Lifting equipment and clutch device thereof

Abstract

The utility model belongs to the technical field of general configuration of a platform comprising passenger protection equipment, and particularly provides lifting equipment and a clutch device thereof. According to the clutch device, the electromagnet with the pull rod is adopted to drive the hook claw to swing, when the electromagnet is electrified, the pull rod acts to pull the hook claw to swing to a hook locking state, and when the electromagnet loses power, the pull rod acts to push the hook claw to swing to an unlocking state. The lifting equipment comprises the clutch device. Under extreme conditions, if the linear driving mechanism breaks down and is stuck in the process of pulling the lifting column to ascend or descend, power supply of the electromagnet is cut off, the hook claw can swing to an unlocking state, at the moment, the linear driving mechanism and the lifting column can be disconnected, and ascending of the lifting column cannot be affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of general configuration of platforms including passenger protection equipment, and in particular relates to a lifting device and a clutch device thereof. Background Art

[0002] In order to prevent passengers waiting on the platform from crossing the safety line and to ensure the safety of passengers, it is necessary to configure a protection system at the edge of the platform. Based on the current open platform and taking into account the actual needs of high-speed railways, EMUs and other passenger trains, the existing technology has proposed a lifting platform protection system, which includes multiple lifting devices, each of which includes a fixed column and a lifting column. The lifting column can be raised and lowered relative to the fixed column within a set stroke. According to actual needs, multiple lifting devices can be installed at the edge of the platform at intervals along the length direction of the platform. A blocking rope or rope belt is connected between the lifting columns of two adjacent lifting devices. The lifting column can drive the barrier rope to rise and fall. When the lifting column is at the lowest position, the blocking rope is also at the lowest position, thereby blocking passengers. When the lifting column rises to the highest position, the blocking rope can also rise to the highest position, and passengers can get on and off the train normally.

[0003] Lifting equipment typically uses a single drive mechanism to propel the columns up and down. However, if this drive mechanism malfunctions, the columns can fail to rise properly, hindering the timely raising of the barrier ropes. High-speed trains and EMUs typically stop at platforms for only a short time, typically around two minutes. A malfunction of this type could prevent passengers from boarding or disembarking.

[0004] To address these issues, the applicant's patent application, CN221316122U, provides a lifting device equipped with an emergency drive mechanism. This device comprises a fixed column, a lifting column, and two lifting drive mechanisms. One of these is a main drive mechanism that outputs linear motion via reciprocating motion of an annular transmission element, while the other is a linear drive mechanism that directly outputs linear motion. The lifting column is equipped with a load-bearing member located along the ascending path of the linear drive mechanism's output end. Under normal circumstances, the linear drive mechanism is in a standby state. If the main drive mechanism malfunctions and cannot normally drive the lifting column upward, the linear drive mechanism's output end extends, pushing the lifting column to its highest position.

[0005] Furthermore, in order to enable the linear drive mechanism to complete the entire process of driving the lifting column to ascend and descend without interfering with the normal operation of the main drive mechanism, the above-mentioned patent further discloses a clutch device comprising a hook component, a lock tongue component, and an unlocking member. One of the hook component and the lock tongue component can be mounted on a load-bearing member (i.e., a passive member) on the lifting column, and the other can be mounted on the output end (i.e., an active member) of the linear drive mechanism. The hook component comprises a hook mounting seat and a hook swiveled on the hook mounting seat. The hook has an engaging surface, and the lock tongue has a hooking surface. During the swing stroke, the hook has a hooking position in which it is hooked and connected to the lock tongue (the hooking surface and the hooking surface are in contact), and a pushing-open position (i.e., an unlocking position) in which it is pushed open by the unlocking member. In a natural state, the hook is in the hooking position. When the output end of the linear drive mechanism descends, the lifting column can be driven downward. When it descends to the lowest position, the unlocking member pushes the hook to the pushing-open position, separating the hook and the lock tongue. In this way, after the main drive mechanism malfunction is repaired, the linear drive mechanism will not interfere with the normal operation of the main drive mechanism.

