tonnage contact force with the locking block 2 due to the load, and the normal unlocking torque generated by the friction coefficient contact force on the locking hook 3 is greater than the resistance torque generated by the contact friction force. The brake balance maintains the locked state; the brake clutch is disengaged, and the contact torque is the unlocking power, ensuring reliable unlocking.

[0060] Manual unlocking and locking: Tighten the locking nut 476, the compression spring 473 is compressed, the intermediate gear 462 is disengaged from the driving gear 461, and the friction coefficient is When the contact torque is positive, the lock is unlocked automatically. When the contact torque is negative, the transmission shaft 471 can be rotated with the help of external force or a tool to extend and retract the push rod to achieve unlocking.

[0061] To sum up, the large-tonnage load electric locking and unlocking device in the present invention adopts a motor 42 to drive a non-self-locking ball screw pair 44 to realize the conversion from rotation to linear output motion. A small torque brake 42 is set at the motor end to realize locking, ensuring resistance-free and smooth unlocking under large tonnage load and large load. The overall structure adopts a connecting rod mechanism to drive the locking hook 3 to move back and forth toward the locking block 2. There is no dead point in the unlocking range, and the load force is effectively converted into the driving force for unlocking. The unlocking is reliable, which solves the contradiction between locking and unlocking, realizes unlocking without resistance or with small resistance, ensures smooth unlocking, breaks through the conventional self-locking screw nut pair to realize locking load, and adopts a transmission pair with no self-locking and high transmission efficiency to realize locking of large tonnage loads in limited space.

[0062] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0063] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A large-tonnage load electric locking and unlocking device, characterized in that: include: A base (1), wherein the base (1) is arc-shaped and has an opening facing upward; A locking block (2), wherein two locking blocks (2) are provided, and the two locking blocks (2) are symmetrically arranged on both sides of the load; A locking hook (3), wherein two locking hooks (3) are provided, and the two locking hooks (3) are respectively hinged to the two ends of the bottom surface of the base (1), and are respectively provided in cooperation with the two locking blocks (2); An electric drive assembly (4), wherein two electric drive assemblies (4) are provided, the two electric drive assemblies (4) are respectively hinged to the two ends of the bottom surface of the base (1), the two electric drive assemblies (4) are respectively arranged opposite to the two locking hooks (3), the electric drive assembly (4) comprises a housing (41) and a brake (42), a motor (43), a ball screw pair (44) and a push rod (45) arranged in the housing (41), the brake (42) is connected to the motor (42), the motor (43) is connected to the ball screw pair (44) The push rod (45) is arranged on the ball screw pair (44), and one end of the push rod (45) away from the ball screw pair (44) extends out of the housing (41) and is hinged to the side of the locking hook (3). The ball screw pair (44) is used to convert the rotational motion of the motor (43) into the linear telescopic motion of the push rod (45). When the push rod (45) is telescoped, it drives the corresponding locking hook (3) to move closer to or away from the corresponding locking block (2) to compress or release the locking block (2), thereby locking or unlocking the load.

2. The large-tonnage load electric locking and unlocking device according to claim 1 is characterized in that: The motor (43) and the ball screw pair (44) are driven by a transmission mechanism (46). The transmission mechanism (46) is arranged in the housing (41). The transmission mechanism (46) comprises a transmission gear (461) arranged on the output shaft of the motor (43), an intermediate gear (462) meshing with the transmission gear (461), and a driven gear (463) meshing with the intermediate gear (462). The driven gear (463) is connected to the ball screw pair (44) by transmission.

3. The large-tonnage load electric locking and unlocking device according to claim 2 is characterized in that: The electric drive assembly (4) further comprises a clutch (47) disposed in the housing (41), the clutch (47) being used to drive the intermediate gear (462) to move up and down so that the intermediate gear (462) is disengaged from or engaged with the driving gear (461).

4. The large-tonnage load electric locking and unlocking device according to claim 3 is characterized in that: The clutch (47) comprises a transmission shaft (471), a top block (472) sleeved on the outside of the transmission shaft (471), a compression spring (473), a push block (474), a threaded tube (475), a tightening nut (476), and a push rod (477) arranged between the intermediate gear (462) and the push block (474). The transmission shaft (471) is sleeved on the middle part of the intermediate gear (462), and its top end is rotatably connected to the top of the inner cavity of the shell (41), and its bottom end passes downward and extends out of the shell (41). The intermediate gear (462) can move up and down relative to the transmission shaft (471). The top block (472) and the push rod (477) are respectively arranged at The top and bottom of the intermediate gear (462), the clamping spring (473) is arranged between the top block (472) and the top wall of the inner cavity of the outer shell (41), when the intermediate gear (462) rotates, the top block (472) and the push rod (477) are always in a stationary state, the threaded tube (475) is arranged at the bottom of the outer shell (41), the push block (474) is movably sleeved on the outer side of the threaded tube (475), the bottom of the push rod (477) extends downward out of the outer shell (41) and is fixedly connected to the push block (474), the clamping nut (476) is threadedly sleeved on the outer side of the threaded tube (475) and abuts against the push block (474).

5. The large-tonnage load electric locking and unlocking device according to claim 4 is characterized in that: The clutch (47) further comprises a protective cover (478), wherein the protective cover (478) is sleeved on the outer side of the tightening nut (476).

6. The large-tonnage load electric locking and unlocking device according to claim 5 is characterized in that: A transition gear is arranged between the transmission shaft (471) and the intermediate gear (462), the transition gear is sleeved on the outer side of the transmission shaft (471), the intermediate gear (462) is arranged on the outer side of the intermediate gear (462), and the inner side of the intermediate gear (462) is provided with internal teeth that mesh with the external teeth of the transition gear.

7. The large-tonnage load electric locking and unlocking device according to claim 1 is characterized in that: The electric drive assembly (4) further comprises a limit switch (48), wherein the limit switch (48) is arranged on the base (1).

8. The large-tonnage load electric locking and unlocking device according to any one of claims 1 to 7, characterized in that: An L-shaped mounting ear seat (11) is provided on the bottom side of the base (1), the mounting end of the electric drive mechanism (21) is hinged to the end of the horizontal rod of the mounting ear seat (11), and the bottom end of the locking hook (3) is hinged to the end of the vertical rod of the mounting ear seat (11).

9. The large-tonnage load electric locking and unlocking device according to claim 8, characterized in that: The locking hook (3) is in the shape of a letter "7", the end of the vertical rod of the locking hook (3) is hinged to the end of the vertical rod of the mounting ear seat (11), the side of the vertical rod of the locking hook (3) is hinged to the push rod (45), and the push rod (45) drives the cross rod of the locking hook (3) to press or release the locking block (2) and thereby lock or unlock the load.

10. The large-tonnage load electric locking and unlocking device according to claim 9, characterized in that: An adjusting bolt (31) is arranged on the crossbar of the locking hook (3).

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