[0006] Since platforms are more convenient for power supply, electric cylinders or electric push rods are preferred for linear drive mechanisms. However, in extreme cases, if the main drive mechanism is damaged and the electric cylinder or electric push rod fails before driving the lifting column to its highest position or lowest position, and the output end cannot move normally (self-locking), the hook claw is naturally in the hook-locked position, and the hook claw and the lock tongue remain in a continuously hooked connection state. At this time, the lifting column will be locked in its position and cannot be manually unlocked, affecting the normal boarding and alighting of passengers. Utility Model Content

[0007] The purpose of the present invention is to provide a clutch device for a lifting device to solve the technical problem in the prior art that the lifting column may still get stuck in the extreme case of failure of the backup linear drive mechanism of the lifting device. The purpose of the present invention is also to provide a lifting device to solve the same technical problem.

[0008] To achieve the above-mentioned purpose, the technical solution of the clutch device of the lifting equipment provided by the present utility model is:

[0009] A clutch device for a lifting device includes a hook claw component and a lock tongue. The hook claw component includes a hook claw mounting seat and a hook claw swingably mounted on the hook claw mounting seat. One end of the hook claw is a hooking end for cooperating with the lock tongue hook lock. The hook claw has a hook lock state in which it is hooked and engaged with the lock tongue and an unlocked state separated from the lock tongue during the swing stroke. The hook claw component also includes an electromagnet mounted on the hook claw mounting seat. The electromagnet has a pull rod that can move back and forth in a straight line. When the electromagnet is energized, the pull rod is actuated and pulls the hook claw to swing to the hook lock state. When the electromagnet is de-energized, the pull rod is actuated and pushes the hook claw to swing to the unlocked state.

[0010] As a further improvement, the hook component further includes a connecting rod, one end of which is hinged to the pull rod and the other end is hinged to the end of the hook facing away from the hooking end, so as to transmit the movement of the pull rod through the connecting rod.

[0011] As a further improvement, the hook claw mounting seat includes a hook claw mounting plate, an electromagnet mounting plate and a connecting piece connected between the electromagnet mounting plate and the hook claw mounting plate. The hook claw is mounted on the hook claw mounting plate, and the hook claw mounting plate is provided with an avoidance opening to prevent the hook claw from swinging. The main body of the electromagnet is mounted on the side of the electromagnet mounting plate away from the hook claw mounting plate, and the pull rod passes through the electromagnet mounting plate and is hinged to the connecting rod.

[0012] As a further improvement, a connecting screw rod for connecting to a passive component of the lifting device is installed on the electromagnet mounting plate, wherein the connecting screw rod is provided with an external thread section at one end facing away from the electromagnet mounting plate.

[0013] As a further improvement, the end of the lock tongue facing the hook claw is defined as the front end, and the hooking end is provided with an embracing surface for embracing the rear part of the hook hanging surface of the lock tongue in the hook-locked state.

[0014] As a further improvement, a notch structure is provided in the middle of the side wall of the hooking end forming the embracing surface.

[0015] The present utility model is an improved invention, and its beneficial effects are as follows: when the clutch device is applied to a lifting device, consistent with the prior art, one of the hook component and the lock tongue can be installed at the telescopic output end of the linear drive mechanism, and the other can be installed on the lifting column to form a load-bearing component for cooperating with the telescopic output end to push and bear the load. When the hook and the lock tongue are in lock-lock cooperation, the linear drive mechanism can pull the lifting column down to a low position. Unlike the prior art, the swinging of the hook to switch between the locked and unlocked states is controlled by an electromagnet, and the action of the electromagnet pull rod can drive the hook to swing. In this way, in extreme cases, if the linear drive mechanism fails and gets stuck while pulling the lifting column down, the power supply to the electromagnet is cut off, and the hook can swing to the unlocked state. At this time, the connection between the linear drive mechanism and the lifting column can be released, which will not affect the lifting column from rising.

[0016] To achieve the above-mentioned purpose, the technical solution of the lifting equipment provided by the present utility model is:

[0017] A lifting device includes a fixed column, a lifting column, a linear drive mechanism and a clutch device, the clutch device includes a hook claw component and a lock tongue, one of the hook component and the lock tongue is connected to the output end of the linear drive mechanism, and the other is connected to a load-bearing component on the lifting column that is on the rising path of the output end of the linear drive mechanism, the hook claw component includes a hook claw mounting seat and a hook claw swingably mounted on the hook claw mounting seat, one end of the hook claw is a hooking end for cooperating with the lock tongue hook lock, and the hook claw has a hook lock state in which it is hooked and cooperates with the lock tongue and an unlocked state separated from the lock tongue during the swing stroke, the hook claw component also includes an electromagnet mounted on the hook claw mounting seat, the electromagnet has a pull rod that can move back and forth in a straight line, when the electromagnet is energized, the pull rod is actuated and pulls the hook claw to swing to the hook lock state, when the electromagnet is de-energized, the pull rod is actuated and pushes the hook claw to swing to the unlocked state.

[0018] As a further improvement, the hook component further includes a connecting rod, one end of which is hinged to the pull rod and the other end is hinged to the end of the hook facing away from the hooking end, so as to transmit the movement of the pull rod through the connecting rod.

[0019] As a further improvement, the hook claw mounting seat includes a hook claw mounting plate, an electromagnet mounting plate and a connecting piece connected between the electromagnet mounting plate and the hook claw mounting plate. The hook claw is mounted on the hook claw mounting plate, and the hook claw mounting plate is provided with an avoidance opening to prevent the hook claw from swinging. The main body of the electromagnet is mounted on the side of the electromagnet mounting plate away from the hook claw mounting plate, and the pull rod passes through the electromagnet mounting plate and is hinged to the connecting rod.

[0020] As a further improvement, a connecting screw is installed on the electromagnet mounting plate, wherein the connecting screw is provided with an external thread section at one end away from the electromagnet mounting plate, and is connected to the load-bearing component through the connecting screw.

[0021] As a further improvement, the end of the lock tongue facing the hook claw is defined as the front end, and the hooking end is provided with an embracing surface for embracing the rear part of the hook hanging surface of the lock tongue in the hook-locked state.

[0022] As a further improvement, a notch structure is provided in the middle of the side wall of the hooking end forming the embracing surface.

[0023] As a further improvement, the lifting device includes a control circuit, which controls the linear drive mechanism and the electromagnet to be energized or de-energized simultaneously during the descent process of the linear drive mechanism.

[0024] As a further improvement, the lifting device includes an electromagnet power supply circuit, and the electromagnet power supply circuit has a manual switch to facilitate control of power loss of the electromagnet.

[0025] The present utility model is an improved invention, and its beneficial effects are as follows: consistent with the prior art, one of the hook component and the lock tongue of the clutch device can be installed at the telescopic output end of the linear drive mechanism, and the other can be installed on the lifting column to form a load-bearing component for cooperating with the telescopic output end to push and bear the load. When the hook and the lock tongue are in lock-lock cooperation, the linear drive mechanism can pull the lifting column down to a low position. Unlike the prior art, the swinging of the hook to switch between the locked and unlocked states is controlled by an electromagnet, and the action of the electromagnet pull rod can drive the hook to swing. In this way, in extreme cases, if the linear drive mechanism fails and gets stuck while pulling the lifting column down, the power supply to the electromagnet is cut off, and the hook can swing to the unlocked state. At this time, the connection between the linear drive mechanism and the lifting column can be released, and the lifting column will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a hook component of a clutch device embodiment 1 of a lifting device in the present utility model (partial cross-section);

[0027] Figure 2 Schematic diagram of the lock tongue of the clutch device embodiment 1 of the lifting equipment in the present invention (installed on the electric cylinder);

[0028] Figure 3 Schematic diagram of a hook component of a clutch device embodiment 2 of a lifting device in the present utility model (partial cross-section);

[0029] Figure 4 for Figure 3 Top view of the middle hook end position.

[0030] Description of reference numerals:

[0031] 1. Electromagnet; 2. Connecting screw; 3. Pull rod; 4. Connecting piece; 5. Connecting rod; 6. Hook mounting plate; 7. Hook; 8. Electromagnet mounting plate; 9. Connecting accessories; 10. Lock tongue; 11. Electric cylinder; 12. Connecting nut; 100. Load-bearing component; 101. Hook surface; 701. Hooking end; 702. Embracing surface; 703. Notch structure. DETAILED DESCRIPTION

[0032] To prevent the lifting column from getting stuck due to damage to the linear drive mechanism (electric cylinder) in extreme situations, the basic technical concept of this utility model is to use an electromagnet with a pull rod to drive the hook to swing, switching the hook between a locked and unlocked state. When the electromagnet loses power, the hook can swing to the unlocked state. In this way, in extreme situations, such as when the main drive mechanism of the lifting device is damaged and the linear drive mechanism fails while pulling the lifting column downward, the power supply to the electromagnet can be cut off, the hook is unlocked, and the connection between the linear drive mechanism and the lifting column is released. In this case, if a train stops at a station, the lifting column can be raised manually or by switching to other emergency drive mechanisms on the lifting device, ensuring normal boarding and alighting of waiting passengers. The utility model is further described in detail below with reference to the following embodiments.

[0033] Specific embodiment 1 of the clutch device of the lifting equipment provided by the utility model:

[0034] The clutch device of the lifting equipment provided in this embodiment includes the following Figure 1 The hook components shown and Figure 2 The illustrated lock tongue 10 is consistent with the lifting device comprising a fixed column, a lifting column, and a linear drive mechanism disclosed in the applicant's patent publication number CN221316122U, in that the output end of the linear drive mechanism is operable to drive the lifting column upward. In other words, the lifting column is provided with a load-bearing component 100 that is located in the upward path of the linear drive mechanism's output end. The hook component can be mounted on the load-bearing component 100 of the lifting column, and the lock tongue 10 can be mounted on the output end of the linear drive mechanism (i.e., the electric cylinder 11 or electric push rod). The output end of the linear drive mechanism is the active component, and the load-bearing component on the lifting column is the passive component. Of course, in other embodiments, the positions of the hook component and the lock tongue 10 can be interchanged, with the hook component mounted on the output end of the linear drive mechanism and the hook component mounted on the lifting column.

[0035] like Figure 1 and Figure 2 As shown, the hooking component also includes a hook claw mounting seat and a hook claw 7 swingably mounted on the hook claw mounting seat. One end of the hook claw 7 is a hooking end 701 for hooking and locking with the lock tongue 10. The hook claw 7 has a hooking state for hooking and locking with the lock tongue 10 and an unlocking state separated from the lock tongue 10 during the swinging stroke. Figure 1 The illustrated state is unlocked. Specifically, in the hook-locked state, the engaging surface of the hook end engages with the hook surface 101 of the lock tongue 10. The downward movement of the output end of the electric cylinder 11 pulls the hook mounting base downward via the hook claw 7, thereby lowering the lifting column. The number and mounting method of the hook claws 7 are consistent with those in Patent Publication No. CN221316122U and will not be described in detail here.

[0036] Different from the prior art, in this embodiment, an electromagnet 1 is used to control the swing state of the hook 7. Specifically, Figure 1 As shown, the hook claw component also includes an electromagnet 1 installed on the hook claw mounting seat. The electromagnet 1 is equipped with a pull rod 3 that can move linearly reciprocatingly. Its specific structure is the existing technology. Here we only briefly introduce the principle of the action of the pull rod 3. After the electromagnet 1 is energized, the magnetic force generated by the coil can attract the moving iron core and drive the pull rod 3 to move upward. After the electromagnet 1 loses power, the magnetic force disappears and the spring inside the electromagnet 1 pushes the pull rod 3 to move downward. In order to convert the linear action of the pull rod 3 into the swinging action of the hook claw 7, the hook claw component also includes a connecting rod 5. One end of the connecting rod 5 is hinged to the pull rod 3, and the other end is hinged to the end of the hook claw 7 that is away from the hook end 701. It should be noted that the articulation of the connecting rod 5 and the pull rod 3 can be direct articulation or indirect articulation. The so-called direct articulation refers to the method of directly installing the hinge shaft on the pull rod 3. The so-called indirect articulation refers to the connecting rod 5 being hinged by Figure 1 The connecting accessory 9 is hinged to the pull rod 3 in the manner shown, the hinge shaft is installed on the connecting accessory 9, and the connecting accessory 9 and the connecting rod 5 are fixedly connected, for example, by welding, wherein the connecting accessory 9 can play the role of equivalently extending the pull rod 3.

[0037] like Figure 1 As shown, when the electromagnet 1 is energized, the pull rod 3 moves upward, and the hook end 701 of the hook claw 7 can be pulled inward to the hook locked state through the connecting rod 5. When the electromagnet 1 is de-energized, the pull rod 3 moves downward, and the hook end 701 can be pushed outward to the unlocked state through the connecting rod 5.

[0038] Analysis of the above process demonstrates that, for a lifting device employing the clutch device of this embodiment, hook 7 can still lock normally under the drive of electromagnet 1, functioning as a transmission of power output from electric cylinder 11. However, in the event of an extreme situation, hook 7 can be unlocked simply by de-energizing electromagnet 1. In this case, a failure of electric cylinder 11 will not hinder the lifting column from ascending or descending. Depending on the actual situation at the platform, staff can manually raise the lifting column or utilize other emergency backup mechanisms configured on the lifting device, allowing passengers to board and alight the train normally. It should be noted that when the hook 7 swings to the locked position, it is nearly vertical and nearly parallel to the pull rod 3, resulting in a relatively stable overall structure. The magnetic force of electromagnet 1 does not need to be excessive (oversized), but rather sufficient.

[0039] It should be noted that those skilled in the art should understand that in other embodiments, the connecting rod 5 may not be configured, as long as the transmission connection between the hook claw 7 and the pull rod 3 can be achieved. For example, one end of the hook claw 7 may be directly hinged to the pull rod 3. Alternatively, a long hole extending along the length direction of the hook claw 7 is provided at one end of the hook claw 7, a sliding pin that can slide in the long hole is provided at one end of the pull rod 3, and a stop structure that cooperates with the sliding pin is provided inside the long hole or at the hole mouth. When the pull rod 3 moves downward, the sliding pin can slide in the long hole, thereby pushing the hook claw 7 to an unlocked state. When the pull rod 3 moves upward, the sliding pin slides in the long hole until it cooperates with the stop structure, and the pull rod 3 continues to move upward to pull the hook claw to swing to the hook lock state.

[0040] It should also be noted that there are multiple ways to control the de-energization of electromagnet 1 in a lifting device. As a preferred embodiment, the control circuit of the lifting device is configured to simultaneously energize or de-energize the linear drive mechanism and electromagnet 1 during the descent of the linear drive mechanism (output end). Specifically, electromagnet 1 can be connected in parallel to the linear drive mechanism's circuit. When the linear drive mechanism is energized and begins to descend, electromagnet 1 is energized and drives the hook to a locked state. If the linear drive mechanism malfunctions, the linear drive mechanism is de-energized, and electromagnet 1 automatically de-energizes, causing the hook to swing to an unlocked state.

[0041] As another embodiment, of course, the lifting device can be equipped with a separate electromagnet power supply circuit for the electromagnet 1. In this embodiment, preferably, a manual switch (such as a button, knob, or pull switch) can be configured for the electromagnet power supply circuit. In this way, in an emergency, the passenger attendant on the platform can manually operate the manual switch to cut off the electromagnet power supply circuit, which is more convenient and less prone to errors.

[0042] As a preferred embodiment with higher strength and more compactness, Figure 1 As shown, the hook mounting base includes a hook mounting plate 6, an electromagnet mounting plate 8, and a connector 4 connected between the electromagnet mounting plate 8 and the hook mounting plate 6. The connector 4 can be a rod-shaped or plate-shaped structure. The hook 7 is mounted on the hook mounting plate 6. To prevent the hook mounting plate 6 from interfering with the normal swing of the hook 7, the hook mounting plate 6 is provided with an opening to allow the hook 7 to swing. The electromagnet 1 is mounted on the electromagnet mounting plate 8. Specifically, the main body of the electromagnet 1 is mounted on the side of the electromagnet mounting plate 8 facing away from the hook mounting plate 6. The pull rod 3 passes through the electromagnet mounting plate 8 and is hingedly connected to the connecting rod 5, with the hinged portion located on the inner side of the connector 4. This type of hook mounting base has a compact structure and can also serve as a supporting member. When the output end of the electric cylinder 11 pushes upward, it can directly press against the hook mounting plate 6 and transmit power to the lifting column.

[0043] Furthermore, a connecting screw 2 is mounted on the electromagnet mounting plate 8. The connecting screw 2 can be used as a connector to connect to the load-bearing component 100 (i.e., the passive component) on the lifting column. The screw head of the connecting screw 2 can be welded to the electromagnet mounting plate 8, and the external thread section is located at the end of the connecting screw 2 that is away from the electromagnet mounting plate 8, such as Figure 1 As shown, during installation, the external thread section can be directly inserted into the through hole in the load-bearing component 100 and connected using a connecting nut 12, wherein two connecting nuts 12 are respectively located on the upper and lower sides of the load-bearing component 100. This is convenient and efficient, and also easy to disassemble. In addition, the connecting nut 12 and the connecting screw 2 also form a screw nut structure. Twisting the connecting nut 12 can drive the connecting screw 2 up and down, thereby adjusting the height of the hook claw mounting seat to ensure that the hook claw is in the optimal position for hooking and engaging with the lock tongue. Of course, in other embodiments, it is not ruled out that the electromagnet mounting plate 8 can be directly welded to the load-bearing component.

[0044] Specific embodiment 2 of the clutch device of the lifting equipment provided by the utility model:

[0045] like Figure 3 and Figure 4 As shown, the purpose of this embodiment is to provide a hook claw 7 structure with a more reliable hook lock with the lock tongue 10, wherein the connection relationship between the hook claw 7 and the electromagnet 1 is the same as that of the embodiment 1 and will not be described in detail here. The difference from the embodiment 1 is that the hook end 701 of the hook claw 7 is provided with an embracing surface 702. When the hook claw 7 swings to the hook lock state, as shown in FIG. Figure 2 The portion of the lock tongue 10 located behind the hook surface 101 (defined as the front end of the lock tongue 10 facing the hook 7) is surrounded by an embracing surface 702. This increases the contact area between the hook 7 and the lock tongue 10, thereby improving the reliability of the hook-locking fit between the hook 7 and the lock tongue 10. Specifically, the shape of the embracing surface 702 matches that of the lock tongue 10. If the portion of the lock tongue 10 located behind the hook surface 101 is cylindrical, the embracing surface 702 also corresponds to an arcuate surface.

[0046] Furthermore, a notch structure 703 is provided in the middle of the side wall of the hook end 701 that forms the embracing surface 702. By providing the notch structure 703, this embodiment allows the hook end 701 to form an embracing clamping structure for the portion of the lock tongue 10 located behind the hook surface 101. Even in the event of installation errors, when the two embracing surfaces 702 contact the corresponding positions of the lock tongue 10, the positions can be adaptively adjusted, and there is sufficient contact area between the hook end and the lock tongue 10.

[0047] Specific embodiments of the lifting device in the utility model:

[0048] The lifting device in this embodiment is different from the prior art in that it uses the clutch device described in Example 1 or 2 of the clutch device of the above-mentioned lifting device, which will not be described in detail here.

[0049] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A clutch device for a lifting device, comprising a hook component and a lock tongue, wherein the hook component comprises a hook mounting seat and a hook swiveled on the hook mounting seat, wherein one end of the hook is a hooking end for engaging with the lock tongue, and the hook has a hooking state in which it engages with the lock tongue and an unlocking state in which it is separated from the lock tongue during its swinging stroke, wherein: The hook claw component also includes an electromagnet installed on the hook claw mounting seat, and the electromagnet has a pull rod that can move back and forth in a straight line. When the electromagnet is energized, the pull rod moves and pulls the hook claw to swing to the hook locked state. When the electromagnet loses power, the pull rod moves and pushes the hook claw to swing to the unlocked state.

2. The clutch device of the lifting equipment according to claim 1, characterized in that: The hook component also includes a connecting rod, one end of which is hinged to the pull rod, and the other end is hinged to the end of the hook away from the hooking end, so as to transmit the movement of the pull rod through the connecting rod.

3. The clutch device of the lifting equipment according to claim 2, characterized in that: The hook claw mounting seat includes a hook claw mounting plate, an electromagnet mounting plate and a connecting piece connected between the electromagnet mounting plate and the hook claw mounting plate. The hook claw is mounted on the hook claw mounting plate, and the hook claw mounting plate is provided with an avoidance opening to prevent the hook claw from swinging. The main body of the electromagnet is mounted on the side of the electromagnet mounting plate away from the hook claw mounting plate, and the pull rod passes through the electromagnet mounting plate and is hinged to the connecting rod.

4. The clutch device of the lifting equipment according to claim 3, characterized in that: A connecting screw rod for connecting with a passive component of a lifting device is installed on the electromagnet mounting plate, wherein the connecting screw rod is provided with an external thread section at one end away from the electromagnet mounting plate.

5. The clutch device of the lifting equipment according to any one of claims 1 to 4, characterized in that: The end of the lock tongue facing the hook claw is defined as the front end, and the hooking end is provided with an embracing surface for embracing the rear side of the hook hanging surface of the lock tongue in the hook locking state.

6. The clutch device of the lifting equipment according to claim 5, characterized in that: A notch structure is provided in the middle of the side wall of the hooking end forming the embracing surface.

7. A lifting device, comprising a fixed column, a lifting column, a linear drive mechanism and a clutch device, the clutch device comprising a hook claw component and a lock tongue, one of the hook claw component and the lock tongue being connected to the output end of the linear drive mechanism, and the other being connected to a load-bearing component on the lifting column that is located on the rising path of the output end of the linear drive mechanism, the hook claw component comprising a hook claw mounting seat and a hook claw swingably mounted on the hook claw mounting seat, one end of the hook claw being a hooking end for engaging with the lock tongue hook lock, the hook claw having a hooking state of engaging with the lock tongue and an unlocking state of separating from the lock tongue during the swing stroke, wherein: The hook claw component also includes an electromagnet installed on the hook claw mounting seat, and the electromagnet has a pull rod that can move back and forth in a straight line. When the electromagnet is energized, the pull rod moves and pulls the hook claw to swing to the hook locked state. When the electromagnet loses power, the pull rod moves and pushes the hook claw to swing to the unlocked state.

8. The lifting device according to claim 7, characterized in that: The hook component also includes a connecting rod, one end of which is hinged to the pull rod, and the other end is hinged to the end of the hook away from the hooking end, so as to transmit the movement of the pull rod through the connecting rod.

9. The lifting device according to claim 8, characterized in that: The hook claw mounting seat includes a hook claw mounting plate, an electromagnet mounting plate and a connecting piece connected between the electromagnet mounting plate and the hook claw mounting plate. The hook claw is mounted on the hook claw mounting plate, and the hook claw mounting plate is provided with an avoidance opening to prevent the hook claw from swinging. The main body of the electromagnet is mounted on the side of the electromagnet mounting plate away from the hook claw mounting plate, and the pull rod passes through the electromagnet mounting plate and is hinged to the connecting rod.

10. The lifting device according to claim 9, characterized in that: A connecting screw is installed on the electromagnet mounting plate, wherein the connecting screw is provided with an external thread section at one end away from the electromagnet mounting plate and is connected to the load-bearing component through the connecting screw.

11. The lifting device according to any one of claims 7 to 10, characterized in that: The end of the lock tongue facing the hook claw is defined as the front end, and the hooking end is provided with an embracing surface for embracing the rear side of the hook hanging surface of the lock tongue in the hook locking state.

12. The lifting device according to claim 11, characterized in that: A notch structure is provided in the middle of the side wall of the hooking end forming the embracing surface.

13. The lifting device according to any one of claims 7 to 10, characterized in that: The lifting device comprises a control circuit, which controls the linear drive mechanism and the electromagnet to be energized or de-energized simultaneously during the descending process of the linear drive mechanism.

14. The lifting device according to any one of claims 7 to 10, characterized in that: The lifting device comprises an electromagnet power supply circuit, wherein the electromagnet power supply circuit is provided with a manual switch so as to control the electromagnet to lose power.

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